STRONG QUAKES CONTINUE IN FIJI

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 20, 2018

 

The strongest seismicity in the world today continued to occur in the southwest Pacific region. Earthquakes of M 5.8 and 5.9 occurred east of Suva Fiji in this continuing series which has followed events including an M 8.2 and M 7.8 on August 19 and September 6 in Fiji.  Forecasts 119933 and 119934 had expected today's activity could be large around September 18.

 

O: 21SEP2018 03:41:41  17.8S  180.0W Mw=5.9  EMSC   FIJI REGION                   

O: 21SEP2018 03:41:41  17.9S  179.9W mw=5.9  ANSS   E of Suva Fiji

O: 21SEP2018 03:40:39  17.9S  180.0E mw=5.8  ANSS   E of Suva Fiji

O: 21SEP2018 03:40:39  17.9S  180.0E Mw=5.8  EMSC   FIJI                         

O: 21SEP2018 06:49:22  18.0S  178.3W mb=4.2  EMSC   FIJI REGION                  

O: 20SEP2018 15:50:08  18.1S  178.4W mb=4.2  EMSC   FIJI REGION                  

P: 18SEP2018 119933    17.0S  179.0W 4.0-6.1 AAAAA  Tonga Islands              

P: 18SEP2018 119934    18.0S  180.0W 4.0-5.6 AAAAA  Tonga Islands              

 

An earthquake of M 5.4 in the area off the coast of Chiapas, Mexico was lightly felt in that area today. This may be related to stresses from Hurricane Florence while unloaded force over the area last week. Hurricanes in September are often followed by enhanced seismicity in eastern Mexico and Guatemala. The last  earthquake of M>=5.4 in Chiapas, Mexico within about 100 km of today's epicenter was an M 5.5 on April 11, 2018 and prior to that an M 5.4 on October 14, 2017. Today's event is an aftershock of the M 8.1 quake which hit the region on September 8, 2017 – the strongest within about 100 km of the mainshock since September, 2017. Forecasts 119738 and 119739 had expected today's Chiapas activity was likely around September 22.

 

O: 20SEP2018 17:13:56  15.4N   94.7W ML=4.2  EMSC   OFFSHORE OAXACA, MEXICO      

O: 20SEP2018 09:23:13  14.3N   93.9W ML=4.1  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 20SEP2018 20:51:13  14.3N   94.0W ML=4.1  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 20SEP2018 09:59:17  14.4N   93.9W ML=4.2  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 20SEP2018 13:12:23  14.4N   94.0W ML=4.1  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 20SEP2018 09:57:42  14.5N   94.0W ML=4.4  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 20SEP2018 09:21:18  14.7N   93.8W Mw=5.4  EMSC   OFF COAST OF CHIAPAS, MEXICO

P: 22SEP2018 119738    15.0N   93.0W 3.5-5.1 AAAAA  Chiapas, Mexico            

P: 22SEP2018 119739    16.0N   94.0W 3.5-5.1 AAAAA  Chiapas, Mexico            

 

An earthquake of M 3.4 was widely felt in eastern Los Angeles, California today. NEIC reported it was felt with intensity II-III in San Bernardino, Grand Terrace, Colton, Loma Linda, Rialto, Highland, Redlands, Fontana, Moreno Valley, Riverside, Running Springs, Rancho Cucamonga, Moreno Valley, Ontario, Yucaipa, Upland, Hesperia, Corona, Perris, Beaumont, Chino Hills, Victorville, Lake Elsinore, Sun City, Banning, San Jacinto, Menifee, and in general within about 75 km of the epicenter. This is the largest earthquake in eastern Los Angeles within about 50 km of this epicenter since an M 4.4 on August 29, 2018 about 50 km west of today's epicenter. Forecast 119818 had expected today's event was likely in this area around September 20.

 

O: 20SEP2018 12:44:34  34.1N  117.3W ML=3.4  EMSC   GREATER LOS ANGELES AREA, CALI

P: 20SEP2018 119818    33.7N  117.5W 2.5-4.8 AAAAA  So. California             

 

A moderately large quake of M 5.4 also occurred in the Northern Mariana Islands today. This continues moderate quakes in the region which included an M 6.4 on August 28 and  an M 5.7 on July 29. The most recent such event in the area was an M 5.3 on September 15 and September 3, 2018 both within about 100 km of today's epicenter. Most of these occurred shortly after typhoons passed through the area, Today's event of M 5.4 occurred as Tropical Storm 28W passed over this epicenter. Forecast 119752 expected this activity was likely around September 16.

 

NEIC reported this earthquake of M 5.4 in the Central Mariana Islands was felt with intensity II-III in the area(s) of Tinian, MP, Maraianas.

 

O: 20SEP2018 04:55:35  17.0N  145.7E mb=5.4  EMSC   ANATAHAN REG, N. MARIANA ISLAN

P: 16SEP2018 119752    18.0N  145.0E 4.0-5.4 BAAAA  No. Marianas               

 

Seismicity in the aftershock zone of the M 6.4 in Northern Alaska of August 12, 2018 continued today. The strongest event in the U.S. or Canada today was an M 3.8 in the northern Alaska aftershocks zone. This follows an M 4.9 and 3.9 in the area in the past two days. Forecast 119911 had expected this activity was likely in the area around September 18.

 

O: 21SEP2018 02:19:38  69.5N  144.1W Ml=3.0  EMSC   NORTHERN ALASKA

O: 20SEP2018 09:27:59  69.5N  144.4W ML=3.8  EMSC   NORTHERN ALASKA

O: 20SEP2018 13:55:52  69.2N  146.7W ML=3.0  EMSC   NORTHERN ALASKA              

P: 18SEP2018 119911    69.4N  144.8W 3.0-4.9 AAAAA  Northern Alaska            

 

CARLSBERG RIDGE, SOCOTRA ADD SEISMICITY TO CONTINUING SOLOMON IS SWARM

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 19, 2018

 

The strongest earthquake in the world today continued activity in the Solomon Islands where an M 5.8 occurred yesterday. The strongest quakes in the area today were M 5.7 and 5.1. This activity joined moderate to moderately large events in the Gulf of Aden, Socotra and the Carlsberg Ridge in the Iranian subduction zone area. None of these events were reported felt but may indicate a stronger quake is in the offing in the area.

 

The earthquakes in the Solomon Islands had been anticipated in forecast 119728 to occur around September 17 within about 25 km of today's epicenter.

 

O: 20SEP2018 06:45:01   8.9S  158.3E mb=5.1  EMSC   SOLOMON ISLANDS               

O: 20SEP2018 06:13:58   9.0S  158.2E mb=4.9  EMSC   SOLOMON ISLANDS              

O: 20SEP2018 05:47:36   9.0S  158.3E Mw=5.7  EMSC   SOLOMON ISLANDS              

P: 17SEP2018 119728     9.0S  158.0E 4.0-5.6 BAAAA  Solomon Islands             

 

The events of M 5.4 and 4.6 in the Carlsberg Ridge and Socotra regions occurred south of the expected activity in forecast 119735 but within two days of the expected time. The last earthquake of M>=5.4 in the Carlsberg Ridge region within about 250 km of this epicenter was an M 5.4 on February 10, 2015.

 

O: 19SEP2018 08:53:13  10.4N   56.9E mb=5.4  EMSC   CARLSBERG RIDGE              

O: 20SEP2018 04:10:02  11.2N   56.7E mb=4.6  EMSC   SOCOTRA REGION               

P: 18SEP2018 119735    15.0N   56.0E 3.5-5.0 ACAAA  Arabian Sea                

 

The event in the Gulf of Aden had been expected within about 50 km of the epicenter to occur in Mid-September in forecast 119744.

 

O: 19SEP2018 09:14:53  13.2N   50.6E mb=4.4  EMSC   GULF OF ADEN                  

P: 15SEP2018 119744    13.0N   51.0E 3.5-5.0 BAAAA  Gulf of Aden               

 

A moderately large quake of M 5.4 also occurred in the Northern Mariana Islands today. This continues moderate quakes in the region which included an M 6.4 on August 28 and  an M 5.7 on July 29. The most recent such event in the area was an M 5.3 on September 15 and September 3, 2018 both within about 100 km of today's epicenter. Most of these occurred shortly after typhoons passed through the area, Forecast 119752 expected this activity was likely around September 16.

 

NEIC reported this earthquake of M 5.4 in the Central Mariana Islands was felt with intensity II-III in the area(s) of Tinian, MP, Maraianas.

 

O: 20SEP2018 04:55:35  17.0N  145.7E mb=5.4  EMSC   ANATAHAN REG, N. MARIANA ISLAN

P: 16SEP2018 119752    18.0N  145.0E 4.0-5.4 BAAAA  No. Marianas               

 

The strongest activity in the U.S. or Canada today continued in the region of Northern Alaska where an M 4.9, the strongest since August 12 mainshock occurred yesterday. Today's largest event was M 3.9. Forecast 119911 had expected this enhanced activity was likely around September 18.

 

 

O: 19SEP2018 22:12:42  69.5N  144.3W ML=3.9  EMSC   NORTHERN ALASKA              

O: 19SEP2018 20:09:39  69.5N  144.4W Ml=3.1  EMSC   NORTHERN ALASKA              

O: 19SEP2018 15:40:49  69.6N  145.2W ML=3.0  EMSC   NORTHERN ALASKA              

P: 18SEP2018 119911    69.4N  144.8W 3.0-4.9 AAAAA  Northern Alaska            

 

Seismicity also continued in the region of Antofagasta, Chile and Jujuy, Argentina.  This region is at the antipode of the area where Typhoon Mangkhut made landfall over the past several days. Energy from this storm may have focused at the antipode and helped trigger this Southern American seismicity. Forecast 119937 expected this activity was likely around September 17. The largest of these events today was an M 5.0 off the coast of Tarapaca, Chile. Similar earthquakes have most recently occurred in the Tarapac area on August 4, 2018 and August 14, 2018 with M 5.1-5.2. Forecast 119947 had expected this event in Tarapaca was likely around September 19.  .

 

CNS reported this earthquake was felt with intensity V in  Arica at Cuya; IV at Arica and Codpa and III in Pocon Chile; Tarapaca with IV in Alto Hospicio, Camina, Huara, Iquique, La Tirana, Pozo Almonte, and III in Mamina, Pica, and Pisagua, Chile. NEIC reported this earthquake of M 5.0 in Tarapaca, Chile was felt with intensity V in Iquique, Tarapaca and II-III in the area(s) of Arica, Chile.

 

O: 19SEP2018 13:42:02  21.1S   68.5W ML=4.1  EMSC   ANTOFAGASTA, CHILE           

O: 19SEP2018 14:02:18  22.4S   66.1W mb=4.5  EMSC   JUJUY, ARGENTINA             

P: 17SEP2018 119937    22.0S   68.0W 4.0-5.8 AABAA  Argentina                  

 

O: 19SEP2018 18:42:20  19.6S   70.3W Mw=5.0  EMSC   OFFSHORE TARAPACA, CHILE     

O: 19SEP2018 18:42     19.5S   70.4W mb=5.0  GUC    Arica at Cuya; IV at Arica and

P: 19SEP2018 119947    20.0S   69.0W 4.0-5.4 AAAAA  So. Peru/Bolivia           

 

 

 

MODERATELY STRONG QUAKE IN SOUTHERN SOLOMON ISLANDS

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 18, 2018

 

A moderately strong earthquake of M 5.8 hit the Solomon Islands today. NEIC reported it was felt with intensity VI in Gizo, Western Solomon Islands. This earthquake is the strongest in the southern Solomon Islands since an M 7.0 on November 18, 2015. Forecast 119728 had expected this event was likely in the Solomon Islands around September 18. This earthquake is located about 10 degrees south of the geomagnetic equator and may have been promoted by the past geomagnetic storm as noted in previous issues of this summary:

 

"This storm is likely to enhance seismicity at 10-15 degrees from the geomagnetic equator during the period September 17-18 and at high latitudes." (September 16-18. 2018)

 

O: 18SEP2018 11:57:51   8.3S  157.2E Mw=5.8  EMSC   SOLOMON ISLANDS              

P: 18SEP2018 119728     7.0S  156.0E 4.0-5.5 ABAAA  Solomon Islands            

 

The strongest earthquake in the U.S. or Canada today occurred in the aftershock region of Northern Alaska with M 4.9. It may have been felt in Fairbanks lightly. No earthquakes of M>=4.9 in this aftershock zone have occurred since the mainshocks of M 6.4 and 6.1 on August 12, 2018. Forecast 119911 had expected today's event within about 25 km of the epicenter was likely around September 18.

 

O: 18SEP2018 23:10:14  69.6N  144.2W ML=3.0  EMSC   NORTHERN ALASKA              

O: 18SEP2018 13:30:38  69.6N  144.2W Ml=3.0  EMSC   NORTHERN ALASKA              

O: 18SEP2018 12:41:01  69.6N  144.9W mb=4.9  EMSC   NORTHERN ALASKA              

P: 18SEP2018 119911    69.4N  144.8W 3.0-4.9 AAAAA  Northern Alaska            

 

An earthquake of M 4.4 also occurred in the Aleutian Islands today in the Near Islands region of Alaska. It was not reported felt in this remote area. This is the third largest event in the Near Islands in the past year - following quakes of M 4.9 on May 9, 2018 and M 4.6 on July 10, 2018. Forecast 119897 had expected this event was likely within about 75 km of this epicenter around September 17.

 

O: 18SEP2018 19:07:11  51.5N  174.3E mb=4.4  EMSC   NEAR ISLANDS, ALEUTIAN ISLANDS

P: 17SEP2018 119897    52.0N  175.0E 4.0-6.0 AAAAA  Rat Islands                

 

STRONG EARTHQUAKE IN SOUTHWEST INDIAN RIDGE

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 17, 2018

 

The strongest earthquake in the world today was an M 6.0 in the Southwest Indian Ridge. It was not felt in this remote area. The last earthquake of M>=6 within about 400 km of this epicenter occurred on January 11, 2004 with M 6.2 about 300 km east of today's event and was the only such event in the area in at least 30 years Forecast 119959 had expected a moderately large quake in the area around September 17. The antipode of this epicenter is located at 37.8N 130W far off the coast of San Francisco, California. Some antipodal triggering in that area is possible but not likely at moderate magnitude levels.

 

O: 18SEP2018 07:27:40  37.8S   49.8E Mw=6.0  EMSC   SOUTHWEST INDIAN RIDGE       

P: 17SEP2018 119959    34.0S   56.0E 4.0-5.7 ACCAA  So. Indian Ocean           

 

The remnants of Hurricane Florence continued through the northeastern U.S. today. Some minor seismicity was associated with this storm in New Jersey (M 1.2) and east of Nova Scotia, Canada (M 3.3). This is typical seismicity associated with strong storm systems in the area. The event in New Jersey is the strongest in that State in nearly a year and occurred about 100 km south of two events in late 2017 - an M 1.0 on September 30 and November 8, 2017 (M 1.4). 

 

O: 17SEP2018 14:21:38  39.7N   74.6W ml=1.2  ANSS   Elwood New Jersey            

P: 18SEP2018 119858    40.0N   76.0W 2.0-3.9 AAAAA  New York State             

 

O: 16SEP2018 00:30:02  43.3N   58.1W ML=3.3  NRCA  332 km SE from Louisbourg     

 

The strongest earthquake in the U. S. or Canada today was an M 3.8 in Southern Alaska. NEIC reported this earthquake of M 3.8 in Southern Alaska was felt with intensity II-III in the area(s) of Alaska at Soldotna and Anchorage. The last earthquake within about 100 km of this epicenter with M>=3.8 was an M 4.3 on July 13, 2018. Forecast 119904 had expected today's event within about 50 km was likely around September 16.

 

O: 17SEP2018 12:35:09  59.7N  153.2W ML=3.8  EMSC   SOUTHERN ALASKA              

P: 16SEP2018 119904    60.1N  153.4W 3.2-5.1 AAAAA  Central Alaska             

 

STRONG DEEP FOCUS FIJI QUAKE EXPANDS ACTIVITY

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 16, 2018

 

The strongest earthquake in the world today was an M 6.5 in southern Fiji. This earthquake occurred at a deep focus near 600 km and was not reported felt in the epicentral area. This continues a series of strong to major earthquakes in the

Fiji area which began in late August and has continued with events of M 8.2, M 7.8 and M 6.5. Most of the larger quakes in this series have occurred with very deep focus. This expands the activated region of Fiji to the south. The last earthquake with M>=6.5 within about 400 km of this epicenter was an M 6.5 on September 26, 2017 and prior to that an M 6.6 on May 4, 2014. This epicenter is located at 103 degrees from the M 7.1 in Brazil of August 24, 2018 and was probably promoted by concentrated energy from that source. Areas at 103 degrees from large earthquakes often show strong activation following those events.

 

O: 17SEP2018 00:08:23  25.3S  178.5E mb=4.7  EMSC   SOUTH OF FIJI ISLANDS        

O: 16SEP2018 21:11:51  25.5S  178.2E Mw=6.5  EMSC   SOUTH OF FIJI ISLANDS        

P: 16SEP2018 119949    25.0S  179.0W 4.0-5.4 AABAA  Tonga Islands              

P: 17SEP2018 119949    24.0S  179.0E 4.0-5.5 ABAAA  Tonga/Fiji                  

 

 

 

The largest earthquake in the U.S. or Canada today was an M 4.5 aftershock in the Gulf of Alaska. The last shock in the Gulf of Alaska aftershocks zone of M 7.9 on January 23, 2018 with M>=4.5 occurred on August 25, 2018 with M 4.5.

Forecast 119619 had expected a moderate earthquake in the Gulf of Alaska was likely in mid-September.

 

O: 16SEP2018 21:30:29  56.3N  149.0W ML=4.5  ANSS   GULF OF ALASKA               

O: 16SEP2018 21:30:29  56.3N  149.0W ML=4.1  EMSC   GULF OF ALASKA               

O: 16SEP2018 07:22:15  56.8N  148.6W Ml=3.1  EMSC   GULF OF ALASKA               

P:  7SEP2018 119619    55.0N  148.0W 3.0-4.7 CBAAA  Gulf of Alaska             

 

An earthquake of M 4.9 shook regions of northern Chile and southern Peru today. The epicenter was in the Tarapaca area of Chile. This epicenter is at the antipode of Typhoon Mangkhut which continued to trigger deadly landslides in Laos and China today. This summary had noted this antipodal relation in the previous summary as:

 

"This epicenter is near the antipode where Typhoon Mangkhut wrecked considerable destruction in the Philippines. It is currently located very near the antipode of Southern Peru." (September 15-16, 2018)

 

and

 

"Other areas near the antipode could still see increased seismicity including Tarapaca, Chile at 20S 70W in the next several days." (September 15-16, 2018)

 

CSN reported this earthquake was felt with intensity IV in  Tarapaca at Pozo Almonte; III Alto Hospicio, Iquique, Pica and II Pisagua and in Arica with intensity III, Chile. NEIC reported this earthquake of M 4.9 in Tarapaca, Chile was felt with intensity V in the area(s) of Iquique, Tarapaca, Chile.

Forecasts 119673 and 119947 had expected this activity in mid-September.

 

O: 16SEP2018 13:32:25  20.4S   70.0W mb=4.9  EMSC   TARAPACA, CHILE              

O: 16SEP2018 13:32     20.4S   69.9W mb=4.2  GUC    Tarapaca at Pozo Almonte; III

P: 12SEP2018 119673    20.0S   71.0W 4.0-5.8 BAAAA  So. Peru/Bolivia           

P: 19SEP2018 119947    20.0S   69.0W 4.0-5.4 BAAAA  So. Peru/Bolivia           

 

QUAKES IN AUSTRALIA; PERU ANTIPODAL TO FLORENCE; MANGKHUT

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 15, 2018

 

Moderate earthquakes of M 5.3 and M 5.4 hit the regions of Western Australia and Peru today. These epicenters are near the antipodes of the major meteorological storms - Hurricane Florence of the North Atlantic and Super-Typhoon Mangkhut in Asia. When major energy events, such as great earthquakes, Hurricanes and Typhoons and meteor impacts occur, much of the energy is focused at the antipode because the earthquake is spherical and the energy converges at the antipode. This can often trigger strong enhances in seismicity near the antipode of major surface events.

 

A moderate earthquake of M 5.3 shook the region of south-western Australia today. NEIC reported it was felt with intensity IV in Western Australia at Albany and II-III in Collie, Australind, Bunbury, Busselton, Mandurah Kwinana, Perth and Esperance. The quake occurred within minutes of local solar noon and was probably promoted by tidal stresses which maximize at this hour and by the continuing geomagnetic storm. The antipode (34N 163W) of this epicenter at 34.3S 116.9E is within several degrees of the point at which Hurricane Florence made slope-fall several days ago off the coast of the Carolina's with winds up to 150 kts. It seems likely at energy from Florence focused on the antipode in Western Australia and helped promote today's event there.

 

The Australian quake is the strongest within about 400 km of this epicenter in Western Australia since an M 5.5 on January 17, 1990 about 300 km north of today's epicenter, the only other such quake in the region in the past 30 years.

 

O: 16SEP2018 04:56:23  34.4S  116.8E Mw=5.3  EMSC   WESTERN AUSTRALIA            

 

An M 5.4 also shook southern Peru today. NEIC reported it was felt with intensity IV in Arequipa, Peru and II-III in Arica, Tarapaca, Chile. CSN AND IGP reported this earthquake was felt with intensity III in  Arica at Arica, Chile; III-IV in Yura and Arequipa, Peru. No major damages or casualties were reported with this earthquake. Forecast 119653 had expected this event within about 50 km of the epicenter was likely around September 11. The last earthquake within about 200 km of this epicenter with M>5.4 was an M 5.6 on August 11, 2017, an aftershock of an M 6.4 on July 18, 2017. This activity is located at 103 degrees from Fiji where events of M 7.8 and 8.2 occurred on August 19 and September 6 and may have been promoted from that source as well.  This epicenter is near the antipode where Typhoon Mangkhut wrecked considerable destruction in the Philippines. It is currently located very near the antipode of Southern Peru.

 

O: 14SEP2018 11:20:01  16.0S   71.4W Mw=5.4  EMSC   SOUTHERN PERU                 

O: 14SEP2018 11:20     16.3S   71.7W mb=5.5  GUC    Arica at Arica, Chile; III-IV

O: 14SEP2018 09:08:09  16.6S   71.9W mb=4.5  EMSC   SOUTHERN PERU                

P: 11SEP2018 119653    16.0S   71.0W 4.0-5.8 BAAAA  So. Peru/Bolivia           

 

The swarm of earthquakes in the Ryukyu Islands directly associated with landfall of Typhoon Mangkhut continued today as well. The strongest earthquakes in the world today were two of M 5.6  in this swarm. Forecast 119499 expected moderate seismicity in southwestern Japan was likely around September 12.

 

NEIC reported this earthquake of M 5.5 in the Ryukyu Islands, Japan was felt with intensity II-III in the area(s) of Okinawa at Ishikawa, Okinawa, Ginowan, Chatan, Japan.

An earthquake of M 5.6 was reported felt in Okinawa earlier with intensity II-III in Ginowan and Urasoe, Okinawa.

 

O: 15SEP2018 08:19:17  26.6N  129.5E mb=4.9  EMSC   RYUKYU ISLANDS, JAPAN

O: 15SEP2018 15:37:58  26.6N  129.6E Mw=5.2  EMSC   RYUKYU ISLANDS, JAPAN

O: 15SEP2018 16:24:34  26.6N  129.6E Mw=5.6  EMSC   RYUKYU ISLANDS, JAPAN

O: 15SEP2018 08:32:21  26.6N  129.6E mb=5.1  EMSC   RYUKYU ISLANDS, JAPAN

O: 15SEP2018 08:05:28  26.7N  129.6E Mw=5.6  EMSC   RYUKYU ISLANDS, JAPAN

O: 15SEP2018 13:53:40  26.8N  129.7E Mw=4.9  EMSC   RYUKYU ISLANDS, JAPAN

O: 15SEP2018 05:38:37  26.8N  129.7E mb=4.8  EMSC   RYUKYU ISLANDS, JAPAN        

P: 12SEP2018 119499    29.0N  130.0E 4.0-5.4 BCAAA  Kyushu Japan               

 

A tectonic (as opposed to a volcanic) earthquake of M 3.6. hit northern Hawaii today following passage through the region of Hurricane Olivia. This is the strongest earthquake in the region of Maui in more than a year. An M 3.5 occurred about 100 km northeast of this on August 22 following the cessation of volcanic-related seismicity at the M>=3 level at Kilauea. The most recent quakes of M>=3.5 within about 100 km of today's epicenter occurred as an M 3.9 on June 23, 2018 and an M 4.2 on July 30, 2017.  Forecast 119497 had expected today's event was likely within about 30 km of the epicenter around September 9.

 

NEIC reported this earthquake of M 3.6 in Northern Hawaii  was felt with intensity IV in the area(s) of Hawaii at Kihei and II-III in Lanai City, Wailuku and Kahului.

 

O: 15SEP2018 10:55:22  20.4N  156.9W ML=3.6  EMSC   MAUI REGION, HAWAII          

P:  9SEP2018 119497    20.3N  156.6W 4.0-5.6 CAAAA  Hawaii area                

 

RYUKYU IS, JAPAN SWARM ACCOMPANIES SUPER-TYPHOON MANGKHUT

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 14, 2018

 

The strongest earthquakes of the day occurred in  the Ryukyu Islands of southwestern Japan. The largest of these included the mainshock of M 5.9 and aftershocks of M 5.5 and 5.6. NEIC reported the aftershocks were felt with intensity II-III in Okinawa at Nago, Ishikawa, Okinawa, Chatan, Ginowan and Urasoe, Ryukyu Islands, Japan. These events are located near northern Taiwan. This summary had expected moderate to strong seismicity was likely to accompany Super-typhoon Mangkhut as:

 

"A strong quake may accompany Typhoon Mangkhut in areas west of Guam as it passes through the region. It is then expected to track towards Taiwan where a second moderate quake may be promoted." (September 13-14, 2018)

 

The geomagnetic storm which began on September 10 continued today and probably also helped promote today's activity in the Ryukyu Islands which is about 10-15 degrees north of the geomagnetic equator. This had been anticipated in this

summary as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 16. High latitude geomagnetic field also saw minor storm conditions  with AP at 24. KP reached 8 around 0900 UT the first such since August 26 on September 11. This storm is likely to enhance seismicity at 10-15 degrees from the geomagnetic equator during the period September 15-18 and at high latitudes." (September 10-15, 2018)

 

The last earthquake in the Ryukyu Islands of M>=5.8 within about 200 km of this epicenter occurred more than a year ago on July 26, 2017. The last swarm in the region similar to today's with at least three events of M>=5.5 occurred on October 18 and 19, 1995 following an M 7.1 mainshock. Forecast 119505 had expected today's activity in mid-September within about 150 km of these epicenters.

 

O: 15SEP2018 08:19:17  26.6N  129.5E mb=4.9  EMSC   RYUKYU ISLANDS, JAPAN

O: 15SEP2018 08:32:20  26.7N  129.6E ML=5.2  EMSC   RYUKYU ISLANDS, JAPAN

O: 15SEP2018 04:40:18  26.7N  129.6E Mw=5.5  EMSC   RYUKYU ISLANDS, JAPAN

O: 15SEP2018 08:05:27  26.7N  129.6E Mw=5.6  EMSC   RYUKYU ISLANDS, JAPAN

O: 15SEP2018 01:48:32  26.7N  129.6E mb=4.8  EMSC   RYUKYU ISLANDS, JAPAN

O: 15SEP2018 04:52:46  26.7N  129.6E mb=4.9  EMSC   RYUKYU ISLANDS, JAPAN

O: 15SEP2018 04:54:36  26.7N  129.6E mb=4.9  EMSC   RYUKYU ISLANDS, JAPAN

O: 15SEP2018 00:08:19  26.7N  129.7E Mw=5.8  EMSC   RYUKYU ISLANDS, JAPAN

O: 15SEP2018 04:14:34  26.7N  129.7E mb=4.9  EMSC   RYUKYU ISLANDS, JAPAN

O: 15SEP2018 05:38:36  26.8N  129.7E mb=4.8  EMSC   RYUKYU ISLANDS, JAPAN        

P:  8SEP2018 119505    28.0N  128.0E 4.0-5.4 CBBAA  Ryukyu Islands             

P: 11SEP2018 119505    26.0N  125.0E 4.0-5.6 BACAA  Ryukyu Islands             

 

The strongest earthquake of the day, however, was an M 5.9 near local solar midnight in the Papua, Indonesia area. It was not reported felt or damaging in the epicentral area. Forecasts 119461 had expected this area would be active in mid-September. This epicenter is located about 10 degrees south of the geomagnetic equator and was probably promoted by the current geomagnetic storm. The lat event within about 200 km of this epicenter with M>=5.9 occurred on September 17, 2016 with M 5.9. The last of larger magnitude was an M 7.0 three years ago on July 27, 2015.

 

O: 14SEP2018 15:50:12   2.8S  138.8E Mw=5.9  EMSC   PAPUA, INDONESIA             

P:  7SEP2018 119461     1.0S  137.0E 4.0-5.7 CBBAA  West Irian, PNG            

P: 10SEP2018 119461     4.0S  136.0E 4.0-5.5 BBCAA  West Irian, PNG            

 

 

An M 5.4 also shook southern Peru today. NEIC reported it was felt with intensity IV in Arequipa, Peru and II-III in Arica, Tarapaca, Chile. CSN AND IGP reported this earthquake was felt with intensity III in  Arica at Arica, Chile; III-IV in Yura and Arequipa, Peru. No major damages or casualties were reported with this earthquake. Forecast 119653 had expected this event within about 50 km of the epicenter was likely around September 11. The last earthquake within about 200 km of this epicenter with M>5.4 was an M 5.6 on August 11, 2017, an aftershock of an M 6.4 on July 18, 2017.

 

O: 14SEP2018 11:20:01  16.0S   71.4W Mw=5.4  EMSC   SOUTHERN PERU                

O: 14SEP2018 11:20     16.3S   71.7W mb=5.5  GUC    Arica at Arica, Chile; III-IV

O: 14SEP2018 09:08:09  16.6S   71.9W mb=4.5  EMSC   SOUTHERN PERU                

P: 11SEP2018 119653    16.0S   71.0W 4.0-5.8 BAAAA  So. Peru/Bolivia           

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 north of the aftershock zone in the Gulf of Alaska.  NEIC reported this earthquake of M 3.9 in Central Alaska was felt with intensity IV in Wasilla, Alaska and II-III in the area(s) of Alaska at Chugiak and along the Matanuska-Sustina Border.  The last quake with M>=4.2 in the northern Gulf of Alaska within about 150 km

of this epicenter was an M 4.3 two months ago on July 13, 2018. Forecast 119625 had expected today's event to the northwest in mid-September.

 

O: 14SEP2018 17:29:31  58.6N  150.6W ML=4.2  EMSC   GULF OF ALASKA               

P:  9SEP2018 119625    60.0N  153.5W 3.2-5.1 BABAA  Central Alaska             

 

Seismicity along the western rim of North America remained muted today as motions from Hurricane Florence increased normal friction across many vertical faults in the area. No significant quakes were reported in the area today. In Costa Rica and northern South America, effects from Florence may have been more pronounced.

 

A moderate quake of M 4.8 occurred today in the area southwest of Africa. It was not felt in this remote area. Forecast 119696 had expected this epicenter to be active around September 12. This is located at the antipode of the Fox Islands, Alaska (52N 165W) where it may enhance further activity in this active region. An event of M 5.9 hit west of this on August 25.

 

O: 15SEP2018 02:50:33  52.3S   15.7E mb=4.8  EMSC   SOUTHWEST OF AFRICA          

P: 12SEP2018 119696    53.0S   19.0E 4.0-5.8 BABAA  Atlantic-Indian Ridge      

 

STRONG QUAKE NORTH OF ANTARCTICA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 13, 2018

 

The strongest earthquake in the world today occurred in the southeast Pacific Rise north of Antarctica. This event of M 5.5 was not reported felt in the epicentral area. The last earthquake in this region with M>=5.5 was an M 5.8 more than a year ago on June 15, 2017 and prior to that on August 18, 2016. This epicenter is located at 99-100 degrees from the Lombok, Indonesia region and may have been promoted by energy from that area.

 

O: 13SEP2018 11:38:04  55.9S  123.3W Mw=5.5  EMSC   SOUTHERN EAST PACIFIC RISE   

 

An earthquake of M 2.6 occurred today in South Carolina as Hurricane Florence made slopefall off the coasts of North Carolina and South Carolina. NEIC reported this earthquake was felt lightly in South Carolina at Darlington, Columbia, Lexington, Aiken, North Augusta, and McCormick. The Georgia/South Carolina event of M 2.6 is the strongest within about 100 km of this epicenter since an M 3.2 on June 20, 2017 and prior to that an M 3.2 on February 15, 2014.

Forecast 119526 expected this activity was likely around September 11.

 

O: 13SEP2018 06:27:40  33.9N   82.3W Md=2.6  EMSC   GEORGIA, USA                 

P: 11SEP2018 119526    35.0N   82.0W 2.0-4.5 ABAAA  Kentucky/Tennessee/NC      

 

A pair of light earthquakes also shook southeastern Missouri today with M 2.4 and 2.6. The last event with significantly larger magnitude in the area was an M 3.6 on January 16, 2018. Forecast 119531 expected this event in early September.

 

O: 14SEP2018 03:15:20  36.5N   89.5W MD=2.4  EMSC   SOUTHEASTERN MISSOURI        

O: 14SEP2018 01:55:02  36.5N   89.5W MD=2.6  EMSC   SOUTHEASTERN MISSOURI        

P:  7SEP2018 119531    36.9N   89.2W 2.0-4.1 CAAAA  New Madrid area            

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in northern Alaska. This is part of the aftershock sequence following quakes of M 6.4 and 6.0 of August 12. Forecast 119634 expected this event was likely around September 11. The earthquakes today appear to be migrating to the west or expanding the aftershock region. More data in coming days could show if this is correct.

 

O: 13SEP2018 23:26:47  69.1N  146.6W ML=3.2  EMSC   NORTHERN ALASKA              

O: 14SEP2018 05:02:15  69.1N  147.1W ML=3.9  EMSC   NORTHERN ALASKA              

P: 11SEP2018 119634    69.4N  144.8W 3.0-4.9 BAAAA  Northern Alaska            

 

MODERATE QUAKES IN NEW IRELAND AND CHINA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 12, 2018

 

The strongest earthquake in the world today was an M 5.4 in New Ireland in the southwest Pacific It was not reported felt in the epicentral area. It follows a similar M 5.5 about 100 km to the west of this on September 3, 2018. Forecast 119448 expected this event was likely within about 50 km of the epicenter was likely around September 11. Earthquakes of M 5.2 also occurred today in Gansu, China and in the Southwest Indian Ocean Ridge.

 

O: 12SEP2018 22:32:39   3.8S  151.6E mb=5.4  EMSC   NEW IRELAND REGION, P.N.G.   

P: 11SEP2018 119448     4.0S  152.0E 4.0-5.5 AAAAA  New Britain                

 

An earthquake of M 4.5 also occurred today in Guam. This may have been promoted by Super-Typhoon Mangkhut which passed over this epicenter two days ago as noted in this summary:

 

"Typhoon Mangkhut (TD 26W) continued today in the area of Guam today with winds up to 145 kts.  It is expected to track to the west reaching Guam as a typhoon or super-typhoon around September 11-13. The area of Guam is sensitive to typhoon related seismicity and a moderate to strong quake may accompany Typhoon Mangkhut as it passes through the region." (September 11, 2018)

 

The last earthquake of M>=4.5 within about 150 km of today's epicenter in Guam occurred July 18, 2018 with M 4.8.Forecast 119490 had expected Guam to be active around September 11.  NEIC reported this earthquake of M 4.5 in Guam was felt with intensity II-III in the area(s) of Santa Rita, Piti, Yona, Tamuning and Yigo, Guam.

 

O: 13SEP2018 02:23:19  13.5N  144.6E mb=4.5  EMSC   GUAM REGION                  

P: 11SEP2018 119490    12.0N  145.0E 4.0-5.4 ABAAA  So. Marianas/Guam          

 

Earthquakes of M 1.7 and M 1.9 in the area of southern Pennsylvania today may have been promoted by stresses on the area from the movement of North America which were affected by continental slope interaction with Hurricane Florence which is still off the coast of North Carolina. Forecast 119580 had expected seismicity in this area in early September.

 

O: 12SEP2018 09:48:51  40.4N   76.0W ml=1.7  ANSS   Flying Hills Pennsylvania    

O: 12SEP2018 07:49:35  40.4N   76.0W ml=1.9  ANSS   WSW of Shillington Pennsylvani

P:  6SEP2018 119580    43.0N   78.0W 2.0-4.3 CCBAA  New York State             

 

The strongest earthquake in the U.S. or Alaska today was an M 4.0 in the Andreanof Islands. This part of the aftershock sequence of the M 6.6 of August 15 and the M 6.3 of August 23, 2018. It was not reported felt. Forecast 119602 had expected this earthquake was likely around September 9.

 

O: 12SEP2018 17:57:41  51.4N  177.9W mb=4.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  9SEP2018 119602    50.8N  179.5W 3.5-5.1 BAAAA  Andreanoff Isls, Aleutians 

 

MODERATE QUAKES SHAKE ASSAM, INDIA; NICARAGUA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 11, 2018

 

Tidal stresses were promoting seismicity at 90E and 90W longitudes today. The resulting earthquakes of M 5.3-5.5 occurred in Assam, India and in Nicaragua. The M 5.3-5.5 earthquake in Assam, India today was the strongest to occur on this date. NEIC reported maximum intensity VI in Assam at Kokrajhar and V in Sapatgram, Gossaigaon, Tufanganj, Dinhata, Barpeta, with intensity II-III as far as 450 km from the epicenter in Bangla, and Amarpur. It was also felt with intensity VI in Kurigram, Bangladesh, Thimphu, Bhutan, Nepal.  This event occurred within about an hour of local solar noon and was probably promoted by tidal stresses associated with the new moon. This longitude (90 degrees East) had been expected to see strong tidal triggering at this time in this summary's tidal forecast as:

 

"The new moon arrived at 18:01 on September 9. Longitudes at sub-solar conditions  are new 90 West and those near sub-lunar are at 90 East longitude. These are most likely to see tidal triggering in the next week. They include in  the west, Central America and the U.S. and the South American subduction  zone and in the east Indonesia and Southeast Asia among others." (September 9-12, 2018)

 

This event is Assam is the strongest within about 250 km of this epicenter since an M 5.5 on June 28, 2015. Forecast 119502 expected this earthquake in  this area was likely around September 5. The epicenter is at 103 degrees from the M 6.9 in the Kermadec Islands of September 10. Other events at 103 degrees from the Kermadec quake occurred in northern Alaska; in Alberta, Canada and in Oklahoma. Energy from large earthquakes is redirected to distances around 103 degrees from these events and may help promote seismicity in this distance zone.

 

O: 12SEP2018 04:50:47  26.4N   90.4E Mw=5.3  EMSC   ASSAM, INDIA                 

P:  5SEP2018 119502    27.0N   88.0E 3.5-5.6 BABAA  Nepal                      

 

An earthquake of M 5.3 was felt widely in Nicaragua today. NEIC reported it was felt with intensity IV in Nicaragua at Leon, Managua, Ciudad Sandino, Ticuantepe, Masaya, Granada, and in Samara, Costa Rica. Intensity II-III was reported in Mejicanos, El Salvador and Belen, Costa Rica and in Nicaragua at Bocana de Paiwas, Catarina, Jinotepe, and Chichigalpa, Nicaragua. Like the event in Assam, India, this epicenter occurred at the longitude of maximum tidal stresses as noted above (90 West longitude). The last earthquake within about 200 km of this epicenter in Nicaragua of M>=5.3 occurred July 27,2018 with the last of larger magnitude M 5.6 on May 6, 2018. A major quake of M 7.0 occurred in Nicaragua on November 24, 2016.  Forecast 119482 expected this earthquake was likely around September 11. This epicenter is at 105 degrees from the Loyalty Islands and may have been promoted from that source. It is also near this distance from the Kermadec Islands quake of September 10.

 

O: 12SEP2018 06:29:53  12.2N   86.8W mb=5.3  EMSC   NICARAGUA                    

O: 11SEP2018 18:26:02  12.5N   87.4W mb=4.5  EMSC   NEAR COAST OF NICARAGUA      

P: 11SEP2018 119482    13.0N   88.0W 3.5-5.3 AAAAA  Nicaragua                  

 

An M 5.2 also occurred in southwestern Turkey today. It was reported by NEIC to have been felt with intensity II-IV in Antalya, Turkey at Manavgat, Serik, Alanya, Dalman, and in Cyprus with intensity IV in Arediou, Nicosia and II-III at Lemesos, and Livadia. No major damage was reported with this earthquake. The last earthquake within about 200 km of this epicenter with M>=5.2 occurred on October 6, 2015 with M 5.4. Forecasts 119556 and 119510 expected this activity in western Turkey around September 9-10. This earthquake occurred at 144-147 degrees of the recent great quakes in Fiji and at 142 degrees from the Loyalty Islands and were probably promoted from those source.

 

O: 12SEP2018 06:21:48  36.0N   31.1E Mw=5.2  EMSC   WESTERN TURKEY               

P:  9SEP2018 119556    39.0N   31.0E 3.5-4.9 BBAAA  Turkey                     

P: 10SEP2018 119510    36.0N   27.0E 3.0-4.8 AACAA  Aegean Sea                 

 

A moderate earthquake of M 4.3 was widely felt in the Virgin Islands and Puerto Rico today. NEIC reported it was felt with maximum intensity V in Puerto Rico at Fajardo and IV in the Virgin Islands at Saint Thomas and Saint John, and with lesser intensity of II-III in Road Town, British Virgin Islands and Christiansted, VI and II-III in Culebra, Carolina, San Juan, Guaynabo and Corozal, Puerto Rico. The last earthquake in the Virgin Islands of M>=4.3 occurred on April 11, 2018. Today's event may have been triggered by high tidal stresses as it occurred within minutes of local solar midnight. Forecast 119477 had expected this  event was likely around September 11. This epicenter is at the third node (120 degrees) from Fiji and was probably promoted from this source.

 

O: 12SEP2018 04:18:03  18.8N   64.9W mb=4.3  EMSC   VIRGIN ISLANDS REGION        

P: 11SEP2018 119477    18.0N   64.0W 3.0-5.3 AAAAA  Leeward Islands            

 

The strongest and most unusual earthquake in the U.S. or Canada today was an M 3.8 in the region of Utah where it was felt with intensity III in Salt Lake City.

 

An M 3.6 in Hawaii today occurred as Hurricane Olivia made a direct hit on the islands. NEIC reported it was felt with intensity II-III in Hawaii at Paauilo, Kamuela, Waikoloa, Honokaa, Ookala, Honolulu, Kapaa.  This is the largest earthquake recorded in Hawaii since an M 4.4 on August 9 2018 and the largest outside the Kilauea region since the beginning of the Kilauea eruption in May, 2018. It occurred as Olivia was passing over the epicenter and was almost certainly triggered by stresses from that storm. Forecast 119476 expected today's event was likely around September 11.

 

O: 11SEP2018 18:54:07  19.8N  155.6W ML=3.6  EMSC   ISLAND OF HAWAII, HAWAII     

P: 11SEP2018 119476    19.9N  156.1W 3.0-4.5 AAAAA  Hawaii                     

 

Another light earthquake of M 2.5 hit eastern Texas today in the Timpson area.

NEIC reported it was felt with intensity III in Timpson, Texas and in Independence, Louisiana. A similar quake in this area occurred as Hurricane Gordon was making landfall in Mississippi on September 4. Forecast 119553 had expected today's event was likely within about 50 km of this epicenter around September 6.

 

O: 12SEP2018 04:35:06  31.9N   94.4W ML=2.5  EMSC   EASTERN TEXAS                

P:  6SEP2018 119553    32.0N   94.0W 2.0-4.1 CAAAA  Southeast U.S.             

 

Another aftershock in the area off Newfoundland, Canada occurred northeast of Bonavista today with M 3.6. This follows earthquakes in the area of M 4.3 on September 3, 2018. Earthquakes of M 4.3 hit the region on March 29 and August 29, 2013 and of M 4.5 on November 18, 2008, the only such events of M>=3.8 within about 200 km of this epicenter in the past 30 years. Forecast 119623 had expected this event was likely around September 10 within about 25 km of this epicenter.

 

O: 11SEP2018 00:22:23  50.3N   50.2W ML=3.6  NRCA  278 km NE from Bonavista      

P: 10SEP2018 119623    50.0N   50.0W 2.5-4.0 AAAAA  Baffin/Davis Strait Canada 

 

M 6.3 AFTERSHOCK IN LOYALTY IS. CONTINUES REGIONAL ACTIVATION

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 10, 2018

 

The area of the southwest Pacific has seen a number of strong earthquakes in the past several days including an M 6.9 in the Kermadec Islands and an M 6.5 in  the Solomon Islands yesterday. This continued today with an M 6.3 aftershock in the Loyalty Islands. An M 7.1 mainshock hit the area on August 29 but today's M 6.3 is the strongest aftershock to date. Forecast 119665 had expected this earthquake was likely within the Loyalty Islands around September 10.  A pair of earthquakes in Turkey of M 4.8 and 4.9 were located at 144 degrees from the Loyalty Islands today and probably were promoted by the M 6.3 and other strong Loyalty Island events. Strong concentration of seismic energy occurs on the surface at this distance after core reflections and refractions of seismic energy.

 

O: 10SEP2018 19:31:39  22.0S  170.1E Mw=6.3  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

O: 10SEP2018 20:41:21  22.0S  170.4E mb=4.8  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 10SEP2018 119665    22.0S  171.0E 4.0-5.4 AAAAA  Loyalty Islands            

 

O: 10SEP2018 15:07:10  37.0N   27.8E mb=4.8  EMSC   DODECANESE IS.-TURKEY BORDER RE

P: 10SEP2018 119510    36.0N   27.0E 3.0-4.8 AAAAA  Aegean Sea                 

 

NEIC reported this earthquake of M 4.8 in Turkey was felt with intensity IV in Marmaris and Fethiye, Mugla, Turkey and II-III in the area(s) of Modrum, Ula and in Greece at Kos, Dodecanese Is, and Planos, Zakinthos. 

 

O: 10SEP2018 23:02:56  37.2N   30.6E mb=4.9  EMSC   WESTERN TURKEY               

P:  9SEP2018 119556    39.0N   31.0E 3.5-4.9 ABAAA  Turkey                     

 

NEIC reported this earthquake of M 4.9 in Turkey was felt with intensity IV in Antalya at Kumluca and Alana and II-III in the area(s) of Turkey at Antalya, Serik, Manavgat, and in Plovdiv, Bulgaria.

 

The strongest earthquake in the U.S. or Canada today was an aftershock in the region of Northern Alaska following the M 6.5 of August 12, 2018. Earthquakes of this size have occurred nearly daily since that time with the last an M 4.0 on September 6. Forecast 119634 expected today's ativity was likely around September 11.

 

O: 10SEP2018 23:37:09  69.6N  144.4W Mw=3.9  EMSC   NORTHERN ALASKA              

O: 10SEP2018 23:37:09  69.6N  144.6W Mw=4.2  EMSC   NORTHERN ALASKA              

P: 11SEP2018 119634    69.4N  144.8W 3.0-4.9 AAAAA  Northern Alaska            

 

The region of California has been very quiet over the past two days. With Hurricane Florence moving directly in to the continental slope, this may be creating strong normal stress across regional  vertical faults. As Florence moves into the east coast of the U.S. this lack of California seismicity is likely to continue. After landfall horizontal motions of North America associated with landfall will probably reactivate seismicity in the west coast of the U.S. In the past this has often coincided with a strong regional event, but the current conditions are ambiguous in this regard.

 

STRONG QUAKES IN SOUTHWEST PACIFIC CONTINUE

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 9, 2018

 

A strong earthquake of M 6.9 hit the region of the Kermadec Islands, New Zealand today.  NEIC reported light shaking was felt in New Zealand in the Bay of Plenty, Auckland, Napier, Hawke's Bay, Wellington, and Canterbury at Christchurch and up to 1500 km from the epicenter. Earthquakes of any size are not normally felt in the Kermadec Islands so the felt cone from today's event is unusual. The last earthquake in the Kermadec Islands within about 200 km of this epicenter of M 6.9 or greater was an M 6.9 on June 23, 2014 and prior to that an M 7.4 on May 16, 2006. Earthquakes of M 6.9 also occurred on May 3, 1997 and July 9, 1998, the only other such events in the past 30 years.  Forecast 119687 had expected today's event within about 100 km around September 7.

 

O: 10SEP2018 04:33:01  31.5S  179.0W mb=4.9  EMSC   KERMADEC ISLANDS REGION      

O: 10SEP2018 05:06:00  31.9S  179.0W mb=5.0  EMSC   KERMADEC ISLANDS REGION      

O: 10SEP2018 06:31:40  31.9S  179.8E mb=4.9  EMSC   KERMADEC ISLANDS REGION      

O: 10SEP2018 04:19:00  32.1S  179.2W Mw=6.9  EMSC   SOUTH OF KERMADEC ISLANDS    

P:  7SEP2018 119687    32.0S  178.0W 4.0-5.6 BAAAA  So. Kermadec Islands       

 

The M 6.9 in the Kermadec Islands follows an M 6.5 in the Solomon Islands to the northwest of that epicenter earlier in the day. NEIC reported it was felt with intensity III in Honiara, Guadalcanal, Solomon Islands. This is the strongest earthquake within about 200 km of this epicenter in the Solomon Islands since an M 6.5 on January 19, 2017. These are probably aftershocks of the M 7.8 near this epicenter of December 8, 2016. Forecast 119649 had expected today's event within about 50 km was likely around September 12.

 

The events in the Solomon and Kermadec Islands today were expected as part of the ongoing strong seismic enhancement of the region as noted in the previous issue of this summary:

 

"Strong seismicity is expected to continue in the southwestern Pacific over the next several days,  some associated with tidal stresses." (September 8-9, 2018)

 

O:  9SEP2018 19:31:35  10.0S  161.4E Mw=6.5  EMSC   SOLOMON ISLANDS              

P: 12SEP2018 119649    10.0S  161.0E 4.0-5.4 BAAAA  No. of Santa Cruz Islands  

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the Rat Islands, Aleutians. The area of the Rat Islands has seen a lull in seismicity over the past month with the last earthquake of M>=4.2 an M 4.5 on August 5, 2018, coinciding with the los of significant seismicity in Hawaii. Forecat 119614 expected today's  event was likely around September 9.

 

O:  9SEP2018 07:24:45  51.5N  177.0E mb=4.2  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  9SEP2018 119614    52.0N  176.0E 4.0-5.8 AAAAA  Rat Islands                

 

The strongest earthquake in the U.S. or Canada outside Alaska today was an M 3.3 in the Puget Bay region of Washington State. NEIC reported it was felt with intensity II-II in Washington at Lopez Island, Coupeville, Friday Harbor, Oak Harbor, Sequim, Port Townsend, Port Angeles, La Conner, Camano Island, Port Ludlow, Poulsbo, Silverdale, Bremerton, Buckley, Castle Rock; in Oregon at Portland  and in British Columbia, Canada at Walnut Grove, Port Alberni, Sidney, Sooke, Cowichan Valley, Lake Cowichan, Victoria. This is the strongest earthquake within about 50 km of this epicenter in the Juan de Fuca Strait since an M 3.3 nearly a year ago on October 2, 2017. The last such event of larger magnitude was an M 3.7 on June 16, 2017.  Forecast 119597 had expected this event within about 25 km was likely around September 9.

 

O:  9SEP2018 12:55:44  48.3N  123.0W ML=3.3  EMSC   STR. OF JUAN DE FUCA, WASHINGT

P:  9SEP2018 119597    48.4N  123.2W 2.0-4.4 AAAAA  Washington state, U.S.     

 

An earthquake of M 3.8 occurred in Iceland today. It was not reported felt or damaging in the area. This is the first earthquake within about 200 km of this epicenter in Iceland with M>=3.8 since an M 4.5 on July 1, 2015.    Forecast 119632 expected today's activity was likely around September 10. This quake may have been promoted by energy from an antipodal quake in  the Balleny Islands of September 7 as noted in a previous summary:

 

"O:  7SEP2018 22:14:02  61.1S  160.4E mb=5.0  EMSC   BALLENY ISLANDS REGION        

 

The antipode of this is at 61N 20W near southern Iceland and could see some promoted seismicity in coming days." (September 7, 2018)

 

O: 10SEP2018 04:38:10  64.4N   21.8W ML=3.8  EMSC   ICELAND                      

P: 10SEP2018 119632    65.0N   17.0W 3.0-4.5 AABAA  Iceland area               

 

NEW MOON TRIGGERS SUB-SOLAR SEISMICITY

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 8, 2018

 

The new moon arrived today and was accompanied by several regionally significant

earthquakes at sub-solar locations. Among these were an M 2.8 in San Francisco, California and an M 5.5 in Tonga/Fiji. The event in the area south of Fiji of M 5.5 occurred within about 5 minutes of local solar noon. This is not an aftershock of the Fiji great quakes of late August and early September but may represent an extension of that activity 700 km to the south. This, and an aftershock of M 4.6 were preceded 1.5 hours earlier by an M 5.5 south of Tonga, another event near local solar noon which may have been promoted by the new moon tidal alignment. The strongest earthquake of the day, however, was an M 5.7 in  the Loyalty Islands aftershock zone. It occurred within about 2 hours of local solar midnight and may also have been promoted by tidal stresses. Strong seismicity is expected to continue in the southwestern Pacific over the next several days, some associated with tidal stresses. Forecast 119665 had expected this activity was likely around September 10.

 

The last earthquake with M>=5.5 in the area south of the Fiji Islands within about 200 km of today's event to the west of the IDL was an M 5.5 on April 24, 2018. The only such event in the past year of larger magnitude was an M 5.9 on January 2, 2018. Forecast 119676 had expected this event was likely around September 6. The M 5.5 to the east of this in the area South of Tonga had been expected to occur around September 6 in forecast 119674.

 

 

O:  9SEP2018 00:06:25  25.0S  179.9E Mw=5.5  EMSC   SOUTH OF FIJI ISLANDS        

O:  9SEP2018 01:11:49  25.0S  179.9E mb=4.6  EMSC   SOUTH OF FIJI ISLANDS        

P:  6SEP2018 119676    24.0S  179.0E 4.0-5.4 BAAAA  Tonga/Fiji                 

 

O:  8SEP2018 22:27:28  24.4S  175.9W Mw=5.5  EMSC   SOUTH OF TONGA               

P:  6SEP2018 119674    22.0S  177.0W 4.0-5.6 ACAAA  Tonga Islands              

 

O:  8SEP2018 10:02:48  22.2S  170.3E Mw=5.7  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

O:  8SEP2018 14:49:14  22.5S  170.2E mb=4.8  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 10SEP2018 119665    22.0S  171.0E 4.0-5.4 AAAAA  Loyalty Islands            

 

 

The earthquake of M 2.8 was widely felt in the San Francisco Bay area of California today. This event was probably promoted by high tidal stresses. It occurred within a couple of minutes of local solar noon in association with the strongest tidal stresses of the new moon. NEIC reported it was felt with intensity II-III in California at Oakland, Alameda, Berkeley, Emeryville, Moraga, San Leandro, Albany, Lafayette, San Lorenzo, San Francisco, Hayward, Walnut Creek, Alamo, Dublin, Fremont, Pittsburg and San Jose, California.

The last earthquake of M>=2.8 within about 50 km of today's epicenter in the San Francisco Bay area of California was an M 2.9 on July 14, 2018. A series of events has occurred in early September about 60 km southeast of today's epicenter including an M 3.4 on September 3.  Forecast 119518 had expected today's event was likely within about 25 km of the epicenter around September 11.

 

O:  8SEP2018 20:06:54  37.8N  122.2W MD=2.8  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 11SEP2018 119518    38.0N  122.3W 2.5-4.4 BAAAA  Central California          

 

The largest earthquake in California today was an M 2.9 in the Kettleman City area of Central California. Like the event in San Francisco 12 hours later, this quake was also probably triggered by high tidal stresses associated with the new moon. It occurred at exactly local solar midnight when such stresses are maximized. The last earthquake with M>=2.9 within about 50 km of this epicenter in central California occurred on April 20, 2018 with M 3.0. Forecast 119516 had expected today's event was likely in the area around September 6.

  

 

O:  8SEP2018 08:00:40  36.1N  120.1W MD=2.9  EMSC   CENTRAL CALIFORNIA           

P:  6SEP2018 119516    36.2N  120.8W 2.5-4.4 AAAAA  Central California         

 

Several earthquakes in the southeastern U.S. today may have been affected by stresses from TS Gordon, which is currently dissipating over the area, and in combination with the soli-lunar tides of the new moon. These were an M 2.7 in the New Madrid region of Southeastern Missouri and an M 2.3 in Georgia, U.S.A.

 

O:  9SEP2018 03:00:04  34.8N   85.2W MD=2.3  EMSC   GEORGIA, USA                 

P: 10SEP2018 119552    34.0N   85.0W 2.0-4.2 AAAAA  Southeast U.S.             

 

The earthquake in the New Madrid region of Missouri of M 2.7 was the strongest in that region within about 50 km since an M 2.7 on June 17, 2018. The only event of larger magnitude in the past year  was an M 3.6 on January 16, 2018.

Forecast 119531 had expected it was likely in this area around September 7. This activity may be related to the Fiji quake of September 6 of M 7.8 which is located at 102 degrees from it.  NEIC reported this earthquake of M 2.7 in Missouri was felt with intensity II-III in the area(s) of Hughes, Arkansas.

 

O:  8SEP2018 23:10:32  36.5N   89.6W MD=2.7  EMSC   SOUTHEASTERN MISSOURI        

P:  7SEP2018 119531    36.9N   89.2W 2.0-4.1 AAAAA  New Madrid area            

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 in western Oklahoma. NEIC reported this earthquake of M 3.7 in Oklahoma was felt with intensity II-III in the area(s) of Thomas, Oklahoma. The M 3.7 is the strongest within about 100 km of this epicenter in Oklahoma since an M 3.8 on April 19, 2018.  Forecast 119554 had expected this event in this region was likely around September 12.

 

O:  8SEP2018 14:36:33  36.4N   98.8W mb=3.7  EMSC   OKLAHOMA                     

O:  9SEP2018 02:01:47  36.5N   98.7W mb=2.4  EMSC   OKLAHOMA                     

O:  9SEP2018 01:48:38  36.5N   98.7W mb=3.3  EMSC   OKLAHOMA                     

P: 12SEP2018 119554    37.0N   98.0W 2.0-4.2 BAAAA  Southern Plains            

 

SOUTHEAST ASIA, INDONESIA AND PHILIPPINES SEE ENHANCED SEISMICITY

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 7, 2018

 

A series of moderately strong to strong earthquakes occurred today in the central Indonesia, Philippines and Southeast Asia regions. These included quakes of M 5.4-5.6 in the Bismarck Sea, and the Celebes Sea as well as in Yunnan, China. Much of this activity may have been promoted by high tidal stresses associated with the new moon of September 9 as they lie near the maximum stress longitude for this event. The largest of these was a strong earthquake of M 6.1-6.4 hit Mindanao, Philippines today. NEIC reported it was felt with maximum intensity V in Southern Mindanao at Mahayag and IV in Catel, Pagsabangan, Davao, Mabuhay, and Ula. Lesser shaking of II-III was felt in Southern Mindanao at Bato, Digos and in Butuan, Caraga, Philippines. PHIVOLCS reported it was felt with intensity VI in Manay and Tarragona, Davao Oriental, V i Davao City; Mati City, Davao Oriental; Rosario, Agusan Del Sur, Maco, Compostela Valley; IV in Koronadal City; Bislig City; Caraga, Davao Oriental; Tagum City; III in Tupi, South Cotabato; Alabel, Glan and Malapatan, Sarangani' II in Cotabato City; Gen. Santos City; Valencia City, Kalilangan, San Fernando and Maramag, Bukidnon; Gingoog City, Misamis Oriental; Butuan City and I in Cagayan de Oro City; Manolol Fortich, Bukidnon, Philippines. The last earthquake of M>=6.1 in Southern Mindanao, Philippines within about 250 km of today's epicenter occurred as an M 6.3 on September 23, 2016. The last of M>6.4 in the area was an M 7.5 on January 1, 2001 more than 17 years ago.  Forecasts 119432 and 119434 had expected today's event was likely within about 50 km around September 11. This epicenter is located at the sixth node (60 degrees) from Fiji and 51.5 (node 7) from the M 7.1 in the Loyalty Islands and may have been promoted from these and the Fiji events of M 7.8 and M 8.2 activity.

 

O:  8SEP2018 07:16:48   7.3N  126.6E Mw=6.3  EMSC   MINDANAO, PHILIPPINES        

O: 08SEP2018 07:16:49  07.1N  126.5E MS=6.4  PHI  Felt with intensity VI

O: 08SEP2018 07:16:49   7.2N  126.5E mw=6.1  ANSS   WNW of Manay Philippines

P: 11SEP2018 119432     7.0N  127.0E 4.0-5.5 BAAAA  Halmahera                  

P: 11SEP2018 119434     7.0N  127.0E 4.0-5.5 BAAAA  Halmahera                  

 

Two other moderately large quakes in Indonesia occurred in the Bismarck Sea (M 5.4) and in the Celebes Sea (M 5.4). They were not reported felt in these areas. The Celebes Sea event was the strongest in that area within about 200 km of that

epicenter since an 5.8 on October 27, 2016 about 200 km southeast of today's epicenter.  Forecast 119435 had expected this event was likely to the north around September 10.

 

O:  7SEP2018 20:44:10   2.8N  124.9E Mw=5.4  EMSC   CELEBES SEA                  

P: 10SEP2018 119435     4.0N  125.0E 4.0-5.6 BBAAA  Mindanao, Philippines      

 

The M 5.4 in the Bismarck Sea was the largest in that area within about 200 km of today's epicenter since an M 5.4 on July 6, 2018. An M 6.3 hit the area to the west on January 26, 2018 and this may be a regional aftershock of that event.   Forecast 119448 had expected today's activity in this area was likely around September 6.

 

O:  8SEP2018 00:28:34   3.0S  146.6E mb=4.6  EMSC   BISMARCK SEA                  

O:  7SEP2018 13:07:15   3.4S  146.6E Mw=5.4  EMSC   BISMARCK SEA                 

P:  6SEP2018 119448     3.0S  148.0E 4.0-5.4 AABAA  New Ireland                

 

An M 5.6 in Yunnan, China today was not reported to have caused damage in this area but may be reported at a later time. A series of events of M 4.5-4.9 hit Yunnan in mid-August about 200 km northwest of today's epicenter beginning on August 10 and ending northwest of this on August 17, 2018 but the last earthquake in the region of Yunnan of equal or larger magnitude than today's M 5.6 was an M 6.0 on October 7, 2014 nearly four years ago. Today's enhanced magnitude may have been promoted by tidal stresses which maximize tomorrow near this longitude as previously noted in this summary:

 

 

"The new moon will arrive at 18:01 on September 9. Longitudes at sub-solar conditions are new 90 West and those near sub-lunar are at 90 East longitude. These are most likely to see tidal triggering in the next week. They include in  the west, Central America and the U.S. and the South American subduction  zone and in the east Indonesia and Southeast Asia among others." (September 7-8, 2018)

 

O:  8SEP2018 02:31:31  23.4N  101.5E Mw=5.6  EMSC   YUNNAN, CHINA                

P: 10SEP2018 119501    25.0N   97.0E 4.0-5.4 ABBAA  Myanmar                    

 

The death toll in the M 6.7 in Hokkaido, Japan continued to rise today. More than 18 are now confirmed dead with more than 20 still missing. Most of the dead and missing were lost when massive landslides occurred during and following the quake. These buried houses and factories. The main power plant in Hokkaido was among these affected. Power will be slow to restore to the more than 3 million affected  users in Hokkaido. An M 5.0 aftershock, expected in forecasts 119568 around September 7-8 hit the region of Hokkaido today.

 

O:  7SEP2018 13:43:47  42.7N  142.0E mb=5.0  EMSC   HOKKAIDO, JAPAN REGION       

P:  7SEP2018 119568    42.0N  142.0E 3.5-6.4 AAAAA  Hokkaido, Japan            

P:  8SEP2018 119568    43.0N  141.0E 3.5-5.6 AAAAA  Hokkaido, Japan            

 

The strongest earthquakes in the U.S. or Canada today occurred in the Fox Islands, Aleutians with M 4.3 and a second event about 150 km to the east of M 4.1. These events were not reported felt in this remote area. The last earthquake with M>=4.3 in the Fox Islands was an M 4.5 and 4.7 on August 31, 2018. These, and the quakes today, are probably aftershocks of the M 6.0 of August 24, 2018 in the western Fox Islands. Forecast 119604 had expected today's event within about 25 km of the M 4.3 was likely around September 6.

 

O:  7SEP2018 07:30:16  51.9N  171.4W mb=4.3  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O:  7SEP2018 23:47:41  52.4N  169.7W mb=4.1  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  6SEP2018 119604    52.1N  171.3W 3.5-5.3 AAAAA  Andreanoff Isls, Aleutians 

 

GREAT QUAKE HITS DEEP UNDER FIJI

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 6, 2018

 

A second great earthquake of M 7.8 hit at a deep focus under Fiji today. This follows an M 8.2 in Fiji of August 19, 2018, the strongest quake in the world in at least three years. Today's event at 627 km depth is down the subduction zone in Fiji from the M 8.2 event which occurred at 558 km and was probably part of the breakage of this portion of the Fiji slab. The mainshock was felt throughout the Fiji Islands with intensity IV in Nausori and Nadi and II in Suba, Navua, Fiji and in Dumbea, New Caledonia.

 

The last earthquake of M>=7.8 west of the IDL within about 500 km of this epicenter occurred beyond the limits of historical records. There have been no such earthquakes listed in the area in the past making this an unprecedented event. Forecast 119647 had expected today's event was likely within about 50 km of this epicenter around September 7.

 

O: 06SEP2018 23:39:27  17.7S  179.7E mb=4.3  EMSC   FIJI

O: 06SEP2018 16:43:18  17.9S  179.6W mb=4.9  EMSC   FIJI REGION

O: 06SEP2018 12:06:55  18.0S  177.8W mb=4.7  EMSC   FIJI REGION

O: 06SEP2018 23:55:39  18.0S  179.8W mb=4.5  EMSC   FIJI REGION

O: 06SEP2018 17:59:15  18.1S  178.1W mb=4.5  EMSC   FIJI REGION

O: 07SEP2018 05:10:13  18.1S  178.1W mb=5.2  EMSC   FIJI REGION

O: 06SEP2018 18:13:48  18.1S  179.0E mb=4.6  EMSC   FIJI

O: 06SEP2018 16:31:33  18.1S  179.7W mb=5.5  EMSC   FIJI REGION

O:  6SEP2018 15:49:15  18.5S  179.4E Mw=7.8  EMSC   FIJI                         

O:  6SEP2018 18:22:23  19.1S  179.5E mb=4.6  EMSC   SOUTH OF FIJI ISLANDS        

P:  7SEP2018 119647    18.0S  179.0E 4.0-6.6 AAAAA  Fiji Islands               

 

An M 6.2 earthquake at 102-103 degrees from the Fiji quake struck Ecuador hours after the Fiji quake. Seismic energy from major earthquakes reflects and refracts off inner earth boundaries and is directed back to the surface where it concentrate in the area near 100-103 degrees from the epicenter. The exact distance where this arrives back on the surface is dependent on the depth of the original and subsequent quake. Seismicity in this distance zone is often see to increase after such major events and probably represents seismic triggering. NEIC reported it was felt in Ecuador with maximum intensity VI in Guaranda, Bolivar, Ecuador and V in Alausi, Chimborazo, La Troncal, Canar and Cuenca, Azuay, Guayaquil, Satna Lucia, Puebloviejo, Playas, Guayas, with intensity IV in Ecuador as far as 300 km from the epicenter at Manta, Quito, Tosagua, Portoviejo, Loja, Pelileo, Eloy Alfaro, Sucua, and Riobamba, Ecuador. It was also felt with intensity IV in Peru at Tumbes, Santa Rosa and within about 500 km of the epicenter. Minor damage may have occurred with this earthquake in Ecuador. The last earthquake in Ecuador of M>=6.2 within about 250 km of this epicenter occurred  August 12, 2011 with M 7.1. A quake of M 6.2 on August 12, 2013 was about 400 km southwest of today's epicenter. Forecast 119444 had expected today's epicenter could see a moderate to large quake around September 5.

 

O:  7SEP2018 02:12:07   2.2S   78.8W Mw=6.2  EMSC   ECUADOR                      

P:  5SEP2018 119444     2.0S   78.0W 4.0-5.7 AAAAA  Ecuador                    

 

 

An earthquake of M 5.8 also occurred in Central Chile today. NEIC reported it was felt with intensity IV in Vallenar and Copiapo, Atacama and in Coquimbo at Vicuna and La Serena and in Mendoza, Argentina. No major damage or casualties were reported with this earthquake but minor damage may have occurred. Like the event in Ecuador this epicenter is at 100-103 degrees from the Fiji quake and may have been triggered by energy from that event. This follows an M 5.2 in the region on August 28, 2018, a possible foreshock. It is the strongest within about 200 km of this epicenter since an M 6.9 on November 11, 2015.

Forecast 119663 had expected this quake was possible within about 100 km of the epicenter around September 7.

 

O:  7SEP2018 02:39:16  28.9S   70.0W Mw=5.8  EMSC   ATACAMA, CHILE               

P:  7SEP2018 119663    29.0S   71.0W 4.0-5.6 AAAAA  Coast Central Chile        

 

An earthquake of M 5.6 also hit the border area of Panama and Colombia. NEIC reported it was felt with intensity IV in Panama at San Miguel and in Colombia at Envigado. Lesser shaking of II-III was felt in Panama at San Miguelito, Ancon, La Chorrera and Colombia at Turbo. The last earthquake within about 200 km of this epicenter with M>=5.6 occurred on August 18, 2018 with M 5.6. The last of larger magnitude occurred as an M 5.9 on July 29, 2015.  Forecast 119427 had expected this event within about 100 km of the epicenter was possible around September 7. The antipode is at 8S 102E south of Sumatra and may see a moderate quake in the next several days. This epicenter is at 105 degrees from the Fiji epicenter and may have been promoted from that source.

 

O:  7SEP2018 01:47:22   8.0N   77.6W mb=5.6  EMSC   PANAMA-COLOMBIA BORDER REGION

P:  7SEP2018 119427     7.0N   78.0W 4.0-6.0 AAAAA  Colombia                   

 

 

STRONG QUAKE DEADLY IN NORTHERN JAPAN

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 5, 2018

 

A strong earthquake of M 6.6 shook northern Japan and was felt strongly in  Hokkaido and Aomori, Japan. Intensity VII was reported in Hokkaido at Tomakomai, Chitose, Shizunai, Mombetsu, with IV in Ichinohe, Iwate and Sapporo and Eniwa, Hokkaido. Intensity IV-V in Hokkaido was felt in Furano, Otofuke, Iwanai, Asahikawa, Nanae, Hakadate, and in Aomori at Misawa and Towanda. Intensity II-III was reported from the prefectures of Fukui, Chiba, Miyagi, Akita, Iwate, and as far as 800 km form the epicenter. An aftershock of M 5.4 was widely felt in Hokkaido and Aomori with intensity II-IV in Sapporo, Hakodate and Misawa. Another M 5.3 was felt with intensity V in Kitahiroshima, Hokkaido. JMA and the Japanese government reported at least 7 were killed in today's event and 290 injured. At least 30 are still missing and feared dead under massive mud and earth-slides. More than 2.9 million lost power. Communications, air, rail and ground traffic were disrupted.

 

The earthquake in Hokkaido was expected at this time as a result of unloading atmospheric pressure associated with the passage of Super-Typhoon Jebi over the area at this time. In the previous summary it was noted that an M 5.8  off the coast of Honshu was also associated with this storm as:

 

"A moderately large earthquake also occurred off the east coast of Honshu, Japan today. It was felt with intensity V in Hitachi, Ibaraki and II-IV in Ibaraki at Oarai, Mito, Naka, Ishige and in Narita and Kamagaya, Chiba; Oyama, Tochigi, in Chiba at Narashino, Funabashi, Urayasu; in Nihommatsu, Fukushima; in Saitama at Koshigaya, Soka, as well as in Tokyo, Gunma, Miyagi and Shizuooka and Kanagawa Prefectures, Japan. This was expected in previous issues of this summary as an earthquake triggered by the passage of Typhoon Jebi, the strongest to hit Honshu in 25 years as:

 

"Super-Typhoon Jebi made landfall in Honshu, Japan today. This is the strongest typhoon to hit Honshu in the past 25 years. At least eight were killed in Fukui Prefectures. Flooding accompanied  shipping, train and air service. At least 1.6 million homes were without power. This summary had expected this landfall as:

 

"Jebi is then expected to turn to the north and hit Honshu, Japan around September 4 where this super-typhoon could help promote a strong to major earthquake in early September." (September 2-3, 2108)

 

Seismicity in and near Honshu, Japan is likely to include a moderate to strong quake in the next several days" (September 4-5, 2018)

 

Today's earthquake of M 6.6 is the strongest in Hokkaido within about 200 km  of this epicenter since an M 6.7 on January 14, 2016 and an M 6.9 on February 2, 2013. The only other such event in the past 15 years was an M 6.8 on September 11, 2008. Forecast 119272 had expected this event was likely at the end of August or in early September in this area.

 

The event of September 11, 2008 was probably triggered by a tropical storm (16W). This summary noted this at the time as:

 

 

"TS 16W continued today in the area southeast of Honshu, Japan with winds of 35 kts. It is expected to move to the northwest hitting the area near Tokyo as a typhoon around September 12. A similar typhoon hit Tokyo on Sept. 1, 1923 and was accompanied by the last great earthquake in that area. A great quake is now considered overdue in the area. It is likely that such an event will be triggered by a passing typhoon such as this one. A seismic watch is being called for Japan with likely increases of +1.5 magnitude units for the largest events." (September 10, 2008)

 

Today's activity is located at the third node (120 degrees) from the M 7.3 quake in Venezuela of August 21 and at the fifth node (72 degrees) from the M 8.2 in Fiji of August 19 and was probably promoted from those sources.

 

O: 05SEP2018 20:20:48  42.6N  142.0E mb=4.3  EMSC   HOKKAIDO, JAPAN REGION

O: 06SEP2018 05:04:00  42.7N  141.9E mb=4.7  EMSC   HOKKAIDO, JAPAN REGION

O: 05SEP2018 18:20:12  42.7N  141.9E mb=5.3  EMSC   HOKKAIDO, JAPAN REGION

O: 05SEP2018 21:11:31  42.7N  142.0E Mw=5.3  EMSC   HOKKAIDO, JAPAN REGION

O: 05SEP2018 21:04:33  42.7N  142.0E mb=4.6  EMSC   HOKKAIDO, JAPAN REGION

O: 05SEP2018 19:10:49  42.8N  142.0E mb=4.8  EMSC   HOKKAIDO, JAPAN REGION

O:  5SEP2018 22:45:51  42.9N  141.9E mb=4.7  EMSC   HOKKAIDO, JAPAN REGION       

O: 05SEP2018 18:08:00  42.7N  142.1E Mw=6.6  EMSC   HOKKAIDO, JAPAN REGION

P: 25AUG2018 119272    41.0N  141.0E 3.5-6.1 CBAAA  Hokkaido, Japan            

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in the continuing aftershocks on the north slope, Alaska. It was accompanied by six other aftershocks of M>=3. The area has seen daily seismicity in this range since earthquakes of M 6.4 and M 6.1 on August 12. The last of M>=4 occurred on September 1 with M 4.8 and August 28, 2018 with M 4.0.  Forecast 119350 had expected today's activity was likely at the end of August or early September.

 

O: 05SEP2018 18:49:50  69.5N  144.1W Ml=3.0  EMSC   NORTHERN ALASKA

O: 05SEP2018 10:32:02  69.5N  144.3W ML=3.3  EMSC   NORTHERN ALASKA

O: 05SEP2018 11:45:28  69.6N  144.1W ML=3.3  EMSC   NORTHERN ALASKA

O: 05SEP2018 08:01:43  69.6N  144.1W Ml=3.0  EMSC   NORTHERN ALASKA

O: 06SEP2018 04:48:22  69.6N  144.2W Ml=3.3  EMSC   NORTHERN ALASKA

O: 06SEP2018 04:05:11  69.6N  145.4W ML=4.0  EMSC   NORTHERN ALASKA

O:  6SEP2018 00:13:28  69.3N  146.7W Ml=3.0  EMSC   NORTHERN ALASKA              

P: 27AUG2018 119350    69.3N  144.8W 3.0-5.0 CAAAA  Northern Alaska            

 

 

NUSUAL EARTHQUAKE OF M 5.4 RECORDED IN URAL MOUNTAINS, RUSSIA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 4, 2018

 

An unusual earthquake of M 5.4 hit in the Ural Mountains of Russia today. NEIC reported it was felt with intensity II-III in Russia at Perm and Ufa, Baskortostan.  The last earthquake within about 300 km of this epicenter in the Ural Mountains with M>=5.4 was an M  5.6 on June 25, 1970. The only other such event recorded within about 400 km of this epicenter with M>=5.4 was an M 5.5 on August 18, 2014. The event in June, 1970 occurred within about 10 seconds of the hour and may have been an unannounced nuclear test. The event in August 1914 was also within three minutes of 05:00 UT but an alternative explanation for that event is not readily available.

 

O:  4SEP2018 22:58:18  54.7N   58.1E mb=5.4  EMSC   URAL MOUNTAINS REGION, RUSSIA

 

A moderately large earthquake also occurred off the east coast of Honshu, Japan today. It was felt with intensity V in Hitachi, Ibaraki and II-IV in Ibaraki at Oarai, Mito, Naka, Ishige and in Narita and Kamagaya, Chiba; Oyama, Tochigi, in Chiba at Narashino, Funabashi, Urayasu; in Nihommatsu, Fukushima; in Saitama at Koshigaya, Soka, as well as in Tokyo, Gunma, Miyagi and Shizuooka and Kanagawa Prefectures, Japan. This was expected in previous issues of this summary as an earthquake triggered by the passage of Typhoon Jebi, the strongest to hit Honshu in 25 years as:

 

"Super-Typhoon Jebi made landfall in Honshu, Japan today. This is the strongest typhoon to hit Honshu in the past 25 years. At least eight were killed in Fukui Prefectures. Flooding accompanied  shipping, train and air service. At least 1.6 million homes were without power. This summary had expected this landfall as:

 

"Jebi is then expected to turn to the north and hit Honshu, Japan around September 4 where this super-typhoon could help promote a strong to major earthquake in early September." (September 2-3, 2108)

 

Seismicity in and near Honshu, Japan is likely to include a moderate to strong quake in the next several days" (September 4, 2018)

 

The last earthquake near Honshu within about 150 km of today's epicenter with

M>=5.8 occurred on July 20, 2017 with M 5.8 about 100 km north of this epicenter. The last of larger magnitude was an M 6.9 on November 21, 2016.  Forecast 119224 had expected today's earthquake was likely in early September. This epicenter is located at the third node (120 degrees) from the M 7.1 in Brazil of  August 24 and the M 7.1 in Loyalty Islands of August 29 and may have been promoted from those sources.

 

O:  4SEP2018 20:11:20  36.5N  141.4E mb=5.8  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 31AUG2018 119224    36.0N  140.0E 4.0-6.0 BAAAA  Off East Coast Honshu      

 

As expected in this summary seismicity in the South Sandwich Islands continued at high levels today. The largest were of M 5.4 (two) and M 5.2 (two). These appear to be aftershocks of the M 5.7 at this epicenter of September 3. Forecast

119420 expected this activity was likely at the end of August or early September. None of today's earthquakes were reported felt in the area.

 

O: 04SEP2018 13:32:31  58.1S   25.4W mb=5.0  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 04SEP2018 14:37:52  58.1S   25.6W mb=5.2  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 05SEP2018 00:43:12  58.3S   25.0W mb=5.0  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 05SEP2018 05:09:37  58.4S   24.8W mb=5.2  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 05SEP2018 00:36:22  58.4S   24.9W Mw=5.4  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 05SEP2018 00:50:13  58.4S   24.9W mb=4.7  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 04SEP2018 18:38:02  58.4S   24.9W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

O:  5SEP2018 03:33:11  58.5S   24.9W Mw=5.4  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 27AUG2018 119420    58.0S   26.0W 4.0-6.4 CAAAA  So. Sandwich Islands       

 

An unusual earthquake of M 3.2 also occurred today in eastern Texas. NEIC reported it was felt with intensity IV in Texas at Timpson and II-III in Garrison, Gary, Mount Enterprise, Carthage and Nacogdoches, Texas. It was also reported felt in Mississippi at Natchez and Ocean Springs. It occurred as Hurricane Gordon was making landfall in the region of Mississippi and may have been promoted by stresses from that storm as noted in previous issues of this summary:

 

 

"Tropical Storm Gordon (Cyclone 7E) continued today in the Gulf of Mexico with winds up to 65 kts. It is expected to track to the northwest making landfall near New Orleans, Louisiana as a hurricane around September 5. It may enhance seismicity in eastern Mexico over the next several days. It is expected to trigger major rainfall on the Gulf coast of the U.S. with up to 10 inches in Mississippi, Southern Florida and Alabama." (September 3-4, 2018)

 

The last earthquake within about 150 km of this epicenter in eastern Texas with

M>=3.2 occurred on September 2, 2013 with M 4.3. Forecast 119253 expected this event to the northwest was likely at the end of August or in early September. Today's event is located at 143 from Lombok, Indonesia and may have been promoted by concentrated energy from that source.

 

O:  4SEP2018 15:06:46  32.0N   94.5W mb=3.2  EMSC   EASTERN TEXAS                

P: 29AUG2018 119253    35.0N   96.0W 2.0-5.1 BCAAA  Southern Plains            

 

CAYMAN ISLANDS; PORTUGAL SEE UNUSUAL EARTHQUAKES

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 3, 2018

 

An unusual earthquake of M 4.7 hit the Cayman Islands in the Gulf of Mexico today. This is the strongest earthquake within about 250 km of this epicenter since an M 5.8 on November 16, 2015. It was probably promoted by stresses  from Tropical Storm Gordon which passed north of this epicenter about the time of this event. This had been expected in previous summaries as:

 

"Tropical Cyclone 7E (Gordon) formed today north of Cuba with winds up to 30 kts. It is expected to track to the northwest making landfall near New Orleans, Louisiana as a tropical storm around September 5. It may enhance seismicity in eastern Mexico over the next several days." (September 2-3, 2018)

 

Forecast 119139 had expected this quake about 150 km to the northwest was likely around August 28. This epicenter is located at 103 degrees from the M 8.2 in the Fiji Islands of August 19 and was probably promoted by concentrated seismic energy from this event.

 

O:  3SEP2018 14:35:03  18.0N   79.6W mb=4.7  EMSC   CAYMAN ISLANDS REGION        

P: 28AUG2018 119139    19.0N   81.0W 3.5-5.7 BAAAA  Caribbean Sea              

 

The strongest earthquake of the day was an M 5.7 in the South Sandwich Islands region. This area has been active since mid-August when an M 6.1 and 5.5 hit the region on August 14. Today's unfelt quake was probably an aftershock, the strongest to date of the August 14  with M 6.1. This activity in the South Sandwich Islands is expected to continue for several more days. Forecast 119420 had expected this event within about 50 km of the epicenter was likely at the end of August or early September. Like the activity in the Cayman Islands these events are located at 101-103 degrees from the M 8.2 in the Fiji Islands of August 19 and are probably being promoted from that source.

 

O:  3SEP2018 20:47:59  58.0S   25.3W mb=4.7  EMSC   SOUTH SANDWICH ISLANDS REGION

O:  3SEP2018 20:35:49  58.1S   25.3W mb=5.7  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 27AUG2018 119420    58.0S   26.0W 4.0-6.4 CAAAA  So. Sandwich Islands       

 

Super-Typhoon Jebi made landfall in Honshu, Japan today. This is the strongest typhoon to hit Honshu in the past 25 years. At least eight were killed in Fukui Prefecture. Flooding accompanied  problems with shipping, train and air service. At least 1.6 million homes were without power. This summary had expected this landfall as:

 

"Jebi is then expected to turn to the north and hit Honshu, Japan around September 4 where this super-typhoon could help promote a strong to major earthquake in early September." (September 2-3, 2108)

 

Seismicity in and near Honshu, Japan is likely to include a moderate to strong quake in the next several day, but this event did not occur today.

 

An earthquake of M 4.8 hit off the western coast of Portugal today. NEIC reported this earthquake of M 4.8 NW of Portugal  was felt with intensity IV in Portugal at Canedo, Vila  Nova de Gaia, Porto and Baguim do Monte, Norte, Portugal. in the area(s) of The antipode of this epicenter is located in the Cook Strait between North and South Island, New Zealand. Some sympathetic seismicity in North or South Island New Zealand may follow this event in Portugal in the next several days. Great earthquakes such as the Lisbon quake of November 1, 1755 (M 8.0) and several in the late 1960's can occur west of Portugal in this tectonic regime and can be accompanied by tsunamis. This is the strongest earthquake within  about 200 km of this epicenter in at least 30 years. An M 4.8 last hit about 300 km southwest of this on July 26, 2007. Forecast 119298 expected activity in this region in late August.

 

O:  4SEP2018 06:29:24  40.2N   10.3W ML=2.7  EMSC   NORTH ATLANTIC OCEAN          

O:  4SEP2018 06:12:56  40.2N   10.4W ML=4.8  EMSC   NORTH ATLANTIC OCEAN         

P: 24AUG2018 119298    43.0N    9.0W 3.0-5.3 CCBAA  Portugal                   

 

MODERATE QUAKES IN MARIANA IS; NEW BRITAIN, NEW IRELAND ON QUIET DAY

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 2, 2018

 

The strongest earthquakes in the world today occurred in New Britain and New Ireland and the Mariana Islands with M 5.2 and M 5.1 and M 5.3. These events were not reported felt in these remote areas. The rest of the world was at relatively quiet seismic conditions today. The strongest earthquake today occurred in the central Mariana Islands of M 5.3 occurred after Super Typhoon Jebi passed over this epicenter several days ago. This summary had expected this storm-related activity as:

 

 

"Super-Typhoon Jebi (TD 25W) continued today over the central Mariana Islands with winds up to 180 kts. It is expected to track to the northwest reaching the Mariana and Volcano Islands around August 31. Seismicity is expected to be enhanced in these regions as Typhoon Jebi passes through the region. A strong event of M 6.4 in the central Mariana Islands occurred as Jebi was bearing down on the islands. Jebi is then expected to turn to the north and hit Honshu, Japan around September 4 where this super-typhoon could help promote a strong to major earthquake in early September." (August 31, 2018)

 

The M 5.3 in the Mariana Islands is the strongest within about 200 km of that epicenter since the M 6.4 of August 28 about 150 km to the southwest and may be a regional aftershock of that event.  Forecast 119159 had expected today's event was likely at the end of August within about 50 km of this epicenter.

 

O:  3SEP2018 00:58:39  17.5N  147.5E mb=5.3  EMSC   MARIANA ISLANDS REGION       

P: 29AUG2018 119159    17.0N  147.0E 4.0-6.1 BAAAA  No. Marianas               

 

O:  2SEP2018 17:56:42   7.0S  155.4E Mw=5.1  EMSC   BOUGAINVILLE REGION, P.N.G.  

P: 30AUG2018 119132     7.0S  156.0E 4.0-6.0 AAAAA  Solomon Islands            

 

O:  3SEP2018 02:16:19   3.9S  150.2E mb=5.2  EMSC   NEW IRELAND REGION, P.N.G.   

P: 28AUG2018 119123     3.0S  149.0E 4.0-6.0 BAAAA  New Ireland                

 

A second light earthquake of M 3.4 shook the San Francisco Bay area of California today following an M 3.3 north of this yesterday. NEIC reported today's event was felt with intensity II-III in Milpitas, San Jose, Fremont, Sunol, Santa Clara, Mount Hamilton, Sunnyvale, Livermore, Pleasanton, Newark, Mountain View, Union City, Campbell, Palo Alto, Hayward, Los Altos, Dublin, and as far as San Francisco within about 70 km of the epicenter. The last earthquake within about 50 km of this epicenter with M>=3.4 occurred on April 16, 2018 with M 3.8.  Forecast 119201 had expected today's event at the end of August within about 10 km of today's epicenter. This epicenter is located at the third node (120 degrees) from the Lombok, Indonesia activity and may have been promoted from that source.

 

O:  3SEP2018 02:10:12  37.5N  121.8W Mw=3.4  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 28AUG2018 119201    37.4N  121.8W 2.5-4.8 BAAAA  Central California         

 

An unusual earthquake of M 4.3 hit under the North Atlantic Ocean east of Newfoundland, Canada today. This is a remote area and this event was not reported felt. It was the largest quake in or near Canada or the U.S. today however. The last earthquake within about 250 km of this epicenter with M>=4.3 on March 29, 2013 with M 4.3. The only such earthquake in the area of greater magnitude in the past 30 years was an M 4.5 on November 18, 2008.

 

O:  3SEP2018 01:43:02  50.3N   50.4W mb=4.3  EMSC   NORTH ATLANTIC OCEAN         

NORTHERN CALIFORNIA ACTIVE

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 1, 2018

 

An M 3.3 occurred today in the area of the San Francisco Bay, California. NEIC reported it was felt with intensity IV in California at Crockett, Port Costa, Vallejo, Rodeo, Benicia, Fairfield, and Fremont, California. Lesser shaking of II-III was felt within about 60 km of the epicenter. Among those communities reporting intensity II-III in California included Belmont, Byron, Burlingame, Santa Rosa, Petaluma, San Francisco, Vacaville, Fairfax, Alameda, Oakland, Danville, Alameda, San Anselmo, Larkspur, Greenbrae, Novado, Alamo, San Rafael, Pittsburg, Emeryville, Walnut Creek, Suisun City, Berkeley, Orinda, Napan, Lafayette, Concord, Richmond, Pleasant Hill, Richmond, El Cerrito, San Bablo, American Canyon, El Sobrante, Martinez, Vallejo, Pinole, and Hercules, California. The last event in the San Francisco Bay area within about 50 km of this epicenter was an M 3.7 on July 30, 2018. Only one such event hit the area in 2017 - an M 3.8 on April 30, 2017. This changed with an M 4.4 on January 4, 2018 which was the first of 6 such events in the past eight months, the last of which was an M 3.7 on July 30, 2018. Forecast 119202 had expected today's event around August 29.

 

O:  1SEP2018 17:15:10  37.6N  122.0W MD=2.1  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O:  2SEP2018 00:27:54  38.1N  122.2W Mw=3.3  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 29AUG2018 119202    37.8N  122.6W 2.5-4.8 AAAAA  Central California         

 

An earthquake of M 3.8 also occurred today in the region of the Geysers, California. NEIC reported this earthquake of M 3.8 in the Geysers, California was felt with intensity IV in Kelseyville, Middletown and II-III in the area(s) of Healdsburg, Lower Lake, Lakeport and Calistoga among other area of California. Forecast 119203 had expected this event was likely around August 29. Two earthquakes of larger magnitude have occurred in the area in the past year - an M 4.2 on May 10, 2018 and and M 4.2 on May 10, 2018. Forecast 119203 had expected today's event around August 29.

 

O:  1SEP2018 08:43:53  38.4N  122.4W MD=2.3  EMSC   NORTHERN CALIFORNIA          

O:  1SEP2018 15:47:25  38.8N  122.8W MD=2.2  EMSC   NORTHERN CALIFORNIA          

O:  1SEP2018 15:45:06  38.8N  122.8W Mw=3.8  EMSC   NORTHERN CALIFORNIA          

P: 29AUG2018 119203    38.5N  122.7W 2.5-5.4 AAAAA  Central California         

 

The M 3.3 in San Francisco followed the second strongest earthquake of the day - an M 5.3 in the aftershock sequence in Lombok, Indonesia and is separated by 120 degrees on the earth's surface from it. p-dif waves from Indonesia would have been in the San Francisco vicinity at the time of the M 3.3 there and may have helped promote that unusually large event. This event was expected in forecast 119134 to occur around August 29.

 

NEIC reported this earthquake of M 5.3 in Lombok, Indonesia was felt with intensity II-III in the area(s) of Bali at Ubud and Kuta, Indonesia.

 

O:  2SEP2018 00:15:45   8.1S  116.4E Mw=5.3  EMSC   LOMBOK REGION, INDONESIA     

P: 29AUG2018 119134     8.0S  117.0E 4.0-5.8 BAAAA  Sumbawa Island area        

 

The strongest earthquake in the world today was an M 5.6 in the Bonin Islands of southeastern Japan. It was accompanied by moderate quakes in the Izu and Ryukyu Islands. The Bonin Islands quake was deep and was not reported on the surface.

It is the strongest quake in the Bonin Islands in the past year at least. Forecast 119173 had expected this event within about 100 km of the epicenter in the Bonin Islands at the end of August. It was probably promoted by stresses associated with  Super-Typhoon Jebi which was passing to the south at the time of the Bonin Islands earthquake as noted in this summary:

 

"Super-Typhoon Jebi (TD 25W) continued today west of the Volcano Islands with winds up to 140 kts. Seismicity is expected to be enhanced in these regions as Typhoon Jebi passes through the region. A strong event of M 6.4 in the central Mariana Islands occurred as Jebi was bearing down on the islands. Jebi is then expected to turn to the north and hit Honshu, Japan around September 4 where this super-typhoon could help promote a strong to major earthquake in early September. An earthquake of M 5.8 occurred in the Bonin Islands as this storm was passing through the area." (September 1, 2018)

 

O:  1SEP2018 15:43:02  28.0N  139.9E Mw=5.6  EMSC   BONIN ISLANDS, JAPAN REGION  

P: 29AUG2018 119173    27.0N  140.0E 4.0-6.1 AAAAA  Bonin Islands              

 

The strongest earthquake in the U.S. or Canada today was an M 5.0 in the Andreanof Islands, the latest aftershock since events of M 6.6 on August 15 and M 6.3 on August 23. An M 5.2 also hit the region on August 17. Today's event was not reported felt in this epicentral area. Forecast 119315 had expected this event was likely around August 29.

 

O:  1SEP2018 14:33:11  51.3N  177.7W ML=3.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O:  1SEP2018 15:48:57  51.3N  177.7W ML=3.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O:  1SEP2018 14:23:25  51.5N  177.8W mb=5.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 29AUG2018 119315    50.8N  179.5W 3.5-5.7 AAAAA  Andreanoff Isls, Aleutians 

 

MODERATE QUAKE SHAKES CENTRAL PHILIPPINES

 

EARTHQUAKE SUMMARY FOR AUGUST 31, 2018

 

The strongest earthquake in the world today was an M 5.5 in Southern Tagalog, Philippines. It was reported by NEIC to have been felt with IV in Balytiui, Dasmarinas, Southern Tagalog and II-III in Puerto Galera, Santa Clara, Kinalaglagan, Naic, Cainta and Olongapo, Philippines. PHIVOLCS reported it was felt with intensity IV in Abra De Ilog, Occidental Mindoro; Puerto Galera, Oriental Mindoro; III in Looc, Lubang, Mamburao, Sta. Crz and Sablayan, Occidental Mindoro, San Teodoro and Baco, Oriental Mindoro; II in Pasig City, Quezon City; Gloria, Socorro, Pola, Naujan, Roxas and Calapan City, Oriental Mindoro and I in Manila City, Pasay City, Muntinlupa City; Tagaytay City, Philippines. The last earthquake within about 200 km of this epicenter with M>=5.5 occurred on August 11, 2017 with M 6.2. Both were at intermediate focal depths reducing felt and damage effects at the surface but also extending the felt cone on the surface. Forecast 119152 expected a moderate to strong quake in this area at the end of August. This event occurred within about an hour of local solar midnight on the geomagnetic equator and was probably promoted by geomagnetic and tidal stresses. This epicenter is at the sixth node (60 degrees) from recent activity in  the Loyalty Islands including the M 7.1 of August 29 and probably was promoted from that source.

 

O: 31AUG2018 14:40:27  13.6N  120.7E MS=5.2  PHI  Felt with intensity IV

O: 31AUG2018 14:40:29  13.6N  120.9E Mw=5.5  EMSC   MINDORO, PHILIPPINES         

P: 27AUG2018 119152    17.0N  120.0E 3.5-5.6 BCAAA  Luzon, Philippines         

 

An earthquake of M 5.1 in Chile was felt with intensity VI in Valparaiso at Quillota, Quilpue, Valparaiso, V in Vina del Mar; and II-III in Villa Alemana, Santiago, Chile and in Mendoza, Argentina. CSN reported this earthquake was felt with intensity  V in  Valparaiso at Los Andes, San Felipe; IV in La Ligua, Puchuncavi, Quillota, Zapallar and III in Valparaiso; Santiago with IV in Solina and II in Santiagol O'Higgins with IV in Navidad, and in Coquimbo with V in Salamanca; IV in Combarbala and III in Coquimbo and La Serena, Chile.

An earthquake of M 5.2 hit the area of Coquimbo north of this epicenter on August 28 but the last of larger magnitude within about 100 km was an M 6.2 on April 10, 2018. Forecast 119401 expected this earthquake within about 100 km of this epicenter was likely around August 29.

 

O: 31AUG2018 10:26:43  31.8S   70.8W mb=4.3  EMSC   COQUIMBO, CHILE               

O: 31AUG2018 13:25:00  32.2S   70.4W Mw=5.1  EMSC   COQUIMBO, CHILE              

O: 31AUG2018 13:25     32.2S   70.5W mb=5.1  GUC    Valparaiso at Los Andes, San F

P: 29AUG2018 119401    32.0S   72.0W 4.0-6.1 AAAAA  Central Chile               

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in northern Alaska in the swarm which has persisted in the region since an M 6.4 on August 12. It was not reported felt in the region. The last event of M>=4.7 in this series occurred on August 13, 2018 (M 4.8). Today's event is the largest long-term aftershock following the immediate aftershocks of August 12 to date.

 

Forecast 119350 had expected today's activity up to M 5.0 was likely around August 27.

 

O:  1SEP2018 02:27:56  69.5N  144.1W ML=3.4  EMSC   NORTHERN ALASKA              

O:  1SEP2018 06:41:18  69.7N  145.1W mb=4.7  EMSC   NORTHERN ALASKA              

P: 27AUG2018 119350    69.3N  144.8W 3.0-5.0 BAAAA  Northern Alaska            

 

An earthquake of M 5.5 also hit the mid-Indian Ridge. It was not reported felt in this oceanic region. The last earthquake within about 250 km of this epicenter with M>=5.5 occurred on March 26, 2009 with M 5.7. No earthquakes of M>=5.5 have occurred within about 200 km of today's event in the past 30 years.

The event occurred within about an hour of local solar noon and may have

been promoted by tidal effects which maximize near this hour. The antipode of this epicenter is at 29N 105W, an area of northern Mexico which could see some sympathetic antipodal triggering in the next several days.

 

O:  1SEP2018 06:13:48  29.0S   74.5E Mw=5.5  EMSC   MID-INDIAN RIDGE             

O:  1SEP2018 05:57:52  29.0S   74.5E mb=4.9  EMSC   MID-INDIAN RIDGE             

 

MODERATE QUAKE SHAKES GREECE

 

EARTHQUAKE SUMMARY FOR AUGUST 30, 2018

 

An earthquake of M 5.1 in central Greece was widely felt today. NEIC reported intensity IV in Greece at Kardista, Sivota, Thesprotia, with lesser shaking of II-III within about 150 km of the epicenter reported in Grece at Karousades, Kokkinion, Ipsos, Kerkira, Parga, Nidrion, Leukas, Vonitsa and Anatoli.

The last earthquake in the region of Greece within about 150 km of this earthquake with M>=5.1 occurred on October 16, 2016 with M 5.1 in an aftershock sequence following an M 5.5 on October 15, 2016 about 150 km to the northwest of today's epicenter. Forecast 119219 had expected today's event within about 50 km was likely around August 27. It is located near 103 degrees from the strong M 7.1 in the Loyalty Islands and may have been promoted from that source.

 

O: 31AUG2018 07:12:24  39.3N   21.6E Mw=5.1  EMSC   GREECE                       

P: 27AUG2018 119219    39.0N   22.0E 3.0-5.2 BAAAA  No. Greece                 

 

The strongest quake in the world today was an M 5.5-5.6 aftershock in the area southeast of the Loyalty Island where an M 7.1 shook on August 29. Forecast  119385 expected today's event within about 100 km of the epicenter at the end of August.

 

O: 31AUG2018 04:26:30  21.2S  168.5E Mw=5.2  EMSC   LOYALTY ISLANDS              

O: 30AUG2018 17:14:40  22.2S  170.2E mb=4.9  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

O: 30AUG2018 16:24:48  22.2S  170.2E mw=5.6  ANSS   Ile Hunter New Caledonia

O: 30AUG2018 16:24:47  22.2S  170.3E Mw=5.5  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 31AUG2018 119385    21.0S  169.0E 4.0-6.2 ABAAA  Loyalty Islands            

 

The strongest earthquake in the U.S. or Canada outside Alaska today was an M 3.8 near Tahoe, Nevada. NEIC reported maximum intensity IV in Tahoe Vista with intensity II-III in Carnelian Bay, Kings Beach, Olympic Valley, Truckee, Tahoe City, South Lake Tahoe, Norden, Forest Hill, Pollock Pines, Dutch Flat, Georgetown, Gold Run, Nevada City, Grass Valley, Colfax, Cmino, Downieville, Garden Valley, Placerville, Applegate, Auburn, Rescue, Shingle Springs, Granite Bay, Rocklin, Roseville, Oroville, Yuba City, Sacramentio, Magalia, California and in Nevada at Incline Village, Reno, Carson City, Glenbrook, Sparks, Gardnerville, and in general within about 150 km of the epicenter. This epicenter is located at 103-104 degrees from the M 6.1 and aftershocks in western Iran of August 25. This summary had noted this in previous issues and placed this area of California under a moderate seismic watch through the end of August as follows:

 

These earthquakes are located around 103-106 degrees from Central California north to the area off the coast of Oregon. An M 6.2 off the coast of Oregon on August 22 is located at 102-103 degrees from these epicenters in Iran and probably helped promote this activity at this time. Small aftershock off Oregon today may have been enhanced by energy from the Iranian quakes as well. This effects has been previous named "seismic ping pong" in this summary and occurs when one large quake helps trigger another and that in turn helps trigger secondary shocks in the first zone etc. The area from central California to west of Oregon is being placed under a precautionary seismic watch for the next four days  through the end of August. A moderate quake is considered possible in the area in this time period." (August 26, 2018)

 

This is the strongest earthquake within about 75 km of the epicenter since June 27, 2017 (M 4.0) and prior to that an M 4.3 on December 23, 2015.  Forecast 119290 had expected this event in this area was likely around August 30.

 

O: 30AUG2018 22:08:09  39.2N  120.1W Mw=3.8  EMSC   NORTHERN CALIFORNIA          

O: 30AUG2018 13:44:57  39.3N  120.0W ML=2.0  EMSC   NEVADA                       

P: 30AUG2018 119290    40.0N  120.9W 2.5-5.2 AAAAA  Northern California        

 

An earthquake of M 3.8 also shook areas of Kansas near Harper today. NEIC reported maximum intensity V in Harper, Kansas and IV in Norwich, Milton, Kingman, Pratt, with II-III shaking as far as about 100 km from the epicenter in Kansas at Hesston, Wichita, Derby, Colwich, Viola and Anthony. A number of lighter aftershocks were felt in the Harper, Kansas area. The last earthquake within about 100 km of this epicenter in Kansas was an  M 4.0 on November 9, 2015 and prior to that an M 4.0 on June 5, 2015.  Forecasts 119253 and 119255 had expected this activity was likely at the end of August.

 

O: 30AUG2018 22:56:13  37.3N   97.9W ml=1.6  ANSS   ENE of Harper Kansas

O: 30AUG2018 22:03:46  37.3N   97.9W ml=1.7  ANSS   ENE of Harper Kansas

O: 30AUG2018 21:56:44  37.3N   97.9W ml=1.7  ANSS   ENE of Harper Kansas

O: 31AUG2018 04:52:32  37.3N   97.9W mb=2.4  EMSC   KANSAS                       

O: 31AUG2018 06:20:04  37.3N   97.9W mb=2.5  EMSC   KANSAS                       

O: 30AUG2018 20:37:08  37.3N   97.9W mb=3.8  EMSC   KANSAS                       

O: 31AUG2018 01:08:58  37.4N   97.9W mb=2.2  EMSC   KANSAS                       

O: 31AUG2018 07:15:27  37.4N   97.9W mb=2.2  EMSC   KANSAS                        

O: 31AUG2018 04:55:21  37.4N   97.9W mb=2.3  EMSC   KANSAS                       

O: 30AUG2018 23:34:19  37.4N   97.9W mb=2.5  EMSC   KANSAS                       

O: 31AUG2018 04:44:30  37.4N   98.0W mb=3.0  EMSC   KANSAS                        

P: 25AUG2018 119255    38.0N   98.0W 2.0-4.3 AAAAA  Southern Plains            

P: 31AUG2018 119253    37.0N   97.0W 2.0-5.3 AAAAA  Southern Plains            

 

The strongest earthquakes in the U.S. or Canada today were a pair of events of M 4.5 and 4.7 in the Fox Islands. They were not reported felt in the epicentral area which is remote. They may be regional aftershocks of an M 5.9 about 150 km to the west which  occurred on August 25. The last event within about 100 km of these epicenters with M>=4.7 was an M 5.1 on January 28, 2018. Forecast 119316 had expected this activity around August 31.

 

O: 31AUG2018 02:47:25  52.7N  169.5W mb=4.5  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 31AUG2018 00:21:43  52.9N  169.6W mb=4.7  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 31AUG2018 119316    52.4N  170.7W 3.5-5.7 AAAAA  Andreanoff Isls, Aleutians 

 

The Fox Islands activity was closely associated with an antipodal earthquake in the area south of Africa of with M 4.9 about 11 minutes after the M 4.5 in the Fox Islands. It was located within about 200 km of exact antipode of that event and may have been tidally or geomagnetically promoted. Both occurred near times of maximum tidal stresses. The last event of M>=4.9 in the area southwest of Africa was an M 5.2 on February 11, 2018. Forecast 119419 had expected today's event was likely around August 30.

 

 

O: 31AUG2018 02:58:18  52.3S   14.2E mb=4.9  EMSC   SOUTHWEST OF AFRICA          

P: 30AUG2018 119419    53.0S   19.0E 4.0-6.2 AACAA  Atlantic-Indian Ridge      

 

MODERATE QUAKE SHAKES COSTA RICA; HIGH LATITUDES ACTIVE

 

EARTHQUAKE SUMMARY FOR AUGUST 29, 2018

 

An earthquake of M 5.4 hit Costa Rica today. NEIC reported it was felt with intensity V in Golfito, Puntarenas, Costa Rica and San Miguelito, Panama and IV in San Isidro, San Jose, Costa Rica. Lesser shaking of II-III was felt in Panama at Cerro Cama, Puerto Armuelles, Volcan, Palmira, Boquete, David and Almirante and in Costa Rica at San Juan, Alajuela, Mercedes, Santiago, San Rafael, Limon, and Puerto Cortes, Costa Rica.  No major damages or casualties were reported. The last earthquake in Costa Rica of M>=5.4 occurred August 17, 2018 with M 6.1. This is the strongest aftershock to date of that mainshock. That was the strongest in the area in at least three years. Forecast 119105 had expected today's event was likely around August 30. This epicenter is at 108 degrees from the Loyalty Islands M 7.1 of August 29 and may have been promoted from that source.

 

O: 29AUG2018 21:33:43   8.7N   83.0W Mw=5.4  EMSC   COSTA RICA                   

P: 30AUG2018 119105     9.0N   83.0W 3.5-6.1 AAAAA  Costa Rica                 

 

An earthquake of M 5.2 in the southeastern South Sandwich Islands today was nearly antipodal to the unusual M 5.6 in northwestern Kamchatka which occurred on August 27 as described in this report:

 

"The earthquake in Kamchatka was well to the north of normal activity in the region. It was not reported felt in this remote volcanic area. The last event within about 200 km of this epicenter in Kamchatka with M>=5.4 occurred on July 7, 1996 with M 6.4, the only such event in this area in at least 30 years. The earthquake occurred near local solar noon and may have been enhanced from tidal and geomagnetic effects. The geomagnetic storm reached KP 8 near the time of this earthquake which was at a high northern latitude.  Forecast 119323 expected activity in the area in late August. The epicenter in Kamchatka is at 103 degrees from the M 7.3 in Venezuela of August 21 and was probably promoted by concentrated energy from that source." (August 27, 2018)

 

O: 27AUG2018 03:19:00  58.7N  158.8E mb=5.4  EMSC   KAMCHATKA PENINSULA, RUSSIA  

 

The earthquake in the South Sandwich Islands was not reported felt in this remote area. It is the first of M>=5.2 within about 150 km of the epicenter since an M 5.3 on September 9, 2015. Forecast 119420 had expected activity in the South Sandwich Islands around August 27. Antipodal events commonly occur in the area of Kamchatka and the South Sandwich Islands in association with strong solar flare/geomagnetic storms. This earthquake, as well as an M 4.6 in Bosnia are located at 103-104 degrees from the M 7.0 events in Lombok, Indonesia and may have been promoted by concentrated energy from that source.

 

O: 29AUG2018 16:56:18  60.4S   24.1W mb=5.2  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 27AUG2018 119420    58.0S   26.0W 4.0-6.4 ACAAA  So. Sandwich Islands       

 

The strongest seismicity in the U.S. or Canada also continued at high latitudes today. This was an M 4.7 followed by a series of aftershocks in the central Andreanof Islands, Aleutians, Alaska. These were not reported felt in the epicentral areas which area remote. These events may have been promoted by the high tidal stresses associated with the full moon as described in this summary:

 

"The full moon arrived at 11:56 UT on August 26. Areas which were sub-solar at this time center near the Greenwich Meridian (0W) while those sub-lunar longitudes are near the International Date Line (IDL) at 180W longitude. Regions included in this area include the Aleutians of Alaska ..." (August 24-30, 2018)

 

The last event within about 100 km of these epicenter with M>=4.7 was an M 4.9  on May 24, 2018 and prior to that an M 5.1 on February 16, 2018. Forecast 119314 had expected this event within about 25 km was likely at the end of August.

 

 

O: 29AUG2018 17:27:57  51.0N  176.1W mb=4.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 29AUG2018 17:15:36  51.1N  176.1W ML=3.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 29AUG2018 15:06:46  51.1N  176.1W mb=4.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 29AUG2018 16:58:57  51.0N  176.1W mb=3.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 25AUG2018 119314    50.8N  175.8W 3.5-5.7 BAAAA  Andreanoff Isls, Aleutians 

 

Two areas of the Rocky Mountains were also active today. In Colorado an M 3.2 and 2.7 occurred near Rangley in northern Colorado and events of M 2.3 and 2.4 hit Yellowstone National Park, Wyoming. The last earthquake within about 100 km of the Colorado epicenter with M>=3.2 occurred on May 3, 2017 with M 3.3. No such earthquakes have hit the area in  75 km of this epicenter in at least the past 30 years.  Forecast 119269 had expected this activity north of this epicenter in Colorado around August 26.

 

O: 29AUG2018 16:01:02  40.8N  108.7W ML=2.7  EMSC   COLORADO                     

O: 29AUG2018 14:16:15  40.8N  108.7W ML=3.2  EMSC   COLORADO                     

P: 26AUG2018 119269    41.9N  108.7W 2.0-4.3 BBAAA  Colorado area              

 

While Yellowstone is often active at event levels of M 2.0-2.5, the region has been experiencing a lull in seismicity in recent months. The last earthquake in the area of M>=2.4 was an M 2.8 on August 26, 2018. Three other such events were recorded in Yellowstone from late May through August, 2018. Forecast 119311 had expected this activity was likely around August 31 within about 25 km of this epicenter. As the activity began within minutes of local solar noon it may have been promoted by tidal stresses, as is common in this type of geologic regime.

 

O: 29AUG2018 18:07:29  44.8N  110.8W ML=2.3  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 29AUG2018 19:44:34  44.8N  110.8W ML=2.4  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P: 31AUG2018 119311    44.6N  110.8W 2.0-4.3 AAAAA  Yellowstone/Wyoming        

 

STRONG QUAKES IN LOYALTY IS, MARIANA IS; QUAKE SHAKES LOS ANGELES, CA

 

EARTHQUAKE SUMMARY FOR AUGUST 28, 2018

 

Global seismicity was high today with an M 7.1 in the area southeast of the Loyalty Islands and an M 6.4 in the central Mariana Islands. These events are located within about 10-15 degrees from the geomagnetic equator and were probably enhanced by geomagnetic effects from the current geomagnetic storm, the strongest in nearly a year. A moderate M 4.4 earthquake was widely felt in the Los Angeles, California area today. NEIC reported intensity V in Pomona and IV in La Verne, San Dimas, Claremont, Glendora, Pomona, Covina, Montclair, Upland, Azusa, Chino, West Covina, Ontario, Rancho Cucamonga, El Monte, Yorba Linda, Corona, Los Angeles, Montrose and in general within about 50 km of the epicenter. Intensity II-III was reported within about 150 km of the epicenter in San Diego, California among others. A light aftershock of M 3.4 was felt in the same area with lesser shaking reported. Maximum intensity with this aftershock was VI in La Verne, California. No major damage or casualties were reported with this activity.

 

This summary has argued that a strong earthquake is possible in the area of Los Angeles this year as part of the 22-23 year cycle of such events in the region including strong quake in 1971 and 1994 in the San Fernando and Northridge regions. With the strong activity in Iran two days ago, a moderate seismic watch for California had been called in this report as:

 

"These earthquakes (in Iran) are located around 103-106 degrees from Central California north to the area off the coast of Oregon. An M 6.2 off the coast of Oregon on August 22 is located at 102-103 degrees from these epicenters in Iran and probably helped promote this activity at this time. Small aftershock off Oregon today may have been enhanced by energy from the Iranian quakes as well. This effects has been previous named "seismic ping pong" in this summary and occurs when one large quake helps trigger another and that in turn helps trigger secondary shocks in the first zone etc. The area from central California to west of Oregon is being placed under a precautionary seismic watch for the next four days  through the end of August. A moderate quake is considered possible in the area in this time period." (August 26, 2018)

 

The last earthquake within about 50 km of center of Los Angeles with M>=4.4 occurred nearly three years ago about 40 km east of today's epicenter on  December 30, 2015 with M 4.4. The last of significantly larger magnitude in  this area was an M 6.1 on March 29, 2014. The largest earthquake in the area in the past 10 years was an M 5.4-5.5 on July 29, 2008. Forecast 119237 had expected today's event within about 10 km of the epicenter was likely around August 27 as a moderate sized event.

 

O: 29AUG2018 03:02:57  34.1N  117.8W ML=2.2  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 29AUG2018 02:36:55  34.1N  117.8W ML=2.4  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 29AUG2018 02:33:28  34.1N  117.8W Mw=4.4  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 28AUG2018 20:49:33  34.2N  117.6W ML=2.0  EMSC   GREATER LOS ANGELES AREA, CALI

P: 27AUG2018 119237    34.2N  117.8W 2.5-5.6 AAAAA  So. California             

 

The strongest earthquake of the day was an M 7.1 in the area southeast of the Loyalty Islands. NEIC reported it was felt with intensity II in Dumbea, New Caledonia. This event occurred near local solar noon and was probably  promoted by geomagnetic effects and high tidal stresses, both of which maximize near this hour. Aftershocks included events of M 5.3, 5.2, 5.0, 4.8 and 4.8. Strong earthquakes in the Loyalty Island often come in groups and further moderately  strong to strong quakes may follow in the next days. When an M 5.4 foreshock hit the area on August 26, 2018 this summary noted:

 

"The strongest earthquakes in the world today was an M 5.4 in Kamchatka and an M 5.4 in the New Caledonia/Loyalty Islands south of Vanuatu. It was followed by moderate regional aftershocks including an 4.6. The last earthquake in the Loyalty Islands with M>=5.4 within about 200 km of this epicenter occurred on March 14, 2017 with M 5.6. Most recent activity in the area has occurred about 200 km to the west of today's epicenter. Forecast 119385 had expected this event was likely within about 50 km around August 27." (August 27-28, 2018)

 

The last earthquake of M>=7.1 in this area occurred more than 10 years ago as an M 7.3 on April 9, 2008 and prior to that an M 7.1 on March 25, 2007. The strongest quake in the area in the past 30 years was an M 7.7 on May 16, 1995. Forecast 119385 had expected today's earthquake as strong events at the end of August within about 100 km of today's activity.

 

O: 28AUG2018 20:25:27  22.0S  170.3E mb=4.8  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 29AUG2018 04:03:13  22.1S  170.2E mb=5.3  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 29AUG2018 04:27:13  22.2S  169.9E mb=5.0  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 29AUG2018 05:22:09  22.2S  170.0E mb=4.8  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 29AUG2018 04:48:35  22.2S  170.3E mb=5.2  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 29AUG2018 03:51:56  22.0S  170.2E Mw=7.1  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 27AUG2018 119385    22.0S  171.0E 4.0-6.0 AAAAA  Loyalty Islands            

P: 31AUG2018 119385    21.0S  169.0E 4.0-6.2 AAAAA  Loyalty Islands            

 

A strong earthquake of M 6.4 also occurred in the in the central to northern Mariana Islands. NEIC reported it was felt with maximum intensity VI in Saipan and VI in the Mariana Islands and Guam. Intensity IV was reported at Tinian, Garapan, with II-III in Guam at Santa Rita, Piti, Hagatna, Barrigada, Mangilao, Tamuning, Yigo and in San Jose, Saipan, Northern Mariana Islands.

This event was likely promoted by stresses from Tropical Storm Jebi as described

in the previous summary:

 

"TS Jebi (TD 25W) continued today east of Guam with winds up to 45 kts. It is expected to track to the northwest reaching the Mariana and Volcano Islands around August 30-31. Seismicity is expected to be enhanced in these regions as Typhoon Jebi passes through the region." (August 26-28. 2018)

 

The last earthquake of M>=6.4 in central and northern Mariana Islands occurred February 5, 2005 with M 6.5. Similar quakes occurred on April 5, 2990 (M 7.6); June 6, 1993 (M 6.5) and June 9, 1996 (M 6.5). Forecast 119159 had expected today's event was likely and possibly large within about 25 km of today' epicenter. This earthquake is located at 144 degrees from the M 7.1 in Brazil of August 24 and was probably enhanced by concentrated seismic energy from that source.

 

O: 28AUG2018 22:35:11  16.8N  146.8E Mw=6.4  EMSC   ANATAHAN REG, N. MARIANA ISLAN

P: 29AUG2018 119159    17.0N  147.0E 4.0-6.1 AAAAA  No. Marianas               

 

Strong earthquakes also occurred in Fiji with an M 5.7 felt in Suva, Central Fiji with intensity III. These were expected to have been promoted by the tidal stresses associated with the full moon as noted in previous issues of this summary:

 

"The full moon arrived at 11:56 UT on August 26. Areas which were sub-solar at this time center near the Greenwich Meridian (0W) while those sub-lunar longitudes are near the International Date Line (IDL) at 180W longitude. Regions included in this area include the Aleutians of Alaska and the Tonga-Fiji-New Zealand arc while those near 0 West include western Europe and portions of the mid-Atlantic Ridge." (August 24-28, 2018)

 

These moderately strong earthquakes of M 5.7 each also occurred north of the Loyalty Islands These events occurred near local solar midnight and noon at 15 degrees south of the geomagnetic equator and were probably promoted tidal and geomagnetic stresses. Forecasts 119364 and 119376 had expected this activity within about 100 km of these epicenters.

 

O: 29AUG2018 01:24:55  16.3S  178.1E mb=5.7  EMSC   FIJI                          

P: 23AUG2018 119364    16.0S  178.0E 4.0-6.1 CAAAA  Fiji Islands               

 

O: 28AUG2018 13:09:11  18.1S  177.9W Mw=5.7  EMSC   FIJI REGION                  

P: 30AUG2018 119376    19.0S  178.0W 4.0-6.0 AAAAA  Tonga Islands               

 

An M 6.2 also occurred today in the Timor region of Indonesia. This had been reported in the previous summary as:

 

 

"The strongest earthquake in the world today was an M 6.2 followed by an M 5.9 in the Timor region of Indonesia. BMG  reported it was felt with intensity II-III in Kupang and Rotendao, Kabupaten and in Timortengahselatan, Indonesia.

An aftershock of MS=5.8 was reported by  BMG to have been felt with similar intensity II-III in Kupang and Rotendao, Kabupaten and in Timortengahselatan, Indonesia. This epicenter is 15 degrees south of the local geomagnetic equator and was probably promoted by the current geomagnetic storm, the strongest in nearly a year. No major damage or casualties were reported with these earthquakes. The last earthquake in Timor with M>=6.2 was an M 6.3 on November 4, 2015 and prior to that an M 7.5 on November 11, 2004. Both of these events occurred about 250 km north of today's epicenters. No earthquakes of M>=6.2 have occurred within 150 km of today's epicenter in at least 30 years. Forecast 119365 had expected today's earthquake was likely within about 100 km of this epicenter around August 26." (August 27-28, 2018)

 

O: 28AUG2018 07:13:31  10.6S  124.2E mb=5.6  EMSC   TIMOR REGION, INDONESIA      

O: 28AUG2018 11:55:48  10.8S  124.2E Mw=5.0  EMSC   TIMOR REGION, INDONESIA      

O: 28AUG2018 07:08:10  10.8S  124.2E Mw=6.2  EMSC   TIMOR REGION, INDONESIA      

P: 26AUG2018 119365    10.0S  124.0E 4.0-6.0 AAAAA  Flores Island area         

 

An earthquake of M 5.5 also shook regions of Java, Indonesia today. NEIC reported intensity IV in Yogyakarta at Sewon and II-III in Kashhan, Gamping, Yogyakarta, Depok, Mlati, Sleman, Ngaglik and in Java at Ngawen, Klaten and Wengon, Indonesia. This epicenter is about 1000 km west of the Timor event of M 6.2 yesterday and 700 km from the Lombok Indonesia area. Today's Java quake was located about 10-15 degrees south of the local geomagnetic equator and was probably promoted by the current geomagnetic storm, the strongest in nearly a year as described in the previous summaries:

 

 

"The geomagnetic field saw stormy conditions today. The AP level was 26. High latitude geomagnetic field also saw stormy conditions  with AP at 56. Planetary KP levels reached 7 early on August 26 and 27 and high latitude KP reached 8 around 0900 UT. This is the strongest geomagnetic storm in nearly a year - since KP reached 96 on September 8, 2017 with high latitude KP at 110. That storm accompanied several X-class flares and was coincident with the great M 7.9 earthquake in Chiapas and Oaxaca, Mexico of the same date. Substantial enhancement of global seismicity is expected through the end of August due to effects of this storm on seismicity. The largest quakes are likely near the IDL and GM about 10-15 degrees from the geomagnetic equator and at high latitudes towards the end of this period." (August 27-28, 2018)

 

The earthquake in Java of M 5.5 is the strongest within about 100 km of this epicenter since a similar M 5.5 a year ago on August 27, 2017. Forecasts 119373 and 119130 was expected in Java at the end of August.

 

O: 28AUG2018 18:36:35   8.8S  110.3E mb=5.5  EMSC   JAVA, INDONESIA              

P: 28AUG2018 119373    10.0S  109.0E 4.0-6.0 ABAAA  So. of Java                

P: 29AUG2018 119130     9.0S  108.0E 4.0-6.2 AABAA  So. of Java                

 

The strongest earthquake in the U.S. or Canada today was an M 4.3-4.6 near Manley Hot Springs, central Alaska. NEIC reported intensity V in Manley Hot Springs and IV in Yukon Flats National Wildlife area with lesser shaking of II-III in Fairbanks, and possibly Eagle River and Kenai, Alaska. This is the strongest earthquake within about 100 km of this epicenter since an M 4.7 on December 8, 2016 and prior to that an M 4.8 on October 23, 2014. Forecast 119334 expected this event to the south around August 28.

 

O: 28AUG2018 15:18:43  65.2N  150.5W Mw=4.3  EMSC   NORTHERN ALASKA              

O: 28AUG2018 15:18:43  65.2N  150.5W Mw=4.6  ANSS   NORTHERN ALASKA              

P: 28AUG2018 119344    62.9N  150.2W 3.2-6.1 ACAAA  Central Alaska             

 

STRONG QUAKES IN TIMOR, INDONESIA; SOUTH SHETLAND ISLANDS

 

EARTHQUAKE SUMMARY FOR AUGUST 27, 2018

 

The strongest earthquake in the world today was an M 6.2 followed by an M 5.9 in the Timor region of Indonesia. BMG  reported it was felt with intensity II-III in Kupang and Rotendao, Kabupaten and in Timortengahselatan, Indonesia.

An aftershock of MS=5.8 was reported by  BMG to have been felt with similar intensity II-III in Kupang and Rotendao, Kabupaten and in Timortengahselatan, Indonesia. This epicenter is 15 degrees south of the local geomagnetic equator and was probably promoted by the current geomagnetic storm, the strongest in nearly a year. No major damage or casualties were reported with these earthquakes. The last earthquake in Timor with M>=6.2 was an M 6.3 on November 4, 2015 and prior to that an M 7.5 on November 11, 2004. Both of these events occurred about 250 km north of today's epicenters. No earthquakes of M>=6.2 have occurred within 150 km of today's epicenter in at least 30 years.  Forecast 119365 had expected today's earthquake was likely within about 100 km of this epicenter around August 26. These also appear to be related to the recent activity to the west in Lombok, Indonesia. Both are near the antipode of the M 7.3 in Venezuela of August 21 and may have been promoted from that source.

 

O: 28AUG2018 07:13:31  10.6S  124.2E mb=5.6  EMSC   TIMOR REGION, INDONESIA      

O: 28AUG2018 07:08:10  10.9S  124.2E MS=6.2  BMG  Felt with intensity II-III

O: 28AUG2018 07:13:29  10.9S  124.2E MS=5.8  BMG  Felt with intensity II-III

O: 28AUG2018 07:08:10  10.8S  124.2E Mw=6.2  EMSC   TIMOR REGION, INDONESIA      

P: 26AUG2018 119365    10.0S  124.0E 4.0-6.0 AAAAA  Flores Island area         

 

A moderately strong M 5.6 earthquake was also recorded in the South Shetland Islands west of the South Sandwich Islands and north of Antarctica.  It was not reported felt in this remote area. It was probably promoted by geomagnetic, the strongest geomagnetic storm in nearly a year, and tidal effects - full moon alignment -  as previous outlined in this summary:

 

 

"The geomagnetic field saw stormy conditions today. The AP level was 26. High latitude geomagnetic field also saw stormy conditions  with AP at 56. Planetary KP levels reached 7 early on August 26 and 27 and high latitude KP reached 8 around 0900 UT. This is the strongest geomagnetic storm in nearly a year - since KP reached 96 on September 8, 2017 with high latitude KP at 110. That storm accompanied several X-class flares and was coincident with the great M 7.9 earthquake in Chiapas and Oaxaca, Mexico of the same date. Substantial enhancement of global seismicity is expected through the end of August due to effects of this storm on seismicity. The largest quakes are likely near the IDL and GM about 10-15 degrees from the geomagnetic equator and at high latitudes towards the end of this period." (August 27-28, 2018)

 

This is the strongest earthquake in the South Shetland Islands within about

300 km of this epicenter since an M 5.7 on July 16, 2013. A strong quake of M 6.6 hit the area on January 15, 2012.  Forecast 119421 had expected activity in this area to the east was likely with possibly large magnitude around August 23. This epicenter is located at the fifth node (72 degrees) from the M 7.3 in Venezuela of August 21; at the seventh node (51 degrees) from the Brazil quake of August 24 and 109 from Lombok, Indonesia and may have been promoted from those sources.

 

O: 27AUG2018 20:09:23  61.8S   58.4W Mw=5.6  EMSC   SOUTH SHETLAND ISLANDS       

O: 27AUG2018 20:09:22  61.8S   58.1W mw=5.6  ANSS   South Shetland Islands"      

P: 23AUG2018 119421    60.0S   44.0W 3.0-6.1 BBCAA  So. So. America            

 

An earthquake of M 5.5 was widely felt in the region of central Chile today. CSN reported this earthquake was felt with intensity  V in  Atacama at Vallenar; IB Alto del Carmen, Freirina; III in Copiapo, Huasco, Tierra Amarilla; V in Coquimbo at Andacollo, Combarbala, Illapel, Monte Patria, Ovalle, Salamanc and Vicuna; VI in Paiguano, Punitaqui, Rio Hurtado, La Serena, La Higuera, IV in Coquimbo and Canela; in Valparaiso III in Quillota and Zapallar. No damage or casualties were reported. NEIC reported this earthquake of M 5.2-5.5 in Coquimbo, Chile was felt with intensity V in La Serena, Coquimbo; IV in Monte Patria and Coquimbo and II-III in the area(s) of Copiapo, Atacama and Villa Alemana, Valparaiso, Chile. An earlier M 4.9 was felt in La Serena with IV and III in Coquimbo, Chile. No major damage was reported but some minor damage occurred. The last earthquake within about 150 km of this epicenter with M>=5.5 occurred as an M 6.2 on April 10, 2108 and prior to that an M 5.8 more than a year ago on August 12, 2017.  Forecast 119383 had expected this event was likely within about 100 km of this epicenter around August 24.

 

O: 28AUG2018 04:51     29.7S   71.3W mb=5.5  GUC    Atacama at Vallenar; IV Alto d

P: 24AUG2018 119383    29.0S   71.0W 4.0-6.0 BAAAA  Coast Central Chile        

 

STRONG GEOMAGNETIC STORM LIKELY SEISMIC ENHANCER

 

EARTHQUAKE SUMMARY FOR AUGUST 26, 2018

 

The strongest geomagnetic storm in nearly a year occurred today. The geomagnetic field saw stormy conditions today. The AP level was 76. High latitude geomagnetic field also saw stormy conditions  with AP at 90. Planetary KP levels reached 7 early on August 26 and high latitude KP reached 8 around 0900 UT. This is the strongest geomagnetic storm in nearly a year - since KP reached 96 on September 8, 2017 with high latitude KP at 110. That storm accompanied several X-class flares and was coincident with the great M 7.9 earthquake in Chiapas and Oaxaca, Mexico of the same date. Substantial enhancement of global seismicity is expected through the end of August due to effects of this storm on seismicity. The largest quakes are likely near the IDL and GM about 10-15 degrees from the geomagnetic equator and at high latitudes towards the end of this period.

 

 

The strongest earthquakes in the world today were an M 5.4 in Kamchatka and an M 5.4 in the New Caledonia/Loyalty Islands south of Vanuatu. The Loyalty Isalands quake was followed by moderate regional aftershocks including an 4.6. The last earthquake in the Loyalty Islands with M>=5.4 within about 200 km of this epicenter occurred on March 14, 2017 with M 5.6. Most recent activity in the area has occurred about 200 km to the west of today's epicenter. Forecast 119385 had expected this event was likely within about 50 km around August 27.

 

O: 26AUG2018 16:09:08  22.1S  170.5E mb=5.2  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

O: 26AUG2018 16:09:13  22.2S  170.2E mw=5.4  ANSS   Ile Hunter New Caledonia

O: 26AUG2018 21:37:07  22.4S  170.0E mb=4.6  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 27AUG2018 119385    22.0S  171.0E 4.0-6.0 AAAAA  Loyalty Islands            

 

The earthquake in Kamchatka was well to the north of normal activity in the region. It was not reported felt in this remote volcanic area. The last event within about 200 km of this epicenter in Kamchatka with M>=5.4 occurred on July 7, 1996 with M 6.4, the only such event in this area in at least 30 years. The earthquake occurred near local solar noon and may have been enhanced from tidal and geomagnetic effects. The geomagnetic storm reached KP 8 near the time of this earthquake which was at a high northern latitude.  Forecast 119323 expected activity in the area in late August. The epicenter in Kamchatka is at 103 degrees from the M 7.3 in Venezuela of August 21 and was probably promoted by concentrated energy from that source.

 

O: 27AUG2018 03:19:00  58.7N  158.8E mb=5.4  EMSC   KAMCHATKA PENINSULA, RUSSIA  

P: 24AUG2018 119323    56.0N  165.0E 4.0-6.6 BCCAA  Komandorsky Isl            

 

Two people were killed in the earthquakes in western Iran including an M 6.1. At least 360 were reported injured in this activity. The strongest events in the area today were M 4.0 and 4.1. Forecast 119247 had expected this activity around August 23.

 

O: 26AUG2018 08:25:04  34.5N   46.4E mb=4.1  EMSC   WESTERN IRAN

O: 26AUG2018 12:33:29  34.6N   46.2E ML=3.7  EMSC   WESTERN IRAN

O: 27AUG2018 01:52:57  34.6N   46.3E ML=3.5  EMSC   WESTERN IRAN

O: 26AUG2018 15:51:42  34.6N   46.3E ML=3.7  EMSC   WESTERN IRAN

O: 26AUG2018 17:38:42  34.6N   46.3E ML=3.8  EMSC   WESTERN IRAN

O: 26AUG2018 18:44:46  34.6N   46.3E ML=3.9  EMSC   WESTERN IRAN

O: 26AUG2018 17:58:05  34.7N   46.3E ML=3.6  EMSC   WESTERN IRAN

O: 26AUG2018 09:23:33  34.5N   46.2E ML=4.0  EMSC   WESTERN IRAN                 

P: 23AUG2018 119247    33.0N   46.0E 3.8-6.4 BBAAA  So. Iran                   

 

The strongest earthquake in the U.S. or Canada today was an M 3.4 off the coast of Northern California. NEIC reported it was felt with intensity II in Ferndale and Garberville, California. This event is located at 104 degrees from the M 6.1 event in Iran yesterday, a distance at which concentrated seismic energy can help promote additional  follow-up seismicity. This had been emphasized in the previous issue of this summary as:

 

 

"These earthquakes are located around 103-106 degrees from Central California north to the area off the coast of Oregon. An M 6.2 off the coast of Oregon on August 22 is located at 102-103 degrees from these epicenters in Iran and probably helped promote this activity at this time. Small aftershock off Oregon today may have been enhanced by energy from the Iranian quakes as well. This effects has been previous named "seismic ping pong" in this summary and occurs when one large quake helps trigger another and that in turn helps trigger secondary shocks in the first zone etc. The area from central California to west of Oregon is being placed under a precautionary seismic watch for the next four days through the end of August. A moderate quake is considered possible in the area in this time period." (August 26, 2018)

 

The last earthquake within about 50 km of this epicenter with M>=3.4 was an M 3.4 on August 17, 2018 and before that an M 3.4 on April 7, 2018. The last of larger magnitude was an M 4.7 on March 23, 2018.  Forecast 119292 expected this activity was likely around August 29.

 

O: 26AUG2018 17:57:49  40.3N  124.6W ML=3.4  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 29AUG2018 119292    40.6N  124.9W 2.5-4.8 BAAAA  Off Coast of No. Calif     

 

STRONG IRANIAN QUAKE MAY PROMOTE ADDITIONAL ACTIVITY

 

EARTHQUAKE SUMMARY FOR AUGUST 25, 2018

 

Strong earthquakes of M 6.0-6.1 hit the Fox Islands, Aleutians, Alaska and  western Iran today. NEIC reported the mainshock in Iran was felt with intensity VI in Kermanshah at Javanrud, Halubah, Eilam, and V in Gonbad-e Kavus, Mehabad, Bakhtaran, IV in Aslamabad, Sannandaj, Kirkuk, Irbil, Naghada, Ardakan, with lesser shaking of II-III in Tebriz, Orumiyeh, Araq, Sanjan, Al-Hillah, al-Fallujah, as-Suwayrah, . NEIC reported the mainshock was felt with intensity VI in Kermanshah at Javanrud, Halubah, Eilam, and V in Gonbad-e Kavus, Mehabad, Bakhtaran, IV in Aslamabad, Sannandaj, Kirkuk, Irbil, Naghada, Ardakan, with lesser shaking of II-III in Tebriz, Orumiyeh, Araq, Sanjan, Al-Hillah, al-Fallujah, as-Suwayrah, Ecbatana, Pawa, and Pol-e-Zahab Iran and in Iraq at Baghdad, Ecbatana. An aftershock of M 4.4 was reported felt with intensity IV in Orumiyeh, Iran. These earthquakes are located around 103-106 degrees from Central California north to the area off the coast of Oregon. An M 6.2 off the coast of Oregon on August 22 is located at 102-103 degrees from these epicenters in Iran and probably helped promote this activity at this time. Small aftershock off Oregon today may have been enhanced by energy from the Iranian quakes as well. This effects has been previous named "seismic ping pong" in this summary and occurs when one large quake helps trigger another and that in turn helps trigger secondary shocks in the first zone etc. The area from central California to west of Oregon is being placed under a precautionary seismic watch for the next four days  through the end of August. A moderate quake is considered possible in the area in this time period. The full moon today and the first solar flares of note in more than a month will also be considered promoters for this activity.

 

The last earthquake of M>=6.1 within about 200 km of these events in Western

Iran occurred November 12, 2017 with M 7.3, the only such event in the area in  the past 30 years. Today's events were reported to have damaged hundreds of buildings in the area.  Forecast 119247 had expected these events to the south in this area were likely around August 23. The M 6.1 occurred within about two hours of local solar midnight and may have been affected by tidal stresses from the full moon which maximize near this hour.

 

These epicenters are also located at 100 degrees from the M 7.3 in Venezuela of August 21. Because that was an intermediate focus quake, the distance at which the concentration of energy returns to the surface is slightly less than an earthquake with a shallow focus - and it should return and help trigger quakes near 100 degrees away, so this is consistent with triggering from Venezuela.

 

O: 25AUG2018 22:47:46  34.6N   46.2E ML=4.0  EMSC   WESTERN IRAN

O: 25AUG2018 22:13:25  34.6N   46.3E Mw=6.1  EMSC   WESTERN IRAN

O: 26AUG2018 05:18:29  34.6N   46.3E mb=4.3  EMSC   WESTERN IRAN

O: 26AUG2018 00:53:59  34.7N   46.7E mb=4.2  EMSC   WESTERN IRAN

O: 25AUG2018 23:25:07  34.5N   46.3E mb=4.4  EMSC   WESTERN IRAN                 

P: 23AUG2018 119247    33.0N   46.0E 3.8-6.4 ABAAA  So. Iran                   

 

O: 25AUG2018 15:27:00  43.0N  126.5W ML=3.0  EMSC   OFF COAST OF OREGON          

P: 26AUG2018 119293    42.5N  126.8W 3.0-5.0 AAAAA  Off Coast of Oregon        

 

O: 26AUG2018 06:57:15  43.5N  128.1W ML=3.1  EMSC   OFF COAST OF OREGON          

P: 23AUG2018 119295    43.9N  128.4W 3.0-5.6 BAAAA  Off Coast of Oregon        

 

NEIC reported this earthquake of M 3.1 off Oregon was felt with intensity II-III in the area(s) of Brookings, Oregon.

 

The strongest earthquake in the U.S. or Canada today was the M 6.0 in the Fox Islands, Aleutians, Alaska. NEIC reported it was felt with intensity II in Akutan, Alaska about 400 km to the east of the epicenter. The last earthquake of M>=6.0 within about 200 km of this epicenter occurred on July 27, 2015 with M 6.9.  Forecast 119322 had expected today's event in this region was likely around August 24. Like the other two strong earthquakes in the Aleutians in the western Aleutians, this epicenter is at the fifth node (72 degrees) from the M 8.2 in the Fiji Islands of August 19 and was probably promoted from that source. Promotion from the full moon today was also high at this longitude as noted in previous  summaries:

 

"The full moon will arrive at 11:56 UT on August 26. Areas which are sub-solar at this time center near the Greenwich Meridian (0W) while those sub-lunar longitudes are near the International Date Line (IDL) at 180W longitude. Regions included in this area include the Aleutians of Alaska and the Tonga-Fiji-New Zealand arc while those near 0 West include western Europe and portions of the mid-Atlantic Ridge." (August 24-26, 2018)

 

The epicenter of the M 6.0 in the Fox Islands was probably promoted from the

M 7.1 in Brazil of August 24 as it is located at 103-104 degrees from that epicenter. Seismic energy returns to the surface in concentrated form at this distance from large quakes after reflecting and refracting off core boundaries and is often seen to affect zonal seismicity in this distance zone. Aftershocks also continued in the Fiji Islands at 102-103 degrees from Brazil today.

 

O: 25AUG2018 17:25:31  52.0N  170.9W ML=3.9  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 25AUG2018 16:50:03  52.2N  171.1W Mw=5.9  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 25AUG2018 16:50:04  52.3N  171.2W mw=6.0  ANSS   Amukta Island Alaska

P: 24AUG2018 119322    52.4N  169.4W 3.5-5.3 AAAAA  Fox Islands, Aleutians     

 

A moderate aftershock in the region of Lombok, Indonesia also occurred today. NEIC reported it was felt with intensity V in Praya and II-III in Sumbawa, Mataram, Karangasem, Klungkung, Ubud, Denpasar, Kuta and Genteng, Java and Bali, Indonesia. These area aftershocks of strong events in the area  including an M 6.9 on August 19 and an M 6.9 on August 5. These followed the first shock in the area in at least seven years of M>6.3 which occurred July 28, 2018 with M 6.4. Forecasts 119129 and 119134 had expected this strong Lombok activity around August 28-29.

 

O: 25AUG2018 18:33:20   8.4S  117.0E Mw=5.5  EMSC   LOMBOK REGION, INDONESIA     

O: 25AUG2018 18:33:20   8.4S  116.9E Mw=5.7  ANSS   LOMBOK REGION, INDONESIA     

O: 26AUG2018 03:54:06   8.4S  117.0E mb=4.9  EMSC   LOMBOK REGION, INDONESIA     

P: 28AUG2018 119129     8.0S  116.0E 4.0-6.2 AAAAA  Lombok, Indonesia          

P: 29AUG2018 119134     8.0S  117.0E 4.0-5.8 BAAAA  Sumbawa Island area        

 

A moderate M 5.4 in the Southern Kuril Islands was followed by aftershocks of M 4.7, 4.5 and 4.5. These were not reported felt in this area. The last earthquake within about 150 km of these epicenters with M>=5.4 occurred on June 2, 2018 with M 5.5.  Forecast 119272 had expected a possibly strong quake in the area towards the end of August. These epicenters are located at the sixth node (60 degrees) from the Lombok area and were probably promoted from that source.

 

O: 25AUG2018 18:25:36  44.2N  149.6E mb=4.7  EMSC   KURIL ISLANDS

O: 26AUG2018 05:57:12  44.2N  149.6E mb=5.4  EMSC   KURIL ISLANDS

O: 26AUG2018 05:49:38  44.2N  150.0E mb=4.5  EMSC   KURIL ISLANDS

O: 25AUG2018 18:56:50  44.3N  149.6E mb=4.5  EMSC   KURIL ISLANDS                

P: 29AUG2018 119272    44.0N  148.0E 3.5-6.2 BAAAA  Hokkaido, Japan            

 

MODERATE QUAKE SHAKES ANDAMAN ISLANDS, INDIA

 

EARTHQUAKE SUMMARY FOR AUGUST 24, 2018

 

An earthquake of M 5.5 occurred in the Andaman Islands, India today. NEIC reported it was felt with intensity IV in Port Blair, Andaman and Nicobar Islands, India. The last earthquake within about 300 km of this epicenter in the Andaman Islands of M>=5.5 occurred on February 13, 2018 with M 5.6 and M 5.9 on January 25, 2018. There was a lull in such activity between April 2012 and January 2018. Forecast 119137 had expected a possibly strong quake in the Andaman Islands was likely around August 27.

 

O: 24AUG2018 10:49:26  10.5N   91.7E mb=5.5  EMSC   ANDAMAN ISLANDS, INDIA REGION

O: 24AUG2018 12:18:07  10.7N   91.6E mb=4.5  EMSC   ANDAMAN ISLANDS, INDIA REGION

P: 27AUG2018 119137    13.0N   92.0E 4.0-6.2 BCAAA  Andaman Islands            

 

The strongest earthquake in the world today was the M 7.1 deep beneath Brazil.

In the previous issue of this summary it had been described as:

 

"A major deep focus earthquake of M 7.1 hit near the Peru-Brazil border today.

Because of the great depth, no damage was reported at the surface and light shaking was felt in areas far from the hypocenter such as Iquique and Arica Chile and Arequipa, Peru. The epicenter of this event is 103 degrees from the M 8.2 in Fiji of August 19. Seismic energy reflects and refracts off inner earth boundaries and is returned to the surface in concentrated form at this distance on the surface. Strong seismic enhancement at this distance near 103 degrees from major events often is seen. The last earthquake within about 250 km of this event on the Peru-Brazil border with M>=7.1 was an M 7.6 on November 24, 2015, the only such in at least 30 years.  Forecast 119361 had expected an event in Brazil to the west was likely around August 25." (August 24, 2018)

 

O: 24AUG2018 09:04:08  11.1S   70.9W Mw=7.1  EMSC   PERU-BRAZIL BORDER REGION    

P: 25AUG2018 119361    10.0S   75.0W 3.5-5.6 ABCAA  Brazil                     

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.3 near the Davis Strait, Canada. It was not reported felt in this remote area. NEIC has reported five earthquakes in the region within about 200 km of this epicenter with M>=4.3 since 1990. The last of these was an M 4.4 on September 30, 2006, the largest was an  M 4.9 on January 21, 1998. Forecast 119336 had expected today's event within about 100 km of the epicenter was likely around August 27.

 

O: 23AUG2018 23:14:30  60.4N   56.2W ML=4.3  NRCA  459 km NE from Nutak          

P: 27AUG2018 119336    61.0N   58.0W 2.5-4.3 BAAAA  Baffin/Davis Strait Canada 

 

The largest event in the U.S. or Canada today was an M 4.1 in central Colorado.

NEIC reported it was felt with intensity II-III in Colorado at De  Beque, Grand Junction, Meeker, Mack, Cedaredge, Eckert, Poinia, Hotchkiss, Olathe, Crawford, Montrose and Colorado Springs and in Utah at Moab. The last earthquake with M>=4.3 within about 100 km of this epicenter in Colorado was an M 4.3 on January 31, 2002 about 100 km northeast of today's epicenter. No other events in this area of M>=4.3 have been recognized since at least 1990. Forecast 119207 had expected this event about 50 km to the south would most likely occur around August 23.

 

NEIC reported the earthquake of M 2.8 in Central Colorado was felt with intensity II-III in the area(s) of Grand Junction, Glade Park and Cedaredge, Colorado.

 

 

O: 24AUG2018 11:21:42  39.7N  108.4W ML=2.8  EMSC   COLORADO                     

O: 24AUG2018 10:02:37  39.8N  108.4W Mw=4.1  EMSC   COLORADO                      

P: 23AUG2018 119207    39.2N  108.4W 2.0-4.6 AAAAA  Colorado area              

 

The event in central Colorado was preceded by two light earthquakes in the area of southern Colorado and northern New Mexico, an active area which often has light earthquake at times of full moons. The last in this area of M>=3.6 occurred  February 25, 2018 with M 3.7 and before that on December 30, 2017 (M 4.0) Forecast 119207 expected today's earthquake was likely around August 23 within about 25 km of this epicenter.

 

 

O: 24AUG2018 06:56:51  36.9N  104.9W Mw=3.6  EMSC   NEW MEXICO                   

O: 24AUG2018 07:59:18  37.0N  104.9W ML=3.2  EMSC   NEW MEXICO                   

P: 23AUG2018 119207    36.9N  105.1W 2.0-4.6 AAAAA  Colorado area               

 

 

MAJOR EARTHQUAKE HITS BENEATH BRAZIL-PERU AT 103 DEGREES FROM FIJI

 

EARTHQUAKE SUMMARY FOR AUGUST 23, 2018

 

A major deep focus earthquake of M 7.1 hit near the Peru-Brazil border today. Because of the great depth, no damage was reported at the surface and light shaking was felt in areas far from the hypocenter such as Iquique and Arica Chile and Arequipa, Peru. The epicenter of this event is 103 degrees from the M 8.2 in Fiji of August 19. Seismic energy reflects and refracts off inner earth boundaries and is returned to the surface in concentrated form at this distance on the surface. Strong seismic enhancement at this distance near 103 degrees from major events often is seen. The last earthquake within about 250 km of this event on the Peru-Brazil border with M>=7.1 was an M 7.6 on November 24, 2015, the only such in at least 30 years.  Forecast 119361 had expected an event in Brazil to the west was likely around August 25.

 

O: 24AUG2018 09:04:08  11.1S   70.9W Mw=7.1  EMSC   PERU-BRAZIL BORDER REGION    

P: 25AUG2018 119361    10.0S   75.0W 3.5-5.6 ABCAA  Brazil                     

 

The largest event in the U.S. or Canada today was an M 4.3 in central Colorado.

NEIC reported it was felt with intensity II-III in Colorado at De  Beque, Grand Junction, Meeker, Mack, Cedaredge, Eckert, Poinia, Hotchkiss, Olathe, Crawford, Montrose and Colorado Springs and in Utah at Moab. The last earthquake with M>=4.3 within about 100 km of this epicenter in Colorado was an M 4.3 on January 31, 2002 about 100 km northeast of today's epicenter. No other events in this area of M>=4.3 have been recognized since at least 1990. Forecast 119207 had expected this event about 50 km to the south would most likely occur around August 23.

 

O: 24AUG2018 10:02:37  39.8N  108.4W mb=4.3  EMSC   COLORADO                     

P: 23AUG2018 119207    39.2N  108.4W 2.0-4.6 AAAAA  Colorado area              

 

The event in central Colorado was preceded by two light earthquakes in the area of southern Colorado and northern New Mexico, an active area which often has light earthquake at times of full moons. The last in this area of M>=3.6 occurred  February 25, 2018 with M 3.7 and before that on December 30, 2017 (M 4.0). Forecast 119207 expected today's earthquake was likely around August 23 within about 25 km of this epicenter.

 

O: 24AUG2018 06:56:51  36.9N  104.9W Mw=3.6  EMSC   NEW MEXICO                   

P: 23AUG2018 119207    36.9N  105.1W 2.0-4.6 AAAAA  Colorado area              

 

The strongest earthquake in Alaska today was an M 4.2 in the Fox Islands, Aleutians. It was not reported felt in this remote area. Forecast 119322 had expected this event was likely around August 24. This epicenter is located at 103 degrees from the Brazil M 7.1 mainshock today.

 

O: 24AUG2018 03:11:35  53.0N  167.9W mb=4.2  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 24AUG2018 119322    52.4N  169.4W 3.5-5.3 AAAAA  Fox Islands, Aleutians     

 

 

 

 

STRONG SEISMIC GLOBAL ACTIVATION INCLUDES ALEUTIANS AND OFF OREGON COAST

 

EARTHQUAKE SUMMARY FOR AUGUST 22, 2018

 

A number of moderately strong to strong earthquake occurred around the world today in the global seismic activation which followed the cessation of moderate earthquakes in Hawaii. Today's strong events include two in the U.S. - an M 6.2 off the coast of Oregon and an M 6.3 in the western Aleutian Islands of Alaska. Other moderately strong earthquakes occurred in the Fiji Islands aftershock zone (M 5.5); the Balleny Islands (M 5.6); South of Africa (M 5.5); the Solomon Islands (M 5.8); Venezuela (M 5.8).

 

The largest earthquake of the day was an M 6.3 in the Andreanof Islands, Alaska. It was not reported felt and no tsunami was associated. This appears to be an aftershock of the M 6.6 which had its epicenter to the southwest of this on August 15. These are the strongest earthquakes in the western Aleutian Islands since August 30, 2013. They are located at the fifth node (72 degrees) from the great M 8.2 earthquake in Fiji of August 19 and today's event was likely promoted by energy from that source.  Forecast 119315 had expected today's event within about 100 km was likely around August 23.

 

O: 23AUG2018 03:35:16  51.5N  177.9W Mw=6.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 23AUG2018 119315    51.2N  179.9W 3.5-5.7 AAAAA  Andreanoff Isls, Aleutians 

 

An earthquake of M 5.5 at the same longitude hit Fiji about six minutes after the Andreanof Islands. It is an aftershock of the M 8.2 Fiji quake. Both these may have been enhanced by tidal stresses associated with the upcoming full moon as noted in this summary:

 

The full moon will arrive at 11:56 UT on August 26. Areas which are sub-solar at this time center near the Greenwich Meridian (0W) while those sub-lunar longitudes are near the International Date Line (IDL) at 180W longitude. Regions included in this area include the Aleutians of Alaska and the Tonga-Fiji-New Zealand arc while those near 0 West include western Europe and portions of the mid-Atlantic Ridge. These are the areas most likely to see tidally enhanced seismicity in the next week and include major aftershock zones in the western Andreanof Islands and Tonga-Fiji-Vanuatu. While these areas will experience the maximum stress, many other areas can also see tidal enhancement of seismicity at this time.

 

O: 22AUG2018 15:28:50  18.1S  177.9W mb=4.8  EMSC   FIJI REGION                  

O: 23AUG2018 03:41:16  18.2S  178.2W mb=5.5  EMSC   FIJI REGION                  

P: 26AUG2018 119375    18.0S  178.0W 4.0-5.8 AAAAA  Tonga Islands              

 

 

The M 6.2 off the coast of Oregon was reported felt along the entire coast of Oregon and possibly in Washington and northern California within about 500 km of the epicenter. Intensity II-III was reported by NEIC to have occurred in Woodland, Camas, La Center, Longview, Hoquiam, La Center, Vancouver, Tacoma, Sequim and Seattle, Washington; in Oregon at Bandon, Langlois, Coquille, Port Orford, Coos Bay, Florence, Yachats, Toledo, Lincoln City, Neskowin, Veneta, Grants Pass, Falls City, Corvallis, Cloverdale, Bay City, Rockaway Beach, Sheridan, Springfield, Tolovana Park, McMinnville, Salem, Seaside, Gaston, Newberg, Cornelius, McKinleyville, Beaverton, Hillsboro, North Plains, Arcata, Portland, Tualatin, Lake Oswego, West Linn, Oregon City,  Post, and Klamath Falls, Oregon.

An M 5.3 earthquake occurred about 100 km to the northwest of this on July 29, 2018 but the last earthquake within about 150 km of today's epicenter with M>=6.3 occurred more than 10 years ago on January 10, 2008 (M 6.3) and prior to that on January 16, 2003 (M 6.2). The only other such event in the region since 1990 was an M 6.2 on October 27, 1994. There was no associated tsunami with today's quake and none would have been expected. Forecasts 119294 and 119285 had expected this event was likely around August 23 within about 50 km of the epicenter.

 

O: 22AUG2018 11:10:11  43.3N  128.3W ML=3.5  EMSC   OFF COAST OF OREGON

O: 22AUG2018 19:31:39  43.6N  127.4W ML=3.1  EMSC   OFF COAST OF OREGON

O: 22AUG2018 11:24:41  43.6N  127.5W ML=3.2  EMSC   OFF COAST OF OREGON

O: 22AUG2018 09:31:48  43.6N  127.7W Mw=6.2  EMSC   OFF COAST OF OREGON

O: 23AUG2018 06:37:19  43.7N  127.7W ML=3.1  EMSC   OFF COAST OF OREGON          

P: 23AUG2018 119294    43.8N  126.5W 3.0-5.2 AAAAA  Off Coast of Oregon        

P: 23AUG2018 119295    43.9N  128.4W 3.0-5.6 AAAAA  Off Coast of Oregon        

 

An aftershock of M 5.8-5.9 occurred north of Venezuela today. This follows yesterday's M 7.3 in the region. NEIC reported it was felt with intensity V in Trinidad and Tobago at Chaguanas, and IV up to 500 km from the epicenter.

NEIC reported IV shaking in Trinidad and Tobago at Mucurapo, Couva, Marabella, Tunapuna, Tabaquite, and in Venezuela at Puerto la Cruz. Lesser shaking of II-III was felt in Guyana, Venezuela, Barbados, Saint Lucia, Saint Vincent and the Grenadines and Grenada.

 

Much of today's major seismicity occurred at high latitudes (Oregon, Aleutians, Balleny Islands, South of Africa) or at 10-15 degrees from the geomagnetic equator (Fiji, Bali, Solomon Islands) and was probably enhanced by the previous geomagnetic storm which ended today as noted in this and previous reports:

 

"The geomagnetic field saw quiet conditions today. The AP level was 6. High latitude geomagnetic field also saw quiet conditions  with AP at 5. The appears to conclude the strongest geomagnetic storm at high latitudes since June 26, 2018 when high latitude AP reached 33.  Global seismicity, especially within about 15 degrees of the geomagnetic equator and high latitudes is expected to be enhanced through August 23." (August 21-23. 2018)

 

Aftershocks in northern Alaska also continued today. The largest of these was an M 4.5 and was not reported felt. The aftershock zone may be expanding to the southwest with several event of M 3.4-3.5 about 400 km to the west in the north slope area. Forecast 119350 had expected this activity was likely around August 23.

 

O: 23AUG2018 04:30:40  69.5N  144.3W mb=4.5  EMSC   NORTHERN ALASKA

P: 23AUG2018 119350    69.3N  144.8W 3.0-5.0 AAAAA  Northern Alaska            

 

An unusual earthquake of M 3.5 occurred in Maui, Hawaii today and was followed by an M 2.8 aftershock about 100 km to the south in the Maui area. This is well to the northwest of the Kilauea eruption and is probably related to stresses from Hurricane Lane which is expected to pass south of Maui in the next two days. It is only the third hurricane to hit Hawaii in modern times and is the strongest. Tectonic seismicity such as today's events are likely in  the next several days. The last earthquake in this region of Hawaii with M>=3.5 occurred June 23, 2018 with M 3.9 and prior to that on May 18, 2018, an event of M 3.7. Today's event was on the surface, the first such since an M 4.1 on June 7, 2014. The only other such event in the past year was an M 4.0 on October 16, 2017. Forecasts 118907 and 119176 expected this activity within about 50 km between August 19 and 26.

 

O: 22AUG2018 11:05:28  19.8N  156.1W ML=2.8  EMSC   HAWAII REGION, HAWAII        

O: 22AUG2018 10:12:27  20.8N  156.3W ML=3.5  EMSC   MAUI REGION, HAWAII          

P: 19AUG2018 118907    20.3N  156.6W 4.0-5.7 BAAAA  Hawaii area                

P: 26AUG2018 119176    20.3N  156.6W 4.0-6.6 BAAAA  Hawaii area                

 

An unusual earthquake of M 3.7 also occurred in the region of northern Kansas

today. It was widely felt in the epicentral area.  NEIC reported this earthquake of M 3.7 in Northern Kansas was felt with intensity II-IV in the area(s) of Kansas at Natoma, Woodston, Plainville, Ellis, Hays, Hill City, Great Bend, Newton and possibly in Papillion, Nebraska.  This is the strongest earthquake in Kansas within about 150 km of this epicenter since an M 3.7 about 150 km northeast of today's epicenter on June 12, 2017. No earthquake of this magnitude or larger have hit the region since 1990.  Forecast 119255 had expected an event in Kansas was likely around August 25.

 

O: 22AUG2018 15:02:30  39.3N   99.0W Mw=3.7  EMSC   KANSAS                       

P: 25AUG2018 119255    38.0N   98.0W 2.0-4.3 BBAAA  Southern Plains            

 

An aftershock of M 5.8 occurred in the area where the M 7.3 was widely felt in northern Venezuela and Trinidad and Tobago yesterday. This area is at the antipode of the strong events in Lombok, Indonesia which have been occurring throughout late July and August, 2018. This summary noted the possibility of this antipodal activity in early August and discussed in  in more detail in the previous issue as:

 

"This epicenter is located within the antipodal range of the strong seismicity which has hit Lombok, Indonesia killing more than 400 people and damaging tens of thousands of buildings. The antipodal nature of Venezuela to Lombok had been noted in this summary including the possibility of seismic enhancement within

about 100 km of today's epicenter as:

 

"This epicenter is antipodal to 9N 64W an area north of Venezuela and south of Puerto Rico. Some sympathetic seismicity may occur in this area in the next several days." (August 6, 2018)" (August 21-22, 2018)

 

The last earthquake, aside from yesterday's M 7.3, of M>=5.8 in this region of Venezuela was an M 5.9 on December 6, 2016 and prior to that an M 6.1 on October 12, 2013. Ten such earthquakes have occurred in the area in the past 30 years.

 

Forecasts 118902 and 119113 had expected this activity between August 18 and 24.

 

O: 22AUG2018 13:27:49  10.7N   63.0W Mw=5.8  EMSC   SUCRE, VENEZUELA             

P: 18AUG2018 118902    11.0N   62.0W 3.4-5.0 BAAAA  Windward Islands           

P: 24AUG2018 119113    10.0N   63.0W 4.0-6.2 AAAAA  Venezuela                  

 

Two moderately strong earthquakes also occurred at high southern latitudes today. These occurred as an M 5.5 south of Africa and an M 5.6 in the Balleny Islands south of Australia. They were not reported felt in these remote areas. The event of M 5.5 South of Africa is near the antipode of the Alaska Peninsula and may help promote further seimicity in that region. The last event within about 300 km of this epicenter south of Africa with M>=5.5 was an M 5.6 on  April 27, 2016 and prior to that an M 5.5 on January 12, 2012. Forecast 119095 had expected this event was likely around August 18.

 

O: 22AUG2018 20:26:29  52.8S   27.9E mb=5.5  EMSC   SOUTH OF AFRICA              

P: 18AUG2018 119095    51.0S   29.0E 4.0-5.6 BBAAA  Atlantic-Indian Ridge      

 

The earthquake of M 5.6 in the Balleny Islands may be an aftershock of an M 5.8 within about 100 km of today's epicenter which occurred July 16. Today's epicenter is antipodal to southern Iceland and may help promote further seismicity in that region. An M 3.4 occurred in Iceland today.

 

O: 22AUG2018 22:49:10  61.3S  154.1E mb=5.6  EMSC   BALLENY ISLANDS REGION       

 

A moderate earthquake of M 5.3 also occurred in the Mexico City region today.

NEIC reported this earthquake of M 5.3 in Central Mexico was felt with intensity II-III in the area(s) of Guerrero at Tlapa and Acapulco; in Puebla; Mexico City Coatepec, Naucalpan, Tlanepantla, Mexico.  This is the strongest earthquake to hit within about 100 km of this epicenter in Guerrero, Mexico since M 5.5 on November 23, 2015. Forecasts 119162 and 119163 expected this activity was likely in late August.

 

O: 22AUG2018 18:03:11  17.1N   98.3W Mw=5.3  EMSC   GUERRERO, MEXICO             

O: 22AUG2018 14:54:38  16.2N   98.0W ML=4.0  EMSC   OAXACA, MEXICO

O: 22AUG2018 14:15:01  16.2N   98.1W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

P: 25AUG2018 119163    18.0N   97.0W 3.5-6.3 BAAAA  Oaxaca, Mexico             

P: 29AUG2018 119162    17.0N   98.0W 3.5-5.7 CAAAA  Oaxaca, Mexico             

 

Another antipodal pair is occurring the areas of Northern Colombia and Sumatra, Indonesia. An M 4.5 occurred in Northern Colombia today and was followed by a pair of events of M 5.2-5.5 and 4.2 southwest of Sumatra. These are about 200 km from true antipodal events but were probably promoted by seismic energy concentrated by geometric focusing. Forecast 118846 had expected the Colombia event around August 17 while the events in Sumatra were anticipated in forecast 118873. Further antipodal triggering is likely in these two areas which often see such activity.

 

NEIC reported the earthquake of M 4.5 in Colombia was felt with intensity II-III in the area(s) of Antioquia at Medellin and Sabaneta, Colombia.

 

O: 22AUG2018 13:06:25   6.2N   74.0W mb=4.5  EMSC   NORTHERN COLOMBIA            

P: 17AUG2018 118846     7.0N   73.0W 4.0-5.6 BAAAA  Colombia                   

 

BMG reported the M 4.2 was felt with intensity II-III in Liwa, Lampung, Indonesia. BMG reported the larger event at M 5.5 was felt with intensity III-IV in Liwa, II-III in Biha Lampung and Kota Agung and II in Krui, Lampung, Indonesia.

 

O: 23AUG2018 03:44:10   6.1S  103.7E mb=5.2  EMSC   SOUTHWEST OF SUMATRA, INDONESI

O: 23AUG2018 03:01:27  06.4S  103.8E MS=4.2  BMG  Felt with intensity II-III

O: 23AUG2018 03:44:04  06.5S  103.4E MS=5.5  BMG  Felt with intensity III-IV

O: 23AUG2018 03:01:27   6.4S  103.8E ML=4.2  EMSC   SOUTHWEST OF SUMATRA, INDONESI

P: 15AUG2018 118873     6.0S  104.0E 4.0-5.4 CAAAA  So. of Sumatera            

P: 24AUG2018 119130     6.0S  105.0E 4.0-6.0 AAAAA  So. of Java                

 

STRONG EARTHQUAKE IN VENEZUELA ANTIPODAL TO LOMBOK, INDONESIA

 

EARTHQUAKE SUMMARY FOR AUGUST 21, 2018

 

A strong earthquake of M 7.3 hit the region of northern Venezuela today. Due to its intermediate hypocenter it was widely felt but without major damage or associated tsunami. NEIC reported intensity VII (Minor damage) in Venezuela at Ciudad Guayana, Bolivar, Valle de la Pascua and Anaco, Venezuela. Intensity VI was felt as far as 800 km from the epicenter in Carora, Venezuela and in Cagua, Petare, Altagracia de Orituco, Ciudad Guayana, Bolivar, Puerto la Cruz, and in Trinidad and Tobago at Rio Claro, Tabaquite, Princes Town, Marabella, Tunapuna, San Fernando, Saint Joseph, Siparia, Couva, Chaguanas, Port of Spain, Mucurapo, Trinidad and Tobago. It also shook regions of Venezuela with intensity V in Porlamar, La Asuncion, Maturin, Cumana, and Cantaura among other communities. Light to moderate shaking also occurred in Grenada, Saint Vincent and the Grenadines, Saint Lucia, Barbados, Martinique, Netherlands Antilles, Guyana, Aruba, Brazil, Puerto Rico, Suriname, French Guiana, and Colombia. This is the strongest earthquake within about 300 km of this epicenter since an In the past 30 years the strongest such event was an M 7.0 on July 9, 1997, the only such event in this period of M>=6.7 (an M 6.7 occurred April 22, 1997). Only one other earthquake of M>=7.3 has occurred in this region in the past 100 years - an M 7.3 on March 19, 1953. Other similar quakes in historical times occurred on October 29, 1900 (M 7.7-8.4) in 1888 (M 7.5) and on October 21, 1766 (M 7.5).

 

This epicenter is located within the antipodal range of the strong seismicity which has hit Lombok, Indonesia killing more than 400 people and damaging tens of thousands of buildings. The antipodal nature of Venezuela to Lombok had been noted in this summary including the possibility of seismic enhancement within about 100 km of today's epicenter as:

 

"This epicenter is antipodal to 9N 64W an area north of Venezuela and south of Puerto Rico. Some sympathetic seismicity may occur in this area in the next several days." (August 6, 2018)

 

As today's event occurred at 10N 63W (compare with 9N 64W) this appears to be a confirmation of this hypothesis.

 

Because of the near-spherical geometry of the earth, seismic energy is focused at the point opposite to strong surface events such as earthquakes, volcanoes, cyclone, impacts, etc. This point is the antipode. Ground motions can be nearly as high as near the epicenter. This can often lead to enhancement of seismicity at the antipode, and if seismic, strong or moderate earthquakes can be triggered at the antipode of strong events as in this case which is a classic example of earthquakes at the antipode of strong quakes.

 

Forecast 118902 had expected this earthquake in Venezuela was likely around August 18.

 

O: 21AUG2018 21:31:43  10.8N   63.0W Mw=7.3  EMSC   OFFSHORE SUCRE, VENEZUELA    

P: 18AUG2018 118902    11.0N   62.0W 3.4-5.0 BAAAA  Windward Islands           

 

A strong earthquake of M 6.5-6.6 followed the Venezuelan quake about an hour later in Vanuatu. NEIC reported it was felt with intensity VI in Lakatoro, Malampa and in Luganville, Sanma, Vanuatu. Prominent promotion of this event probably occurred from geomagnetic effects related to the current geomagnetic storm - the largest in two months and from local effects from the Fiji quake of M 8.2 of August 19 which occurred about 1000 km to the east of this epicenter. The epicenter is located about 10-15 degrees south of the geomagnetic equator, a zone in which seismic triggering is expected at this time in previous summaries as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 14. High latitude geomagnetic field saw active conditions  with AP at 21. The continues the strongest geomagnetic storm at high latitudes since June 26, 2018 when high latitude AP reached 33. KP indices at high latitudes reached 7 at mid-day on August 18. This is the first instance of KP>6 in months. Global seismicity, especially within about 15 degrees of the geomagnetic equator and high latitudes is expected to be enhanced through August 22." (August 20-21, 2018)

 

The last earthquake in central Vanuatu with M>=6.5 within about 250 km of this epicenter occurred as an M 6.8 on May 9, 2017 and prior to that an M 7.0 on April 28, 2016.

 

Forecast 119067 expected this activity in southern Vanuatu was likely around August 19.

 

O: 21AUG2018 22:32:27  16.0S  168.2E Mw=6.5  EMSC   VANUATU                      

P: 19AUG2018 119067    19.0S  169.0E 4.0-5.6 ACAAA  Vanuatu Islands            

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.6-4.8 in the region of Vancouver Island, British Columbia, Canada. NEIC reported it was felt with intensity II in Port Hardy, British Columbia. Earthquakes Canada had no reports of damage or a tsunami and also reported light shaking in Port Hardy, B.C. The last earthquake in this region within about 150 km of this epicenter with M>=4.8 occurred more than a year ago on June 10, 2017. Forecast 119019 had expected this activity in mid-August.

 

O: 21AUG2018 13:10:08  50.9N  130.0W mb=4.6  EMSC   VANCOUVER ISLAND, CANADA REGIO

O: 21AUG2018 13:10:05  50.7N  130.5W ML=4.8  NRCA  215 km W   of Pt. Hardy

P: 16AUG2018 119019    50.3N  130.2W 3.0-5.1 BAAAA  British Colombia            

 

 

Hurricane Lane continued today east of Hawaii as a category 5 hurricane with winds up to 165 kts. It is expected to track to the west and may reach Hawaii around August 22-23 after making a turn to the north directly to Hawaii on August 23. It may make a direct hit on Honolulu on August 24-25. At current wind speeds this could cause considerable damage in the area. About two feet of rain is expected in this storm, the strongest to hit Hawaii in recorded history. The last similar hurricane did major damage in Hawaii and catastrophic damage can be

expected again. Unlike residents of the East Coast of the U.S. Hawaiians cannot easily evacuate to a non-threatened area, so most will have to ride this one out. This follows Hurricane Hector, a category 4 storm earlier in August which appears to have shut down the seismicity of M>=3 in Kilauea, Hawaii. The eruption of Kilauea may also be enhanced as the low pressures from Hurricane Lane may  pull magma to the surface and there are some indications this is already beginning.

 

A minor swarm of earthquake is occurring on the New Madrid Fault in western  Tennessee. A series of six quakes of M 1-2 occurred today in this region. None were reported felt. This area is often active but six events in a 14-hour  interval is unusual. The area is at 99-100 degrees from the M 8.2 in Fiji of August 19 and started shortly after that event. Seismic energy from Fiji was concentrated in this region due to reflections and refractions off the core-mantle boundary and probably helped promote this sequence. Forecast 118943 expected this activity in mid-August.

 

O: 21AUG2018 16:39:52  36.3N   89.5W md=1.5  ANSS   ENE of Ridgely Tennessee

O: 21AUG2018 13:14:21  36.3N   89.5W md=1.2  ANSS   ENE of Ridgely Tennessee

O: 21AUG2018 13:13:18  36.3N   89.4W md=1.6  ANSS   ENE of Ridgely Tennessee

O: 21AUG2018 09:34:49  36.3N   89.5W md=1.2  ANSS   ENE of Ridgely Tennessee

O: 21AUG2018 03:28:11  36.3N   89.4W md=1.2  ANSS   ENE of Ridgely Tennessee

O: 21AUG2018 02:54:18  36.3N   89.5W md=1.8  ANSS   ENE of Ridgely Tennessee     

P: 14AUG2018 118943    36.5N   89.6W 2.0-4.1 CAAAA  New Madrid area            

P: 19AUG2018 118943    36.0N   91.0W 2.0-4.3 AAAAA  New Madrid area            

 

 

LOMBOK CONTINUES TO SHAKE

 

EARTHQUAKE SUMMARY FOR AUGUST 20, 2018

 

Moderate earthquakes continued to shake the region of Lombok, Indonesia today. Most of these were felt with intensity III-IV in Praya and Lombok, Indonesia.

Others were felt in Klungkung, Bali. Two events of M>=7 have hit the region in Lombok region during August and several large quakes also occurred to the east in Sumbawa and to the west in Java and Bali, Indonesia. Forecast 118870  had expected today's activity was likely around August 18 in the Lombok area.

 

O: 20AUG2018 10:31:32   8.2S  116.5E mb=4.9  EMSC   LOMBOK REGION, INDONESIA     

O: 20AUG2018 22:28:36   8.3S  116.5E ML=4.5  EMSC   LOMBOK REGION, INDONESIA

O: 20AUG2018 11:38:47   8.4S  116.9E mb=4.4  EMSC   LOMBOK REGION, INDONESIA

O: 20AUG2018 13:25:14   8.4S  116.9E mb=4.5  EMSC   LOMBOK REGION, INDONESIA

O: 21AUG2018 01:09:25   8.5S  116.9E Mw=5.1  EMSC   LOMBOK REGION, INDONESIA

P: 18AUG2018 118870     9.0S  116.0E 4.0-5.5 AAAAA  So. of Lombok              

 

The strongest earthquake in the world today occurred as an aftershokc in the Fiji Islands of M 5.5. This joined four other moderate aftershocks in the area today. This is aftershock activity of the M 8.2 quake of August 19 in Fiji. Forecast 119064 expected this activity in mid-August.

 

O: 21AUG2018 06:28:56  18.0S  178.0W mb=5.0  EMSC   FIJI REGION

O: 20AUG2018 22:56:16  18.1S  178.0W mb=4.5  EMSC   FIJI REGION

O: 20AUG2018 08:37:58  18.1S  178.2W Mw=5.5  EMSC   FIJI REGION

O: 21AUG2018 03:28:07  18.2S  178.4W mb=4.2  EMSC   FIJI REGION

O: 20AUG2018 11:40:05  18.3S  178.2W mb=4.9  EMSC   FIJI REGION                  

P: 13AUG2018 119064    19.0S  176.0W 4.0-5.5 CABAA  Tonga Islands              

P: 14AUG2018 119064    18.0S  175.0W 4.0-5.5 CACAA  Tonga Islands              

 

The most unusual earthquake of the day was an M 5.1 in the Phoenix Islands, Kiribati north of Samoa. This is not a seismic area but has seen moderate events in the past. The last such event of M>=5.1 in the area occurred more than 30 years ago. No earthquakes of any size have been recorded within about 300 km of this epicenter since 1990. This event is probably related to the M 8.2 Fiji Islands quake of August 19, 2018.

 

O: 20AUG2018 20:08:30   3.1S  172.8W mb=5.1  EMSC   PHOENIX ISLANDS, KIRIBATI REGI

 

Moderate quakes also occurred today in northern Italy. These were felt with intensity III-IV in Emilia-Romagna at Modena, Correggio and Parma, Italy among other locations. The last event within about 200 km of this epicenter with M>=4.0 was an M 4.3 on May 3, 2018 and prior to that an M 4.4 on March 5, 2018. Forecast 118985 had expected this event was likely in mid-August.

 

O: 21AUG2018 00:33:45  44.8N   10.7E ML=4.0  EMSC   NORTHERN ITALY               

P: 16AUG2018 118985    44.0N   11.0E 3.0-5.3 BAAAA  Italy                      

 

The strongest earthquakes in the U.S. or Canada today was an M 4.4 in Northern Alaska southeast of Prudhoe Bay, Alaska. These events are located at the fourth node (90 degrees) from the M 8.2 in Fiji of August 19 and were probably enhanced from that event. Forecast 119049 expected this activity in mid-August.

 

O: 21AUG2018 06:16:02  69.5N  144.2W ML=3.5  EMSC   NORTHERN ALASKA

O: 21AUG2018 05:47:36  69.5N  144.6W ML=3.3  EMSC   NORTHERN ALASKA

O: 20AUG2018 21:44:03  69.6N  144.2W Ml=3.0  EMSC   NORTHERN ALASKA

O: 20AUG2018 09:24:10  69.6N  144.2W Ml=3.3  EMSC   NORTHERN ALASKA

O: 20AUG2018 19:58:30  69.6N  144.2W Ml=3.4  EMSC   NORTHERN ALASKA

O: 20AUG2018 22:30:17  69.6N  144.7W Ml=3.0  EMSC   NORTHERN ALASKA

O: 20AUG2018 07:31:17  69.6N  145.0W Ml=3.0  EMSC   NORTHERN ALASKA

O: 20AUG2018 22:46:38  69.7N  145.0W Ml=3.2  EMSC   NORTHERN ALASKA

O: 20AUG2018 09:33:48  69.7N  145.3W ML=4.4  EMSC   NORTHERN ALASKA               

P: 13AUG2018 119049    71.0N  134.0W 2.5-3.9 BBBAA  Yukon Territory, Canada    

 

DEADLY SEISMICITY CONTINUES TO ROCK LOMBOK. INDONESIA

 

EARTHQUAKE SUMMARY FOR AUGUST 19, 2018

 

Strong to major earthquakes continued today in the aftershock sequence near Lombok, Indonesia. A major quake of M 6.9-7.0 shook the region around local solar midnight killing 13 with three more in a strong aftershock. Additional damage occurred to built structures. This may have been promoted by tidal and geomagnetic stresses. It follows a strong geomagnetic storm and is located within about 10 degrees of the geomagnetic equator. The mainshock was reported by NEIC with intensity V in Praya and Bima, Indonesia; IV in Sinjai, Sulawesi, in Bali at Karangasem, Klungkung, Ubud, Denpasar, Kuta. Lesser shaking occurred up to about 500 km of the epicenter with intensity II-III in Pare, Jember, Banyuwangi,  Java, Makasar and Sombaopu, Sulawesi, and in Bali at Negara, Singaraja, Tabanan, Kuta, and Mataram, Indonesia.  The moderate earthquakes including events of M 5.1, M 5.2, M 5.3, 5.5 and M 5.9 were felt with intensity II-III in Sumbawa, Mataram, Singaraja, Bali, Klungkung, Kuta, Ubud, Denpasar, and Bima, Indonesia. The death toll of the M 7.0 in the area of August 5 is now at 460. Additional deaths occurred today and in other strong aftershocks. Hundreds of thousands of buildings have been damaged or destroyed in these earthquakes. Forecast 118870 had expected this activity was likely around August 18.

 

O: 20AUG2018 05:46:00   8.2S  116.2E ML=4.1  EMSC   LOMBOK REGION, INDONESIA

O: 19AUG2018 23:29:55   8.2S  116.5E mb=4.6  EMSC   LOMBOK REGION, INDONESIA

O: 19AUG2018 18:18:36   8.2S  116.6E ML=4.9  EMSC   LOMBOK REGION, INDONESIA

O: 19AUG2018 10:42:17   8.3S  116.6E mb=4.7  EMSC   LOMBOK REGION, INDONESIA

O: 19AUG2018 21:44:52   8.3S  116.6E mb=4.7  EMSC   LOMBOK REGION, INDONESIA

O: 19AUG2018 17:28:40   8.3S  116.7E mb=4.8  EMSC   LOMBOK REGION, INDONESIA

O: 19AUG2018 21:50:10   8.4S  116.6E mb=5.1  EMSC   LOMBOK REGION, INDONESIA

O: 19AUG2018 15:28:58   8.4S  116.6E mb=5.5  EMSC   LOMBOK REGION, INDONESIA

O: 19AUG2018 14:56:26   8.4S  116.7E Mw=6.9  EMSC   LOMBOK REGION, INDONESIA

O: 20AUG2018 01:30:34   8.4S  116.7E mb=5.2  EMSC   LOMBOK REGION, INDONESIA

O: 19AUG2018 09:50:10   8.4S  116.8E mb=4.8  EMSC   LOMBOK REGION, INDONESIA

O: 19AUG2018 15:45:56   8.4S  116.8E mb=4.8  EMSC   LOMBOK REGION, INDONESIA

O: 19AUG2018 16:21:07   8.4S  116.9E mb=5.0  EMSC   LOMBOK REGION, INDONESIA

O: 19AUG2018 18:23:24   8.4S  116.9E mb=5.2  EMSC   LOMBOK REGION, INDONESIA

O: 19AUG2018 16:37:37   8.4S  116.9E mb=5.3  EMSC   LOMBOK REGION, INDONESIA

O: 19AUG2018 15:16:36   8.5S  116.5E mb=5.8  EMSC   LOMBOK REGION, INDONESIA

O: 19AUG2018 21:21:53   8.5S  117.0E mb=4.9  EMSC   LOMBOK REGION, INDONESIA     

P: 18AUG2018 118870     9.0S  116.0E 4.0-5.5 AAAAA  So. of Lombok              

 

Moderate to strong earthquakes also continued in the Fiji and Samoa Islands today. The strongest of these was an M 5.9 aftershock in Fiji following yesterday's M 8.2-8.3. None of these were reported felt in the area.

 

An M 5.7 expanded the aftershock zone to the north into the Samoa Island region.

As this event is at a shallow focus and is about 500 km to the northeast of the Fiji mainshock, it is probably not a classic aftershock but caused by redistribution of stress in the area. The only other event in the region of Samoa in the past year of M>=5.7 was an M 5.7 on November 20l, 2017. Forecast 119057 had expected activity in Samoa in mid-August. Like the M 8.2 in Fiji yesterday this event occurred within about an hour of local solar noon and was

Probably promoted by geomagnetic effects as described in previous issues of this summary (Samoa/Fiji is 10-15 degrees south of the geomagnetic equator and the Fiji quakes began when this storm was at maximum over the epicenters):

“This continues the strongest geomagnetic storm at high latitudes since June 26, 2018 when high latitude AP reached 33. KP indices at high latitudes reached 7 at mid-day on August 18. This is the first instance of KP>6 in months. Global seismicity, especially within about 15 degrees of the geomagnetic equator and high latitudes is expected to be enhanced through August 22.” (August 18, 2018)

 

probably promoted by high tides and geomagnetic effects from the geomagnetic storm of the past several days, the strongest in more than two months.

 

 

O: 20AUG2018 00:43:07  16.9S  172.6W mb=5.7  EMSC   SAMOA ISLANDS REGION         

P: 15AUG2018 119057    15.0S  175.0W 4.0-5.6 BBCAA  Samoa Islands              

 

O: 19AUG2018 10:49:26  20.5S  177.9W mb=4.4  EMSC   FIJI REGION                  

P: 12AUG2018 119078    21.0S  177.0W 4.0-5.6 CAAAA  Tonga Islands              

 

O: 19AUG2018 19:13:20  17.0S  178.0W mb=4.6  EMSC   FIJI REGION

O: 20AUG2018 00:04:07  17.4S  178.5W mb=4.7  EMSC   FIJI REGION

O: 19AUG2018 18:49:28  17.6S  178.2W mb=5.2  EMSC   FIJI REGION

O: 19AUG2018 08:21:10  17.7S  179.5W mb=4.4  EMSC   FIJI REGION

O: 19AUG2018 07:25:52  17.8S  178.6W mb=4.3  EMSC   FIJI REGION

O: 19AUG2018 10:44:54  17.9S  177.9W mb=4.7  EMSC   FIJI REGION

O: 20AUG2018 06:43:58  17.9S  178.4W mb=4.5  EMSC   FIJI REGION

O: 19AUG2018 09:18:32  18.0S  177.9W mb=4.6  EMSC   FIJI REGION

O: 19AUG2018 18:43:55  18.0S  178.0W mb=5.4  EMSC   FIJI REGION

O: 20AUG2018 00:12:30  18.1S  177.9W mb=4.3  EMSC   FIJI REGION

O: 19AUG2018 23:23:42  18.1S  177.9W mb=4.4  EMSC   FIJI REGION

O: 19AUG2018 08:05:36  18.1S  178.0W mb=4.4  EMSC   FIJI REGION

O: 20AUG2018 00:44:27  18.1S  178.0W mb=4.8  EMSC   FIJI REGION

O: 19AUG2018 11:00:31  18.1S  178.0W mb=5.4  EMSC   FIJI REGION

O: 19AUG2018 10:58:58  18.1S  178.2W mb=4.4  EMSC   FIJI REGION

O: 20AUG2018 06:09:40  18.1S  178.2W mb=4.5  EMSC   FIJI REGION

O: 19AUG2018 08:17:42  18.1S  178.2W mb=5.0  EMSC   FIJI REGION

O: 20AUG2018 00:21:46  18.2S  178.1W mb=4.2  EMSC   FIJI REGION

O: 19AUG2018 06:36:53  18.2S  178.3W mb=5.9  EMSC   FIJI REGION

O: 20AUG2018 02:28:07  18.3S  178.1W mb=4.4  EMSC   FIJI REGION

O: 19AUG2018 07:48:51  18.5S  178.0W mb=4.9  EMSC   FIJI REGION                  

P: 13AUG2018 119064    19.0S  176.0W 4.0-5.5 CABAA  Tonga Islands              

P: 14AUG2018 119064    18.0S  175.0W 4.0-5.5 BACAA  Tonga Islands              

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in the northern slope area east of Prudhoe Bay, Alaska. It was followed by an M 4.1 and many smaller associated shocks. These follow strong regional activity following the strong quakes of late July. Most of these are not felt in this remote area. Forecast 119049 had expected this activity in early August. This is a major increase in this regional seismicity. The area is at the 4th node (90 degrees) from Fiji and may have been promoted from that M 8.2 quake.

 

O: 19AUG2018 10:34:20  69.5N  143.8W Ml=3.0  EMSC   NORTHERN ALASKA

O: 19AUG2018 16:21:13  69.5N  144.2W ML=3.7  EMSC   NORTHERN ALASKA

O: 19AUG2018 20:10:27  69.5N  144.3W ML=3.4  EMSC   NORTHERN ALASKA

O: 20AUG2018 04:13:44  69.5N  144.4W Ml=3.1  EMSC   NORTHERN ALASKA

O: 20AUG2018 05:07:49  69.5N  145.3W Ml=3.0  EMSC   NORTHERN ALASKA

O: 19AUG2018 20:23:22  69.6N  144.2W ML=3.1  EMSC   NORTHERN ALASKA

O: 19AUG2018 08:39:59  69.6N  144.2W ML=3.2  EMSC   NORTHERN ALASKA

O: 19AUG2018 12:30:14  69.6N  144.2W Ml=3.1  EMSC   NORTHERN ALASKA

O: 20AUG2018 00:13:52  69.6N  144.3W ML=3.0  EMSC   NORTHERN ALASKA

O: 20AUG2018 00:50:23  69.6N  144.3W ML=3.1  EMSC   NORTHERN ALASKA

O: 19AUG2018 21:34:19  69.6N  144.7W Ml=3.4  EMSC   NORTHERN ALASKA

O: 19AUG2018 13:32:24  69.6N  144.8W mb=4.5  EMSC   NORTHERN ALASKA

O: 19AUG2018 19:30:07  69.6N  145.4W ML=4.1  EMSC   NORTHERN ALASKA              

P: 13AUG2018 119049    71.0N  134.0W 2.5-3.9 BBBAA  Yukon Territory, Canada    

 

M 8.2 IN FIJI BREAKS SEISMIC DAM

 

EARTHQUAKE SUMMARY FOR AUGUST 18, 2018

 

A great earthquake in Central Fiji of M 8.2 broke the seismic dam at major quakes which has been in effect for more than three months. It was accompanied by a strong series of regional aftershocks including those of M 6.8, 6.3 and 5.9. As this earthquake occurred at about 550 km depth, this is an unusual occurrence as aftershock at this depth are uncommon. Earthquakes of M>=8.2 are very rare. This is the first such event in the world with M>=8.2 since an M 8.3 in central Chile which occurred September 16, 2015. Such events often change global seismicity shutting down some areas and activating others. The maishock is located at 45 degrees from the activity in Hawaii and has shown a number of regional shocks in the past week.

 

In previous issues of this summary it had been noted that the end of the eruption of Kilauea as defined here as the cessation of earthquakes of M>=3 would be followed by a major change in seismicity around the Pacific Rim and globally as stress would again be able to build up leading to larger events as noted in previous summaries (see also August 6, 2018):

 

" in this summary it had been speculated that the type of change seen today in Hawaii (end of eruption) could precede a major increase in global seismicity especially around the Pacific Rim as:

 

"Clearly, the current quiet is highly anomalous. The continuous microseisms from

Hawaii during the current period is possibly preventing the buildup of stress around the Pacific Rim and may be promoting the current quiet period. As the eruption of Kilauea diminishes it is likely that an upsurge of strong seismicity around the Pacific Rim (and other areas of the world) will occur." (August 5, 2018)

 

and

 

"... There have been no earthquakes of M>=6.5 in the world in nearly three months since the Hawaiian eruption began. It is possible that microseisms from Hawaii are preventing the build up of stress and allowing smaller events to replace larger. This could change as the eruption in Hawaii becomes less energetic." (July 30, 2018)

 

During the three months (90 days) between the M 6.9 on May 4, 2018 and the cessation of earthquakes of M>=3 in Hawaii on August 4, 12 earthquakes of M>=6 were recorded by NEIC around the world including two of M>=6.4, both of M 6.4 in Vanuatu and in Lombok, Indonesia. In the 13 days since the eruption 12 earthquakes (including four today) of M>6 have occurred including four of M>=6.4. This is a rate increase of nearly 700% at this magnitude level since the end of events of M>=3 in the Hawaii eruption.

 

Far-field triggering from the M 8.2 in Fiji should occur several degrees shorter than their normal range because of the great depth at 558 km. For example areas which normally trigger at about 103 degrees from surface epicenters will probably occur at 99-102 degrees from Fiji. This includes areas such as the South Sandwich Islands, Southeast Asia and central Chile among others.  

 

There have been no great earthquakes in Fiji (M>=8) since 1990. The last major quake in the region was an M 7.6-7.7 on August 18, 2002. Great earthquakes were reported in Fiji on April 16, 1937 (M 8.1); April 30 and January 1, 1919 (M 8.3, 8.4); June 26, 1917 (M 8.7) June 26, 2013 (M 8.2) and January 4, 2003 (M 8.0).

 

The earthquakes in Fiji, including many aftershocks were reported by NEIC to have been felt with light to moderate intensity in Suva, Central Fiji Islands.

The M 8.2 mainshock was reported with intensity V in Nausori and II-III in Suva, Namosi, and Nadi, Fiji and in Tonga at Tofoa-Koloua and Vaini, Tongatapu. No tsunami was reported nor observed due to the deep focus of the mainshock and aftershocks.

 

Forecast 119064 had expected the area was likely to be active in mid-August.

 

O: 19AUG2018 02:01:27  16.7S  179.8W mb=4.7  EMSC   FIJI REGION

O: 19AUG2018 04:28:58  17.0S  178.0W Mw=6.8  EMSC   FIJI REGION

O: 19AUG2018 01:34:20  17.5S  178.6W mb=5.0  EMSC   FIJI REGION

O: 19AUG2018 05:19:57  17.8S  179.7W mb=5.5  EMSC   FIJI REGION

O: 19AUG2018 00:39:07  17.9S  177.9W mb=5.7  EMSC   FIJI REGION

O: 19AUG2018 00:58:31  17.9S  178.0W mb=5.4  EMSC   FIJI REGION

O: 19AUG2018 04:15:32  18.0S  178.0W mb=4.6  EMSC   FIJI REGION

O: 19AUG2018 01:17:42  18.1S  177.9W mb=4.9  EMSC   FIJI REGION

O: 19AUG2018 06:19:18  18.1S  178.0W mb=4.8  EMSC   FIJI REGION

O: 19AUG2018 00:19:37  18.1S  178.1W Mw=8.2  EMSC   FIJI REGION

O: 19AUG2018 05:45:26  18.1S  178.3W mb=4.8  EMSC   FIJI REGION

O: 19AUG2018 03:06:52  18.2S  177.9W mb=5.3  EMSC   FIJI REGION

O: 19AUG2018 01:57:41  18.2S  178.1W mb=4.5  EMSC   FIJI REGION

O: 19AUG2018 05:58:36  18.2S  178.3W mb=4.9  EMSC   FIJI REGION

O: 19AUG2018 00:52:32  18.2S  178.3W mb=5.5  EMSC   FIJI REGION

O: 19AUG2018 06:36:53  18.2S  178.3W mb=5.9  EMSC   FIJI REGION

O: 19AUG2018 01:39:52  18.3S  178.0W mb=4.6  EMSC   FIJI REGION

O: 19AUG2018 00:55:45  18.3S  178.1W Mw=5.6  EMSC   FIJI REGION

O: 19AUG2018 02:18:52  18.3S  178.3W mb=5.9  EMSC   FIJI REGION

O: 19AUG2018 00:23:02  18.4S  178.0W mb=6.3  EMSC   FIJI REGION

O: 19AUG2018 06:06:58  18.4S  178.5W mb=4.4  EMSC   FIJI REGION                  

P: 13AUG2018 119064    19.0S  176.0W 4.0-5.5 CABAA  Tonga Islands              

P: 14AUG2018 119064    18.0S  175.0W 4.0-5.5 CACAA  Tonga Islands              

 

 

An aftershock of M 6.3 also shook the island of Lombok today. Initial reports did not indicate major damage or casualties although additional damage to buildings was reported  from northern Lombok. NEIC reported maximum intensity V in Mataram with intensity VI in Sinjai, Sulawesi. The shaking was felt within about 200 km of the epicenter in Kediri, Java and in Bali at Negara, Singaraja, Tabanan, Kuta, Denpasar, Ubud, Klungkung, Karangasem and in Pray, Indonesia.

A foreshock of M 5.4 four minutes before the M 6.3 was also felt in Parya and Java. Forecast 118870 had expected this event was likely around August 18,

 

O: 19AUG2018 04:10:24   8.3S  116.6E Mw=6.3  EMSC   LOMBOK REGION, INDONESIA     

O: 19AUG2018 04:06:13   8.4S  116.6E mb=5.4  EMSC   LOMBOK REGION, INDONESIA     

P: 18AUG2018 118870     9.0S  116.0E 4.0-5.5 AAAAA  So. of Lombok              

 

An earthquake of M 5.6 near the Colombia-Panama area today was reported by NEIC

to have been felt with intensity IV in Otanche and II-III in Turbo, Medellin, Colombia and in  Panama at Ancon, Balboa, Alto de la Estancia and Volcan. The antipode of this epicenter is 9S 103E south of Sumatra, an area which may see antipodal triggering in the next several days. The last earthquake with M>=5.6 in this area of Colombia within about 200 km was an M 5.9 on July 29, 2015.

Forecast 118846 had expected this event to the south around August 19.  The epicenter of the M 5.6 is located at 103 degrees from Fiji and was probably promoted from that source. Seismic energy from large events concentrates at the surface in the period following those and can help triggering additional seismicity.

 

O: 18AUG2018 19:39:06   8.7N   77.3W Mw=5.6  EMSC   PANAMA-COLOMBIA BORDER REGION

P: 19AUG2018 118846     5.0N   78.0W 4.0-5.6 ACAAA  Colombia                   

 

Moderately strong earthquakes continued today in the Volcano Islands, Japan.  The largest today was an M 5.8 felt in the Iwo Jima, Japan area. These follow triggered activity from Typhoon Soulik three days ago of M 6.0 and 6.4.  Today's activity was closely associated with the passage of Typhoon Cimaron (TS 23W) past these epicenter. This had been expected in this summary as:

 

"Typhoon Cimaron (TS 23W) continued today east of the central Mariana Islands with winds up to 45 kts. It is expected track to the northwest reaching the Volcano Islands around August 21-22. At that time a moderate to strong aftershock in the Volcano Islands is likely." (August 18-19, 2018)

 

Forecast 118919 had expected this activity was likely around August 16 within about 50 km of these epicenters.

 

O: 19AUG2018 04:05:44  23.5N  143.5E Mw=5.8  EMSC   VOLCANO ISLANDS, JAPAN REGION

O: 19AUG2018 04:11:15  23.6N  143.4E mb=4.7  EMSC   VOLCANO ISLANDS, JAPAN REGION

P: 16AUG2018 118919    23.0N  144.0E 4.0-5.6 BAAAA  Volcano Islands            

 

COSTA RICA AND FLORES, INDONESIA FEEL STRONG EARTHQUAKES

 

EARTHQUAKE SUMMARY FOR AUGUST 17, 2018

 

The global seismic activation of large quakes following the shutdown of the

eruption at Kilauea continued today with two strong earthquakes - an M 6.1 in

Costa Rica and an M 6.6-6.7 deep beneath Flores, Indonesia. The strong earthquake of M 6.1 in Costa Rica today was widely felt in that area. There were no immediate reports of major damage or casualties. NEIC reported it was felt with intensity VI in Costa Rica at Golfito and Finca Blanco; IV in San Vito, and Mercedes, Costa Rica and in Panama at Palmira, Cerro Punta, Volcan. Lesser shaking of II-III was reported from Costa Rica at Puerto Cortes, and in Panama at Boquete and Potrerillos Abajo. An aftershock of M 4.6 was reported with intensity IV in Boquete, Chiriqui, Panama and Parrita, Puntarenas, Costa Rica.

The last earthquake with M>=6.1 in Costa Rica within about 200 km of today's epicenters occurred November 13, 2017 with M 6.5 about 200 km northwest of today's epicenter. The last within about 100 km was an M 6.2 on November 19, 2008. Forecast 118847 had expected today's mainshock was likely within about 25 km of the epicenter around August 19.

 

O: 18AUG2018 05:50:30   8.5N   83.2W ML=4.0  EMSC   COSTA RICA

O: 18AUG2018 03:05:30   8.5N   83.2W ML=4.3  EMSC   COSTA RICA

O: 17AUG2018 23:55:30   8.6N   83.2W ML=4.0  EMSC   COSTA RICA

O: 18AUG2018 00:25:30   8.6N   83.2W ML=4.0  EMSC   COSTA RICA

O: 18AUG2018 02:53:30   8.6N   83.2W ML=4.0  EMSC   COSTA RICA

O: 17AUG2018 23:49:37   8.7N   83.1W Mw=4.6  EMSC   COSTA RICA

O: 17AUG2018 23:22:27   8.7N   83.2W Mw=6.1  EMSC   COSTA RICA                   

P: 19AUG2018 118847     9.0N   83.0W 3.5-5.1 AAAAA  Costa Rica                 

 

The strongest earthquake in the world today was an M 6.5-6.7 at a deep focus in the Flores Islands, Indonesia. Because of its deep focus it was widely felt within about 1000 km but did little or no damage. NEIC reported it was felt with intensity II-III in Ruteng, Praya, and Mataram, Nusa Tenggara Barat; in Bali at Klungkung, Ubud, Denpasar, Kuta, Tabanan and at Dare, Dili, East Timor among others. BMG reported it at M 6.7 and was felt with intensity IV in Bima, Lombok; III-IV in Waingapu, III in Mataram, Loteng, Kuta; II-III in Denpasar; II in Lobar and I in Makassar and Mamuju, Flores, Indonesia. This is the second strongest earthquake in the world since May 4, 2018 when  Hawaii was hit by an M 6.9 associated with the eruption of Kilauea Volcano. The other was the M 7.0 in Lombok, Indonesia of August 5. Today's epicenter is about 400 km northeast of the Lombok area and was probably promoted by regional redistribution of stress. Forecast 118876 had expected today's event within about 100 km of this epicenter was likely around August 13.

 

O: 17AUG2018 15:35:02   7.4S  119.8E Mw=6.5  EMSC   FLORES SEA                   

O: 17AUG2018 15:35:00  07.6S  119.9E MS=6.7  BMG  Felt with intensity IV

P: 13AUG2018 118876     8.0S  119.0E 4.0-5.7 BAAAA  Sumbawa Island area        

 

Aftershocks in the Volcano Islands, Japan, continued today following the M 6.0 and 6.4 which accompanied landfall of Typhoon Soulik two days ago. A new typhoon is taking the same path (TS 23W) and will pass over the aftershock zone August 21-22 and may enhance regional seismicity at that time as noted in this summary:

 

TS 23W formed today east of the central Mariana Islands with winds up to 45 kts. It is expected track to the northwest reaching the Volcano Islands around August 21-22. At that time a moderate to strong aftershock in the Volcano Islands is likely. It is expected to reach southern Honshu, Japan around August 23. After that, a moderate to strong quake in Japan could occur.

 

The strongest earthquake in the Volcano Islands today was an M 5.6. It was felt with moderate intensity in Iwo Jima, Japan according to JMA. Forecast 118919 had expected this activity was likely within about 50 km of these epicenters around

August 16.

 

O: 17AUG2018 10:15:26  23.3N  143.8E mb=4.8  EMSC   VOLCANO ISLANDS, JAPAN REGION

O: 17AUG2018 22:12:21  23.4N  143.3E mb=4.9  EMSC   VOLCANO ISLANDS, JAPAN REGION

O: 17AUG2018 22:48:22  23.4N  143.4E mb=4.8  EMSC   VOLCANO ISLANDS, JAPAN REGION

O: 17AUG2018 22:06:59  23.5N  143.2E Mw=5.6  EMSC   VOLCANO ISLANDS, JAPAN REGION

O: 17AUG2018 22:44:46  23.5N  143.4E mb=5.0  EMSC   VOLCANO ISLANDS, JAPAN REGION

O: 17AUG2018 18:15:32  23.5N  143.6E mb=4.7  EMSC   VOLCANO ISLANDS, JAPAN REGION

P: 16AUG2018 118919    23.0N  144.0E 4.0-5.6 AAAAA  Volcano Islands            

 

The strongest earthquake today in the U.S. or Canada was an aftershock of the series in Northern Alaska. Today's event of M 4.5 was lightly felt in the area southeast of Prudhoe Bay. Forecast 119049 had expected this series around  August 13, the day the mainshocks occurred. No major damage has been reported with these remote earthquakes but minor damage to oil facilities may be expected.

 

O: 18AUG2018 04:39:37  69.6N  144.3W ML=4.5  EMSC   NORTHERN ALASKA              

P: 13AUG2018 119049    71.0N  134.0W 2.5-3.9 BBBAA  Yukon Territory, Canada    

 

The most unusual earthquake in the U.S. today was an M 2.3 in the area of Mississippi. It was not reported felt in this area. A pair of events at about this magnitude occurred in early May, 2015. Forecast 118943 expected regional seismicity around August 14.

 

O: 17AUG2018 23:27:27  33.5N   89.4W Md=2.3  EMSC   MISSISSIPPI                  

P: 14AUG2018 118943    36.5N   89.6W 2.0-4.1 BCAAA  New Madrid area            

 

TS SOULIK TRIGGERS TWO LARGE VOLCANO ISLANDS EARTHQUAKES

 

EARTHQUAKE SUMMARY FOR AUGUST 16, 2018

 

A pair of strong earthquakes in the Volcano Islands of M 6.0 and 6.3-6.4 today were likely triggered by the passage of Typhoon Soulik over the epicenter today. Typhoon Soulik has winds up to 80 kts. This storm is expected to pass to the northwest over the next several days reaching Kyushu, Japan around August 21.  This is a classic example of weather-related seismic triggering. Several strong storms have battered the Volcano Islands in recent days, the last was TS Leepi which passed over these epicenters August 12. As noted in this summary at the time stresses from this storm probably were instrumental in enhancing today's activity in the area:

 

"TS Leepi (TD 19W) continued today over the Volcano Islands with winds up to 075 kts. It is expected to track to the north through early August and not to make landfall reaching the northern Ryukyu Islands around August 15.  Seismicity in the Volcano and northern Marianas is expected to be enhanced by Leepi through August 14." (August 11-14, 2018)

 

A month ago a pair of foreshocks in the Volcano Islands were apparently triggered by the passage of Super-Typhoon Maria as noted at the time in this summary:

 

"Two moderate earthquakes of M 5.0 and 5.1 occurred in the Volcano Islands near Iwo Jima, Japan today. They were not reported felt but illustrate the relation between strong weather systems and subsequent seismicity. In this summary in previous issues the Volcano Islands had been emphasized as a possible site of enhanced seismicity with the passage of Super-Typhoon Maria as:

 

"Super-Typhoon Maria (TS 10W) continued today over Guam with winds up to 150 kts. It is expected to track to the northwest passing over Guam as a typhoon on

July 5-6. This storm could trigger a moderate to large quake in the region of Guam and the southern Mariana Islands which are currently seeing seismicity at moderately high levels." (July 7-9, 2018) (July 12, 2018)

 

The last earthquake of M>=6.3 in the Volcano Islands within about 200 km of today's epicenters occurred as an M 7.5 on September 18, 2007 and prior to that on July 3, 2001. Earthquakes also hit the region with M 7.6 on March 28, 2000 and January 1, 1998 (M 6.6). Forecast 118919 had expected today's activity was likely in the Volcano Islands around August 16.

 

O: 16AUG2018 18:21:31  23.4N  143.4E Mw=6.3  EMSC   VOLCANO ISLANDS, JAPAN REGION

O: 16AUG2018 18:22:53  23.4N  143.4E mb=6.0  EMSC   VOLCANO ISLANDS, JAPAN REGION

O: 16AUG2018 18:49:08  23.4N  143.8E mb=4.9  EMSC   VOLCANO ISLANDS, JAPAN REGION

P: 16AUG2018 118919    23.0N  144.0E 4.0-5.6 AAAAA  Volcano Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 5.2 aftershock in the western Andreanof Islands following the M 6.6 there yesterday. It was not reported felt in this remote region. Forecast 119017 had expected today's quake within about 100 km of this epicenter around August 16.

 

O: 16AUG2018 13:27:58  51.1N  177.6W mb=4.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O: 17AUG2018 04:35:30  51.3N  178.1W Mw=5.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 16AUG2018 119017    51.0N  179.9W 3.5-5.1 AABAA  Andreanoff Isls, Aleutians 

 

An earthquake of M 5.3 in southern Italy today continued the moderate quakes in that area. No major damage has been associated with these events over the past several days. Today's M 5.3 was reported in Abruzzen, Italy at Sal Salvo, and San Vito Chietino and IV in Torrevecchia Teatina, Lentella, Campomarino, Casalbordino, with intensity II-III in Agnone, Molise; San Severo, Apulien, and in Abruzzen at Campo de Giove and Pescara and in general within about 150 km of the epicenter. Forecast 118984 had expected this activity within about 25 km of this epicenter was likely between August 15 and 19.

 

O: 16AUG2018 20:22:35  41.8N   14.8E mb=4.5  EMSC   SOUTHERN ITALY               

O: 16AUG2018 19:28:38  41.9N   14.8E ML=3.6  EMSC   SOUTHERN ITALY               

O: 16AUG2018 18:19:06  41.9N   14.8E Mw=5.3  EMSC   SOUTHERN ITALY                

P: 15AUG2018 118984    43.0N   14.0E 3.0-5.2 ABAAA  Italy                      

P: 19AUG2018 118984    42.0N   15.0E 3.0-4.9 BAAAA  Italy                      

 

ANDREANOF ISLAND QUAKE LIKELY TRIGGERED BY STRONGEST GEOMAGNETIC STORM SINCE JUNE

 

EARTHQUAKE SUMMARY FOR AUGUST 15, 2018

 

Another strong earthquake hit Alaska today. This event is in the western Andreanof Islands, Aleutians with M 6.6. It was reported by NEIC to have been felt with intensity VI in Adak, Alaska. It was also reported felt with light intensity in Unalaska and Anchorage, Alaska. It occurred following the strongest geomagnetic storm at high latitudes since June. The epicenter is under the auroral ring current and could have been triggered by this storm. This appears to continue strong seismic enhancement in Alaska and at other high latitudes, especially in areas near 103 degrees from Lombok, Indonesia which has occurred over the past week.

 

The geomagnetic field saw disturbed conditions today. The AP level was 14. High latitude geomagnetic field saw active conditions  with AP at 30. The is the strongest geomagnetic storm at high latitudes since June 26, 2018 when high latitude AP reached 33. The KP level at high latitudes reached 6 from 1800-2100 UT. This is the first time that KP index has reached 6 for more than three hours in more than a month. This storm may have helped triggered the earthquake in the Andreanof Islands which occurred near local solar noon at 22:00 UT.

 

The M 6.6 in the Andreanof Islands is the strongest in the U.S. since the M 6.9 in Hawaii of May 4, 2018 and the strongest in Alaska since the M 7.9 in the Gulf of Alaska of January 23, 2018. Earthquakes of M>=6.6 have hit the region of the western Andreanof Islands on three occasions since 1990 - an M 6.6 on May 2, 2008; an M 6.9 on March 20, 1999 and events of M 7.9 and 7.3 on June 10, 1996. When an outer-rise earthquake occurred south of this epicenter with M 4.7 on  August 10, 2018, this summary noted the possibility of a strong upcoming quake in the subduction zone to the north as:

 

 

"The strongest earthquake in the U.S. or Canada today was also at high latitudes. ... The last to occur south of 50N latitude was an M 4.9 on August 18, 2013. ...  The epicenter is south of the normal activity in the area and may be an outer-bank earthquake suggesting a larger upcoming event at this longitude in  the Andreanof Islands, Alaska. The last earthquake of M>=4.7 within 100 km of today's epicenter was an M 4.7 on May 11, 2014." (August 11, 2018)

 

 

O: 10AUG2018 11:26:38  50.0N  178.3W mb=4.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O: 10AUG2018 11:26:38  49.9N  178.3W mb=4.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  9AUG2018 118757    50.9N  179.0W 3.5-5.2 AAAAA  Andreanoff Isls, Aleutians" (August 11, 2018) 

 

 

It has been proposed that outer-rise earthquakes such as this are an indication

that the plate is buckling on the outer rise of the subduction zone in this area of the zone. This has been taken to be an indication of abnormal blockage in the subduction zone which can be relieved by a strong earthquake as occurred in this case.

 

Forecast 119017 had expected the region would likely be active between August 13 and 16.

 

O: 15AUG2018 22:16:08  51.4N  178.0W mb=4.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O: 15AUG2018 21:56:57  51.5N  178.0W Mw=6.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 16AUG2018 119017    51.0N  179.9W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

P: 13AUG2018 119017    51.6N  180.0W 3.5-5.3 AAAAA  Andreanoff Isls, Aleutians 

 

The earthquake swarm in northern Nebraska resumed today with an M 2.7 near Stapleton, Nebraska. It as reported felt with intensity II in Stapleton and possibly in Sioux City, Iowa (NEIC). Earthquakes in South Dakota and Nebraska often precede strong earthquakes in Alaska as has been previously documented in this summary. This region became active in April, 2018 and resumed in early July with the strongest regional event an M 4.2 on June 30. An earthquake of M 3.5 in South Dakota hit north of this on July 21 prior to the events in Northern Alaska.

 

O: 15AUG2018 13:57:50  41.4N  100.1W mb=2.7  EMSC   NEBRASKA                     

 

Moderate aftershocks also continued in Northern Alaska today. The strongest of these were an M 4.7 and 4.8 and were felt lightly in northern Alaska. These are aftershocks of the M 6.4 and 6.0 on August 12 east of Prudhoe Bay, Alaska.  Forecast 118790 had expected this activity in mid-August.

 

O: 16AUG2018 07:22:40  69.6N  144.2W Ml=4.7  EMSC   NORTHERN ALASKA

O: 16AUG2018 06:32:31  69.6N  144.8W mb=4.8  EMSC   NORTHERN ALASKA

P:  9AUG2018 118790    67.0N  135.0W 2.5-3.9 CCBAA  Yukon Territory, Canada    

 

Two moderate earthquakes of M 4.5 and 3.7 occurred in southeastern Asia today. The last earthquake of M>=3.7 in Laos within about 100 km of today's epicenter was an M 4.7 on April 18, 2017. This activity may be related to landfall of TS Bebinca in Laos today. This had been expected in the previous issue of this summary as:

 

"TS Bebinca (TD 20W) continued south of Hong Kong, China with winds up to 45 kts. It is expected to turn to the west continuing offshore for several days before dissipating over Laos and Vietnam around August 18. Some promoted seismicity is expected with this storm at this time.  This is likely to occur on strike-slip faults across southern Asia." (August 14-15, 2018)

 

O: 16AUG2018 06:50:14  16.0N   96.8E ML=4.5  EMSC   NEAR SOUTH COAST OF MYANMAR  

P: 18AUG2018 118878    17.0N   94.0E 4.0-5.4 AACAA  Andaman Islands            

 

O: 15AUG2018 18:25:43  20.9N  100.2E ML=3.7  EMSC   LAOS                         

P: 11AUG2018 118638    20.0N   96.0E 4.0-5.5 BACAA  Myanmar                    

P: 15AUG2018 118911    21.0N   95.0E 4.0-5.5 AACAA  Myanmar                     

 

Another event today which may have been promoted by a tropical storm was an

M 4.7 south of the Mariana Islands and Guam. This had been expected in association with TS Soulik (now a named storm) in the previous issue of this summary as:

 

"A tropical cyclone may be forming southeast of Guam. This system is currently located at 11N 147E and moving towards Guam with winds up to 20 kts. Seismicity in Guam is sensitive to local storms and a moderate earthquake in this area is likely in the next three days." (August 14-15, 2018)

 

O: 15AUG2018 19:34:52  11.8N  143.6E mb=4.7  EMSC   SOUTH OF MARIANA ISLANDS     

P: 11AUG2018 118628    11.0N  141.0E 4.0-5.7 BABAA  So. Marianas/Guam          

 

 

MODERATE M 4.4 SHAKES SOUTHERN CALIFORNIA

 

EARTHQUAKE SUMMARY FOR AUGUST 14, 2018

 

A moderate earthquake of M 4.4 hit Southern California today in the Aguanga region southeast of Los Angeles. NEIC reported it was felt with intensity V in Aguanga and IV in Anza, California. Lesser shaking of intensity II-III was felt in Temecula, Hemet, Pauma Valley, Warner Springs, Valley Center, Winchester, Santa Ysabel, Mountain Center, Murrieta, Idyllwild, San Jacinto, Palm Springs, Menifee, Escondido, Bonsall, Fallbrook, Homeland, Sun City, Wildomar, Vista, Nuevo, San Marcos, Rancho Mirage, Escondido, Ramona, Cathedral City, Oceanside, Indian Wells, La Quinta, Vista, San Marcos, San Diego, Indio, Poway, San Juan Capistrano, Santee, Santee, San Clemente, and in general within about 100-150 km of the epicenter. Several aftershocks were also lightly felt. The last earthquake in the Aguanga, California area within about 50 km of this epicenter was an M 5.2 on June 10, 2016 about 40 km to the east of today's epicenter.

Forecast 118956 expected today's event was likely within 10-15 km of this epicenter around August 17. The epicenter is located at 103 degrees from the M 7.5 in Papua New Guinea and may have been promoted from that source.

 

O: 14AUG2018 23:55:24  33.5N  116.8W ML=2.0  EMSC   SOUTHERN CALIFORNIA          

O: 15AUG2018 01:29:00  33.5N  116.8W ML=2.0  EMSC   SOUTHERN CALIFORNIA          

O: 15AUG2018 01:16:16  33.5N  116.8W ML=2.1  EMSC   SOUTHERN CALIFORNIA          

O: 15AUG2018 01:40:06  33.5N  116.8W ML=2.2  EMSC   SOUTHERN CALIFORNIA          

O: 15AUG2018 04:48:23  33.5N  116.8W ML=2.2  EMSC   SOUTHERN CALIFORNIA          

O: 15AUG2018 01:27:04  33.5N  116.8W ML=2.3  EMSC   SOUTHERN CALIFORNIA          

O: 15AUG2018 03:56:33  33.5N  116.8W ML=2.3  EMSC   SOUTHERN CALIFORNIA          

O: 15AUG2018 01:53:37  33.5N  116.8W ML=3.0  EMSC   SOUTHERN CALIFORNIA          

O: 15AUG2018 01:24:26  33.5N  116.8W Mw=4.4  EMSC   SOUTHERN CALIFORNIA          

P: 17AUG2018 118956    33.4N  116.7W 2.5-4.8 AAAAA  So. California             

 

The activity in southern California today was not the only unusual quake in the region. An M 3.5 near Parkfield in central California also occurred but was only slightly felt in the region. This event occurred near local solar noon and may have been affected by tidal stresses. The last event of M>=3.5 within about 50 km of this epicenter was an M 3.5 on April 13, 2017 and a similar M 3.5 on March 13, 2017. The last near Parkfield was an M 3.5 on May 17, 2016.  Forecast 118928 had expected this region could see activity around August 16 within about 50 km of today's epicenter.

 

NEIC reported this earthquake of M 3.5 in Parkfield, California was felt with intensity II-III in the area(s) of San Miguel and possibly Carmel Valley, California. This epicenter is at the third node (120 degrees) from the M 7.0 in Lombok, Indonesia.

 

O: 14AUG2018 21:52:11  35.9N  120.5W Mw=3.5  EMSC   CENTRAL CALIFORNIA           

P: 16AUG2018 118928    36.1N  120.1W 2.5-4.4 AAAAA  Central California         

 

A moderate earthquake of M 4.8 also shook southern Italy today in the Molise area. NEIC reported maximum intensity V in this area at Santa Croce de Magliano and Guglionesi with IV in Montenero di Bisaccia, Larino, Montemitro, San Giacomo degli Sciavoni, Campomarino. It was felt as far as 150 km from the epicenter including at Naples, Italy. This event was not associated with the bridge collapse in Italy which also occurred today. The last earthquake in Italy with M>=4.9 within about 200 km of this epicenter occurred on January 18, 2017, an aftershock of the M 6.6 in eastern Italy of October 30, 2016. The last such within about 100 km  was an M 5.2 on December 29, 2013.

Forecast 118984 had expected today's event was likely in mid-August. This earthquake epicenter is located at 104 degrees from the Lombok event of M 7.0 a distance at which strong triggering has been seen in recent days.

 

O: 14AUG2018 21:48:32  41.9N   14.7E mb=4.9  EMSC   SOUTHERN ITALY               

P: 15AUG2018 118984    43.0N   14.0E 3.0-5.2 ABAAA  Italy                      

P: 19AUG2018 118984    42.0N   15.0E 3.0-4.9 BAAAA  Italy                      

 

An unusual earthquake of M 4.5 also occurred in the region of Crimea, Ukraine today. There were no initial reports of damage but some probably occurred. It is interesting to note that this epicenter at 35.2E is opposite the longitude of the Alaskan events at 144.8W. This may be related to tidal stresses associated with the past new moon as noted earlier in these summaries:

 

 

"The new moon will arrive at 09:58 UT on August 11, 2018. Longitudes which are sub-solar at this time center near 30 East and 150 West. These include eastern Europe and the African Rift valley in the east and Central Alaska and Hawaii in the west. While these zones are most likely to see tidal triggering as the stresses are highest, tidal promotion in the next week can occur in areas outside these longitude zones. Earthquakes most likely to see tidal stress components should occur new local solar noon and midnight when these stresses are maximized." (August 9-12, 2018)

 

Today's earthquake is the strongest in the Crimea area of Ukraine since an M 4.9 on December 10, 2012 and prior to that an M 4.6 on May 19, 2006. Of eight such earthquake in  and near Ukraine since 1990, the largest was an M 6.6 on November 9, 2002, several days after the great Denali, Alaska event of November 3, 2002 (M 7.9). Forecast 118998 had expected this epicenter could be active to the south around August 14.

 

O: 14AUG2018 12:24:11  44.2N   35.2E ML=4.5  EMSC   CRIMEA REGION, UKRAINE       

P: 14AUG2018 118998    41.0N   36.0E 3.5-5.0 ACAAA  No. Turkey/Black Sea       

 

The aftershock sequence in northern Alaska near Prudhoe Bay also continued today. The strongest of these was an M 4.5. These follow mainshocks of M 6.4 and 6.0, the largest since oil extraction began in the area. Forecast 119049 expected this activity was likely around August 13.

 

O: 14AUG2018 16:53:12  69.6N  144.8W mb=4.5  EMSC   NORTHERN ALASKA

P: 13AUG2018 119049    71.0N  134.0W 2.5-3.9 ABBAA  Yukon Territory, Canada    

 

The strongest earthquake in the world today was another in the South Sandwich Islands of M 5.5. This continues the a series in the past several days including an M 6.1 on August 14, 2018. Forecast 119097 had expected today's event was likely around August 19 within about 50 km of this epicenter. Seven events of M>=5.5 have occurred in the South Sandwich Islands during 2018. This earthquake epicenter is located at 106 degrees from the Lombok event of M 7.0 a distance at which strong triggering has been seen in recent days.

 

O: 14AUG2018 18:13:26  58.1S   25.2W mb=5.5  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 19AUG2018 119097    58.0S   26.0W 4.0-5.8 BAAAA  So. Sandwich Islands       

 

STRONG SEISMICITY CONTINUES AT HIGH LATITUDES

 

EARTHQUAKE SUMMARY FOR AUGUST 13, 2018

 

The strongest seismicity of the day continued at high latitudes today. The largest event in the world was an M 6.1 in the South Sandwich Islands north of Antarctica but moderate to large earthquakes also continued in Alaska near the North Slope and Prudhoe Bay where events of M 6.4 and 6.0 occurred yesterday. There were more than 60 aftershocks today in the area with M>=3. The area is remote and only the largest of these have been reported felt. Damage to pipelines carrying oil may have occurred but this has not been reported. The infrastructure of the area is built to withstand earthquakes of this size but much has been in place for decades and may have deteriorated over time. It is unlikely this series of earthquakes will greatly affect oil production and transport from this remote region. Forecast 119049 had expected today's activity in Northern Alaska was likely to the east around August 13. The strongest events in the swarm today were M 4.8, 4.4 and 4.8, 4.3 and 4.3. The activity in northern Alaska is at the seventh node (51 degrees) from Hawaii and was probably promoted by energy from that source. Other activity at this distance from Hawaii occurred in Oklahoma (M 3.0) and the Kuril Islands (M 4.0). The activity in Alaska is also at the fourth node (90 degrees) from the PNG quake of February 25, 2018 and at 101 degrees from the Lombok quake of August 5 (M 7.0). All of these sources probably helped promote the Alaskan quakes at this time.

 

O: 13AUG2018 21:21:05  69.2N  147.9W Ml=3.2  EMSC   NORTHERN ALASKA

O: 13AUG2018 06:58:22  69.4N  144.1W ML=3.4  EMSC   NORTHERN ALASKA

O: 13AUG2018 06:16:43  69.4N  144.1W Ml=3.2  EMSC   NORTHERN ALASKA

O: 13AUG2018 09:55:57  69.4N  144.4W ML=4.4  EMSC   NORTHERN ALASKA

O: 13AUG2018 21:51:26  69.5N  144.1W ML=3.8  EMSC   NORTHERN ALASKA

O: 13AUG2018 22:00:43  69.5N  144.2W ML=3.3  EMSC   NORTHERN ALASKA

O: 13AUG2018 21:40:52  69.5N  144.3W ML=3.8  EMSC   NORTHERN ALASKA

O: 13AUG2018 08:53:14  69.5N  144.3W mb=4.3  EMSC   NORTHERN ALASKA

O: 14AUG2018 02:18:54  69.5N  144.4W Ml=3.2  EMSC   NORTHERN ALASKA

O: 13AUG2018 20:57:21  69.5N  144.5W ML=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 20:05:54  69.5N  144.5W ML=3.4  EMSC   NORTHERN ALASKA

O: 13AUG2018 11:26:46  69.5N  144.5W ML=3.7  EMSC   NORTHERN ALASKA

O: 13AUG2018 16:19:53  69.5N  144.5W ML=3.8  EMSC   NORTHERN ALASKA

O: 13AUG2018 19:36:10  69.5N  144.5W mb=4.8  EMSC   NORTHERN ALASKA

O: 13AUG2018 06:55:50  69.5N  144.6W ML=3.4  EMSC   NORTHERN ALASKA

O: 13AUG2018 22:43:14  69.5N  144.6W Ml=3.2  EMSC   NORTHERN ALASKA

O: 13AUG2018 11:05:13  69.5N  144.7W mb=4.4  EMSC   NORTHERN ALASKA

O: 13AUG2018 14:04:00  69.6N  143.7W Ml=3.3  EMSC   NORTHERN ALASKA

O: 13AUG2018 12:40:50  69.6N  144.0W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 11:47:27  69.6N  144.1W ML=3.8  EMSC   NORTHERN ALASKA

O: 13AUG2018 15:23:09  69.6N  144.1W Ml=3.4  EMSC   NORTHERN ALASKA

O: 13AUG2018 06:37:26  69.6N  144.2W ML=3.8  EMSC   NORTHERN ALASKA

O: 13AUG2018 10:31:04  69.6N  144.2W Ml=3.0  EMSC   NORTHERN ALASKA

O: 13AUG2018 14:18:48  69.6N  144.2W Ml=3.0  EMSC   NORTHERN ALASKA

O: 13AUG2018 16:07:55  69.6N  144.2W Ml=3.0  EMSC   NORTHERN ALASKA

O: 13AUG2018 17:24:41  69.6N  144.2W Ml=3.0  EMSC   NORTHERN ALASKA

O: 13AUG2018 07:12:39  69.6N  144.2W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 08:04:25  69.6N  144.2W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 15:38:45  69.6N  144.2W Ml=3.1  EMSC   NORTHERN ALASKA

O: 14AUG2018 05:30:34  69.6N  144.2W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 11:54:32  69.6N  144.2W Ml=3.5  EMSC   NORTHERN ALASKA

O: 13AUG2018 12:34:32  69.6N  144.2W Ml=3.5  EMSC   NORTHERN ALASKA

O: 14AUG2018 06:06:17  69.6N  144.2W Ml=3.5  EMSC   NORTHERN ALASKA

O: 13AUG2018 11:38:55  69.6N  144.2W Ml=3.6  EMSC   NORTHERN ALASKA

O: 13AUG2018 12:10:44  69.6N  144.2W Ml=3.6  EMSC   NORTHERN ALASKA

O: 14AUG2018 06:31:01  69.6N  144.2W Ml=3.8  EMSC   NORTHERN ALASKA

O: 13AUG2018 07:50:11  69.6N  144.3W ML=3.2  EMSC   NORTHERN ALASKA

O: 13AUG2018 13:04:04  69.6N  144.3W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 15:09:30  69.6N  144.3W Ml=3.3  EMSC   NORTHERN ALASKA

O: 13AUG2018 14:38:43  69.6N  144.3W Ml=3.4  EMSC   NORTHERN ALASKA

O: 13AUG2018 11:29:59  69.6N  144.4W Ml=3.0  EMSC   NORTHERN ALASKA

O: 13AUG2018 23:38:51  69.6N  144.5W ML=3.3  EMSC   NORTHERN ALASKA

O: 13AUG2018 14:36:24  69.6N  144.6W Ml=3.4  EMSC   NORTHERN ALASKA

O: 13AUG2018 13:10:25  69.6N  144.7W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 10:24:28  69.6N  144.7W Ml=3.3  EMSC   NORTHERN ALASKA

O: 13AUG2018 23:00:34  69.6N  144.8W ML=3.7  EMSC   NORTHERN ALASKA

O: 13AUG2018 10:21:44  69.6N  144.8W Ml=3.0  EMSC   NORTHERN ALASKA

O: 13AUG2018 07:46:55  69.6N  144.8W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 13:41:53  69.6N  144.8W Ml=3.4  EMSC   NORTHERN ALASKA

O: 13AUG2018 12:48:17  69.6N  144.8W Ml=3.7  EMSC   NORTHERN ALASKA

O: 13AUG2018 07:29:17  69.6N  144.9W Ml=3.0  EMSC   NORTHERN ALASKA

O: 13AUG2018 23:13:15  69.6N  145.4W ML=3.4  EMSC   NORTHERN ALASKA

O: 13AUG2018 13:35:44  69.6N  145.4W mb=4.3  EMSC   NORTHERN ALASKA

O: 13AUG2018 23:53:11  69.7N  144.1W mb=4.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 18:01:11  69.7N  144.2W Ml=3.4  EMSC   NORTHERN ALASKA

O: 13AUG2018 16:01:26  69.7N  144.2W Ml=3.7  EMSC   NORTHERN ALASKA

O: 13AUG2018 08:41:24  69.7N  144.3W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 11:50:36  69.7N  144.5W Ml=3.2  EMSC   NORTHERN ALASKA

O: 13AUG2018 11:34:47  69.7N  144.6W Ml=3.4  EMSC   NORTHERN ALASKA

O: 13AUG2018 09:57:00  69.7N  144.7W mb=4.8  EMSC   NORTHERN ALASKA

O: 13AUG2018 09:31:59  69.7N  144.8W Ml=3.3  EMSC   NORTHERN ALASKA

O: 13AUG2018 06:25:37  69.7N  145.0W Ml=3.2  EMSC   NORTHERN ALASKA

O: 13AUG2018 21:06:31  69.7N  145.0W Ml=3.2  EMSC   NORTHERN ALASKA

O: 13AUG2018 10:13:34  69.7N  145.0W Ml=3.3  EMSC   NORTHERN ALASKA

O: 13AUG2018 13:01:11  70.1N  145.1W Ml=3.1  EMSC   NORTHERN ALASKA              

P: 13AUG2018 119049    71.0N  134.0W 2.5-3.9 AABAA  Yukon Territory, Canada    

 

The strongest earthquake in the world today was the M 6.1 in the southern South Sandwich Islands. Earthquakes in this area are generally not felt and this was not an exception. The last earthquake within about 250 km of this epicenter in the South Sandwich Islands with M>=6.1 was an M 6.5 about 200 km north of this on May 10, 2017 and prior to that an M 7.2 on May 28, 2016.  Forecast 119097 had expected this earthquake was likely within about 50 km around August 19. This event is 106 degrees from Lombok, Indonesia and was probably promoted by energy from that region which is concentrated at the surface at this distance. The activity in northern Alaska is at 101 degrees from Lombok. Energy from large surface events on the earth reflects and refracts off  internal earth boundaries and is redirected to the surface near this distance. Increased seismicity in this distance zone suggests seismic triggering at this distance.

 

O: 14AUG2018 03:29:52  58.2S   25.3W Mw=6.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 19AUG2018 119097    58.0S   26.0W 4.0-5.8 BAAAA  So. Sandwich Islands        

 

A series of high latitude also occurred today in the northern Reykjanes Ridge. This is a remote area south of Iceland and these earthquakes were not reported felt. The epicenters are near the antipode of the M 5.4 in the Macquarie Island region south of Australia which occurred August 11. As noted in previous summaries, it is not uncommon for antipodal events in these regions. Such activity can be triggered by many physical phenomena which affect the entire earthquake simultaneously and had been noted in the previous three summaries as:

 

"The strongest earthquake in the world today was an M 5.4 in the area west of Macquarie Island, south of Australia. This continue strong activation of this region which included an M 5.6 in the Balleny Islands area yesterday.

 

"The epicenter in the Balleny Islands is at the antipode of the M 3.5 in Iceland and may have helped promote additional activity in Iceland. This activity is expected to continue on an enhanced magnitude level in Iceland over the next several days. (August 11, 2018)"

 

The exact antipode for the Macquarie quake is 55N 34W; the Reykjanes Ridge swarm occurred at 58N 32W with maximum up to M 5.0. The last earthquake in the Reykjanes Ridge within about 250 km of this swarm occurred January 11, 2018 with M 5.0. The last of larger magnitude was an M 5.9 on September 10, 2017.

Forecast 119024 expected this event within about 150 km of these quakes was likely around August 16.

 

O: 14AUG2018 05:55:37  58.3N   31.9W mb=4.6  EMSC   REYKJANES RIDGE              

O: 14AUG2018 06:01:48  58.4N   32.0W Mw=5.0  EMSC   REYKJANES RIDGE              

O: 14AUG2018 05:07:50  58.4N   32.0W mb=4.8  EMSC   REYKJANES RIDGE              

P: 16AUG2018 119024    59.0N   30.0W 4.0-5.6 AAAAA  North Mid-Atlantic Ridge   

 

O: 11AUG2018 12:15:36  55.1S  146.4E mb=5.4  EMSC   WEST OF MACQUARIE ISLAND     

 

Moderate earthquakes also hit the region near Tokyo, Japan (M 5.2) and the Ryukyu Islands of Japan (M 5.0) today. These are probably being promoted by regional tropical storms and typhoons. The event near Tokyo followed an approach at Tokyo by Typhoon Shanshan as noted in previous issues of this summary:

 

"As TS Shanshan moves north it may encounter the Kuril Islands around August 9-10 but this is unlikely since it is expected veer to the east after reaching Tokyo. A moderate to strong induced earthquake in the region of Tokyo is possible as Shanshan passes by the area." (August 5-6, 2018)

 

The last earthquake of M 5.2 in the region of Tokyo within about 100 km of this epicenter was an M M 5.9 a month ago on July 7, 2018 and this may by the strongest aftershock of that event to date.   Forecast 118949 had expected today's earthquake within about 25 km of the epicenter was likely

August 14.

 

NEIC reported this earthquake of M 5.2 near Tokyo, Japan  was felt with intensity V in Ohara, Chiba, Japan and II-III in the area(s) of Chiba at Narita, Narashino, Urayasu, in Kanagawa at Kawasaki, Yokohama, Kamakura; in Tokyo at Tokyo, Komae, and Akishima; in Saitama at Kawaguchi and Saitama and in Ibaraki at Naka,  and Soka.

 

O: 14AUG2018 03:35:48  35.2N  140.7E mb=5.2  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 14AUG2018 118949    35.0N  141.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

The event of M 5.0 in the Ryukyu Islands had also been expected at this time as noted in previous issues of this summary:

 

"TS Yagi (TD 18W) continued today southeast of Honshu, Japan with winds up to 45 kts. It is expected to track to the north reaching the Ryukyu Islands August 11-12. Some seismicity in the Ryukyu Islands may be enhanced with this storm." (August 11-13, 2018)

 

Forecast 118915 had expected this event was likely within about 50 km around August 12.

 

O: 13AUG2018 16:19:17  25.8N  125.2E mb=5.0  EMSC   SOUTHWESTERN RYUKYU ISL., JAPA

P: 12AUG2018 118915    26.0N  126.0E 4.0-5.8 AAAAA  Ryukyu Islands             

 

STRONG EARTHQUAKES HIT NORTHERN ALASKA

 

EARTHQUAKE SUMMARY FOR AUGUST 12, 2018

 

A strong earthquake of M 6.4 hit the region of northern Alaska near the north slope and was followed by an M 6.0 and numerous light and moderate aftershocks.

The mainshock of M 6.4 was reported felt with intensity IV in Kaktovik, Alaska and II-III within about 1000 km of the epicenter in Anchorage, Eagle Rive, Fairbanks, Nuiqsut and Prudhoe Bay, Alaska. The M 6.0 was reported felt with intensity V in Kaktovik, Alaska and II-III in Prudhoe Bay, Bettles Field, and possibly in North Pole and Anchorage, Alaska. As the M 6.0 aftershock occurred within minutes of local solar noon, it is likely promoted by tidal stresses. Other moderate aftershocks were felt lightly in Kaktovik, Alaska. This activity was probably promoted by the new moon which arrived yesterday. Maximum tidal stresses were expected at this time near the Alaskan epicenters at this time in the tidal forecast:

 

"The new moon will arrive at 09:58 UT on August 11, 2018. Longitudes which are sub-solar at this time center near 30 East and 150 West. These include eastern Europe and the African Rift valley in the east and Central Alaska and Hawaii in the west. While these zones are most likely to see tidal triggering as the stresses are highest, tidal promotion in the next week can occur in areas outside these longitude zones. Earthquakes most likely to see tidal stress components should occur new local solar noon and midnight when these stresses are maximized." (August 9-12, 2018)

 

A second triggering stress which probably helped initiate and sustain this

series in Northern Alaska was probably energy from the New Guinea quake of February 25 which is at the fourth node (90 degrees); Hawaii at the seventh node (51 degrees) and the M 7.0 earthquake in  Lombok, Indonesia which is located at 101-102 degrees from the Alaskan epicenters. This summary has emphasized this triggering in previous issues as:

 

"The largest earthquake in the world today was an M 5.4-5.8 quake in the Greenland Sea east of Norway. It was followed by an M 4.6 aftershock. ...  This earthquake is located at 103 degrees from the M 7.0 in Lombok, Indonesia. Energy from large earthquakes reflects and refracts off internal earth boundaries and is redirected to this distance on  the surface. Strong seismic enhancement often follows in this distance zone suggesting triggering at a distance." (August 8, 2018)

 

"The M 5.6 in the South Atlantic Ocean, the largest in the area in recent history was located at 104 degrees from the M 7.0 in Lombok, Indonesia. Seismic energy is refracted and reflected off core-mantle boundaries to the surface and arrives in this distance zone. Strongly enhanced seismicity at this distance often follows and is likely promoted by this energy. An earthquake in the Greenland Sea of M 4.5 also occurred at 103 degree from Lombok today." (August 10, 2018)

 

 

"The strongly enhanced seismicity at high northern latitudes over the past five days has not hit Alaska yet. It is likely that a moderate to strong quake will occur in central or northern Alaska in the next week. Like the recent earthquakes in the Greenland Sea and Arctic Oceans, this area is also near 103 degrees from the M 7.0 in Lombok last week. There has been much enhancement at this distance from Lombok since that event occurred and this is likely to continue.

 

An unusual earthquake of M 3.3 hit northern Alaska today at 100-101 degrees from Lombok. The last earthquake of M>=3.3 within about 150 km of this epicenter in Northern Alaska occurred on August 5, 2018 (M 3.3) and January 1, 2081 (also M 3.3. The last of larger magnitude in this area was an M 3.7 on January 24, 2017." (August 12, 2018)

 

The current series is located near the area where oil is being extracted from the north slope in Alaska. It is likely that this extraction also helped promote today's earthquakes. Seismicity often is enhanced in oil fields as fluids are removed from the sub-surface and motion is thus encouraged. Seismicity in oil extraction areas is often triggered near times of high tidal stress such as new and full moons.

 

The earthquakes of M 6.0 and 6.4 today are the first of M>=6 within about 400 km of these epicenter in at least 30 years. The last such event of M>=5 occurred November 7, 2010 and prior to that as events of M 5.0 on February 20, 2006; December 4, 2001 and August 31, 1995. When this earthquake occurred this summary noted:

 

Forecast 119049 had expected this activity was likely in mid-August.

 

"The largest earthquake in the world today occurred in northern Alaska with M 5.3. It was felt with intensity III in Barrow and II in Prudhoe Bay and Nuiqsut, Alaska. The only earthquake of comparable size in the region in the past 20 years occurred about 150 km to the southwest as an M 5.5 on August 21, 2003. This is an area of oil extraction and the quake may be related to oil extraction in the Prudhoe Bay region of Northern Alaska.  The M 5.3 in  northern Alaska may have been triggered by the Sumatra earthquake as well as it lies at the inner edge of the seismic shadow zone from that event (101 degrees). Seismicity is often found to increase at the edges of the shadow zone after strong earthquakes such as that in Sumatra. Seismic energy is reflected and refracted off  inner boundaries - the core-mantle boundary - of the earthquake and returned to the surface in this distance range (101-105 degrees) and apparently can trigger or enhance seismicity in this range." (November 7, 2010)

 

Also, like today's event the Alaska quake of 2010 was preceded by a day by a moderate quake in Albania within about 25 km of yesterday's event of M 5.1 as noted in this summary at the time:

 

 

"An earthquake of M 4.0-4.4 in Albania today continued the series of three moderate earthquakes in this general region of southern Europe. In the past three days there have been events of M 4.5-5.5 in the Tyhrennian Sea, Serbia and Turkey." (November 7, 2010)

 

 

Forecast 119049 had expected today's activity was likely in mid-August.

 

 

O: 13AUG2018 00:53:49  69.4N  144.1W ML=3.0  EMSC   NORTHERN ALASKA               

O: 12AUG2018 23:29:38  69.4N  144.1W ML=4.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 02:26:15  69.4N  144.1W Ml=3.0  EMSC   NORTHERN ALASKA

O: 13AUG2018 06:16:43  69.4N  144.1W Ml=3.2  EMSC   NORTHERN ALASKA

O: 12AUG2018 21:47:41  69.4N  144.2W mb=4.6  EMSC   NORTHERN ALASKA

O: 13AUG2018 00:45:26  69.4N  144.4W ML=3.0  EMSC   NORTHERN ALASKA

O: 13AUG2018 01:28:20  69.5N  144.0W ML=3.0  EMSC   NORTHERN ALASKA

O: 12AUG2018 22:00:18  69.5N  144.0W mb=4.5  EMSC   NORTHERN ALASKA

O: 12AUG2018 23:41:30  69.5N  144.1W ML=3.2  EMSC   NORTHERN ALASKA

O: 12AUG2018 21:38:04  69.5N  144.1W ML=4.5  EMSC   NORTHERN ALASKA

O: 13AUG2018 01:06:55  69.5N  144.1W Ml=3.1  EMSC   NORTHERN ALASKA

O: 12AUG2018 23:36:51  69.5N  144.1W Ml=3.2  EMSC   NORTHERN ALASKA

O: 13AUG2018 00:14:41  69.5N  144.2W ML=3.4  EMSC   NORTHERN ALASKA

O: 12AUG2018 21:25:48  69.5N  144.2W ML=4.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 04:33:37  69.5N  144.2W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 04:10:40  69.5N  144.2W Ml=3.6  EMSC   NORTHERN ALASKA

O: 13AUG2018 03:12:19  69.5N  144.4W Ml=3.0  EMSC   NORTHERN ALASKA

O: 13AUG2018 03:40:00  69.5N  144.4W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 04:28:22  69.5N  144.6W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 06:55:54  69.5N  144.7W ML=3.6  EMSC   NORTHERN ALASKA

O: 12AUG2018 16:22:06  69.5N  144.7W ML=3.7  EMSC   NORTHERN ALASKA

O: 13AUG2018 00:19:12  69.5N  144.7W Ml=3.3  EMSC   NORTHERN ALASKA

O: 13AUG2018 02:01:47  69.5N  144.7W Ml=3.4  EMSC   NORTHERN ALASKA

O: 13AUG2018 04:43:09  69.5N  144.7W Ml=4.0  EMSC   NORTHERN ALASKA

O: 12AUG2018 15:18:38  69.5N  144.7W mb=4.8  EMSC   NORTHERN ALASKA

O: 13AUG2018 01:44:02  69.6N  143.5W Ml=3.2  EMSC   NORTHERN ALASKA

O: 13AUG2018 00:10:39  69.6N  144.1W ML=3.5  EMSC   NORTHERN ALASKA

O: 12AUG2018 22:09:03  69.6N  144.1W ML=3.9  EMSC   NORTHERN ALASKA

O: 12AUG2018 21:54:41  69.6N  144.1W Ml=3.1  EMSC   NORTHERN ALASKA

O: 12AUG2018 22:56:58  69.6N  144.1W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 03:20:14  69.6N  144.1W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 05:37:37  69.6N  144.1W Ml=3.2  EMSC   NORTHERN ALASKA

O: 13AUG2018 01:09:47  69.6N  144.1W Ml=3.3  EMSC   NORTHERN ALASKA

O: 13AUG2018 01:37:34  69.6N  144.1W Ml=3.3  EMSC   NORTHERN ALASKA

O: 13AUG2018 06:58:24  69.6N  144.1W Ml=3.7  EMSC   NORTHERN ALASKA

O: 13AUG2018 00:39:01  69.6N  144.2W ML=3.6  EMSC   NORTHERN ALASKA

O: 12AUG2018 20:55:40  69.6N  144.2W ML=3.9  EMSC   NORTHERN ALASKA

O: 12AUG2018 20:56:45  69.6N  144.2W ML=4.1  EMSC   NORTHERN ALASKA

O: 12AUG2018 21:27:23  69.6N  144.2W ML=4.4  EMSC   NORTHERN ALASKA

O: 12AUG2018 23:59:49  69.6N  144.2W ML=4.4  EMSC   NORTHERN ALASKA

O: 13AUG2018 01:05:16  69.6N  144.2W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 07:12:39  69.6N  144.2W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 08:04:25  69.6N  144.2W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 04:37:34  69.6N  144.2W Ml=3.3  EMSC   NORTHERN ALASKA

O: 12AUG2018 21:00:44  69.6N  144.2W Ml=3.4  EMSC   NORTHERN ALASKA

O: 12AUG2018 23:35:03  69.6N  144.2W Ml=3.7  EMSC   NORTHERN ALASKA

O: 13AUG2018 05:22:34  69.6N  144.2W Ml=4.0  EMSC   NORTHERN ALASKA

O: 13AUG2018 06:37:28  69.6N  144.2W Ml=4.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 05:41:48  69.6N  144.2W mb=4.1  EMSC   NORTHERN ALASKA

O: 12AUG2018 23:02:27  69.6N  144.3W ML=3.5  EMSC   NORTHERN ALASKA

O: 12AUG2018 21:24:11  69.6N  144.3W ML=4.1  EMSC   NORTHERN ALASKA

O: 12AUG2018 15:42:24  69.6N  144.3W ML=4.2  EMSC   NORTHERN ALASKA

O: 12AUG2018 21:05:03  69.6N  144.3W Ml=3.0  EMSC   NORTHERN ALASKA

O: 12AUG2018 20:05:06  69.6N  144.3W Ml=3.3  EMSC   NORTHERN ALASKA

O: 13AUG2018 02:58:20  69.6N  144.3W Ml=3.3  EMSC   NORTHERN ALASKA

O: 13AUG2018 05:06:25  69.6N  144.3W Ml=3.3  EMSC   NORTHERN ALASKA

O: 13AUG2018 01:02:36  69.6N  144.3W Ml=3.5  EMSC   NORTHERN ALASKA

O: 13AUG2018 08:53:12  69.6N  144.3W Ml=4.4  EMSC   NORTHERN ALASKA

O: 13AUG2018 05:43:57  69.6N  144.3W mb=4.3  EMSC   NORTHERN ALASKA

O: 13AUG2018 01:21:21  69.6N  144.4W ML=2.9  EMSC   NORTHERN ALASKA

O: 12AUG2018 21:15:02  69.6N  144.4W Mw=6.0  EMSC   NORTHERN ALASKA

O: 12AUG2018 16:44:40  69.6N  144.5W ML=4.2  EMSC   NORTHERN ALASKA

O: 12AUG2018 18:52:49  69.6N  144.6W Ml=3.0  EMSC   NORTHERN ALASKA

O: 13AUG2018 01:57:47  69.6N  144.6W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 02:42:34  69.6N  144.6W Ml=3.9  EMSC   NORTHERN ALASKA

O: 12AUG2018 21:31:06  69.6N  144.6W Mw=5.0  EMSC   NORTHERN ALASKA

O: 13AUG2018 05:00:21  69.6N  144.6W mb=4.6  EMSC   NORTHERN ALASKA

O: 12AUG2018 15:39:33  69.6N  144.7W ML=3.8  EMSC   NORTHERN ALASKA

O: 12AUG2018 16:11:32  69.6N  144.7W ML=3.8  EMSC   NORTHERN ALASKA

O: 12AUG2018 19:44:15  69.6N  144.7W Ml=3.2  EMSC   NORTHERN ALASKA

O: 13AUG2018 05:19:45  69.6N  144.7W Ml=3.7  EMSC   NORTHERN ALASKA

O: 12AUG2018 19:38:28  69.6N  144.7W mb=4.3  EMSC   NORTHERN ALASKA

O: 12AUG2018 15:34:49  69.6N  144.7W mb=4.7  EMSC   NORTHERN ALASKA

O: 12AUG2018 17:54:25  69.6N  144.8W ML=3.9  EMSC   NORTHERN ALASKA

O: 13AUG2018 07:46:55  69.6N  144.8W Ml=3.1  EMSC   NORTHERN ALASKA

O: 12AUG2018 20:51:01  69.6N  144.8W Ml=3.3  EMSC   NORTHERN ALASKA

O: 12AUG2018 18:36:44  69.6N  144.8W mb=4.8  EMSC   NORTHERN ALASKA

O: 12AUG2018 18:36:44  69.6N  144.8W mb=4.8  EMSC   NORTHERN ALASKA

O: 12AUG2018 15:14:21  69.6N  144.8W mb=4.9  EMSC   NORTHERN ALASKA

O: 12AUG2018 16:39:29  69.6N  144.9W ML=3.7  EMSC   NORTHERN ALASKA

O: 13AUG2018 07:29:17  69.6N  144.9W Ml=3.0  EMSC   NORTHERN ALASKA

O: 12AUG2018 15:28:56  69.6N  144.9W Ml=3.4  EMSC   NORTHERN ALASKA

O: 12AUG2018 16:02:09  69.6N  145.0W mb=5.3  EMSC   NORTHERN ALASKA

O: 13AUG2018 00:28:24  69.6N  145.2W Ml=3.1  EMSC   NORTHERN ALASKA

O: 12AUG2018 18:54:04  69.6N  145.2W Ml=3.3  EMSC   NORTHERN ALASKA

O: 12AUG2018 16:53:12  69.6N  145.2W mb=4.0  EMSC   NORTHERN ALASKA

O: 12AUG2018 14:58:54  69.6N  145.3W Mw=6.4  EMSC   NORTHERN ALASKA

O: 12AUG2018 23:22:22  69.7N  144.2W ML=3.0  EMSC   NORTHERN ALASKA

O: 13AUG2018 00:35:18  69.7N  144.2W ML=3.0  EMSC   NORTHERN ALASKA

O: 13AUG2018 03:37:55  69.7N  144.2W Ml=3.0  EMSC   NORTHERN ALASKA

O: 12AUG2018 22:59:49  69.7N  144.2W Ml=3.2  EMSC   NORTHERN ALASKA

O: 13AUG2018 07:50:12  69.7N  144.2W Ml=3.4  EMSC   NORTHERN ALASKA

O: 13AUG2018 02:17:06  69.7N  144.2W Ml=3.6  EMSC   NORTHERN ALASKA

O: 13AUG2018 03:13:53  69.7N  144.2W Ml=3.6  EMSC   NORTHERN ALASKA

O: 12AUG2018 15:55:47  69.7N  144.2W Ml=3.7  EMSC   NORTHERN ALASKA

O: 12AUG2018 16:15:52  69.7N  144.2W Ml=3.7  EMSC   NORTHERN ALASKA

O: 12AUG2018 21:44:17  69.7N  144.3W ML=4.0  EMSC   NORTHERN ALASKA

O: 13AUG2018 08:41:24  69.7N  144.3W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 04:46:33  69.7N  144.3W Ml=3.6  EMSC   NORTHERN ALASKA

O: 12AUG2018 15:33:38  69.7N  144.3W Ml=3.7  EMSC   NORTHERN ALASKA

O: 13AUG2018 00:18:03  69.7N  144.5W ML=3.0  EMSC   NORTHERN ALASKA

O: 12AUG2018 16:19:55  69.7N  144.6W Ml=3.0  EMSC   NORTHERN ALASKA

O: 12AUG2018 17:30:46  69.7N  144.8W ML=4.1  EMSC   NORTHERN ALASKA

O: 12AUG2018 20:21:35  69.7N  144.8W Ml=3.0  EMSC   NORTHERN ALASKA

O: 12AUG2018 16:00:23  69.7N  144.8W Ml=3.1  EMSC   NORTHERN ALASKA

O: 13AUG2018 04:00:26  69.7N  144.9W Ml=3.0  EMSC   NORTHERN ALASKA

O: 12AUG2018 21:36:34  69.7N  144.9W Ml=3.6  EMSC   NORTHERN ALASKA

O: 13AUG2018 06:25:37  69.7N  145.0W Ml=3.2  EMSC   NORTHERN ALASKA

O: 13AUG2018 01:13:11  69.7N  145.0W Ml=3.6  EMSC   NORTHERN ALASKA

O: 12AUG2018 15:27:45  69.8N  144.3W Ml=3.4  EMSC   NORTHERN ALASKA

O: 13AUG2018 02:12:43  69.8N  145.3W ML=3.8  EMSC   NORTHERN ALASKA

O: 13AUG2018 08:53:12  69.6N  144.3W Ml=4.4  EMSC   NORTHERN ALASKA              

P: 13AUG2018 119049    71.0N  134.0W 2.5-3.9 ABBAA  Yukon Territory, Canada    

 

An earthquake of M 4.7 occurred in Guerrero, Mexico today. This is the strongest quake in this area of Guerrero in nearly a year - since an M 5.1 on August 18, 2017. Prior to that, events of M 4.8 hit the region on February 2, 2017 and August 4, 2014. Forecast 118890 had expected this activity was likely within about 50 km of this epicenter around August 14. This epicenter is located at 144 degrees from the Lombok, Indonesia M 7.0 of August 5, a distance at which seismic promotion is likely after strong earthquakes.

Like the quakes in Alaska, this epicenter is also at the seventh node (51 degrees) from Hawaii. NEIC reported this earthquake of M 4.6-4.7 in Guerrero, Mexico was felt with intensity II-III in the area(s) of Xico, Naucalpan, Mexico City and Queretaro, Mexico.

 

O: 12AUG2018 05:13:06  16.5N  100.6W ML=4.3  EMSC   OFFSHORE GUERRERO, MEXICO    

O: 12AUG2018 14:42:11  17.2N  100.6W mb=4.7  EMSC   GUERRERO, MEXICO             

P: 14AUG2018 118890    17.0N  101.0W 3.5-5.1 AAAAA  Michoacan, Mexico          

 

STRONG SEISMICITY CONTINUES NEAR 103 DEGREES FROM LOMBOK, INDONESIA

 

EARTHQUAKE SUMMARY FOR AUGUST 11, 2018

 

A moderate earthquake of M 5.1 shook the region of Albania today. NEIC reported intensity V in Albania at Shkoder, Librazhd, IV in Tirana, Lukovo, Elbasan, and in Macedonia at Tetovo. Lesser shaking of II-III was felt in Macedonia at Ohrid, Skopje, in Serbia and Montenegro at Niksic,Pristina, Kosovo Polje, Podgorica, Prizen, Djakovica, Orahovac, Ulcinj, in Macedonia at Ohrid, and in Albania at Pogradec, Bajram Cvaje, Durres, Shengjin, Mamurras, Rreshen and Peshkopi, Albania. This epicenter is located at 100-101 degrees from the M 7.0 in Lombok, Indonesia. Seismic energy is concentrated at the surface at this distance from strong earthquakes due to reflection and refraction off core-mantle boundaries, and like much of recent moderate to strong quakes in the northern oceans was probably promoted from that source. This possibility had previously been noted in this summary as:

 

"The M 5.6 in the South Atlantic Ocean, the largest in the area in recent history was located at 104 degrees from the M 7.0 in Lombok, Indonesia. Seismic energy is refracted and reflected off core-mantle boundaries to the surface and arrives in this distance zone. Strongly enhanced seismicity at this distance often follows and is likely promoted by this energy. An earthquake in the Greenland Sea of M 4.5 also occurred at 103 degree from Lombok today." (August 10, 2018)

 

and

 

"The largest earthquake in the world today was an M 5.4-5.8 quake in the Greenland Sea east of Norway. It was followed by an M 4.6 aftershock.  ... This earthquake is located at 103 degrees from the M 7.0 in Lombok, Indonesia. Energy from large earthquakes reflects and refracts off internal earth boundaries and is redirected to this distance on  the surface. Strong seismic enhancement often follows in this distance zone suggesting triggering at a distance." (August 7-8, 2018)

 

The last earthquake in Albania of M>=5.1 within about 200 km of this epicenter occurred on September 11, 2016 (M 5.3) and prior to that on May 19, 2014 (M 5.1). Forecast 119006 had expected this earthquake was likely within about 50 km of the epicenter around August 14.

 

O: 11AUG2018 15:38:34  41.6N   20.1E mb=5.1  EMSC   ALBANIA                       

P: 14AUG2018 119006    42.0N   20.0E 3.0-5.0 BAAAA  Romania/NW Turkey          

 

The strongly enhanced seismicity at high northern latitudes over the past five days has not hit Alaska yet. It is likely that a moderate to strong quake will occur in central or northern Alaska in the next week. Like the recent earthquakes in the Greenland Sea and Arctic Oceans, this area is also near 103 degrees from the M 7.0 in Lombok last week. There has been much enhancement at this distance from Lombok since that event occurred and this is likely to continue.

 

An unusual earthquake of M 3.3 hit northern Alaska today at 100-101 degrees from Lombok. The last earthquake of M>=3.3 within about 150 km of this epicenter in Northern Alaska occurred on August 5, 2018 (M 3.3) and January 1, 2081 (also M 3.3. The last of larger magnitude in this area was an M 3.7 on January 24, 2017.

 

O: 12AUG2018 05:04:16  68.6N  147.3W ML=3.3  EMSC   NORTHERN ALASKA              

 

The strongest earthquake in the world today was an M 5.4 in the area west of Macquarie Island, south of Australia. This continue strong activation of this region which included an M 5.6 in the Balleny Islands area yesterday.

 

O: 11AUG2018 12:15:36  55.1S  146.4E mb=5.4  EMSC   WEST OF MACQUARIE ISLAND     

 

An M 4.5 in the region of northern Iceland occurred today. It was not reported felt and may be related to renewed volcanism in the area. The epicenter is near the antipode of the Balleny event yesterday as noted in the previous issue of this report:

 

"The epicenter in the Balleny Islands is at the antipode of the M 3.5 in Iceland and may have helped promote additional activity in Iceland. This activity is expected to continue on an enhanced magnitude level in Iceland over the next several days. (August 11, 2018)"

 

The last earthquake within about 200 km of this epicenter in Iceland with M>=4.5 occurred February 19, 2018 with M 5.0 and prior to that as an M 5.2 on March 26, 2017. Forecast 118786 had expected this area of Iceland would see a moderate quake around August 10.

 

O: 11AUG2018 13:15:43  68.1N   18.3W mb=4.5  EMSC   ICELAND REGION               

P: 10AUG2018 118786    65.0N   17.0W 3.0-4.4 ACAAA  Iceland area               

P: 13AUG2018 119048    71.0N   14.0W 3.5-4.9 ACAAA  Jan Mayen Isl. area         

 

An earthquake of M 5.3 also hit the southern Mid-Atlantic ridge today continuing strong seismic activation in that region. It was not reported felt in this remote oceanic region. The last earthquake of M>=5.3 within about 200 km  of this epicenter occurred on November 11, 2017 with M 6.1-6.3. Forecast 119059 expected this event within about 150 km was likely around August 14. This epicenter is at 142 degrees from Hawaii, a distance at which seismic enhancement is expected after strong activity.

 

O: 12AUG2018 02:56:58  12.9S   14.7W mb=5.3  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

P: 14AUG2018 119059    14.0S   14.0W 4.0-5.6 ABAAA  So. Mid-Atlantic Ridge     

 

EARTHQUAKE OF M 6.1 STRIKES KURIL ISLANDS

 

EARTHQUAKE SUMMARY FOR AUGUST 10, 2018

 

The strongest earthquakes in the world today occurred at high latitudes. In addition to a series in the Arctic Ocean, the largest of the day was an M 6.1 in the northern Kuril Islands, north of Japan. This occurred as the remnants of Typhoon Shanshan were passing near this epicenter as noted in the previous issue of this summary:

 

 

"A series of earthquakes also occurred in the southern Kuril Islands as Shanshan passed that area today. They were not felt in this region. Among these was an M 5.1, the strongest outside Lombok aftershock area today in the world and had been expected in previous issues of this summary as:

 

"As TS Shanshan moves north it may encounter the Kuril Islands around August 9-10 but this is unlikely since it is expected veer to the east after reaching Tokyo. A moderate to strong induced earthquake in the region of Tokyo is possible as Shanshan passes by the area." (August 5-6, 2018)

 

The last earthquake within about 200 km of this epicenter in the Kuril Islands was an M 6.1 on April 19, 2013 and prior to that an M 6.5 on July 20, 2012. Forecast 118729 expected this activity within about 50 km was likely in early August.

 

O: 10AUG2018 18:45:59  48.4N  155.9E mb=4.1  EMSC   KURIL ISLANDS                

O: 10AUG2018 18:12:04  48.5N  154.9E mb=6.1  EMSC   KURIL ISLANDS                

P:  5AUG2018 118729    49.0N  156.0E 3.5-5.4 BAAAA  NE Pacific                 

 

A series of moderate earthquake occurred today at high latitudes. These included

events in the Franz Josef Land (M 4.3); the Greenland Sea (M 4.4); Jan Mayen Island (M 5.3) and Iceland (M 3.5) in the north and an M 5.5 in the Balleny Islands in the South. The epicenter in the Balleny Islands is at the antipode of the M 3.5 in Iceland and may have helped promote additional activity in Iceland. This activity is expected to  continue on an enhanced magnitude level in Iceland over the next several days. Two earthquakes of M>=5.5 have occurred in the Balleny Islands over the past year - both about 500 km west of today's epicenter - with M 5.8 on July 16, 2018 and M 6.2 on October 8, 2017. Many of these (Greenland Sea, Jan Mayen) were preceded by moderate events over the past several days. Many of these and today's events occurred near 103 degrees from Lombok, Indonesia and energy from that source may be fueling this activity.

 

O: 10AUG2018 18:09:23  62.7S  165.5E Mw=5.5  EMSC   BALLENY ISLANDS REGION       

 

O: 11AUG2018 05:56:30  66.1N   15.0W ML=3.5  EMSC   ICELAND REGION               

P: 10AUG2018 118786    65.0N   17.0W 3.0-4.4 ABAAA  Iceland area               

 

O: 11AUG2018 05:54:48  71.8N    2.1W Mw=5.3  EMSC   JAN MAYEN ISLAND REGION      

 

O: 11AUG2018 01:33:05  79.1N    3.3E mb=4.4  EMSC   GREENLAND SEA                

P: 19AUG2018 119048    74.0N    8.0E 3.0-4.6 CCAAA  Norway                     

 

O: 11AUG2018 00:01:46  86.2N   36.5E mb=4.3  EMSC   NORTH OF FRANZ JOSEF LAND    

 

The strongest earthquake in the U.S. or Canada today was also at high latitudes.

This earthquake of M 4.7 in the Andreanof Islands, Aleutians, Alaska was not reported felt in this remote area. The last event of M>=4.7 within about 200 km of today's epicenter occurred May 25, 2018 with M 4.9. The last to occur south of 50N latitude was an M 4.9 on August 18, 2013.  Forecast 118757 had expected today's event was likely around August 9 within about 100 km of this epicenter. The epicenter is south of the normal activity in the area and may be an outer-bank earthquake suggesting a larger upcoming event at this longitude in the Andreanof Islands, Alaska. The last earthquake of M>=4.7 within 100 km of today's epicenter was an M 4.7 on May 11, 2014.

 

O: 10AUG2018 11:26:38  50.0N  178.3W mb=4.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O: 10AUG2018 11:26:38  49.9N  178.3W mb=4.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  9AUG2018 118757    50.9N  179.0W 3.5-5.2 AAAAA  Andreanoff Isls, Aleutians 

 

The strongest earthquake in the U.S. or Canada outside Alaska today was an M 3.9 in the Baffin Bay area of eastern Canada. It was not reported felt in this remote area. Earthquakes in the area within about 200 km of this epicenter are not uncommon. The last with M>=3.9 was an M 4.5 on August 26, 2016. Forecast 119047 expected today's event within about 50 km of this epicenter in mid-August.

 

O:  9AUG2018 06:58:50  73.4N   72.1W ML=3.9  NRCA  209 km NE from Pond Inlet     

P: 16AUG2018 119047    73.3N   73.5W 2.5-3.9 CAAAA  Baffin/Davis Strait Canada 

 

An unusual earthquake of M 3.7 in western Montana today followed a foreshock of M 2.4. NEIC reported this earthquake of M 3.7 in Western Montana was felt with intensity II-III in the area(s) of Drummond, Missoula and Florence, Montana.

The last event in western Montana west of 113W longitude with M>=3.7 was an M 3.8 on November 11, 2011. Forecast 118726 expected activity in this region around August 10.

 

O: 10AUG2018 14:21:23  46.7N  113.1W ML=2.4  EMSC   WESTERN MONTANA              

O: 11AUG2018 06:04:16  46.7N  113.5W ML=3.7  EMSC   WESTERN MONTANA              

P: 10AUG2018 118726    44.9N  113.4W 2.0-4.3 ABAAA  Montana/Idaho              

 

MODERATELY STRONG QUAKES SHAKE OCEAN FLOOR

 

EARTHQUAKE SUMMARY FOR AUGUST 9, 2018

 

Several areas of the world's oceans saw moderate to moderately large quakes today. An M 5.6 in the South Atlantic region was joined by two events of M 5.2 each in the Southern Mid-Atlantic Ridge. The M 5.6 in the South Atlantic is the  largest earthquake within about 500 km of that epicenter since at least 1990.

The pair of M 5.2's on the Southern Mid-Atlantic Ridge were the strongest within about 200 km of that epicenter since an M 6.1-6.3 on November 11, 2017 and prior to that on May 2, 2017 (M 5.9). Forecast 118802 had expected today's activity in the southern Mid-Atlantic Ridge was likely in early August. The earthquakes in the Mid-Atlantic occurred at  142 degrees from Hawaii, a distance at which seismic energy is concentrated at the surface and may help promote zonal activity.

 

O: 10AUG2018 07:17:04  12.9S   14.6W mb=5.2  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

O: 10AUG2018 07:18:31  12.9S   14.6W mb=5.2  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

P:  4AUG2018 118802    13.0S   15.0W 4.0-5.4 CAAAA  So. Mid-Atlantic Ridge     

 

The M 5.6 in the South Atlantic Ocean, the largest in the area in recent history was located at 104 degrees from the M 7.0 in Lombok, Indonesia. Seismic energy is refracted and reflected off core-mantle boundaries to the surface and arrives in this distance zone. Strongly enhanced seismicity at this distance often follows and is likely promoted by this energy. An earthquake in the Greenland Sea of M 4.5 also occurred at 103 degree from Lombok today.

 

O:  9AUG2018 16:53:39  33.5S    2.5E Mw=5.6  EMSC   SOUTH ATLANTIC OCEAN         

 

An earthquake of M 5.6 was felt widely in Guatemala today. NEIC reported it was felt with intensity II-III in Palin, Escuintla; in Sacatepequez at Ciudad Vieja and Antigua Guatemala; Panajachel, Solola, in the Guatemala City area at Guatemala City, Mixco and Santa Catarina Pinula; in Chisec, Alta Verapaz and in La Libertad, El Salvador at Nueva San Salvador, Nuevo Cuscatlan, Quezaltepeque, Antiguo Cuscatlan; and in San Salvador area at Mejicanos, Soyapango. The last earthquake within about 100 km of this epicenter near Guatemala occurred as an M 5.7 on June 18, 2018 and prior to that an M 6.8 on June 22, 2017. Forecast 118613 had expected today's epicenter would likely be active around August 9.

 

O:  9AUG2018 19:21:49  13.6N   91.2W mb=5.2  EMSC   OFFSHORE GUATEMALA           

O: 09AUG2018 19:21:53  13.6N   91.2W mw=5.6  ANSS   Puerto San Jose Guatemala

P:  9AUG2018 118613    15.0N   91.0W 3.5-5.3 ABAAA  Guatemala                  

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 in the Leilani Estates of Hawaii. This is not part of the now-quiet eruption of Kilauea which did not see any earthquakes of M>=3 for the fifth straight day. It is located in the area which was active in late April, 2018 prior to the M 6.9 and eruption of Kilauea on  May 4. It was widely felt in Hawaii. NEIC reported maximum intensity IV at Volcano and Lahaina, Hawaii and II-III in Waikoloa, Kailua Kona, Kamuela, Honokaa, Captain Cook, Naalehu, Ookala, Laupahoehoe, Papaaloa, Hakalau, Honomu, Pahala, Pepeekeo, Papaikou, Hilo, Keaau, Kurtistown, Mountain View and Pahoa, Hawaii. The last earthquake in the Leilani Estates of M>=4.6 occurred June 20, 2018 with M 4.6. Forecast 118634 expected today's event was likely around August 11.

 

O:  9AUG2018 16:50:32  19.4N  155.0W mb=4.4  EMSC   ISLAND OF HAWAII, HAWAII     

O: 09AUG2018 16:50:32  19.4N  155.0W ml=4.4  ANSS   Leilani Estates Hawaii

P: 11AUG2018 118634    20.4N  155.1W 4.0-5.6 AAAAA  Hawaii area                

 

An unusually large earthquake occurred in the Mammoth Lakes region of California today with M 3.0. It was associated with several light shocks. While this region is generally active at low magnitudes, the last event of M>=3 in the area was an M 3.6 on April 22, 2018. This was at the time of the Leilani Estates swarm in Hawaii in late April. There may be no relation between these two events but the coincidence is worth noting. Forecast 118650 had expected today's event was likely around August 10.

 

NEIC reported this earthquake of M 3.0 in Mammoth Lakes, California was felt with intensity II-III in the area(s) of Mammoth Lakes, California.

 

O:  9AUG2018 16:14:01  37.7N  118.9W MD=2.2  EMSC   LONG VALLEY AREA, CALIFORNIA 

O:  9AUG2018 17:26:22  37.7N  118.9W MD=2.2  EMSC   LONG VALLEY AREA, CALIFORNIA 

O:  9AUG2018 18:14:36  37.7N  118.9W MD=2.3  EMSC   LONG VALLEY AREA, CALIFORNIA 

O:  9AUG2018 17:22:36  37.7N  118.9W MD=3.0  EMSC   LONG VALLEY AREA, CALIFORNIA 

P: 10AUG2018 118650    37.4N  118.6W 2.5-4.6 AAAAA  California/Nevada area     

 

STRONG AFTERSHOCK SHAKES NORTHERN LOMBOK, INDONESIA

 

EARTHQUAKE SUMMARY FOR AUGUST 8, 2018

 

A strong aftershock of M 5.9-6.2 hit the region of Lombok, Indonesia today. NEIC reported it was felt with intensity V in Mataram; IV in Karangasem, Ubud, Kuta, Denpasar, and Singaraja, Bali and II-III in Kedungwaru, Java and in Bali at Tabanan, Klungkung and Praya. BMG reported it was felt with intensity VI in Lombok; V in Matatam; Klungkung IV in Denpasat III in Sumbawa and II-III in Tabanan, Indonesia. More than 319 have been confirmed dead by the Indonesian government with the series of large earthquakes in this region in the past 10 days. Forecast 118595 had expected this series to peak with the M 7.0 around August 5 within about 50 km of this epicenter.

 

 

O:  8AUG2018 11:30:03   7.8S  116.8E ML=3.9  EMSC   BALI SEA                     

O:  9AUG2018 05:25:31   8.4S  116.2E Mw=5.9  EMSC   LOMBOK REGION, INDONESIA     

O: 09AUG2018 05:25:32  08.4S  116.2E MS=6.2  BMG  Felt with intensity VI

O:  9AUG2018 05:25:31   8.4S  116.2E Mw=6.0  ANSS   LOMBOK REGION, INDONESIA     

P:  5AUG2018 118595     9.0S  116.0E 4.0-5.6 BAAAA  So. of Bali                

 

An earthquake of M 4.7 hit off the coast of eastern Honshu, Japan today. NEIC reported it was felt with intensity IV in Koriyama, Fukushima and with intensity II-III in Ibaraki, Miyagi, Tochigi Prefectures, Japan. This follows an M 5.6 yesterday. These may be related to the current strong activity in the Lombok area of Indonesia. As noted in previous issues of this summary the last strong quake in Lombok occurred March 10, 2011, the day before the great quake of M 9.2 which killed more than 20,000 in Honshu, Japan on March 11, 2011. These epicenters are at 51-52 degrees separation on the surface, the seventh node. It is likely that some seismic promotion from Lombok, Indonesia helped trigger the activity in Japan over the past several days. This event like the M 5.6 yesterday nearby is located at the seventh node (51 degrees) from Lombok, Indonesia.

 

A series of earthquakes also occurred in the southern Kuril Islands as Shanshan passed that area today. They were not felt in this region. Among these was an M 5.1, the strongest outside Lombok aftershock area today in the world and had been expected in previous issues of this summary as:

 

"As TS Shanshan moves north it may encounter the Kuril Islands around August 9-10 but this is unlikely since it is expected veer to the east after reaching Tokyo. A moderate to strong induced earthquake in the region of Tokyo is possible as Shanshan passes by the area." (August 5-6, 2018)

 

Forecast 118678 had expected the event off Honshu was likely around August 6 while the activity in the Kuril Islands had been anticipated within about 50 km around August 7. The activity in the Kuril Islands is located at 60 degrees (node 6) from Lombok, Indonesia and at the seventh node (52 degrees) from Hawaii and may have been promoted from those source.

 

O:  8AUG2018 09:07:19  37.3N  141.3E mb=4.7  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  6AUG2018 118678    39.0N  142.0E 4.0-5.6 ABAAA  Off East Coast Honshu      

 

O:  8AUG2018 11:19:15  44.2N  149.4E mb=4.9  EMSC   KURIL ISLANDS                

O:  8AUG2018 08:26:00  44.3N  149.4E mb=4.8  EMSC   KURIL ISLANDS                

O:  8AUG2018 06:58:13  44.4N  149.4E mb=4.3  EMSC   KURIL ISLANDS                

O:  8AUG2018 13:27:01  44.4N  149.3E mb=5.1  EMSC   KURIL ISLANDS                

P:  7AUG2018 118720    44.0N  149.0E 3.5-5.8 AAAAA  Hokkaido, Japan            

 

An unusual earthquake of M 5.0 occurred today in the Scotia Sea north of Antarctica. This is a remote area and it was not reported felt. The last earthquake in the Scotia Sea within about 300 km of this epicenter with M>=5.0 was an M 5.9 on May 6,2017 and before that an M 5.1 on July 8, 2016.  Forecast 118840 had expected this event within about 150 km around August 3. This event is located at 108 degrees from Lombok, Indonesia and may have been promoted from that source.

 

O:  8AUG2018 19:14:51  60.7S   41.3W mb=5.0  EMSC   SCOTIA SEA                   

P:  3AUG2018 118840    60.0S   44.0W 3.0-5.8 BABAA  So. So. America            

 

A light earthquake of M 2.7 in the St. Lawrence Valley region of Quebec Canada was lightly felt today. This epicenter is located at 141 degrees from the Lombok, Indonesia activity, a distance at which seismic energy is concentrated following strong quakes and may have been promoted from that energy. The last earthquake within about 100 km of this epicenter with M>=2.7 occurred as an M 2.7 on January 4, 2017 and October 17, 2017. The last of larger magnitude in this area was an M 3.0 on May 22, 2017. Forecast 118725 had expected this event was likely within about 50 around August 9.

 

O:  8AUG2018 08:50:11  47.5N   70.3W ML=2.7  EMSC   LAWRENCE VALLEY REG., CANADA 

O: 08AUG2018 08:50:11  47.5N   70.3W ML=2.7  NRCA  16 km SW from La Malbaie

P:  9AUG2018 118725    47.0N   70.0W 2.0-4.3 AAAAA  Maine                      

 

 

No earthquakes of M>=3 were located today in Hawaii. The largest recorded today was M 2.9.

MODERATELY STRONG QUAKE SHAKES OFF EASTERN HONSHU, JAPAN

 

EARTHQUAKE SUMMARY FOR AUGUST 7, 2018

 

A moderately large earthquake of M 5.6 occurred off the east coast of Honshu, Japan today. This epicenter is near that of the great quake of March 11, 2011 (M>9). NEIC reported today's earthquake was felt with intensity II-III in Natori and Sendai, Miyagi; in Ibaraki in Hitachi, Tokai, Naka, Toride and in Tokyo, Japan. Today's activity had been expected in the previous issue of this summary and prior to that as a promoted quake from Typhoon Shanshan which passed over today's epicenter today as:

 

"As TS Shanshan moves north it may encounter the Kuril Islands around August 9-10 but this is unlikely since it is expected veer to the east after reaching Tokyo. A moderate to strong induced earthquake in the region of Tokyo is possible as Shanshan passes by the area." (August 5-6, 2018)

 

The last earthquake of M>=5.6 within about 200 km of this epicenter was an M 5.8 on November 12, 2017 and prior to that events of M 6.0 and 6.1 on October 6, 2017 and September 20, 2017. Forecast 118678 had expected today's event in this region was likely around August 6.

 

O:  7AUG2018 15:12:56  37.9N  144.1E Mw=5.6  EMSC   OFF EAST COAST OF HONSHU, JAPA

P:  6AUG2018 118678    39.0N  142.0E 4.0-5.6 ABBAA  Off East Coast Honshu      

 

 

The death toll in the Lombok M 7.0 earthquake has risen to 131 confirmed and is expected to rise. Thousands were also injured, including several thousand hospitalized - many seriously and thousands of buildings were damaged or destroyed. The foreshock of M 6.4 killed 19 in late July, 2018. The last earthquake which took more lives was an M 7.8 in Ecuador which causes 676 deaths. Previous to that the most killed in an earth/tsunami occurred on March 11, 2011 with 20,896 confirmed deaths. The Lombok quake also displaced nearly 156,000 according to Indonesian government sources. Other major earthquake disasters during the 21st century included an event in southern China May 12, 2008 which killed 87,587 and the great quake in Indonesia (and tsunami) of December 26, 2004 (M 9.2) which took 227,898 lives. The earthquake of January 12, 2010 in Haiti may have killed 100,000-316,000 lives.

 

Moderate aftershocks of M 4.0 and 4.5-4.9 were reported felt in the Lombok region of Indonesia today. NEIC reported this earthquake of M 4.5 in Lombok, Indonesia was felt with intensity II-III in the area(s) of Bali at Karangasem, Ubud and Kuta, Indonesia. An earlier M 4.5 was felt with intensity II-III in Mataram, Ubud and Singaraja, Bali, Indonesia. BMG the M 4.0 was felt with intensity III in Lombok and II in Mataram, Indonesia. The M 4.9 was reported felt with intensity III-IV in Mataram and II in Karangasem, Indonesia. Forecast 118595 had expected this activity was likely around August 5.

 

O:  7AUG2018 14:04:38   8.2S  116.2E ML=4.0  EMSC   LOMBOK REGION, INDONESIA     

O:  8AUG2018 02:10:56   8.4S  116.2E mb=4.5  EMSC   LOMBOK REGION, INDONESIA     

O:  7AUG2018 14:04:38   8.2S  116.2E MS=4.0  BMG  Felt with intensity III in Lombo

O:  8AUG2018 02:10:54   8.3S  116.2E MS=4.9  BMG  Felt with intensity III-IV in Ma

P:  5AUG2018 118595     9.0S  116.0E 4.0-5.6 BAAAA  So. of Bali                

 

No earthquakes of M>2.5 were recorded in Hawaii today as Hurricane Hector passed to the south. With the passage of Hector some seismicity may resume in Hawaii in the next several days.

 

The largest earthquake in the world today was an M 5.4-5.8 quake in the Greenland Sea east of Norway. It was followed by an M 4.6 aftershock. Neither were felt in this remote area. The last event in the Greenland Sea within about 250 km of this epicenter with M>5.6-5.8 was an M 6.1 on May 24, 2012. Forecast 118792 had expected today's quake within about 100 km of this epicenter was likely around August 6. This earthquake is located at 103 degrees from the M 7.0 in Lombok, Indonesia. Energy from large earthquakes reflects and refracts off internal earth boundaries and is redirected to this distance on  the surface. Strong seismic enhancement often follows in this distance zone suggesting triggering at a distance.

 

O:  7AUG2018 16:55:49  74.7N    9.0E mb=4.6  EMSC   GREENLAND SEA                

O:  7AUG2018 13:57:09  74.8N    8.9E mb=5.4  EMSC   GREENLAND SEA                

O:  7AUG2018 13:57:09  74.7N    8.4E mb=5.8  ANSS   GREENLAND SEA                

P:  6AUG2018 118792    74.0N   14.0E 3.0-4.4 AAAAA  Norway                     

 

A moderate M 5.4 earthquake also hit northern Colombia today. NEIC reported this earthquake of M 5.4 in Colombia was felt with intensity IV in Bucaramanga, Segovia, Bello, La Estrella (V), and II-III in the area(s) of Colombia at Barranquilla, Cartagena, Villamaria, Manizales, Caldas, Puerto Lopez, Itagui, Sabaneta, Envigado, Medellin, Caucasia, Fomeque, Carmen de Viboral, Bogota, Facatativa, La Calera, Cota, Gacheta, Zipaquira, Yacopi, Aguazul, Cucuta, Duitama, Barrancabermeja, Giron San Gil, Floridablanca, Piedcuesta, Colombia.

No major damage was reported from this intermediate depth hypocenter but because of the depth, it was widely felt on the surface. The last earthquake of M>=5.4 in Northern Colombia within about 200 km of this epicenter occurred October 14, 2015 with M 5.4. The last of larger magnitude was an M 6.2 on March 10, 2015. Forecast 118567 had expected today's earthquake was likely within about 25 km of the epicenter around August 10. As the event occurred near local solar noon, it is likely it was promoted by tidal stresses which maximize at this hour. This epicenter is within about 200 km of  the antipode of an M 4.5 which occurred several hours later in the region south of Java and probably helped promote that subsequent event.

 

O:  7AUG2018 15:53:58   6.8N   73.0W Mw=5.4  EMSC   NORTHERN COLOMBIA            

P: 10AUG2018 118567     7.0N   73.0W 4.0-5.6 BAAAA  Colombia                   

 

O:  7AUG2018 19:13:45   8.9S  106.7E mb=4.5  EMSC   SOUTH OF JAVA, INDONESIA     

P:  7AUG2018 118596     8.0S  108.0E 4.0-5.4 AAAAA  So. of Java                

 

This epicenter in Grenada is within about 50 km of the antipode of the M 5.4 in Sumbawa which occurred yesterday. It is likely it was promoted from that source in Sumbawa, Indonesia. An earthquake of M 5.1 hit southwest of this epicenter on June 23, 2018. Forecast 118630 had expected this event was likely in the Windward Islands around August  6.

 

O:  7AUG2018 19:10:48  11.8N   61.2W ML=3.9  EMSC   GRENADA REGION, WINDWARD ISLAN

P:  6AUG2018 118630    10.0N   63.0W 3.4-5.0 ABBAA  Windward Islands           

 

O:  6AUG2018 12:06:27  11.5S  118.2E mb=4.9  EMSC   SOUTH OF SUMBAWA, INDONESIA  

O: 06AUG2018 12:06:26  11.5S  118.2E MS=5.6  BMG  Felt with intensity II

P:  6AUG2018 118804    11.0S  118.0E 4.0-5.4 AAAAA  So. of Indonesia           

 

HAWAII REMAINS QUIET

 

EARTHQUAKE SUMMARY FOR AUGUST 6, 2018

 

Seismicity in Hawaii today was again at background levels. No earthquakes of M>=3 were recorded today for the second day in a row. The change in this  eruption began two days ago as Hurricane Hector approached the island. Hurricane Hector is now a category 4 hurricane, the first of this strength in the area in years. Among changes in the seismicity of the area today was an M 2.8 near Hilo, Hawaii outside the eruption zone. NEIC reported it was felt with intensity IV in Hilo, Papaaloa, Ninole, and II-III within about 50 km of this epicenter at Waikoloa, Kamuela, Honokaa, Ookala, Honomu, Pepeekeo, Laupahoehoe, Papaikou, Paauilo, Hakalau, Hawaii.

 

 

A moderate earthquake of M 4.6 shook the region of Tokyo today as a typhoon passed to the east. NEIC reported it was felt with intensity II-III in Chiba, Tokyo, Kanagawa, and Saitama Prefectures. An earlier M 4.7 east of this shook Chiba and Tokyo with intensity II-III. These events occurred as Typhoon Shanshan approached these epicenters from the east. This summary had anticipated this activity was likely in previous issues as:

 

"As TS Shanshan moves north it may encounter the Kuril Islands around August 9-10 but this is unlikely since it is expected veer to the east after reaching Tokyo. A moderate to strong induced earthquake in the region of Tokyo is possible as Shanshan passes by the area." (August 5-6, 2018)

 

The last activity in the Tokyo area with M>=4.7 occurred on July 16, 2018 and have occurred in this area about once a month this year. The largest during 2018 was an M 5.9 on July 7, 2018.  Forecasts 118677 had expected these quaakes were likely between August 4 and 9 within about 50 km of these epicenters.

 

O:  6AUG2018 20:10:54  35.5N  140.3E mb=4.6  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  4AUG2018 118677    35.0N  140.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

O:  6AUG2018 10:56:05  35.5N  141.2E mb=4.7  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  9AUG2018 118677    35.0N  141.0E 4.0-5.4 BAAAA  Off East Coast Honshu      

 

Aftershocks in the Lombok area of Indonesia continued to be felt. The death

toll from these and the M 6.9 mainshock has now reached 98 confirmed. Today's

aftershocks included an M 5.4 felt with intensity II-III in Mataram, Praya, Karangasem, Ubud, Bali, Denpasar, Kuta, Singaraja, Indonesia.

BMG reported the M4.5 was felt with intensity II-III in Mataram, Lombok, and Denpasar, Indonesia. The M 4.1 was felt with intensity II in Mataram, Lombok, Indonesia. The M 5.5 was felt with intensity II-III in Denpasar and Kuta and III in Lombok and Mataram, Indonesia. The M 5.4 was felt with intensity IV in Mataram and Gerung; III in Lombok; II-II in Karangasem and Kuta and II in Sumbawa, Denpasr, Tabanan and Ubud, Indonesia. The M 4.0 was felt with intensity III in Praya, Kediri and Labuapi and II in Lingsar and Mataram, Lombok,  Indonesia. Forecast 118595 had expected this activity was likely within about 100 km of this epicenter around August 5.

 

O: 07AUG2018 06:01:11  08.3S  116.0E MS=4.5  BMG  Felt with intensity II-III in Mataram, Lombok, and Denpasar, Indonesia.

O: 07AUG2018 00:13:25  08.3S  116.0E MS=4.1  BMG  Felt with intensity II

O: 07AUG2018 00:13:25   8.2S  116.2E ML=4.1  EMSC   LOMBOK REGION, INDONESIA

O: 07AUG2018 06:01:11   8.3S  116.0E ML=4.5  EMSC   LOMBOK REGION, INDONESIA

O: 06AUG2018 14:18:13   8.3S  116.2E ML=4.0  EMSC   LOMBOK REGION, INDONESIA

O: 06AUG2018 18:21:21   8.3S  116.4E Mw=5.4  EMSC   LOMBOK REGION, INDONESIA

O: 06AUG2018 18:21:19  08.2S  116.3E MS=5.5  BMG  Felt with intensity II-III

O: 06AUG2018 15:50:55  08.3S  116.0E MS=5.4  BMG  Felt with intensity IV

O: 06AUG2018 14:18:13  08.3S  116.2E MS=4.0  BMG  Felt with intensity III

O:  6AUG2018 15:50:56   8.4S  116.1E Mw=5.2  EMSC   LOMBOK REGION, INDONESIA      

P:  5AUG2018 118595     9.0S  116.0E 4.0-5.6 AAAAA  So. of Bali                

 

 

Southeast of Lombok an M 4.9-5.6 was recorded in the Sumbawa, Indonesia region.

BMG reported this earthquake with M 5.6 was felt with intensity II in Kuta, Denpasar and Sumba, Indonesia. This event was probably promoted by changes in regional strain associated with the M 6.9 and 6.4 in Lombok, Indonesia about 400 km to the northwest. The last earthquake in the Sumbawa region of M>=4.9 was an M 5.2 on May 28, 2018, the only such event since October, 2017. The last such event with M>=5.6 was an M 6.2 on December 29, 2016. Forecast 118804 had expected today's epicenter would be active within about 50 km around August 6.

 

O:  6AUG2018 12:06:27  11.5S  118.2E mb=4.9  EMSC   SOUTH OF SUMBAWA, INDONESIA  

O: 06AUG2018 12:06:26  11.5S  118.2E MS=5.6  BMG  Felt with intensity II

P:  6AUG2018 118804    11.0S  118.0E 4.0-5.4 AAAAA  So. of Indonesia           

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in the eastern Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote area. The last earthquake within about 150 km of this event in the eastern Andreanof Islands with M>=4.6 occurred on July 9, 2018 with M 5.2. The only other such event during 2018 was an M 4.7 on March 14, 2018.  Forecast 118758 had expected this event was likely around August 3.

 

O:  6AUG2018 17:05:46  51.7N  173.4W mb=4.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  3AUG2018 118758    52.2N  173.9W 3.5-4.9 BAAAA  Andreanoff Isls, Aleutians 

 

The largest earthquake in the region of Baja and California today was an M 4.3 in an off-and-on series in the northern Gulf of California. This is an active region at the northern end of the Gulf and saw a series of events of M 4.2-4.7 on July 28, 2018. None of these reported strongly felt in this area. Forecast 118681 had expected today's event was likely around August 11 within about 15 km of the epicenter.

 

O:  7AUG2018 02:01:25  30.3N  114.0W ML=4.3  EMSC   GULF OF CALIFORNIA           

P: 11AUG2018 118681    30.2N  114.1W 2.0-4.1 BAAAA  SW U.S.A                   

 

HAWAIIAN SEISMICITY SHUTS DOWN AFTER STRONG LOMBOK EARTHQUAKE

 

EARTHQUAKE SUMMARY FOR AUGUST 5, 2018

 

Two major changes in global seismicity coincided today. For the first time since early June, 2018 there were no earthquakes of M>=3 recorded in Hawaii and the global seismic quiet was broken with an M 6.9-7.0 in the Lombok, Bali area of Indonesia.  The first earthquake in the world of M>=6.5 in the past 93 days occurred today as an M 6.9 in the Lombok region of Indonesia. This event of M 6.9-7.0 is the strongest in the Lombok/Bali area within about 300 km of this epicenter since at least 1990.  An M 6.4 at the same epicenter occurred on July 28, 2018 and probably set the area up for today's major earthquake. The only event in the region of M>=6.5 since 1990 occurred March 10, 2011 with M 6.5, the day before the great earthquake of M>9 off the coast of Honshu, Japan on March 11, 2011 and followed the foreshock of M 7+ to that event in Japan.

 

BMG reported this quake at M 7.0 was felt with intensity VII in Mataram; V-VI in Bima, Karangasem, Denpasat; III-IV in Kuta; III in Waingapu, II-III in Banyuwangi, Situbondo, Malang and II in Sawahan, Lombok, Indonesia.

NEIC reported intensity VIII in Mataram, VI in Karangasem; V in Praya, Sumbawa, Klungkung Uvud, Denpasar,Kuta and Tabanan, Bali and III-IV in Bali at Singaraja, and within about 300 km of the epicenter. The M 5.6 was felt with intensity III-IV in Kuta, Lombok, Indonesia. Aftershocks of M>=5 were reported felt with light intensity II-III in Mataram, Karangasem, Ubud, Denpasar and Kuta, Bali and Lombok, Indonesia. A foreshock of M 6.4 hit the area on July 28 killing 19. At least 91 were killed an hundreds injured in the quake making it the most deadly earthquake in the world since the M 7.9 in Central Mexico September 8, 2017. Initial tolls for that event were 58 killed by aftershocks and regional activity brought the total dead to over 100. Thousands of buildings were damage or destroyed in today's earthquake.

 

This epicenter is antipodal to 9N 64W an area north of Venezuela and south of Puerto Rico. Some sympathetic seismicity may occur in this area in the next several days. Forecast 118595 had expected today's activity was likely around August 5 in the Lombok area. This epicenter is at 100 degrees from the great Gulf of Alaska earthquake of January 23, 2018 and at the fourth node (90 degrees) from Hawaii and may have been promoted from those sources.

 

O: 05AUG2018 11:46:35  08.4S  116.5E MS=7.0  BMG  Felt with intensity VII

O: 05AUG2018 12:49:52  08.3S  116.2E MS=5.6  BMG  Felt with intensity III-IV

O: 05AUG2018 23:46:40   8.2S  116.1E ML=4.2  EMSC   LOMBOK REGION, INDONESIA

O: 05AUG2018 15:20:42   8.2S  116.2E ML=3.9  EMSC   LOMBOK REGION, INDONESIA

O: 05AUG2018 17:11:07   8.2S  116.5E ML=4.1  EMSC   LOMBOK REGION, INDONESIA

O: 05AUG2018 14:42:19   8.2S  116.5E mb=4.3  EMSC   LOMBOK REGION, INDONESIA

O: 05AUG2018 17:42:35   8.3S  116.0E ML=4.5  EMSC   LOMBOK REGION, INDONESIA

O: 05AUG2018 15:11:28   8.3S  116.0E ML=4.8  EMSC   LOMBOK REGION, INDONESIA

O: 06AUG2018 01:53:46   8.3S  116.3E ML=5.1  EMSC   LOMBOK REGION, INDONESIA

O: 05AUG2018 20:41:28   8.3S  116.3E mb=4.6  EMSC   LOMBOK REGION, INDONESIA

O: 05AUG2018 16:49:44   8.3S  116.3E mb=5.0  EMSC   LOMBOK REGION, INDONESIA

O: 05AUG2018 11:46:37   8.3S  116.5E Mw=6.9  EMSC   LOMBOK REGION, INDONESIA

O: 05AUG2018 15:26:53   8.3S  116.5E mb=4.3  EMSC   LOMBOK REGION, INDONESIA

O: 05AUG2018 13:07:36   8.3S  116.5E mb=4.7  EMSC   LOMBOK REGION, INDONESIA

O: 05AUG2018 12:42:33   8.4S  116.2E mb=4.9  EMSC   LOMBOK REGION, INDONESIA

O: 05AUG2018 13:12:14   8.4S  116.2E mb=4.9  EMSC   LOMBOK REGION, INDONESIA

O: 05AUG2018 12:49:55   8.4S  116.2E mb=5.4  EMSC   LOMBOK REGION, INDONESIA

O:  6AUG2018 00:28:17   8.4S  116.3E Mw=5.3  EMSC   LOMBOK REGION, INDONESIA     

P:  5AUG2018 118595     9.0S  116.0E 4.0-5.6 AAAAA  So. of Bali                

 

Today's M 6.9 is the largest in the world since the M 6.9 in Hawaii of May 4 as previously detailed in this summary:

 

 

"Today, August 4 marks the third month (92 days) since an M 6.9 of May 4, 2018 (M 6.9) marked the start of the major eruption of Kilauea in Hawaii. In these three months no earthquakes of M>=6.5 have been recorded in the world. This is highly unusual quiet period, the longest quiet period at this magnitude level since at least 1990. The previous record quiet length in this time period lasted 59 days from May 28, 2012 in Bolivia to July 26, 2012 in the South Indian Ocean and 47 days from April 26 to June 13, 2002, from an M 7.1 in Guam to an M 6.5 in the South Indian Ocean. Other global quiet periods lasting a month or longer since 1989 have occurred starting January 30, 2016 (31 days); November 25, 2013 (37 days); November 24, 2009 (40 days); February 21, 2004 (42 days); August 28, 2000 (35 days). Clearly, the current quiet is highly anomalous. The continuous microseisms from Hawaii during the current period is possibly preventing the buildup of stress around the Pacific Rim and may be promoting the current quiet period. As the eruption of Kilauea diminishes it is likely that an upsurge of strong seismicity around the Pacific Rim (and other areas of the world) will occur. This change in the Hawaii eruption may occur in the next week. A Hurricane (Hector)  will probably pass south of Hawaii around August 9. This may change the eruption in ways which could bring changes to global seismicity. This effect may be being felt at this time. About 31 earthquakes of M>=3 hit the region today without a moderate quake. This is well below the recent average of 40-50 per day." (August 4, 2018)

 

Also as expected in the past two summaries, the seismicity associated with the Kilauea eruption at levels of M>=3 virtually came to a stand still today. No earthquakes of M>=3 were recorded in the region. The last date on which no earthquakes of M>=3 occurred in Hawaii was April 30, 2018. A lull in activity also occurred at the end of May and in early June, 2018 in the region.  Today's change in  Hawaiian seismicity appears to have been closely related to the M 6.9 in Lombok, Indonesia, but may have begun several days before that. This decline in activity in Hawaii had been anticipated in the previous issue of this summary as:

 

 

"As Hurricane Hector moved towards Hawaii from the east today, a major change was seen in seismicity accompanying the eruption of Kilauea. Only 15 events of M>=3 were recorded in the area today, about half the previous low since the M 6.9 of May 4, 2018 and making it the quietest day in the eruption since that event. The strongest quake in the area today was an M 3.8. This and many other earthquakes were lightly felt, as is normal, in the Volcano, Hawaii area. While this did not happen today, in the previous issue of this summary it had been speculated that the type of change seen today in Hawaii could precede a major increase in global seismicity especially around the Pacific Rim" (August 5, 2018)

 

The strongest quake in the U.S. or Canada today was an M 4.6 and 4.5 in the Rat Islands, Aleutians. This was extension of the seismicity in this region yesterday. This summary had noted in that regard:

 

 

"The strongest earthquakes in the U.S. or Canada today occurred as swarm of moderate events in the Rat Islands, Aleutians, Alaska. These events of M 4.6, 4.2 and 4.1 were not reported felt in this remote area. The swarm began within about 10 minutes of local solar noon with an M 4.2, an event which was probably promoted by high tidal stresses which maximize at this hour. The event of M 4.6 was the strongest within about 150 km of this epicenter in the Rat Islands since an M 4.8 on March 19, 2018. Forecast 118772 had expected today's event was likely around August 7." (August 5, 2018)

 

O:  5AUG2018 06:11:55  51.3N  179.1E mb=4.6  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O:  5AUG2018 10:37:18  51.5N  178.4E mb=4.5  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  7AUG2018 118772    51.0N  179.0E 4.0-5.8 AAAAA  Rat Islands                

 

HAWAII ERUPTION CONTINUES TO DAMPEN GLOBAL SEISMICITY

 

EARTHQUAKE SUMMARY FOR AUGUST 3, 2018

 

Today, August 4 marks the third month (92 days) since an M 6.9 of May 4, 2018 (M 6.9) marked the start of the major eruption of Kilauea in Hawaii. In these three months no earthquakes of M>=6.5 have been recorded in the world. This is highly unusual quiet period, the longest quiet period at this magnitude level since at least 1990. The previous record quiet length  in this time period lasted 59 days from May 28, 2012 in Bolivia to July 26, 2012 in the South Indian Ocean and 47 days from April 26 to June 13, 2002, from an M 7.1 in Guam to an M 6.5 in the South Indian Ocean. Other global quiet periods lasting a month or longer since 1989 have occurred starting January 30, 2016 (31 days); November 25, 2013 (37 days); November 24, 2009 (40 days); February 21, 2004 (42 days); August 28, 2000 (35 days). Clearly, the current quiet is highly anomalous. The continuous microseisms from Hawaii during the current period is possibly preventing the buildup of stress around the Pacific Rim and may be promoting the current quiet period. As the eruption of Kilauea diminishes it is likely that an upsurge of strong seismicity around the Pacific Rim (and other areas of the world) will occur. This change in the Hawaii eruption may occur in the next week. A Hurricane (Hector)  will probably pass south of Hawaii around August 9. This may change the eruption in ways which could bring changes to  global seismicity. This effect may be being felt at this time. About 31 earthquakes of M>=3 hit the region today without a moderate quake. This is well below the recent average of 40-50 per day.

 

The strongest earthquake in the world today was an M 5.8 in the Central Mid-Atlantic Ocean. Readers may recall that an M 5.9 about 200 km east of this was followed in mid-July by a series of quakes off the coast of California and later off the coast of Oregon at or near 103 degrees from the Atlantic epicenter. The 103 distance range in the western North American area passes to the west of these in a relatively non-seismic zone but is close to the event of M 5.3 in Oregon of July 29. Another area which could see triggered seismicity from this quake is Vancouver and the Queen Charlotte Island area of British Columbia where a moderate to strong quake could be triggered.  Some additional seismicity in these regions could be promoted from today's event. The last earthquake within about 200 km of today's epicenter with M>=5.8 occurred as an M 6.5 on November 29, 2017 and prior to that an M 5.8 on March 29, 2014. Forecast 118580 had expected today's event was likely around August 4.

 

O:  3AUG2018 18:50:55   0.9S   22.0W Mw=5.8  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P:  4AUG2018 118580     1.0S   24.0W 4.0-5.6 AABAA  Central Mid-Atlantic       

 

STRONG EARTHQUAKE SHAKES TANIMBAR, INDONESIA

 

EARTHQUAKE SUMMARY FOR AUGUST 2, 2018

 

A moderately strong to strong earthquake hit with M 5.5-6.1 in the Tanimbar region of Indonesia today.  NEIC reported this earthquake of M 5.4 in Tanimbar, Indonesia was felt with intensity II-III in the area(s) of Darwin, Northern Territory, Australia. BMG  reported this earthquake with M 6.1 was felt with intensity II-III in Langgur, Maluku, Indonesia. The last earthquake in the Tanimbar region of Indonesia within about 200 km of this epicenter with M>=5.5 occurred as an M 5.9 on March 2, 2018. The last of M>=6.1 was an M 6.5 on October 12, 2012. Forecasts 118601 and 118361 had expected this ctivity in late July or early August.

 

O:  3AUG2018 05:42:14   6.3S  132.7E Mw=5.4  EMSC   KEP. TANIMBAR REGION, INDONESI

O: 03AUG2018 05:42:18  06.1S  132.7E MS=6.1  BMG  Felt with intensity II-III

P:  3AUG2018 118601     5.0S  134.0E 4.0-5.6 ABBAA  West Irian, PNG            

P: 30JUL2018 118361     7.0S  130.0E 4.0-5.7 BACAA  West Irian, PNG            

 

A strong eruption at Kilauea equivalent to a M 5.3 earthquakes occurred today. NEIC reported it was felt with intensity V in Hawaii National Park and IV in Volcano, Hawaii. Intensity II-III was reported from Mountain View, Hilo, Keaau and Honomu, Hawaii. Many smaller events in Hawaii and were lightly felt in Hawaii National Park and Volcano as well today.

 

O:  2AUG2018 21:55:13  19.4N  155.3W Mw=5.3  EMSC   ISLAND OF HAWAII, HAWAII     

P:  3AUG2018 118634    19.3N  155.4W 4.0-5.4 AAAAA  Hawaii area                

 

An earthquake of M 5.5 occurred today in the region south of the Kermadec Islands, New Zealand. Most moderately large quakes in this area occur to the north of this epicenter. The last of M>=5.5 within about 150 km of today's event occurred on May 18, 2018 with M 6.2. Today's event appears to be the largest aftershock of that to date. Prior to that the area had been quiet at this level since an M 5.6 on July 7, 2015. Forecast 118831 had expected today's event in this area in early August.

 

O:  2AUG2018 13:01:21  34.9S  178.6W Mw=5.5  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 10AUG2018 118831    34.0S  180.0W 4.0-5.6 CAAAA  So. Kermadec Islands       

 

An M 5.3 in southern Qinghai, China was not reported damaging or deadly in the area. But casualties from earthquakes in this area are not often reported immediately so some damage is possible and may be reported at a later time. The last earthquake in Southern Qinghai with M>=5.3 within about 200 km of this epicenter was an M 5.3 on February11, 2015 and prior to that an M 5.3 on August 18, 2008. The last large earthquake in the area was an M 6.0 on March 27, 2004.

Forecast 118452 had expected this event within about 100 km was likely in late July or early August. 

 

O:  3AUG2018 01:34:20  35.0N   92.3E mb=5.3  EMSC   SOUTHERN QINGHAI, CHINA      

P: 29JUL2018 118452    36.0N   93.0E 3.8-5.4 BAAAA  Xizang                     

 

CHIAPAS, MEXICO SHAKE WITH MODERATE QUAKE

 

EARTHQUAKE SUMMARY FOR AUGUST 1, 2018

 

An earthquake of M 5.2 hit off the coast of Chiapas, Mexico near Guatemala today. NEIC reported this earthquake of M 5.2 in Eastern Mexico was felt with intensity II-III in the area(s) of Ocos, San Marcos, Guatemala dnd Comitan, Chiapas, Mexico. The last event near Chiapas within about 150 km of this epicenter with M>=5.2 occurred on June 26, 2018 (M 5.2) and prior to that on November 21, 2017 (M 5.3). Forecast 118365 had expected today's event in Chiapas around August 1.

 

O:  1AUG2018 16:05:59  15.4N   93.3W mb=5.2  EMSC   OFFSHORE CHIAPAS, MEXICO     

O:  1AUG2018 16:05:59  14.9N   93.6W mb=5.2  EMSC   OFFSHORE CHIAPAS, MEXICO     

P:  1AUG2018 118365    14.0N   93.0W 3.5-5.3 ABAAA  Chiapas, Mexico            

 

The strongest earthquake in the world today was an M 5.3 in the Bismarck Sea north of New Guinea. It was not reported felt. The last event of M>=5.3 in

the Bismarck Sea within about 200 km of this epicenter was an M 5.3 on July 18, 2018 and an M 5.4 on July 6. Today's event is probably an aftershock of an M 6.3 within about 50 km of this epicenter which occurred January 26, 2018.  Forecast 118350 had expected this event within about 50 km at the end of July.

 

O:  1AUG2018 20:07:06   3.5S  146.1E Mw=5.3  EMSC   BISMARCK SEA                 

P: 24JUL2018 118350     4.0S  146.0E 4.0-5.6 CAAAA  New Ireland                

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 in the region of the Vancouver Island. The last event within about 100 km of this epicenter reported by NEIC with M>=5 was an M 4.2 on March 1, 2018 and prior to that events of M 4.0, 4.2 and 4.3 on January 14, 2018. This is a long quiet period for the region. Today's event was not reported felt in this remote area. Forecast 118489 had expected today's event was likely within about 10 km of the epicenter at the end of July.

 

O:  1AUG2018 05:39:18  50.2N  130.2W ML=3.1  NRCA  208 km W   of Pt. Hardy        

O:  1AUG2018 04:13:48  50.3N  130.2W ML=4.1  NRCA  205 km W   of Pt. Hardy       

P: 27JUL2018 118489    50.4N  130.2W 3.0-5.1 BAAAA  British Colombia           

P: 31JUL2018 118489    50.6N  130.5W 3.0-5.1 AAAAA  British Colombia           

 

A series of light earthquakes of M 3.2-4.0 also hit the aftershock zone of the M 8.0 in the Gulf of Alaska of January 23, 2018. While no moderate shocks were in this group, this strong swarm may indicate sufficient residual stress to enable a moderate to strong regional aftershock in the short term. Forecast 118484 expected this activity at the end of July. Earthquakes in the region occur nearly daily. The last of M>=4 was an M 4.4 on July 21, 2081. The only other such event in the area in the past month was an M 4.7 on July 13, 2018.

 

O: 02AUG2018 06:21:39  56.1N  149.8W ML=3.2  EMSC   GULF OF ALASKA

O: 02AUG2018 05:29:16  56.3N  149.2W ML=3.7  EMSC   GULF OF ALASKA

O: 02AUG2018 00:06:01  56.5N  148.6W ML=3.4  EMSC   GULF OF ALASKA

O: 01AUG2018 16:17:16  56.5N  148.6W ML=3.7  EMSC   GULF OF ALASKA

O: 01AUG2018 16:17:16  56.5N  148.6W ML=4.0  ANSS   GULF OF ALASKA

O: 02AUG2018 00:34:52  56.5N  148.7W ML=3.6  EMSC   GULF OF ALASKA

O: 02AUG2018 00:12:06  56.6N  148.6W ML=3.3  EMSC   GULF OF ALASKA

O: 02AUG2018 00:21:20  56.6N  148.6W ML=3.3  EMSC   GULF OF ALASKA

O:  1AUG2018 15:22:24  55.9N  149.2W ML=3.7  EMSC   GULF OF ALASKA               

P: 26JUL2018 118484    55.0N  148.9W 3.5-5.0 BAAAA  Gulf of Alaska             

 

An earthquake of M 3.5 in central Oklahoma was widely felt today. Seismicity in the central plains of the U.S. including Oklahoma, Kansas and Nebraska/South Dakota has migrated to the north in recent weeks. Today's event of M 3.5 is the largest in central or southern Oklahoma in more than seven months - since an M 3.8 on December 28, 2017. The last of M>=4.2 occurred a year ago on August 2 (M 3.5) and 3 (M 4.2), 2017. Forecast 118442 expected today's event was likely within about 50 km of this epicenter at the end of July.

 

NEIC reported this earthquake of M 3.5 in Oklahoma was felt with intensity IV in Blanchard, Purcell, Amber, Oklahoma and II-III in the area(s) of Washington, Alex, Lindsey and Oklahoma City, Oklahoma.

 

O:  1AUG2018 10:11:13  35.0N   97.6W mb=3.5  EMSC   OKLAHOMA                     

P: 29JUL2018 118442    35.0N   97.0W 2.0-4.3 BAAAA  Southern Plains            

 

MODERATE QUAKE SHAKES EASTERN HONSHU, JAPAN

 

EARTHQUAKE SUMMARY FOR JULY 31, 2018

 

The strongest earthquake in the world today occurred off the coast of eastern  Honshu, Japan. It was reported by NEIC to have been felt with intensity IV in Fukushima, and Miyagi Prefectures and II-III in Ibaraki, Tochigi, Chiba, Saitama, Tokyo, Iwate, Kanagawa and Aomori, Japan. This epicenter is near the great quake of March, 2011 which may be showing signs of accumulated stress again after a long period of quiet (quiet conditions at major earthquake levels in the epicentral area area expected for decades however). The last earthquake within about 150 km of this epicenter with M>=5.4 was an M  5.6 on February 25, 2018 and prior to that events of M 5.7-5.8 in February and July, 2017. Forecast 118424 had expected this event within about 100 km was likely around July 28.

 

A series of strong ocean storms has passed east of this epicenter in the past week. These may have help promote this enhanced seismicity. For example, Typhoon Jongdari passed south of this epicenter two days ago as noted in this summary:

 

"Typhoon Jongdari (TD 15W) continued today over the Izu Islands, Japan with winds up to 100 kts. It is expected to track to the north over the next day and may  interact with seismic zones during this period. A moderate earthquake near Tokyo occurred today while the eye of Jongdari was in the region and may have been promoted by stresses from this storm." (July 28-30, 2018)

 

O: 31JUL2018 08:42:21  37.2N  141.1E Mw=5.4  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 28JUL2018 118424    36.0N  141.0E 4.0-5.6 BBAAA  Off East Coast Honshu      

 

An M 5.3 earthquakes in Hawaii today was associated with continued strong eruptions at Kilauea. NEIC reported it was felt with intensity IV in Volcano and II-III in Kaunakakai, Pepeekeo, Mountain View, Hilo and Keaau, Hawaii. Many smaller earthquakes in Hawaii were also felt lightly in the Volcano region today.

 

O: 31JUL2018 17:59:45  19.4N  155.3W Mw=5.3  EMSC   ISLAND OF HAWAII, HAWAII     

P: 27JUL2018 118390    19.3N  155.3W 4.0-5.5 BAAAA  Hawaii area                

 

The strongest earthquake in the U.S. or Canada outside Hawaii today was an M 4.4 in the Fox Islands, Aleutians, Alaska. This is the first event within about 150 km of this epicenter with M>=4.4 since an M 4.6 on July 9, 2018 and prior to that an M 4.6 on May 18, 2018. Today's event was not reported felt in this remote area. Forecast 118492 had expected today's epicenter would be active within about 50 km around July 28.

 

O: 31JUL2018 09:08:59  52.7N  166.9W mb=4.4  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 28JUL2018 118492    52.5N  166.5W 3.5-5.2 BAAAA  Fox Islands, Aleutians     

 

LIGHT QUAKE SHAKES AREA NORTH OF SAN FRANCISCO, CALIFORNIA

 

EARTHQUAKE SUMMARY FOR JULY 30, 2018

 

A light earthquake of M 3.7 shook much of the San Pablo Bay north of San Francisco, California today. NEIC reported it was felt with intensity II-III in California at Vallejo, Novato, Pinole, San Pablo, San Rafael, Hercules, Rodeo, Richmond, Crockett, Napa, El Sobrante, American Canyon, Greenbrae and in general within about 75 km of the epicenter. The last earthquake within about 50 km of this epicenter north of San Francisco with M>=3.7 was an M 4.4 on January 4, 2018. A strong earthquake within about 25 km of today's epicenter with M 6.0 hit the region on August 24, 2014 and did considerable damage in the Napa region. Northern California is experiencing a series of major wild fires which have been deadly in the past several weeks. This is the ninth biggest fire in California history. It began July 23 and has killed seven including two firefighters. It is not unusual for strongly felt earthquakes to associated with major wildfires in the area, perhaps due to meteorological stresses on the regional faults. Forecast 118408 had expected this region to see a moderate earthquake around July 31.

 

O: 30JUL2018 22:22:53  38.1N  122.4W Mw=3.7  EMSC   SAN PABLO BAY, CALIFORNIA    

P: 31JUL2018 118408    38.5N  122.7W 2.5-4.5 AAAAA  Central California         

 

The strongest earthquakes in the world today were an M 5.4 Tonga and a second M 5.4 in eastern New Guinea. NEIC reported the quake in New Guinea was felt with intensity III in Alotau, Milne Bay, Papua New Guinea. This epicenter is somewhat unusual being south of most of the moderate activity in the area. The last earthquake within about 200 km of this epicenter with M>=5.4 was an M 5.5 on August 20, 2015 and a similar event on May 15, 2015. The last strong earthquake in the area was an M 6.1 on May 22, 1995. Forecast 118523 had expected today's earthquake was likely within about 25 km of this epicenter around July 29. This epicenter is located at the sixth node (60 degrees) from Hawaii and may have been promoted by energy from that region.

 

O: 30JUL2018 07:46:43   9.7S  150.9E Mw=5.4  EMSC   EASTERN NEW GUINEA REG., P.N.G

P: 29JUL2018 118523    10.0S  151.0E 4.0-5.5 AAAAA  New Ireland                

 

The last event within about 200 km of today's epicenter in Tonga with M>=5.4 occurred June 20 and 21, 2018 with two events of M 5.4. The last of M>5.4 in the area was an M 5.8 on April 17, 2016 and prior to that an M 6.4 on September 24, 2013. Forecast 118542 had expected the earthquake in Tonga was likely within about 50 km of this epicenter around July 27.

 

O: 30JUL2018 06:06:38  23.5S  174.9W mb=5.2  EMSC   TONGA REGION                 

O: 30JUL2018 06:06:38  23.5S  174.9W mb=5.4  ANSS   TONGA REGION                 

P: 27JUL2018 118542    24.0S  175.0W 4.0-5.7 BAAAA  Tonga Islands              

 

A moderate swarm of earthquakes with maximum of M 3.6 occurred in the Virgin Islands today including more than 10 events of M>=3. These were not reported felt. Hurricane season is here and the region often sees strong seismic enhancement in association with strong storms. Forecast 118373 had expected today's activity within about 25 km was likely around July 30.

 

O: 30JUL2018 08:49:25  19.4N   64.7W ML=3.2  EMSC   VIRGIN ISLANDS REGION

O: 30JUL2018 13:11:10  18.8N   64.7W MD=3.4  EMSC   VIRGIN ISLANDS REGION

O: 30JUL2018 09:52:01  18.8N   64.8W MD=3.4  EMSC   VIRGIN ISLANDS REGION

O: 30JUL2018 20:05:35  18.9N   64.6W MD=3.4  EMSC   VIRGIN ISLANDS REGION

O: 30JUL2018 11:20:55  19.0N   64.6W MD=3.3  EMSC   VIRGIN ISLANDS REGION

O: 30JUL2018 17:46:04  19.0N   64.7W MD=3.1  EMSC   VIRGIN ISLANDS REGION

O: 30JUL2018 12:40:20  19.0N   64.8W MD=3.4  EMSC   VIRGIN ISLANDS REGION

O: 30JUL2018 20:55:52  19.2N   64.7W MD=3.4  EMSC   VIRGIN ISLANDS REGION

O: 31JUL2018 04:14:36  19.2N   64.8W MD=3.2  EMSC   VIRGIN ISLANDS REGION

O: 31JUL2018 02:59:41  19.2N   64.9W MD=3.6  EMSC   VIRGIN ISLANDS REGION

O: 30JUL2018 12:34:02  19.2N   65.1W MD=3.3  EMSC   VIRGIN ISLANDS REGION        

P: 30JUL2018 118373    19.0N   65.0W 3.0-5.1 AAAAA  Leeward Islands            

 

 

MODERATE QUAKE SHAKES OREGON COASTLINE

 

EARTHQUAKE SUMMARY FOR JULY 29, 2018

 

The strongest earthquakes in the world today occurred as M 5.3 events off the

Coast of Oregon and in association with the strong eruption at Kilauea, Hawaii. The event off western Oregon was reported by NEIC to have been felt lightly in Oregon at Yachata, Coos Bay, Gold Beach, Blodgett, Rockaway Beach, Eugene. Salem, Albany and possibly in Woodland, Washington. It was followed by a series of moderate aftershocks. The last earthquake in the area off the coast of Oregon with M>=5.3 was an M 5.5 on January 28, 2018 and prior to that an M 5.5 on November 28, 2016. The last of M>=6 was an M 6.0 on April 11, 2012. Forecast 118472 had expected today's events within about 50 km of the epicenter was likely around July 25-29. Today's activity is probably related to the similar swarm off the coast of northern California to the south several days ago through stress redistribution after those earthquakes. Like the earthquakes off California, this area is at 104 degrees from the M 5.9-6.0 in the Central Mid-Atlantic which preceded by a day those events. Today's activity was probably also promoted from the Central Mid-Atlantic. At 128 West longitude this also was probably promoted by high tidal stresses associated with the full moon as noted in previous issues of this summary:

 

“The full moon arrived at 20:20 UT on July 27. Longitudes which were sub-lunar

at this time are near 55 East longitude (Iran, Iraq, Turkey for example) while those at sub-solar conditions are at or near 125 West longitude (examples off the west coast of North America). These regions are most likely to see tidal promotion at this time but other areas can also be triggered by high tidal stresses in the next week.” (July 25-29, 2018)

 

O: 29JUL2018 14:48:25  43.9N  128.9W mb=3.8  EMSC   OFF COAST OF OREGON

O: 29JUL2018 14:27:08  44.0N  128.8W ML=3.2  EMSC   OFF COAST OF OREGON

O: 29JUL2018 14:10:22  44.1N  128.8W Mw=5.3  EMSC   OFF COAST OF OREGON

O: 29JUL2018 14:51:09  44.1N  128.8W mb=4.4  EMSC   OFF COAST OF OREGON

O: 29JUL2018 14:41:06  44.2N  128.5W ML=3.0  EMSC   OFF COAST OF OREGON          

P: 25JUL2018 118472    43.9N  128.4W 3.0-4.7 BAAAA  Off Coast of Oregon        

P: 29JUL2018 118472    44.5N  129.8W 3.0-4.5 AAAAA  Off Coast of Oregon        

 

A strong eruption of Kilauea on Hawaii today was accompanied by an M 5.3 earthquake. NEIC reported it was felt with intensity IV in Kaunakakai, Hawaii and II-III in Hawaii at Volcano, Mountain View, Hilo, Pepeekeo, and Honomu. Many smaller events were also felt lightly in the Volcano, Hawaii today. A moderate hurricane (Gilma) may pass over Hawaii in the next several days. This event of M 5.3 was probably promoted by tidal stresses associated with the full moon. It occurred within about 10 minutes of local solar noon, a time at which tidal stresses are maximized.

 

O: 29JUL2018 22:10:25  19.4N  155.3W Mw=5.3  EMSC   ISLAND OF HAWAII, HAWAII     

P: 27JUL2018 118390    19.3N  155.3W 4.0-5.5 AAAAA  Hawaii area                

 

A series of earthquakes occurred today in the Kuril Islands. This included an

M 5.2 and moderate associated shocks of M 4.7 and 4.7  in the southern Kuril Islands. The last earthquake within about 200 km of this epicenter with M>=5.2 was an M 5.8 on March 7, 2018 and prior to that one year ago on July 30, 2017 with M 5.7. This activity is located at the seventh node (51 degrees) from Hawaii and was probably promoted from energy from that area. Forecast 118477 had expected these earthquakes within about 75 km of this epicenter was likely around July 31.

 

It is likely that these events in the Kurils were promoted by Tropical Storm Wukong which passed over this area yesterday as noted in previous summaries:

 

"TS Wukong (14W) continued today in the North Pacific with winds up to 70 kts. It is expected to track to the north reaching the Kuril Islands around July 27. A moderate to strong quake in the Kurils could occur after that." (July 26-27, 2018)

 

O: 29JUL2018 08:12:35  45.5N  151.6E mb=4.7  EMSC   KURIL ISLANDS

O: 29JUL2018 13:00:52  45.6N  151.6E mb=5.2  EMSC   KURIL ISLANDS

O: 29JUL2018 22:47:44  45.6N  151.7E mb=4.7  EMSC   KURIL ISLANDS                

P: 31JUL2018 118477    45.0N  151.0E 3.5-5.6 AAAAA  So. Kurils                 

 

O: 29JUL2018 09:48:57  49.6N  156.0E mb=4.7  EMSC   KURIL ISLANDS                

P: 29JUL2018 118493    52.0N  158.0E 4.0-5.9 ACBAA  Kamchatka                  

 

Moderate seismicity also continued today with an M 4.1 in the Baja California area of Mexico. This area has seen at least five earthquakes of M>=4 in the past four days. Forecast 118430 had expected today's event in late July.

 

NEIC reported this earthquake of M 4.0 in Baja California was felt within about 100 km with intensity II-III in the area(s) of Baja, California at Ensenada, Puebla and Mexicali and in El Centro, California.

 

O: 29JUL2018 14:19:49  31.9N  115.8W ML=3.0  EMSC   BAJA CALIFORNIA, MEXICO

O: 30JUL2018 06:23:57  31.9N  115.9W ML=2.8  EMSC   BAJA CALIFORNIA, MEXICO

O: 29JUL2018 13:54:07  31.9N  115.9W Mw=4.1  EMSC   BAJA CALIFORNIA, MEXICO

O: 29JUL2018 15:10:35  32.0N  116.3W ML=2.0  EMSC   BAJA CALIFORNIA, MEXICO      

P: 24JUL2018 118430    33.0N  115.9W 2.5-4.5 BAAAA  So. California             

 

LOMBOK, INDONESIA QUAKE KILLS THREE; INJURES MANY

 

EARTHQUAKE SUMMARY FOR JULY 28, 2018

 

The strongest earthquake in the world today was an M 6.4 in the region of Lombok, Bali, Indonesia. NEIC reported intensity V in Mataram and Praya, Nusa Tenggara Barat, Indonesia; IV in Pare, Java and in Bali at Negara, Singaraja, Tabanan, Denpasar, Ubud, and Karangasem. Lesser shaking was reported from Sumbawa, Kuta, Surabaya, Peterongan, Java, Makasar and Sinjai, Sulawesi, Indonesia. Initial reported tolls included three killed by falling concrete and an unspecified number of injuries on Lombok. Aftershocks of M 4.8, 5.4, 5.7 and M 5.2 were reported lightly felt at Mataram and in Bali at Klungkung, Denpasar, Karangasem, Ubud, Kuta and Singaraja, Indonesia. BMG reported the mainshock was felt with intensity VI-VII in Lomok Utara; IV in Barat, Timur and Tengah, Lombok; IV in Mataram, Sumbawa Barat and Besar; III-IV in Denpasar, Kuita, Gianyar, Nusa Dua, Singaraja; III in Bima, Tuban and Waingapu, Lombok, Indonesia. The last earthquake in the Lombok area of Indonesia within about 300 km of this epicenter with M>=6.4 occurred on March 10, 2011 at a depth of 510 km. The last such shallow quake in the area occurred about 250 to the east in Sumbawa on November 24, 2007 with an aftershock of M 6.6 on November 8, 2009. Forecast 118359 expected today's event was likely in the Sumbawa area at the end of July. This epicenter is at 100 degrees,, a distance at which triggering is likely, from the great Alaska quake of January 23, 2018 and at the fourth node (90 degrees) from Hawaii and may have been promoted from those sources. Like the Flores quake of M 6.0 today (see below) it is about 15 degrees south of the local geomagnetic equator and was probably promoted by geomagnetic stresses associated the recent storm.

 

O: 29JUL2018 04:22:51   8.3S  116.5E ML=4.2  EMSC   LOMBOK REGION, INDONESIA     

O: 29JUL2018 00:05:29   8.3S  116.5E ML=4.3  EMSC   LOMBOK REGION, INDONESIA     

O: 29JUL2018 01:50:31   8.3S  116.5E Mw=5.3  EMSC   LOMBOK REGION, INDONESIA     

O: 28JUL2018 23:06:49   8.3S  116.5E Mw=5.4  EMSC   LOMBOK REGION, INDONESIA     

O: 28JUL2018 22:47:37   8.3S  116.5E Mw=6.4  EMSC   LOMBOK REGION, INDONESIA     

O: 29JUL2018 02:20:08   8.3S  116.5E mb=4.8  EMSC   LOMBOK REGION, INDONESIA     

O: 29JUL2018 01:44:24   8.3S  116.6E mb=4.8  EMSC   LOMBOK REGION, INDONESIA     

O: 28JUL2018 23:16:26   8.3S  116.6E mb=4.9  EMSC   LOMBOK REGION, INDONESIA     

O: 29JUL2018 06:52:08   8.6S  116.4E ML=3.5  EMSC   LOMBOK REGION, INDONESIA     

O: 28JUL2018 22:47:39  08.3S  116.6E MS=6.4  BMG  Felt with intensity VI-VII

O: 28JUL2018 23:06:49  08.3S  116.5E MS=5.5  BMG  Felt with intensity IV

O: 28JUL2018 23:15:58  08.3S  116.5E MS=5.0  BMG  Felt with intensity IV

O: 29JUL2018 00:05:29  08.3S  116.5E MS=4.3  BMG  Felt with intensity IV

O: 29JUL2018 01:50:32  08.2S  116.5E MS=5.7  BMG  Felt with intensity IV

O: 29JUL2018 02:20:09  08.3S  116.6E MS=5.0  BMG  Felt with intensity IV

O: 29JUL2018 04:22:51  08.3S  116.6E MS=4.2  BMG  Felt with intensity IV

O: 29JUL2018 10:05:02  08.3S  116.6E MS=4.2  BMG  Felt with intensity IV

P: 31JUL2018 118359     8.0S  119.0E 4.0-5.5 AAAAA  Sumbawa Island area        

 

An earlier large earthquake of M 6.0 also hit in the Flores Sea of Indonesia with deep focus today. NEIC reported it was felt about 700 km from the epicenter at Sinjai, Sulawesi and at Kefamenanu, Nusa Tenggara Timur, Indonesia. Some of these reports, however, may refer to the event in Bali. These earthquakes in Indonesia were likely promoted by the recent geomagnetic storm as reported in the previous issue of this report:

 

 

"The geomagnetic field saw disturbed  conditions today. The AP level was 17 High latitude geomagnetic field also saw active conditions  with AP at 24. This continues the strongest geomagnetic storm a high latitudes in nearly a month – since it reached 33 on June 26. This and coming geomagnetic storms could increase seismicity at high latitudes and near the geomagnetic equator. A strong associated earthquake is most likely between July 25 and 28." (July 25-27, 2018)

 

It is also likely that Indonesia will be active in the next day or two due to effects from this geomagnetic storm." (July 28, 2018)

 

Flores is about 15 degrees south of the local geomagnetic equator where geomagnetic triggering is highest, especially at great depth as with this event. The last earthquake in the Flores Sea with M>=6.0 within about 250 km of today's epicenter occurred October 24, 2017 with M 6.7. Today's quake is probably an aftershock of that. Forecast 118346 had expected a moderately large event in the Flores area around July 26. .

 

BMG reported this earthquake was felt with intensity III in Waingapu, Flores, Indonesia.

 

O: 28JUL2018 17:07:23   7.2S  122.7E Mw=6.0  EMSC   FLORES SEA                    

O: 28JUL2018 17:07:22  07.3S  122.7E MS=6.1  BMG  Felt with intensity III

P: 26JUL2018 118346     8.0S  124.0E 4.0-5.5 AABAA  Flores Island area         

 

A moderately strong earthquake of M 5.6 also shook the Kermadec Islands of northern New Zealand today. NEIC reported this earthquake of M 5.6 in the Kermadec Islands, New Zealand was reported felt with intensity II-III in the area(s) of Whangamata, Waikato, although this seems unlikely. This may be a regional aftershock of an M 6.0 in the region of July 7, 2018. Forecast 118547 expected today's event within about 50 km of this event in the Kermadec Islands.

 

O: 28JUL2018 09:28:20  30.0S  177.5W Mw=5.6  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 29JUL2018 118547    30.0S  178.0W 4.0-5.6 AAAAA  No. Kermadec Islands       

 

A strong eruption of Kilauea on Hawaii today was accompanied by an M 5.3 earthquake. NEIC reported it was felt with intensity II-III in Hawaii at Volcano, Mountain View, Hilo, Keaau and Lahaina. Many smaller events were also felt lightly in the Volcano, Hawaii today.

 

A moderate hurricane (Gilma) may pass over Hawaii in the next several days. As reported in previous issues of this summary, this could change the character of the current eruption at least temporarily. Watch for significant changes in the number of events of M>=3 during this period. The current number of daily occurrence of quakes at this magnitude level is 35-50 (approximately). There were only about 20 such events today so a change may already be in the works. As the character of the eruption in Hawaii changes more and larger earthquakes around the rest of the world may ensue. There have been no earthquakes of M>=6.5 in the world in nearly three months since the Hawaiian eruption began. It is possible that microseisms from Hawaii are preventing the build up of stress and allowing smaller events to replace larger. This could change as the eruption in Hawaii becomes less energetic.

 

"TD Gilma (08E) continued today in the North Pacific southeast of Hawaii with winds up to 40 kts. It is expected to track towards Hawaii reaching that area around July 31 or August 1. It may strongly affect the current eruption of Hawaii. Changes associated with low pressures with TD 08E could change some of the plumbing leading to the current eruption." (July 27-28, 2018)

 

O: 28JUL2018 12:37:26  19.4N  155.3W Mw=5.3  EMSC   ISLAND OF HAWAII, HAWAII     

P: 27JUL2018 118390    19.3N  155.3W 4.0-5.5 AAAAA  Hawaii area                

 

The strongest earthquake California today was an M 3.3-3.5 in Central California. It was reported felt with intensity II-III in San Juan Bautista, Hollister, Salinas, Gilroy, Watsonville, San Martin, Carmel Valley, Felton and San Mateo, California. The last earthquake within about 50 km of this epicenter in Central California with M>=3.3 was an M 3.3 on May 26, 2018. The last of M>=3.5 was an M 3.6 on January 24, 2018. Forecast 118406 expected today's activity within about 10 km of the epicenter around July 25.

 

O: 28JUL2018 09:22:21  36.6N  121.1W MD=2.2  EMSC   CENTRAL CALIFORNIA           

O: 28JUL2018 16:01:59  36.8N  121.4W MD=2.4  EMSC   CENTRAL CALIFORNIA           

O: 28JUL2018 07:57:11  36.8N  121.4W Mw=3.3  EMSC   CENTRAL CALIFORNIA           

O: 28JUL2018 07:57:11  36.8N  121.4W Mw=3.5  ANSS   CENTRAL CALIFORNIA           

P: 25JUL2018 118406    36.7N  121.4W 2.5-4.6 BAAAA  Central California         

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 in Southern

Alaska. The last earthquake within about 150 km of this epicenter with M>=4.1 occurred March 13, 2018 with M 4.3. The last strong quake in the area was an M 7.1 on January 24, 2016 - today's event is probably an aftershock of that. Forecast 118507 had expected today's event was likely within about 50 km around July 29.

 

O: 28JUL2018 14:22:25  59.4N  153.3W mb=4.1  EMSC   SOUTHERN ALASKA              

O: 28JUL2018 16:24:03  59.6N  153.1W ML=3.2  EMSC   SOUTHERN ALASKA              

P: 29JUL2018 118507    60.2N  153.2W 3.2-5.1 AAAAA  Central Alaska             

 

MODERATE SWARM IN NORTHERN BAJA PROBABLY PROMOTED BY FULL MOON TIDES

 

EARTHQUAKE SUMMARY FOR JULY 27, 2018

 

A series of moderate earthquakes hit northern Baja California today. These included an M 4.2, 4.5 and 4.6 which was reported by NEIC to have been felt in California and Arizona. This continues the activation of the area which began with the series of M 5.0-5.7 events off the coast of northern California and continued with moderate quakes in Baja California yesterday and today. This region often activates with high tidal stresses associated with full and new moons and this was probably a precipitating factor in today's swarm which occurred several hours after the full moon. The last activity with M>=4.5 within about 100 km of this epicenter occurred on March 28, 2016 and September 15, 2014. Forecast 118427 had expected this activity within about 50 km of the epicenter was likely around July 30.

 

The activity in California and Baja may also have been promoted by the strong geomagnetic storm of July 25-26. Strong global and regional activation with this storm had been expected in this summary to occur around July 26-28 as:

 

"The geomagnetic field saw disturbed  conditions today. The AP level was 17 High latitude geomagnetic field also saw active conditions  with AP at 24. This continues the strongest geomagnetic storm a high latitudes in nearly a month – since it reached 33 on June 26. This and coming geomagnetic storms could increase seismicity at high latitudes and near the geomagnetic equator. A strong associated earthquake is most likely between July 25 and 28." (July 25-27, 2018)

 

It is also likely that Indonesia will be active in the next day or two due to effects from this geomagnetic storm.

 

The seismicity forecast associated with the full moon had noted:

 

"The full moon will arrive at 20:20 UT on July 27. Longitudes which are sub-lunar at this time are near 55 East longitude (Iran, Iraq, Turkey for example) while those at sub-solar conditions are at or near 125 West longitude (examples off the west coast of North America). These regions are most likely to see tidal promotion at this time but other areas can also be triggered by high tidal stresses in the next week." (July 26-28, 2018)

 

These events in the Baja/Gulf of California region are at 104 degrees from the M 7.6 of February 25, 2018. This event still appears to be promoting seismicity in the region of Southern California, along with more recent stress producers.

 

O: 28JUL2018 04:12:20  30.7N  114.4W ML=4.2  EMSC   GULF OF CALIFORNIA            

O: 28JUL2018 02:19:24  31.3N  114.3W ML=4.6  EMSC   GULF OF CALIFORNIA           

O: 28JUL2018 02:33:51  31.4N  114.3W mb=4.5  EMSC   GULF OF CALIFORNIA           

P: 30JUL2018 118427    30.2N  114.1W 2.0-4.1 AAAAA  SW U.S.A                   

 

The strongest earthquake in the U.S. or Canada today occurred in the Bering Sea of Alaska. This is the strongest earthquake in the Bering Sea within about 300 km of this epicenter since an M 5.0 on July 24, 2010, eight years ago. A strong quake hit the area with M 6.5 on April 30, 2010. Today's event may be an aftershock of that quake.

 

O: 27JUL2018 18:23:12  60.4N  177.5W Mw=4.9  EMSC   BERING SEA                   

 

A moderate earthquake of M 5.0 shook the Izu Islands of Japan today as Typhoon Jongdari was passing over the epicenter. This and several moderate earthquakes in the Tokyo area north of this were probably promoted by stresses from Jondari.

 

"Typhoon Jongdari (TD 15W) continued today over the Izu Islands, Japan with winds up to 100 kts. It is expected to track to the north over the next day and may  interact with seismic zones during this period. A moderate earthquake near Tokyo occurred today while the eye of Jongdari was in the region and may have been promoted by stresses from this storm." (July 27, 2018)

 

 

O: 28JUL2018 00:50:04  30.7N  141.8E Mw=5.0  EMSC   IZU ISLANDS, JAPAN REGION    

P: 31JUL2018 118440    30.0N  143.0E 4.0-5.5 BAAAA  So. of Honshu              

 

The strongest earthquake in the world today was an M 5.3 in El Salvador. NEIC reported this earthquake of M 5.3 in El Salvador was felt with intensity IV in Santo  Tomas, San Salvador and II-III in the area(s) of Soyapango, San Salvador, Delgado, Antiguo Cuscatlan, La Paz Centro, Nicaragua and in Costa Rica at Florencia and Quepos.  The last earthquake of M>=5.3 in or near El Salvador was an M 5.6 on May 6, 2018, an aftershock of an M 5.9 of April 2, 2018. That was the first such regional activity since November 24, 2016 when an M 7.0 shook the region. Forecast 118378 had expected today's event was likely within about 100 km of this epicenter around July 27.

 

O: 27JUL2018 20:42:03  12.7N   88.2W Mw=5.3  EMSC   OFFSHORE EL SALVADOR         

P: 27JUL2018 118378    12.0N   88.0W 3.5-5.3 AAAAA  Nicaragua                  

 

SEISMICITY CONTINUES IN SOUTH SANDWICH ISLANDS

 

EARTHQUAKE SUMMARY FOR JULY 26, 2018

 

Seismicity around the world today continued much as it did yesterday. The largest quake in the world was again in the South Sandwich Island. This event of M 5.4 was not felt. It follows an M 5.6 in the same region which was the largest earthquake yesterday. Forecast 118561 had expected today's event within about 100 km of this epicenter was likely around July 27.

 

O: 26JUL2018 12:56:52  56.9S   26.4W mb=5.4  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 27JUL2018 118561    56.0S   28.0W 4.0-5.8 AAAAA  So. Sandwich Islands       

 

A moderate earthquake of M 5.3 occurred today in association with a strong eruption at Kilauea, Hawaii. NEIC reported this quake was felt with intensity II-III in Hawaii at Volcano, Mountain View, Hilo, Keaau, Pepeekeo and Honomu and in general within about 50 km of the epicenter. This earthquake occurred at local solar noon with the full moon and was probably triggered by high tidal stresses which maximized at this time. A number of smaller earthquakes were also felt lightly in the Volcano area of Hawaii today.

 

O: 26JUL2018 22:09:11  19.4N  155.3W Mw=5.2  EMSC   ISLAND OF HAWAII, HAWAII     

P: 27JUL2018 118390    19.3N  155.3W 4.0-5.5 AAAAA  Hawaii area                

 

A series of events of M 2-3 occurred in the region of Mammoth Lakes, California today. While earthquakes in this region are common, a swarm such as this has not been  seen in the region since March 17, 2018. That swarm continued for three days. Minor swarms occurred June 12 and April 22, 2018.  A series of strong earthquakes hit the region in 1980 about the same time as the Mt. St. Helens eruption in Washington State. There was speculation that the two episodes were related. Forecast 118404 expected this activity within about 25 km of these epicenters was likely around July 26.

 

O: 27JUL2018 00:16:30  37.4N  118.5W MD=2.2  EMSC   CENTRAL CALIFORNIA

O: 27JUL2018 00:12:13  37.4N  118.5W MD=2.4  EMSC   CENTRAL CALIFORNIA

O: 26JUL2018 12:26:51  37.6N  118.8W MD=2.1  EMSC   CENTRAL CALIFORNIA

O: 27JUL2018 02:30:34  37.6N  118.9W MD=2.0  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 27JUL2018 05:50:19  37.6N  118.9W MD=2.0  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 27JUL2018 00:04:09  37.6N  118.9W MD=2.1  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 27JUL2018 00:49:18  37.6N  118.9W MD=2.2  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 27JUL2018 02:52:46  37.6N  118.9W MD=2.5  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 27JUL2018 05:49:12  37.6N  118.9W MD=2.9  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 27JUL2018 05:55:57  38.4N  118.3W ml=2.5  EMSC   NEVADA                       

P: 26JUL2018 118404    37.5N  118.6W 2.5-4.6 AAAAA  California/Nevada area     

 

The strongest earthquake in California today was an M 3.5 in the Tahoe area

of Northern California.  NEIC reported this earthquake of M 3.5 in Northern California was felt with intensity II-III in the area(s) of Camelian Bay, Tahoe Vista, Kings Beach, Olympic Valley, Tahoe City, Truckee, Incline Village, Floriston, Tahoma, Homewood, Reno, and Washoe Valley, Nevada and in general within about 100 km of the epicenter. This is the strongest earthquake within about 50 km of this epicenter since an M 4.0 a year ago on June 27, 2017 and prior to that as an M 4.3 on December 23, 2015. Forecast 118172 had expected this event in this region was likely around July 21.

 

O: 26JUL2018 07:22:25  39.2N  120.1W ML=3.5  EMSC   NORTHERN CALIFORNIA          

P: 21JUL2018 118172    39.4N  120.5W 2.5-4.4 BAAAA  Central California          

 

A series of moderate earthquakes struck today around the Japanese islands. Most of these were associated with Tropical Storms Jongdari and Wukong. The expected paths of these storms has changed and larger associated seismicity is no longer expected. In the previous issue of this summary it had been noted:

 

"TS Jongdari (TD 15W) continued today west of the northern Mariana Islands with winds up to 70 kts. It is expected to track to the north over the next four days but not to interact with seismic zones during this period. By July 30, it will be over northern Honshu, a  position where unloading will occur on Japan, promoting a moderate to strong subduction zone quake in that area at the end of July or early August." (July 26, 2018)

 

The M 4.3 in the Volcano Islands today occurred as Jongdari was passing over this epicenter and was probably triggered by stresses associated with this storm.

 

O: 26JUL2018 11:45:57  24.3N  141.6E mb=4.3  EMSC   VOLCANO ISLANDS, JAPAN REGION

P: 28JUL2018 118388    25.0N  142.0E 4.0-5.6 AAAAA  Bonin Islands              

 

O: 27JUL2018 01:25:24  26.2N  128.9E mb=4.6  EMSC   RYUKYU ISLANDS, JAPAN        

P: 25JUL2018 118395    27.0N  125.0E 4.0-5.6 AACAA  Ryukyu Islands             

 

O: 27JUL2018 06:24:51  39.8N  141.8E mb=4.3  EMSC   EASTERN HONSHU, JAPAN        

P: 30JUL2018 118457    40.0N  142.0E 3.5-5.6 BAAAA  Hokkaido, Japan            

 

"TS Wukong (14W) continued today in the North Pacific with winds up to 70 kts. It is expected to track to the north reaching the Kuril Islands around July 27. A moderate to strong quake in the Kurils could occur after that." (July 26, 2018)

 

O: 27JUL2018 04:54:08  45.5N  147.9E mb=4.9  EMSC   KURIL ISLANDS                

P: 26JUL2018 118457    44.0N  147.0E 3.5-5.8 ABAAA  Hokkaido, Japan            

 

O: 26JUL2018 12:02:55  46.5N  152.3E mb=4.5  EMSC   KURIL ISLANDS                

P: 31JUL2018 118477    45.0N  151.0E 3.5-5.6 BBAAA  So. Kurils                 

 

MODERATELY LARGE QUAKE IN SOUTH SANDWICH ISLANDS

 

EARTHQUAKE SUMMARY FOR JULY 25, 2018

 

The strongest earthquake in the world today was an M 5.6 in the South Sandwich Islands, South Atlantic. It was not felt in this remote area but does continue a series of moderately large quakes in this area which have been occurring this year. The last earthquake in the South Sandwich Islands with M>=5.6 within about

250 km of today's epicenter was an M 5.7 on June 26, 2018 but seven such events have occurred since March, 2018. Forecast 118561 had expected today's event within about 25 km of the epicenter was likely around July 27.

 

O: 25JUL2018 19:45:06  56.2S   27.8W Mw=5.6  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 27JUL2018 118561    56.0S   28.0W 4.0-5.8 AAAAA  So. Sandwich Islands       

 

A moderate earthquake and aftershocks were felt in the region south of California near Ensenada,  Baja California today. NEIC reported maximum intensity IV for the M 4.2 in Baja California at Tijuana and Ensenada and II-III in El Sauzal,  Maneadero, Rosarito, La Joya, Primo Tapia,  and in California at San Diego, Chula Vista, Spring Valley, El Cajon, Campo, Potrero, and in general within about 150 km of the epicenter. The last earthquake within about 50 km of this epicenter in Baja California with M>=4.2 was an M 4.3 nearly three years ago on November 13, 2015 and prior to that on December 26, 2013 (M 4.2). Forecasts 118428 and 118430 had expected a moderate regional event was likely around July 24.

 

O: 25JUL2018 20:42:19  32.0N  116.3W ML=2.6  EMSC   BAJA CALIFORNIA, MEXICO

O: 25JUL2018 20:45:23  32.0N  116.3W ML=3.0  EMSC   BAJA CALIFORNIA, MEXICO

O: 25JUL2018 20:58:47  32.0N  116.3W ML=3.0  EMSC   BAJA CALIFORNIA, MEXICO

O: 25JUL2018 20:17:55  31.9N  116.3W Mw=4.2  EMSC   BAJA CALIFORNIA, MEXICO      

P: 24JUL2018 118428    32.0N  117.4W 2.5-4.7 AABAA  So. California             

P: 24JUL2018 118430    33.0N  115.9W 2.5-4.5 ABAAA  So. California             

 

A series of minor earthquakes occurred today in Yellowstone National Park, Wyoming. While small, these may be important. Recent reports suggest new fissures opening up in the area which were not associated with new seismicity and these could be the opening salvo of such activity. There were no earthquakes of M>=2 in Yellowstone recorded in the three week period between July 5 and July 24. In the 15 hour period from 21:35 on July 25 and 11:52 on July 25, five such events occurred. Areas where seismicity is modulated by water (such as Yellowstone) often become active with full and new moons and tidal promotion is also likely in this case. Forecast 118482 had expected this activity within about 25 km of the epicenters was likely around July 27.

 

O: 25JUL2018 10:49:59  44.8N  110.8W ML=2.1  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 25JUL2018 11:52:36  44.8N  110.8W ML=2.1  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 25JUL2018 09:12:06  44.8N  110.8W Ml=2.1  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P: 27JUL2018 118482    44.6N  110.8W 2.0-4.0 AAAAA  Yellowstone/Wyoming        

 

The most unusual earthquake in the U.S. today was an M 3.5 in northern Nebraska, part of a series in that area which began in late June with M 4.2 on June 30 and has continued off-and-on through July 25 (M 2.2). Forecast 118488 had expected this activity was likely around July 26.

 

NEIC reported this earthquake of M 3.5 in Nebraska was felt with intensity IV in the area(s) of Arnold, Nebraska.

 

O: 26JUL2018 05:09:45  41.4N  100.2W mb=3.5  EMSC   NEBRASKA                     

P: 26JUL2018 118448    39.7N  100.0W 2.0-4.2 ABAAA  Nebraska                   

 

Several moderate earthquakes occurred today in the Kuril Islands as Tropical Storm Wukong approached this region from the south. This activity is expected to continue for several more days as stresses from this storm become more disruptive. This summary had previously noted this possibility as:

 

"TS Wukong (14W) continued today in the North Pacific with winds up to 70 kts. It is expected to track to the north reaching the Kuril Islands around July 27. A moderate to strong quake in the Kurils could occur after that." (July 25-26, 2018)

 

O: 25JUL2018 12:37:48  46.7N  152.6E mb=4.6  EMSC   KURIL ISLANDS                

P: 31JUL2018 118477    45.0N  151.0E 3.5-5.6 CBAAA  So. Kurils                 

 

O: 25JUL2018 16:07:53  50.3N  156.8E mb=4.0  EMSC   KURIL ISLANDS                

P: 18JUL2018 118258    51.0N  157.0E 4.0-5.9 CAAAA  Kamchatka                  

 

STRONG EARTHQUAKE SWARM STRIKES OFF NORTHERN CALIFORNIA; OREGON

 

EARTHQUAKE SUMMARY FOR JULY 24, 2018

 

A moderately strong earthquake earthquake of M 5.6-5.7 shook the coast of northern California and Oregon today. NEIC reported light shaking in California at Arcata, Eureka, Bayside, Hoopa, Windsor and Cotati and in Oregon at Coos Bay, Reedsport, Blue River, Bend.

 

The mainshock was accompanied by a series of foreshocks and aftershocks. An M 4.5 was reported by NEIC to have been felt in northern California with intensity II-III in Ferndale, Petrolia, Rio Dell, Fortuna, Scotia, Eureka, Carlotta, Whitethorn, Arcata, Myers Flat, McKinleyville, Alderpoint, Piercy, Leggett, and Laytonville, California. A regional aftershock of M 4.9 off the coast of Oregon was reported felt in Oregon at Coquille and Coos Bay, Oregon. An M 5.2 foreshock was felt with intensity II in Seal Rock, Oregon. Among the foreshocks was an M 2.7 near Petrolia, California earlier in the day.

 

The mainshock was located at 103 degrees from the M 5.9-6.0 in the Central Mid-Atlantic yesterday, a distance at which triggering is expected. It had been expected in the previous issues of this summary as:

 

"As noted in yesterday's report the quakes in Iran may activate portions of central and northern California. The distance of northern California and offshore is 101-103 degrees from the event in the mid-Atlantic. This may further help bring renewed activity to this region in the next several days." (July 24, 2018)

 

and

 

"Strong earthquakes in this area (Iran) can help promote higher magnitudes of quake in the San Andreas/Central California area because wavefronts from Iran are parallel to this fault zone when they arrive in the area of California." (July 23, 2018)

 

It is remarkable that the strongest quakes in the past two days - in Iran and

Northern California are at opposite longitudes (55E and 125W). This can be thought of as slicing the earth into two hemispheres through the center with Northern California and Iran on the edge of the slice. This is made more notable by the fact that the maximum tidal stresses with the coming full moon are at these same longitudes as noted in the tidal forecast summary in this report:

 

"The full moon will arrive at 20:20 UT on July 27. Longitudes which are sub-lunar at this time are new 55 East longitude (Iran, Iraq, Turkey for example) while those at sub-solar conditions are at or near 125 West longitude (examples off the west coast of North America). These regions are most likely to see tidal promotion at this time but other areas can also be triggered by high tidal stresses in the next week." (July 25, 2018)

 

The earthquakes in Northern California also coincided with the strongest geomagnetic storm in more than a month. This may have helped promote this scattered  seismicity off California and may also help promote additional California seismicity in the coming days.

 

The last earthquake within about 200 km of today's M 5.6 with M>=5.6 occurred January 25, 2018 with M 5.8 and prior to that on September 22, 2017 (M 5.7).  The occurrence of three events of M>=5 in the area on one day, however is rarer with the last such occurrence on January 16, 2003 - similar to today's with M 5.5, 5.1 and 5.2. Forecast 118471 had expected today's activity was likely within about 25 km of today's M 5.6 epicenter was likely around July 24.

 

O: 24JUL2018 16:00:17  41.7N  126.8W ML=2.8  EMSC   OFF COAST OF NORTHERN CALIFORNIA

O: 24JUL2018 12:16:34  41.7N  126.9W mb=5.0  EMSC   OFF COAST OF NORTHERN CALIFORNIA

O: 24JUL2018 14:33:27  41.8N  126.6W Ml=3.4  EMSC   OFF COAST OF NORTHERN CALIFORNIA

O: 24JUL2018 14:38:30  41.8N  126.7W ML=3.2  EMSC   OFF COAST OF NORTHERN CALIFORNIA

O: 24JUL2018 14:35:43  41.8N  126.7W mb=4.3  EMSC   OFF COAST OF NORTHERN CALIFORNIA

O: 24JUL2018 14:42:04  41.8N  126.7W mb=4.3  EMSC   OFF COAST OF NORTHERN CALIFORNIA

O: 24JUL2018 14:28:16  41.8N  126.8W Mw=5.2  EMSC   OFF COAST OF NORTHERN CALIFORNIA

O: 24JUL2018 17:52:03  41.8N  126.9W ML=3.1  EMSC   OFF COAST OF NORTHERN CALIFORNIA

O: 24JUL2018 17:22:35  41.8N  127.0W Mw=4.9  EMSC   OFF COAST OF NORTHERN CALIFORNIA

O: 24JUL2018 14:44:53  41.9N  127.0W Mw=5.6  EMSC   OFF COAST OF NORTHERN CALIFORNIA

O: 24JUL2018 18:56:34  41.9N  127.9W ML=3.1  EMSC   OFF COAST OF NORTHERN CALIFORN

P: 24JUL2018 118471    42.1N  126.9W 3.0-4.8 AAAAA  Off Coast of Oregon        

 

The M 4.5 regional aftershock closer to Northern California is the largest within about 100 km of that epicenter since a similar M 4.5 on May 7, 2018. The last such event of significantly larger magnitude was an M 5.1 on July 29, 2017, a year ago. Forecast 118470 expected today's M 4.5 was likely around July 29, 2018.

 

O: 24JUL2018 08:07:15  40.4N  125.4W MD=2.7  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 25JUL2018 05:06:04  40.3N  125.1W Mw=4.5  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 29JUL2018 118470    40.5N  125.8W 2.5-4.6 BAAAA  Off Coast of No. Calif     

 

 

A moderate earthquake of M 5.3 in Hawaii was also associated with the eruption of Kilauea today. NEIC reported it was felt with intensity V in Volcano, Hawaii and II-III in Mountain View, Hilo, Keaau and Kaunakakai, Hawaii. No damage was reported. A number of smaller earthquakes associated with the  eruption were also lightly felt in the Volcano, Hawaii region.

 

O: 24JUL2018 16:41:10  19.4N  155.3W Mw=5.3  EMSC   ISLAND OF HAWAII, HAWAII     

P: 24JUL2018 118390    19.3N  155.3W 4.0-5.5 AAAAA  Hawaii area                

 

A light earthquake of M 2.2 continued the series in Nebraska and South Dakota today. It was not reported felt but may be related to the strong activity  off northern California today. This report has previously noted the link between seismicity in these two areas. Forecast 118448 expected a light earthquake in northern Nebraska around July 26.

 

O: 25JUL2018 02:37:09  41.4N  100.1W mb=2.2  EMSC   NEBRASKA                     

P: 26JUL2018 118448    39.7N  100.0W 2.0-4.2 ABAAA  Nebraska                   

 

An unusual earthquake of M 5.3-5.5 occurred today southeast of the Ryukyu Islands, Japan. This may be related to the passage of Tropical Storm Jongdari near this epicenter at the time of the earthquake as noted in this summary:

 

"TS Jongdari (TD 15W) continued today west of the northern Mariana Islands with winds up to 50 kts. It is expected to track to the north over the next four days but not to interact with seismic zones during this period. By July 30, it will be over northern Honshu, a  position where unloading will occur on Japan, promoting a moderate to strong subduction zone quake in that area at the end of July or early August." (July 25, 2018)

 

This is an unusual epicenter with the last event of M>=5.5 within about 100 km occurring on May 26, 2010 with M 6.5. Forecast 118395 had expected activity in the Ryukyu Islands west of this epicenter around July 25.

 

O: 25JUL2018 04:20:30  25.4N  130.4E Mw=5.3  EMSC   SOUTHEAST OF RYUKYU ISLANDS  

O: 25JUL2018 04:20:30  25.4N  130.5E mw=5.5  ANSS   ESE of Haebaru Japan

P: 25JUL2018 118395    27.0N  125.0E 4.0-5.6 ABCAA  Ryukyu Islands             

 

STRONG QUAKE IN MID-ATLANTIC MAY AFFECT NORTH AMERICAN SEISMICITY

 

EARTHQUAKE SUMMARY FOR JULY 23, 2018

 

The strongest earthquake in the world today was an M 5.9 on the central mid-Atlantic west of NW Africa. This area often becomes active in late summer with the arrival of hurricane season. At M 5.9 this quake is the largest within about 200 km of this epicenter since an M 7.1 on August 29, 2016 and prior to that an M 6.4 on December 9, 2009. Forecast 118343 had expected today's event within about 100 km of this epicenter around July 26.

 

As noted in yesterday's report the quakes in Iran may activate portions of central and northern California. The distance of northern California and offshore is 101-103 degrees from the event in the mid-Atlantic. This may further help bring renewed activity to this region in the next several days.

 

O: 23JUL2018 10:36:00   0.3S   19.3W Mw=5.9  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P: 26JUL2018 118343     1.0S   20.0W 4.0-5.7 BAAAA  Central Mid-Atlantic       

 

The strongest earthquake in the U.S. or Canada outside Alaska or Hawaii today was an M 3.7 in eastern Montana. NEIC reported it was felt with intensity II-III in Montana at Pony, Silver Star, Cardwell and Whitehall. The last earthquake in Western Montana within about 100 km of this epicenter with M>=3.7 occurred September 3, 2016 with M 4.0. Forecast 118464 had expected this event was possible at this epicenter around July 24.

 

O: 24JUL2018 04:56:10  45.7N  112.1W ML=3.7  EMSC   WESTERN MONTANA              

P: 24JUL2018 118464    45.7N  112.1W 2.0-4.0 AAAAA  Montana/Idaho              

 

The strongest earthquake in the U.S. today was an M 5.5 associated with a strong eruption of Kilauea. NEIC reported it was felt with intensity IV in Laie, Hawaii and II-III in Volcano, Mountain View, Hilo,and Pepeekeo, Hawaii. Many lesser quakes were also felt lightly in the region of Volcano, Hawaii. Forecast 118135 had expected this activity around July 20.

 

 

O: 23JUL2018 06:53:38  19.4N  155.3W Mw=5.5  EMSC   ISLAND OF HAWAII, HAWAII     

O: 23JUL2018 06:53:38  19.4N  155.3W mw=5.5  ANSS   WSW of Volcano Hawaii

P: 20JUL2018 118135    19.9N  156.1W 3.0-4.6 BAAAA  Hawaii                     

 

A pair of moderate earthquakes in the Alaska Peninsula today of M 4.9 and 4.4 occurred about 250 km southeast of the recent strong activity in the area. It is not classical aftershocks of those events but may have been promoted by stress redistribution from them. The last earthquakes within about 200 km of today's events were an M 5.1 on May 11, 2018 and prior to that an M 5.3 on November 12, 2016. Forecast 118483 had expected today's activity within about 50 km was likely around July 24.

 

O: 24JUL2018 04:12:41  55.1N  157.5W mb=4.4  EMSC   ALASKA PENINSULA             

O: 24JUL2018 04:17:06  55.2N  157.6W mb=4.9  EMSC   ALASKA PENINSULA             

O: 23JUL2018 11:32:09  57.4N  155.2W Ml=3.0  EMSC   ALASKA PENINSULA             

P: 24JUL2018 118483    55.7N  157.9W 3.5-5.0 AAAAA  Alaska Peninsula

 

 

IRANIAN QUAKES AT THE FOREFRONT

 

EARTHQUAKE SUMMARY FOR JULY 22, 2018

 

The strongest seismicity in the world today continued in Iran. These occurred at three separate epicenters with moderate to large events and included an M 5.9, an M 5.5 and M 5.4.  An event of M 5.5 in southern Iran was reported felt with intensity V in Kerman, and II-III in Bahramabad and Giroft, Kerman, Iran and possibly in Irbil, Iraq. Strong earthquakes in this area can help promote higher magnitudes of quake in the San Andreas/Central California area because wavefronts from Iran are parallel to this fault zone when they arrive in the area of California. Much of this activity is at the third node (120 degrees) from Hawaii and may have been promoted by energy from that area.

 

The earthquake in western Iran of M 5.9 was reported with intensity VIII in Kermanshah and VI in Halubah and Javanrud and Aslamabad. Intensity V shook Kordestan with lesser shaking in Ilam, Diyala, Iran. It was also felt in Iraq with intensity II-IV at Kirkuk, Balad and other communities within about 300 km of the epicenter. Some damage was incurred in the epicentral zone in western Iran in the Kermanshah area. This is the largest earthquake in western Iran within about 200 km of this epicenter since an M 7.3 on November 12, 2107 and is probably the strongest aftershock to date of that event. The only other activity in the region since 1990 with M>=5.9 occurred on August 8, 2014 with M 6.0 and 6.2 about 250 km to the southwest of today's epicenter. Forecast 118186 had expected this event within about 150 km was likely around July 18.

 

O: 22JUL2018 16:48:48  34.5N   46.4E mb=4.4  EMSC   WESTERN IRAN

O: 22JUL2018 12:41:47  34.6N   46.2E ML=3.5  EMSC   WESTERN IRAN

O: 22JUL2018 10:46:09  34.6N   46.3E ML=3.9  EMSC   WESTERN IRAN

O: 22JUL2018 19:08:58  34.6N   46.4E ML=3.8  EMSC   WESTERN IRAN

O: 23JUL2018 01:13:44  34.7N   46.3E ML=3.5  EMSC   WESTERN IRAN

O: 23JUL2018 00:59:50  34.7N   46.4E mb=4.3  EMSC   WESTERN IRAN

O: 22JUL2018 10:07:26  34.5N   46.1E Mw=5.8  EMSC   WESTERN IRAN                 

O: 22JUL2018 10:07:26  34.6N   46.2E mb=5.9  ANSS   Sarpol-e Zahab Iran

P: 18JUL2018 118186    36.0N   46.0E 3.8-5.4 BBAAA  No. Iran                   

 

An earthquake of M 5.5 in Eastern Iran also occurred today. It was felt in the epicentral area but no damage was reported. The last earthquake of M>=5.5 within  about 200 km of this epicenter was an M      6.0 on December 12, 2017 in a continuing series which began on December 1, 2017. Prior to that events of M 5.5 occurred on January 22, 2016 and January 21, 2013. Forecast 118204 had expected today's event within about 100 km of the epicenter was likely around July 21.

 

O: 22JUL2018 20:39:16  30.3N   57.5E Mw=5.5  EMSC   EASTERN IRAN                 

P: 21JUL2018 118204    31.0N   57.0E 3.8-5.5 AAAAA  So. Iran                   

 

A smaller event of M 4.8 in southern Iran occurred within minutes of local solar midnight as was probably promoted by tidal stresses which maximize at this hour.

 

O: 22JUL2018 20:59:51  27.5N   54.9E mb=4.8  EMSC   SOUTHERN IRAN                

O: 22JUL2018 17:23:02  27.5N   55.0E ML=4.0  EMSC   SOUTHERN IRAN                

P: 19JUL2018 118163    28.0N   54.0E 3.5-5.4 BAAAA  So. Iran/Persian Gulf      

 

A moderate earthquake of M 5.4 was felt in Southern Iran today. It was associated with foreshocks and aftershocks of M 4.0 and 4.6. This activity may have been promoted by landfall of TS Son-Tinh in Vietnam. Faults across much of southern Asia often fail with landfall of storms in this area of southeastern Asia. It is likely that a general activation of the region could follow as noted in this summary:

 

"TS Son-tinh (TD 11W) continued today west of the northern Philippines with winds up to 45 kts.  It is expected to dissipate over Vietnam today. Some increased seismicity  on strike-slip faults further inland in Asia may be associated with landfall today." (July 21, 2018)

 

The last earthquake in Southern Iran within about 200 km of this epicenter with

M>=5.4 was an M 5.4 on January 22, 2016. The last of significantly larger magnitude occurred July 20, 2010. Forecast 118163 had expected today's event within about 100 km of the epicenter around July 19. This activity is at the fourth node (90 degrees) from the PNG quake of February and may have been promoted from that source.

 

O: 22JUL2018 05:59:20  27.5N   55.0E ML=4.0  EMSC   SOUTHERN IRAN                

O: 22JUL2018 05:04:48  27.6N   54.8E mb=4.6  EMSC   SOUTHERN IRAN                

O: 22JUL2018 05:07:02  27.7N   54.9E Mw=5.4  EMSC   SOUTHERN IRAN                

P: 19JUL2018 118163    28.0N   54.0E 3.5-5.4 AAAAA  So. Iran/Persian Gulf      

 

 

The strongest earthquake in the U.S. today was an M 5.5 associated with a strong eruption of Kilauea. NEIC reported it was felt with intensity IV in Laie, Hawaii and II-III in Volcano, Mountain View, Hilo,and Pepeekeo, Hawaii. Many lesser quakes were also felt lightly in the region of Volcano, Hawaii. Forecast 118135 had expected this activity around July 20.

 

O: 23JUL2018 06:53:38  19.4N  155.3W Mw=5.5  EMSC   ISLAND OF HAWAII, HAWAII     

O: 23JUL2018 06:53:38  19.4N  155.3W mw=5.5  ANSS   WSW of Volcano Hawaii

P: 20JUL2018 118135    19.9N  156.1W 3.0-4.6 BAAAA  Hawaii                     

 

 

 

 

MODERATE IRANIAN QUAKE MAY PRECEDE ADDITIONAL ACTIVITY

 

EARTHQUAKE SUMMARY FOR JULY 21, 2018

 

A moderate earthquake of M 5.4 was felt in Southern Iran today. It was associated with foreshocks and aftershocks of M 4.0 and 4.6. This activity may have been promoted by landfall of TS Son-Tinh in Vietnam. Faults across much of southern Asia often fail with landfall of storms in this area of southeastern Asia. It is likely that a general activation of the region could follow as noted in this summary:

 

"TS Son-tinh (TD 11W) continued today west of the northern Philippines with winds up to 45 kts.  It is expected to dissipate over Vietnam today. Some increased seismicity  on strike-slip faults further inland in Asia may be associated with landfall today." (July 21, 2018)

 

The last earthquake in Southern Iran within about 200 km of this epicenter with

M>=5.4 was an M 5.4 on January 22, 2016. The last of significantly larger magnitude occurred July 20, 2010. Forecast 118163 had expected today's event within about 100 km of the epicenter around July 19. This activity is at the fourth node (90 degrees) from the PNG quake of February and may have been promoted from that source.

 

O: 22JUL2018 05:59:20  27.5N   55.0E ML=4.0  EMSC   SOUTHERN IRAN                

O: 22JUL2018 05:04:48  27.6N   54.8E mb=4.6  EMSC   SOUTHERN IRAN                

O: 22JUL2018 05:07:02  27.7N   54.9E Mw=5.4  EMSC   SOUTHERN IRAN                

P: 19JUL2018 118163    28.0N   54.0E 3.5-5.4 AAAAA  So. Iran/Persian Gulf      

 

The strongest earthquake in the U.S. today was an M 5.4 associated with a strong eruption of Kilauea. NEIC reported it was felt with intensity IV in Volcano and Pahoa and II-III in Mountain View, Hilo, Papaikou and Pepeekeo, Hawaii..

Many lesser quakes were also felt lightly in the region of Volcano, Hawaii. Forecast 118135 had expected this activity around July 15. Overall with about 30 events of M>=3 today, the seismicity of Hawaii was well below what it has been for weeks.

 

O: 21JUL2018 19:43:28  19.4N  155.3W Mw=5.4  EMSC   ISLAND OF HAWAII, HAWAII     

P: 20JUL2018 118135    19.9N  156.1W 3.0-4.6 AAAAA  Hawaii                     

 

Moderate aftershocks including an M 5.4 also continued today in the Alaska Peninsula which has seen a series of moderate to large quakes in the past several days. These have not  been reported felt in the region but represent a significant enhancement in  regional seismicity as noted in previous issues of this summary:

 

 

"A moderately strong earthquake of M 5.6 hit western Alaska today. NEIC reported this earthquake was felt with intensity VI in King Cove and II-III in Chignik and possibly Soldotna, Alaska. This is the strongest earthquake within about 250 km of this epicenter since an M 5.6-5.7 on May 28, 2017 and prior to that an M 5.8 on October 27, 2016. The last event of M>=6 in the area was an M 6.1 on July 16, 2011. The only events of M>5.6 in Alaska in the past year was the M 7.9-8.0 on January 23, 2018 in the Gulf of Alaska.   Forecast 118251 had expected it within about 100 km of the epicenter around July 17. This epicenter is located at the 10th node (36 degrees) from the M 6.9 in Hawaii of May 4, the strongest earthquake in the world in the past two months. Alaska has been active in recent days and this event may help to alleviate some of the regional stress." (July 19, 2018)

 

O: 21JUL2018 08:15:17  54.4N  160.8W mb=3.7  EMSC   ALASKA PENINSULA             

O: 21JUL2018 07:58:39  54.5N  160.9W Mw=5.4  EMSC   ALASKA PENINSULA             

P: 17JUL2018 118251    54.8N  158.7W 3.5-4.9 BABAA  Alaska Peninsula           

 

An unusual earthquake of M 3.5 hit near the South Dakota-Nebraska border today near Valentine, Nebraska. NEIC reported it was felt with intensity IV in Valentine and Ainsworth, Nebraska and in Mission, South Dakota. Lesser shaking of intensity II-III was reported from Saint Francis and Winner, South Dakota and Cody, Nebraska. The last earthquake within about 100 km of this epicenter in South Dakota with M>=3.5 occurred on October 18, 2012 (M 3.6). Events of M 4.0 and 4.3 hit slightly further than 100 km from today's epicenter on May 25, 2003 and M 4.3 on November 3, 2002, the largest in the region since 1990. It was closely associated with the great Denali earthquake in Alaska of the same date (M 8.0). Unusual earthquakes in northwestern Missouri and in the Broken Bow area of central Nebraska along with a series of moderate to strong quakes in the Alaska Peninsula over the past week have  tended to reinforce this relation. This epicenter is at the seventh node (51 degrees) from Hawaii and the fifth node (72 degrees) from the Bolivia quake of April, 2018 and may have been promoted by energy from these sources.

 

 

O: 21JUL2018 07:11:30  43.0N  100.6W mb=3.5  EMSC   SOUTH DAKOTA                 

O: 21JUL2018 07:11:30  43.0N  100.6W mb=3.5  ANSS   NNW of Valentine Nebraska

 

A moderate earthquake of M 5.4 also occurred near the antipode of Nebraska and Missouri today. It was not felt in this remote area, but may have been related to the unusual seismicity in the central plains of the U.S. today. The last  earthquakes in the Southeast Indian Ridge within about 300 km of today's epicenter with M>=5.4 occurred as events of M 5.4-5.5 on August 6, 2017; May 11, 2014 and October 3, 2010. Forecast 118324 had expected this region would be active around July 18.

 

O: 21JUL2018 20:56:23  48.2S   99.6E mb=5.4  EMSC   SOUTHEAST INDIAN RIDGE       

P: 18JUL2018 118324    46.0S   96.0E 4.0-5.6 BCBAA  So. Indian Ocean           

 

A pair of moderate earthquakes also shook New Zealand today. The largest of these occurred near Nelson, South Island with M 4.8. The other was an M 4.6 under North Island.  GEONET reported this earthquake was felt with light intensity northeast of Okahune and in southwestern North Island and northern South Island. Light to moderate intensity was reported throughout much of southern and western North Island and northern South Island. More than 130 people reported feeling this earthquake with  90 reports of weak intensity; 38 of light intensity; 2 with moderate intensity; 0 with strong intensity; and 0 of severe intensity. The last earthquake within about 100 km of this epicenter with M>=4.6 was an M M 5.4 about 50 km east of this on July 10. Fouor earthquakes of M>=4.6 have hit this region during 2018. Forecast 118322 had expected today's activity within about 50 km was likely around July 18.

 

O: 21JUL2018 19:06:22  39.5S  176.1E mb=4.4  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 21JUL2018 19:06:23  39.4S  176.1E ML=4.6  GEONET Felt with light intensity

P: 18JUL2018 118322    40.0S  176.0E 3.0-4.6 BAAAA  North Island, N.Z.         

 

GEONET reported the earthquake of M 4.8-5.4 near Nelson was felt with moderate intensity in the northern South Island area. There were 8134 felt reports mostly from northern South Island, New Zealand. These included 3786 of weak shaking. Light intensity was felt by 3715 and moderate intensity by 595 person. Strong shaking was felt by 36 with one each reporting extreme and severe shaking. NEIC reported this earthquake of M 4.6 in Nelson, North Island, New Zealand was felt with intensity V in Porirua, IV in Wellington, and II-III in the area(s) of Nelson, New Zealand. An M 5.4 last hit the region on January 5, 2017. Forecast 118325 had expected today's event was likely within about 50 km of the epicenter around July 20.

 

O: 22JUL2018 03:14:43  41.1S  173.6E mb=4.8  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 22JUL2018 03:14:44  41.2S  173.5E MB=5.4  GEONET Felt with moderate intensity

P: 20JUL2018 118325    41.0S  174.0E 3.0-5.1 AAAAA  So. Island, N.Z.           

 

The geomagnetic field saw quiet  conditions today. The AP level was 11 High latitude geomagnetic field saw disturbed conditions  with AP at 27. This is the strongest geomagnetic storm a high latitudes in nearly a month – since it reached 33 on June 26. This and coming geomagnetic storms could increase seismicity at high latitudes and near the geomagnetic equator. A strong associated earthquake is most likely between July 23 and 27.

 

MODERATELY STRONG QUAKES UNDER MARIANA IS; ARGENTINA CONTINUE GLOBAL ACTIVATION

 

EARTHQUAKE SUMMARY FOR JULY 20, 2018

 

Moderately strong earthquakes shook the northern Mariana Islands and a deep hypocenter under Argentina with M 5.6-5.7 each today. These continued the sudden global seismic activation which began two days ago. The earthquake in the northern Mariana Islands of M 5.7 was reported by NEIC to have been felt with intensity IV in Garapan, Saipan and in Tinian, Guam, Mariana Islands. The last earthquake within about 200 km of this epicenter with M>=5.7 occurred on September 14, 2017. Both are likely aftershocks of an M 7.7 which hit the area on July 29, 2016. Forecast 118145 had expected today's event was likely around July 16 within about 50 km of the epicenter. It is likely this was promoted by strong typhoon which passed directly over this epicenter earlier this month as noted in previous issues of this summary:

 

"Super-Typhoon Maria (TS 10W) continued today over Guam with winds up to 150 kts. It is expected to track to the northwest passing over Guam as a typhoon on  July 5-6. This storm could trigger a moderate to large quake in the region of Guam and the southern Mariana Islands which are currently seeing seismicity at moderately high levels." (July 7, 2018)

 

This quake in the Northern Marianas occurred at the sixth node (60 degrees) from the great Gulf of Alaska quake and was likely promoted from that source.

 

O: 20JUL2018 23:56:07  18.5N  145.9E Mw=5.7  EMSC   PAGAN REG., N. MARIANA ISLANDS

P: 16JUL2018 118145    18.0N  146.0E 4.0-5.4 BAAAA  No. Marianas               

 

The earthquake in Argentina of M 5.6 was not widely felt on the surface due to its deep focus. It is located near the antipode of TD 13 and TS Ampil current strong storms in the Philippines and Ryukyu Islands and may have been promoted by microseisms from that activity. This is the strongest earthquake within about

300 km of this epicenter since an M 5.6 on March 25, 2018 about 150 km to the north and prior to that an M 5.8 on November 13, 2015 about 250 km to the southwest of today's epicenter.  Forecast 118299 had expected today's event was likely in mid-July. This epicenter is located at 106 degrees from the great Gulf of Alaska quake and at 101 degrees from Hawaii and may have been promoted from those sources. 

 

O: 20JUL2018 10:24:56  28.1S   63.2W Mw=5.6  EMSC   SANTIAGO DEL ESTERO, ARGENTINA

P: 15JUL2018 118299    28.0S   67.0W 4.0-5.8 BACAA  Argentina                  

 

An earthquake of M 2.6 was felt widely in the region of northwestern Missouri and Kansas today. NEIC reported intensity II-III in Missouri at Saint Joseph, Amazonia, Agency, Faucett, De Kalb, Rayville, Trenton, Kirsville, Salem, and in Kansas at Wathena, Troy, Overland Park. It was also reported lightly felt in Saline, Michigan and Park River, North Dakota. This may be related to the M 6.0 in the Alaska yesterday. Earthquakes in Nebraska and South Dakota often are associated with strong earthquakes in Alaska - before or after those events. This relation has been frequently noted in this summary.  This is a very unusual earthquake and may point to additional seismicity in the area of Missouri and the Dakotas. A series of earthquakes in central Nebraska over the past two weeks near Broken Bow was probably precursory to the strong earthquakes in Alaska of the past two days as previously suggested in this summary. The last earthquake within about 100 km of today's Missouri epicenter was an M 3.1 on March 23, 2007 and prior to that an M 3.0 on May 13, 1999. Forecast 118209 had expected a light quake in the area in mid-July. This area should be watched as it may also indicate a spreading of the Oklahoma/Kansas/Nebraska activity into an extended area of the central Plain States of the U.S.

 

O: 20JUL2018 22:46:49  39.8N   94.9W mb=2.6  EMSC   MISSOURI                     

P: 15JUL2018 118209    38.0N   99.0W 2.0-4.3 BBCAA  Southern Plains            

 

The strongest earthquake in the U.S. or Canada today occurred off the coast of Oregon with M 3.9. NEIC reported this earthquake of M 3.9 off the coast of Oregon  may have been felt with intensity II-III in the area(s) of Florence, Oregon. This earthquake is the strongest within about 200 km of this epicenter off the coast of Oregon with  M>=3.9 was an M 4.6 two months ago on May 24, 2018. Forecast 118236 had expected this event was likely in mid-July within this region.

 

O: 20JUL2018 11:04:04  43.9N  128.1W mb=3.9  EMSC   OFF COAST OF OREGON          

P: 16JUL2018 118236    44.3N  129.4W 3.0-4.6 BAAAA  Off Coast of Oregon        

P: 20JUL2018 118236    43.1N  126.5W 3.0-4.7 AABAA  Off Coast of Oregon        

 

MODERATELY STRONG QUAKE IN ALASKA

 

EARTHQUAKE SUMMARY FOR JULY 18, 2018

 

A moderately strong earthquake of M 5.6 hit western Alaska today. NEIC reported this earthquake was felt with intensity VI in King Cove and II-III in Chignik and possibly Soldotna, Alaska. This is the strongest earthquake within about 250 km of this epicenter since an M 5.6-5.7 on May 28, 2017 and prior to that an M 5.8 on October 27, 2016. The last event of M>=6 in the area was an M 6.1 on July 16, 2011. The only events of M>5.6 in Alaska in the past year was the M 7.9-8.0 on January 23, 2018 in the Gulf of Alaska.  Forecast 118251 had expected it within about 100 km of the epicenter around July 17. This epicenter is located at the 10th node (36 degrees) from the M 6.9 in Hawaii of May 4, the strongest earthquake in the world in the past two months. Alaska has been active in recent days and this event may help to alleviate some of the regional stress.

 

O: 18JUL2018 19:06:03  54.4N  160.7W Mw=5.6  EMSC   ALASKA PENINSULA             

O: 18JUL2018 19:06:03  54.4N  160.7W mw=5.6  ANSS   Chernabura Island Alaska

O: 19JUL2018 02:28:16  54.5N  160.8W ML=3.6  EMSC   ALASKA PENINSULA             

P: 17JUL2018 118251    54.8N  158.7W 3.5-4.9 AAAAA  Alaska Peninsula           

 

The second strongest earthquake in the U.S. today was an M 5.3 associated with a strong eruption of Kilauea. NEIC reported it was felt with intensity IV in Volcano, and II in Mountain View, Hilo, Kealakekua and Kaunakakai, Hawaii.

Many lesser quakes were also felt lightly in the region of Volcano, Hawaii. Forecast 118135 had expected this activity around July 15. Overall with about 30 events of M>=3 today, the seismicity of Hawaii was well below what it has been for weeks.

 

O: 18JUL2018 11:28:03  19.4N  155.3W Mw=5.3  EMSC   ISLAND OF HAWAII, HAWAII     

P: 15JUL2018 118135    19.3N  155.2W 3.0-4.6 BAAAA  Hawaii                     

 

An unusual earthquake of M 3.6 occurred in South Africa today. The last earthquake of M>=3.6 within about 200 km of this epicenter occurred on December 2, 2013 about 200 km northwest of today's epicenter and prior to that an M 4.6 on July 7, 2013. Forecast 118303 had expected today's event was likely in this area around July 16. This event is near the antipode of Hawaii and may have been promoted from that eruption.

 

O: 19JUL2018 01:34:40  26.0S   30.1E mb=3.6  EMSC   SOUTH AFRICA                 

P: 16JUL2018 118303    26.0S   28.0E 3.0-4.4 BABAA  Rep. South Africa          

 

At least two moderate earthquakes today may have been promoted by strong weather systems. The largest of these was an M 4.8 in Guam, an area which has been active in the past several days beginning with the passage of Super-typhoon Maria earlier this month as noted in previous issues of this summary:

 

"Super-Typhoon Maria (TS 10W) continued today over Guam with winds up to 150 kts. It is expected to track to the northwest passing over Guam as a typhoon on  July 5-6. This storm could trigger a moderate to large quake in the region of Guam and the southern Mariana Islands which are currently seeing seismicity at moderately high levels." (July 7-9, 2018)

 

NEIC reported this earthquake of M 4.8 in Guam was felt with intensity IV in Dededo, Guam and II-III in the area(s) of Guam at Yigo, Mangilao, Tamuning, Barrigada, Hagatna, Yona, Talofofo, Merizo and Santa Rita.

 

O: 18JUL2018 12:27:10  13.4N  144.4E mb=4.8  EMSC   GUAM REGION                  

P: 15JUL2018 118149    13.0N  144.0E 4.0-5.6 BAAAA  So. Marianas/Guam          

 

The quake in the northern Philippines occurred shortly after TS Son-Tinh passed over the epicenter as noted in previous issues of this summary:

 

"TS Son-tinh (TD 11W) continued today west of the northern Philippines with winds up to 45 kts.  This system is expected to move to the west over the next several days perhaps elevating seismicity in the Northern Philippines and/or Taiwan." (July 17, 2018)

 

O: 18JUL2018 10:35:20  20.2N  121.3E mb=4.5  EMSC   BATAN ISL REGION, PHILIPPINES

P: 19JUL2018 118164    20.0N  121.0E 4.0-5.6 AAAAA  Taiwan                      

 

SOUTHWEST PACIFIC CONTINUES ACTIVE

 

EARTHQUAKE SUMMARY FOR JULY 17, 2018

 

The strongest seismicity in the world today was an M 5.9 in the Santa Cruz Islands north of Vanuatu. It was not reported in this remote oceanic region. The last earthquake of M>=5.9 within about 150 km of this epicenter occurred exactly three years ago on July 18, 2015 with M 7.0. Forecast 118297 had expected this event within about 50 km of the epicenter was likely around July 18.

 

O: 17JUL2018 07:02:54  11.6S  166.4E Mw=5.9  EMSC   SANTA CRUZ ISLANDS           

P: 18JUL2018 118297    12.0S  166.0E 4.0-5.8 AAAAA  Vanuatu Islands            

 

An unusual earthquake of M 3.5 was recorded today in Northern Alaska. It was not reported felt in this remote area. The last earthquake with M>=3.5 within about 250 km of this epicenter occurred on  May 16, 2018 about 200 km southeast of today's epicenter with M 3.8. Prior to that an M 3.7 on August 29, 2017 and an M 4.5 on March 5, 2016 (and aftershocks of M 4.0 and 4.3) were the only such quakes in the past 2.5 years.

 

O: 18JUL2018 04:45:22  67.6N  159.7W Ml=3.5  EMSC   NORTHERN ALASKA              

 

An earthquake of M 4.3 was widely felt in the Dominican Republic today. NEIC reported this earthquake of M 4.3 in the Dominican Republic was felt with intensity IV in San Francisco de Macoris, Duarte, Dominican Republic and II-III in the area(s) of Cabrera, Rio San Juan and Santiago, Dominican Republic.  Other earthquakes of M>=4.3 in the Dominican Republic have occurred in 2018 on January 28 (M 4.4) and June 3 (M 4.7). Forecast 118151 had expected today's event within about 100 km of this epicenter was likely around July 19.

 

O: 18JUL2018 05:22:28  19.6N   69.9W mb=4.3  EMSC   DOMINICAN REPUBLIC           

P: 19JUL2018 118151    20.0N   71.0W 3.0-4.4 AAAAA  Bahamas/No. Caribbean      

 

An unusually large earthquake of M 5.0 also occurred today in Michoacan, Mexico. NEIC reported this earthquake of M 5.0 in Michoacan, Mexico was felt with intensity II-III in the area(s) of Colima, Suchit5lan, Manzanillo, Colima; in Jalisco at Zapotiltic, Guzman, Guadalajara, Puerto Vallarta and in Tinguindin, Michoacan and Mexico City, Mexico.  The last earthquake in Michoacan, Mexico with M>=5 occurred on February 20, 2013. An M 6.0 hit west of this in Colima on June 20, 2018. The only other such event in the past year in the region was an M 5.8 on February 9, 2018. Forecast 118142 had expected today's event was likely within about 100 km of this epicenter around July 17. This activity is at the seventh node (51 degrees) from the great Gulf of Alaska quake of January 23 and was probably promoted from that source.

 

O: 17JUL2018 09:39:38  18.2N  103.5W ML=4.1  EMSC   OFFSHORE MICHOACAN, MEXICO   

O: 17JUL2018 08:54:40  18.4N  103.3W Mw=5.0  EMSC   MICHOACAN, MEXICO             

P: 17JUL2018 118142    19.0N  104.0W 3.5-5.2 AAAAA  Michoacan, Mexico          

 

MODERATELY STRONG BALLENY ISLANDS QUAKE

 

EARTHQUAKE SUMMARY FOR JULY 16, 2018

 

An earthquake of M 5.8 occurred today in the Balleny Islands region south  of Australia and New Zealand. It was not reported felt in this remote area. The last earthquake f equal or larger magnitude in the area was an M 6.2 on October 8, 2017. Earthquakes of M 5.1 and 5.2 also occurred in the area on January 23 and April 6, 2018. The tectonics of the area do not easily produce tsunami waves. This epicenter is located at the fourth node (90.0 degrees) from Hawaii and was probably promoted from that source.

 

O: 16JUL2018 15:18:37  61.4S  155.2E Mw=5.8  EMSC   BALLENY ISLANDS REGION       

 

 

The strongest earthquake in the U.S. today was an M 5.3 associated with a strong eruption of Kilauea. NEIC reported it was felt with intensity I in Kapaau and IV in Volcano, and III in Pepeekeo and Kaunakakai,  Hawaii. Many lesser quakes were also felt lightly in the region of Volcano, Hawaii. Forecast 118135 had expected this activity around July 15.

 

O: 16JUL2018 21:42:35  19.4N  155.3W mw=5.3  ANSS   SW of Volcano Hawaii

O: 16JUL2018 21:42:09  19.4N  155.3W ML=4.7  EMSC   ISLAND OF HAWAII, HAWAII     

P: 15JUL2018 118135    19.3N  155.2W 3.0-4.6 AAAAA  Hawaii                     

 

STRONG QUAKE IN GULF OF ADEN CONTINUES REGIONAL SWARM

 

EARTHQUAKE SUMMARY FOR JULY 15, 2018

 

The strongest earthquake in the world today was an M 5.9-6.0 in the Gulf of  Aden. NEIC reported it was felt with intensity V in Yemen at Hadramaut and Aden, Yemen. This summary had noted this activity in the previous issue as:

 

"The strongest seismicity in the world today occurred in the Gulf of Aden off the coast of Yemen. This included an M 5.4 event which was felt with intensity IV in Hadramaut, Yemen. Recent activity in the area suggests continuing moderate to large quakes are likely in the next several days. The last earthquake in the Gulf of Aden within about 300 km of this epicenter with M>=5.4 occurred on August 17, 2015 with M 5.6. The last of M>=6 was an M 6.6 on December 30, 2006 south of today's epicenter. Forecast 118134 had expected today's activity to the east in the Gulf of Aden around July 16." (July 15, 2018)

 

This activity is located at 108 degrees from the great M 8.0 Gulf of Alaska

quake of January 23, 2018 and may have been promoted from that source.

 

O: 15JUL2018 12:59:12  13.8N   51.7E mb=4.4  EMSC   GULF OF ADEN                 

O: 15JUL2018 13:09:16  13.9N   51.7E Mw=5.9  EMSC   GULF OF ADEN                 

O: 15JUL2018 13:09:16  13.8N   51.7E mw=6.0  ANSS   SSE of Sayhut Yemen

P: 16JUL2018 118134    14.0N   54.0E 3.5-5.3 AACAA  Gulf of Aden               

 

The current earthquakes in the region of Galapagos today continued with an M 4.7 and smaller events. This, like the activity in Hawaii is probably related to volcanism at this hot spot, and joins other such areas, like Iceland, and  the southwest Indian Ridge where this type of activity is occurring. The strongest

in the current swarm was an M 5.5 on June 26, 2018. Forecast 117912 had expected this regional activity in mid-July. This activity is at the fifth node from the Gulf of Alaska, a distance at which some seismic promotion is likely.

 

O: 16JUL2018 03:31:02   0.7S   91.2W ML=4.1  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 15JUL2018 13:35:03   0.8S   91.1W ML=4.1  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 16JUL2018 01:51:22   0.8S   91.1W ML=4.7  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 15JUL2018 11:24:29   0.8S   91.2W ML=3.4  EMSC   GALAPAGOS ISLANDS, ECUADOR   

P: 10JUL2018 117912     2.0N   85.0W 4.0-5.6 BCCAA  So. of Panama              

 

An M 3.0 in the region of San Francisco, California today was widely felt. NEIC reported it was felt with intensity II-III in San Leandro, Hayward, San Lorenzo, Castro Valley, Oakland, and in general within about 100 km of the epicenter. This is the largest event near San Francisco since an M 3.2 on June 22, 2018 and prior to that an M 3.0 on May 30, 2018. Ten such events have hit the area within about 50 km of this epicenter during 2018. The largest was an M 4.4 on January 4, 2018. Forecast 118173 had expected this activity was likely within about 15 km of the epicenter around July 16.

 

O: 15JUL2018 18:52:57  37.7N  122.1W ML=3.0  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 16JUL2018 118173    37.7N  121.9W 2.5-4.6 AAAAA  Central California         

 

The strongest earthquake in the U.S. today was an M 5.2 associated with a strong eruption of Kilauea. NEIC reported it was felt with intensity V in Kapaau and II-III in Volcano, Hilo, Paauilo and Kealakekua, Hawaii. Many lesser quakes were also felt lightly in the region of Volcano, Hawaii. Forecast 118135 had expected this activity around July 15.

 

O: 15JUL2018 13:26:05  19.4N  155.3W mw=5.2  ANSS   WSW of Volcano Hawaii        

O: 15JUL2018 13:26:03  19.4N  155.3W Mw=5.0  EMSC   ISLAND OF HAWAII, HAWAII     

P: 15JUL2018 118135    19.3N  155.2W 3.0-4.6 AAAAA  Hawaii                     

 

The strongest earthquake in the U.S. or Canada outside Hawaii was an M 3.7 in the Fox Islands, Aleutians, continuing activity in that region. It was not felt in this remote area. The last event within about 150 km of this epicenter in the

Fox Islands with M>=3.7 occurred on July 13 with M 3.9. Six such events have occurred in this area in the past month, the largest of which was an M 4.3 on July 11. Forecast 118254 had expected this activity was likely in mid-July.

 

O: 15JUL2018 08:16:09  52.7N  168.2W ML=3.7  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 19JUL2018 118254    52.1N  171.3W 3.5-5.1 BABAA  Andreanoff Isls, Aleutians 

 

After a short quiet interval, the swarm of light to moderate quakes near Broken Bow, Nebraska continued today with an M 2.8.  NEIC reported this earthquake of M 2.8 in Nebraska was felt with intensity II-III in the area(s) of Arnold, Stapleton and Oshkosh, Nebraska.  The activity in Nebraska is at the seventh node from Hawaii (51-52 degrees) and is likely to have been promoted from that area.

 

O: 16JUL2018 01:00:07  41.3N  100.1W mb=2.8  EMSC   NEBRASKA                     

 

MODERATELY STRONG QUAKE IN GULF OF ADEN

 

EARTHQUAKE SUMMARY FOR JULY 14, 2018

 

The strongest seismicity in the world today occurred in the Gulf of Aden off

the coast of Yemen. This included an M 5.4 event which was felt with intensity IV in Hadramaut, Yemen. Recent activity in the area suggests continuing moderate to large quakes are likely in the next several days. The last earthquake in the Gulf of Aden within about 300 km of this epicenter with M>=5.4 occurred on August 17, 2015 with M 5.6. The last of M>=6 was an M 6.6 on December 30, 2006 south of today's epicenter. Forecast 118134 had expected today's activity to the east in the Gulf of Aden around July 16.

 

O: 15JUL2018 01:57:19  14.0N   51.7E Mw=6.0  EMSC   GULF OF ADEN                 

O: 15JUL2018 01:57:19  14.1N   51.7E mb=5.4  ANSS   SSE of Sayhut Yemen

P: 16JUL2018 118134    14.0N   54.0E 3.5-5.3 AACAA  Gulf of Aden               

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in northern Alaska. NEIC reported this earthquake of M 3.9 in Central Alaska was felt with intensity II-III in the area(s) of Fairbanks and North Pole, Alaska.  This is the strongest earthquake in Northern Alaska within about 150 km of this epicenter since an M 4.8 on October 23, 2014. An M 4.4 hit about 200 km northeast of this on May 11, 2018.  Forecast 118274 had expected activity in the area was likely around July 18.

 

O: 14JUL2018 16:12:04  65.8N  147.8W ML=3.9  EMSC   NORTHERN ALASKA              

P: 18JUL2018 118274    63.1N  144.7W 3.2-5.0 BCBAA  Central Alaska             

 

STRONG QUAKE IN SOUTHERN VANUATU MAY BRING RENEWED SEISMICITY

 

EARTHQUAKE SUMMARY FOR JULY 13, 2018

 

For the most part, global seismicity was up today. Moderate aftershocks occurred in most areas which have recently been active including the Gulf of Alaska (M 4.7); the Galapagos (M 4.6); the South Sandwich Islands (M 4.9) and Hawaii (M 4.4, 5.3).  The strongest earthquake in the world today was an M 6.4 in Southern Vanuatu. NEIC reported it was felt with intensity III in Vanuatu at Isangel and Vila. Previous issues of this report had noted the activity in Vanuatu as:

 

"The strongest earthquake of the day, however was an M 5.5 in southern Vanuatu, a region which has been active in the past several days including an M 5.5 in New Caledonia yesterday. Forecast 118073 expected today's event in Vanuatu was likely within about 100 km around July 6.  NEIC reported this earthquake of M 5.5 in Vanuatu was felt with intensity II-III in the area(s) of Vila, Shefa, Vanuatu.  It is located at the seventh node (51 degrees) from Hawaii and was probably promoted from that source." (July 9, 2018)

 

This is the strongest earthquake in the world in more than two months – since the M 6.9 in Hawaii associated with the volcanism there on May 4, 2018. While the eruption in Hawaii continues to hold off larger strong earthquakes this will not continue indefinitely and today's event in Vanuatu may represent a turning point in the current quiet period. It is also the largest quake in southern Vanuatu since an M 6.4 on September 20, 2017. Forecast 118297 had  expected today's event within about 100 km in mid-July. It is located at the seventh node (51 degrees) from Hawaii and was probably promoted from that source.

 

O: 13JUL2018 09:46:48  18.9S  169.1E Mw=6.4  EMSC   VANUATU                       

P: 16JUL2018 118297    19.0S  168.0E 4.0-5.6 BAAAA  Vanuatu Islands            

 

An earthquake of M 5.3 was associated with a strong eruption of Kilauea Volcano, Hawaii today. NEIC reported it was felt with intensity IV in Hilo, Kurtistown, Volcano, and II-III in Pepeeleo, Honomu and Papaaloa, Hawaii.

Many other smaller events were also lightly felt in the Volcano area today as well. Forecast 118135 expected this activity in mid-July.

 

O: 14JUL2018 05:08:03  19.4N  155.3W Mw=5.3  EMSC   ISLAND OF HAWAII, HAWAII     

P: 15JUL2018 118135    19.3N  155.2W 3.0-4.6 AAAAA  Hawaii                     

 

Alaska saw a pair of moderate earthquakes today. The strongest was an M 4.7 in  the aftershock area of the M 8.0 there in late January, 2018. Today's event was not reported in this remote area but was felt outside the region. It is the strongest aftershock in this zone since an M  4.8 on June 17 and prior to that an M 5.5 on May 8, 2018. Forecast 118252 had expected this activity within about 50 km of this epicenter was likely in mid-July.

 

NEIC reported this earthquake of M 4.7 in the Gulf or Alaska was felt with intensity V in the area(s) of Homer, Alaska.

 

 

O: 13JUL2018 22:30:47  55.3N  149.0W ML=3.7  EMSC   GULF OF ALASKA

O: 13JUL2018 22:07:31  55.4N  149.1W ML=3.1  EMSC   GULF OF ALASKA

O: 13JUL2018 10:08:14  56.5N  149.2W ML=3.3  EMSC   GULF OF ALASKA

O: 13JUL2018 21:32:56  56.2N  149.4W mb=4.7  EMSC   GULF OF ALASKA               

P: 17JUL2018 118252    55.0N  148.7W 3.5-4.9 BBAAA  Gulf of Alaska              

 

An M 4.6 in the Kenai Peninsula of Alaska, however was the most widely felt quake in the U.S. today. The area of southern Alaska has been active in the past week and this appears to continue that trend.  NEIC reported this earthquake of M 4.6 in Southern Alaska was felt with intensity IV in the area of Homer, Alaska and in the area(s) of Anchor Point and Soldotna, Alaska. This is the largest quake within about 200 km of this epicenter in the Kenai Peninsula since an M 5.1 on March 9, 2018 and prior to that an M 5.1 on November 5, 2017. The last of larger magnitude within about 100 km was an M 6.2 on May 7m 2017. Forecast 118271 had expected this event within about 100 km of the epicenter in mid-July.

 

 

O: 13JUL2018 18:54:34  59.3N  151.2W Mw=4.6  EMSC   KENAI PENINSULA, ALASKA      

P: 16JUL2018 118271    60.1N  150.6W 3.2-5.5 BAAAA  Central Alaska             

 

An unusual swarm in southern Idaho today began with several small foreshocks which were followed by larger events including an M 3.5 an hour later. NEIC reported this earthquake of M 3.2 in Idaho was felt with intensity II-III in the area(s) of Stanley, Idaho and possibly in Salt Lake City, Utah. This may have been encouraged by strong tidal stresses as it occurred with the new moon near local solar noon when such stresses are maximized. The last earthquake within about 100 km of this epicenter occurred on May 3, 2014 with M 3.8. Most of

the regional seismicity at these magnitude levels is aftershocks in the Challis/Borah Peak area of Idaho about 100 km to the northeast of today's epicenter.   Forecast 118227 had expected this activity was likely to the east around July 15. This activity is located at 103 degrees from the M 7.6 in Papua New Guinea of late February and was probably promoted from that source.

 

O: 13JUL2018 18:18:37  44.3N  114.9W ML=2.1  EMSC   SOUTHERN IDAHO

O: 13JUL2018 18:57:46  44.3N  115.0W ML=2.0  EMSC   SOUTHERN IDAHO

O: 13JUL2018 17:10:06  44.3N  115.0W ML=2.1  EMSC   SOUTHERN IDAHO

O: 13JUL2018 18:15:25  44.3N  115.0W ML=2.4  EMSC   SOUTHERN IDAHO

O: 13JUL2018 18:17:01  44.3N  115.0W ML=2.4  EMSC   SOUTHERN IDAHO

O: 13JUL2018 17:12:03  44.3N  115.0W ML=2.5  EMSC   SOUTHERN IDAHO

O: 13JUL2018 18:32:18  44.3N  115.0W ML=2.5  EMSC   SOUTHERN IDAHO

O: 13JUL2018 17:24:55  44.3N  115.0W ML=2.7  EMSC   SOUTHERN IDAHO

O: 13JUL2018 18:07:45  44.3N  115.0W ML=2.7  EMSC   SOUTHERN IDAHO

O: 13JUL2018 18:04:55  44.3N  115.0W ML=3.5  EMSC   SOUTHERN IDAHO               

P: 15JUL2018 118227    44.5N  114.2W 2.0-4.0 AAAAA  Montana/Idaho              

 

 

 

SOUTHWEST PACIFIC ACTIVE

 

EARTHQUAKE SUMMARY FOR JULY 12, 2018

 

The strongest earthquakes of the day today occurred in the Fiji Islands (M 5.5) and in Tonga (M 5.2). This area from Vanuatu east to Tonga and Fiji has been active in the past week. It is remote and these earthquakes were not reported felt in this area. Forecast 118079 had expected this activity in early July.

 

O: 13JUL2018 03:13:33  21.6S  174.4W mb=5.2  EMSC   TONGA                        

P:  6JUL2018 118079    20.0S  175.0W 4.0-5.6 CBAAA  Tonga Islands              

 

O: 12JUL2018 06:51:20  23.4S  179.9W Mw=5.5  EMSC   SOUTH OF FIJI ISLANDS        

P:  7JUL2018 118080    25.0S  179.0W 4.0-5.6 BBAAA  Tonga Islands              

P:  8JUL2018 118079    24.0S  176.0W 4.0-5.9 BACAA  Tonga Islands              

 

An earthquake of M 5.3 was associated with a strong eruption of Kilauea Volcano, Hawaii today. NEIC reported it was felt with intensity II-III in Hilo, Naalehu, Volcano, Pepeeleo and Kaunakakai, Hawaii. Many other smaller events were also lightly felt in the Volcano area today as well. Forecast 117953 expected this activity around July 9.

 

O: 13JUL2018 00:42:27  19.4N  155.3W Mw=5.3  EMSC   ISLAND OF HAWAII, HAWAII     

P:  9JUL2018 117953    19.4N  155.3W 4.0-5.7 BAAAA  Hawaii area                

 

A light earthquake of M 2.9 in the Los Angeles, California area occurred today.

It was felt in the area of Buena Park, La Palma, Cypress, Stanton, Anaheim, Fullerton, La Mirada and Cerritos among other communities. While this may be of no regional significance in regional seismicity, the depth of 19 km is concerning as most moderate or large earthquakes begin at this depth near the brittle-viscous transition zone in the area. The location is also of concern as it may be part of a pattern in recent days matching what may be expected prior to a large regional event. The area has such events about 22-24 years apart. The last was the Northridge quake in January, 1994 and prior to that the San Fernando quake of February 1971 so another such is due. While these generally occur in winter, some such as the Landers quake of June, 1992 have occurred in summer months. The last earthquake of M>=2.9 in Central Los Angeles within about 50 km of this epicenter occurred as an M 3.1 on November 10, 2017. An M 3.6 occurred on July 10, 2018 about 50 km to the east of today's epicenter and may have helped promote today's earthquake. Forecast 117991 had expected this event within about 25 km around July 6.

 

O: 12JUL2018 20:24:51  33.9N  118.0W ML=2.9  EMSC   GREATER LOS ANGELES AREA, CALI

P:  6JUL2018 117991    33.9N  118.3W 2.5-4.7 CAAAA  So. California             

 

The strongest earthquakes in the U.S. or Canada today continued in Alaska with M 4.0. These occurred in the Rat Islands and off the coast of Southeastern Alaska. This later event was the largest since an M 4.0 on September 21, 2017 and a similar event on August 18, 2017. The last of larger magnitude was an M 5.8 on January 16, 2017. Forecast 118051 had expected this event was likely around July 10.

 

O: 12JUL2018 13:14:34  52.0N  178.5E mb=4.0  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  7JUL2018 118048    51.0N  178.0E 4.0-5.8 BAAAA  Rat Islands                

 

O: 12JUL2018 18:07:18  57.4N  138.0W ML=3.8  EMSC   OFF COAST OF SOUTHEASTERN ALAS

O: 12JUL2018 18:07:17  57.5N  137.9W ML=4.0  NRCA  164 km W   of Sitka

P: 10JUL2018 118051    57.9N  139.0W 3.0-4.4 AAAAA  Southeast Alaska           

MODERATE QUAKES SHAKE VOLCANO ISLANDS - RELATED TO TYPHOON MARIA

 

EARTHQUAKE SUMMARY FOR JULY 11, 2018

 

Two moderate earthquakes of M 5.0 and 5.1 occurred in the Volcano Islands near Iwo Jima, Japan today. They were not reported felt but illustrate the relation between strong weather systems and subsequent seismicity. In this summary in previous issues the Volcano Islands had been emphasized as a possible site of enhanced seismicity with the passage of Super-Typhoon Maria as:

 

"Super-Typhoon Maria (TS 10W) continued today over Guam with winds up to 150 kts. It is expected to track to the northwest passing over Guam as a typhoon on

July 5-6. This storm could trigger a moderate to large quake in the region of Guam and the southern Mariana Islands which are currently seeing seismicity at moderately high levels." (July 7-9, 2018)

 

The last earthquake in the Volcano Islands with M>=5.1 occurred on April 15, 2018 also with M 5.1. The last of larger magnitude was an M 5.7 on September 11, 2017. Forecast 117963 had expected today's activity was likely within about 100 km of these epicenters in the Volcano Islands around July 9.

 

O: 12JUL2018 00:38:01  23.5N  143.8E mb=5.1  EMSC   VOLCANO ISLANDS, JAPAN REGION

O: 12JUL2018 03:09:24  23.6N  143.8E mb=5.0  EMSC   VOLCANO ISLANDS, JAPAN REGION

P:  9JUL2018 117963    24.0N  143.0E 4.0-5.6 AAAAA  Volcano Islands            

 

An earthquake of M 5.3 was associated with a strong eruption of Kilauea Volcano, Hawaii today. NEIC reported it was felt with intensity IV in Volcano and II-III in Hilo, Naalehu and Kailua Kona, Hawaii. Many other smaller events were also lightly felt in the Volcano area today as well. Forecast 117953 expected this activity around July 9.

 

O: 11JUL2018 15:45:53  19.4N  155.3W Mw=5.3  EMSC   ISLAND OF HAWAII, HAWAII     

P:  9JUL2018 117953    19.4N  155.3W 4.0-5.7 AAAAA  Hawaii area                

 

The strongest earthquake in the U.S. or Canada outside Hawaii today was an M 4.3 in the Fox Islands, Aleutians, Alaska continuing an upswing in seismicity in the Aleutians over the past week. It was not felt in this remote epicentral area. The last earthquake in the western Fox Islands within about 150 km of this epicenter with M>=4.3 was an M 4.6 on May 18, 2018. Forecast 118041 had expected today's epicenter to be active around July 8.

 

O: 11JUL2018 23:57:01  53.2N  169.2W mb=4.3  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  8JUL2018 118041    52.5N  169.2W 3.5-4.9 BAAAA  Fox Islands, Aleutians     

 

STRONG SERIES IN SOUTHWEST INDIAN RIDGE CONTINUES

 

EARTHQUAKE SUMMARY FOR JULY 10, 2018

 

A strong series of earthquakes southeast of Madagascar in the Southwest Indian Ridge continued and was enhanced today. The largest of these events today were M 5.5-6.0. None of these were reported felt in this remote area but as this summary noted in the previous issue may become associated with the antipodal region of Southern and Baja California as:

 

 

"A series of moderate earthquakes in the South Indian Ridge of M 4.7-5.1 today  may precede seismic activation of Southern California. These two areas are antipodal to each other and often become active together. The exact antipode of these epicenter in the Southwest Indian Ridge is 32N 122W off the coast of Baja

California but antipodal effects are not limited to the exact antipode but can affect nearby areas such as Baja and Southern California especially if this series is enhanced with larger magnitudes in coming days. The last earthquake within about 200 km of the Indian Ridge events with M>=5.1 occurred on July 12, 2016 with M 5.4. Forecast 118086 had expected this activity within about 100 km was likely around July 7. This activity is located at 103 degrees from the M 6.8 in Bolivia of April 2 and may have been promoted from that source." (July 10, 2018)

 

The activity in Hawaii is at 99 degrees from Bolivia as well. Both regions are volcanic and the new activity in the Indian Ridge may reflect volcanism in the area.

 

The last earthquake within about 100 km of this epicenter in the Indian Ridge with M>=5.6 was an event of M 5.9 on January 12, 2016 and prior to that on M 5.8 on August 24, 2013 and M 5.6 on March 12, 2006. These are the only such events in the area since 1990.  Forecast 118086 expected this earthquake was likely around July 7. This activity is at 147 degrees from Hawaii, a distance at which strong triggering is often seen.

 

O: 10JUL2018 08:15:25  31.3S   58.2E mb=5.0  EMSC   SOUTHWEST INDIAN RIDGE

O: 10JUL2018 07:26:58  31.6S   58.0E mb=5.1  EMSC   SOUTHWEST INDIAN RIDGE

O: 10JUL2018 16:05:09  31.6S   58.2E Mw=5.5  EMSC   SOUTHWEST INDIAN RIDGE

O: 10JUL2018 12:04:07  31.6S   58.2E mb=4.9  EMSC   SOUTHWEST INDIAN RIDGE

O: 10JUL2018 14:35:26  31.6S   58.2E mb=4.9  EMSC   SOUTHWEST INDIAN RIDGE

O: 11JUL2018 03:07:15  31.6S   58.2E mb=5.1  EMSC   SOUTHWEST INDIAN RIDGE

O: 10JUL2018 11:30:07  31.6S   58.3E mb=4.9  EMSC   SOUTHWEST INDIAN RIDGE

O: 10JUL2018 17:45:01  31.7S   58.1E mb=4.7  EMSC   SOUTHWEST INDIAN RIDGE

O: 10JUL2018 13:07:12  31.7S   58.2E mb=4.8  EMSC   SOUTHWEST INDIAN RIDGE

O: 11JUL2018 02:22:21  31.7S   58.2E mb=4.9  EMSC   SOUTHWEST INDIAN RIDGE

O: 10JUL2018 08:44:14  31.7S   58.2E mb=5.2  EMSC   SOUTHWEST INDIAN RIDGE

O: 11JUL2018 00:33:40  31.7S   58.2E mb=5.2  EMSC   SOUTHWEST INDIAN RIDGE

O: 11JUL2018 05:00:42  31.7S   58.2E mb=5.3  EMSC   SOUTHWEST INDIAN RIDGE

O: 10JUL2018 10:26:21  31.7S   58.3E Mw=5.6  EMSC   SOUTHWEST INDIAN RIDGE

O: 10JUL2018 18:41:37  31.7S   58.3E mb=4.9  EMSC   SOUTHWEST INDIAN RIDGE

O: 10JUL2018 23:28:00  31.7S   58.3E mb=5.2  EMSC   SOUTHWEST INDIAN RIDGE       

P:  7JUL2018 118086    32.0S   59.0E 4.0-5.8 BAAAA  So. Indian Ocean           

 

 

A light earthquake of M 3.6 in the eastern Los Angeles, California area today was followed by an M 2.5 aftershock. These events were both widely felt in  the epicentral area but no major damage was reported.  NEIC reported this earthquake of M 2.5 in the Los Angeles, California area was felt with intensity IV in Ontario, California and II-III in the area(s) of Chino, Rancho Cucamonga, Norco, Corona and Fontana, California.  The M 3.6 is the strongest event within about 50 km of this epicenter since an M 4.0 on January 25, 2018 and prior to that an M 3.6 on March 14, 2017. The only other such  event in the past three years (since 2015) in the area was  an M 3.7 on October 8, 2016. Forecast 117992 had expected this event within this area was likely around July 9. This earthquake is located at 102 degrees from the M 7.6 in Papua New Guinea of February 25 and may have been promoted from that source.

 

O: 10JUL2018 12:33:03  34.0N  117.6W ML=2.5  EMSC   GREATER LOS ANGELES AREA, CALI

O: 10JUL2018 11:08:37  34.0N  117.6W ML=3.6  EMSC   GREATER LOS ANGELES AREA, CALI

P:  9JUL2018 117992    34.3N  117.5W 2.5-4.5 AAAAA  So. California              

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in the Near Islands, Aleutians. This is near the most west point in the U.S. but was not reported felt in  this area. The last earthquake in the Near Islands with M>=4.6 occurred on May 9, 2018 (M 4.9) and prior to that on August 8, 2017 (M 5.1). Forecast 118043 had expected today's event within about 100 km of the epicenter was likely around July 10.

 

O: 10JUL2018 15:54:24  53.4N  172.8E mb=4.6  EMSC   NEAR ISLANDS, ALEUTIAN ISLANDS

P: 10JUL2018 118043    53.0N  170.0E 4.0-5.6 AABAA  Near Islands               

 

 

EARTHQUAKES IN SOUTH INDIAN RIDGE MAY PRECEDE INCREASE IN SO. CALIFORNIA

 

EARTHQUAKE SUMMARY FOR JULY 9, 2018

 

A series of moderate earthquakes in the South Indian Ridge of M 4.7-5.1 today

may precede seismic activation of Southern California. These two areas are antipodal to each other and often become active together. The exact antipode of these epicenter in the Southwest Indian Ridge is 32N 122W off the coast of Baja California but antipodal effects are not limited to the exact antipode but can affect nearby areas such as Baja and Southern California especially if this series is enhanced with larger magnitudes in coming days. The last earthquake within about 200 km of the Indian Ridge events with M>=5.1 occurred on July 12, 2016 with M 5.4. Forecast 118086 had expected this activity within about 100 km was likely around July 7. This activity is located at 103 degrees from the M 6.8 in Bolivia of April 2 and may have been promoted from that source.

 

O: 10JUL2018 05:04:22  31.6S   57.7E mb=4.7  EMSC   SOUTHWEST INDIAN RIDGE       

O: 10JUL2018 05:33:30  31.8S   58.1E mb=4.8  EMSC   SOUTHWEST INDIAN RIDGE       

O: 10JUL2018 07:26:57  31.8S   58.1E mb=5.1  EMSC   SOUTHWEST INDIAN RIDGE       

P:  7JUL2018 118086    32.0S   59.0E 4.0-5.8 BAAAA  So. Indian Ocean           

 

A moderate earthquake occurred with M 5.0 in Central Alaska today. NEIC reported

it was felt with intensity IV in Matanuska-Sustina Border and II-III in Denali National Park, Talkeetna, Healy, Willow, SkwentnaWasilla, Chugiak, Elmendorf AFB, and Palmer, Alaska among other communities. The last earthquake of M>=5 within about 100 km of this epicenter occurred on July 1, 2018 also with M 5.0. The last of larger magnitude was an M 5.2 on April 29, 2017. Forecast 118055 had expected this event within this region was likely around July 8.

 

O: 10JUL2018 01:08:20  63.0N  150.6W mb=5.0  EMSC   CENTRAL ALASKA               

P:  8JUL2018 118055    62.6N  151.4W 3.2-5.3 AAAAA  Central Alaska             

 

An M 3.1 east of San Francisco, California today was reported felt with intensity II-III in Central California at Morgan Hill, San Martin, Gilroy, San Juan Bautista, San Jose, Soquel, Sunnyvale, Mountain View, Santa Cruz and Pacific Grove, California. The last earthquake of M>=3.1 within about 40 km of this epicenter was an M May 15, 2018 (M 3.2) and prior to that March 11, 2018 (M 3.4). Forecast 117969 had expected activity in this area around June 6.

 

O: 10JUL2018 00:00:07  37.1N  121.5W ML=3.1  EMSC   NORTHERN CALIFORNIA          

O: 10JUL2018 06:41:16  37.2N  121.5W MD=2.2  EMSC   NORTHERN CALIFORNIA          

P:  6JUL2018 117969    37.8N  122.6W 2.5-4.4 BAAAA  Central California         

 

An earthquake of M 5.3 was associated with a strong eruption of Kilauea, Hawaii today. NEIC reported it was felt with intensity II-III in Hawaii National Park, Volcano, Mountain View, Hilo, Pepeekeo and Honomu, Hawaii.  A number of other smaller earthquakes were also felt in Hawaii near Volcano.

 

O:  9JUL2018 19:20:46  19.4N  155.3W Mw=5.3  EMSC   ISLAND OF HAWAII, HAWAII     

P:  9JUL2018 117953    19.4N  155.3W 4.0-5.7 AAAAA  Hawaii area                

 

An unusual earthquake of M 4.1 occurred in the North Atlantic east of Massachusetts today. This event may be related to stress redistribution associated with Hurricane Chris currently located south of this epicenter.

 

O:  9JUL2018 07:16:47  43.3N   55.9W ML=4.1  NRCA  Atlantic Ocean.               

 

Moderate earthquakes also occurred today in the region of Guam (M 4.2) and in  the Northern Mariana Islands (M 4.8). These were probably promoted by the passage of Super-Typhoon Maria as previous noted in this summary:

 

 

"Super-Typhoon Maria (TS 10W) continued today over Guam with winds up to 150 kts. It is expected to track to the northwest passing over Guam as a typhoon on

July 5-6. This storm could trigger a moderate to large quake in the region of Guam and the southern Mariana Islands which are currently seeing seismicity at moderately high levels." (July 7, 2018)

 

Forecast 117949 had expected the event in Guam was likely within about 50 km  around July 6 whereas the M 4,8 in the Northern Mariana Islands was expected within about 50 km around July 6 as well.

 

NEIC reported this earthquake of M 4.2 in Guam was felt with intensity II-III in the area(s) of Tamuning, Guam.

 

O:  9JUL2018 08:31:22  13.5N  145.0E mb=4.2  EMSC   GUAM REGION                  

P:  6JUL2018 117949    14.0N  145.0E 4.0-5.4 BAAAA  So. Marianas/Guam          

 

O:  9JUL2018 21:41:19  18.2N  145.5E mb=4.8  EMSC   PAGAN REG., N. MARIANA ISLANDS

P:  6JUL2018 117945    18.0N  146.0E 4.0-5.5 BAAAA  No. Marianas               

 

MODERATE QUAKES IN HAWAII AND ALASKA

 

EARTHQUAKE SUMMARY FOR JULY 8, 2018

 

Moderate earthquakes hit in Hawaii (M 5.4) and in the Aleutian Islands of Alaska (M 5.2, 4.6) today. The strongest earthquake of the day, however was an M 5.5 in southern Vanuatu, a region which has been active in the past several days including an M 5.5 in New Caledonia yesterday. Forecast 118073 expected today's event in Vanuatu was likely within about 100 km around July 6.  NEIC reported this earthquake of M 5.5 in Vanuatu was felt with intensity II-III in the area(s) of Vila, Shefa, Vanuatu. It is located at the seventh node (51 degrees) from Hawaii and was probably promoted from that source.

 

O:  8JUL2018 21:04:36  19.0S  169.5E Mw=5.5  EMSC   VANUATU                      

P:  6JUL2018 118073    20.0S  169.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 5.4 associated with a strong eruption at Kilauea, Hawaii. It was reported by NEIC to have been felt with intensity II-III in Volcano, Keaau, Pepeekeo, and Kaunakakai, Hawaii. Many smaller events were also felt lightly in the Volcano, Hawaii area. This is one of the strongest daily eruptions in Hawaii since early May and was associated with a number of light earthquakes felt in the Volcano area of Hawaii.

 

O:  8JUL2018 12:54:50  19.4N  155.3W Mw=5.4  EMSC   ISLAND OF HAWAII, HAWAII     

P:  9JUL2018 117953    19.4N  155.3W 4.0-5.7 AAAAA  Hawaii area                

 

The strongest earthquake outside Hawaii in the U.S. or Canada today was an M 5.2 in the eastern Andreanof Islands, Aleutians. It was joined by an M 4.6 in the Fox Islands, Aleutians. This is part of an enhanced period of seismicity in Alaska over the past week and this is expected to continue for several more days. The earthquake of M 5.2 in the eastern Andreanof Islands breaks a long quiet for that region. The last earthquake of M>=5.2 within this region of the eastern Andreanof Islands occurred more than a year ago on June 17, 2017. Strong quakes hit the region with M 6+ in March 2016. Forecast 118038 had expected

today's unfelt event was likely around July 6.

 

O:  9JUL2018 02:42:28  51.5N  174.7W mb=5.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  6JUL2018 118038    51.7N  174.3W 3.5-4.9 BAAAA  Andreanoff Isls, Aleutians 

 

The last earthquake in the Fox Islands within about 150 km of today's epicenter with M>=4.6 was an M 4.6 on May 18, 2018. The last of greater magnitude was an  M 4.9 on December 10, 2017. A strong M 5.9 hit the area on May 24, 2017. Forecast 118041 had expected today's event in this area was likely around July 10.

 

O:  9JUL2018 03:16:09  52.6N  166.5W mb=4.6  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 10JUL2018 118041    51.8N  166.4W 3.5-4.9 AAAAA  Fox Islands, Aleutians     

 

STRONG EARTHQUAKE FELT NEAR TOKYO, JAPAN

 

EARTHQUAKE SUMMARY FOR JULY 7, 2018

 

A strong earthquake of M 5.9-6.0 was widely felt in Honshu, Japan near Tokyo today. As Typhoon Prapiroon is the first typhoon of the season to settle over Honshu, residual stresses unrelieved in months placed on the area by Typhoon Prapiroon as reported and expected in previous summaries probably helped trigger this quake:

 

"Typhoon Prapiroon (09W) continued today in the region over northern Honshu, Japan with winds up to 55 kts. It is expected to track to the north possibly affecting seismicity in Honshu, Japan as it set up over the island. This can lead to unloading conditions on the island which could help promote a strong regional earthquake in the next several days." (July 2-5, 2018)

 

Today's earthquake was widely felt with maximum intensity V-VI in Tokyo and Saitama Prefecture. Intensity IV was reported by NEIC from the Prefectures of Aichi, Yamanashi, Kanagawa, Chiba, with lesser II-III shaking in Ibaraki, Shizuoka, Gunma, Tochigi, Nagano, Miyagi, and Ishikawa Prefectures, Japan. No major damage was reported. The last earthquake in the region of Tokyo within about 100 km of this epicenter with M>=5.9 occurred as an M 6.2 about 100 km east of today's epicenter on September 23, 2016 (M 6.2) and prior to that an M 6.0 to the west on May 4, 2014. Forecast 117893 had expected a moderate regional event around July 10. This epicenter is located at the seventh node (51 degrees) from the great Alaska quake of January 23, 2018 (M 8.0) and was probably promoted from that source.

 

O:  7JUL2018 11:23:48  35.1N  140.6E Mw=5.8  EMSC   NEAR EAST COAST OF HONSHU, JAP

O: 07JUL2018 11:23:49  35.1N  140.7E mw=5.9  ANSS   SE of Ohara Japan

P: 10JUL2018 117983    35.0N  137.0E 3.5-4.9 BACAA  No. Honshu, Japan          

 

The earthquake in Honshu, Japan was followed later in the day by a similar event of M 5.9 in the Kermadec Islands of New Zealand. Together these suggest that the global seismic quiet which has persisted for more than two months is now over. These events may also have been promoted by an increase in solar activity including a C1.6 flare yesterday as noted in this summary:

 

 

"A solar flare (#6620) of C1.6 today was the strongest such event seen on the sun since a C2.7 on May 28, 2018. No major earthquakes were associated with this flare which is probably too small still for much SFE. Some areas particularly sensitive to changes in the geomagnetic field associated with strong solar flares are near the geomagnetic equator or along the western Pacific subduction zone." (July 7, 2018)

 

The Tonga-Kermadec arc is about 10 degrees south of the geomagnetic equator  in the western Pacific subduction zone and matches the parameters where a strong quake was possible at this time. The last earthquake in the Kermadec Islands of M>=6 was an M 6.2 on December 8, 2017 and prior to that an M 6.0 on June 28, 2017. Forecast 118087 had expected today's event within about 100 km of the epicenter was likely around July 7.

 

O:  7JUL2018 21:33:49  30.7S  177.9W Mw=6.0  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 07JUL2018 21:33:49  30.6S  178.0W mw=5.9  ANSS   L'Esperance Rock New Zealand

P:  7JUL2018 118087    31.0S  177.0W 4.0-5.7 AAAAA  So. Kermadec Islands       

 

A moderately strong M 5.5 earthquake also occurred today in the New Caledonia region west of the Loyalty Islands.  NEIC reported this earthquake of M 5.5 in New Caledonia was felt with intensity II-III in the area(s) of We and Noumea, New Caledonia.  The area of New Caledonia is near the Loyalty Islands which is highly seismic. The last earthquake of M>=5.5 in the region of New Caledonia within about 100 km of today's epicenter was an M 7.0 and aftershock of M 5.8 on November 19-20, 2017. Today's event may be the largest aftershock to date of that event. Forecast 118073 had expected this activity around July 6. More such events are likely in the area of southern Vanuatu and the Loyalty Islands in the next several days.

 

O:  8JUL2018 01:08:28  21.2S  168.5E Mw=5.5  EMSC   LOYALTY ISLANDS               

P:  6JUL2018 118073    20.0S  169.0E 4.0-5.4 ABAAA  Vanuatu Islands            

 

A moderate earthquake of M 4.8 occurred today as Super-typhoon Maria passed through the region of the central Mariana Islands. It was probably triggered by stresses related to this storm as noted in previous issues of this summary:

 

"Super-Typhoon Maria (TS 10W) continued today west of the northern Mariana Islands with winds up to 165 kts. This storm could trigger a moderate to large quake in the region of the northern Marianas Islands which are currently seeing seismicity at moderately high levels. It is expected to track to the west hitting the Chinese mainland around July 11 near Shanghai and north of Taiwan where seismicity is expected to be enhanced at that time." (July 7, 2018)

 

Forecast 117949 expected this activity around July 6.

 

O:  7JUL2018 17:48:08  15.7N  147.0E mb=4.8  EMSC   MARIANA ISLANDS REGION       

P:  6JUL2018 117949    14.0N  145.0E 4.0-5.4 ABBAA  So. Marianas/Guam          

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in Southern Alaska. The last event within about 150 km of this epicenter with M>=4 occurred on March 9, 2018 (M 5.1). Forecast 118054 had expected today's event within about 50 km to occur around July 7.

 

O:  7JUL2018 13:15:32  59.7N  153.8W ML=4.0  EMSC   SOUTHERN ALASKA              

P:  7JUL2018 118054    60.1N  153.4W 3.2-5.0 AAAAA  Central Alaska             

 

MODERATE QUAKE IN BISMARCK SEA MAY PRECEDE ENHANCED GLOBAL ACTIVITY

 

EARTHQUAKE SUMMARY FOR JULY 6, 2018

 

The earth was at quiet conditions with few noteable earthquakes today. The largest was an M 5.4 unfelt in the Bismarck Sea east of New Guinea. In the U.S. the strong eruption of Kilauea, Hawaii continued unabated with an eruption associated with an earthquake of M 5.2. An unusual earthquake also occurred as an M 2.8 in Alabama today. The event of M 5.4 in the Bismarck Sea was the strongest within about 200 km of that epicenter since an M 6.3 on January 26, 2018 and may be a regional aftershock of that event. Forecast 117922 had expected this event to the southeast was likely around July 6.

 

O:  6JUL2018 17:40:54   4.0S  146.8E Mw=5.4  EMSC   BISMARCK SEA                 

P:  6JUL2018 117922     7.0S  148.0E 4.0-5.6 ACAAA  New Ireland                

 

The strongest quake in the U.S. was an M 5.2-5.3 associated with the current strong eruption of Kilauea in Hawaii. NEIC reported it was felt with intensity IV in Volcano and Hawaii National Park and II-III in Pepeekeo, Hawaii.  Many other smaller events were also lightly felt in the region of Volcano, Hawaii.

 

O:  7JUL2018 04:04:38  19.4N  155.3W Mw=5.2  EMSC   ISLAND OF HAWAII, HAWAII     

P:  7JUL2018 117953    19.4N  155.3W 4.0-5.7 AAAAA  Hawaii area                

 

The most unusual earthquake in the U.S. or Canada today was an M 2.8 in Alabama. NEIC reported this earthquake of M 2.8 in Alabama was felt with intensity II-III in the area(s) of Alabama at Florence, Muscle Shoals and Tuscumbia and in Winchester, Tennessee. The last earthquake of M>=2 in Alabama occurred as an M 2.3 on April 21, 2018, but the last of M>=2.8 was an M 3.0 on April 29, 2016 and prior to that an M 2.8 on September 24, 2013. Forecast 117999 had expected regional seismicity in the southeast U.S. around July 6. This epicenter is located at the sixth node (60 degrees) from Hawaii and was probably promoted by energy from that area.

 

O:  6JUL2018 09:29:42  34.7N   87.7W MD=2.8  EMSC   ALABAMA                      

P:  6JUL2018 117999    34.0N   85.0W 2.0-4.4 AABAA  Southeast U.S.             

 

A solar flare (#6620) of C1.6 today was the strongest such event seen on the sun since a C2.7 on May 28, 2018. No major earthquakes were associated with this flare which is probably too small still for much SFE. Some areas particularly sensitive to changes in the geomagnetic field associated with strong solar flares are near the geomagnetic equator or along the western Pacific subduction zone. An earthquake in Japan continues to be a possibility as Typhoon Prapiroon in this area as noted in the previous issues:

 

 

"Typhoon Prapiroon (09W) continued today in the region over northern Honshu, Japan with winds up to 55 kts. It is expected to track to the north possibly affecting seismicity in Honshu, Japan as it set up over the island. This can lead to unloading conditions on the island which could help promote a strong regional earthquake in the next several days." (July 2-5, 2018)

 

A moderate quake in the Sea of Okhotsk of M 4.7 was probably promoted from stresses associated with Prapiroon. This may be a regional aftershock of the M 6.0 which hit about 300 km southwest of this on July 1. Forecast 118032 expected today's event within about 50 km was likely around July 9.

 

O:  7JUL2018 05:42:15  48.4N  146.3E mb=4.7  EMSC   SEA OF OKHOTSK               

P:  9JUL2018 118032    48.0N  147.0E 3.5-5.4 AAAAA  So. Kurils                 

 

STRONG EARTHQUAKE FELT IN KAMCHATKA, RUSSIA

 

EARTHQUAKE SUMMARY FOR JULY 5, 2018

 

As expected in this summary in previous issues, a strong earthquake of M 6.1 was promoted in Kamchatka as the eye of Typhoon Prapiroon moved through the area. This summary had noted this possibility in the previous issue as:

 

"Moderate earthquakes in and near Honshu, Japan continued today with an M 4.4 near the south coast of Honshu and an M 4.2 off the east coast of Honshu. ... These may have been promoted by Typhoon Prapiroon which is currently located over the northern Kuril Islands and near Kamchatka where a strong earthquake could be triggered by stresses from this storm. This summary had previous noted this as:

 

"Typhoon Prapiroon (09W) continued today in the region over northern Honshu, Japan with winds up to 55 kts. It is expected to track to the north possibly affecting seismicity in Honshu, Japan as it set up over the island. This can lead to unloading conditions on the island which could help promote a strong regional earthquake in the next several days." (July 2-5, 2018)

 

NEIC reported this earthquake was felt with intensity V in Kamchatka at Petropavlovsk and Mohovaja and in Jelizovo, Kamchatka with intensity III. The mainshock was followed by an M 5.4 aftershock about 250 km to the northeast of the mainshock. The last earthquake in this area of Kamchatka within about 300 km of these epicenters occurred on March 20, 2016 (M 6.4) and prior to that an M 7.2 on January 30, 2016.  Forecast 117827 had expected a possibly strong quake in Kamchatka at the end of June or in early July. Like recent unusual events in Nebraska, Oklahoma, and Mexico, this epicenter is located near the seventh node from Hawaii and may have been  promoted from that source.

 

O:  6JUL2018 01:40:07  51.6N  157.9E Mw=6.1  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 28JUN2018 117827    51.0N  156.0E 4.0-5.7 BAAAA  Kamchatka                  

 

O:  6JUL2018 04:32:19  53.0N  160.3E mb=5.4  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 26JUN2018 117824    52.0N  160.0E 4.0-5.8 CAAAA  E. of Kamchatka            

 

The strongest earthquake in the U.S. or Canada outside Hawaii today occurred in Nevada near the California border with M 4.5. NEIC reported it was felt with intensity V in Tecopa and II-III in Nevada at Pahrump, Las Vegas, Jean, and Henderson. This moderate earthquake of M 4.5 shook areas of Central California and southern Nevada today. This event is located near Las Vegas and is the strongest within about 100 km of this epicenter since an M 4.6 16 years ago on June 14, 2002. An aftershock of the Landers earthquake in June, 29, 1992 of M 5.8 was the strongest event in the area since 1990.  Forecast 117725 had expected the area to be active at the end of June or in early July. This epicenter is located at 103 degrees from the Papua New Guinea quake of February 25, 2018 of M 7.5. This summary has long maintained triggering from this source was likely in Southern California and Nevada.

 

O:  5JUL2018 15:17:36  35.9N  115.8W ML=4.5  EMSC   CENTRAL CALIFORNIA            

P: 29JUN2018 117725    37.8N  115.8W 2.5-4.6 CBAAA  California/Nevada area     

 

 

The strongest earthquake in Alaska was an M 4.7 in Central Alaska near Anchorage. NEIC reported it was felt with intensity II-III in Anchorage, Wasilla, Elmendorf AFB, Willow, Eagle Rive, Talkeetna, Girdwood and Fairbanks, Alaska. The last earthquake within about 150 km of this epicenter in southern or central Alaska was an M 4.9 on August 11, 2017 about 150 km to the southwest of this epicenter. Forecast 117842 had expected this activity within about 50 km of the epicenter.

 

O:  6JUL2018 02:07:12  61.5N  151.2W mb=4.7  EMSC   SOUTHERN ALASKA              

P: 29JUN2018 117842    61.3N  152.3W 3.2-5.1 CAAAA  Central Alaska             

 

The strongest quake in the U.S. was an M 5.2 associated with the current strong eruption of Kilauea in Hawaii. NEIC reported it was felt with intensity IV in Volcano and II-III in Mountain View, Hilo, Keaau and Papaikou, Hawaii. Many other smaller events were also lightly felt in the region of Volcano, Hawaii.

 

O:  5JUL2018 23:20:50  19.4N  155.3W ML=5.2  EMSC   ISLAND OF HAWAII, HAWAII     

P: 27JUN2018 117687    18.8N  155.2W 3.0-4.5 CAAAA  Hawaii                     

 

ENHANCED SEISMICITY CONTINUES IN EASTERN MEDITERRANEAN AREA

 

EARTHQUAKE SUMMARY FOR JULY 4, 2018

 

Seismicity in the area of the eastern Mediterranean Sea remained at high levels today. This included an M 4.8 in the Dead Sea area of Israel, the strongest in the current swarm and an M 5.0 in Albania, an unusually large quake for Albania.

The swarm of earthquakes in Israel in the Dead Sea area continued and enhanced today with an M 4.8. NEIC reported it was felt in Israel in Hazafon with intensity IV in Eilabun, Yavne'el, Rame, Zefat, Rosh Pinna, Shagor, Hazor HaGelilit. Lesser shaking of II-III was felt in Israel at Nazerat Illit, Nazerat, Iksal, Sajur, Ilut, Karmiel, Neink Peqi'in, Sulam, Timrat, Kisra-Sumei, Afula, Jish, Tuba-Zangariyye, Hazor HaGelilit, Kefar Weradim, Qiryat Tiv'on, Yoqnw'qm Illit, in Haifa at Rekhasim, in Jordan at al-Mugayyir and al-Mansiyah, and in general within about 200 km of the epicenter. It was also reported felt in Lebanon, Saudi Arabia, Syria and Jordan. The last earthquake of M>=4.8 in the Dead Sea region was an M 5.1 on February 15, 2008 more than 10 years ago.  Forecast 117771 had expected this activity in late June or early July.

 

O:  4JUL2018 19:45:40  32.8N   35.5E mb=4.5  EMSC   DEAD SEA REGION              

O:  4JUL2018 19:45:40  32.8N   35.5E mb=4.8  ANSS   DEAD SEA REGION              

O:  4JUL2018 21:49:27  32.9N   35.6E ML=3.5  EMSC   DEAD SEA REGION              

P: 28JUN2018 117771    34.0N   32.0E 3.5-5.2 CAAAA  Turkey                     

 

An unusual earthquake of M 5.0 was felt in Albania with intensity VI in Berat, Albania and V in Albania at Durres, Kruje, Tirana, and IV in Kavaje, Elbasan, Albania among other communities. Lesser shaking was reported more than 100

km from the epicenter in Serbia and Montenegro at Podgorica, Ulcinj, Niksic; in Macedonia at Dolna Banjica, Sopiste; in Cavtat and Dubrovnik, Croatia and as far as Bari, Italy. An aftershock of M 4.4 shook regions of Albania today. NEIC reported intensity VI in Tirana and III in Kavaje, Albania. No major damage was reported. The last earthquake within about 150 km of this epicenter in Albania with M>=5 occurred on May 19 and December 29, 2014 with M 5.0 and prior to that on September 6, 2009. Forecast 117777 had expected today's epicenter would be active within about 50 km at the end of June or in early July. Like much of the current unusual global activity this epicenter is located at a nodal distance from Hawaii (node 3, 120 degrees) suggesting some promotion from that source.

 

 

O: 04JUL2018 11:35:32  41.4N   19.5E ML=3.8  EMSC   ALBANIA

O: 04JUL2018 16:36:07  41.4N   19.6E ML=3.5  EMSC   ALBANIA

O: 04JUL2018 11:30:45  41.5N   19.5E ML=3.3  EMSC   ADRIATIC SEA

O: 04JUL2018 09:08:58  41.5N   19.5E ML=4.2  EMSC   ADRIATIC SEA

O: 04JUL2018 11:24:20  41.5N   19.5E mb=4.4  EMSC   ALBANIA

O: 04JUL2018 12:06:18  41.5N   19.6E ML=3.1  EMSC   ALBANIA

O: 04JUL2018 13:33:30  41.5N   19.6E ML=3.6  EMSC   ALBANIA

O: 04JUL2018 11:42:22  41.6N   19.5E ML=3.5  EMSC   ADRIATIC SEA

O: 04JUL2018 09:11:30  41.6N   19.6E ML=3.0  EMSC   ALBANIA

O: 05JUL2018 01:39:47  42.3N   18.9E ML=3.6  EMSC   MONTENEGRO

O: 04JUL2018 09:01:08  41.4N   19.5E mw=5.0  ANSS   NNW of Shijak Albania

O:  4JUL2018 09:01:08  41.4N   19.5E mb=4.9  EMSC   ALBANIA                      

P: 24JUN2018 117777    42.0N   19.0E 3.0-5.1 CAAAA  Adriatic Sea               

P: 29JUN2018 117805    40.0N   21.0E 3.0-4.9 BBAAA  Romania/NW Turkey          

 

The strong eruption of Kilauea volcano in Hawaii continued today. The strongest associated earthquake was an M 5.3 that was felt with intensity V in Hawaii at Volcano, Kaunakakai and II-III in Mountain View, Hilo and Keaau, Hawaii.

The current eruption at Hawaii and in the Galapagos and Guatemala may related to higher surface temperatures around the world over the past decades. This may finally be reaching deep enough to affect magma chambers. Small changes in temperature are amplified in volatility and viscosity in magma leading to additional movement and possible eruptions. Global modelers of climate change need to take this into account in their models as it would be a cooling effect from gasses and particulates from erupting volcanoes which may increase in the next several decades. In the near term the eruption of Hawaii appears to be continuing to depress global seismicity as it relieves some stress in earthquake-prone areas.

 

O:  4JUL2018 20:19:10  19.4N  155.3W Mw=5.3  EMSC   ISLAND OF HAWAII, HAWAII     

P: 27JUN2018 117687    18.8N  155.2W 3.0-4.5 CAAAA  Hawaii                     

 

The strongest earthquake in the world today was an M 5.5 in Vanuatu. NEIC reported it was felt with intensity V in Luganville, Sanma, Vanuatu.

The last earthquake of M>=5.5 in northern Vanuatu occurred on June 28, 2018 (M 5.5). The only other event in this area of M>=5.5 in the past half year was an M 5.8 on April 30, 2018. Forecast 117863 expected this area would be active with moderate seismicity at the end of June or in early July. Like the continuing swarm in Nebraska and Oklahoma, this epicenter is located at the seventh node from Hawaii (51 degrees).

 

O:  4JUL2018 16:37:04  14.9S  167.4E Mw=5.5  EMSC   VANUATU                      

P: 28JUN2018 117863    12.0S  166.0E 4.0-5.8 CCAAA  Vanuatu Islands             

 

Moderate earthquakes in and near Honshu, Japan continued today with an M 4.4 near the south coast of Honshu and an M 4.2 off the east coast of Honshu. Forecasts 117735 and 117751 expected this activity within about 100 km of the epicenters. These may have been promoted by Typhoon Prapiroon which is currently located over the northern Kuril Islands and near Kamchatka where a strong earthquake could be triggered by stresses from this storm. This summary had previous noted this as:

 

"Typhoon Prapiroon (09W) continued today in the region over northern Honshu, Japan with winds up to 55 kts. It is expected to track to the north possibly affecting seismicity in Honshu, Japan as it set up over the island. This can lead to unloading conditions on the island which could help promote a strong regional earthquake in the next several days." (July 2-4, 2018)

 

O:  4JUL2018 11:04:10  33.0N  136.0E mb=4.4  EMSC   NEAR S. COAST OF WESTERN HONSH

P: 27JUN2018 117735    34.0N  137.0E 3.5-4.9 CAAAA  Central/So. Honshu Japan   

 

O:  5JUL2018 05:40:32  37.4N  141.5E mb=4.2  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 28JUN2018 117751    39.0N  141.0E 4.0-5.7 CBAAA  Off East Coast Honshu      

 

DEAD SEA SEES MINOR SWARM

 

EARTHQUAKE SUMMARY FOR JULY 3, 2018

 

An unusual series of earthquakes including two of M 4.0 in the Dead Sea area of Israel was widely felt today. NEIC reported intensity II-III in Hazafon at Bu'eine, Tiberias, Yavne'el, Segev-Shalom, and Zefat; in Haifa at Baqa-Jatt and in Be'er Sheva, Hadarom and Bayurt, Lebanon. Earthquakes in the region are occasionally felt. The tectonics is not unlike that in the San Andreas Fault zone in California and is expected at this time with horizontal motions active throughout the world, likely related to the volcanic eruption at Kilauea. Because of the political instability and the potential for a strong earthquake in the region, the area is closely watched by many geoscientists. The last earthquake of M>=4 within about 200 km of this epicenter was an M 4.4 on January 8, 2017 and prior to that an M 4.1 on July 30, 2015. Forecast 117771 had expected this activity was likely at the end of June. The Dead Sea is at 107 degrees from Papua New Guinea and Bolivia, sites of recent large earthquakes and at the fourth node (90 degrees) from the great Gulf of Alaska quake and may have been promoted from these sources.

 

O: 04JUL2018 03:41:21  32.8N   35.6E Mm=2.1  EMSC   DEAD SEA REGION

O: 04JUL2018 01:50:08  32.8N   35.6E mb=4.0  EMSC   DEAD SEA REGION

O: 04JUL2018 04:19:18  32.9N   35.6E ML=2.8  EMSC   DEAD SEA REGION

O: 04JUL2018 01:58:13  32.9N   35.6E ML=3.3  EMSC   DEAD SEA REGION

O:  4JUL2018 03:52:00  32.9N   35.6E ML=4.0  EMSC   DEAD SEA REGION              

P: 28JUN2018 117771    34.0N   32.0E 3.5-5.2 CBCAA  Turkey                     

 

The strongest seismicity in the world continued today in the region of Indonesia and the Philippines. The largest since last report was an M 5.3 in the Andaman Islands, India however an M 5.6, reported in the previous summary also occurred in southern Mindanao, Philippines. The last earthquake in the Andaman Island, India within about 200 km of this epicenter occurred on February 13, 2018 with M 5.6. An M 5.3 also occurred on April 5, 2017. Forecast 117674 had expected this event was likely within about 100 km of this epicenter around June 29.

 

O:  4JUL2018 07:12:51  13.1N   92.5E mb=5.3  EMSC   ANDAMAN ISLANDS, INDIA REGION

P: 29JUN2018 117674    14.0N   92.0E 4.0-5.6 BAAAA  Andaman Islands            

 

The strongest earthquake in the U.S. today was an M 5.2 associated with a strong eruption at Kilauea, Hawaii. NEIC reported it was felt with intensity IV in Volcano and III in Hilo and Kaunakakai, Hawaii.

 

O:  3JUL2018 12:17:03  19.4N  155.3W Mw=5.1  EMSC   ISLAND OF HAWAII, HAWAII     

P: 27JUN2018 117687    18.8N  155.2W 3.0-4.5 CAAAA  Hawaii                     

 

The strongest earthquake in the U.S. outside Hawaii today was an M 4.3 in the eastern Andreanof Islands of Alaska. This is the strongest earthquake in eastern Andreanof Islands since a similar M 4.3 on January 28, 2018. Forecast 117821 had expected this activity at the end of June.

 

O:  3JUL2018 18:17:14  51.6N  173.7W mb=4.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 26JUN2018 117821    52.4N  174.3W 3.5-5.1 CAAAA  Andreanoff Isls, Aleutians 

 

EARTHQUAKES SHAKE PHILIPPINES AND TAIWAN

 

EARTHQUAKE SUMMARY FOR JULY 2, 2018

 

A series of moderate earthquakes today hit the regions of the Philippines and Taiwan. They were largest in the region of central Luzon (M 5.4) and southern Mindanao, Philippines (M 5.6). These were probably promoted by several typhoons in the area over the past several days as noted in previous issues of this summary:

 

 

"TS Prapiroon (09W) continued today in the region east of Taiwan and the Northern Philippines with winds up to 65 kts. It is expected to track to the north possibly affecting seismicity in Taiwan and the Ryukyu Islands through early July." (July 1, 2018)

 

and

 

"Typhoon Prapiroon (09W) continued today in the region of the Ryukyu Islands with winds up to 90 kts. It is expected to track to the north possibly affecting seismicity in Honshu, Japan as it set up over the island. This can lead to unloading conditions on the island which could help promote a strong regional earthquake in the next several days." (July 2, 2018)

 

The strongest earthquake in the world today was an M 5.4 in Luzon, Philippines.

NEIC reported it was felt in Southern Tagalog, Philippines at Payapa, Mendez, San Nicolas, Bitangan, Malabag, Solo, Bagalangit, Dasmarinas, Puting Kahoy, Aplaya, Kanluran, Carmona, Cavite, Imus, Bacoor, in Central Luzon at Orion, Bagac and in Manila and within about 200 km of the epicenter.  PHI reported it was felt with intensity IV in Nasugbu, Batangas, Luband and Abra de Ilog, Occidental Mindoro; III in Balayan, Tuy, Talisay and Calatagan, Batangas; Quezon City, Calrk, Pampanga, Mandaluyong City, Puerto Galera, Oriental Mindoro; Looc and Mamburao, Occidental Mindoro, Tanza and Maragondon, Cavity; Makati City, Pasay City, Tagaytay City and II in Manila City, Plaridel, Obando and Malolos, Bulacan; Paranaque City, Philippines.

 

O:  2JUL2018 12:47:39  10.2N  126.1E mb=4.9  EMSC   PHILIPPINE ISLANDS REGION    

O: 02JUL2018 12:47:32  10.4N  126.4E MS=4.9  PHI  Felt with intensity III

P: 26JUN2018 117689    10.0N  125.0E 3.5-4.9 CAAAA  Luzon, Philippines         

 

PHI reported the earthquake of M 5.4 was felt with intensity III in Burgos and Santa Monica, Surigao del Norte, Philippines.

 

O:  3JUL2018 04:25:54  14.0N  120.7E mb=5.4  EMSC   LUZON, PHILIPPINES           

O: 03JUL2018 04:25:54  13.9N  120.4E MS=5.2  PHI  Felt with intensity IV

P: 23JUN2018 117689    17.0N  120.0E 3.5-4.9 CCAAA  Luzon, Philippines         

 

The strongest earthquake in this series today was an M 5.6, also the strongest in the world today. PHI reported this earthquake was felt with intensity V Glan, Malapatan, Alabel and Malungon, Sarangani; Tupi and Polomolok, South Cotabato and IV in Mati City; Davao City; Sta Cruz, Davao del Sur, Philippines. Forecast 117644 had expected this event was likely at the end of June. The last earthquake within about 150 km of this epicenter with M>=5.6 was an M 5.8 on  August 5, 2017 and prior to that an M 6.9 on April 28, 2017.

 

O:  3JUL2018 11:59:23   5.8N  125.2E MS=5.6  PHI  Felt with intensity V Glan, Mala

P: 26JUN2018 117644     4.0N  126.0E 4.0-5.6 CBAAA  Mindanao, Philippines      

 

A series of four moderate earthquakes also shook the region of Taiwan today. CWB reported the M 4.5 and M 4.6 were felt with intensity IV in Chiayi County; III in Yunlin, Tainan, Changhua, II in Kaohsiung; I in Nantou, Taitung, Taichung, Pingtung, Penghu and Hualien Counties, Taiwan. The M 4.0 was felt in Chiayi with intensity IV; II in Yunlin, Tainan and Changhua and I in Kaohsiung Counties.

The second M 4.5 was reported felt with intensity IV in Kaohsiung; III in Taitung; II in Chiayi and Yunlin and I in Tainan, Pingtung, Hualien, Nantou, Taitung, Taichung Counties, Taiwan. NEIC reported this earthquake of M 4.2 in Taiwan was felt with intensity VI in Chiayi and II-III in the area(s) of Taichung, Taiwan. Forecast 117718 had expected this activity was likely at the end of June.

 

O:  2JUL2018 07:26:10  23.5N  120.5E ML=4.5  TAI    Hualien, Taiwan              

O: 03JUL2018 09:20:55  23.2N  121.0E Mw=4.6  EMSC   TAIWAN

O: 02JUL2018 19:36:59  23.5N  120.5E ML=4.0  EMSC   TAIWAN

O: 02JUL2018 07:26:10  23.5N  120.5E ML=4.2  EMSC   TAIWAN

O:  2JUL2018 07:26:27  23.4N  120.5E ML=4.6  TAI    Hualien, Taiwan              

O:  2JUL2018 19:36:59  23.4N  120.5E ML=4.0  TAI    Hualien, Taiwan               

O:  3JUL2018 09:20:54  23.1N  120.9E ML=4.5  TAI    Hualien, Taiwan              

P: 27JUN2018 117718    22.0N  121.0E 4.0-5.6 BBAAA  Taiwan                     

 

Light earthquakes in central Nebraska continued today. Some of these including an M 2.7 were felt with intensity II in Harvard, Nebraska nearly 200 km from the epicenter. An M 3.8 was reported felt with intensity IV in Arnold and Merna, Nebraska. This activity began early this week and may be related to an upsurge in  seismicity in Alaska over the past several days.

 

O:  2JUL2018 21:43:48  41.4N  100.1W mb=2.7  EMSC   NEBRASKA                     

O:  2JUL2018 16:25:50  41.4N  100.2W mb=3.8  EMSC   NEBRASKA                     

 

The strongest earthquake in the U.S. or Canada today occurred as an M 5.3 in association with a strong eruption of Kilauea Volcano in Hawaii. NEIC reported it was felt with intensity VII in Volcano, Hawaii and IV at Captain Cook with lesser shaking reported from Paauilo and Kailua Kona, Hawaii. More than 70 earthquakes of M>=3 were recorded in Hawaii today including a number lightly felt in Volcano, Hawaii. This represents one of the most active days since the eruption began.

 

O:  2JUL2018 11:24:25  19.4N  155.3W Mw=5.3  EMSC   ISLAND OF HAWAII, HAWAII     

P: 27JUN2018 117687    18.8N  155.2W 3.0-4.5 BAAAA  Hawaii                     

 

The strongest earthquakes in the U.S. or Canada today occurred in the Unimak Island area of Alaska (M 4.5) and in the Alaska Peninsula (M 4.6). The earthquake in the Alaska Peninsula was the strongest within about 200 km of that epicenter since an M 4.6 on November 21, 2017. The last of significantly larger magnitude in this area was an M 5.3 on November 12, 2016.  Forecast 117817 had expected this are to be active in late June.

 

O:  3JUL2018 07:07:11  57.1N  158.0W mb=4.6  EMSC   ALASKA PENINSULA             

P: 29JUN2018 117817    54.7N  156.9W 3.5-5.3 BCAAA  Alaska Peninsula           

 

The earthquake in the Unimak Island area of Alaska (M 4.5)  was not reported felt in this remote area. The last event of M>=4.5 in the Unimak Island region was an M 4.8 a year ago on June 30, 2017. Forecast 117837 had expected this activity was likely at the end of June.

 

O:  2JUL2018 11:56:08  55.0N  163.0W mb=4.5  EMSC   UNIMAK ISLAND REGION, ALASKA 

P: 29JUN2018 117837    52.5N  163.7W 3.5-4.9 BCAAA  Unimak Islands, Aleutians  

 

STRONG EARTHQUAKE IN SEA OF OKHOTSK

 

EARTHQUAKE SUMMARY FOR JULY 1, 2018

 

An unusually large M 6.0 earthquake occurred today in the Sea of Okhotsk north of the Kuril Islands. This is the largest earthquake in the Sea of Okhotsk  since a M 6.1 on November 7, 2004 and prior to that an M 7.3 on November 17, 2002. This event occurred at a deep focus and was not reported felt on the surface which is in a remote area. Forecat 117809 had expected the area would be active at moderate to large levels at the end of June. This epicenter is at 144 degrees from the M 6.8 in Bolivia of April 2 and may have been promoted from that source.

 

O:  1JUL2018 20:45:41  46.9N  144.9E mb=6.0  EMSC   SEA OF OKHOTSK               

P: 28JUN2018 117809    47.0N  143.0E 3.5-5.5 BABAA  So. Kurils                 

 

A pair of moderate earthquakes hit the ends of the Atlantic Ocean today. The strongest of these was an unusual M 5.3 in the South Sandwich Islands region. A similar quake of M 5.3 occurred about 100 northwest of today's epicenter on April 24, 2018 but it has been 23 years since a larger quake hit the area on June 15, 1995 (M 5.7). The only other such event in the area since 1990 was an M 5.6 on May 30, 1995. Forecast 117900 had expected today's activity at the end of June.

 

O:  2JUL2018 03:09:14  60.7S   30.1W mb=5.3  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 26JUN2018 117900    61.0S   34.0W 4.0-5.6 BABAA  Southern  Ocean            

 

An hour after the event in the South Sandwich Islands, an M 4.9 occurred at the northern end of the Atlantic. These two may have been promoted by the recent geomagnetic storm. The event in Svalbard was not felt in this remote area. A similar event within about 100 km of today's epicenter occurred on June 5, 2018 with M 4.9. Forecast 117850 had expected it to the south at the end of June.

 

O:  2JUL2018 04:10:27  77.4N    7.8E mb=4.9  EMSC   SVALBARD REGION              

P: 28JUN2018 117850    74.0N   14.0E 3.0-4.6 BCAAA  Norway                     

 

The largest earthquake in the U.S. or Canada today was an M 4.2-4.5 in the Alaska Peninsula. It was not reported felt in the epicentral area. The last earthquake of equal or greater magnitude than M 4.2 within about 200 km of this epicenter was an M 5.1-5.3 on May 11, 2018. Forecast 117817 expected activity in the Alaska Peninsula around June 29.

 

O:  1JUL2018 19:54:54  57.0N  155.6W ML=4.2  EMSC   ALASKA PENINSULA             

P: 29JUN2018 117817    54.7N  156.9W 3.5-5.3 ACAAA  Alaska Peninsula           

 

 

EARTHQUAKE SERIES CONTINUES IN NEBRASKA; JOINED BY M 4.9 IN SOUTHERN ALASKA

 

EARTHQUAKE SUMMARY FOR JUNE 30, 2018

 

The M 4.2 in central Nebraska which occurred yesterday was followed today by a series of light to moderate earthquakes in the same area including an M 4.1-4.7.

This was accompanied by an unusually large M 4.9 in southern Alaska. These may be related as noted in the previous issue of this summary:

 

"The most unusual and largest earthquake in the U.S. or Canada outside Hawaii today was an M 4.2 in Nebraska. NEIC reported it was felt with intensity IV in Nebraska at Arnold and North Platte and II-III in Callaway, Stapleton, Brady. Earthquakes in this area often precede by hours to days moderate to strong earthquakes along the western rim of the North American Plate. These are usually in the region of Alaska but can occur as far south as California." (June 30, 2018)

 

The Nebraska quakes today were reported by NEIC to have been felt with intensity IV in Nebraska at Merna, Arnold, and Grand Island and II-III in Callaway, Stapleton and Moorefield. An M 3.7 was felt with intensity V in Arnold and III in Mason City, Nebraska. These events occurred near local solar midnight and may have been enhanced by high tidal stresses.

 

O: 01JUL2018 07:49:53  41.4N  100.1W mb=2.7  EMSC   NEBRASKA

O: 01JUL2018 08:12:16  41.4N  100.1W mb=3.7  EMSC   NEBRASKA

O:  1JUL2018 08:41:57  41.3N  100.1W mb=4.1  EMSC   NEBRASKA                     

 

The earthquake in Southern Alaska of M 4.9 was reported by NEIC to have been felt with intensity IV within about 150 km of the epicenter in Denali National Park, Matanuska-Sustina Border and Talkeetna and II-III in Cantwell, Healy, Willow, Skwentna, Wasilla, Chugiak, Elmendorf AFB, Palmer, Anchorage, Eagle River, Indian, Fairbanks, Girdwood, Sterling, Cooper Landing and Soldotna, Alaska. The largest of the Nebraska event (M 4.1) occurred 21.5 minutes after this M 4.9 in Alaska at a distance of 37 degrees (node 10). The surface waves from Alaska would have passed Nebraska within a minute of this time and probably helped trigger this subsequent event. It has been more than a year since an M 4.9 or greater quake hit this area of central Alaska within about 200 km of this epicenter. The last such events were of M 5.2 on January 31, 2017 and April 29, 2017. Forecast 117842 had expected today's event within about 20 km of the epicenter was likely at the end of June or in early July.

 

O:  1JUL2018 08:20:16  63.1N  150.8W ML=4.9  EMSC   CENTRAL ALASKA               

O: 30JUN2018 18:25:58  63.2N  151.6W ML=3.1  EMSC   CENTRAL ALASKA               

P: 24JUN2018 117842    63.2N  151.4W 3.2-5.3 CAAAA  Central Alaska             

 

A moderate swarm of earthquakes of M 3.4-3.8 occurred in the Virgin Islands region today.  NEIC reported this earthquake of M 3.8 in the Virgin Islands was felt with intensity II-III in the area(s) of Bayamon, Puerto Rico.  The last swarm in the area including an M 3.8 quake occurred on April 11, 2018 with M 4.2, 4.3 and 4.5. Forecast 117688 had expected this activity was likelyin the Virgin Islands at the end of June.

 

O: 01JUL2018 00:34:57  18.9N   64.3W MD=3.6  EMSC   VIRGIN ISLANDS REGION

O: 01JUL2018 03:02:17  19.0N   64.3W ML=3.5  EMSC   VIRGIN ISLANDS REGION

O: 01JUL2018 05:00:45  19.0N   64.5W ML=3.5  EMSC   VIRGIN ISLANDS REGION

O: 01JUL2018 03:17:31  19.1N   64.6W MD=3.4  EMSC   VIRGIN ISLANDS REGION

O: 01JUL2018 00:41:58  19.2N   64.5W MD=3.6  EMSC   VIRGIN ISLANDS REGION

O: 01JUL2018 03:39:39  19.2N   64.6W ML=3.8  EMSC   VIRGIN ISLANDS REGION

O:  1JUL2018 01:44:15  19.3N   64.4W MD=3.4  EMSC   VIRGIN ISLANDS REGION        

P: 27JUN2018 117688    18.0N   64.0W 3.0-5.0 BBAAA  Leeward Islands            

 

A strong eruption of Kilauea, Hawaii with associated magnitude M 5.3 was felt today with intensity IV in Volcano, Hawaii and II-III in Hilo, Kamuela and Wailuku.

 

O: 30JUN2018 21:45:29  19.3N  155.1W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 01JUL2018 07:22:49  19.3N  155.3W ML=3.8  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 07:44:26  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 08:35:51  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 09:05:00  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 11:40:56  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 11:51:00  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 19:05:45  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 19:19:50  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 20:26:42  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 21:15:46  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 22:16:04  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 22:21:10  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 22:33:30  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 23:07:45  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 07:02:59  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 09:03:02  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 09:11:08  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 09:58:33  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 10:39:08  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 12:49:49  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 12:59:17  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 14:27:12  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 19:00:35  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 19:10:56  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 07:05:08  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 08:42:51  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 08:44:17  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 10:48:47  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 13:08:33  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 19:07:40  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 20:19:41  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 21:47:05  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 21:53:14  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 22:22:29  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 08:38:30  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 14:19:12  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 14:21:55  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 19:12:38  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 23:39:03  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 14:20:31  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 20:15:49  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 21:20:35  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 11:48:51  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 20:23:00  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 21:22:35  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 23:13:23  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 16:05:01  19.4N  155.3W ML=3.6  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 13:09:34  19.4N  155.3W ML=3.7  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 07:06:10  19.4N  155.3W ML=3.8  EMSC   ISLAND OF HAWAII, HAWAII

O: 01JUL2018 00:48:05  19.4N  155.3W ML=4.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 13:10:41  19.4N  155.3W mb=4.1  EMSC   ISLAND OF HAWAII, HAWAII     

O: 01JUL2018 00:51:12  19.4N  155.3W Mw=5.3  EMSC   ISLAND OF HAWAII, HAWAII

P: 27JUN2018 117687    18.8N  155.2W 3.0-4.5 BAAAA  Hawaii                     

 

STRONG JALISCO, MEXICO QUAKE PROBABLY TRIGGERED UNUSUAL QUAKE IN NEBRASKA

 

EARTHQUAKE SUMMARY FOR JUNE 29, 2018

 

The strongest earthquake in the world today was an M 6.0 off the coast of Jalisco, Mexico. NEIC reported it was felt with intensity IV in Jalisco at San Patricio, Las Juntas and Cihuatlan and II-III in Jalisco at El Grullo, Talpa, Tenamaxtland, Mascota, Puerto Vallarta, Ixtapa, Ixtlan, Cocula, Guadalajara, Zapopan,   in Colima at Suchitlan, Manzanillo, Villa de Alvarez, in Bucerias, Nayarit; and in Morelia, Michoacan, Mexico.   This event was followed by unusual earthquakes in Nebraska (M 4.2) and the Gulf of Mexico. The earthquake in the Gulf of Mexico occurred within about 15 minutes of local solar midnight and was probably promoted by strong tidal stresses associated with the full moon which maximize at this hour. The only event in the past 30 years within about 250 km of this epicenter with M>=4.4 was an M 5.6 about 150 km northwest of today's epicenter on May 23, 2007. Forecast 117697 had expected regional activation towards the end of June.

 

O: 30JUN2018 06:14:44  21.4N   95.1W ML=4.4  EMSC   GULF OF MEXICO               

P: 25JUN2018 117697    19.0N   99.0W 3.5-5.2 BCCAA  Oaxaca, Mexico             

 

The M 6.0 in the area south of Jalisco, Mexico was the strongest in Jalisco, Mexico since an M 6.2 on June 7, 2016 and prior to that an M 7.6 on January 22, 2003. Forecast 117691 had expected this event within about 15 km of this epicenter was likely towards the end of June.

 

O: 30JUN2018 03:56:52  19.1N  105.1W Mw=6.0  EMSC   OFFSHORE JALISCO, MEXICO     

O: 30JUN2018 03:56:52  19.1N  105.1W mw=6.0  ANSS   San Patricio Mexico

P: 25JUN2018 117691    19.0N  105.0W 3.5-5.1 BAAAA  Michoacan, Mexico          

 

The most unusual and largest earthquake in the U.S. or Canada outside Hawaii today was an M 4.2 in Nebraska. NEIC reported it was felt with intensity IV in Nebraska at Arnold and North Platte and II-III in Callaway, Stapleton, Brady. Earthquakes in this area often precede by hours to days moderate to strong earthquakes along the western rim of the North American Plate. These are usually in the region of Alaska but can occur as far south as California. Today's earthquake in Nebraska may have been triggered by seismic energy from the M 6.0 off the coast of Jalisco Mexico which occurred 20 minutes earlier and probably disturbed ground waters in Nebraska. Ground waves as well as the ScS phase would have arrived in Nebraska several minutes before the earthquake there. The Nebraska event is located 23 degrees north of Jalisco and occurred 24 minutes after that event. The last earthquake of M>=4.2 within Nebraska and within about 100 km of this epicenter occurred on November 3, 2002 with M 4.2 in association with the great Denali, Alaska earthquake (M 7.9) of the same date. This was the only such event in the area since 1990. This earthquake in Nebraska is at 51.4 degrees (node 7) from Hawaii and also may have been promoted from that source.

 

O: 30JUN2018 04:20:26  41.4N  100.1W mb=4.2  EMSC   NEBRASKA                     

O: 30JUN2018 04:20:26  41.4N  100.1W mb=4.2  ANSS   Broken Bow Nebraska

 

An earthquake of M 2.1 also occurred north of Portland, Maine today but was not reported felt. The last earthquake of M>=2.1 within about 100 km of this epicenter was an M 2.1 on May 21, 2018. The only earthquake in the area in the past five years of M>2.1 was an M 2.6 on January 17, 2018. Forecast 117788 had expected regional activity near this epicenter in late June.

 

O: 29JUN2018 19:49:40  45.4N   69.0W ML=2.1  EMSC   MAINE                        

P: 23JUN2018 117788    44.0N   69.0W 2.0-4.1 CBAAA  Maine                      

 

An M 5.2 earthquake was associated with a strong eruption in Kilauea today. NEIC reported it was felt with intensity V in Volcano and II-III in Mountain View, Hilo and Pahoa, Hawaii. Smaller earthquakes were also felt in the Volcano area of Hawaii. More than 50 earthquakes of M>=3 were recorded in Hawaii today, one of the most active days since the eruption began in late April.

 

O: 29JUN2018 08:00:38  19.4N  155.3W MD=3.6  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 06:30:42  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 09:52:31  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 10:25:28  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 11:15:34  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 12:54:22  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 14:14:55  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 14:17:48  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 15:42:12  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 15:51:59  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 16:07:46  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 03:47:11  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 04:58:40  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 05:59:20  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 07:52:07  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 10:28:58  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 10:41:49  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 16:00:03  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 16:46:47  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 17:08:12  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 17:42:53  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 00:25:14  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 08:52:54  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 09:54:13  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 13:38:48  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 14:55:12  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 14:59:00  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 15:10:27  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 16:48:12  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 22:22:25  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 03:56:29  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 10:33:40  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 11:12:28  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 11:54:37  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 15:50:27  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 14:57:09  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 15:06:04  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 02:54:57  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 04:51:22  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 30JUN2018 04:52:45  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 12:50:56  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 15:52:59  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 17:05:55  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 14:16:26  19.4N  155.3W ML=3.6  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 17:48:21  19.4N  155.3W ML=3.7  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 12:49:48  19.4N  155.3W ML=3.8  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 17:46:29  19.4N  155.3W mb=4.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 12:47:45  19.4N  155.3W mb=4.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 17:50:46  19.4N  155.3W Mw=5.2  EMSC   ISLAND OF HAWAII, HAWAII     

P: 27JUN2018 117687    18.8N  155.2W 3.0-4.5 AAAAA  Hawaii                     

 

EQUATORIAL SEISMICITY INCREASES

 

EARTHQUAKE SUMMARY FOR JUNE 28, 2018

 

Seismicity in the world today began to return to normal background levels  especially along the geomagnetic equator. Moderate to moderately large quakes were registered in Vanuatu (M 5.5); Papua New Guinea (M 5.3). Strong swarms also continued near the equator in the Galapagos Islands. Much of this may have been promoted by geomagnetic effects from the latest geomagnetic storm as noted in previous issues of this summary:

 

"The geomagnetic field saw quiet conditions today. The AP level was 5 High latitude geomagnetic field saw disturbed conditions  with AP at 5. This concludes the strongest geomagnetic storm since June 1. Some increases in seismicity are likely around the end of June and early July especially near the geomagnetic equator and at high latitudes." (June 26-29, 2018)

 

O: 28JUN2018 16:47:50  15.1S  167.4E Mw=5.5  EMSC   VANUATU                      

P: 27JUN2018 117864    18.0S  168.0E 4.0-5.8 ACAAA  Vanuatu Islands             

 

O: 29JUN2018 01:55:31   5.9S  142.7E mb=5.3  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

P: 28JUN2018 117665     5.0S  143.0E 4.0-5.5 AAAAA  Papua New Guinea           

 

NEIC reported this earthquake of M 5.3 in Papua New Guinea was felt with intensity II-III in the area(s) of Tari, Southern Highlands, PNG.

 

O: 29JUN2018 01:42:53   0.8S   91.1W ML=3.0  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 28JUN2018 18:05:20   0.8S   91.1W ML=3.1  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 28JUN2018 13:08:37   0.8S   91.1W ML=3.2  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 28JUN2018 20:18:21   0.8S   91.1W ML=3.2  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 28JUN2018 18:08:03   0.8S   91.1W ML=3.4  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 28JUN2018 07:50:21   0.8S   91.1W ML=3.5  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 28JUN2018 09:19:06   0.8S   91.1W ML=3.7  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 29JUN2018 05:50:29   0.9S   91.1W ML=3.0  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 28JUN2018 12:24:31   0.7S   91.0W ML=3.0  EMSC   GALAPAGOS ISLANDS, ECUADOR    

O: 28JUN2018 13:33:45   2.9S   90.3W ML=3.9  EMSC   GALAPAGOS ISLANDS REGION     

P: 27JUN2018 117641     2.0N   91.0W 3.5-5.1 ACAAA  Galapagos Islands          

 

A strong eruption of Kilauea volcano in Hawaii today was accompanied by an earthquake of M 5.3. NEIC reported it was felt with intensity IV in Kaunakakai and II-III in Volcano and Mountain View, Hawaii. Fifty earthquakes of M>=3 were found in the area of Hawaii today. There appears to be some migration from Kilauea especially to the west of this activity and this may reflect changes in magma load beneath the Island.

 

O: 28JUN2018 14:14:32  19.3N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 04:34:36  19.4N  155.0W Ml=3.2  EMSC   HAWAII REGION, HAWAII

O: 28JUN2018 04:39:11  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 07:09:32  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 07:10:10  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 08:21:56  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 11:08:38  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 11:38:20  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 12:35:21  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 12:41:18  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 13:57:15  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 14:39:42  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 01:05:15  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 03:41:06  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 05:13:43  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 05:16:02  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 05:26:55  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 07:15:25  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 07:42:52  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 08:25:10  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 10:25:36  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 11:43:59  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 13:31:59  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 14:16:21  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 14:45:26  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 07:51:27  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 09:22:44  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 06:11:58  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 07:13:52  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 12:43:15  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 12:46:59  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 14:11:26  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 14:35:25  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 14:41:14  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 04:15:53  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 05:11:06  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 05:24:08  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 07:36:30  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 09:20:21  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 12:13:36  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 13:59:49  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 29JUN2018 00:16:42  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 13:44:44  19.4N  155.3W ML=3.6  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 10:31:23  19.4N  155.3W ML=3.8  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 10:27:13  19.4N  155.3W ML=4.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 07:44:42  19.4N  155.3W ML=4.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 10:32:46  19.4N  155.3W Ml=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 14:48:50  19.4N  155.3W Mw=5.3  EMSC   ISLAND OF HAWAII, HAWAII     

P: 27JUN2018 117687    18.8N  155.2W 3.0-4.5 AAAAA  Hawaii                      

 

The strongest earthquakes in the U.S. or Canada outside Hawaii today continued in the Gulf of Alaska with events of M 3.8, 3.8 and 3.7 in the aftershock sequence there. This follows an uptick in the aftershocks in the area of the past four days. This included several events in the series of M 4.2. Forecast 117826 had expected this activity was likely around June 25.

 

O: 29JUN2018 02:23:13  56.1N  149.3W ML=3.8  EMSC   GULF OF ALASKA               

O: 28JUN2018 14:32:30  56.2N  149.3W ML=3.7  EMSC   GULF OF ALASKA               

O: 29JUN2018 05:57:40  56.5N  149.0W ML=3.8  EMSC   GULF OF ALASKA               

P: 25JUN2018 117826    55.9N  149.3W 3.5-5.0 AAAAA  Gulf of Alaska             

 

The strongest earthquake in the contiguous U.S. today was an M 3.2 in  Northern California in the Geysers area. This may have been affected by tidal stresses from the full moon which arrived today. The area is very sensitive to tidal effects. The tidal seismicity forecast in this summary had noted:

 

"The full moon will arrive at 04:53 UT on June 28, 2018. Longitudes where tidal stresses are greatest with this new moon are near 72W and 108E and include the eastern U.S., the Caribbean and western South America in the west and Southeast Asia Indonesia in the east. While tidal triggering is most likely in these regions with this new moon, it can occur in any area where tides mitigate seismicity." (June 26-29, 2018)

 

The last earthquake of M>=3.2 in the Geysers area occurred on May 10, 2018 with M 4.2 and prior to that an M 3.2 on April 21, 2018.  Forecast 117732 had expected this event within about 15 km of the epicenter around June 28.

 

NEIC reported this earthquake of M 3.2 in the Geysers, California with intensity II-III in the area(s) of Kelseyville, Geyserville, Middletown, Lakeport, Calistoga, Saint Helena, Santa Rosa and Yountville, California.

 

O: 28JUN2018 23:49:11  38.8N  122.8W ML=3.2  EMSC   NORTHERN CALIFORNIA          

O: 28JUN2018 16:23:32  38.8N  122.8W MD=2.0  EMSC   NORTHERN CALIFORNIA

O: 28JUN2018 17:46:56  38.8N  122.8W MD=2.2  EMSC   NORTHERN CALIFORNIA

O: 28JUN2018 10:11:45  38.8N  122.8W MD=2.4  EMSC   NORTHERN CALIFORNIA

P: 28JUN2018 117732    38.7N  122.7W 2.5-4.4 AAAAA  Central California         

 

QUIET GLOBAL SEISMICITY MAY BE ENTERING FINAL STAGES

 

EARTHQUAKE SUMMARY FOR JUNE 27, 2018

 

The very quiet seismic pattern in the world which has persisted since the eruption of Kilauea Volcano in Hawaii in early May may be in its final stages. Moderate earthquakes accompanying the full moon and the recent geomagnetic storm suggest enough seismic strain has now been built up to promote the occurrence of strong earthquakes in the near term. It will be noteworthy if a strong tidally triggered event occurs in the next several days or if Indonesia becomes active due to  geomagnetic effects.

 

The strongest earthquake in the world today was an M 5.4 in the Molucca Sea of Indonesia. It was not reported felt. Forecast 117643 expected this activity within about 50 km of this epicenter was likely around June 22-26. This is a typical response to strong geomagnetic storms such as has just occurred and may foreshadow larger regional seismicity in the near future.

 

O: 27JUN2018 06:44:21   0.6N  126.2E Mw=5.4  EMSC   MOLUCCA SEA                  

O: 27JUN2018 06:55:56   0.6N  126.3E mb=4.7  EMSC   MOLUCCA SEA                  

P: 22JUN2018 117643     1.0N  126.0E 4.0-5.6 BAAAA  Mindanao, Philippines      

P: 26JUN2018 117643     0.0N  125.0E 4.0-5.5 AAAAA  Mindanao, Philippines      

 

A strong eruption of Kilauea occurred today with associated magnitude of M 5.3. NEIC reported it was felt with intensity IV in Hawaii National Park, Volcano and II-III in Hilo, Papaikou, Pepeekeo, Kaunakakai, Kaneohe, Hawaii.

 

O: 28JUN2018 01:50:31  19.4N  155.3W MD=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 04:40:58  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 07:07:26  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 23:09:09  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 02:37:50  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 03:33:17  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 03:39:00  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 04:39:11  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 05:43:05  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 06:45:24  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 00:14:20  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 04:01:19  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 05:26:55  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 07:51:00  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 23:42:04  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 01:03:34  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 03:02:20  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 03:59:46  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 05:29:03  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 06:37:43  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 07:12:02  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 07:21:20  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 07:53:34  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 07:57:59  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 21:56:47  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 00:56:20  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 05:26:48  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 05:59:16  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 06:03:26  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 08:11:14  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 05:24:08  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 05:11:10  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 05:54:08  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 23:56:45  19.4N  155.3W ML=3.9  EMSC   ISLAND OF HAWAII, HAWAII

O: 28JUN2018 04:02:47  19.4N  155.3W ML=4.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 22:44:16  19.4N  155.3W Ml=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 27JUN2018 08:40:40  19.4N  155.3W Mw=5.3  EMSC   ISLAND OF HAWAII, HAWAII     

P: 27JUN2018 117687    18.8N  155.2W 3.0-4.5 AAAAA  Hawaii                     

 

Aftershocks also continued today after the M 5.5 in the Galapagos Islands yesterday. Like Hawaii, this is a major hot spot and may reflect similar seismicity response to changes in the earth as Hawaii. Forecast 117641 expected this activity in the Galapagos around June 27. These epicenters are located at the fifth node (72 degrees) from the January 23 M 8.0 in the Gulf of Alaska and were probably promoted from that source.

 

O: 27JUN2018 15:30:46   0.8S   91.1W ML=3.1  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 27JUN2018 13:27:40   0.8S   91.1W ML=3.2  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 27JUN2018 19:19:33   0.8S   91.1W ML=3.2  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 27JUN2018 11:23:29   0.8S   91.1W ML=3.3  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 28JUN2018 03:54:16   0.8S   91.1W ML=3.6  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 27JUN2018 16:18:54   0.9S   91.1W ML=3.0  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 27JUN2018 16:02:23   0.9S   91.1W ML=3.1  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 27JUN2018 21:12:10   0.9S   91.1W ML=3.7  EMSC   GALAPAGOS ISLANDS, ECUADOR   

P: 27JUN2018 117641     2.0N   91.0W 3.5-5.1 ACAAA  Galapagos Islands          

 

The strongest earthquake in the U.S. outside Hawaii today was an M 4.2 in the aftershock series following the Gulf of Alaska M 8.0 of January 23, 2018. It was not reported felt in this remote area. The last earthquake of M>4.2 within about 100 km of this epicenter was an  M 4.8 on June 17, 2018. Three events of M 4.2 have occurred in the area in the past two months. Forecast 117826 had expected this activity was likely around June 25.

 

O: 27JUN2018 21:35:25  55.5N  149.4W ML=3.0  EMSC   GULF OF ALASKA               

O: 27JUN2018 15:38:52  56.1N  149.2W mb=4.2  EMSC   GULF OF ALASKA               

P: 25JUN2018 117826    55.9N  149.3W 3.5-5.0 AAAAA  Gulf of Alaska             

 

GALAPAGOS REGION SEES SEISMIC SPIKE

 

EARTHQUAKE SUMMARY FOR JUNE 26, 2018

 

The most unusual earthquakes of the day occurred as a series in the Galapagos Islands of Ecuador. The largest of these was M 4.7-5.5 but the events suggested  yet another volcanic eruption could be in the works. Major eruption in  Guatemala, Chile and Hawaii continued. These may, in part, be responsible for the extreme global quiet in earthquakes which began with the eruption of Hawaii nearly two months ago.

 

Most of the activity in the Galapagos Islands occurred within minutes of local solar noon and was probably promoted by high tidal stresses associated with  the full moon as forecast in earlier issues of this summary:

 

"The full moon will arrive at 04:53 UT on June 28, 2018. Longitudes where tidal stresses are greatest with this new moon are near 72W and 108E and include the eastern U.S., the Caribbean and western South America in the west and Southeast Asia Indonesia in the east. While tidal triggering is most likely in these regions with this new moon, it can occur in any area where tides mitigate seismicity." (June 25-26, 2018)

 

Forecast 117641 had expected the Galapagos would be active around June 27. the last event in the Galapagos of M>=5.5 was an M 5.7 nearly 19 years ago on  December 22, 1999. The Galapagos are located at the fifth node (72 degrees) from the great Gulf of Alaska quake of January and may have been promoted from that source.

 

O: 26JUN2018 09:15:36   0.7S   91.0W mb=4.7  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 26JUN2018 19:22:12   0.8S   91.1W ML=3.2  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 26JUN2018 17:46:23   0.8S   91.1W ML=3.5  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 26JUN2018 09:10:24   0.8S   91.1W ML=3.6  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 26JUN2018 17:41:44   0.8S   91.1W ML=3.7  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 26JUN2018 18:06:29   0.8S   91.1W ML=3.8  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 26JUN2018 17:52:47   0.8S   91.1W ML=3.9  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 26JUN2018 18:08:07   0.8S   91.1W ML=3.9  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 26JUN2018 19:31:41   0.8S   91.1W ML=3.9  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 26JUN2018 18:04:33   0.8S   91.1W ML=4.0  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 26JUN2018 19:38:02   0.8S   91.1W ML=4.1  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 26JUN2018 18:01:30   0.9S   91.2W ML=3.6  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 26JUN2018 19:54:14   1.1S   91.0W ML=3.8  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 26JUN2018 17:50:13   1.4S   89.9W mb=4.5  EMSC   GALAPAGOS ISLANDS, ECUADOR

O: 26JUN2018 09:15:36   0.7S   91.0W mb=4.7  EMSC   GALAPAGOS ISLANDS, ECUADOR   

O: 26JUN2018 09:15:36   0.7S   91.0W mb=5.5  EMSC   GALAPAGOS ISLANDS, ECUADOR   

P: 27JUN2018 117641     2.0N   91.0W 3.5-5.1 ACAAA  Galapagos Islands          

 

A moderate earthquake also occurred  today as an M 5.2 in the area offshore Oaxaca, Mexico. This continues the strong aftershocks in the region. It occurred within about 10 minutes of local solar noon and may have been promoted by tidal stresses associated with the full moon. The only earthquake within about 100 km of this epicenter with M>=5.2 in the pat eight months was an M 5.5 on April 11, 2018. Forecasts 117681 had expected this activity was likely at the end of June.

 

NEIC reported this earthquake of M 5.2 in Oaxaca, Mexico was felt with intensity IV in Ishuatan, Oaxaca; IV in Antigua Guatemala, Sacatepequez and II-III in the area(s) of Chiapas, and Mexico City, Mexico and in Guatemala in Quezaltenango and Escuintla.

 

O: 26JUN2018 16:26:06  15.5N   94.8W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO      

O: 26JUN2018 18:02:21  15.8N   93.8W Mw=5.2  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 25JUN2018 117681    15.0N   95.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

P: 30JUN2018 117681    16.0N   95.0W 3.5-5.3 BAAAA  Chiapas, Mexico            

 

The strongest earthquake in the U.S. or Canada was an M 3.7 in the Unimak Island area of Alaska. This is the strongest earthquake in the Unimak area since an M 4.0 on June 15, 2018. It was not reported felt in the epicentral region. Forecast 117825 had expected this activity around June 25.

 

O: 26JUN2018 06:31:32  53.4N  163.5W ML=3.1  EMSC   UNIMAK ISLAND REGION, ALASKA 

O: 26JUN2018 09:09:15  53.8N  163.4W mb=3.7  EMSC   UNIMAK ISLAND REGION, ALASKA 

P: 25JUN2018 117825    53.9N  165.3W 3.5-5.0 AABAA  Fox Islands, Aleutians     

 

A series of moderate earthquakes also occurred in Japan today but none of these exceeded M 4.8. The region will probably see enhanced seismicity with the coming typhoon season.

 

O: 26JUN2018 05:58:40  29.2N  130.4E mb=4.8  EMSC   RYUKYU ISLANDS, JAPAN        

P: 28JUN2018 117710    29.0N  131.0E 4.0-5.4 AAAAA  Kyushu Japan               

 

O: 26JUN2018 08:00:12  34.9N  132.8E mb=4.6  EMSC   WESTERN HONSHU, JAPAN        

P: 26JUN2018 117747    35.0N  136.0E 3.5-5.1 AABAA  No. Honshu, Japan          

 

O: 26JUN2018 10:46:23  35.3N  140.3E Mw=4.3  EMSC   NEAR EAST COAST OF HONSHU, JAP

O: 26JUN2018 19:16:36  35.3N  140.5E mb=4.3  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 24JUN2018 117751    35.0N  141.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

NEIC reported this earthquake of M 4.3 in southeastern Honshu, Japan was felt with intensity II-III in the area(s) of Chiba and Tokyo Prefectures, Japan.

 

O: 26JUN2018 11:03:04  39.4N  142.0E mb=4.8  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 28JUN2018 117751    39.0N  141.0E 4.0-5.7 AAAAA  Off East Coast Honshu      

 

NEIC reported this earthquake of M 4.8 off northeastern Honshu, Japan  was felt with intensity II-III in the area(s) of Iwate, Ibaraki, Chiba, Saitama, Tokyo and Kanagawa Prefectures, Japan. An earlier event of M 4.3 was felt in a similar area today.

 

O: 26JUN2018 08:04:31  42.2N  143.4E mb=4.4  EMSC   HOKKAIDO, JAPAN REGION       

P: 27JUN2018 117784    42.0N  143.0E 3.5-5.6 AAAAA  Hokkaido, Japan            

 

RARE MODERATELY LARQE EARTHQUAKE IN SOUTH SANDWICH ISLANDS

 

EARTHQUAKE SUMMARY FOR JUNE 25, 2018

 

The strongest earthquake in the world today was an M 5.7 in the southern South Sandwich Islands. It was not reported felt in this remote area. This is the strongest earthquake in the southern South Sandwich Islands within about 200 km of this epicenter since an event of M 5.8-5.9 on March 9, 2006 more than 12 years ago. The only other such earthquakes in this area since 1990 occurred on June 15, 1995 (M 5.7) and October 5, 1997 (M 6.3).  This earthquake occurred within minutes of local solar midnight and was probably triggered by tidal stresses which maximize near this hour. Forecast 117899 had expected this earthquake in this area was likely around June 26.

 

O: 26JUN2018 01:48:40  59.5S   29.8W Mw=5.7  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 26JUN2018 117899    59.0S   26.0W 4.0-6.1 AABAA  So. Sandwich Islands       

 

A moderate earthquake of M 5.5 also occurred in Southern Greece today but was

not reported damaging. EMSC reported it was felt with moderate intensity in Greece at Pilos, Petalidi, Drakoneri, Kalamata, Skala and other communities within about 100 km of the epicenter. The last earthquake in this area of M>=5.5 was an M 5.6 on August 29, 2014. The last of significantly larger magnitude was an M 6.4 on October 12, 2013. Forecast 117746 had expected this earthquake was likely in this area around June 27.

 

O: 25JUN2018 05:14:45  36.7N   21.4E Mw=5.5  EMSC   SOUTHERN GREECE              

P: 27JUN2018 117746    36.0N   22.0E 3.0-4.5 AAAAA  No. Greece                 

 

Volcanism remained active throughout much of the world today after 10 days

of high activity. A series of earthquake in Guatemala was probably related to the current eruption of Fuego. In Ecuador a moderate quake may also have been associated with volcanism and moderate seismicity in the Galapagos occurred in association with the full moon.  A moderate eruption of Kilauea today with M 5.2 was felt with intensity V in Hawaii at Volcano and II-III in Hawaii National Park, Mountain View, Hilo, Papaikou, Kaunakakai, Kurtistown and Keaau, A number of smaller earthquakes were felt in the Volcano area of Hawaii today as well.

 

The forecast for tidal-related seismicity had read:

 

"The full moon will arrive at 04:53 UT on June 28, 2018. Longitudes where tidal stresses are greatest with this new moon are near 72W and 108E and include the eastern U.S., the Caribbean and western South America in the west and Southeast Asia Indonesia in the east. While tidal triggering is most likely in these regions with this new moon, it can occur in any areas where tides mitigate seismicity." (June 25, 2018)

 

O: 25JUN2018 21:24:30  19.2N  155.1W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 23:54:21  19.2N  155.5W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 12:20:29  19.4N  155.0W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 10:11:32  19.4N  155.3W MD=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 09:39:30  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 11:20:41  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 11:23:32  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 12:39:33  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 14:18:28  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 15:07:33  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 16:05:42  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 17:19:48  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 17:26:31  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 19:46:16  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 21:04:04  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 21:26:53  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 21:44:09  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 22:25:31  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 22:57:02  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 23:08:06  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 23:28:38  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 23:47:04  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 23:47:04  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 23:50:51  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 00:17:04  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 00:19:58  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 00:23:06  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 01:05:29  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 02:27:03  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 02:36:32  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 02:57:24  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 14:33:06  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 14:35:53  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 16:29:30  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 22:11:24  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 22:46:54  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 23:02:35  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 02:03:11  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 02:32:25  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 17:21:25  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 18:25:59  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 18:45:36  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 19:32:37  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 19:33:42  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 00:23:49  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 00:25:03  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 01:12:34  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 12:47:01  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 13:00:16  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 16:10:18  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 18:16:31  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 00:28:17  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 02:39:01  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 16:08:41  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 17:16:25  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 18:18:39  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 02:48:26  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 02:53:58  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 17:23:41  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 21:55:25  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 00:14:22  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 00:30:01  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 02:52:21  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 00:31:27  19.4N  155.3W ML=3.6  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 09:18:49  19.4N  155.3W ML=3.7  EMSC   ISLAND OF HAWAII, HAWAII

O: 25JUN2018 22:58:04  19.4N  155.3W Ml=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 26JUN2018 03:02:44  19.4N  155.3W Mw=5.2  EMSC   ISLAND OF HAWAII, HAWAII     

O: 25JUN2018 19:42:07  19.4N  155.3W mb=4.3  EMSC   ISLAND OF HAWAII, HAWAII     

P: 24JUN2018 117687    19.3N  155.3W 3.0-4.6 AAAAA  Hawaii                     

 

TIDES CONTINUE TO TRIGGER MAJOR KILAUEA ERUPTIONS

 

EARTHQUAKE SUMMARY FOR JUNE 15, 2018

 

A volcanic earthquake of M 5.3 occurred at Kilauea, Hawaii today. This event occurred within a few minutes of local solar noon and was probably triggered by tidal stresses which maximize at this hour. This summary had noted this likelihood in the previous issue as:

 

 

"Another M 5.3 eruption of Kilauea occurred today in Hawaii. NEIC reported it was felt with intensity V in Volcano and II-III in Hilo, Papaikou, Kaunakakai, Hawaii. Like the M 5.3 yesterday in Hawaii this earthquake occurred a few minutes after 13:00 UT (about 2-3 am local solar time). The events of M 5.3 on June 12 at 11:52 UT and M 5.3 on June 10 at 10:51 UT occurred an hour earlier at 11:52 UT and likewise could have been tidally triggered. The event on June 10 occurred within minutes of local solar midnight. Three of the other events in the eruption of M>=5.3 have occurred new local solar noon, another time when tidal stresses are maximized (see June 4, June 1 and May 4, 2018). All were possibly promoted by high astronomical tidal stresses which maximize near this time." (June 14-15, 2018)

 

Today's eruption of M 5.3 was reported with intensity V in Volcano, Hawaii and II-III in Kurtistown, Papaikou, Naalehu, Kaunakakai and Honolulu, Hawaii.

Many events of M>=2.5 were also felt during the eruption of Kilauea today.

More than 40 events of M>=3 were located in the area of Hawaii today.

 

O: 15JUN2018 17:05:17  19.4N  155.3W MD=3.7  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 09:19:16  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 10:56:49  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 09:28:27  19.6N  155.5W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII     

O: 15JUN2018 13:07:11  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 16:20:21  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 16:22:18  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 16:31:09  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 19:27:41  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 19:51:52  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 11:58:52  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 12:05:34  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 12:14:22  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 12:16:09  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 12:24:15  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 13:47:09  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 14:08:56  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 14:46:41  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 18:42:06  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 06:55:42  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 10:16:20  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 10:50:29  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 12:00:22  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 15:12:51  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 15:18:19  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 16:29:17  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 16:35:05  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 19:52:57  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 20:48:15  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 06:59:57  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 09:04:34  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 16:36:22  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 17:09:50  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 20:28:26  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 13:50:24  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 14:21:56  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 12:03:11  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 15:03:24  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 07:29:36  19.4N  155.3W ML=3.8  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 15:15:33  19.4N  155.3W ML=3.9  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 17:07:21  19.4N  155.3W ML=3.9  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 09:02:18  19.4N  155.3W ML=4.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 20:51:37  19.4N  155.3W ML=4.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 15JUN2018 21:56:39  19.4N  155.3W Mw=5.3  EMSC   ISLAND OF HAWAII, HAWAII     

P: 17JUN2018 117444    19.3N  155.2W 3.0-4.6 AAAAA  Hawaii                     

 

Outside Hawaii, seismicity in the U.S. and Canada was returning to active conditions today. Earthquakes of M>=4 occurred in the region of British Colombia, Canada (M 4.4); in Oklahoma (M 4.0); the Alaska Peninsula (M 4.6) and in the Fox Islands, Alaska (M 4.1, 4.1). None of these were reported felt in these remote areas. The most unusual of these was an M 4.4 off western Canada near Masset, B.C. The last event of M>4.4 in this area was an M 5.9 on January 31, 2013.  Forecast 117568 had expected this earthquake was likely within about 100 km of this epicenter around June 13. 

 

O: 15JUN2018 10:09:27  53.6N  134.3W ML=4.4  NRCA  147 km W   of Masset          

P: 13JUN2018 117568    53.0N  133.0W 3.0-5.0 AAAAA  British Colombia           

 

O: 16JUN2018 03:05:53  51.9N  169.6W mb=4.1  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 20JUN2018 117570    52.5N  169.2W 3.5-5.1 BAAAA  Fox Islands, Aleutians     

 

O: 15JUN2018 14:48:37  52.2N  171.2W ML=4.1  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 20JUN2018 117567    52.3N  171.3W 3.5-5.1 BAAAA  Andreanoff Isls, Aleutians 

 

The earthquake of M 4.6 in the Alaska Peninsula was the strongest within about 100 km of that epicenter since an M 4.6 on December 16. 2016. Forecast 117564 had expected today's activity south of this in the Alaska Peninsula around June 17.

 

O: 16JUN2018 02:52:03  56.3N  156.8W mb=4.6  EMSC   ALASKA PENINSULA             

P: 17JUN2018 117564    54.7N  156.9W 3.5-5.0 ABAAA  Alaska Peninsula           

 

NEIC reported an M 4.0 in Oklahoma was felt with intensity VI in Crescent, Oklahoma; V in Hennessey, Enid, Kingfisher and Oklahoma City and IV in Guthrie, Dover with lesser shaking in Edmond, Coyle, and within about 200 km of the epicenter in Oklahoma and Kansas. Forecast 117524 had expected this event was possible around June 17.

 

O: 15JUN2018 20:56:08  36.1N   97.6W Mw=4.0  EMSC   OKLAHOMA                     

O: 15JUN2018 21:09:59  36.1N   97.6W mb=2.7  EMSC   OKLAHOMA                      

P: 17JUN2018 117524    37.0N   97.0W 2.0-4.0 AAAAA  Southern Plains            

 

The strongest earthquake in the world today was an M 5.6 in Samoa. NEIC reported it was felt with intensity IV in Apia, Samoa and II-III in Samoa at Sili, Savaii, Saleilua and American Samoa. The last earthquake within about 200 km of this epicenter with M>=5.6 occurred on June 2, 2018, also with M 5.6. Prior to that an M 6.0 occurred on November 20, 2017 at shallow depth. Forecast 117599 had expected this earthquake in this area was likely around June 12.

 

O: 15JUN2018 13:18:53  15.4S  173.0W mb=5.6  EMSC   TONGA                        

P: 12JUN2018 117599    15.0S  175.0W 4.0-5.4 BABAA  Samoa Islands              

 

A moderate earthquake shook most of Taiwan today with M 5.2.  CWB reported the M 4.4 was felt with intensity II in Yilan County, Taiwan. The M 5.2 was felt with intensity IV in Yilan; III in Taipei, Hualien, Taoyuan Taichung; II in Hsinchu, Nantou, Miaoli, and I in Changhua, Chiayi, and Tainan Counties, Taiwan. This event may have been triggered by Tropical Storm Gaemi which had its eye over the epicenter at the time of the earthquake. The last earthquake in Taiwan with M>=5.2 occurred in February, 2018 as an aftershock of the M 6.1 and 6.4 of February 6 and 4, 2018.

 

"TS Gaemi (08W) continued today in the area east of Taiwan with winds up to 45 kts. It is expected to track along the same path as TS 07W affecting areas of the Ryukyu Islands seismicity in the next several days. An M 5.2 earthquake in Taiwan today was probably  triggered by stresses from this storm." (June 15, 2018)

 

Forecast 117473 had expected this earthquake was likely in Taiwan around June 14.

 

O: 15JUN2018 20:53:55  24.7N  121.8E ML=5.2  EMSC   TAIWAN                       

P: 14JUN2018 117473    24.0N  123.0E 4.0-5.5 AAAAA  Taiwan                     

 

Many of the readers of this summary are aware that it is commonly off-line from the middle to end of June. This is typically a quiet period in global seismicity and especially this year with the Hawaii eruption restraining the build up of seismic energy at specific sites. This is again the case this year. Summaries will not be available through the end of June, 2018. Check back with us around  June 27. For completeness, as in the past, daily summaries during the meantime will be produced for the missing period when the daily summaries resume. This typically means two or three summaries per day until the backlog is complete. In the meantime, enjoy the seismic quiet and join us again in about two weeks. Thank you for reading and your interest in seismology.