EARTHQUAKES COMMON AT NODAL, TRIGGERING DISTANCES FROM SO. PERU

 

EARTHQUAKE SUMMARY FOR JANUARY 15, 2018

 

A series of unusual earthquakes occurred today at distances from the M 7.1 in Peru which suggest strong distant triggering. The prime distances for these unusual events were, as expected, at 144 and 103 degrees where seismic energy is concentrated at the surface following reflection and refraction off core and core-mantle boundaries. The triggered events included an M 4.7 in the Arctic circle at 103 degrees from Peru and an M 4.6 in northeastern China at 144 degrees from Peru. Other unusual events at 103 degrees from Honduras included an M 4.8 and M 4.6 in Greece. The strongest earthquake in the U.S. or Canada also was included in this suite of events being 107 degrees from Peru.

 

An earthquake of M 4.7 in the Arctic north of Svalbard went unfelt in that remote area today. This event occurred at 103 degrees from the M 7.1 quake in Southern Peru yesterday and was likely promoted from that source. The last earthquake within about 250 km of this epicenter with M>=4.7 occurred as an M 4.7 on August 19, 2017 but the last of larger magnitude was an M 5.5 on May 17, 2009. Forecast 113722 had expected an event in this region around January 19. An earthquake of M 4.0 in Iceland southwest of the Svalbard epicenter was at 90 degrees (node 4) from Peru. Forecast 113716 had expected this event within about 50 km of the event was likely around January 16. 

 

O: 16JAN2018 03:14:06  82.8N    9.3W mb=4.7  EMSC   NORTH OF SVALBARD            

O: 16JAN2018 03:14:08  82.8N   10.3W mb=4.7  ANSS   NE of Nord Greenland

P: 19JAN2018 113722    79.0N    7.0E 4.0-5.6 BCBAA  Arctic Ocean Region        

 

O: 15JAN2018 09:39:48  64.6N   17.5W ML=4.0  EMSC   ICELAND                       

P: 16JAN2018 113716    65.0N   17.0W 3.0-4.5 AAAAA  Iceland area               

 

A moderate earthquake of M 4.1 shook the area of Portugal today. NEIC reported it was felt with maximum intensity V in Portugal at Unhos and IV in Caceres, Merida and Badajoz, Spain and IV in Sintra in the region of Lisbna and Vale do Tejo, Portugal. Lesser shaking was reported from Portugal at Coimbra, Mafra, Alges, Loures, Lisbon, Odivelas, Sacavem, Moscavide, Povoa de Santa Iria, Beja, Coruche and Evora, Portugal. This earthquake which occurred within about 30 minutes of local solar noon was probably promoted by high tidal stress associated with the new moon of January 17 as previously noted in this summary:

 

 

"The new moon will arrive at 02:17 UT on January 17. Longitudes experiencing maximum tidal stress at this time are near 35W and 145E longitudes. These are similar  to those of the new moon of January 2 which arrived at 02:24 UT. The same areas are likely to experience maximum stress with the new moon. These were noted in previous issues as:

 

"The full moon will arrive on January 2, 2018 at 02:24 UT. This is a supermoon with the moon at its closest  point in its orbit. Tidal effects are likely to be about 30% larger than with a normal full moon. Longitudes experiencing maximum tidal stresses at this time center about 20 degrees around 37W and 143E and include the mid-Atlantic and the east Pacific rim including New Guinea north to Honshu, Japan. These are most likely to see a strong tidally triggered earthquake in the next six days but tidal triggering is possible in many areas and is not limited to these longitudes." (January 2, 2018)" (January 13-14, 2018)

 

The longitude of this event in Portugal is the same as that of the Arctic  Ocean event earlier. The last earthquake in Portugal within about 200 km  of this epicenter with M>=4.6 occurred on October 2, 2008 about 200 km southeast of today's epicenter. This was the only such event in the area in the past 25 years. Forecast  113629 had expected this event was likely within about 25 km of this epicenter around January 17. 

 

O: 15JAN2018 11:55:15  38.8N    8.0W ML=2.5  EMSC   PORTUGAL                     

O: 15JAN2018 11:51:39  38.8N    8.0W mb=4.6  EMSC   PORTUGAL                     

P: 17JAN2018 113629    39.0N    8.0W 3.5-5.1 AAAAA  Morocco/Spain              

 

A pair of moderate events of M 4.3 and M 4.4 were also widely felt in central and southern Greece today.  NEIC reported this earthquake of M 4.3 in Greece was felt with maximum intensity V in Varnavas, Peuki, Akharnai, and Amarousion, Attiki, Greece and IV in Attiki at Pikermion, Pallini, Khalandrion, Vrilissia, Melissia, Marathon, Kapandrition, Anoixis, and Kifisia, and in general within about 50 km of the epicenter. An M 4.4 in the same area was felt with intensity II-IV in many of the same communities. The last events in this area within about 100 km of these epicenter with M>=4.4 occurred on December 31, 2017 with M 5.0. Forecast 113631 had expected this activity within about 150 km of these epicenters was likely around January 15. These epicenters are at 103-104 degrees from  Southern Peru and were probably promoted by that M 7.1 there by concentrated seismic energy.

 

O: 15JAN2018 19:27:17  37.7N   22.0E mb=4.4  EMSC   SOUTHERN GREECE              

O: 15JAN2018 20:24:14  38.1N   23.9E Mw=4.3  EMSC   GREECE                       

P: 15JAN2018 113631    39.0N   21.0E 3.0-4.7 AAAAA  No. Greece                 

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.9 in the Bering Sea of Alaska. It was not reported felt in that remote area. This is the strongest earthquake in this area within about 300 km of this epicenter since an M 4.9 on July 10, 2006. Two earthquakes have occurred in the area with M>4.9 during the past 25 years - an M 5.0 on August 9, 1996 and an M 5.2 aftershock on November 3, 1996. This epicenter is located at 107 degrees from the M 7.1 in southern Peru as was probably promoted by concentrated seismic energy from that event.

 

O: 16JAN2018 04:41:05  63.1N  172.4W mb=4.9  EMSC   BERING SEA                   

O: 16JAN2018 04:41:01  63.1N  172.5W Mb=4.9  ANSS   79km SSW of Gambell

 

While the M 4.9 in the Bering Strait, Alaska was the largest quake in the  U.S. or Canada today a series of moderate events in the Vancouver Island area made that the most active region today. These included an M 4.4 and two M 4.5 events. The M 4.4 occurred within about 15 minutes of local solar noon and was probably promoted by tidal effects which maximize at this hour.  The last earthquake of M>=4.5 in this region of Canada was an M 4.7 on November 21, 2017. Earthquakes in the area often follow strong nor'easters such as occurred last week. Forecast 113696 expected this event within about 50 km of these epicenters was likely around January 15.

 

O: 15JAN2018 11:57:22  50.5N  130.2W ML=3.5  NRCA  196 km W   of Pt. Hardy

O: 15JAN2018 11:44:04  50.5N  130.2W ML=3.5  NRCA  200 km W   of Pt. Hardy

O: 15JAN2018 07:09:42  50.5N  130.2W ML=3.6  NRCA  195 km W   of Pt. Hardy

O: 15JAN2018 05:38:43  50.5N  130.1W ML=4.0  NRCA  192 km W   of Pt. Hardy

O: 15JAN2018 02:50:19  50.5N  130.1W ML=3.2  NRCA  189 km W   of Pt. Hardy

O: 15JAN2018 02:16:22  50.5N  130.2W ML=3.9  NRCA  195 km W   of Pt. Hardy

O: 14JAN2018 20:25:35  50.4N  130.3W ML=4.4  NRCA  202 km W   of Pt. Hardy

O: 14JAN2018 19:22:46  50.5N  130.3W ML=3.6  NRCA  203 km W   of Pt. Hardy

O: 14JAN2018 19:10:52  50.5N  130.3W ML=4.5  NRCA  202 km W   of Pt. Hardy

O: 14JAN2018 18:54:01  50.5N  130.3W ML=4.5  NRCA  204 km W   of Pt. Hardy

O: 14JAN2018 17:25:19  50.5N  130.3W ML=3.9  NRCA  203 km W   of Pt. Hardy       

P: 15JAN2018 113696    50.4N  130.2W 3.0-5.1 AAAAA  British Colombia           

 

An unusual earthquake of M 4.7 hit northeastern China near Helongjiang today. It was not immediately reported felt in the region. This epicenter is located at 144 degrees from southern Peru, a distance at which seismic energy concentrates at the surface following large earthquakes. This may have helped promote this event in China. Forecast 113673 had expected a regional event in NE China between January 14 and 18. The last earthquake within about 250 km of this epicenter with M>=4.7 occurred on January 1, 2016 with M 5.7 and prior to that on November 19, 2013 (M 4.8). Two other such events have hit the area in the

past 25 years - an M 6.4 on September 15, 2002 and an M 4.8 on October 1, 1993.

 

O: 15JAN2018 09:06:01  46.6N  129.6E mb=4.7  EMSC   HEILONGJIANG, CHINA          

P: 14JAN2018 113673    41.0N  129.0E 3.5-5.5 ACAAA  NE China                   

P: 18JAN2018 113673    45.0N  124.0E 3.5-5.6 BBCAA  NE China                   

 

MODERATELY STRONG QUAKE IN NEW GUINEA

 

EARTHQUAKE SUMMARY FOR JANUARY 14, 2018

 

The strongest earthquake in the world today occurred in New Guinea with M 5.5. NEIC reported it was felt with intensity II-III in Papua New Guinea in Madang, Kainantu, Eastern Highlands, Wewak, East Sepik and Lae, Morobe, Papua New Guinea. Like earthquakes of M 7.1 in Southern Peru early on January 14 and a pair of moderate quakes in the Manila, Philippines area of M 5.2 and 5.0 late on January 14, this epicenter in New Guinea lies near the geomagnetic equator and may have been promoted by the geomagnetic storm early on the morning of January 14, the strongest in nearly a month. This event may also have been promoted by strong tidal stresses with the new moon which were expected to reach maximum strength at this longitude as previously noted in this summary:

 

"The new moon will arrive at 02:17 UT on January 17. Longitudes experiencing maximum tidal stress at this time are near 35W and 145E longitudes. These are similar  to those of the new moon of January 2 which arrived at 02:24 UT. The same areas are likely to experience maximum stress with the new moon. These were noted in previous issues as:

 

"The full moon will arrived on January 2, 2018 at 02:24 UT. This is a supermoon with the moon at its closest  point in its orbit. Tidal effects are likely to be about 30% larger than with a normal full moon. Longitudes experiencing maximum tidal stresses at this time center about 20 degrees around 37W and 143E and include the mid-Atlantic and the east Pacific rim including New Guinea north to Honshu, Japan. These are most likely to see a strong tidally triggered earthquake in the next six days but tidal triggering is possible in many areas and is not limited to these longitudes." (January 2, 2018)" (January 13-14, 2018)

 

The last earthquake with M>=5.6 within about 200 km of this epicenter occurred on November 7, 2017 (M 6.5) and June 2, 2017 (M 5.9), the only such events  in the area in nearly two years. An M 6.1 hit the region on April 1, 2016, the strongest at that time since December, 2014.  Forecast 113564 had expected this event within about 100 km of the epicenter was likely around January 13.

 

 

O: 14JAN2018 21:54:36   4.8S  144.9E Mw=5.6  EMSC   NEAR N COAST OF NEW GUINEA, PN

P: 13JAN2018 113564     4.0S  144.0E 4.0-5.4 AAAAA  Papua New Guinea           

 

 

The M 7.1 in Southern Peru early on January 14 occurred with the strongest geomagnetic storm since December 17, nearly a month. The KP (3-hour average) reached 5 at 0300 to 0600 UT for the first time since December 17. The earthquake in Peru occurred on the geomagnetic equator in an area commonly triggered by strongly changing geomagnetic conditions. It is likely that this quake was promoted by the geomagnetic storm which preceded and accompanied it.

 

CSN reported this earthquake was felt with intensity IV in  Arica, Codpa, Cuya, III Pocon Chile, Huara, La Tirana; II Camina, Felt in Chile at Arica, Parinacota and Tarapaca. Forecast 113734 expected this earthquake within about 50 km of the epicenter was likely around January 16.

 

O: 14JAN2018 09:18     15.9S   74.5W mb=7.0  GUC    Arica, Codpa, Cuya, III Pocon

P: 16JAN2018 113734    16.0S   74.0W 4.0-5.5 AAAAA  So. Peru/Bolivia           

 

Two moderate earthquakes of M 5.2 and 4.9 also shook central Philippines today.

The M 5.1 was reported by NEIC to have been felt with intensity II-III in Southern Tagalog at Sabang, Santa Clara, Tagaytay, Lipa, San Pedro, Kanluran, Santa Rosa, Binan, Pinamalayan, Bacoor, Manila, Tanza, Olongapo and Gapan, in Central Luzon. A foreshock of M 4.9 was felt with intensity II in Bacoor, Southern Tagalog, Philippines. PHIVOLCS reported the M 5.0 was felt with intensity IV in Abra de Ilog, Occidental Mindoro; III in Sablayan, Occidental Mindoro; II in Pola, Oriental Mindoro; Quezon City; Pasay City; Malolos, Bulacan and I in Coron, Palawan, Philippines. The M 5.2 was felt with intensity IV in Paluan and Mamburao, Occiden tal Mindoro; III in Quezon City, Tagaytay City; II in Manila; Calatagan Batangas and I in Nasugbu, Batangas, Philippines.

These earthquakes occurred within about 30 minutes of local solar midnight, a time when tidal stresses are maximized. It also occurred in combination with the strongest geomagnetic storm in the past month. As this epicenter, like that in southern Chile is located at the geomagnetic equator, it is likely that it was promoted by this geomagnetic storm. These epicenters are located at 143 degrees from the event north of Honduras of January 10 and had been expected in previous issues of this summary as.

 

"The two major distances where seismic energy is concentrated following major earthquakes are about 100-108 degrees and 142-146 degrees. Some seismic areas at these distances from Honduras include Myanmar, the Philippines, and western New Guinea at 144 degrees and North Island, New Zealand, Tonga-Fiji, Iran-Iraq and eastern Turkey and Hokkaido and the southern Kuril Islands in  the 103 degree range. These are areas where strong earthquakes may be triggered in the next several weeks. The timing of this series within about an hour of  local solar noon suggests a contribution to the triggering of these events came from high tidal stresses which maximize near this hour." (January 11, 2018)

 

O: 14JAN2018 15:20:24  13.2N  120.2E MS=5.0  PHI  Felt with intensity IV

O: 14JAN2018 15:49:23  13.3N  120.3E MS=5.2  PHI  Felt with intensity IV

O: 14JAN2018 15:20:28  13.5N  120.6E mb=4.9  EMSC   MINDORO, PHILIPPINES         

O: 14JAN2018 15:49:24  13.5N  120.6E mb=5.1  EMSC   MINDORO, PHILIPPINES         

P: 14JAN2018 113582    14.0N  122.0E 3.5-5.1 AABAA  Luzon, Philippines         

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 reported by  Earthquakes Canada near Port Hardy in the Vancouver Island area. Earthquakes Canada also reported an M 4.2 foreshock. No damage was reported and none was expected. The last earthquake of M>=4.5 in this region of Canada was an M 4.7 on November 21, 2017. Earthquakes in the area often follow strong nor'easters such as occurred last week. Forecast 113696 expected this event within about 50 km of these epicenters was likely around January 15.

 

O: 14JAN2018 19:10:55  50.7N  129.9W mb=4.3  EMSC   VANCOUVER ISLAND, CANADA REGIO

O: 14JAN2018 20:25:39  50.8N  129.7W mb=4.0  EMSC   VANCOUVER ISLAND, CANADA REGIO

O: 14JAN2018 18:54:06  50.8N  129.7W mb=4.2  EMSC   VANCOUVER ISLAND, CANADA REGIO

O: 14JAN2018 18:54:06  50.8N  129.7W mb=4.5  NRCA   VANCOUVER ISLAND, CANADA REGIO

P: 15JAN2018 113696    50.4N  130.2W 3.0-5.1 AAAAA  British Colombia           

 

The largest earthquake in the U.S. today was an M 3.7 in Southern California. This is north of the Landers region where a major quake hit in 1992 and another quake is considered possible in this region. The area may be reaching high stress levels again. The M 3.7 occurred within about 30 minutes of local solar noon and was probably promoted by high tidal stresses associated with the upcoming new moon. The last earthquake within about 50 km of this epicenter with M>=3.7 occurred on February 23, 2016 nearly two years ago with M 4.1. Forecast 113644 had expected this event was likely within about 10 km of this epicenter around January 17.  Southern California is currently experiencing large mud slides which have been deadly. A moderate quake in the area at this time would exacerbate this problem. Moderate to strong earthquakes in Southern California are not uncommon in mid-January and may be promoted by tropical cyclones in the southern Indian Ocean along with seasonal regional weather patterns. The current series of moderate quakes in California is expected to continue. Portions of  the State are at distances from the M 7.1 in Peru today where seismic activity is likely to be promoted from that source.

 

NEIC reported this earthquake of M 3.7 in Southern California was felt with intensity II-III in the area(s) of Ludlow, Landers, Apple Valley and Hesperia, California.

 

O: 14JAN2018 22:57:05  34.8N  116.1W ML=2.1  EMSC   SOUTHERN CALIFORNIA          

O: 14JAN2018 19:56:11  34.8N  116.1W Mw=3.7  EMSC   SOUTHERN CALIFORNIA          

P: 17JAN2018 113644    34.7N  116.1W 2.5-4.4 BAAAA  So. California             

 

STRONG EARTHQUAKE STRIKES SOUTHERN PERU

 

EARTHQUAKE SUMMARY FOR JANUARY 13, 2018

 

A major earthquake of M 7.1 hit the area of south-Central Peru today. It caused major damage at Acari, Arequipa where intensity IX was reported by NEIC.  Damage at intensity VII was also reported from Nazca, Ica, Peru with intensity VI at Coracora, Ayacucho and Vista Alegre, Ica, Peru and within about 200 km of the epicenter. Shaking at IV-V levels was relt in Ica, at Ica, Los Aquijes, Santiago, Puquio; in Arequipa at Arequipa about 350 km from the epicenter; in the Lima Provinces at Quilmana, Mala, Chilca, Chosica. Lesser shaking of intensity II-III was felt within about 500 km of the epicenter including at Ayacucho, Chincha Alta, Mollendo, San Vicente de Canete, Cusco, Matucana, Nicolas de Pierola, San Luis, Santa Maria, Lima. It was also felt in Arica and Tarapaca, Chile with light intensity around 600 km from the epicenter. It is likely this earthquake was promoted by tidal stresses associated with the upcoming new moon as well as by stress redistribution following the M 7.6 north of Honduras on January 10. The last earthquake of M>=7.1 in southern Peru within  about 300 km of this epicenter occurred on August 15, 2007 more than 10 years

ago with M 8.0. Other events of M>=7.1 occurred June 23, 2001 (M 8.4) and November 12, 1996 (M 7.7). Forecast 113734 had expected a moderate earthquake within about 50 km of this event was likely around January 16.

 

O: 14JAN2018 09:18:45  15.7S   74.6W Mw=7.1  EMSC   NEAR COAST OF SOUTHERN PERU  

P: 16JAN2018 113734    16.0S   74.0W 4.0-5.5 AAAAA  So. Peru/Bolivia           

 

The second largest earthquake of the day was an M 5.4 in Hindu Kush, Afghanistan. This event occurred within about an minute following the quake in Chile. The timing is suspicious but classical seismic energy from Chile would not have had time to help promote the Hindu Kush earthquake. It is possible that an unknown external stress at this time helped promote both earthquakes, as well as an unusual M 4.0 at the same time in Hungary. The event in Hindu Kush was lightly felt throughout the area. The last event of M>=5.4 in Hindu Kush within about 200 km of this epicenter was an M 6.6 on April 10, 2016. Forecast 113624 had expected this earthquake within about 50 km of the epicenter was likely around January 17. This earthquake is located at 143 degrees from the M 7.1 in Peru less than a minute earlier, a distance where triggering is considered likely. But the relation between these two earthquakes remains unclear. It is more likely that this event was promoted by seismic energy from the Honduras earthquake as it occurred at 120 degrees (node 3) from that event.

 

O: 14JAN2018 09:19:29  36.5N   70.8E Mw=5.4  EMSC   HINDU KUSH REGION, AFGHANISTAN

P: 17JAN2018 113624    36.0N   71.0E 3.8-5.4 AAAAA  Hindu Kush/Pakistan        

 

Activity at nodal or triggering distances from Peru and Honduras occurred as moderate quakes in Hindu Kush (144 degrees from Peru and 120 - node 3 – from Honduras); Myanmar (144 degrees); Ceram, Indonesia (146 degrees); Hungary (103 degrees from Peru); Fiji/Tonga (103 degrees from Honduras). 

 

STRONG QUAKE IN SOLOMON ISLANDS

 

EARTHQUAKE SUMMARY FOR JANUARY 12, 2018

 

A strong earthquake of M 5.9 occurred today in the Solomon Islands of the Southwest Pacific. This event was not reported felt in this remote area. It is the strongest event within about 200 km of this epicenter since an M 6.5 a year ago on January 19, 2017. Both may be aftershocks of an M 7.8 which hit near today's epicenter on December 8, 2016. Forecast 113739 had expected this earthquake was likely in this area around January 14. As this event occurred within about an hour of local solar midnight it may have been promoted by strong tidal stresses.

 

O: 13JAN2018 11:24:34  11.1S  163.0E Mw=5.9  EMSC   SOLOMON ISLANDS              

P: 14JAN2018 113739    11.0S  161.0E 4.0-5.6 AABAA  Vanuatu Islands            

 

The second strongest earthquake in the world and the strongest in the U.S. or

Canada today was an M 5.2 in the Rat Islands, Aleutians, Alaska. It was not reported felt in this remote epicentral area. The last earthquake in the Rat Islands with M>=5.2 within about 150 km of this epicenter occurred on April 27, 2017 with M 5.7. An M 6.6 hit about 125 km northwest of this on October 8, 2017.

Forecast 113705 had expected this event within about 25 km was likely around January 12.

 

 

O: 13JAN2018 01:35:21  51.8N  178.1E mb=5.2  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 13JAN2018 01:35:21  51.8N  178.0E mb=5.2  ANSS   Little Sitkin Island Alaska

P: 12JAN2018 113705    52.0N  178.0E 4.0-5.6 AAAAA  Rat Islands                

 

Seismicity also continued in areas which are at distances where promotion from  the Honduras M 7.6 of January 10 might be expected. These include continuing activity in Myanmar (M 4.8) and Ceram, Indonesia (M 4.2) at 144 degrees; an M 4.9 in Kyushu, Japan (120 degrees, node 3); Iran-Iraq (108 degrees). The strongest activity of the day, however was not at expected distances from Honduras.

MYANMAR M 6.0 QUAKE AT 144 DEGREES FROM HONDURAS

 

EARTHQUAKE SUMMARY FOR JANUARY 11, 2018

 

A series of moderate to strong earthquakes occurred today at distances near

103 and 144 degrees of the M 7.6 north of Honduras of January 10. This was expected in previous issues of this summary. The strongest events of the day were at 103 degrees (Fiji M 5.5) and 144 degrees (Myanmar M 6.0). This strongly suggests triggering from the Honduras event. While the Myanmar and Fiji events were the most prominent examples of distant triggering today other events at 144  degrees from Honduras occurred as an M 4.6 in Molucca, Indonesia, Banda Sea, 

and at 103 degrees in North Island, New Zealand (M 4.5), and north of the Loyalty Islands (M 4.6) and in the Iran-Iraq border region (M 5.4, 5.4, 5.0 ...).

 

A strong earthquake of M 6.0 occurred in Myanmar (Burma) today and was followed by a series of moderate aftershocks. The mainshock was reported by NEIC to have been felt with maximum intensity VI in Toungoo, Bago and V in Pyu, Myanmar and V in Pyinmana, Mandalay, Lesser shaking of II-III was felt in Myanmar at Nyaynglebin, Tharrawaddy, Bago, Kyoto, Rangoon, Syriam, Loikaw, Thaton, Myanmar and in Thailand at Mae Ramat, Pa Sang, Chiang Mai, Maetaeng, Sansai, Mae Sot, Sankamphaeng, Lampang, Bangkok and Selaphum. Moderate aftershocks were reported felt with intensity II-III in Byay and Bago, Myanmar. Some were also felt with intensity III in Thailand at Chiang Mai. This activity is located at 144 degrees from the M 7.6 north of Honduras of two days ago. This is a distance at which seismic energy returns to the surface in a concentrated form after reflections and refractions off the core-mantle boundary of seismic waves. This distance relation also led this summary to include Myanmar in a list of possible large upcoming events in the previous issue as follows: As most of this activity centered around local solar midnight, it is likely that it was promoted by strong tidal stresses as well.

 

"... major events is often seen. The two major distances where seismic energy is concentrated following major earthquakes are about 100-108 degrees and 142-146 degrees. Some seismic areas at these distances from Honduras include Myanmar, the Philippines, and western New Guinea at 144 degrees and North Island, New Zealand, Tonga-Fiji, Iran-Iraq and eastern Turkey and Hokkaido and the southern Kuril Islands in the 103 degree range. These are areas where strong earthquakes may be triggered in the next several weeks." (January 10-11, 2017)

 

The mainshock occurred within about half an hour of local solar midnight and was probably promoted by high tidal stresses which maximize at this hour. The last earthquake of M>=6.0 within about 150 km of this epicenter in Myanmar occurred on  nearly 15 years ago when an M 6.6 hit about 150 km northwest of this on September 21, 2003. Other regional events in the past 25 years of M>=6 occurred on November 11, 1996 and May 16, 1995 both with M 6.0. Forecast 113600 had expected this event was likely in this area around January 17.

 

 

O: 11JAN2018 22:30:47  18.4N   96.1E mb=4.3  EMSC   MYANMAR

O: 11JAN2018 18:42:58  18.4N   96.1E mb=5.2  EMSC   MYANMAR

O: 11JAN2018 18:43:59  18.4N   96.1E mb=5.2  EMSC   MYANMAR

O: 11JAN2018 18:38:12  18.4N   96.2E mb=5.3  EMSC   MYANMAR

O: 12JAN2018 04:16:03  18.5N   96.2E mb=4.4  EMSC   MYANMAR

O: 11JAN2018 20:08:40  18.5N   96.2E mb=4.6  EMSC   MYANMAR

O: 11JAN2018 18:26:24  18.4N   96.1E mw=6.0  ANSS   WSW of Pyu Burma

O: 11JAN2018 18:26:24  18.4N   96.1E Mw=6.0  EMSC   MYANMAR                       

P: 17JAN2018 113600    20.0N   96.0E 4.0-5.4 CBAAA  Myanmar                    

 

An unusual earthquake in the Caribbean Sea of M 2.8 may have been a direct result of regional stress redistribution from the event of M 7.6 north of Honduras. While it was not felt, the epicenter of this event is far to the south of normal seismicity in the region. The last event of M>=2.8 south of 17 North latitude in this region was an M 3.3 on October 31, 2008 but no such events have been  recorded within about 100 km of this epicenter in at least 25 years. This could suggest further unusual Caribbean activity is on the way.

 

O: 11JAN2018 17:44:48  16.4N   65.2W ML=2.8  EMSC   CARIBBEAN SEA                

P: 12JAN2018 113581    18.0N   64.0W 3.0-5.1 ABAAA  Leeward Islands            

 

This summary has been following a series of moderate earthquakes in Costa Rica which began about the same time as the M 7.6 north of Honduras. This series reached maximum intensity today with a series of moderate events centering near local solar noon. It included events of M 4.9 and 5.0. The timing suggests it may have been promoted by high tidal stresses which maximize near this hour. It may also have been promoted by regional stress redistribution following the event near Honduras. The last event within about 100 km of this epicenter with M>=5 in Costa Rica was an M 5.1 on July 3, 2016. An M 6.5 hit about 150 km southeast of this on November 13, 2017. Forecast 113573 had expected this earthquake was likely around January 15 within this region.

 

NEIC reported this earthquake of M 5.0 in Costa Rica was felt with Maximum intensity IV in Upala, Alajuela, Costa Rica and intensity II-III in the area(s) of Guanacaste, Alajuela and Puntarenas, Costa Rica.  NEIC reported this earthquake of M 4.9 in Costa Rica was felt with intensity II-III in the area(s) of Costa Rica at Tilaran and Jaco.

 

O: 11JAN2018 16:00:26  10.6N   85.0W mb=4.6  EMSC   COSTA RICA

O: 11JAN2018 19:57:22  10.7N   84.9W mb=4.9  EMSC   COSTA RICA

O: 11JAN2018 17:09:30  10.7N   85.0W ML=4.0  EMSC   COSTA RICA

O: 11JAN2018 17:58:30  10.7N   85.0W ML=4.0  EMSC   COSTA RICA

O: 12JAN2018 00:36:30  10.7N   85.0W ML=4.4  EMSC   COSTA RICA

O: 11JAN2018 16:04:30  10.7N   85.0W ML=4.6  EMSC   COSTA RICA

O: 11JAN2018 17:03:18  10.6N   84.9W mb=5.0  EMSC   COSTA RICA                   

P: 15JAN2018 113573    10.0N   84.0W 3.5-5.1 BAAAA  Caribbean Sea              

 

The second strongest earthquake of the day was an M 5.4-5.5 in the region south of Fiji. This region had also been included in the areas most likely promoted by the Honduras earthquake (see above) because it is in the area  near 103 degrees from that epicenter. An earthquake north of North Island, New Zealand of M 4.5 joined this Fiji event at 103 degrees from Honduras.  GEONET reported this earthquake was felt with light intensity northeast of North Island. 3 people reported feeling this earthquake with weak intensity. The Fiji event was not reported felt. The last earthquake in the area south  of Fiji with M>=5.5 within about 100 km of this epicenter was an M 5.9 on October 18, 2016. Forecast 113519 had expected this event was likely to the east in early January. Both were probably promoted by concentrated seismic energy from Honduras.

 

O: 11JAN2018 17:53:32  24.1S  180.0W Mw=5.5  EMSC   SOUTH OF FIJI ISLANDS        

O: 11JAN2018 17:53:33  23.9S  180.0E mw=5.5  ANSS   the Fiji Islands

P:  3JAN2018 113519    24.0S  178.0W 4.0-5.6 CABAA  Tonga Islands              

 

O: 11JAN2018 04:11:45  37.4S  179.1E ML=4.5  GEONET North Island, New Zealand    

P:  9JAN2018 113524    37.0S  177.0E 3.0-4.6 AABAA  North Island, N.Z.         

 

The extraordinary swarm of moderate to moderately large quakes along the Iran-Iraq border also continued today. The largest events in the area today included an M 5.4, 5.4 and 5.0. The previous summary had discussed this swarm as:

 

"A series of moderately large earthquakes along the Iran-Iraq border east of Baghdad was felt with maximum intensity IV in Ba'qubah, Iraq. These were felt throughout much of eastern Iraq as far as about 200 km from the epicenter including in Iran at Orumiyeh and Sannandaj, Kordestan. A foreshock of M 4.6 was reported by NEIC to have been felt with intensity III in Aslamabad, Kermanshah, Iran. This series was probably triggered by seismic energy from the M 7.6 north of Honduras which occurred yesterday. They lie at 108 degrees from the epicenter of that great shock, a distance at which seismic energy reflected and refracted off the core-mantle boundary concentrates on the surface of the earth. This  is the distance at which strong triggering of seismicity from distant major events is often seen. ...

 

The last earthquakes of M>=5.5 along the Iran-Iraq border within about 100 km

of today's swarm occurred as an M 5.6 on November 22, 2013. An M 7.3 hit about

150 km north of this epicenter on November 12, 2017 and may have helped promote the earthquake of M 7.7 in Honduras on January 10, 2018 as it lies at 108 degrees from that event. Forecasts 113413 and 113648 had expected today's activity was likely in early January within this distance range. These earthquakes are at 141 degrees from the M 6.8 in Tonga of November 4, 2017 and may have been promoted from that source." (January 10-11, 2018)

 

This activity centered around local solar noon and was likely promoted by tidal effects which maximize at this hour. Once noon had passed the activity quickly quieted.  NEIC reported this earthquake of M 4.6 in Iraq was felt with intensity II-III in the area(s) of Iraq at Baghdad and Irbil. An M 5.4, the last of the moderately strong quakes in the area today was reported felt with intensity IV in Irbil and II-III in Baghdad, ad-Dujayl, al-Kut, Iraq.

 

 

 

O: 11JAN2018 07:52:46  33.6N   45.6E mb=4.3  EMSC   IRAN-IRAQ BORDER REGION

O: 11JAN2018 21:50:44  33.6N   45.8E mb=4.6  EMSC   IRAN-IRAQ BORDER REGION

O: 11JAN2018 07:37:07  33.7N   45.6E mb=4.3  EMSC   IRAN-IRAQ BORDER REGION

O: 11JAN2018 13:16:40  33.7N   45.6E mb=4.5  EMSC   IRAN-IRAQ BORDER REGION

O: 11JAN2018 20:19:41  33.7N   45.7E ML=4.0  EMSC   IRAN-IRAQ BORDER REGION

O: 11JAN2018 13:30:47  33.7N   45.7E mb=4.1  EMSC   IRAN-IRAQ BORDER REGION

O: 11JAN2018 07:54:59  33.7N   45.8E mb=5.0  EMSC   IRAN-IRAQ BORDER REGION

O: 11JAN2018 08:00:39  33.7N   45.8E mb=5.4  EMSC   IRAN-IRAQ BORDER REGION

O: 11JAN2018 09:32:26  33.8N   45.6E mb=4.4  EMSC   IRAN-IRAQ BORDER REGION

O: 11JAN2018 07:21:43  33.3N   46.5E mb=5.4  EMSC   IRAN-IRAQ BORDER REGION      

P: 14JAN2018 113648    34.0N   49.0E 3.8-5.2 BABAA  So. Iran                   

 

GLOBAL SEISMICITY INCREASES FOLLOWING MAJOR CARIBBEAN QUAKE

 

EARTHQUAKE SUMMARY FOR JANUARY 10, 2018

 

A series of moderately large earthquakes along the Iran-Iraq border east of Baghdad was felt with maximum intensity IV in Ba'qubah, Iraq. These were felt throughout much of eastern Iraq as far as about 200 km from the epicenter including in Iran at Orumiyeh and Sannandaj, Kordestan. A foreshock of M 4.6 was reported by NEIC to have been felt with intensity III in Aslamabad, Kermanshah, Iran. This series was probably triggered by seismic energy from the M 7.6 north of Honduras which occurred yesterday. They lie at 108 degrees from the epicenter of that great shock, a distance at which seismic energy reflected and refracted off the core-mantle boundary concentrates on the surface of the earth. This  is the distance at which strong triggering of seismicity from distant major events is often seen. The two major distances where seismic energy is concentrated following major earthquakes are about 100-108 degrees and 142-146 degrees. Some seismic areas at these distances from Honduras include Myanmar, the Philippines, and western New Guinea at 144 degrees and North Island, New Zealand, Tonga-Fiji,

Iran-Iraq and eastern Turkey and Hokkaido and the southern Kuril Islands in  the 103 degree range. These are areas where strong earthquakes may be triggered in the next several weeks. The timing of this series within about an hour of  local solar noon suggests a contribution to the triggering of these events came from high tidal stresses which maximize near this hour.

 

The last earthquakes of M>=5.5 along the Iran-Iraq border within about 100 km of today's swarm occurred as an M 5.6 on November 22, 2013. An M 7.3 hit about  150 km north of this epicenter on November 12, 2017 and may have helped promote the earthquake of M 7.7 in Honduras on January 10, 2018 as it lies at 108 degrees from that event. Forecasts 113413 and 113648 had expected today's activity was likely in early January within this distance range. These earthquakes are at 141 degrees from the M 6.8 in Tonga of November 4, 2017 and may have been promoted from that source.

 

O: 11JAN2018 06:59:30  33.8N   45.7E mb=5.5  EMSC   IRAN-IRAQ BORDER REGION      

O: 11JAN2018 07:14:16  33.9N   45.8E Mw=5.2  EMSC   IRAN-IRAQ BORDER REGION      

O: 11JAN2018 07:22:01  34.0N   45.6E ML=5.4  EMSC   IRAN-IRAQ BORDER REGION      

O: 10JAN2018 15:56:29  34.5N   46.9E ML=4.7  EMSC   WESTERN IRAN                 

P:  3JAN2018 113413    33.0N   46.0E 3.8-5.5 CBAAA  So. Iran                    

P: 14JAN2018 113648    34.0N   49.0E 3.8-5.2 BABAA  So. Iran                   

 

O: 10JAN2018 17:10:53  30.8N   57.4E ML=4.1  EMSC   EASTERN IRAN                 

O: 11JAN2018 03:18:33  30.8N   57.4E mb=4.9  EMSC   EASTERN IRAN                  

P:  1JAN2018 113413    31.0N   57.0E 3.8-5.2 CAAAA  So. Iran                   

 

An earthquake in Hokkaido, Japan also occurred today at 107 degrees from the M 7.6 in Honduras.  This earthquake of M 4.7 is the largest in Hokkaido since an M 5.0 on December 28, 2017 and before that on December 1, 2017 (M 5.1). Forecast 113665 had expected this event within about 75 km of the epicenter was likely around January 13.

 

O: 10JAN2018 11:03:28  42.5N  142.4E mb=4.7  EMSC   HOKKAIDO, JAPAN REGION       

P: 13JAN2018 113665    42.0N  143.0E 3.5-5.6 BAAAA  Hokkaido, Japan            

 

The other distance at which strong concentration of seismic energy occurs after major earthquakes is near 144 degrees. An M 4.6 occurred in the Molucca Sea today at 144 degrees from Honduras and was probably promoted from that event.  Forecast 113547 expected this event was likely around January 13.

 

O: 10JAN2018 11:40:56   2.3N  126.9E mb=4.8  EMSC   MOLUCCA SEA                  

P: 13JAN2018 113547     1.0N  126.0E 4.0-5.5 BBAAA  Mindanao, Philippines      

 

MAJOR EARTHQUAKE HITS NORTH OF HONDURAS

 

EARTHQUAKE SUMMARY FOR JANUARY 9, 2018

 

A major earthquake of M 7.6 hit north of Honduras today. This is the largest earthquake in the world in the four months since the M 8.2 in Chiapas, Mexico of September 8, 2017. This event may have caused a tsunami as receding sea levels were observed in some areas, but at this time PTWC has cancelled the tsunami threat warning. The tectonics which are largely horizontal in this area do not conform to large tsunamis originating in the area north of Honduras. This could be the beginning of a new round of large to major earthquakes around the world in the remaining days of January. Quiet seismic conditions for the past two month have led to a deficit in large events, one which may be made up for in coming days. In recent years mid-January has seen a number of major damaging earthquakes. These included the M 7.2 in Haiti of January 12, 2010 and an M 6.5 in Puerto Rico on January 13, 2014. This summary had anticipated a possible large earthquake in this area in previous summaries as:

 

"TC Irving (04S) formed today south of Sumatra, Indonesia with winds  up to 45 kts. It is expected to track to the south over the next five days. This is not a seismic zone but the antipode in El Salvador and Guatemala at 12N 89W is and could see some promoted seismicity in this active zone which has seen several moderate earthquakes in the past several days." (January 6-7, 2018)

 

Further promoters of this seismicity may have been the strong nor'easter which occurred four days ago and the first major storm of the season in California and moved the North American tectonic plate to the north reducing normal stress along faults marking the boundary between the North American and the Caribbean plates. Recent activation of the western boundary of North America (in central California), show another possible area for this stress to be relieved. 

 

While this epicenter is far from populated areas, it was widely felt within about 2000 km of the epicenter. Maximum shaking of VI was reported by NEIC in Quebrada de Arena, Colon, Honduras and V in Savannah Bight, Islas de la Bahia, Honduras. Shaking was reported from Honduras, Nicaragua, Belize, Mexico, El Salvador, Costa Rica, Florida, Guatemala, Panama, Florida, Alabama, Puerto Rico, Virgin Islands, Kentucky, Missouri. Moderate aftershocks were also felt in Honduras and Belize. Moderate swarms in Central America preceded the Honduras event in Oaxaca and Chiapas, Mexico and in Costa Rica. Light to moderate earthquakes in the active regions of Kansas and Oklahoma have all but disappeared in the last week. It will be interesting to see if this regional seismicity returns in the next week following the changes in regional stresses following the event in Honduras. A strong earthquake hit the same area north of Honduras on May 28, 2009 (M 7.3)  but this is the strongest earthquake in the region within about 300 km of this epicenter in the past 25 years at least. Forecast 113573 expected this area of the Caribbean Sea would probably see a moderate to large earthquake around January 12.

 

O: 10JAN2018 04:51:35  17.4N   83.2W mb=4.6  EMSC   NORTH OF HONDURAS

O: 10JAN2018 02:51:31  17.5N   83.5W mw=7.6  ANSS   Great Swan Island Honduras

O: 10JAN2018 02:51:32  17.4N   83.6W Mw=7.6  EMSC   NORTH OF HONDURAS

O: 10JAN2018 04:57:23  17.5N   83.2W mb=4.5  EMSC   NORTH OF HONDURAS

O: 10JAN2018 04:12:02  17.5N   83.6W mb=4.5  EMSC   NORTH OF HONDURAS

O: 10JAN2018 07:10:53  17.5N   83.8W mb=4.3  EMSC   NORTH OF HONDURAS

O: 10JAN2018 03:40:19  16.8N   85.1W mb=4.3  EMSC   OFFSHORE HONDURAS            

O: 10JAN2018 05:13:51  17.3N   84.1W mb=4.3  EMSC   NORTH OF HONDURAS            

P: 12JAN2018 113573    19.0N   81.0W 3.5-5.2 AAAAA  Caribbean Sea              

 

The second largest earthquake in the world today was an M 5.4 in the area of

Tokyo, Japan. A foreshock of M 4.9 preceded the mainquake. This area has seen a series of moderate earthquakes following the super full moon of January 2. This activity had been expected in previous issues of this summary.

 

"The full moon will arrive on January 2, 2018 at 02:24 UT. This is a supermoon with the moon at its closest  point in its orbit. Tidal effects are likely to be about 30% larger than with a normal full moon. Longitudes experiencing maximum tidal stresses at this time center about 20 degrees around 37W and 143E and include the mid-Atlantic and the east Pacific rim including New Guinea north to Honshu, Japan. These are most likely to see a strong tidally triggered earthquake in the next six days but tidal triggering is possible in many areas and is not limited to these longitudes." (December 31, 2017 to January 1, 2018)

 

More activity near 143 East longitude is certainly likely in the next several days. The last earthquake within about 200 km of this epicenter in the Izu Islands with M>=5.4 occurred on August 22, 2016 with M 5.6. More recent events on September 20, 2016 (M 6.1) and December 21, 2017 (M 5.7) have occurred slightly more than 200 km from today's epicenter. Forecast 113401 had expected this event within about 50 km of these epicenters in early January." (January 2-5, 2018)

 

NEIC reported this earthquake was felt with intensity II-III in the region of Japan at Chiba, Tokyo, Kanagawa, Prefectures, Japan.

 

Forecast 113637 had expected this event was likely within about 100 km of this epicenter around January 13.

 

O:  9JAN2018 22:30:17  35.4N  141.1E mb=5.4  EMSC   NEAR EAST COAST OF HONSHU, JAP

O:  9JAN2018 22:20:50  35.4N  141.3E mb=4.9  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 13JAN2018 113637    35.0N  140.0E 4.0-5.7 AAAAA  Off East Coast Honshu      

 

MODERATELY STRONG QUAKE SHAKES GALAPAGOS ISLANDS

 

EARTHQUAKE SUMMARY FOR JANUARY 8, 2018

 

An earthquake of M 5.7 shook the region of the Galapagos Islands, Ecuador today. The mainshock was preceded by a M 4.8 about seven hours earlier. The foreshock

 occurred within about 30 minutes of local solar noon and could have been promoted by strong tidal stresses which maximize at this hour. Two earthquakes of M>=5.7 have occurred in the Galapagos within about 300 km of this epicenter in the past 25 years - both of M 5.9 on February 4, 2006 and October 21, 2000.  Forecast 113306 had expected this event within about 25 km of this epicenter was likely around January 7. The antipode of this epicenter is in the Sumatra area of Indonesia. Tropical Cyclone Irving passed near this area over the past several days and energy associated with this storm may have helped promoted this earthquake in the Galapagos.

 

O:  8JAN2018 17:38:33   1.8N   90.9W mb=4.8  EMSC   GALAPAGOS ISLANDS REGION     

O:  9JAN2018 00:06:03   2.0N   90.5W Mw=5.7  EMSC   GALAPAGOS ISLANDS REGION     

P:  7JAN2018 113306     2.0N   91.0W 3.5-5.4 AAAAA  Galapagos Islands          

 

An earthquake of M 4.4 in Sumatra occurred near the antipode of the Galapagos Islands. Antipodal activity in these two areas is not unknown but in this case is probably not closely related. Forecast 113549 had expected this earthquake was likely within about 50 km of this epicenter around January 14.

 

O:  8JAN2018 15:51:04   2.6N   95.8E mb=4.4  EMSC   SIMEULUE, INDONESIA           

P: 14JAN2018 113549     3.0N   95.0E 4.0-5.7 CAAAA  Nicobar Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 in the Rat Islands, Aleutians. It was not reported felt in this remote area. The last earthquake in this area of the Rat Islands with M>=4.1 was an  M 4.1 on December 26, 2017 and prior to that an M 4.3 on November 28, 2017. Forecast 113475 had expected this event was likely around January 6.

 

O:  8JAN2018 16:19:03  50.6N  178.7E mb=4.1  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  6JAN2018 113475    52.0N  178.0E 4.0-5.7 ABAAA  Rat Islands                

 

ACTIVE SEISMICITY CONTINUES ALONG CALIFORNIA COAST

 

EARTHQUAKE SUMMARY FOR JANUARY 7, 2018

 

Active seismic conditions continued along the California coastline today with an M 4.7 off the coast of Northern California. NEIC reported this event was felt lightly with intensity II-III along the coast at Ferndale, Petrolia, Loleta, Fortuna, Hydesville, Eureka, Scotia, Arcata, Carlotta, Whitethorn, Myers Flat, McKinleyville, and Garberville. No damage or casualties were reported with this earthquake. This is the strongest of the recent moderate earthquakes felt in California which have included events far off the northern Coast, in Santa Barbara Channel and in San Francisco. On January 2, this summary placed the region on a moderate seismic watch as:

 

"... The event in the North Pacific Ocean is the first with M>=4.7 within about 300 km of this epicenter since an M 5.2 on June 16, 1997, the only such earthquake in the area in the past 25 years.  Earthquakes far off the coast of California have occasionally been followed shortly by moderate to large earthquakes in California. A seismic watch is therefore being called for Central and Northern California for the next week through January 10. A watch indicates some precursory activity may be occurring and the active current conditions in the region are likely to continue with the potential for a moderate to strong regional event." (January 2, 2018)

 

Seismic promotion in this area probably came from the nor'easter that hit the northeastern U.S. two days ago as well as tidal stresses. Today's earthquake is the strongest within about 100 km of this epicenter since an M 5.1 on July 29, 2017, the only such event in the past year. Forecast 113680 had expected this event in this area in early January.

 

O:  7JAN2018 19:00:57  40.4N  125.3W mb=4.7  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 12JAN2018 113680    40.9N  126.3W 2.5-4.4 BAAAA  Off Coast of No. Calif     

 

Unusual activity also continued in the U.S. today. An M 2.7 in the State of Georgia was reported felt with light intensity II-III in Georgia at Fort Oglethorpe, Ringgold, Rossville, Dalton, Gainesville, and Cataula; in Tennessee at Chattanooga, Ooltewah, in Pickens, South Carolina and possibly in Century, Florida. The last earthquake of M>=2.7 within about 100 km of today's epicenter occurred on October 20, 2017 with M 2.7. The last event of significantly larger magnitude in the area was an M 3.0 on December 10, 2013.   Forecast 113389 had expected today's event was likely around January 4.

 

O:  7JAN2018 09:53:19  35.0N   85.2W MD=2.7  EMSC   GEORGIA, USA                 

P:  4JAN2018 113389    35.0N   84.0W 2.0-4.4 BAAAA  Kentucky/Tennessee/NC      

 

Another earthquake south of San Antonio, Texas also occurred today with M 3.2. NEIC reported it was felt with intensity I-II in Texas at Poth and Gillett. This quake follows a similar event (M 3.5) yesterday in the area. The last activity in this region of Texas was an M 3.2 on September 10, 2014.  Forecast 113405 had expected activity in western Texas in early January.

 

O:  7JAN2018 08:56:55  28.9N   98.2W mb=3.2  EMSC   SOUTHERN TEXAS               

P:  1JAN2018 113405    31.5N  103.6W 2.0-4.0 CCCAA  SW U.S.A                   

 

An earthquake of M 5.1 in El Salvador was the largest recorded today. It was reported felt with intensity IV in Chinandega, Nicaragua and in El Salvador at Santo Tomas, and San Salvador and II-III in Nueva San Salvador, Antiguo, Delgado, Soyapango, Ilopango and El Rosario. This earthquake may have been promoted by energy from Tropical Cyclone Irving at the antipode south of Sumatra. This summary had suggested this in previous summaries as:

 

"TC Irving (04S) formed today south of Sumatra, Indonesia with winds  up to 45 kts. It is expected to track to the south over the next five days. This is not a seismic zone but the antipode in El Salvador and Guatemala at 12N 89W is and could see some promoted seismicity in this active zone which has seen several moderate earthquakes in the past several days." (January 6-7, 2018)

 

The last event of similar or larger magnitude within about 150 km of today's epicenter was an M 5.1 on January 3 about 150 km to the northwest. Forecast 113348 had expected this event off the coast of El Salvador was likely around January 9.

 

O:  7JAN2018 08:55:29  12.8N   88.2W Mw=5.1  EMSC   OFFSHORE EL SALVADOR         

P:  9JAN2018 113348    13.0N   87.0W 3.5-5.5 AAAAA  Nicaragua                  

 

MODERATELY LARGE QUAKE SHAKES INDIA AND MYANMAR

 

EARTHQUAKE SUMMARY FOR JANUARY 6, 2018

 

An earthquake of M 5.5-6.0 shook regions of Myanmar and northern India today. NEIC reported it was felt in India with intensity IV in Manipur at Manipur and Kakching. There were no initial reports of damage but some may have occurred. A tropical cyclone  passed east of the Philippines several days ago and may have helped promote today's event. The last earthquake within about 200 km of this epicenter with M>=5.5 occurred a year ago on January 3, 2017 with M 5.7 and prior to that on January 3, 2016 with M 6.7. A larger earthquake occurred about 300 km southeast of this on April 13, 2016. Forecast 113366 had expected today's event within  about 25 km of the epicenter was likely around January 8.

 

O:  7JAN2018 06:47:16  24.7N   94.9E Mw=6.0  EMSC   MYANMAR-INDIA BORDER REGION  

P:  8JAN2018 113366    25.0N   95.0E 4.0-5.6 AAAAA  Myanmar                    

 

A moderately large earthquake of M 5.7 also occurred today in the Komandorsky Islands. It was not reported felt in this remote area of Russia. The last earthquake in the Komandorsky Islands within about 200 km of this epicenter with M>=5.7 occurred on July 17, 2017 with M 7.7. Today's event appears to be the strongest regional aftershock of that July quake to date.   Forecast 113470 had expected this event in this area in early January.

 

O:  7JAN2018 02:24:11  55.2N  165.6E mb=5.7  EMSC   KOMANDORSKIYE OSTROVA REGION 

P:  3JAN2018 113470    56.0N  164.0E 4.0-5.8 BAAAA  Komandorsky Isl            

 

An unusual earthquake of M 2.5 was recorded south-central Wyoming today. NEIC reported this earthquake of M 2.5 in Wyoming was felt with intensity II-III in the area(s) of Wyoming at Guernsey, Hartville, Wheatland and Garrett. Wyoming today. The last earthquake of M>=2.5 in Wyoming within about 100 km of this epicenter was an M 2.8 on December 19, 2013. This area sees much mining at this magnitude level and other events in 2011 and 2013 may be mining-related. Forecast 113426 had expected a regional event about 200 km to the southwest was likely around January 2.

 

O:  6JAN2018 14:19:27  42.2N  104.7W ML=2.5  EMSC   WYOMING                      

P:  2JAN2018 113426    40.6N  106.6W 2.0-4.0 BBBAA  Colorado area              

 

An unusual earthquake also occurred in southern Texas with M 3.5 today.  NEIC reported this earthquake of M 3.5 in Southern Texas was felt with intensity II-III in the area(s) of Falls City, Campbellton, Floresville, San Antonio, Cibolo, Mathis, Orange Grove, Corpus Christi, Austin, Houston and Winters, Texas. This is the largest earthquake recorded in this area of southern Texas in at least 25 years. The last earthquake of M>=2.5 within about 100 km of this epicenter occurred on November 14, 2017 with M 2.8. Forecast 113405 had expected an event in western Texas in early January.

 

O:  6JAN2018 15:37:17  28.9N   98.2W mb=3.5  EMSC   SOUTHERN TEXAS               

P:  1JAN2018 113405    31.5N  103.6W 2.0-4.0 BCCAA  SW U.S.A                   

 

The strongest earthquake in the U.S. or Canada today occurred as an M 3.8 in the Santa Barbara Channel off southern California. This may be related to recent moderate quakes in a regional activation. It is possible the nor'easter in the northeastern U.S. of the past several days also helped promote this event.

NEIC reported this earthquake of M 3.8 in Southern California was felt with intensity II-III in the area(s) of Goleta, Santa Barbara, Solvang, Santa Ynez, Buellton, Los Olivos, Lompoc, Carpinteria, Santa Maria, Ventura, Port Hueneme, Arroyo Grande, Glendale, Torrance and Los Angeles, California.  The last earthquake within about 100 km of this epicenter with M>=3.8 occurred on October 26, 2017 (M 4.3) and May 17, 2017 (M 4.1). Earthquakes of M>=3.8 have occurred about once or twice a year in this region since 2009. Forecast 113410 had expected this event about 100 km northeast of this epicenter in early January.

 

O:  7JAN2018 01:39:28  34.4N  120.0W ML=2.1  EMSC   SANTA BARBARA CHANNEL, CALIF.

O:  7JAN2018 01:31:10  34.4N  120.0W Mw=3.8  EMSC   SANTA BARBARA CHANNEL, CALIF.

P:  2JAN2018 113410    34.9N  119.0W 2.5-4.8 BAAAA  So. California             

 

MODERATE EARTHQUAKES CONTINUE NEAR TOKYO, JAPAN

 

EARTHQUAKE SUMMARY FOR JANUARY 5, 2018

 

The series of moderate earthquake near Tokyo, Japan continued unabated today. NEIC reported an earthquake of M 4.7 in Southeastern Honshu, Japan was felt with intensity IV in Nagaizumi, Shizuoka and II-III in the area(s) of Kanagawa, Tokyo Prefectures, Japan. A foreshock of M 4.5 was felt in Kanagawa at Yokosuka, Atsugi and Yokohama, Japan.  The mainshock in this series was an M 4.9 which was felt with intensity V in Chiba at Funabashi, Matsudo, and Yamato and Zama, Kanagawa, and IV in Tokyo, and Aichi and II-III in Miyagi, Nagano, Shizuoka, Tokai, Ibaraki, Gunma, Tochigi, and Saitama Prefectures, Japan. An M 4.3 was also felt lightly earlier in the day at Yokohama, Kanagawa, Japan. Mapping suggests a "Mogi Donut" may be forming off southeastern Honshu around a point near 35N 140E. Mogi Donuts form a circle of epicenters about a possible upcoming major earthquake in the days before such events. The earthquakes in  Japan are occurring at the longitude of maximum tidal stress associated with the full moon of January 2 and may be promoted by stresses from that tidal event. This series began with the full moon of January 2 and has continued since that time. The events lie at the longitude of maximum tidal stress with this full moon and the strongest of today's events, an M 4.9 occurred within about an hour of local solar midnight when tidal stress is high. The instability of the area suggests that a strong regional earthquake may be in the making shortly.  The tidal seismicity forecast had read:

 

"The full moon arrived on January 2, 2018 at 02:24 UT. This is a supermoon with the moon at its closest  point in its orbit. Tidal effects are likely to be about 30% larger than with a normal full moon. Longitudes experiencing maximum tidal stresses at this time center about 20 degrees around 37W and 143E and include the mid-Atlantic and the east Pacific rim including New Guinea north to Honshu, Japan. These are most likely to see a strong tidally triggered earthquake in the next six days but tidal triggering is possible in many areas and is not limited to these longitudes." (January 1-5, 2018)

 

Forecast 113397 had expected today's activity within about 25 km of the epicenters was likely around January 5.

 

O:  5JAN2018 19:37:58  34.8N  139.3E mb=4.5  EMSC   NEAR S. COAST OF HONSHU, JAPAN

O:  5JAN2018 20:47:59  34.9N  139.2E mb=4.7  EMSC   NEAR S. COAST OF HONSHU, JAPAN

O:  5JAN2018 10:55:27  35.4N  141.3E Mw=4.3  EMSC   NEAR EAST COAST OF HONSHU, JAP

O:  5JAN2018 15:54:13  35.5N  140.0E mb=4.9  EMSC   NEAR S. COAST OF HONSHU, JAPAN

P:  5JAN2018 113397    35.0N  139.0E 3.5-4.9 AAAAA  No. Honshu, Japan          

 

The strongest earthquake in the world also occurred near the longitude of maximum tidal stress associated with the full moon (see above). This earthquake of M 5.2 in eastern New Guinea was not reported felt. The last earthquake in New Guinea within about 100 km of this epicenter with M>=5.2 occurred on December 1, 2017 with M 6.0. Today's event is probably an aftershock of the December earthquake. Forecast 113322 had expected it was likely within about 50 km of this epicenter around January 8.

 

O:  5JAN2018 16:36:22   5.5S  147.0E mb=5.2  EMSC   EASTERN NEW GUINEA REG., P.N.G

P:  8JAN2018 113322     6.0S  147.0E 4.0-5.4 BAAAA  New Ireland                

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the Andreanof Island, Alaska. This is a remote, active area and this event was not reported felt. The last  earthquake in the Andreanof Islands within about 100 km of this epicenter with M>=4.2 occurred on November 15, 2017 with M 4.4 but has been quiet for nearly two months at this magnitude level. Forecast 113465 had expected today's event within about 10 km was likely around January 4.

 

O:  6JAN2018 05:03:59  51.9N  179.7W mb=4.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  4JAN2018 113465    51.9N  179.8W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

MODERATE QUAKE SHAKES SAN FRANCISCO, CA, LARGEST IN 11 YEARS

 

EARTHQUAKE SUMMARY FOR JANUARY 4, 2018

 

An earthquake of M 4.4 hit the region of San Francisco early on January 4. This event occurred near local solar midnight and was probably promoted by high tidal stresses which maximize at this hour. NEIC reported it was felt with maximum intensity VI including IV at Emeryville, Oakland, Berkeley, Orinda, El Cerrito, Alameda, San Francisco, Richmond, Moraga, El Sobrante, Lafayette, and other communities within about 100 km of the epicenter. An aftershock of M 2.6 was reported felt with intensity II-III in Cupertino, Los Altos, Sunnyvale, San Jose, Mountain View, Saratoga, and other communities within about 50 km of the epicenter. An M 2.5 foreshock occurred within about an hour of local solar midnight and was reported felt with intensity II-III in Milpitas, Fremont, Pleasanton, San Jose, Sunnyvale and Hayward and within about 50 km of the epicenter. No major damages or casualties were associated with this moderate earthquake. At M 4.4 this is the strongest earthquake within about 100 km of this epicenter in San Francisco since an M 5.6 more than 11 years ago on October 31, 2007 and  prior to that an M 4.4 on February 25, 2001. Only one other earthquake of M>5 has occurred in this area in the past 25 years - an M 5.3 on January 16, 1993. This summary had placed the area under seismic watch three days ago and a number of indicators suggested this earthquake could happen at this time. In the previous issue of this summary some of these were noted as:

 

 

"A strong nor'easter is hitting the region of the eastern coastline of the U.S. today. This storm is a winter hurricane with maximum winds at hurricane levels and is being described as a "cyclone bomb" in which the pressure drops 50 mb in a 24 hour period. Strong storms in this region often are associated with unusual seismicity along the northeastern region of North America as noted in previous issues of this summary. This included the second strongest earthquake in Canada - an M 7.7 in the Queen Charlotte Islands area which coincided with a strong nor'easter - Sandy on October 28, 2012. This summary noted this at the time as:

 

"... trigger for this earthquake is probably Hurricane Sandy which is moving along the east coast of North America. The current motion  pushes North America north with respect to the Pacific plate. This could have a major effect on the movement seen in the Pacific Northwest in this earthquake." (October 27-28, 2012)

 

In the current case this may include a moderate earthquake in the currently active region of central to northern California as previously noted in this report:

 

"... The event in the North Pacific Ocean is the first with M>=4.7 within about 300 km of this epicenter since an M 5.2 on June 16, 1997, the only such earthquake in the area in the past 25 years.  Earthquakes far off the coast of California have occasionally been followed shortly by moderate to large earthquakes in California. A seismic watch is therefore being called for Central and Northern California for the next week through January 10. A watch indicates some precursory activity may be occurring and the active current conditions in the region are likely to continue with the potential for a moderate to strong regional event." (January 2, 2018)” (January 3-4, 2018)

 

Forecast 113381 had expected today's event within about 40 km of the epicenter was likely with magnitude up to M 4.5 around January 6. These events are at 106 degrees from the M 7.2 in Iran of November 12, and at 72 degrees (node 5) from Samoa of November 4, 2017, the last major earthquakes in  the world and may have been promoted from that source (A major quake in the world is overdue).

 

O:  5JAN2018 06:16:11  37.5N  121.4W MD=2.1  EMSC   NORTHERN CALIFORNIA           

O:  4JAN2018 09:22:30  37.5N  121.4W MD=2.5  EMSC   NORTHERN CALIFORNIA          

P:  9JAN2018 113381    37.7N  121.9W 2.5-4.6 BAAAA  Central California         

 

O:  4JAN2018 11:34:44  37.3N  122.1W MD=2.5  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O:  4JAN2018 10:39:36  37.9N  122.2W Mw=4.4  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P:  6JAN2018 113381    37.8N  122.6W 2.5-4.5 AAAAA  Central California         

 

An earthquake of M 4.9 was also felt in the area of Peje, Kosovo today. NEIC reported it was felt with intensity III in Podgorica, Montenegro. EMSC reported moderate to strong shaking in Montenegro at Velika, Plav, Kelmend, Berane, Rozaje, Peje, Podgorica, and others. It was also lightly felt in Macedonia, Albania, Serbia, Croatia and within about 200 km of the epicenter.  It was reported as far as Romania, Greece and Italy as a strong quake. Rockslides were reported with the quake. The earthquake was apparently triggered by strong tidal stresses as it occurred with a few minutes of local solar noon, a prime time for tidal stresses associated with the full moon. The area of Greece, Macedonia and Montenegro has been active over the past week, probably triggered by new moon stresses with several regional earthquakes of M>=5. The last earthquake within about 150 km of this event in Montenegro with M>=5 was an M 5.0 on December 29, 2014 and prior to that an M 5.5 on September 6, 2009. Forecasts 113199 and 113452 had expected this activity in late December or early January in this area.

 

O:  4JAN2018 10:46:11  42.7N   19.9E mb=5.0  EMSC   MONTENEGRO                   

P: 25DEC2017 113199    42.0N   20.0E 3.0-5.4 CAAAA  Romania/NW Turkey          

P:  4JAN2018 113452    41.0N   20.0E 3.0-5.3 ABAAA  Romania/NW Turkey          

 

An active period in the area near Tokyo, Japan continued today with events of M 4.4 and 4.7 widely felt.  NEIC reported this earthquake of M 4.7 in Southeastern Honshu, Japan was felt with intensity II-III in the area(s) of Ibarake, Chiba, Saitama, Shizuoka and Tokyo, Japan. An earthquake of M 4.4 also occurred at this epicenter earlier in the day. This event was reported by NEIC to have been felt with light intensity in Chiba, Tokyo, Saitama and Kanagawa Prefectures, Japan.

Japan occasionally sees strong earthquakes in the winter although these events appear tidally promoted occurring near local solar noon. This series near Tokyo has lasted longer than normal and contained more moderate events than is typical. A strong earthquake in the region of Tokyo, Japan is overdue and would be highly destructive in this area. Forecasts 113402 and 113397 expected today's activity in early January.

 

O:  4JAN2018 06:20:06  35.6N  140.2E mb=4.4  EMSC   NEAR EAST COAST OF HONSHU, JAP

O:  5JAN2018 02:02:24  35.8N  140.8E mb=4.7  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  2JAN2018 113402    36.0N  140.0E 4.0-5.8 AAAAA  Off East Coast Honshu      

P:  5JAN2018 113397    35.0N  139.0E 3.5-4.9 AAAAA  No. Honshu, Japan          

 

NOR'EASTER MAY PROMOTE CALIFORNIA SEISMICITY

 

EARTHQUAKE SUMMARY FOR JANUARY 3, 2018

 

A strong nor'easter is hitting the region of the eastern coastline of the U.S. today. This storm is a winter hurricane with maximum winds at hurricane levels and is being described as a "cyclone bomb" in which the pressure drops 50 mb in a 24 hour period. Strong storms in this region often are associated with unusual seismicity along the northeastern region of North America as noted in previous issues of this summary. This included the second strongest earthquake in Canada - an M 7.7 in the Queen Charlotte Islands area which coincided with a strong nor'easter - Sandy on October 28, 2012. This summary noted this at the time as:

 

"... trigger for this earthquake is probably Hurricane Sandy which is moving along the east coast of North America. The current motion  pushes North America north with respect to the Pacific plate. This could have a major effect on the movement seen in the Pacific Northwest in this earthquake." (October 27-28, 2012)

 

In the current case this may include a moderate earthquake in the currently active region of central to northern California as previously noted in this report:

 

"... The event in the North Pacific Ocean is the first with M>=4.7 within about 300 km of this epicenter since an M 5.2 on June 16, 1997, the only such earthquake in the area in the past 25 years. Earthquakes far off the coast of California have occasionally been followed shortly by moderate to large earthquakes in California. A seismic watch is therefore being called for Central and Northern California for the next week through January 10. A watch indicates some precursory activity may be occurring and the active current conditions in the region are likely to continue with the potential for a moderate to strong regional event." (January 2, 2018)

 

The area of California was at slightly elevated seismic conditions today but no events of M>=3 were located. The strongest was an M 2.9 in Central California which was lightly felt in that region. Forecasts 113379 and 113403 had expected this activity in early January.

 

NEIC reported this earthquake of M 2.9 in central California was felt with intensity II-III in the area(s) of Bradley, California.

 

O:  3JAN2018 16:18:14  35.7N  121.1W Md=2.9  EMSC   CENTRAL CALIFORNIA           

P:  7JAN2018 113379    36.2N  120.8W 2.5-4.6 AAAAA  Central California         

P:  9JAN2018 113403    35.8N  121.3W 2.5-4.7 CAAAA  Off So. California         

 

The cyclone season in the south Indian Ocean has begun with Cyclone Ana forming today. This cyclone probably is too far west to affect the antipodal area  of Mexico and California, but subsequent storms in the Indian Ocean do have the potential to trigger seismicity in southern California and the Gulf of Mexico if they form further to the south and east of Cyclone Ana.

 

The strongest earthquake in the world today was an M 5.4 followed shortly thereafter by an M 5.1 aftershock in the Izu Islands off southeastern Honshu, Japan.  Lighter events of M 4.3 and 4.4 also occurred in Japan in Hokkaido and near  Tokyo. As these events  are located at the longitude of maximum tidal stress, this activity is probably related to high tidal stresses associated with the full moon of January 2 as previous described in this summary:

 

"The full moon will arrive on January 2, 2018 at 02:24 UT. This is a supermoon with the moon at its closest  point in its orbit. Tidal effects are likely to be about 30% larger than with a normal full moon. Longitudes experiencing maximum tidal stresses at this time center about 20 degrees around 37W and 143E and include the mid-Atlantic and the east Pacific rim including New Guinea north to Honshu, Japan. These are most likely to see a strong tidally triggered earthquake in the next six days but tidal triggering is possible in many areas and is not limited to these longitudes." (December 31, 2017 to January 1, 2018)

 

More activity near 143 East longitude is certainly likely in the next several days. The last earthquake within about 200 km of this epicenter in the Izu Islands with M>=5.4 occurred on August 22, 2016 with M 5.6. More recent events on September 20, 2016 (M 6.1) and December 21, 2017 (M 5.7) have occurred slightly more than 200 km from today's epicenter. Forecast 113401 had expected this event within about 50 km of these epicenters in early January.

 

O:  3JAN2018 21:32:52  29.6N  140.5E mb=5.1  EMSC   IZU ISLANDS, JAPAN REGION    

O:  3JAN2018 21:30:22  29.7N  140.6E Mw=5.4  EMSC   IZU ISLANDS, JAPAN REGION    

P:  1JAN2018 113401    30.0N  141.0E 4.0-5.8 AAAAA  Off East Coast Honshu      

 

O:  4JAN2018 01:36:21  41.9N  143.1E mb=4.3  EMSC   HOKKAIDO, JAPAN REGION       

P:  8JAN2018 113429    43.0N  142.0E 3.5-5.6 BBAAA  Hokkaido, Japan            

 

MODERATE QUAKE SHAKES ALGERIA

 

EARTHQUAKE SUMMARY FOR JANUARY 2, 2018

 

An earthquake of M 5.0 in Algeria today was felt with maximum intensity VI in Ouled Yaich, Blidah according to data from NEIC. Intensity It was felt within about 40 km of the epicenter in the areas of Blidah, al-Midyah, Tibazah, with lesser shaking in Algiers, Tizi Wazu, Melilla, and within about 200 km of the epicenter. No major damages or casualties were reported with this earthquake. This is the strongest earthquake within about 200 km of this epicenter in Northern Algeria since an M 5.2 on May 28, 2016 and an M 5.1 on December 25, 2014. An M 6.9 hit the region on May 21, 2003 causing much damage and casualties. This may be an aftershock of that event. Forecast 113420 had expected this earthquake in this area was likely around

January 4.

 

O:  2JAN2018 20:59:38  36.3N    2.6E mb=5.0  EMSC   NORTHERN ALGERIA             

O:  3JAN2018 00:23:15  36.3N    2.7E mb=3.6  EMSC   NORTHERN ALGERIA             

O:  3JAN2018 06:08:32  36.4N    2.6E mb=3.4  EMSC   NORTHERN ALGERIA             

O:  2JAN2018 23:06:13  36.4N    2.7E mb=3.5  EMSC   NORTHERN ALGERIA             

P:  4JAN2018 113420    37.0N    5.0E 3.0-4.4 AABAA  Western Mediterranean      

 

A moderate earthquake of M 4.4 also shook the region of Tokyo, Japan today. NEIC reported it was felt with intensity III-IV in Chiba, Tokyo, Kanagawa, Saitama, Ibaraki, and in general within about 100 km of the epicenter. This lies near the longitude of maximum tidal stress at this time and had been anticipated in previous summaries as:

 

 

"The full moon will arrive on January 2, 2018 at 02:24 UT. This is a supermoon with the moon at its closest  point in its orbit. Tidal effects are likely to be about 30% larger than with a normal full moon. Longitudes experiencing maximum tidal stresses at this time center about 20 degrees around 37W and 143E and include the mid-Atlantic and the east Pacific rim including New Guinea north to Honshu, Japan. These are most likely to see a strong tidally triggered earthquake in the next six days but tidal triggering is possible in many areas and is not limited to these longitudes." (December 31, 2017 to January 1, 2018)

 

Forecast 113397 had expected this event was likely around January 5. within about 100 km of the epicenter.

 

O:  2JAN2018 10:48:39  35.6N  140.0E mb=4.5  EMSC   NEAR S. COAST OF HONSHU, JAPAN

P:  5JAN2018 113397    35.0N  139.0E 3.5-4.9 BAAAA  No. Honshu, Japan          

 

The largest earthquake in the U.S. or Canada today was an M 3.9 near Morton, Washington. This earthquake occurred within  minutes of local solar midnight and was probably promoted by tidal stresses associated with the full moon which maximize at this hour. NEIC reported this and aftershocks of M 2.7 and 2.4 were felt in the area with intensity II-III at Morton, Glenoma, Toutle, Amboy, Ariel, Randle, Mineral, Yacolt, Kalama, Kelso, Woodland, Packwood, La Center, Battle Ground, Castle Rock, Washougal and within about 100 km of the epicenter in Washington State. No major damages or casualties were reported with this event. The last earthquake within about 100 km of this epicenter in Washington with M>=3.9 occurred as an M 4.1 on November 16, 2010.  Forecast 113459 had expected this event within about 50 km of the epicenter was likely in early January.

 

O:  3JAN2018 08:39:16  46.3N  122.1W MD=2.7  EMSC   WASHINGTON                   

O:  3JAN2018 08:36:25  46.3N  122.1W ML=3.9  EMSC   WASHINGTON                   

P: 11JAN2018 113459    46.9N  122.0W 2.0-3.9 CAAAA  Washington state, U.S.      

 

The strongest earthquakes in the world today occurred in the Fiji Islands. These included an M 5.3 and M 5.9. They were not reported felt in this remote area. The last earthquake in the Fiji Islands within about 200 km of this epicenter with M>=5.9 occurred September 26, 2017 with M 6.5. The only other such event

in the past year was an M 6.9 on February 24, 2017. Forecast 113280 had expected this active was likely within about 100 km of this epicenter around December 27.

 

O:  2JAN2018 14:57:18  24.9S  178.5E Mw=5.9  EMSC   SOUTH OF FIJI ISLANDS        

P: 27DEC2017 113280    24.0S  179.0E 4.0-5.5 BAAAA  Tonga/Fiji                 

 

An unfelt pair of earthquakes in Mindanao, Philippines today of M 4.7 each may have been triggered by stresses from Tropical Depression Bolaven. This summary had suggested this possibility in previous summaries as:

 

"TD Bolaven (01W) continued today west of the central Philippines with winds up to 40 kts. It is expected to track to the west over the next three days. This is a seismic region and stresses from this storm could help promote moderate to large seismicity in the region in the next four days. Mindanao is especially vulnerable to storm stress promoting local seismicity." (January 1-2, 2018)

 

O:  2JAN2018 12:04:07   6.2N  126.9E mb=4.7  EMSC   MINDANAO, PHILIPPINES        

O:  2JAN2018 12:55:17   6.3N  126.8E mb=4.7  EMSC   MINDANAO, PHILIPPINES        

P:  2JAN2018 113307     7.0N  127.0E 4.0-5.6 AAAAA  Halmahera                  

GREECE SHAKES WITH TIDAL STRESSES

 

EARTHQUAKE SUMMARY FOR JANUARY 1, 2018

 

The strongest seismicity in the world today occurred in northern Greece (M 5.0-5.1) and in the world's ocean ridges, especially in the Northern Mid-Atlantic and Azores regions. The timing of location of these events indicate they were probably promoted by strong tidal stresses associated with the full moon today.

 

A moderate earthquake of M 5.0-5.1 occurred today in northern Greece. NEIC reported it was felt with maximum intensity V in Macedonia at Strunica and IV at Vasilevo, Gevgelija, and Konce and in Petrich, Bulgaria and Thessaloniki, Greece. Intensity II-III was reported within about 100 km of the epicenter in Bulgaria, Greece, and Romania. The mainshock was preceded by a number of light foreshocks and followed by aftershocks. The foreshocks included an M 4.2 felt with maximum intensity IV in Bulgaria, Macedonia, Thessaloniki, Greece and within about 60 km of the epicenter. The foreshocks began with an M 3.9 within minutes of local solar midnight on the day of the full supermoon. This sequence was probably promoted by extra strong tidal stresses associated with this alignment.  The tidal seismicity forecast had read:

 

"The full moon will arrive on January 2, 2018 at 02:24 UT. This is a supermoon with the moon at its closest  point in its orbit. Tidal effects are likely to be about 30% larger than with a normal full moon. Longitudes experiencing maximum tidal stresses at this time center about 20 degrees around 37W and 143E and include the mid-Atlantic and the east Pacific rim including New Guinea north to Honshu, Japan. These are most likely to see a strong tidally triggered earthquake in the next six days but tidal triggering is possible in many areas and is not limited to these longitudes." (December 31, 2017 to January 1, 2018)

 

The epicenter for this earthquake near Macedonia was somewhat unusual. The last earthquake of M>=5.1 within about 200 km of this epicenter was an M 5.2 on March 4, 2012 about 200 km southeast of this epicenter. The last such event within about 150 km occurred on May 24, 2009 with M 5.3 within about 25 km of today's epicenter. Forecast 113453 had expected this earthquake in this region was likely around January 3. These epicenters are at 145 degrees from the strong series in the Loyalty Islands of recent months and may have been promoted by concentrated seismic energy from that source.

 

O: 01JAN2018 22:16:12  41.2N   22.9E ML=3.5  EMSC   GREECE

O: 01JAN2018 23:00:46  41.2N   22.9E ML=3.6  EMSC   GREECE

O: 01JAN2018 22:13:51  41.2N   22.9E ML=3.9  EMSC   GREECE

O: 02JAN2018 04:24:17  41.3N   22.8E mb=5.1  ANSS   W of Rodopolis Greece

O:  2JAN2018 04:24:16  41.2N   22.8E mb=5.0  EMSC   GREECE                       

P:  3JAN2018 113453    41.0N   24.0E 3.0-5.1 AAAAA  Romania/NW Turkey          

 

The earthquake most directly associated with the full moon today occurred in  the Volcano Islands of Japan. This earthquake occurred within half an hour of the full moon completion at the longitude of maximum stress (143 East) (see tidal forecast above) and was probably triggered by stresses from that event. Forecast 113108 had expected this earthquake was likely in late December or early January.

 

O:  2JAN2018 02:53:45  23.1N  143.1E mb=4.6  EMSC   VOLCANO ISLANDS, JAPAN REGION

P: 26DEC2017 113108    24.0N  143.0E 4.0-5.6 CAAAA  Volcano Islands            

 

An unusual near-antipodal pair of earthquakes occurred today beginning with an M 4.7 in the North Pacific Ocean far off Northern California. It was followed nine hours later by an M 5.0 in the Southwest Indian Ridge within about 350 km of the exact antipode of the Pacific event. While these events may have been promoted by the full moon stresses their antipodal nature is noteworthy.  The event in the North Pacific Ocean is the first with M>=4.7 within about 300 km of this epicenter since an M 5.2 on June 16, 1997, the only such earthquake in the area in the past 25 years.  Earthquakes far off the coast of California have occasionally been followed shortly by moderate to large earthquakes in California. A seismic watch is therefore being called for Central and Northern California for the next week through January 10. A watch indicates some precursory activity may be occurring and the active current conditions in the region are likely to continue with the potential for a moderate to strong regional event.

 

O:  2JAN2018 02:16:16  38.8S   46.4E mb=5.0  EMSC   SOUTHWEST INDIAN RIDGE       

 

The epicenters in the North Pacific is at 104 degrees from the M 72. of November 12, 2017 in Iran may have been promoted by concentrated seismic energy from that source

 

O:  1JAN2018 17:03:40  40.6N  137.0W mb=4.7  EMSC   NORTH PACIFIC OCEAN          

 

Earthquakes of M 4.7 and M 4.9 also occurred in the Northern Mid-Atlantic an Azores regions today at 40 and 31 West longitudes. This is consistent with these events being tidally promoted by stresses associated with the Full moon alignment (See forecast above). While seismicity is not uncommon in this section of the North Atlantic Ridge and the Azores, it has not been common at moderate magnitudes of M>=4.7 in recent months.  The event in the Azores is the strongest within about 200 km of that epicenter since an M 4.9 on June 5, 2012 while the M 4.7 in the Mid-Atlantic since an M 4.9 on January 18, 2017. An M 5.9 hit about 300 km northeast of this epicenter on June 30, 2017. Forecast 113399 had expected these two events within about 100 km of their respective epicenter were likely in early January.

 

O:  2JAN2018 01:10:12  32.3N   40.2W mb=4.7  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P:  9JAN2018 113399    33.0N   40.0W 4.0-5.6 CAAAA  No. Mid-Atlantic Ridge     

 

O:  1JAN2018 09:24:58  38.1N   30.7W mb=4.9  EMSC   AZORES ISLANDS, PORTUGAL     

P:  2JAN2018 113399    38.0N   32.0W 4.0-5.4 AAAAA  No. Mid-Atlantic Ridge     

 

2018 COMES IN LIKE A SEISMIC LAMB

 

EARTHQUAKE SUMMARY FOR DECEMBER 31, 2017

 

The New Year (2018) came in today with quiet seismic conditions (Happy New Year to all readers of this summary). The strongest earthquake recorded today was an M 5.2 in the Southern East Pacific Rise. This is near an M 5.7 which occurred about 50 km to the east of this on December 29, 2017. These event have been unfelt in this epicentral area. Forecast 113536 had expected this activity was likely at the end of December or in early January, 2018.

 

O: 31DEC2017 20:59:06  53.1S  118.1W mb=5.2  EMSC   SOUTHERN EAST PACIFIC RISE   

P:  4JAN2018 113536    50.0S  116.0W 4.0-5.4 BCBAA  East Pacific Rise          

 

The strongest earthquake in the U.S. or Canada today was an M 3.8 in Northern California. NEIC reported it was felt with intensity II-III in California at Burnt Ranch, Salyer, Arcata, Ferndale, Dunsmuir. No major damages or casualties were reported this event. The last earthquake within about 50 km of this epicenter with M>=3.8 occurred on August 28, 2016 with M 4.5 and July 21, 2016 (M 4.7). The area had been quiet at this magnitude level for the three years prior to that. Today's event appears to be the strongest aftershock of the August, 2016 event to date. Forecast 113120 had expected today's activity was likely to the south about December 28.

 

O: 31DEC2017 19:49:06  40.5N  123.4W Mw=3.8  EMSC   NORTHERN CALIFORNIA          

P: 28DEC2017 113120    39.6N  123.4W 2.5-4.6 BAAAA  Central California         

 

An earthquake of M 3.1 in southern California in eastern Los Angeles today was followed by an M 2.5 aftershock. NEIC reported this earthquake of M 3.1 in Southern California was felt with intensity II-III in the area(s) of Ontario, Rancho Cucamonga, Mira Loma, Chino, Montclair, Upland, Fontana, Norco, Corona, Upland, Riverside, Chino Hills, Ponoma, Bloomington, and other communities within about 50 km of the epicenter. An aftershocks of M 2.5 was felt with intensity II-III in Silverado, Foothill Ranch, Rancho Santa Margarita, Lake Forest Irvine, Mission Viejo, and within about 20 km of the epicenter.  The last earthquake with M>=3.1 in this area of Los Angeles, California within about 50 km of this epicenter occurred on August 14, 2017 with M 3.2. Seven such quakes occurred in the past year.  Forecast 113410 had expected today's event was likely around January 1.

 

O:  1JAN2018 08:49:57  33.8N  117.5W ML=2.5  EMSC   GREATER LOS ANGELES AREA, CALI

O:  1JAN2018 01:35:34  34.0N  117.6W ML=3.1  EMSC   GREATER LOS ANGELES AREA, CALI

P:  1JAN2018 113410    34.2N  117.8W 2.5-4.4 AAAAA  So. California             

 

EARTHQUAKE IN GREECE WIDELY FELT

 

EARTHQUAKE SUMMARY FOR DECEMBER 30, 2017

 

An earthquake of M 5.0 in Greece was widely felt today. NEIC reported maximum intensity VI in Voiotia and IV in Korinthia with lesser shaking in Attiki, Athens and Karditsa.

 No major damages or casualties were reported with this earthquake. This is the largest quake within about 100 km of this epicenter since an M 5.0 more than a year ago on December 3, 2016. Forecast 113372 had expected this event to the south in the Aegean Sea in early January, 2018.

 

O: 31DEC2017 04:02:19  38.2N   22.9E mb=4.9  EMSC   GREECE                       

O: 31DEC2017 04:02:19  38.2N   22.9E mb=5.0  ANSS   GREECE                       

P:  2JAN2018 113372    35.0N   23.0E 3.0-4.5 ACAAA  Aegean Sea                  

 

The strongest earthquake recorded today was an M 5.2 in the region of Tarapaca, Chile and in southern Peru.  NEIC reported this earthquake of M 5.2 in Northern Chile was felt with intensity IV in Iquique, Tarapaca and II-III in the area(s) of Arica, Chile and in Peru at Tacna, Moquegua and Arequipa, Peru.  An event of M 5.5 hit the same region as recently as December 11, 2017. There have been eight events within about 200 km of this epicenter with M>=5.2 during 2017, the largest of which was an M 6.3 on October 10, 2017.  Forecast 113260 had expected today's event within about 35 km of the epicenter was likely around December 29.

 

O: 30DEC2017 08:20:50  19.3S   69.2W Mw=5.2  EMSC   TARAPACA, CHILE              

P: 29DEC2017 113260    19.0S   69.0W 4.0-5.6 AAAAA  So. Peru/Bolivia           

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 in Central Alaska. NEIC reported this earthquake of M 4.1 in Central Alaska was felt with intensity IV in Healy, Alaska and II-III in the area(s) of Cantwell, Fairbanks, North Pole, Alaska. This is the largest earthquake within about 100 km of this epicenter since an M 4.2 on September 21, 2017.  Forecast 113240 had expected this event in this area was likely around December 28.

 

 

O: 30DEC2017 11:43:16  63.8N  149.0W ML=4.1  EMSC   CENTRAL ALASKA               

P: 28DEC2017 113240    63.0N  148.6W 3.2-5.1 AAAAA  Central Alaska             

 

The largest event in the U.S. outside Alaska today was an M 4.0 in Colorado near Trinidad. This continues the 17-year series of light to moderate earthquakes which began in late August 2001 and has continued off-and-on since that time. Earthquakes of M>=4 in this series, however, have not been frequent. The last within this active zone with M>=4 was an 4.0 more than a year ago on December 23, 2016  and prior to that on February 6, 2015 and September 13, 2011, all with M 4.0. The last of larger magnitude in the area occurred in conjunction with a major GRB and the Washington D.C. quake of August 23, 2011 with M 5.3 - the largest ever recorded in this area.  Forecast 113386 had expected this event within about 50 km in early January.

 

NEIC reported this earthquake of M 4.0 in Colorado was felt with intensity IV in Weston, Aguilar, La Veta, Colorado and II-III in the area(s) of Colorado at Trinidad, Walsenburg, Colorado City, Pueblo, Las Animas, Englewood, and Morrison and in Raton, New Mexico.

 

O: 30DEC2017 23:46:12  37.3N  104.9W Mw=4.0  EMSC   COLORADO                     

P:  6JAN2018 113386    36.9N  105.1W 2.0-4.0 CAAAA  Colorado area              

 

MODERATELY LARGE QUAKES CONTINUE IN SOUTH PACIFIC

 

EARTHQUAKE SUMMARY FOR DECEMBER 29, 2017

 

The strongest earthquakes in the world today continued in the South Pacific Ocean. The strongest of these was an M 5.8 in New Britain followed by an M 5.7 in the Southern East Pacific Rise. The event in the East Pacific Rise was in a remote area and was not reported felt. This is the strongest earthquake within  about 400 km of this epicenter since an M 5.7 on March 11, 2011 and prior to that  an M 5.9 on July 29, 2008. The strongest event in the region in the past 25 years was an M 6.0 on July 22, 1993. 

 

O: 29DEC2017 21:20:53  53.1S  117.3W Mw=5.7  EMSC   SOUTHERN EAST PACIFIC RISE   

P:  4JAN2018 113536    50.0S  116.0W 4.0-5.4 BCAAA  East Pacific Rise           

 

The strongest earthquake of the day was the M 5.8 in New Britain, New Guinea.

It was not widely felt in this remote area. The last earthquake of M>=5.8 within about 200 km of this epicenter occurred on September 25, 2017 with M 5.9. The last within about 100 km was an M 5.8 on August 7, 2017. Four events in this area with M>=5.8 have occurred in the past year. Forecast 113321 had expected a moderate earthquake in this area around January 2, 2018. Like the events in central California this epicenter is at 104 degrees from the M 7.2 in Iran of November 12 and may have been promoted from this source. Forecast 113536 expected this event was likely to occur in this area around January 4.

 

O: 29DEC2017 23:55:57   5.5S  150.8E Mw=5.8  EMSC   NEW BRITAIN REGION, P.N.G.   

P:  2JAN2018 113321     4.0S  151.0E 4.0-5.4 BBAAA  New Ireland                

 

A moderate earthquake of M 4.5 in Antigua and Barbuda today was felt with intensity II-III in Saint Mary, Antigua and Barbuda and in Sint Maarten, Netherlands Antilles, Leeward Islands.  This summary had expected a moderate event in this area could be promoted by Tropical Storm Hilda at the antipode north of Australia as:

 

"A tropical cyclone may be forming north of northwestern Australia. This system (Tropical cyclone Hilda) is currently located at 19S 122E and moving southward at 6 kts with winds up to 45 kts. It is expected to dissipate today. Seismicity in the Timor Island area of Indonesia as well at near the antipode in the Leeward Islands could increase with this storm. The Leeward Islands have had several moderate quakes in the past several days as this storm developed and may have been affected by antipodal effects." (December 28, 2017)

 

The earthquake in Antigua is the strongest within about 100 km of that epicenter since an M 5.2 on December 24, 2017 about 100 km to the northwest of this. Similar  quakes in 2017 hit the area on November 28 and April 17 both with M 4.8. The M 4.8 in April followed a mainshock of M 5.6 near today's epicenter.   Forecast 113342 had expected this event within about 25 km was likely around

January 1, 2018.

 

O: 30DEC2017 03:14:20  17.3N   62.1W ML=4.7  EMSC   ANTIGUA AND BARBUDA REGION   

P:  1JAN2018 113342    17.0N   62.0W 3.0-5.3 AAAAA  Leeward Islands            

 

Light earthquakes continued in central California near Hollister today. Thses were felt lightly in Hollister, San Juan Bautista, San Jose and Stockton among other areas. The largest of the swarm today was an M 3.0 which had been expected in forecast 113117 around December 29.

 

O: 29DEC2017 12:04:38  36.6N  121.2W Md=2.4  EMSC   CENTRAL CALIFORNIA

O: 29DEC2017 16:28:52  36.7N  121.3W MD=2.4  EMSC   CENTRAL CALIFORNIA

O: 29DEC2017 15:21:33  36.7N  121.3W MD=2.9  EMSC   CENTRAL CALIFORNIA

O: 29DEC2017 15:50:40  36.7N  121.3W MD=2.9  EMSC   CENTRAL CALIFORNIA

O: 29DEC2017 19:52:02  36.7N  121.3W Md=2.1  EMSC   CENTRAL CALIFORNIA

O: 30DEC2017 04:15:11  36.7N  121.4W ML=3.0  EMSC   CENTRAL CALIFORNIA           

P: 29DEC2017 113117    36.4N  121.0W 2.5-4.5 AAAAA  Central California         

 

 

 

MODERATE QUAKES ABUNDANT

 

EARTHQUAKE SUMMARY FOR DECEMBER 28, 2017

 

A series of moderate to moderately large earthquakes hit a number of areas today. These included an M 5.7 in the Talaud Islands; an M 5.4 in Guatemala and an M 5.4 in the Nicobar Islands, India.

 

The strongest earthquake of the day occurred in the Talaud Islands region of Indonesia. NEIC reported it was felt with intensity II in Luzon, Southern Mindanao, Philippines. BMG reported this event was felt with intensity IV in Naha, Sulawesi, Indonesia. No damages or casualties were reported with this event. It is the strongest within about 100 km of this epicenter since an M 5.7 on December 4, 2016 and an M 5.7 on April 5, 2016. The last earthquake of larger magnitude in the area was an M 6.5 on January 11, 2016 and an M 6.1 on April 19, 2009, Forecast 113040 had expected it within this area was likely around December 27.

 

O: 28DEC2017 17:20:20   4.1N  126.9E Mw=5.7  EMSC   KEPULAUAN TALAUD, INDONESIA  

O: 28DEC2017 17:20:21  04.0N  126.9E MS=5.7  BMG  Felt with intensity IV

P: 27DEC2017 113040     5.0N  126.0E 4.0-5.6 AAAAA  Mindanao, Philippines      

 

An earthquake in Guatemala of M 5.1-5.4 today was felt with intensity II in Guatemala City. It was preceded by a series of moderate foreshocks over the past two days. The last earthquake in Guatemala with M>=5.4 was an M 6.8 on June 22 and an M 6.9 on  June 14, 2017, the only such events in the past year. This is probably the strongest aftershock to date of these events. Forecast 113076 had expected this earthquake was likely within about 100 km of the epicenter in Guatemala around December 30.

 

O: 29DEC2017 09:42:46  13.9N   91.7W Mw=5.4  EMSC   OFFSHORE GUATEMALA           

P: 30DEC2017 113076    13.0N   91.0W 3.5-5.3 AAAAA  Guatemala                   

 

O: 28DEC2017 09:43:36  13.7N   92.4W ML=4.1  EMSC   OFFSHORE GUATEMALA           

O: 28DEC2017 09:43:36  13.7N   92.4W ML=4.1  UNAM  al SUR de CD HIDALGO, CHIS *: 13.7

O: 28DEC2017 09:16:20  13.7N   92.4W ML=4.2  UNAM  al SUROESTE de CD HIDALGO, CHIS *:

O: 28DEC2017 09:16:20  13.8N   92.4W ML=4.2  EMSC   OFFSHORE GUATEMALA           

P: 29DEC2017 113071    14.0N   93.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

An earthquake of M 3.8 was felt off the coast of northern California today. It was reported by NEIC to have been felt with intensity II-III in Petrolia, Ferndale, Rio Dell, Fortuna, Hydesville, Eureka, Arcata and McKinleyville, California. There were no reported damages or casualties with this quake. The last event  off the coast of Northern California with M>=3.8 occurred on December 15, 2017 (M 3.9) and prior to that on September 22, 2017 (M 3.9). Only one earthquake with M>4 has hit the area during 2017 - an M 5.1 on July 29.  Forecast 113445 had expected this event within about 25 km of the epicenter was likely in early January, 2018.

 

O: 29DEC2017 04:45:42  40.3N  124.5W ML=3.8  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P:  4JAN2018 113445    40.2N  124.2W 2.5-5.0 BAAAA  Off Coast of No. Calif     

 

The swarm of minor earthquakes near Hollister, California also continued today. Several of these events exceeded M 3.0 and were felt with intensity II-III in Gonzales, Marina, Carmel Valley, Greenfield, Monterey, Salinas, Hollister, San Juan Bautista, Soledad, Carmel Valley and Coyote, California. Forecast 113117 expected this activity within about 10 km of these epicenters was likely in late December, 2017.

 

O: 29DEC2017 05:48:33  36.5N  121.0W MD=2.2  EMSC   CENTRAL CALIFORNIA           

O: 29DEC2017 12:04:38  36.6N  121.2W Md=2.4  EMSC   CENTRAL CALIFORNIA

O: 28DEC2017 11:35:46  36.7N  121.3W MD=2.1  EMSC   CENTRAL CALIFORNIA           

O: 28DEC2017 11:28:17  36.7N  121.3W MD=2.2  EMSC   CENTRAL CALIFORNIA           

O: 28DEC2017 08:57:16  36.7N  121.3W MD=2.6  EMSC   CENTRAL CALIFORNIA            

O: 28DEC2017 08:54:13  36.7N  121.3W ML=3.1  EMSC   CENTRAL CALIFORNIA           

O: 28DEC2017 11:39:50  36.7N  121.3W ML=3.2  EMSC   CENTRAL CALIFORNIA           

P: 24DEC2017 113117    36.7N  121.4W 2.5-4.6 AAAAA  Central California          

 

 

An earthquake of M 3.8 also occurred in the area near Crescent, Oklahoma today. NEIC reported it was felt with maximum intensity up to VI and reported with intensity IV in Hennessey, Dover, Stillwater and Sand Springs, Oklahoma and II-III within about 150 km of the epicenter including at Tulsa, El Reno, Edmond, Guthrie, Enid, and Crescent, Oklahoma among other communities. A second earthquake of M 3.8 in Oklahoma near McLoud was felt with maximum intensity IV in McLoud, Shawnee, Newalla, Oklahoma City, and II-III in Harrah, Choctaw, Tecumseh, Norman, Seminole, Edmond, Oklahoma. Earthquakes of M>=3.8 last occurred in Oklahoma on  December 5 (M 4.2) and October 31, 2017 (M 4.1). Forecasts 113416 and 113159 had expected these earthquakes in Oklahoma were likely at the end of December or in early January, 2018.

 

O: 28DEC2017 20:11:14  35.4N   97.0W mb=3.8  EMSC   OKLAHOMA                     

P:  2JAN2018 113416    36.0N   96.0W 2.0-4.0 BAAAA  Southern Plains            

 

O: 29DEC2017 06:03:27  36.1N   97.7W mb=2.6  EMSC   OKLAHOMA                     

O: 29DEC2017 04:44:59  36.2N   97.7W Mw=3.8  EMSC   OKLAHOMA                     

O: 29DEC2017 06:05:50  36.2N   97.7W mb=2.3  EMSC   OKLAHOMA                     

O: 29DEC2017 05:21:55  36.2N   97.7W mb=2.5  EMSC   OKLAHOMA                     

P: 29DEC2017 113157    37.0N   98.0W 2.0-4.0 AAAAA  Southern Plains            

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in the Andreanof Islands, Alaska. It was not reported felt in this remote epicentral area. The last earthquake in the Andreanof Islands within about 200 km of this epicenter with M>=4.7 occurred on December 9, 2017 with M 4.9. A series of strong quakes hit this area on March 12-19, 2016 and today's event may be an aftershock of those. Forecast 113214 had expected this event was likely within about 50 km of this epicenter around December 29.

 

O: 28DEC2017 14:58:42  52.6N  174.4W mb=4.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 29DEC2017 113214    52.3N  174.6W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

MODERATE EARTHQUAKES IN GUAM AND CHILE

 

EARTHQUAKE SUMMARY FOR DECEMBER 27, 2017

 

Earthquakes of M 5.5 hit the regions south of Guam and in Central Chile today. The stronger of these was an M 5.5 south of Guam. NEIC reported it was felt with intensity II in Guam at Mangilao and Tamuning. There were no reports of damage or casualties with this earthquake. The last earthquake in the region of Guam within about 200 km of this epicenter was an  M 5.8 on November 15, 2017 and prior to that on June 26, 2016 (M 5.5). Only two earthquakes of M>5.5 have occurred in Guam in the past three years since an M 6.7 on September 17, 2014.  This is a relatively quiet period for the region. Forecast 113090 had expected this earthquake to the northwest of this epicenter in Guam around December 28.

 

O: 27DEC2017 23:58:03  12.0N  144.4E Mw=5.5  EMSC   GUAM REGION                  

O: 27DEC2017 23:58:02  12.0N  144.4E mb=5.5  ANSS   Merizo Village Guam

P: 28DEC2017 113090    13.0N  143.0E 4.0-5.6 AAAAA  So. Marianas/Guam           

 

A moderately large earthquake of M 5.4-5.5 also occurred today in Central Chile. The timing of this event within minutes of local solar midnight suggests it may have been triggered by high tidal stresses which maximize at this hour. NEIC reported it was felt with maximum intensity IV in Antofagasta at Calama and II-III in Taltal, Antofagasta and at Copiapo, Atacama and Iquique, Tarapaca, Chile.

CSN reported this earthquake was felt with intensity V in  Taltal, IV Antofagasta, Chanaral, Copiapo, Diego de Almagro, Tierra Amarilla; III Caldera, II Vallenar, La Serena. Felt in Antofagast, Atacama and Coquimbo, Chile. The last earthquake within about 200 km of this epicenter with M>=5.5 occurred as an M 6.1 on July 25, 2016. The only other such earthquake in the past two  years was an M 5.5 on June 24, 2016. Forecasts 113269 amd 113267 had expected this activity at the end of December.

 

O: 28DEC2017 03:54     24.9S   70.2W mb=5.4  GUC    Taltal, IV Antofagasta, Chanar

O: 28DEC2017 03:54:52  24.9S   70.0W Mw=5.5  EMSC   ANTOFAGASTA, CHILE           

P: 27DEC2017 113269    27.0S   71.0W 4.0-5.6 ABAAA  Coast Central Chile        

P: 23DEC2017 113267    24.0S   67.0W 4.0-5.9 BACAA  Argentina                  

 

The active period in Central and northern California continued today. earthquakes of M 3.3 and M 3.4 occurred near Hollister and was felt with maximum intensity IV in Carmel Valley and II-III in Gonzales, Hollister, Salinas, Soledad, Carmel Valley, Monterey, and Santa Clara, California. An M 2.9 aftershock was felt with intensity II-III in Hollister, Salinas, Pacific Grove, Aptos and San Jose, California. The M 3.4 in Central California near this epicenter is the strongest in that series since an M 3.4 on December 15, 2017. The last of larger magnitude was an M 3.8 on November 15, 2017. The strongest earthquake in the current series was an M 4.6 on November 13, 2017. Forecast 113118 expected this event in this area was likely around December 27.

 

O: 28DEC2017 08:57:16  36.7N  121.3W MD=2.6  EMSC   CENTRAL CALIFORNIA

O: 28DEC2017 08:54:13  36.7N  121.3W ML=3.3  EMSC   CENTRAL CALIFORNIA

O: 28DEC2017 02:37:30  36.7N  121.3W MD=2.9  EMSC   CENTRAL CALIFORNIA

O: 27DEC2017 23:48:51  36.7N  121.3W MD=2.5  EMSC   CENTRAL CALIFORNIA           

O: 28DEC2017 01:46:57  36.7N  121.3W MD=2.5  EMSC   CENTRAL CALIFORNIA           

O: 28DEC2017 00:22:45  36.7N  121.3W ML=3.4  EMSC   CENTRAL CALIFORNIA           

P: 27DEC2017 113118    37.1N  121.5W 2.5-4.6 AAAAA  Central California         

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in the Kodiak Island region south of Alaska. It was not reported felt in this remote area.

The last earthquake of M>=4.6 within about 200 km of this epicenter occurred on October 12, 2017 with M 4.9 and prior to that on May 11, 2017 (M 5.2), the only two such events during the past year. Forecast 113211 expected this earthquake within about 100 km of this epicenter was likely around December 27.

 

O: 27DEC2017 23:03:59  56.0N  154.2W ML=3.3  EMSC   SOUTH OF ALASKA               

O: 27DEC2017 22:27:19  56.2N  154.3W mb=4.6  EMSC   KODIAK ISLAND REGION, ALASKA 

P: 27DEC2017 113211    56.0N  155.9W 3.5-5.1 AAAAA  Alaska Peninsula           

 

An unusual earthquake in the U.S. or Canada today was an M 4.1 in the Near Islands of Alaska. It was not reported felt in this remote area. The last  earthquake of M>=4.1 in the Near Islands occurred on November 4 with M 4.2 and prior to that on June 17, 2017. An M 6.0 hit near today's epicenter on December 3, 2016. This is probably an aftershock of that mainshock.  Forecast 113228 expected this event to the east at the end of December.

 

O: 28DEC2017 08:52:11  52.0N  174.0E mb=4.1  EMSC   NEAR ISLANDS, ALEUTIAN ISLANDS

P: 23DEC2017 113228    51.0N  176.0E 4.0-5.8 BABAA  Rat Islands                 

 

MODERATE QUAKE SHAKES SAN FRANCISCO, CALIFORNIA

 

EARTHQUAKE SUMMARY FOR DECEMBER 26, 2017

 

A moderate earthquake of M 3.9 was widely felt today near midnight in the San Francisco, California area. The timing of this earthquake, near local solar midnight when tidal stresses are most prominent, suggests tidal triggering was a prominent factor in this event. NEIC reported it was felt with maximum intensity IV in  San Jose about 10 km from the epicenter and lesser shaking in Milpitas, Santa Clara, Fremont, Alviso, Sunnyvale, Mountain View, Pleasanton, Los Gatos, Morgan Hill, Union city, San Martin, Hayward, Dublin, Menlo Park, Redwood City, San Ramon, Scotts Valley, Aptos, Soquel, Ben Lomond, Felton, Gilroy, San Francisco, California and in general within about 100 km of the epicenter.

An earthquake of M 3.1 shook the area of California earlier in the day south of San Francisco. NEIC reported it was felt with intensity II-III in San Martin, Gilroy, Morgan Hill, San Jose, Santa Clara, Ceres, San Francisco and Fresno, California. There were no reports of damage or casualties from either of these events. Triggering of earthquakes by strong tidal stresses often indicates an area near a strong local event as stresses are near the breaking point. The last earthquake of M>=3.9 in the San Jose/San Francisco area of California was an M 4.1 on October 10, 2017 and prior to that an M 3.9 on August 30, 2016 and August 17, 2015. A strong M 6.0 last hit the region in the Napa area on August 24, 2014 doing extensive damage to the local wine business. Forecast 113119 had expected today's epicenter would be active within about 5 km of this around December 23. This epicenter is at  106 degrees from the M 7.2 in Iran of November 12, a distance at which triggering is considered likely due to concentration of seismic energy off core-mantle boundaries.

 

O: 27DEC2017 06:32:09  37.4N  121.8W Mw=3.9  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 23DEC2017 113119    37.4N  121.8W 2.5-4.7 BAAAA  Central California         

 

The earlier event of M 3.1 had been expected within about 5 km of the epicenter likely around December 27. Activation of this region began on December 24 when  an M 3.3 hit this epicenter. This summary had noted this as the lead article at the time as:

 

"A light earthquake of M 3.3 was felt today in the region of central California south of San Francisco near Morgan Hill. It was reported felt with intensity IV in Watsonville and II-III in San Martin, Morgan Hill, Gilroy, San Jose, and Scotts Valley, California. The last earthquake within about 50 km of this event south of San Francisco, California with M>=3.3 occurred as an M 3.4 on October 26, 2017. Most activity at this level since that time has occurred about 60 km southeast of this in the swarm which has persisted since early November, 2017. 

Forecast 113118 had expected this earthquake within about 10 km of the epicenter was likely around December 27. This epicenter is at the fifth node (72 degrees) from the Samoa/Tonga M 6.8 of November 4 and may have been promoted from that source." (December 24, 2017)

 

O: 24DEC2017 00:31:27  37.1N  121.5W Mw=3.3  EMSC   NORTHERN CALIFORNIA          

P: 27DEC2017 113118    37.1N  121.5W 2.5-4.6 BAAAA  Central California         

 

 

O: 27DEC2017 03:19:36  37.1N  121.5W ML=3.1  EMSC   NORTHERN CALIFORNIA          

P: 27DEC2017 113118    37.1N  121.5W 2.5-4.6 AAAAA  Central California         

 

In North Carolina an earthquake of M 2.7 was widely felt today. NEIC reported intensity II-III in North Carolina at Robbinsville, Fontana Dam, Andrews, Marble, Almond, Hayesville, Murphy, Warne, Franklin, Cullowhee, Waynesville, Clyde, Canton, Candler, Asheville, Etowah, Hendersonville, Fletcher, Fairview, Black Mountain. It was also reported felt in Georgia, South Carolina, Kentucky, Tennessee, Ohio, Missouri, New Jersey, and Ontario, Canada.  The last earthquake with M>=2.7 in North Carolina within about 100 km of this epicenter occurred on August 24, 2017. The last event of significantly larger magnitude in the region was an M 3.0 on December 10, 2013. Forecast 113127 had expected today's earthquake within about 25 km of the epicenter was likely at the end of December. Like the quakes in Poland and California this event was probably promoted by tidal stresses as it occurred within about 15 minutes of local solar noon when tidal stresses are maximized.

 

O: 26DEC2017 17:15:52  35.3N   83.9W MD=2.7  EMSC   NORTH CAROLINA               

P: 30DEC2017 113127    35.0N   84.0W 2.0-4.2 BAAAA  Kentucky/Tennessee/NC      

 

An earthquake of M 4.8 also occurred in Poland today. This is probably a mining-related earthquake (think rockburst or collapse). An aftershock of M 3.7 followed 12 hours later. These event occurred within about 30 minutes of local solar noon (M 4.8) and local solar midnight (M 3.7) and were probably promoted by tidal stresses which maximize at these hours. The last seismic event in Poland within about 200 km of this epicenter with M>=4.8 occurred on December 30, 2010 with M 5.0. Forecast 113226 had expected today's epicenter to be active within about 50 km around December 22. This epicenter is at 143-144 degrees from the last two  strong global earthquakes - in the Loyalty Islands and in Samoa and may have been promoted from those events. Seismic energy is concentrated on the surface after strong earthquakes at this distance due to reflection and refraction  off core boundaries.

 

 

O: 26DEC2017 11:15:30  51.6N   16.1E mb=4.8  EMSC   POLAND                       

O: 26DEC2017 23:33:20  51.6N   16.2E ML=3.7  EMSC   POLAND                        

P: 22DEC2017 113226    51.0N   16.0E 3.0-4.9 BAAAA  Poland                     

 

CENTRAL MEXICO CONTINUES ACTIVE

 

EARTHQUAKE SUMMARY FOR DECEMBER 25, 2017

 

An earthquake of M 5.0 was widely felt today in the region of Guerrero, Mexico. NEIC reported it was felt with maximum intensity VI within about 100 km of the epicenter at Tierra Colorada and Chilpancingo, Guerrero, Mexico and IV in Acapulco and Zacualpan, Guerrero. It was also felt with lesser shaking intensity at Xochitepec, Moreloa, Coatepec, Mexico City, Puebla, Veracruz, Hidalgo, Tabasco, Cacatecas and other areas of central Mexico. The last earthquake in Guerrero, Mexico within about 150 km of this epicenter with M>=5 occurred on August 18, 2017 and prior to that as an M 5.0 on July 23, 2014 – an aftershock of an M 7.2 on April 18, 2014 about 100 km northwest of today's epicenter. Forecast 113088 had expected this event was likely around December 23 with magnitude up to M 5.1.

 

O: 25DEC2017 20:23:10  16.9N   99.8W ML=5.0  EMSC   GUERRERO, MEXICO             

O: 25DEC2017 20:23:10  16.8N   99.8W ML=5.0  UNAM   ESTE de ACAPULCO, GRO *: 16.86°,

P: 23DEC2017 113088    16.0N   99.0W 3.5-5.1 AAAAA  Oaxaca, Mexico             

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 in the Rat Islands of the Aleutians, Alaska. The last earthquake within the Rat Islands of M>=4.1 occurred a month ago on November 28 (M 4.3) and a month before that on October 29, 2017 also with M 4.3. A strong earthquake hit the region with M 6.6 on October 8, 2017. Forecast 113228 had expected today's earthquake within about 100 km was likely around December 26.

 

O: 26DEC2017 02:47:30  51.3N  178.3E mb=4.1  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 26DEC2017 113228    52.0N  178.0E 4.0-6.0 AAAAA  Rat Islands                

 

The strongest earthquake in the world today was an M 5.4 in the Mid-Indian Ridge. It was not reported felt in this remote area. This is the largest event within about 200 km of this epicenter since an M 5.4 on October 22, 2015. The last event with larger magnitude in the area was an M 5.7 on March 26, 2009.

 

O: 25DEC2017 12:02:28  27.9S   74.0E mb=5.2  EMSC   MID-INDIAN RIDGE             

MODERATE QUAKE SHAKES LEEWARD ISLANDS

 

EARTHQUAKE SUMMARY FOR DECEMBER 24, 2017

 

The largest earthquake of the day was an M 5.2 in the northeastern Caribbean. NEIC reported it was felt with maximum intensity V at Netherlands Antilles and IV in Guadeloupe, Anguilla, Saint Kitts and Nevis, Antigua and Barbuda, British Virgin Islands, the U.S. Virgin Islands, and Puerto Rico. Earthquakes in the eastern Caribbean are most common during hurricane season and in December and January. One of the strongest earthquakes in this region in the past 100 years occurred 48 years ago today on December 25, 1969 with M 7.2 (see HISTORY section  of this summary). Some islanders expect increased seismicity at this time of year. In recent years strong earthquakes have hit Puerto Rico (M 6.5) and Haiti (M 7.1) in January. The last earthquakes in the St. Martin region within about 200 km of this epicenter with M>=5.2 occurred on April 17, 2017 (M 5.6) and prior to that on April 30, 2013 with M 5.3. The strongest quake in the region in the past 25 years was an M 5.8 on October 29, 2000 after two moderate foreshocks. Forecast 113080 had expected today's event within about 100 km was likely around December 23.

 

O: 24DEC2017 15:12:53  18.1N   62.8W mb=5.2  EMSC   ST. MARTIN REGION, LEEWARD ISL

P: 23DEC2017 113080    18.0N   64.0W 3.0-5.1 AAAAA  Leeward Islands            

 

An earthquake of M 4.6-4.7 shook areas of western Turkey today. NEIC reported it was felt with intensity II-III in Izmir, Turkey at Foca, Urla, Izmir and in Lesvos, Greece at Varia and Mitilini. It was also felt in Turkey in the areas of Manisa, Balikesir, and Aydin. This is part of a series of events on the Anatolian fault zone this year. The last of these with M>=4.7 occurred as an M 4.7 on August 14, 2017. A strong M 6.3 also hit the area on June 12, 2017.  Forecast 113109 had expected this earthquake within about 50 km of this epicenter was likely around December 24. This activity is located at 144 degrees from  the strong earthquakes in the Loyalty Islands of the past several months and may have been promoted from that source. It is also at 103 degrees from the strong M 8.2 in Chiapas, Mexico of September 8 as well as the continuing aftershocks in that region and was probably promoted from there as well.

 

O: 25DEC2017 05:13:50  38.6N   26.7E ML=4.7  EMSC   NEAR THE COAST OF WESTERN TURK

P: 24DEC2017 113109    39.0N   27.0E 3.0-4.5 AAAAA  Aegean Sea                 

 

The strongest earthquakes in the U.S. or Canada today were a pair of M 4.0 events in southern Alaska in the Kodiak and Kenai regions. The strongest earthquake in the Kodiak region during 2017 was an M 5.5 on August 31 with the last of M>=4 on November 9 with M 4.1 Forecast 113211 had expected this event was likely around December 27.

 

O: 24DEC2017 17:45:31  56.8N  154.4W ML=4.0  EMSC   KODIAK ISLAND REGION, ALASKA 

P: 27DEC2017 113211    56.0N  155.9W 3.5-5.1 BAAAA  Alaska Peninsula           

 

The strongest earthquake of the year in the Kenai Peninsula region was also an M 5.5. This occurred on May 30, 2017. The last of M>=4 in the region was an M 4.4 on November 17. Forecast 113237 had expected today's earthquake around December 26.

 

NEIC reported this earthquake of M 4.0 in the Kenai Peninsula, Alaska was felt with intensity II-III in the area(s) of Homer and Anchor Point, Alaska.

 

O: 24DEC2017 11:21:24  59.5N  151.3W ML=4.0  EMSC   KENAI PENINSULA, ALASKA      

P: 26DEC2017 113237    60.2N  151.7W 3.2-5.1 AAAAA  Central Alaska             

 

LIGHT EARTHQUAKE SHAKES NORTHERN/CENTRAL CALIFORNIA

 

EARTHQUAKE SUMMARY FOR DECEMBER 23, 2017

 

A light earthquake of M 3.3 was felt today in the region of central California south of San Francisco near Morgan Hill. It was reported felt with intensity IV

in Watsonville and II-III in San Martin, Morgan Hill, Gilroy, San Jose, and Scotts Valley, California. The last earthquake within about 50 km of this event south of San Francisco, California with M>=3.3 occurred as an M 3.4 on October 26, 2017. Most activity at this level since that time has occurred about 60 km southeast of this in the swarm  which has persisted since early November, 2017.   Forecast 113118 had expected this earthquake within about 10 km of the epicenter was likely around December 27. This epicenter is at the fifth node (72 degrees)

from the Samoa/Tonga M 6.8 of November 4 and may have been promoted from that source.

 

O: 24DEC2017 00:31:27  37.1N  121.5W Mw=3.3  EMSC   NORTHERN CALIFORNIA          

P: 27DEC2017 113118    37.1N  121.5W 2.5-4.6 BAAAA  Central California         

 

The strongest earthquake in the U.S. or Canada today was an M 4.8 near Sand Point, Alaska  where NEIC reported it was felt with intensity V. This is the same region where an M 4.2 hit yesterday, also the strongest of the day. The last earthquake within about 100 km of this epicenter with M>=4.8 occurred on November 23, 2016 with M 5.1. An event of M 5.7 occurred about 200 km southwest of this on May 28, 2017. This may be a regional aftershock of that mainshock, the largest to date.  Forecast 113233 had expected this area would likely be active around December 27.

 

 

O: 23DEC2017 19:11:00  55.1N  160.4W mb=4.8  EMSC   ALASKA PENINSULA             

P: 27DEC2017 113233    54.5N  161.8W 3.5-5.1 AAAAA  Unimak Islands, Aleutians  

 

An unusual earthquake of M 4.9 occurred in the Arctic Ocean north of Severnaya Zemlya today. It was not reported felt in this remote area. The last earthquake of M>=4.9 north of 80N in the Arctic Ocean in the area north of Asia was an M 4.9 on June 7, 2017. The last of larger magnitude was an M 5.1 occurred on May 13, 2017 with M 5.1. Forecast 113252 had expected this area to be active around December 26. This epicenter is at 105 degrees from the M 6.8 of November 4, 2017 and may have been promoted from that source.

 

O: 23DEC2017 22:13:01  85.4N   91.0E mb=4.9  EMSC   NORTH OF SEVERNAYA ZEMLYA    

O: 23DEC2017 22:13:02  85.4N   90.6E mb=4.9  ANSS   North of Severnaya Zemlya"   

P: 26DEC2017 113252    82.0N  119.0E 4.0-5.6 BCBAA  Arctic Ocean Region        

 

The strongest earthquake in the world today was an M 5.1-5.4 in Papua, Indonesia. BMG reported it at M 5.4 and that it was felt with intensity II-III in Wamena, Genyem and Jayapura, Papua, Indonesia. The last earthquake of M>=5.4 within about 200 km of this epicenter occurred as an M 5.5 on August 14, 2017 and prior to that an M 5.6 on September 24, 2016. An M 7.0 occurred within about  100 km of today's epicenter on July 27, 2015. This may be the second strongest aftershock of that event. It occurred within minutes of local solar midnight

and may have been promoted by strong tidal stresses.  Forecast 113060 had expected today's earthquake in this area around December 22.

 

O: 23DEC2017 14:51:16   2.7S  139.5E mb=5.1  EMSC   NEAR N COAST OF PAPUA, INDONES

O: 23DEC2017 14:51:16  02.8S  139.5E MS=5.4  BMG  Felt with intensity II-III

P: 22DEC2017 113060     4.0S  141.0E 4.0-5.9 ABBAA  Papua New Guinea           

 

 

MODERATE QUAKES IN KAMCHATKA

 

EARTHQUAKE SUMMARY FOR DECEMBER 22, 2017

 

The strongest earthquake in the world today was an M 5.5 in Kamchatka. It was followed by an M 4.9 and M 4.2. These were reported felt with intensity V in Mohovaja, Kamchatka;  and III in Petropavlovsk and Jelizovo, Kamchatka.  The last earthquake of M>=5.5 in Kamchatka within about 100 km of this epicenter was an M 5.5 on November 25, 2016. The only event in this region in the past 11 years of M>5.5 was an M 5.7 on April 14, 2016. An M 5.5 also occurred on August 15, 2010, the only such events since September 1, 2006.  Forecast 113219 had expected today's earthquake in this area was likely around December 24. These epicenters are at the fifth node (72 degrees) from the M 6.8 in Samoa/Tonga of November 4 and may have been promoted from that source.

 

O: 22DEC2017 15:36:36  53.8N  160.5E mb=4.2  EMSC   NEAR EAST COAST OF KAMCHATKA 

O: 22DEC2017 14:44:19  53.9N  160.3E Mw=5.5  EMSC   NEAR EAST COAST OF KAMCHATKA 

O: 22DEC2017 22:28:29  54.0N  160.3E mb=4.9  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 24DEC2017 113219    54.0N  161.0E 4.0-5.5 AAAAA  E. of Kamchatka            

 

The earthquake in the Yukon Territory of Canada reported in the previous summary was felt lightly in the epicentral area according to Earthquakes Canada. That agency also recalibrated the magnitude at M 5.9, the largest in the area in at least 25 years. The report in the previous summary noted:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 5.0 in the northern Yukon Territory, Canada. There were no felt reports for this earthquake but it is likely that an earthquake of this size in this region would have been felt by local inhabitants. The last earthquakes within about 250 km of this epicenter in the Yukon occurred on July 21, 1996; March 1, 1995 and January 5, 1991 all with M 5.0. Forecast 113246 had expected this earthquake was likely within about 50 km around December 26. This earthquake occurred within about an hour or local solar noon and was likely promoted by strong tidal stresses." (December 22, 2017)

 

O: 22DEC2017 08:00:14  65.5N  134.0W Mw=5.0  EMSC   NORTHERN YUKON TERRITORY, CANA

O: 22DEC2017 08:00:13  65.5N  134.1W ML=5.9  NRCA  220 km S   of Fort McPherson

P: 26DEC2017 113246    65.0N  134.0W 2.5-4.0 BAAAA  Yukon Territory, Canada    

 

These earthquakes at high latitudes may have been promoted by the strong geomagnetic storm of December 17-18 as expected in previous summaries as:

 

This storm "may allow stronger seismicity in the period around December 22-25 with the potential for a strong or major quake in this time frame." (December 17-23, 2017)

 

The strongest earthquake in the U.S. today was an M 4.2 in the False Pass area south of Alaska. This earthquake was not reported felt in the epicentral area. The last event within about 100 km of this epicenter with M>=4.2 occurred on August 10, 2017 with M 4.7. Forecast 113233 expected this event in this region around December 26.  

 

O: 23DEC2017 01:49:59  53.6N  162.7W ML=3.6  EMSC   SOUTH OF ALASKA              

O: 23DEC2017 01:49:58  53.8N  162.9W mb=4.2  ANSS   False Pass Alaska

P: 26DEC2017 113233    54.5N  163.5W 3.5-5.2 BAAAA  Unimak Islands, Aleutians  

 

UNUSUAL M 5.0 QUAKE SHAKES YUKON TERRITORY, CANADA

 

EARTHQUAKE SUMMARY FOR DECEMBER 21, 2017

 

The strongest earthquake in the U.S. or Canada today was an M 5.0 in the northern Yukon Territory, Canada. There were no felt reports for this earthquake but it is likely that an earthquake of this size in this region would have been felt by local inhabitants. The last earthquakes within about 250 km of this epicenter in the Yukon occurred on July 21, 1996; March 1, 1995 and January 5, 1991 all with M 5.0. Forecast 113246 had expected this earthquake was likely within about 50 km around December 26. This earthquake occurred within about an hour or local solar noon and was likely promoted by strong tidal stresses.

 

O: 22DEC2017 08:00:14  65.5N  134.0W Mw=5.0  EMSC   NORTHERN YUKON TERRITORY, CANA

P: 26DEC2017 113246    65.0N  134.0W 2.5-4.0 BAAAA  Yukon Territory, Canada    

 

The strongest earthquake in the world was again in the region of Iran today.

NEIC reported this earthquake of M 5.2 in Central Iran was felt with intensity II-III in the area(s) of Kerman at Ravar, Kirman, Ardakan Yazd and in Teheran at Shahriyar and Mahdasht. This is a new epicenter where an M 5.2 was followed by aftershocks of M 4.2 and M 4.3 today. The last earthquake within about 100km of this epicenter was an M 5.4 on February 27, 2012. A series of strong earthquake hit about 100 km southeast of today's earthquake on December 12 and December 1, 2017 with M 5.9-6.0 following a lull period of five years in the vicinity. Forecast 112898 had expected this activity with about 50 km northeast of today's event.

 

O: 21DEC2017 18:33:42  31.3N   56.2E mb=4.3  EMSC   CENTRAL IRAN                 

O: 22DEC2017 02:49:33  31.4N   56.3E ML=4.2  EMSC   CENTRAL IRAN                 

O: 21DEC2017 17:04:47  31.4N   56.3E Mw=5.2  EMSC   CENTRAL IRAN                 

P: 19DEC2017 112898    31.0N   57.0E 3.8-5.3 AAAAA  So. Iran                   

 

ACTIVATION OF JAPAN CONTINUES

 

EARTHQUAKE SUMMARY FOR DECEMBER 20, 2017

 

The region of Japan continued at active seismic conditions today. Following the M 5.5 in Kyushu, Japan reported in the previous issue of this summary, stronger seismicity moved to the Izu Islands south of Tokyo today with a series of moderate events including an M 5.7. Activation of several sections of Iran also continued today with a new epicenter showing activity in northern Iran near Tehran.

 

The activity in the Izu Islands follows a pair of events of M 6.0 and 5.8 which occurred about 350 km north of this on November 9 and 16, 2016. The last earthquake of M>=4 within about 200 km of this was an M 5.3 on July 27, 2017.  The last events of M>=5.7 in this area occurred as quakes of M 6.1 on May 30, 2015 and September 20, 2016. Prior to that the last such event was an M 5.7 on June 28, 2010. Forecast 113140 had expected an earthquake with magnitude up to M 5.8 was likely in this area around December 24.

 

O: 21DEC2017 00:42:35  29.2N  142.5E mb=4.9  EMSC   IZU ISLANDS, JAPAN REGION

O: 21DEC2017 00:40:10  29.2N  142.5E mb=5.0  EMSC   IZU ISLANDS, JAPAN REGION

O: 21DEC2017 03:00:16  29.3N  142.8E Mw=5.7  EMSC   IZU ISLANDS, JAPAN REGION

O: 21DEC2017 01:56:52  29.2N  142.5E Mw=5.2  EMSC   IZU ISLANDS, JAPAN REGION    

P: 24DEC2017 113140    30.0N  141.0E 4.0-5.8 BAAAA  Off East Coast Honshu      

 

A moderate earthquake of M 5.5 also shook the region near Kyushu, Japan today.

NEIC reported this earthquake of M 5.5 in Kyushi, Japan was felt with intensity II-III in the area(s) of Miyazaki, Japan. This is the strongest quake in the area of Kyushu since an M 5.7 on April 29, 2017. No damages or casualties were immediately reported. A strong M 7.0 quake hit the area on April 14, 2016 and this may be an aftershock of that event. Forecast 113129 had expected this event within about 100 km of the epicenter was likely in late December.

 

O: 20DEC2017 15:39:51  30.6N  131.9E mb=4.9  EMSC   KYUSHU, JAPAN

O: 20DEC2017 13:40:55  30.6N  132.0E Mw=5.5  EMSC   KYUSHU, JAPAN

O: 20DEC2017 14:44:59  30.7N  132.0E mb=5.1  EMSC   KYUSHU, JAPAN                

P: 27DEC2017 113129    31.0N  131.0E 3.5-4.9 CAAAA  Kyushu, Japan area         

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in northeastern Canada near Pond Inlet. This is an active region but earthquakes of M 3.9 or greater are relatively uncommon. This is the strongest earthquake near Pond Inlet during 2017. An M 3.2 about 250 km southwest of this occurred December 1. Today's event was not reported felt. The last earthquake of M>=3.9 within about 200 km of today's epicenter occurred on May 22, 2017 about 200 km north of this epicenter and prior to that on August 25, 2016 with M 4.5 about 250 km to the southeast. Forecast 113247 had expected today's event within about 50 km was likely around December 23.   

 

O: 19DEC2017 20:09:42  73.8N   72.3W ML=3.9  NRCA  221 km NE from Pond Inlet     

P: 23DEC2017 113247    73.3N   73.5W 2.5-4.1 BAAAA  Baffin/Davis Strait Canada 

 

A pair of light earthquakes also occurred in the southeastern U.S. today. The larger of these was an M 2.7 in Alabama but an M 2.2 also occurred in South Carolina. Neither was reported felt. Both occurred at the same latitude (34.7-34.8 N) which is somewhat unusual. An earthquake of M 2.4 hit near the South Carolina epicenter on December 2. Four earthquakes have been reported in South Carolina this year by EMSC with M>=2.2. The only other earthquake of M>=2.7 in Alabama this year was an M 2.7 on October 20, 2017. There have been none of larger magnitude in the past year. Forecast 112868 had expected activity in these areas around December 20.

 

O: 20DEC2017 23:55:03  34.7N   86.1W MD=2.7  EMSC   ALABAMA                      

O: 20DEC2017 13:47:26  34.8N   80.5W MD=2.2  EMSC   SOUTH CAROLINA               

P: 20DEC2017 112868    35.0N   84.0W 2.0-4.1 AABAA  Kentucky/Tennessee/NC      

 

The earthquake of M 5.0 in northern Iran was widely felt in the region. NEIC reported this earthquake of M 4.9 in Iran was felt with intensity V in Eslam Shahr, Teheran and IV in Malard, Karaj, Qods, Hashtgerd, Tehran, Qazvin, Qom, Qishlaq, Bicnord, and II-III in the area(s) of GazAab, Qiryat Mal'akhi, Jask, Bicnord, Eilam, Sannandaj, Aslamabad, Ecbatana, Samnan, Resht, Damavand, Sava, Pakdasht, Abyek, Nazarabad-e Bozong, Robot Karim, and Shahriyar, Teheran, Iran and Dubai, UAE;  The last earthquake of M>=5 within about 200 km of this epicenter occurred on January 11, 2012 with M 5.2 and prior to that an M 6.3 on May 28, 2004.   Forecast 112878 had expected this event within about 100 km was likely around December 20.

 

 

O: 20DEC2017 19:57:38  35.7N   51.0E mb=5.0  EMSC   NORTHERN IRAN                

P: 20DEC2017 112878    36.0N   52.0E 3.8-5.2 AAAAA  No. Iran                   

MODERATE QUAKE SHAKES KYUSHU, JAPAN

 

EARTHQUAKE SUMMARY FOR DECEMBER 19, 2017

 

A moderate earthquake of M 5.5 shook the region near Kyushu, Japan today.

This is the strongest quake in the area of Kyushu since an M 5.7 on April 29, 2017. No damages or casualties were immediately reported. A strong M 7.0 quake hit the area on April 14, 2016 and this may be an aftershock of that event. Forecast 113129 had expected this event within about 100 km of the epicenter was likely in late December.

 

O: 20DEC2017 13:40:57  30.6N  132.0E Mw=5.5  EMSC   KYUSHU, JAPAN                

P: 27DEC2017 113129    31.0N  131.0E 3.5-4.9 CAAAA  Kyushu, Japan area         

 

An earthquake of M 3.4 in southern Colorado today was reported by NEIC to have been felt with intensity III in Trinidad, Colorado and possibly in Parker, Colorado. This area became active in August, 2001 and has had continuous activity since that date. The last event in the area of M>=3.4 was an 3.4 on October 10, 2017. Five such quakes have occurred at this site during the past year. Forecast 113123 expected this earthquake within about 50 km of the epicenter was likely around December 23.

 

O: 20DEC2017 04:41:41  37.3N  104.9W ML=3.4  EMSC   COLORADO                     

P: 23DEC2017 113123    37.0N  105.2W 2.0-3.9 BAAAA  Colorado area              

 

A series of light earthquakes also hit in the Coso Junction region of central California today. The largest of these was an M 2.9 but these events were not reported felt. The area occasionally sees swarms such as this and these are not generally indicative of specific upcoming events. Much of this activity today occurred within an hour of local midnight and may have been related to strong tidal promotion. Forecast 112851 had expected this activity was possible around December 21 within about 25 km of the epicenter.

 

O: 20DEC2017 09:14:56  36.0N  118.4W ML=2.2  EMSC   CENTRAL CALIFORNIA           

O: 20DEC2017 08:33:29  36.0N  118.4W ML=2.3  EMSC   CENTRAL CALIFORNIA           

O: 20DEC2017 08:04:35  36.0N  118.4W ML=2.4  EMSC   CENTRAL CALIFORNIA           

O: 20DEC2017 06:59:34  36.0N  118.4W ML=2.8  EMSC   CENTRAL CALIFORNIA           

O: 20DEC2017 08:35:09  36.0N  118.4W ML=2.9  EMSC   CENTRAL CALIFORNIA           

P: 21DEC2017 112851    36.1N  118.1W 2.5-4.6 AAAAA  California/Nevada area     

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in the Rat Islands. Forecast 112965 had expected this event within about 50 km of the epicenter around December 19. The event occurred within about 20 minutes of local solar midnight and was likely triggered by high tidal stresses.

 

O: 19DEC2017 11:42:20  51.6N  178.7E mb=4.0  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 19DEC2017 112965    52.0N  179.0E 4.0-5.7 AAAAA  Rat Islands                

 

TIDAL PROMOTION PROMINENT

 

EARTHQUAKE SUMMARY FOR DECEMBER 18, 2017

 

The new moon arrived today and helped promote some of the largest earthquakes of the day. The largest of these was an M 5.6 in the southern East Pacific Rise but an M 4.0 in Oklahoma, the largest in the lower U.S. and earthquakes, including and M 4.3 in the Yukon of Canada and an M 4.3 in Nepal also appear to have been promoted by strong tidal stresses associated with today's new moon. The promotional tidal seismic forecast had read:

 

 

"The new moon arrived on December 18 at 06:31 UT. Areas which  saw the strongest tidal stresses are near 97 West longitude and 83 East longitude. These include the active areas of coastal Mexico, Oklahoma and Kansas and much of Central

America in the west and Central Asia  and Indonesia in the east. While these areas experience the strongest stresses, tidal promotion is possible and likely in many areas." (December 17-19, 2017)

 

The strongest earthquake in the world today was an M 5.6 on the Southern East Pacific Rise. It was not reported felt in this remote area. This event occurred near local solar midnight and was probably promoted by strong tidal stresses. It is the strongest earthquake within about 200 km of this epicenter since an M 5.7 on February 14, 2014 and prior to that an M 5.8 on November 2, 2013 after eight years of regional quiescence.  Forecast 113274 had expected this event about 200 km to the south was likely around December 24.

 

O: 19DEC2017 05:35:30  21.8S  114.4W Mw=5.6  EMSC   SOUTHERN EAST PACIFIC RISE   

O: 19DEC2017 05:35:29  21.9S  114.2W mb=5.6  ANSS   Southern East Pacific Rise"

P: 24DEC2017 113274    24.0S  115.0W 4.0-5.4 BCAAA  So. East Pacific Rise      

 

The strongest earthquake in the U.S. or Canada today was an M 4.0-4.3 in southeastern Alaska near Haines Junction, Alaska.  NEIC reported this earthquake of M 4.1 in Southeastern Alaska was felt with intensity II-III in the area(s) of Whitehorse, Yukon, Canada and Elfin Cove, Alaska. Earthquakes Canada reported there were no reports of damage with this earthquake. The last earthquake within about 100 km of this epicenter with M>=4.3 occurred on September 16, 2017 with M 5.1 and is the second strongest long-term aftershock of the M 6.2 and 6.3 events of May 1, 2017.  Forecast 112967 had expected this event in this region was likely around December 15.

 

O: 19DEC2017 00:10:15  59.9N  136.7W ML=4.0  EMSC   SOUTHEASTERN ALASKA          

O: 19DEC2017 00:10:15  59.8N  136.7W ML=4.3  NRCA  110 km SE  of Haines Jct.

O: 18DEC2017 22:31:59  59.8N  136.6W ML=3.0  NRCA  107 km WNW of Haines

P: 15DEC2017 112967    59.0N  138.0W 3.0-4.4 BAAAA  Southeast Alaska           

 

The strongest earthquake in the U.S. outside Alaska today was an M 4.0 in the region near Mooreland, Oklahoma. NEIC reported it was felt with intensity IV in Waynoka and Alva, Oklahoma. This is the strongest earthquake in Oklahoma since an M 4.2 occurred with  the full moon on December 5, 2017 and the first of M>=4.0 since that date. Forecast 112902 had expected this event was likely around December 16 in association with the new moon. This event occurred on the longitude of highest tidal stresses with the new moon.

 

O: 19DEC2017 11:26:19  36.5N   98.9W mb=4.0  ANSS   ENE of Mooreland Oklahoma    

P: 16DEC2017 112902    38.0N   99.0W 2.0-4.3 BBAAA  Southern Plains            

 

A second earthquake in as many days also occurred in western Texas with M 2.5. This follows yesterday's M 3.0 in the area which was reported in this summary as:

 

"The event in western Texas is the first of M>=3 within about 150 km of that epicenter  since an M 3.0 on November 10, 2017 of M  3.0. Many of the events in this area occur near full and new moons and are probably tidally driven. Today's event occurred within about an hour of local solar midnight and may have been promoted by strong tidal stresses." (December 17, 2017)

 

Like the event of December 17, today's event occurred about an hour before local solar midnight and was probably promoted by tidal stresses. Forecast 113144 had expected this event within about 50 km was likely around December 25.

 

O: 19DEC2017 04:59:37  31.2N  103.3W mb=2.5  EMSC   WESTERN TEXAS                

O: 19DEC2017 04:59:37  31.2N  103.3W mb=2.5  ANSS   SE of Pecos Texas

P: 25DEC2017 113144    31.6N  103.6W 2.0-4.1 CAAAA  SW U.S.A                   

 

TIDAL STRESSES PROMOTE QUAKES IN MICRONESIA; KENTUCKY

 

EARTHQUAKE SUMMARY FOR DECEMBER 17, 2017

 

The most widely felt earthquake of the day was an M 5.1 in Central Philippines. This earthquake occurred shortly after Tropical Storm Kai-Tak passed near this epicenter. A moderate to large event associated with this storm had been anticipated in this summary as:

 

"TS Kai-Tak continued today east of the Central Philippines with winds up to 40 kts. It is expected to continue to the west passing over the Philippines December 17. This is an active seismic area and a moderate to strong earthquake could be promoted in the Philippines by stresses from this storm during the coming week." (December 14-17, 2017)

 

NEIC reported this earthquake was felt with intensity III in Madrid, Caraga, Philippines. PHIVOLCS  Felt with intensity IV in Burgos, Pilar and Dapa, Surigao Del Norte; III in Dinagat and San Jose, Dinagat Islands and II in Surigao City and Socorro, Surigao Del Norte, Philippines.

 

This earthquake was preceded by an M 4.7 in Mindanao. Both were likely triggered by high tidal stresses. The event in the central Philippines occurred within  about an hour of local solar midnight when tidal stresses maximize. It is also likely it was triggered by an M 5.3 in the State of Yap, Micronesia which  occurred about seven minutes prior to the Philippine event. The last earthquake of M>=5.1 within about 200 km of this epicenter was an M 5.8 on July 10, 2017, an aftershock of an M 6.5 on July 6, 2017 about 150 km northwest of today's epicenter. Forecast 112825 had expected this event was likely within about 50 km of this epicenter in mid-December.

 

O: 17DEC2017 14:32:15  10.4N  126.1E mb=5.1  EMSC   PHILIPPINE ISLANDS REGION    

P: 12DEC2017 112825    11.0N  126.0E 3.5-5.0 BAAAA  Luzon, Philippines         

 

O: 17DEC2017 08:15:28   7.8N  126.7E mb=4.7  EMSC   MINDANAO, PHILIPPINES        

P: 15DEC2017 112790     6.0N  126.0E 4.0-5.4 ABAAA  Mindanao, Philippines      

 

The strongest earthquakes of the day occurred in the State of Yap, Micronesia. This sequence began with an M 5.3 and was followed nine hours later by an M 5.5. The M 5.3 was probably promoted by high tidal stresses as it occurred within about 15 minutes of local solar midnight when tidal stresses maximize. This is continuing activity following strong earthquakes in the area on December 8 and 9, 2017. Forecast 112835 had expected moderate activity south of the Mariana Islands was likely around December 18.

 

O: 17DEC2017 23:41:22  10.0N  140.1E mb=5.5  EMSC   STATE OF YAP, MICRONESIA     

O: 17DEC2017 14:25:17  10.1N  140.4E mb=5.3  EMSC   STATE OF YAP, MICRONESIA     

P: 18DEC2017 112834    12.0N  142.0E 4.0-5.8 ABBAA  So. Marianas/Guam          

 

An unusual earthquake of M 2.8 also occurred in Ohio today. NEIC reported it was felt with intensity II-III in Kentucky at Dover, Augusta, Maysville, California, Winchester, in Portsmouth, and Fairborn, Ohio and Rochester, Indiana. This earthquake which occurred within minutes of local solar noon was probably promoted by strong tidal stresses associated with today's new moon. Tidal stresses maximize near local noon and this epicenter was near the longitude of maximum stress with this new moon as described in earlier summaries:

 

"The new moon will arrive on December 18 at 06:31 UT. Areas which will see the strongest tidal stresses are near 97 West longitude and 83 East longitude. These include the active areas of coastal Mexico, Oklahoma and Kansas and much of Central  America in the west and Central Asia  and Indonesia in the east. While these areas experience the strongest stresses, tidal promotion is possible and likely in many area." (December 17, 2017)

 

Today's earthquake is the largest within about 100 km of the epicenter in Eastern Kentucky since an M 3.6 on February 19, 1995, the only such event in the past 25 years. Forecast 112868 had expected this earthquake in Kentucky to the south of this epicenter around December 21.

 

O: 17DEC2017 05:08:35  38.7N   83.9W MD=2.8  EMSC   EASTERN KENTUCKY             

O: 17DEC2017 05:08:35  38.7N   83.9W md=2.8  ANSS   SSW of Ripley Ohio

P: 21DEC2017 112868    37.0N   83.0W 2.0-3.9 BBAAA  Kentucky/Tennessee/NC      

 

 

OCEAN RIDGES ACTIVE

 

EARTHQUAKE SUMMARY FOR DECEMBER 16, 2017

 

Ocean Ridges showed the most seismic activity today. These included an M 5.4 in  the Fiji Islands, an M 5.2 and 5.0 in the Pacific-Antarctic Ridge and an M 5.3 in the Central Mid-Atlantic. The strongest of these in the Fiji Islands, was an M 5.4 but was not reported felt in the area. The last quake in the Fiji Islands within about 150 km of this epicenter occurred with M 5.5 on November 14 and M 5.7 on November 7, 2017. An M 6.4 hit the region on August 19, 2017. Forecast 112993 expected today's event was likely within about 50 km of the epicenter around December 18.

 

O: 16DEC2017 11:22:24  17.3S  177.5W Mw=5.4  EMSC   FIJI REGION                  

O: 16DEC2017 06:13:44  17.5S  178.6W mb=4.4  EMSC   FIJI REGION                  

P: 18DEC2017 112993    17.0S  178.0W 4.0-5.5 AAAAA  Tonga Islands              

 

An earthquake of M 5.2 on the Pacific-Antarctic Ridge was the second strongest in  the world today. It was not felt in this remote area. It followed an M 5.0 near the same epicenter about 18 hours earlier. The M 5.2 occurred within  about an hour of local solar noon, a time when tidal stresses maximize, and was likely promoted by strong tides associated with the new moon on December 18. This is the strongest earthquake within about 200 km of this epicenter since an M 5.5 on March 2, 2015 and prior to that an M 5.3 on December 30, 2011.

 

O: 16DEC2017 22:40:50  59.6S  151.0W mb=5.2  EMSC   PACIFIC-ANTARCTIC RIDGE      

O: 16DEC2017 05:05:58  59.7S  150.7W mb=5.0  EMSC   PACIFIC-ANTARCTIC RIDGE      

 

An earthquake of M 5.3 also occurred in the Central Mid-Atlantic today. This unfelt earthquake occurred within about an hour of local solar noon and also was probably promoted by high tidal stresses associated with the new moon. The last earthquake of M>=5.3 within the Central Mid-Atlantic and within about 200 km of this epicenter occurred on July 24, 2016 with M 5.4. The last of significantly larger magnitude was an M 5.6 on July 8, 2011.  Forecast 112511 expected today's event within about 15 km of the epicenter was likely around December 10.

 

O: 16DEC2017 14:38:05   0.9N   27.9W Mw=5.3  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P: 10DEC2017 112511     1.0N   28.0W 4.0-5.8 CAAAA  Central Mid-Atlantic Ridg  

 

 

A pair of earthquakes of M 3.0 hit opposite sides of Texas today. These included an M 3.0-3.1 off southeastern Texas near South Padre Island and an M 3.0 in western Texas near Pecos, an active site. While small, the earthquake off eastern Texas was widely felt.

 

The event in western Texas is the first of M>=3 within about 150 km of that epicenter since an M 3.0 on November 10, 2017 of M  3.0. Many of the events in this area occur near full and new moons and are probably tidally driven. Today's event occurred within about an hour of local solar midnight and may have been promoted by strong tidal stresses.  Forecast 112886 had expected the event in western Texas within about 150 km of the epicenter was likely around December 13.

 

 

O: 17DEC2017 05:27:15  31.1N  103.4W mb=3.0  EMSC   WESTERN TEXAS                

P: 13DEC2017 112886    32.6N  104.6W 2.0-4.2 BBAAA  SW U.S.A                   

 

The earthquake in the Gulf of Mexico off southern Texas was also likely promoted by strong tidal stresses. It occurred within about 15 minutes of local solar noon when tidal stresses maximize. The last earthquake of M>=3 recorded in this region within about 200 km of this epicenter was an M 3.9 on April 25, 2010 about 260 km northwest of this epicenter. There have been no earthquake within

200 km of this epicenter of M>=3 in the past 25 years.

 

NEIC reported this earthquake of M 3.0 in Southern Texas was felt with intensity II-III in the area(s) of South Padre Island, Port Isabel, Rio Hondo, Brownsville, Olmito, Corpus Cristi, Donna, Edinburg, Riviera, Portland, Palacios, El Campo, Texas.

 

O: 16DEC2017 18:15:51  26.4N   96.2W ML=3.0  EMSC   GULF OF MEXICO               

O: 16DEC2017 18:15:51  26.4N   96.2W ml=3.0  ANSS   South Padre Island Texas

 

The strongest earthquake in the U.S. or Canada today was an M 3.6 in the western Andreanof Islands, Alaska. It was not reported felt in this remote area. This epicenter is near the antipode of the M 6.5 in the Bouvet Islands two days ago. This summary had suggested this possibility at the time as:

 

"The epicenter (in the Bouvet Islands) is located at the antipode of the western Andreanof Islands (54N 178W) and could help promoted a moderate to large earthquake in that region in the next week." (December 13-14, 2017)

 

Forecast 112953 had expected a moderate quake in this area of the Andreanof Islands was likely around December 13.

 

O: 16DEC2017 08:41:19  51.4N  179.1W ml=3.6  ANSS   Andreanof Islands, Alaska    

P: 13DEC2017 112953    51.8N  178.0W 3.5-5.1 BAAAA  Andreanoff Isls, Aleutians 

 

STRONG EARTHQUAKE FELT IN JAVA, INDONESIA

 

EARTHQUAKE SUMMARY FOR DECEMBER 15, 2017

 

A strong earthquake of M 6.5 hit the region of Java, Indonesia today within a few minutes of local solar midnight and was likely triggered by strong tidal stresses associated with the new moon which arrives on December 18. Tidal stresses maximize near local solar midnight and noon. A strong tropical cyclone passed over this epicenter a week ago. This summary had expected possible strong earthquakes or volcanism in the region of Java possibly promoted by stresses from this storm.

 

"TC Dahlia (01B) continued today south of Java with winds up to 45 kts. It is expected to track to the east over the next several days turning to the south towards Australia and reaching strong storm levels around December 3-4. Seismicity in Sumatra and Java including volcanism at Agung volcano is likely to be at high levels as this storm moves parallel to the subduction zone south of Java." (December 3-6, 2017)

 

NEIC reported the mainshock at M 6.5 was felt with intensity VII in Tarogong, Java; VI in Wengon, Prambanan  and Tasikmalaya, Java; V in Garut, Sidareja, Boyolali, Mranggen, Kroya, Purwokerto, Cisaat. Intensity IV was felt within

about 500 km of the epicenter in communities including Malang, Kedungwaru, Grobol, Depok, Kaliwungu, Sewon, Mlati, Srandakan, Jetis, Mertoyudan, Ciputat, Serpong, Wonosobo, Pekalongan, Rengasdengklok, Ciomas, Karawang, Ciawi, Sukabumi, Adiwerna, Cirebon, Padalarang, Lembang, Batu Jajar, Bandung, Margahayu, Dayeuh Kolot, Cibeureum, Cileunyi, Cikeruh, among others. NEIC reported an aftershock of M 5.0 in Java was felt with intensity II-III in Java at Karang Tengah, Batu Jajar, Bandung, Cileunyi, Lembang, Depok, and Jakarta, Indonesia. This is the strongest earthquake in Java within about 200 km of this epicenter since an M 7.0 about 100 km to the west on September 2, 2009 and prior to that an M 7.7 on July 17, 2006.  Forecast 112806 and 112992 expected this earthquake was likely within this area around December 17. This epicenter is at the fifth node (72 degrees) from the earthquake in Iran of November 12 and the sixth node (60 degrees) from the M 7.0 in the Loyalty Islands and may have been promoted by energy from those events.

 

O: 15DEC2017 16:47:59   7.7S  108.1E Mw=6.5  EMSC   JAVA, INDONESIA              

O: 15DEC2017 16:47:56   7.7S  108.0E mw=6.5  ANSS   ESE of Cipatujah Indonesia

P: 17DEC2017 112806     9.0S  109.0E 4.0-5.4 ABAAA  So. of Java                

P: 17DEC2017 112992    10.0S  108.0E 4.0-5.6 ACAAA  So. of Java                

 

O: 16DEC2017 00:22:32   7.8S  106.9E Mw=5.4  EMSC   JAVA, INDONESIA              

P: 17DEC2017 112992    10.0S  108.0E 4.0-5.6 ACAAA  So. of Java                

 

Several minutes after the mainshock in Java an M 3.8 occurred at the antipode in Northern Colombia. This is not enough time for seismic waves to reach the antipode but electromagnetic or external stresses may have helped this subsequent earthquake at the Colombian antipode.

 

O: 15DEC2017 16:52:27   6.9N   73.2W Mw=3.8  EMSC   NORTHERN COLOMBIA            

P: 19DEC2017 112786     7.0N   73.0W 4.0-5.4 BAAAA  Colombia                   

 

A moderate earthquake of M 5.0-5.1 also occurred in the area southwest of Petatlan, Guerrero, Mexico today.  NEIC reported thi earthquake of M 5.1 in Central Mexico was felt with intensity IV in Zihuatanejo, Guerreo and II-III in the area(s) of Ixtapa, Guerrero and Jiutepec, Morelos, Mexico.  The last earthquake in Guerrero within about 100 km of this epicenter with M>=5 was an M 5.1 on October 25, 2015 and prior to that on September 30, 2015 with  M 5.5. Forecast 112827 had expected this event was likely in this area around December 13. This may have been promoted by strong tidal stresses associated with the new moon as noted in previous summaries:

 

"The new moon will arrive on December 18 at 06:31 UT. Areas which will see the strongest tidal stresses are near 97 West longitude and 83 East longitude. These include the active areas of coastal Mexico, Oklahoma and Kansas and much of Central  America in the west and Central Asia  and Indonesia in the east. While these areas experience the strongest stresses, tidal promotion is possible and likely in many areas." (December 15-16, 2017)

 

 

O: 15DEC2017 23:13:42  17.3N  101.4W ML=5.1  UNAM  l SUROESTE de PETATLAN, GRO *: 17.

O: 15DEC2017 23:13:42  17.4N  101.5W ML=5.0  EMSC   OFFSHORE GUERRERO, MEXICO    

O: 15DEC2017 23:13:28  16.3N  101.0W mb=4.4  ANSS   Jeronimo de Juarez Mexico

P: 13DEC2017 112827    18.0N  102.0W 3.5-5.1 AAAAA  Michoacan, Mexico          

 

MODERATELY LARGE QUAKE IN LOYALTY ISLANDS

 

EARTHQUAKE SUMMARY FOR DECEMBER 14, 2017

 

Moderately large seismicity returned to the Loyalty Islands today with an event of  M 5.5. This event was not reported felt in this remote area. It is part of the strong sequence of events in the past two months which has included an M 6.7  and an M 7.2. The last earthquake of M>=5.5 in this sequence was an M 5.8 on November 20, 2017. Stronger quakes occurred on November 19 with M 7.0 and M 6.8 on October 31. Forecast 113000 had expected today's quake was likely around December 13. This epicenter is at 103 degrees from the M 6.5 in the Bouvet Island region yesterday. Strong concentration of seismic energy from large earthquakes reaches the surface at this distance and can help promote further seismicity in this distance zone.

 

O: 14DEC2017 20:36:46  21.1S  169.6E Mw=5.5  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 13DEC2017 113000    23.0S  169.0E 4.0-5.5 ABAAA  Loyalty Islands            

 

 

An earthquake of M 4.5 occurred near Tokyo, Japan today. NEIC reported it was felt with intensity II-III within about 150 km of the epicenter including in Tokyo, in Kanagawa at Kawasaki, Yokohama, Ayase; in Kawagoe, Saitama and in Fuji, Shizuoka, and in Chiba, Japan. An M 4.4 quake hit several hours later north of this epicenter and was followed by an M 4.7 in Kyushu, Japan. An earthquake of M 4.0 earlier in the day was also felt in Hokkaido, Japan with intensity II in Nayoro, Hokkaido. The last earthquake of M>=4.5 within about 100 km of this Tokyo event was an M 4.5 on September 16, 2017. The last of significantly larger magnitude was an M 4.8 on August 18, 2017, the last of M>=5 was an M 5.1 on August 10, 2017. Forecast 112882 had expected this event within this area was likely around December 12.

 

O: 15DEC2017 02:42:26  35.2N  140.0E mb=4.5  EMSC   NEAR S. COAST OF HONSHU, JAPAN

P: 12DEC2017 112882    35.0N  141.0E 4.0-5.6 BAAAA  Off East Coast Honshu      

 

O: 14DEC2017 19:25:43  44.5N  142.3E mb=4.0  EMSC   HOKKAIDO, JAPAN REGION        

P: 17DEC2017 112916    42.0N  144.0E 3.5-5.6 BCBAA  Hokkaido, Japan            

 

O: 15DEC2017 08:09:33  30.2N  130.8E mb=4.7  EMSC   KYUSHU, JAPAN                

P: 12DEC2017 112869    31.0N  130.0E 3.5-5.0 BAAAA  Kyushu, Japan area         

 

O: 15DEC2017 07:04:42  37.3N  139.3E mb=4.4  EMSC   EASTERN HONSHU, JAPAN        

P: 16DEC2017 112876    37.0N  139.0E 3.5-5.3 AAAAA  No. Honshu, Japan          

 

A moderate earthquake of M 5.1 was widely felt in Guatemala today. NEIC reported this earthquake of M 5.1 in Guatemala was felt with intensity V in Coatepeque, Quezaltenango, Guatemala; IV in Olintepeque, San Juan la Laguna, Escuintla, and Tapachula, Chiapas, Mexico and II-III in the area(s) of Guatemala at Antigua Guatemala, Ciudad Vieja, Nueva Concepcion, San Pablo la Laguna, and Mazatenango, Guatemala. The last earthquake of M>=5.1 in Guatemala within about 100 km of this epicenter occurred on November 4, 2017 with M 5.1. The last of larger magnitude was an M 6.8 on June 22, 2017, half a year ago. Forecast 112820 had expected this event within this area between December 13 and 16.

 

O: 15DEC2017 09:07:48  14.8N   91.2W Mw=5.1  EMSC   GUATEMALA                    

P: 13DEC2017 112820    15.0N   92.0W 3.5-5.2 AAAAA  Guatemala                  

P: 16DEC2017 112820    13.0N   91.0W 3.5-5.3 ABAAA  Guatemala                  

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in the area south of Alaska near the Alaska Peninsula. It was not reported felt in the area.  The M 4.6 was preceded by an M 4.0 earlier in the day about 100 km to the west of the larger event. An M 4.7 hit about 100 km northwest of this epicenter on November 21, 2017 and of M 4.9 on  October 12, 2017. The only other event in the past year in this area of M>=4.6  occurred September 12, 2017 with M 4.6. Forecast 112695 had expected this event within about 10 km was likely in early December. This epicenter is located at the fifth node (72 degrees) from the strong Samoa event of November 4 and may have been promoted from that event. Other events at the fifth node from Samoa today included an M 4.6 south of Alaska, the largest in the U.S. or Canada; an M 3.4 in Central California and an M 3.5 off the coast of northern California, the largest in the U.S. outside Alaska. These were joined by quakes in Japan and Tokyo and an M 4.2 in the Galapagos Islands today.

 

 

O: 15DEC2017 08:38:49  54.8N  156.9W mb=4.6  EMSC   SOUTH OF ALASKA              

P:  4DEC2017 112695    54.7N  156.9W 3.5-5.0 CAAAA  Alaska Peninsula           

P: 20DEC2017 112951    54.8N  158.7W 3.5-5.1 BABAA  Alaska Peninsula           

 

O: 14DEC2017 14:36:27  54.4N  159.5W mb=4.0  EMSC   SOUTH OF ALASKA              

O: 15DEC2017 02:08:02  54.7N  156.9W Ml=3.3  EMSC   SOUTH OF ALASKA              

O: 14DEC2017 18:05:03  57.6N  155.5W ML=3.2  EMSC   ALASKA PENINSULA             

P: 20DEC2017 112951    54.8N  158.7W 3.5-5.1 BAAAA  Alaska Peninsula           

 

STRONG BOUVET ISLAND QUAKE MAY AWAKEN ALEUTIANS

 

EARTHQUAKE SUMMARY FOR DECEMBER 13, 2017

 

A strong earthquake of M 6.4-6.5 occurred today in the Bouvet Island area of the South Atlantic. This is probably a regional aftershock of the M 6.7 which occurred about 500 km to the east of this on October 10, 2017. This is a remote area and this earthquake was not reported felt. The epicenter is located at the antipode of the western Andreanof Islands (54N 178W) and could help promoted a moderate to large earthquake in that region in the next week. This is the strongest earthquake within about 500 km of the epicenter since the October 10 event. Forecast 112776 had expected this earthquake was likely around December 7 within about 100 km of the epicenter. This epicenter is located at 103 degrees from the strong series of quakes in the Loyalty Islands of the past month. It is likely it was promoted from concentrated energy from those events.

 

O: 13DEC2017 18:04:14  54.1S    1.8E Mw=6.5  EMSC   BOUVET ISLAND REGION          

P:  7DEC2017 112776    55.0S    2.0E 4.0-5.6 CAAAA  Atlantic-Indian Ridge      

 

The strongest earthquake in the U.S. today was an M 4.3 in Northern California. NEIC reported it was felt with intensity IV in Westport and Laytonville, California and II-III in Branscomb, Fort Bragg, Leggett, Caspar, Willits, Mendocino, Comptche, Littleriver, Piercy, Albion, Redwood Valley, Elk, Potter Valley, Whitethorn, Covelo, Philo, Redway, Ukiah, Manchester, Boonville, Myesrs Flat and in general within about 75 km from the epicenter. This is the largest earthquake in the Lake Country north of the Geysers within about 50 km of this epicenter in California since an M 4.5 on September 24, 2012 and prior to that an M 4.4 nearer today's epicenter on July 8, 2012. Forecast 112861 had expected this earthquake was likely as a moderate event around December 13. It is located at the fifth node (72 degrees) from the Samoa quake of November 4 (M 6.8) and may have been promoted from that source.

 

O: 14DEC2017 04:57:18  39.6N  123.7W Mw=4.3  EMSC   NORTHERN CALIFORNIA          

P: 13DEC2017 112861    39.7N  123.7W 2.5-4.6 AAAAA  Central California         

 

The earthquake in northern California was part of a regional activation which included an M 4.0 in Oregon. NEIC reported that event was felt with maximum intensity IV in Oregon at Mount Angel, and Molalla and II-III within about 100

km of the epicenter with intensity II-III in areas of Oregon including Scotts Mills, Silverton, Mulino, Canby, Hubbard, Woodburn, Colton, Sublimity, Beavercreek, Salem, Aurora, Salem, Lyons, Stayton, Oregon City, Wilsonville, Salem, West Linn, Tualatin, Sherwood, Portland, Clackamas, Lake Oswego, and Newberg, Oregon. The Oregon and Northern California earthquakes may have been triggered by strong concentrated seismic energy from the M 6.4 in the Bouvet Island area several hours before. These events are located at 140-144 degrees from that epicenter - a distance at which energy reflected and refracted off core boundaries returns in a concentrated form to the surface. Seismicity often increases at this distance shortly after large earthquakes such as occurred in Bouvet Island.

 

The Oregon earthquake is the largest within about 100 km of that epicenter since an M 4.1 on July 4, 2915 and prior to that an M 4.5 on June 20, 2002. The Scotts Mills earthquake of March 25, 1993 did considerable damage in the area and was recorded at the same epicenter as today's event with M 5.6.

 

Forecast 112939 had expected this area would be active in mid-December.

 

O: 14DEC2017 01:24:26  45.0N  122.6W ML=4.0  EMSC   OREGON                       

P: 21DEC2017 112939    45.3N  121.7W 2.0-3.9 CAAAA  Oregon state, U.S.         

 

STRONG EARTHQUAKES CONTINUE IN KERMAN, IRAN

 

EARTHQUAKE SUMMARY FOR DECEMBER 12, 2017

 

Strong earthquakes continued today in eastern Iran. An M 6.0-6.1 in the area of Kerman today is the largest to date in the current swarm. It was felt with intensity VI in Ardakan, Yazd; V in Kirman, Kerman; IV in Zarand Kerman and III in Tehran, Iran. Aftershocks of M 5.0 and 4.5 were reported felt with intensity IV-V in Kerman, Iran. The M 6.1 in this area today is the strongest earthquake within about 200 km of this epicenter since an M 6.3 on February 22, 2005.

Forecast 112588 expected this earthquake in this area was likely around December 11. These earthquakes are at the third node (120 degrees) from the activity in  the Loyalty Islands of the past month which has included an M 7.2 event and were probably promoted from that source.

 

O: 12DEC2017 09:42:23  30.7N   57.2E mb=4.2  EMSC   EASTERN IRAN

O: 12DEC2017 08:43:17  30.7N   57.3E Mw=5.9  EMSC   EASTERN IRAN

O: 12DEC2017 21:55:44  30.7N   57.4E ML=4.3  EMSC   EASTERN IRAN

O: 13DEC2017 00:08:00  30.8N   57.2E mb=4.3  EMSC   EASTERN IRAN

O: 12DEC2017 09:50:27  30.8N   57.3E ML=4.2  EMSC   EASTERN IRAN

O: 12DEC2017 21:41:31  30.8N   57.3E Mw=6.1  EMSC   EASTERN IRAN

O: 13DEC2017 09:51:55  30.8N   57.3E mb=4.4  EMSC   EASTERN IRAN

O: 12DEC2017 21:49:40  30.8N   57.3E mb=5.0  EMSC   EASTERN IRAN

O: 12DEC2017 16:50:21  30.8N   57.4E mb=4.5  EMSC   EASTERN IRAN

O: 12DEC2017 23:27:37  30.8N   57.4E mb=4.5  EMSC   EASTERN IRAN

O: 13DEC2017 04:03:13  30.6N   57.2E mb=4.4  EMSC   EASTERN IRAN                 

P: 11DEC2017 112588    30.0N   57.0E 3.5-4.9 AAAAA  So. Iran/Persian Gulf      

 

A moderate earthquake of M 4.8 was also felt in the region of Oaxaca, Mexico today. NEIC reported it was felt with intensity II in Minatitlan, Veracruz and IV in Oaxaca at Guichicovi and Loma Bonita. It was also felt with intensity II-III in Huayapam, Santa Lucia del Camino, Xadani, nd Mitla, Oaxaca and in Veracruz and Tamiahua, Veracruz, Mexico. Earlier in the day and about 200 km to the south an M 4.9 was felt with intensity II-III in Coatzacoalcos, Veracruz and Oaxaca, Mexico. The Veracruz quake is outside the classical aftershock zone of the September 12 M 8.2. Earthquakes of M>=4.9 occurred in this area on May 20 (M 5.7) and May 25 (M 5.3). The only other such event in the past year in the areas was an M 5.0 on January 25, 2017. Forecast 112553 expected this earthquake within about 50 km of this epicenter was likely around December 10.

 

O: 12DEC2017 22:04:10  14.9N   94.3W ML=4.0  UNAM  al SUROESTE de TONALA, CHIS *: 14.

O: 12DEC2017 19:04:21  16.7N   94.4W ML=4.3  UNAM  l NORESTE de UNION HIDALGO, OAX *:

O: 12DEC2017 08:53:17  14.9N   94.4W ML=4.9  UNAM  al SUROESTE de TONALA, CHIS *: 14.

O: 13DEC2017 05:55:54  16.0N   95.2W ML=4.1  UNAM  l SUR de SALINA CRUZ, OAX *: 16.04

O: 12DEC2017 22:12:10  16.1N   95.3W ML=4.2  UNAM   OESTE de SALINA CRUZ, OAX *: 16.1

O: 12DEC2017 15:34:24  17.5N   95.3W ML=4.9  UNAM  l SUR de J RODRIGUEZ CLARA, VER *:

O: 12DEC2017 14:05:26  16.0N   95.4W ML=4.7  UNAM  l SUROESTE de SALINA CRUZ, OAX *:

O: 12DEC2017 08:53:22  15.3N   94.2W mb=4.9  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 13DEC2017 04:16:37  15.8N   96.1W ML=4.0  EMSC   OAXACA, MEXICO

O: 13DEC2017 05:55:54  16.0N   95.2W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 12DEC2017 14:05:26  16.1N   95.4W ML=4.7  EMSC   OAXACA, MEXICO

O: 12DEC2017 22:12:10  16.2N   95.3W ML=4.2  EMSC   OAXACA, MEXICO

O: 13DEC2017 09:56:09  16.2N   95.6W ML=4.0  EMSC   OAXACA, MEXICO

O: 12DEC2017 19:04:21  16.7N   94.4W ML=4.3  EMSC   OAXACA, MEXICO

O: 12DEC2017 15:34:24  17.7N   95.1W mb=4.8  EMSC   VERACRUZ, MEXICO             

P: 10DEC2017 112553    17.0N   95.0W 3.5-5.4 AAAAA  Chiapas, Mexico            

 

The strongest earthquakes in the U.S. or Canada today occurred in the Vancouver Island and Queen Charlotte Island, British Columbia region of Canada with M 3.6 each. These are not unusual earthquake and were not reported felt.  The last earthquake in the Vancouver region within about 100 km of this epicenter with M>=3.6 occurred November 21, 2017 with M 4.7. This is probably an aftershock

of that event.

 

O: 12DEC2017 11:16:43  49.1N  129.9W ML=3.6  NRCA  249 km WSW of Pt. Hardy       

P: 13DEC2017 112946    49.9N  130.2W 2.8-4.9 AAAAA  Vancouver Island area      

 

The earthquake north of Vancouver near Masset, British Colombia is the first of

M>=3.6 within about 100 km of this epicenter since an M 3.9 on October 26, 2017. The only other such event in this area since May, 2013 was an M 4.4 on August 10, 2017. Forecast 112698 had expected this event was likely around December 8.

 

O: 12DEC2017 08:16:22  54.3N  134.3W ML=3.6  NRCA  147 km W   of Masset          

O: 12DEC2017 08:16:23  54.5N  134.1W ML=3.4  EMSC   QUEEN CHARLOTTE ISLANDS REGION

P:  8DEC2017 112698    54.0N  133.0W 3.0-5.2 BAAAA  British Colombia           

 

DOUBLE WHAMMY IN IRAN

 

EARTHQUAKE SUMMARY FOR DECEMBER 11, 2017

 

Two moderately large earthquakes hit the region of Iran today. These included and M 5.9 and aftershocks in eastern Iran and an M 5.5 on the Iran-Iraq border region and were accompanied by moderately large events in Tonga, Vanuatu and northern Chile. Active seismic conditions today probably reflect the influence of the geomagnetic storm of the past three days as noted in the previous summary:

 

“The Increased seismicity is expected near the geomagnetic equator over the next four days. A strong related earthquake is most likely around December 11-13.”

 

The largest of today’s events was the M 5.9 in Eastern Iran. NEIC reported it was felt with intensity IV in Kerman and II-III in Bam, Yazd, Tabas and possibly in Karaj, Teheran, Iran. This is a region which became active after the M 7.2 of November 12, 2017 along the Iran-Iraq border. The last earthquake within about 200 km of this epicenter with M>=5.9 occurred on December 1, 2017 with M 5.9-6.0, the first such event in the region since an M 6.4 on February 22, 2005. An M 6.6 also hit about 100 km southeast of today's epicenter on March 14, 1998. It is likely that this earthquake was promoted by high tidal stresses. It occurred within about 30 minutes of local solar noon, a time of maximized tidal stresses.  Forecast 112588 expected this epicenter to be active around December 11. This earthquake is located at the third node (120 degrees) from the earthquakes of M 6.7-7.0 in Iran which occurred last month and were probably promoted from that source.

 

O: 12DEC2017 09:42:20  30.8N   57.3E ML=4.2  EMSC   EASTERN IRAN

O: 12DEC2017 09:50:27  30.8N   57.3E ML=4.2  EMSC   EASTERN IRAN

O: 12DEC2017 08:43:18  30.7N   57.3E Mw=5.9  EMSC   EASTERN IRAN                  

P: 11DEC2017 112588    30.0N   57.0E 3.5-4.9 AAAAA  So. Iran/Persian Gulf      

 

A moderate aftershock of M 5.4 also hit the border region of Iran and Iraq today. This is the strongest aftershock in the region since the mainshock of M 7.3 on November 12, 2017. NEIC reported today's event was felt with maximum intensity VI in Irbil, Iraq at Halubjah. It was also felt with intensity II-III in Dezh Shahpur, Kordestan, Iran and III-V in Kusanjaq, Iraq and Naghada and Bane Kordestan, Iran. Lesser shaking in Iraq was felt in Kirkuk, Qal'at Dizah, Balad, Baghdad and Dahuk and in Iran at Orumiyeh, Mehran, Bidjar, Aslamabad, Sannandaj, Iran. An M 4.7 aftershock was reported with intensity IV-V within about 65 km of the epicenter at Pawa, Iran and II-III in Kirkuk, Iraq and Aslamabad, Iran. This may have been triggered by a strong geomagnetic storm which reached high latitude Kp of 6 from 1200-1900 UT. It was during this period when moderately strong earthquakes near the geomagnetic equator occurred in Tarapaca Chile (M 5.5) and in Vanuatu (M 5.7). Forecast 112877 expected this aftershock was likely around December 12, 2017 with magnitude up to M 5.4.

 

O: 11DEC2017 14:09:56  34.9N   45.8E Mw=5.4  EMSC   IRAN-IRAQ BORDER REGION      

O: 11DEC2017 14:42:46  35.0N   45.8E mb=4.9  EMSC   IRAN-IRAQ BORDER REGION      

P: 12DEC2017 112877    36.0N   46.0E 3.8-5.4 AAAAA  No. Iran                   

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 in Northern Alaska northwest of Unalakleet, Alaska. It was not reported felt in this area. This is the strongest earthquake within  about 150 km of this epicenter in northwestern Alaska in more than 7 years – since an M 3.7 on November 9, 2010. The last earthquake in the are of M>3.7 occurred on July 6, 2006 with M 4.8. Forecast 112972 expected this area could be active in mid-December. 

 

O: 12DEC2017 01:02:09  64.4N  162.5W ML=3.7  EMSC   NORTHERN ALASKA              

O: 12DEC2017 01:02:09  64.4N  162.5W ml=3.7  ANSS   NW of Unalakleet Alaska      

P: 21DEC2017 112972    61.3N  158.5W 3.2-5.1 CCCAA  Central Alaska             

 

A moderately large earthquake of M 5.5 also occurred off the coast of northern Tarapaca, Chile today. CSN reported this earthquake was felt with intensity III in  Huara, Pisagua, Pozo Almonte; II Alto Hospicio, Iquique, Felt in Tarapaca, Chile. NEIC reported this earthquake of M 5.5 in Chile was felt with intensity VI in Iquique, Tarapaca and II-III in the area(s) of Arica, Tarapaca, Chile.  This is the strongest earthquake in this region within about 100 km since an M 5.7 on August 14, 2014. Like other activity today this event occurred near the geomagnetic equator and was associated with a strong geomagnetic storm which maximized at this time.  Forecast 112755 expected this event in this area was likely in early December. This event is at the third node (120 degrees) from the Iran events of earlier in the day. It is also at 107 degrees from the Loyalty Islands and may have been promoted from that source.

 

O: 11DEC2017 19:00:56  19.7S   71.1W Mw=5.5  EMSC   OFF COAST OF TARAPACA, CHILE 

O: 11DEC2017 19:40:24  19.7S   71.2W mb=4.0  EMSC   OFF COAST OF TARAPACA, CHILE 

O: 11DEC2017 19:00     19.7S   71.2W mb=5.4  GUC    Huara, Pisagua, Pozo Almonte;

P:  6DEC2017 112755    20.0S   70.0W 4.0-5.4 BAAAA  So. Peru/Bolivia           

 

Another moderately strong earthquake today occurred in northern Vanuatu with M 5.7. This earthquake was not reported felt in the area. It follows an M 4.8 foreshock which occurred on December 9, 2017 to the south of this event. The last earthquake within about 150 km of this epicenter with M>=5.7 was an M 6.8 on May 9, 2017.  Forecast 112995 had expected this event was likely in mid- December.

 

O: 11DEC2017 17:29:12  14.3S  167.4E Mw=5.7  EMSC   VANUATU                       

P: 18DEC2017 112995    15.0S  167.0E 4.0-5.5 CAAAA  Vanuatu Islands            

 

An M 5.6 in Tonga also occurred today.  Like many of the larger events in the region in the past week, this appears to have been promoted by high tidal stresses. It occurred within about an hour of local solar midnight when tidal stresses are maximized. The last earthquake within about 200 km of this epicenter in Tonga was an M 6.0 about 50 km to the south on October 18, 2017 and prior to that an M 5.7 on July 17, 2017. Forecast 112757 had expected this epicenter would be active in early December within about 10 km of this event. This earthquake is at 143 degrees from the M 7.2 in Iran of November 12 (M 7.2), the last major quake in the world. This is a distance at which seismic energy from large events concentrates at the surface and can help promoted further seismicity.

 

O: 11DEC2017 10:50:02  21.0S  173.9W mb=5.6  EMSC   TONGA                        

P:  4DEC2017 112757    21.0S  174.0W 4.0-5.5 BAAAA  Tonga Islands              

 

SOUTHWEST PACIFIC ACTIVE

 

EARTHQUAKE SUMMARY FOR DECEMBER 10, 2017

 

The strongest earthquake of the day was an M 5.6 in the area of Tonga. It was not reported felt in the area. Like many of the larger events in the region in the past week, this appears to have been promoted by high tidal stresses. It occurred within about an hour of local solar midnight when tidal stresses are maximized. The last earthquake within about 200 km of this epicenter in Tonga was an M 6.0 about 50 km to the south on October 18, 2017 and prior to that an M 5.7 on July 17, 2017.  Forecast 112757 had expected this epicenter would be active in early December within about 10 km of this event. This earthquake is at 143 degrees from the M 7.2 in Iran of November 12 (M 7.2), the last major quake in the world. This is a distance at which seismic energy from large events concentrates at the surface and can help promoted further seismicity.

 

O: 11DEC2017 10:50:02  21.0S  173.9W mb=5.6  EMSC   TONGA                        

P:  4DEC2017 112757    21.0S  174.0W 4.0-5.5 CAAAA  Tonga Islands              

 

The second strongest earthquake in the world today was an M 5.3 in the Loyalty Islands. This is an aftershock of the strong events in that region of November, 2017. This earthquake was not reported felt in this remote area. Forecast 113000 had  expected this area would be active around December 13.

 

O: 10DEC2017 17:30:13  21.4S  168.5E Mw=5.3  EMSC   LOYALTY ISLANDS              

P: 13DEC2017 113000    23.0S  169.0E 4.0-5.5 BBAAA  Loyalty Islands            

 

The region of the Fox Islands, Alaska continued to be the most active in the U.S. or Canada today. An M 4.1 in the Fox Islands was not reported felt in this remote area. Over the past several days quakes up to M 5.0 have occurred in the Fox  Islands and this continues that activity. Forecast 112958 had expected this earthquake with magnitude up to M 5.1 within about 100 km of today's epicenter.

 

O: 10DEC2017 18:27:55  52.8N  167.6W mb=4.1  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 14DEC2017 112958    53.5N  167.3W 3.5-5.1 BAAAA  Fox Islands, Aleutians     

 

 

STRONG SEISMICITY CONTINUES IN MICRONESIA

 

EARTHQUAKE SUMMARY FOR DECEMBER 9, 2017

 

An earthquake of M 6.1 in the State of Yap, Micronesia was the strongest event in the world today. It continues a series of strong earthquakes in the area over the past two days as noted in the previous summary:

 

"of the day occurred as an M 6.5 and 6.3 in the State of Yap, Micronesia. The  first of these, an M 6.3 occurred within about half an hour of local solar noon and was probably promoted by tidal stresses which maximize at this time. It is also located on or near the geomagnetic equator and was probably promoted by

the strong geomagnetic storm of the last several days. The last earthquake within  about 200 km of this epicenter with M>=6.5 occurred on January 16, 2005 with M 6.6, the only other such event in the region in the past 25 years.  " (December 8-9, 2017)

 

Like the event of December 8 this earthquake occurred within about 30 minutes of local solar midnight and was probably promoted by tidal stresses which maximize at this time. Forecasts 112572 and 112834 had expected this event around December 7-14 to the northeast of the epicenter as a moderately large event.

 

O:  9DEC2017 15:14:25  10.1N  140.2E Mw=6.1  EMSC   STATE OF YAP, MICRONESIA     

P:  7DEC2017 112572    12.0N  143.0E 4.0-5.5 ABCAA  So. Marianas/Guam          

P: 14DEC2017 112834    11.0N  144.0E 4.0-5.5 BACAA  So. Marianas/Guam          

 

Earthquakes of M 5.0 in the Andreanof Islands and the Fox Islands of the Alaska Aleutian Islands occurred today These were the largest events felt in the U.S. or Canada today but they were not reported felt in these epicentral areas. The last earthquake of M>=5.0 in the Central Andreanof Islands within about 100 km of today's epicenter was an  M M 5.2 on August 1, 2017 and prior to that on May 28, 2017 with M 5.3. Forecast 112697 had expected this earthquake within about 25 km of the epicenter was likely around December 9.

 

O:  9DEC2017 11:00:47  51.5N  176.1W ML=3.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O:  9DEC2017 18:37:36  51.8N  175.1W mb=5.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  9DEC2017 112697    51.7N  175.3W 3.5-5.0 AAAAA  Andreanoff Isls, Aleutians 

 

The M 5.0 in the Fox Islands was the strongest in that island group since an

M 5.3 on August 9, 2017. The only other such events in the area including the Fox Islands in the past year occurred May 24, 2017 with M 5.3 and 5.9. Forecast 112958 had expected this event within about 50 km of the epicenter was likely around December 13.

 

O: 10DEC2017 02:58:44  52.1N  167.2W mb=5.0  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 13DEC2017 112958    51.8N  166.4W 3.5-5.0 BAAAA  Fox Islands, Aleutians     

 

A series of minor earthquakes occurred in Central Colorado today. These events of M 2.8-3.0 may be due to the onset of winter in the region and/or they may be artificial events. The last earthquake of M>=3.0 within about 50 km of this Rocky Mountain site occurred with M 3.4 on July 24, 2016 and prior to that with November 24, 2016 with M 3.2.  Forecast 112605 had expected this activity in the area of central Colorado around December 8. These events are located at 103 degrees from the last major global earthquake - the M 7.2 in Iran of November 12 and may have been promoted by strong seismic energy concentrated at this distance from that source. Other quakes near this distance from Iran today included an M 5.0 in the South Indian Ocean and  events in California and Oklahoma.

 

O: 10DEC2017 03:09:28  37.7N  108.1W ML=2.9  EMSC   COLORADO                     

O: 10DEC2017 02:26:31  37.8N  108.1W ML=2.8  EMSC   COLORADO                     

O: 10DEC2017 03:42:02  37.8N  108.1W ML=3.0  EMSC   COLORADO                     

P:  8DEC2017 112605    38.3N  108.9W 2.0-4.2 AAAAA  Colorado area              

 

STRONG SUB-SOLAR EVENTS IN SAMOA AND VANUATU

 

EARTHQUAKE SUMMARY FOR DECEMBER 8, 2017

 

The strongest earthquake in the world today was an M 5.7-6.0 in the region of Tonga/Samoa. NEIC reported it was felt with intensity II in American Samoa. This was a sub-solar earthquake which occurred when the sun was directly overhead within 15 minutes of local solar noon. These have occurred before in the area of Tonga and have been reported in this summary on numerous occasions but seldom occur at this magnitude level. A second near sub-solar earthquake occurred several hours later in the region of Vanuatu with M 4.8. Like the earthquake in  Samoa this event also occurred within about 15 minutes of local solar noon while the sun was nearly directly overhead (sub-solar).

 

The last earthquake of M>=5.8 in Tonga near Samoa within about 150 km of that event today occurred as an M 6.8 on  November 4, 2017. Today's event is probably a regional aftershock of that mainshock.   Forecast 112993 expected this event within about 25 km of the epicenter was likely around December 13.

 

O:  8DEC2017 23:41:58  16.0S  173.7W Mw=5.8  EMSC   TONGA                        

P: 13DEC2017 112993    16.0S  174.0W 4.0-5.6 BAAAA  Tonga Islands              

 

The earthquake in central Vanuatu is the largest within about 100 km of that epicenter since an M 4.8 on November 8, 2017. The last such event of significantly larger magnitude in the region was an M 5.5 on September 5, 2017. Forecast 112744 had expected this event within about 50 km of the epicenter most likely in early December.

 

NEIC reported this earthquake of M 4.8 in Vanuatu was felt with intensity II-III in the area(s) of Luganville, Sanma, Vanuatu.

 

O:  9DEC2017 01:15:22  15.7S  167.8E mb=4.8  EMSC   VANUATU                      

P:  4DEC2017 112744    16.0S  168.0E 4.0-5.6 BAAAA  Vanuatu Islands            

 

In California today the most active area was Mammoth Lakes near the Nevada border. A series of light earthquakes including events of M 3.5, 3.7 and 3.8 were felt in Mammoth Lakes Oakhurst, Bass Lake, Big Pine, Coarsegold and Bishop with intensity II-III. This represents a considerable increase in regional seismicity which has  included a major continuing swarm near Borrego Springs, southern California and in central California in the past week. The earthquake of M 3.8 was the largest in the Mammoth Lakes region since an M 3.9 on July 9, 2017, the only other such quake in the Mammoth Lakes region during 2017. The last swarm of significantly larger magnitude than today's hit the region on February 15 and 16, 2016 with events starting at M 3.8 and continuing a day later with an M 4.8 and 4.3.  Forecast 112595 had expected today's earthquakes were likely within about 25 km of this epicenter around December 9. Mammoth Lakes is located at 106 degrees from the M 7.2 in Iran of November 12; fourth node (90 degrees) from the Loyalty Islands and the fifth node (72 degrees) from Samoa and may have been promoted by concentrated seismic energy from those events.

 

O: 08DEC2017 22:59:42  37.6N  118.8W MD=2.0  EMSC   CENTRAL CALIFORNIA

O: 09DEC2017 07:09:14  37.6N  118.8W MD=2.2  EMSC   CENTRAL CALIFORNIA

O: 09DEC2017 05:30:12  37.6N  118.8W MD=2.3  EMSC   CENTRAL CALIFORNIA

O: 08DEC2017 22:50:53  37.6N  118.8W ML=2.3  EMSC   CENTRAL CALIFORNIA

O: 09DEC2017 02:27:47  37.6N  118.8W ML=3.3  EMSC   CENTRAL CALIFORNIA

O: 08DEC2017 22:52:53  37.6N  118.8W ML=3.5  EMSC   CENTRAL CALIFORNIA

O: 08DEC2017 17:06:26  37.6N  118.8W Mw=3.7  EMSC   CENTRAL CALIFORNIA

O: 08DEC2017 22:19:17  37.6N  118.8W Mw=3.8  EMSC   CENTRAL CALIFORNIA

O:  8DEC2017 20:35:20  37.5N  118.8W MD=2.2  EMSC   CENTRAL CALIFORNIA           

P:  9DEC2017 112595    37.4N  118.6W 2.5-4.4 AAAAA  California/Nevada area     

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in the Alaska Peninsula. The last earthquake within about 100 km of this epicenter in the Alaska  Peninsula was an M 4.0-4.2 on November 17 and prior to that an M 4.2 on October 12, 2017 after quiet conditions since March, 2017 when an M 4.0 occurred on March 25.  Forecast 112695 had expected an event in the Alaska Peninsula in early December.

 

O:  8DEC2017 18:53:00  57.8N  157.4W mb=3.9  EMSC   ALASKA PENINSULA             

P:  4DEC2017 112695    54.8N  158.7W 3.5-5.1 BCAAA  Alaska Peninsula           

 

NORTHERN EUROPE; MICRONESIA SEE UNUSUAL SEISMICITY

 

EARTHQUAKE SUMMARY FOR DECEMBER 7, 2017

 

Moderate earthquakes in Finland, Poland, the Yap region of Micronesia south of Guam and the Kermadec Islands marked today as an unusual day for seismicity. The largest earthquakes of the day occurred as an M 6.5 and 6.3 in the State of Yap, Micronesia. The  first of these, an M 6.3 occurred within about half an hour of local solar noon and was probably promoted by tidal stresses which maximize at this time. It is also located on or near the geomagnetic equator and was probably promoted by the strong geomagnetic storm of the last several days. The last earthquake within about 200 km of this epicenter with M>=6.5 occurred on January 16, 2005 with M 6.6, the only other such event in the region in the past 25 years. Forecasts 112572 and 112312 had expected regional activity in early December.

 

O:  8DEC2017 02:11:25  10.0N  140.4E mb=4.7  EMSC   STATE OF YAP, MICRONESIA     

O:  8DEC2017 05:37:54  10.1N  140.2E Mw=5.5  EMSC   STATE OF YAP, MICRONESIA     

O:  8DEC2017 09:51:06  10.1N  140.2E Mw=6.3  EMSC   STATE OF YAP, MICRONESIA     

O:  8DEC2017 00:22:54  10.1N  140.2E Mw=6.5  EMSC   STATE OF YAP, MICRONESIA     

P:  7DEC2017 112572    12.0N  143.0E 4.0-5.5 ABBAA  So. Marianas/Guam          

P: 29NOV2017 112312    11.0N  141.0E 4.0-5.6 CAAAA  So. Marianas/Guam          

 

The most unusual earthquake today was an M 3.5 in Finland. As it occurred  within minutes of local solar midnight, it is likely it was tidally promoted by stresses which maximize at this hour. The last earthquake of M>=3.5 in Finland within about 200 km of this epicenter was an M 3.8 on May 22, 1992.  Earthquakes of M 4.5-4.9 occurred in the region in the early 1900's but quiet has persisted in the region in the past 25 years. This event had not been forecast.

 

NEIC reported this earthquake of M 3.5 in Finland was felt with intensity ?IV in Lumijoki, Finland and II-III in the area(s) of Liminka, Oulunsalo, Kempele, Tyrnava, Oulu, Ruukki, ?Hailuoto, Muhos, Kiiminki, and in general within about 500 km of the epicenter.

 

O:  7DEC2017 22:32:11  64.8N   25.3E mb=3.5  EMSC   FINLAND                      

 

An M 4.7 in Poland was widely felt in the area. NEIC reported this earthquake of M 4.5 in Poland was felt with intensity VI in the area(s) of Polkowice, Poland.

This was the strongest earthquake located in Poland within about 200 km of this epicenter since an M 4.7 on August 13, 2016 and prior to that another M 5.7 on March 19, 2013. The location and timing of this event, and others in the area of M 4.7-5.0 suggests they may be artificial or rockbursts related to mining. Forecast 112704 had expected a regional event in Northern Germany of possibly moderate magnitude was likely around December 9.

 

O:  7DEC2017 17:42:50  51.6N   16.1E mb=4.7  EMSC   POLAND                       

P:  9DEC2017 112704    50.0N   12.0E 3.0-4.4 AAAAA  No. Germany                

 

The aftershock zone of the Dodecanese Islands, Greece was also active today. An M 4.5 was felt in western Turkey and the Dodecanese Islands.  NEIC reported this earthquake of M 4.5 in Greece was felt with intensity II-III in the area(s) of Rodos, Dodekanese Islands, Greece. At M 4.5 this is the strongest aftershock of the M 6.6 of July 20, 2017 since July 22, 2017.  Forecast 112593 had expected this event was likely around December 8 within about 100 km of this epicenter.

 

O:  8DEC2017 05:20:39  36.4N   27.7E mb=4.5  EMSC   DODECANESE IS.-TURKEY BORDER R

P:  8DEC2017 112593    37.0N   26.0E 3.0-4.4 AABAA  Aegean Sea                 

 

New Zealand also saw active conditions today. The strongest earthquake in the area was an M 6.2 in the Central Kermadec Islands. This earthquake was not reported felt in this remote area. The last earthquake within about 150 km

of this epicenter with M>=6.2 occurred on June 23, 2014 with M 6.9.

Forecast 112764 had expected this event within about 100 km of the epicenter

around December 3.

 

O:  8DEC2017 02:09:57  30.7S  178.5W Mw=6.2  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P:  3DEC2017 112764    30.0S  179.0W 4.0-5.8 BAAAA  No. Kermadec Islands       

 

 

An M 4.9-5.3 also hit the Nelson region of northwestern South Island today.  GEONET reported this earthquake was felt with light intensity in the northern South Island area. There was 9942 felt reports mostly from northern South Island, New Zealand. These included 4104 of weak shaking. Light intensity was felt by 4061 and moderate intensity by 628 person. Strong severe and extreme shaking was reported by 44, 4 and 1 persons respectively. NEIC reported this earthquake of M 4.3 in South Island, New Zealand was felt with intensity IV in Blenheim and II-III in Nelson, Mapua, Tapawera, Riwaka, Wellington, New Zealand.

The last earthquake of M>=4.9 within about 150 km of this epicenter occurred on February 11, 2017 with M 4.9. The last of M>=5.3 was an M 5.4 on January 5, 017.

Forecast 112771 had expected a moderate event within about 50 km of this epicenter

 was likely around December 11.

 

 

O:  7DEC2017 08:30:14  41.4S  173.4E mb=4.9  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 07DEC2017 08:30:16  41.4S  173.4E MB=5.3  GEONET Felt with light intensity

P: 11DEC2017 112771    42.0S  173.0E 3.0-4.9 BAAAA  So. Island, N.Z.           

 

Three earthquakes of M>3 occurred in Southern California today. These occurred

in the active central California area near San Jose (M 3.2); Santa Monica (M 3.3) and Southern California (M 3.5). The larger of these was an M 3.5 in the Borrego Springs area south of eastern Los Angeles and appears to be an aftershock of the M 4.0 that occurred at that epicenter two days ago.  NEIC reported this earthquake of M 3.5 in Southern California was felt with intensity IV in Julian, California and II-III in the area(s) of Borrego Springs, Ramona, Alpine, Lakeside, Escondido, Valley Center, El Cajon, Escondido and Poway and in general within about 100 km of the epicenter. Forecast 112629 had expected this event within about 25 km of the epicenter was likely in early December.

 

O:  7DEC2017 09:39:38  33.2N  116.5W ML=2.0  EMSC   SOUTHERN CALIFORNIA          

O:  7DEC2017 11:27:20  33.2N  116.5W ML=2.0  EMSC   SOUTHERN CALIFORNIA          

O:  7DEC2017 05:33:35  33.2N  116.5W ML=2.2  EMSC   SOUTHERN CALIFORNIA          

O:  7DEC2017 10:56:17  33.2N  116.5W ML=2.2  EMSC   SOUTHERN CALIFORNIA          

O:  7DEC2017 19:06:07  33.2N  116.5W ML=2.2  EMSC   SOUTHERN CALIFORNIA          

O:  7DEC2017 10:32:47  33.2N  116.5W Mw=3.5  EMSC   SOUTHERN CALIFORNIA          

P:  4DEC2017 112629    33.4N  116.7W 2.5-4.6 AAAAA  So. California             

 

An earthquake of M 3.3 also occurred in the Santa Monica Bay and Malibu Beach area of Los Angeles. It was preceded by an M 2.2 foreshock. As this is an area where a large earthquake may be due, these events could be significant precursors to a larger event to the north. NEIC reported this earthquake of M 3.3 in Los Angeles, California was felt with intensity II-III in the area(s) of Topanga, Calabaa, Agoura Hills, Woodland Hills, West Hills, Malibu, Tarzana, Canoga Park, Oak Park, Winnetka, Encino, Santa Monica, Reseda, Thousand Oaks, Encino, and in general within about 50 km of this epicenter in California.

The last earthquake with M>=3.3 within about 75 km of this epicenter was an M 3.3 on May 25, 2017 and prior to than an M 2.2 on December 27, 2016. The last event in this region of M>3.3 was an M 3.5 on November 5, 2015. Forecasts 112631 and 112634 had expected this activity was likely in early December within about 15 km of these epicenters.

 

O:  7DEC2017 18:55:13  33.9N  118.6W ML=2.2  EMSC   SANTA MONICA BAY, CALIFORNIA 

O: 08DEC2017 08:44:21  34.1N  118.7W ml=3.3  ANSS   Malibu Beach California

O:  8DEC2017 08:44:21  34.1N  118.7W ML=3.3  EMSC   GREATER LOS ANGELES AREA, CALI

P:  2DEC2017 112631    34.0N  118.7W 2.5-4.4 CAAAA  So. California             

P: 11DEC2017 112634    34.3N  118.5W 2.5-4.4 BAAAA  So. California             

 

NEIC reported the earthquake of M 3.2 in Central California was felt with intensity II-III in the area(s) of Gonzales, Soledad, Salinas, San Juan Bautista, Carmel Valley, Mountain View, Fresno, Oakland and Walnut Creek, California.  It is part of the continuing activity and aftershocks of the M 4.0 which hit the area last week. Forecast 112599 had expected this evnet within about 25 km around December 4.

 

O:  7DEC2017 22:07:06  36.5N  121.1W MD=2.0  EMSC   CENTRAL CALIFORNIA           

O:  8DEC2017 03:12:21  36.6N  121.2W MD=2.0  EMSC   CENTRAL CALIFORNIA           

O:  8DEC2017 03:51:05  36.6N  121.2W MD=2.3  EMSC   CENTRAL CALIFORNIA           

O:  7DEC2017 17:00:29  36.6N  121.2W ML=3.2  EMSC   CENTRAL CALIFORNIA           

P:  4DEC2017 112599    36.8N  121.3W 2.5-4.4 BAAAA  Central California         

 

 

MODERATE SEISMICITY IN SO. CALIFORNIA AMONG DESTRUCTIVE FIRES

 

EARTHQUAKE SUMMARY FOR DECEMBER 6, 2017

 

A moderate earthquake of M 4.0-4.2 occurred in Southern California today as was expected at this time. NEIC reported it was felt with maximum intensity V in Warner Springs and with IV in Ranchita, Borrego Springs and II-III in Julian, Santa Ysabel, Descanso, Pine Valley, Ramona, Alpine, Pauma Valley and in general within about 100 km of the epicenter. Aftershocks were reported felt with intensity II-III in Borrego Springs, Ramona, Lakeside, Escondido, El Cajon, Poway, Jamul, and San Diego.  The largest aftershock to this writing was an M 3.6 which was felt with intensity up to IV in the epicentral area. A foreshock of M 2.6 was reported with intensity II in Borrego Springs, El Cajon, Bonita and Idyllwild, California. These events are occurring as a destructive fire destroys many homes in Southern California near Los Angeles. The coincidence of fires and earthquakes in the area may have physical roots. Strong "Santa Ana" winds have long been considered "earthquake weather" in the region. They may be associated with weather systems which promote stronger than normal regional seismicity. At M 4.0 this is the strongest earthquake in southern California (33-35N 115-121W) since an M 4.1 on May 17, 2017 and prior to that an M 4.1 on September 27, 2016.

Forecast 112629 had expected this earthquake was likely within about 35 km of the epicenter around December 4.  A strong geomagnetic storm and high tidal stresses at this time probably helped promote this seismicity.

 

O: 07DEC2017 00:35:16  33.2N  116.5W ML=2.2  EMSC   SOUTHERN CALIFORNIA

O: 07DEC2017 03:57:38  33.2N  116.5W mw=3.6  ANSS   14km NE of Julian

O: 07DEC2017 00:33:15  33.1N  116.5W mw=4.0  ANSS   14km NE of Julian

O: 07DEC2017 00:29:53  33.2N  116.5W ML=2.6  EMSC   SOUTHERN CALIFORNIA

O: 07DEC2017 00:38:03  33.2N  116.5W ML=3.0  EMSC   SOUTHERN CALIFORNIA

O: 07DEC2017 03:57:38  33.2N  116.5W ML=3.8  EMSC   SOUTHERN CALIFORNIA

O:  6DEC2017 08:10:54  33.5N  116.8W ML=2.1  EMSC   SOUTHERN CALIFORNIA          

P:  4DEC2017 112629    33.4N  116.7W 2.5-4.6 AAAAA  So. California             

 

A series of moderate earthquakes in northern India and Pakistan occurred today.

These included an M 5.3 in Pakistan; an M 5.0 in Uttaranchal, India and and M 5.4 in the Kashmir region near the border with China. These may have been promoted by TC Ockhi as suggested in previous summaries:

 

"TC Ockhi (03B) continued today west of India with winds up to 85 kts. It is expected to track past India and to move north west of Peninsular India reaching major storm levels by December 5. Some seismicity in India may be promoted by stresses from this  storm. This is most likely in northern India and in Pakistan and Hindu Kush." (December 3-5, 2017)

 

An earthquake in northern India in the area of Uttaranchal, India was widely felt today. It was reported with maximum intensity V in Rudraprayag, Uttaranchal and IV in Srinagar. It was also felt with intensity II-III in Chamoli and Gopeshwar, Karnaprayang, Tehri, Rishikesh Cantonment, Lensdaun, Virbhadra, Dehra Dun, Clement Town, and other communities within about 400 km of the epicenter in Pradesh, Haryana, Delhi, Uttar Pradesh, and Uttaranchal, India. This is the strongest earthquake in the Uttaranchal area of India within about 200 km of this epicenter since an M 5.0-5.1 on February 6, 2017 and prior to that a similar event on December 1, 2016. The last event of significantly larger magnitude in this area occurred as an M 5.4 on April 4, 2011. Forecast 112608 had expected this event within about 100 km was likely around December 8.

 

O:  6DEC2017 15:19:50  30.7N   79.3E mb=5.0  EMSC   UTTARANCHAL, INDIA           

P:  8DEC2017 112608    30.0N   79.0E 3.8-5.2 AAAAA  India                       

 

The strongest event in this series was an M 5.4 on the Kashmir-Xinjiang border. NEIC reported this earthquake of M 5.1-5.4 in Northern India was felt with intensity II-III in the area(s) of Srinagar, Jammu and Kashmir, India.  It was not immediately reported but probably did light damage in the area. The last event within about 200 km of this epicenter with M>=5.4 occurred on  July 3, 2015 with M 6.4. An event within about 50 km of this epicenter occurred October 20, 2013 with M 5.4. The only other event of significantly larger magnitude in the past 25 years was an M 6.9 on November 19, 1996. Forecast 112620 had  expected this event within about 150 km of this epicenter  around December 8.

 

O:  6DEC2017 23:29:02  35.7N   77.6E mb=5.4  EMSC   KASHMIR-XINJIANG BORDER REGION

P:  8DEC2017 112620    35.0N   75.0E 3.8-5.2 AABAA  Northern India             

 

O:  6DEC2017 23:41:58  27.4N   65.8E Mw=5.3  EMSC   PAKISTAN                     

P:  5DEC2017 112586    29.0N   68.0E 3.5-4.9 ABBAA  Pakistan                    

 

 

An earthquake of M 4.6 also occurred late on December 5 (UT) in the Vancouver Island region of British Columbia, Canada. Earthquakes Canada reported it was lightly felt in the region. This summary reported on this event which was followed by a series of light aftershocks in the previous issue as:

 

"An earthquake of M 4.2 also occurred today in the Vancouver Island region of British Columbia, Canada. The last earthquake in the Vancouver Island region within about 100 km of this epicenter with M>=4.2 was an M 4.7 on  November 21, 2017 and prior to that on July 29, 2017 also with M 4.2. Forecasts 112690 and 112698 had expected this activity in early December. This epicenter is at 90.0 degrees (node 4) from the continuing activity in the Loyalty Islands and was probably promoted from that source." (December 3-4, 2017)

 

Forecast 112698 had expected today's event within about 15 km of the epicenter was likely around December 8.

 

O: 06DEC2017 12:27:30  50.9N  130.6W ML=3.1  NRCA  215 km WSW of Bella Bella

O: 06DEC2017 10:44:25  51.0N  130.5W ML=3.2  NRCA  208 km WSW of Bella Bella

O: 06DEC2017 05:44:41  49.0N  129.6W ML=3.0  NRCA  243 km SW  of Pt. Hardy

O: 06DEC2017 02:50:00  50.5N  130.2W ML=3.3  NRCA  200 km W   of Pt. Hardy

O: 06DEC2017 02:19:33  51.5N  130.7W ML=3.1  NRCA  193 km WSW of Bella Bella

O: 06DEC2017 00:33:45  50.9N  130.6W ML=3.2  NRCA  221 km WSW of Bella Bella

O: 06DEC2017 00:31:44  51.4N  130.7W ML=3.1  NRCA  193 km WSW of Bella Bella

O: 05DEC2017 23:41:58  50.9N  130.6W ML=3.2  NRCA  219 km WSW of Bella Bella

O: 05DEC2017 22:31:14  51.0N  130.6W ML=3.5  NRCA  217 km WSW of Bella Bella

O: 05DEC2017 22:14:14  51.4N  130.8W ML=4.6  NRCA  201 km WSW of Bella Bella

P:  8DEC2017 112698    50.5N  130.4W 3.0-4.9 AAAAA  British Colombia           

 

The strongest earthquake of the day was an M 5.5 in Sulawesi, Indonesia. The last earthquake with M>=5.5 within about 200 km of this epicenter in Sulawesi occurred on September 13, 2015 with M 5.8.  Forecast 112544 expected this event within about 100 km was likely in Sulawesi around December 8. This event at 123 East longitude was at the longitude of maximum tidal stresses of the full moon of December 3 and was probably promoted from those stresses.

 

O:  6DEC2017 16:06:59   0.7S  123.7E Mw=5.5  EMSC   SULAWESI, INDONESIA          

P:  8DEC2017 112544     1.0S  123.0E 4.0-5.4 AAAAA  Sulawesi area              

 

Two other seismic promoters were active over the past several days - a super full moon and a strong geomagnetic storm. This summary had issued notifications in regard to promoted seismicity as follows:

 

"The full moon arrived at 15:47 UT on December 3, 2017. This is a super moon at one of the closest approaches to earth, increasing tidal stresses associated with the alignment. Longitudes under maximum tidal stress center at this time center near 57 West longitude and 123 East longitude. These include in the west, area of the central Atlantic, the western coast of South America, the Caribbean and the eastern coast of the U.S. and Canada and in the east much of the subduction zone of the Pacific and Asian plate including central Indonesia north to Japan." (December 1-5, 2017)

 

and

 

"The geomagnetic field was at active conditions today.  The AP level was 16. High latitude geomagnetic field also saw active conditions with AP at 22. The Increased seismicity is expected near the geomagnetic equator over the next four days. A strong related earthquake is most likely around December 10-12." (December 5-6, 2017)

 

SEISMICITY ACTIVE BUT NO LARGE QUAKES

 

EARTHQUAKE SUMMARY FOR DECEMBER 5, 2017

 

No strong or moderately strong earthquake occurred in the world today. It was an active day in most aftershock regions and earthquake of M 5.0-5.1 were recorded in the Solomon Islands (M 5.1); the Philippines (M 5.0); and in the  Molucca Sea (M 5.1).

 

The strongest earthquake in the world today was an M 5.1 in the Solomon Islands. This event was not reported felt in the region. It occurred within about an  hour of local solar noon. Forecast 112743 had expected this event within about 50 km of the epicenter was likely today, December 5.

 

O:  5DEC2017 23:45:56  10.8S  161.5E mb=5.1  EMSC   SOLOMON ISLANDS              

P:  5DEC2017 112743    11.0S  161.0E 4.0-5.7 AAAAA  Vanuatu Islands            

 

An unusual earthquake of M 4.7 occurred today south of the Fiji Islands. It is unusual because it was almost exactly sub-solar at the time of the event. The event occurred within several minutes of local solar midnight with the sun directly over head. Forecast 112757 expected this earthquake was likely around December 3.

 

O:  5DEC2017 12:01:13  23.4S  179.7W mb=4.7  EMSC   SOUTH OF FIJI ISLANDS        

P:  3DEC2017 112757    23.0S  176.0W 4.0-5.5 AACAA  Tonga Islands              

 

O:  6DEC2017 02:48:24  11.2N  125.7E mb=5.0  EMSC   SAMAR, PHILIPPINES           

P:  6DEC2017 112561    11.0N  125.0E 3.5-5.1 AAAAA  Luzon, Philippines         

 

The strongest earthquake in the U.S. today was an M 3.9 in Southern Alaska. NEIC reported it was felt with intensity II-III in Alaska at Wasilla, Chugiak, Elmendorf, Anchorage, Eagle River, Girdwood, Talkeetna and Palmer, Alaska.

 

The strongest activity in Canada occurred in the Queen Charlotte Islands Region where two events of M 4.0 occurred. The first of these occurred within about 30 minutes of local solar noon and was probably promoted by tidal stresses which maximize at this hour. The last earthquake in the Queen Charlotte Islands region with M>=4 occurred August 10, 2017 with M 4.3. The only other such event this year was an M 4.1 on March 29, 2017. Forecast 112698 had expected this activity within about 100 km of this epicenter was likely around December 8.

 

O: 05DEC2017 13:44:34  48.9N  129.5W ML=3.4  NRCA  250 km SW  of Pt. Hardy

O:  5DEC2017 22:14:16  51.6N  130.6W mb=4.0  EMSC   QUEEN CHARLOTTE ISLANDS REGION

O:  5DEC2017 21:14:00  51.7N  130.5W ML=4.0  EMSC   QUEEN CHARLOTTE ISLANDS REGION

P:  8DEC2017 112698    50.5N  130.4W 3.0-4.9 BBAAA  British Colombia           

 

Another moderate earthquake of M 4.6-4.8 occurred today in North Island, New Zealand. GEONET reported it was felt with light intensity northeast of Whanganui 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 739 people reported feeling this earthquake with 542 reports of weak intensity; 177 of light intensity; 18 with moderate intensity; 2 with strong intensity; and 0 of severe intensity. NEIC reported this earthquake of M 4.6 in North Island, New Zealand was felt with intensity II-III in the area(s) of Rongotea, Manawatu-Wanganui and Wellington, New Zealand.  The last earthquake within about 100 km of this epicenter with M>=4.6 occurred November 7, 2016 with M 4.8. The last of M>=4.9 was an M 5.3 on November 1, 2015. Forecast 112765 had expected today's event in this area around December 7. This earthquake occurred within about 30 minutes of local solar noon and was probably promoted by high tidal stresses.

 

O: 06DEC2017 00:56:45  39.0S  174.9E MS=4.9  GEONET Felt with light intensity

O:  6DEC2017 00:56:47  39.0S  175.0E mb=4.6  EMSC   NORTH ISLAND OF NEW ZEALAND  

P:  7DEC2017 112765    39.0S  174.0E 3.0-4.5 AAAAA  North Island, N.Z.         

 

 

 

FULL MOON SEISMICITY CONTINUES ACTIVE

 

EARTHQUAKE SUMMARY FOR DECEMBER 4, 2017

 

The full moon arrived at 15:47 UT on December 3, 2017. This is a super moon at one of the closest approaches to earth, increasing tidal stresses associated with the alignment. Longitudes under maximum tidal stress center at this time center near 57 West longitude and 123 East longitude. These include in the west, area of the central Atlantic, the western coast of South America, the Caribbean and the eastern coast of the U.S. and Canada and in the east much of the subduction zone of the Pacific and Asian plate including central Indonesia north to Japan.

 

Much of the larger activity in the world today occurred near the time of local solar midnight and local solar noon, times when promoted seismicity is most likely from tidal events. Some of these included an M 5.3 in the Timor region of Indonesia; an M 5.0 in Taiwan; an M 4.0 in Baja California, an M 4.8 in  the Alaska Peninsula and an M 4.2 in Oklahoma.

 

The largest earthquake in the world today was an M 5.3 in the Timor region of Indonesia. BMG reported it was felt with intensity I-II in Maumere, Flores, Indonesia. As this occurred at the longitude of highest tidal stresses on the day of the full moon (123 degrees East Longitude), it is likely it was promoted by strong tidal stresses. The last earthquake in the Flores area with M>=5.3 occurred on October 20, 2016 with M 5.3.  Forecast 112731 had expected today's earthquake was likely within about 100 km of this epicenter around December 7.

 

O:  4DEC2017 11:52:23   9.6S  123.0E mb=5.3  EMSC   TIMOR REGION, INDONESIA      

O: 04DEC2017 11:52:25  09.9S  123.0E MS=5.2  BMG  Felt with intensity I-II

P:  7DEC2017 112731    10.0S  124.0E 4.0-5.8 BAAAA  Flores Island area         

 

The second strongest quake of the day, an M 5.0 in Taiwan, also occurred near 123 degrees east longitude and was probably tidally promoted. Forecast 112589 had expected this event was likely around December 9.

 

CWB reported this earthquake was felt with intensity III in Taitung and I in Pingtung Counties, Taiwan.

 

O:  4DEC2017 08:59:37  21.7N  121.5E mb=5.0  EMSC   TAIWAN REGION                

O:  4DEC2017 08:59:41  22.0N  121.3E ML=4.7  TAI    Hualien, Taiwan              

P:  9DEC2017 112589    21.0N  122.0E 4.0-5.4 BAAAA  Taiwan                     

 

An M 4.8 in the Alaska Peninsula today was the largest earthquake in the U.S. or Canada. This event was followed by an M 3.5 aftershock and has been updated from the report in the previous issue of this summary:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.3 in the Alaska Peninsula. It was not reported felt in this remote area. The earthquake occurred within about 10 minutes of local solar midnight and was probably promoted by

strong tidal stresses which maximize at this hour. The last earthquake within  about 100 km of this epicenter with M>=4.3 was an M 4.9 on October 12, 2017 and prior to that on September 12, 2017.  Forecast 112695 had expected this event was likely around December 4.  This epicenter is at 72 degrees (node 5) from the activity in the Tonga/Samoa Islands of November 4, 2017 and was probably promoted from that source." (December 3-4, 2017)

 

O:  4DEC2017 10:23:34  55.9N  156.1W mb=4.8  EMSC   SOUTH OF ALASKA               

P:  4DEC2017 112695    54.7N  156.9W 3.5-5.0 ABAAA  Alaska Peninsula           

 

O:  5DEC2017 06:10:36  55.1N  157.6W Ml=3.5  EMSC   ALASKA PENINSULA             

P:  4DEC2017 112695    54.8N  158.7W 3.5-5.1 AAAAA  Alaska Peninsula           

 

The strongest earthquake in the U.S. or Canada outside Alaska today was an M 4.2 in Oklahoma. NEIC reported it was felt with maximum intensity IV in Oklahoma at Morrison, Perry, Pawnee, Tulsa, Oklahoma City, and in most areas of Oklahoma and Kansas within about 250 km of the epicenter. It was reported felt as far as Missouri and Nebraska. Other quakes in Oklahoma today included an M 2.8 felt lightly in Stillwater;  The M 4.2 occurred within near local solar midnight and was probably promoted by stresses and fluid motions associated with the full moon which maximize around this time. This summary has long held the position that much of the activity in the central Plain States of the U.S. is promoted tidally. For example in the issue at the time of the last new moon on November 20, 2017:

 

"Larger earthquakes in the central plains states of the U.S. began occurring in 2009 and have tended to coincide with new and full moons. The last of M>3.7 was an M 4.1 coinciding with the Loyalty Islands mainshock of October 31. Oklahoma is located at 103 degrees from the Loyalty Islands and from the M 7.2 in the Iran/Iraq border of November 12, a distance at which effects of distant  earthquakes is maximized. This may have helped promoted today's earthquake." (November 20, 2017)

 

The last earthquake in Oklahoma of M>=4.2 coincided with the great Chiapas earthquake on September 8, 2017 with M 4.3. Forecast 112643 had expected an event up to M 4.2 in Oklahoma was likely within about 50 km of today's epicenter.

 

 

O:  5DEC2017 04:53:51  36.4N   97.1W mb=2.8  EMSC   OKLAHOMA                     

O:  5DEC2017 04:26:38  36.4N   97.2W Mw=4.2  EMSC   OKLAHOMA                     

O:  5DEC2017 00:31:59  36.6N   98.6W mb=2.8  EMSC   OKLAHOMA                     

P:  4DEC2017 112643    36.0N   97.0W 2.0-4.2 AAAAA  Southern Plains            

 

A moderate earthquake also occurred in Baja California south of Southern California today with M 3.7-4.0. It was not reported felt in this area. This summary had expected a moderate quake in southern California at this time due to a long-term relation between moderate earthquakes in Delaware and subsequent events in Southern California.

 

The last earthquake in southern or Baja California of M>=4 (a moderate earthquake) occurred on July 29, 2017 (M 4.3) and is only the second in the Baja region of M>=4 during 2017. Moderate quakes occurred about 600 km to the northwest with M 4.3 and 4.1  off the coast of central California on October 26 and May 17, 2017 completing the list of such events in southern California or off the coast during 2017. Forecast 112626 had expected this event within about 25 km of the epicenter as likely to occur around December 5. This event occurred within about 15 minutes of local solar midnight on the day of the full moon. As tidal stresses are maximized at this hour, it is likely this quake was promoted by these stresses. Like the M 4.8 south of Alaska this earthquake is located at 72 degrees (node 5) from the Samoa event of November 4 and may have been promoted by energy from that event.

 

O:  5DEC2017 07:31:44  31.8N  116.1W ML=3.7  EMSC   BAJA CALIFORNIA, MEXICO      

O: 05DEC2017 07:31:46  31.7N  116.1W ML=4.0  UNAM  l ESTE de RODOLFO SANCHEZ T(MRO),

P:  5DEC2017 112626    31.9N  116.3W 2.5-4.4 AAAAA  So. California              

 

An earthquake of M 4.5 also occurred early on December 4 (UT) in the Vancouver Island region of British Columbia, Canada. Earthquakes Canada reported it was

lightly felt in the region. This summary reported on this event which was followed by a series of light aftershocks in the previous issue as:

 

"An earthquake of M 4.2 also occurred today in the Vancouver Island region of British Columbia, Canada. The last earthquake in the Vancouver Island region within about 100 km of this epicenter with M>=4.2 was an M 4.7 on  November 21, 2017 and prior to that on July 29, 2017 also with M 4.2. Forecasts 112690 and 112698 had expected this activity in early December. This epicenter is at 90.0 degrees (node 4) from the continuing activity in the Loyalty Islands and was probably promoted from that source." (December 3-4, 2017)

 

Forecast 112698 had expected today's event within about 15 km of the epicenter was likely around December 8.

 

O: 04DEC2017 04:43:10  50.5N  130.3W ML=3.1  NRCA  205 km W   of Pt. Hardy

O: 04DEC2017 03:57:37  50.5N  130.2W ML=3.2  NRCA  198 km W   of Pt. Hardy

O: 04DEC2017 03:56:48  50.5N  130.2W ML=3.5  NRCA  200 km W   of Pt. Hardy

O:  4DEC2017 03:51:41  50.4N  130.3W ML=4.5  NRCA  207 km W   of Pt. Hardy       

P:  8DEC2017 112698    50.5N  130.4W 3.0-4.9 BAAAA  British Colombia           

 

STRONG TIDAL PROMOTION OF SEISMICITY WITH FULL SUPER-MOON

 

EARTHQUAKE SUMMARY FOR DECEMBER 3, 2017

 

A strong earthquake of M 6.0 in Ecuador was among a series of apparently tidally promoted events today. Most of these occurred near the Greenwich Meridian (zero longitude) or the IDL (180 degrees longitude) near local solar midnight and may involve remnant tidal stresses from the last new moon combined with stresses from today's super-moon. Among those which occurred within about 40 minutes of local solar midnight or noon were an M 4.3 South of Alaska; an M 5.0 in Taiwan, an M 4.6 in Molucca; an M 4.3 in Oaxaca, Mexico; an M 2.9 in Oklahoma; an M 5.5 in Vanuatu; an M 5.7 in the Kermadec Islands; an M 4.2 in Central Italy. This is a significant number of events with most of the largest earthquakes of the day included in this list.

 

The earthquake in Ecuador was widely felt with maximum intensity VI (slight damage) felt within about 150 km of the epicenter. NEIC reported intensity VI in Bahia de Caraquez and Rocafuert, Manabi, Ecuador and at Palestina, Guayas, Ecuador. Intensity V was reported from Santo Domingo, Manta, Quevedo, with IV around 200 km from the epicenter at Eloy Alfaro, Guayaquil, Santa Elena, Machachi. Lesser shaking of II-III was reported from most regions of Ecuador

including at Manabi, Los Rios, Pichincha, Guayas, Cotopaxi, Imbabura, Azuay, El Oro, and Tungurahua, Ecuador and Valle del Cauca, Colombia.  This is the strongest earthquake of the year 2017 to occur near Ecuador. An M 6.1 of June 30 was the previous strongest. That event occurred within about 25 km  of today's epicenter. Forecast 112527 had expected today's event within about  100 km of this epicenter was likely around December 4. This epicenter is at the third node (120 degrees) from the M 7.2 in Iran of November 12 and at 108 degrees from the continuing activity in the Loyalty Islands and was probably promoted by seismic energy from those events.

 

O:  3DEC2017 11:19:07   0.4S   80.3W Mw=6.2  EMSC   NEAR COAST OF ECUADOR        

O: 03DEC2017 11:19:06   0.5S   80.3W mw=6.0  ANSS   Bahia de Caraquez Ecuador

O:  3DEC2017 15:16:33   0.4S   80.4W ML=4.0  EMSC   NEAR COAST OF ECUADOR        

P:  4DEC2017 112527     1.0S   81.0W 4.0-5.6 AAAAA  Ecuador                    

 

A moderately strong earthquake was also recorded in the southern Kermadec Islands of New Zealand today with M 5.7. It was not reported felt in this remote area. This event occurred within about 15 minutes of local solar noon and was nearly sub-solar at the time of occurrence. It was likely promoted by strong tidal stresses at this time. The last earthquake within  about 150 km of this epicenter in the Kermadec Islands with M>=5.7 occurred more than a year ago on September 25, 2016 with M 5.9 and prior to that on March 1, 2016 (M 5.7). The last strong quake in the region was an M 6.2-6.4 on September 7, 2015. Forecast 112767 had anticipated this event was likely around December 3. This earthquake is located at 144 degrees from the M 7.2 in Western Iran of  November 12, a distance at which concentrated seismic energy can help promote seismicity.

 

O:  4DEC2017 00:08:06  32.8S  178.3W Mw=5.7  EMSC   SOUTH OF KERMADEC ISLANDS    

P:  3DEC2017 112767    31.0S  179.0W 4.0-5.6 ABAAA  So. Kermadec Islands       

 

An event in the Vanuatu region of M 5.5 also occurred today. It occurred within about half an hour of local solar noon and was nearly sub-solar at the time of occurrence. It was preceded by an M 4.8 about 25 km to the south. The last earthquake of M>=5.5 within about 150 km of these epicenters occurred on March 5, 2014 with M 6.3. The last shallow focus regional event was an M 5.7 on August 18, 2012 and prior to that an M 5.9 on March 19, 2006.  Forecast 112744 expected a moderate regional quake around December 4.

 

O:  4DEC2017 01:35:01  13.9S  170.4E Mw=5.5  EMSC   VANUATU REGION               

O:  3DEC2017 23:34:09  14.1S  170.4E mb=4.8  EMSC   VANUATU REGION               

P:  4DEC2017 112744    16.0S  168.0E 4.0-5.6 ABBAA  Vanuatu Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 4.3 in the Alaska Peninsula. It was not reported felt in this remote area. The earthquake occurred within about 10 minutes of local solar midnight and was probably promoted by strong tidal stresses which maximize at this hour. The last earthquake within  about 100 km of this epicenter with M>=4.3 was an M 4.9 on October 12, 2017 and prior to that on September 12, 2017.  Forecast 112695 had expected this event was likely around December 4.  This epicenter is at 72 degrees (node 5) from the activity in the Tonga/Samoa Islands of November 4, 2017 and was probably promoted from that source.

 

O:  4DEC2017 10:23:35  55.8N  156.0W ML=4.3  EMSC   SOUTH OF ALASKA              

P:  4DEC2017 112695    54.7N  156.9W 3.5-5.0 ABAAA  Alaska Peninsula           

 

An earthquake of M 4.2 also occurred today in the Vancouver Island region of British Columbia, Canada. The last earthquake in the Vancouver Island region within about 100 km of this epicenter with M>=4.2 was an M 4.7 on  November 21, 2017 and prior to that on July 29, 2017 also with M 4.2. Forecasts 112690 and 112698 had expected this activity in early December. This epicenter is at 90.0 degrees (node 4) from the continuing activity in the Loyalty Islands and was probably promoted from that source.

 

O:  4DEC2017 03:51:44  50.7N  129.9W mb=4.2  EMSC   VANCOUVER ISLAND, CANADA REGIO

O: 04DEC2017 03:51:44  50.6N  129.9W mb=4.2  ANSS   Port Hardy Canada

P:  3DEC2017 112690    49.2N  129.1W 2.8-4.9 ABAAA  Vancouver Island area      

P:  8DEC2017 112698    50.5N  130.4W 3.0-4.9 BAAAA  British Colombia           

 

A moderate earthquake today of M 4.0 in Spain was somewhat unusual. It was the strongest earthquake in Spain within about 150 km of this epicenter in nearly three years - since an M 5.0 on February 23, 2015 and prior to that an M 4.4 on January 31, 2012. Forecast 112612 had expected this area would see a moderate quake around December 5.

 

O:  4DEC2017 08:47:19  38.7N    1.0W ML=4.0  EMSC   SPAIN                         

P:  5DEC2017 112612    38.0N    2.0W 3.5-5.2 AAAAA  Morocco/Spain              

 

An earthquake of M 4.6 in Central Italy was also felt near local solar midnight today and was probably tidally promoted.  NEIC reported this earthquake of M 4.1 in Central Italy was felt with intensity IV in L'Aquila and II-III in the area(s) of Mosciano Sant'Angelo and Montefino, Italy.  This is the strongest regional event in central Italy since an M 5.7 on January 18, 2017 when the mainshock hit the area. That event had also been suggested in this summary to have been promoted by full moon tidal stresses. Forecast 112658 had expected today's event was likely in early December.

 

O:  3DEC2017 23:34:11  42.6N   13.3E mb=4.6  EMSC   CENTRAL ITALY                

P:  9DEC2017 112658    43.0N   14.0E 3.0-4.9 CAAAA  Italy                      

 

MODERATE QUAKES ON QUIET DAY

 

EARTHQUAKE SUMMARY FOR DECEMBER 2, 2017

 

It was a relatively quiet day in global seismicity. This may change shortly as a major geomagnetic storm is expected tomorrow and could help promote stronger seismicity. The largest earthquakes of the day were of M 5.0-5.1 and occurred in the Jan Mayen Islands; in Iran; in DR Congo and in the Kermadec Islands of New Zealand. The M 5.0 in Jan Mayen Islands north of Scandinavia is the largest within about 200 km of that epicenter since an M 5.3 on October 21, 2017 and prior to that an M 5.0 on September 3, 2016. A strong earthquake near today's epicenter occurred with M 6.7-6.8 on August 30, 2012. This appears to be an aftershock of that mainshock.  It was not reported felt in this remote area. Forecast 112466 expected this event within about 50 km of this epicenter was likely around November 30.

 

O:  2DEC2017 16:40:46  71.6N   10.5W Mw=5.0  EMSC   JAN MAYEN ISLAND REGION      

P: 30NOV2017 112466    71.0N   14.0W 3.5-4.9 AAAAA  Jan Mayen Isl. area        

 

The M 5.1 in Iran was an aftershock of the M 6.0 there on December 1. It was accompanied by a series of smaller aftershocks. Forecasts 112638 and 112384 had expected this activity in late November and early December.

 

NEIC reported this earthquake of M 5.1 in Kerman, Iran was felt with intensity IV in the area(s) of Kerman, Iran.

 

O:  2DEC2017 05:50:54  30.7N   57.4E ML=4.4  EMSC   EASTERN IRAN                 

O:  3DEC2017 02:47:27  30.7N   57.4E mb=4.2  EMSC   EASTERN IRAN                  

O:  2DEC2017 20:59:22  30.8N   57.4E ML=4.2  EMSC   EASTERN IRAN                 

P:  9DEC2017 112638    31.0N   57.0E 3.8-5.4 CAAAA  So. Iran                   

 

O:  2DEC2017 10:47:04  30.8N   57.4E Mw=5.1  EMSC   EASTERN IRAN                 

P: 23NOV2017 112384    31.0N   57.0E 3.8-5.4 CAAAA  So. Iran                   

 

The M 5.0 in the Kermadec Islands, like the event in the Andreanof Islands occurred at the longitude of highest tidal stresses at the last new moon as noted in previous summaries:

 

"The new moon will arrive at 11:42 UT on November 18. Areas which are sub-solar at this time are near 5 degrees east longitude while those which area anti-solar are near 175 degrees west longitude. These include the Samoa/Tonga/Fiji/New Zealand areas and the Aleutians near the IDL" (November 16-24, 2017)

 

This area has been quiet in recent months. The last quake of M>=5 within about

150 km of this epicenter occurred July 14, 2017 with M 5.1. Forecast 112486 expected this event was likely towards the end of November within about 100 km of this epicenter. This epicenter is at 143 degrees from the M 7.2 in Iran of November 12 and may have been promoted from that source.

 

O:  2DEC2017 17:48:59  28.7S  177.2W mb=5.0  EMSC   KERMADEC ISLANDS REGION      

P: 28NOV2017 112486    28.0S  177.0W 4.0-5.4 BAAAA  No. Kermadec Islands       

 

The earthquake in the Congo of M 5.1 is the second in this region in the past several days. An M 5.3 hit about 250 km north of this on July 30, 2017 but the last event within 200 km of today's epicenter with M>=5.1 was an M 5.1 on February 4, 2016.  Forecast 112530 expected this earthquake within about 100 km of this epicenter was likely around December 2.

 

NEIC reported this earthquake of M 5.1 in DR Congo was felt with intensity II-III in the area(s) of Bukavu, Congo and in Rwanda at Cyangugu, Ruhengeri and Kigali. 

 

O:  2DEC2017 17:20:25   2.7S   28.7E mb=5.1  EMSC   LAC KIVU REGION, CONGO       

P:  2DEC2017 112530     2.0S   29.0E 3.0-4.7 AAAAA  Lake Victoria area          

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the central Andreanof Islands of Alaska. This event follows an activation of the region associated with the last new moon which had maximum tidal stresses near this longitude. It was not felt in this remote area. The last quake within about 100 km of this epicenter with M>=4.2 was an M 4.6 on August 13, 2017. Forecast 112697 had expected today's event was likely around December 3.

 

O:  3DEC2017 04:35:27  52.5N  176.1W mb=4.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  3DEC2017 112697    51.8N  178.0W 3.5-5.3 AABAA  Andreanoff Isls, Aleutians 

 

The most unusual earthquake in the U.S. or Canada today was an M 2.4 in South Carolina. The last earthquake within about 150 km of this epicenter with M>=2.4 was recorded on November 24, 2017 (M 2.4) and prior to that on February 15, 2014 with M 4.1. Forecast 112348 had expected this earthquake in this region was likely at the end of November. This earthquake is located at 100 degrees from the M 6.8 in Samoa of November 4 and may have been promoted by energy from that event.

 

O:  2DEC2017 06:15:07  34.3N   81.2W MD=2.4  EMSC   SOUTH CAROLINA               

O: 02DEC2017 06:15:07  34.3N   81.2W md=2.4  ANSS   Winnsboro Mills South Carolina

P: 28NOV2017 112348    35.0N   82.0W 2.0-4.1 BAAAA  Kentucky/Tennessee/NC      

 

 

 

SECOND QUAKES SHAKES ROCKY MOUNTAINS; CENTRAL CALIFORNIA ACTIVE

 

EARTHQUAKE SUMMARY FOR DECEMBER 1, 2017

 

An M 3.7 earthquake occurred south of the M 4.2 in Colorado yesterday in the region of Socorro, New Mexico. This may be related to the Colorado quake. It was reported by NEIC to have been felt with maximum intensity IV in San Acacia, New Mexico. Lesser shaking was reported from Bosque, Veguita, Socorro, Mountainair, Magdalena, Los Lunas and Caballo, New Mexico. The last earthquake in New Mexico within about 150 km of this epicenter with M>=3.7 occurred on January 4, 1998 nearly 20 years ago. This follows an M 4.6 in central Colorado to the north which occurred yesterday, the largest in that area in 25 years. It is likely that external stresses or regional stresses along the Rocky Mountains helped promote both quakes. The Colorado quake was at 103 degrees from the Iranian quake of November 12 (M 7.2) as reported in the previous summary.  Today's event is at 106 degrees from Iran and could have also been promoted from Iran. Forecast 112365 had expected this earthquake to the southeast was likely around

December 1.

 

O:  1DEC2017 17:12:00  34.3N  106.8W ML=3.7  EMSC   NEW MEXICO                   

P:  1DEC2017 112365    32.6N  104.6W 2.0-3.9 ABBAA  SW U.S.A                    

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 in the Fox Islands, Aleutians, Alaska. This continues the activation of this region which began late in November. The last earthquake of M 4.4 within about 150 km of this epicenter occurred on November 27 with M 4.6, part of a series in the region beginning on November 9, and all of which were M 4.4-4.7. A swarm such as this does not always precede a strong regional event, but does indicate local stress is high.  Forecast 112441 had expected this event within about 100 km of the epicenter was likely at the end of November.

 

O:  2DEC2017 02:28:31  52.1N  170.6W mb=4.4  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 02DEC2017 02:28:32  52.1N  170.5W mb=4.4  ANSS   Yunaska Island Alaska

P: 28NOV2017 112441    52.3N  171.3W 3.5-5.2 BAAAA  Andreanoff Isls, Aleutians 

 

Central California was active today. The strongest event was an M 3.4 south of San Francisco, but two light earthquakes of M 2.6-2.7 were also felt in San Francisco. The M 3.4 is an aftershock of the M 4.6 which hit the region of November 13, 2017. The M 3.4 today is the second largest aftershock of that event - an M 3.8 occurred November 15, 2017. Forecast 112338 expected this earthquake within about 10 km of the epicenter was likely in late November. In previous summaries it had been expected that an activation of southern and central California was likely at this time as:

 

"A moderate earthquake in the region west of Los Angeles and north to San Francisco is considered possible in the next four days. At the least, residents should check their earthquake preparedness kits to see if they are ready for a moderate quake at this time." (November 30-December 1, 2017)

 

NEIC reported the earthquake of M 3.4 in Central California was felt with intensity IV in Chualar, California and II-III in the area(s) of Gonzales, Hollister, Salinas, Carmel Valley, Monterey and Big Sur, California.

 

NEIC reported the earthquake of M 2.6 near Morgan Hill, California  was felt with intensity II-III in the area(s) of Morgan hill and Gilroy and possibly in San Francisco, California.  An earlier quake near Oakland, California of M 2.6 was reported felt with intensity II-III in Oakland, San Leandro, Castro Valley, Alameda, San Lorenzo, Hayward, Moraga, Hayward, Alamo, Union City, San Francisco, Half Moon Bay and Brentwood, California.

 

O:  2DEC2017 02:59:58  35.7N  121.0W MD=2.2  EMSC   CENTRAL CALIFORNIA           

O:  2DEC2017 07:15:18  36.7N  121.3W ML=3.4  EMSC   CENTRAL CALIFORNIA           

P: 27NOV2017 112338    36.7N  121.4W 2.5-4.4 BAAAA  Central California         

 

O:  2DEC2017 04:05:18  37.3N  121.6W MD=2.5  EMSC   NORTHERN CALIFORNIA          

P: 29NOV2017 112338    36.9N  121.7W 2.5-4.6 BAAAA  Central California         

 

O:  1DEC2017 14:26:37  37.7N  122.2W MD=2.6  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 29NOV2017 112340    37.9N  122.0W 2.5-4.8 AAAAA  Central California         

 

MODERATE QUAKE IN DELAWARE MAY INDICATE CALIFORNIA EVENT COMING

 

EARTHQUAKE SUMMARY FOR NOVEMBER 30, 2017

 

A series of unusual and strong earthquakes in the U.S., Iran and Papua New Guinea today occurred within a few hours of each other. In the U.S. this included an M 4.6 in Delaware followed about an hour later by an M 3.6 in Central Colorado. These two are not unfamiliar. In August 23, 2011 a strong quake of M 5.8 hit outside Washington, D.C.. At M 5.4 It was associated with one of the strongest earthquakes in Colorado in recent memory. The juxtaposition of these quakes was noted in this summary at the time as:

 

 

"A moderately strong earthquake of M 5.8 hit Virginia and Washington D.C. today and was felt from New Brunswick, Canada to Florida and as far inland as the central United States. This is the second moderately strong and highly unusual earthquake to hit the North American plate in less than 12 hours, the first being an earthquake in Colorado of M 5.4 earlier in the day. We discussed the Colorado quake in our previous summary." (August 23, 2011)

 

The Delaware earthquake of M 4.1-4.5 was reported felt with maximum intensity V in Clayton, Delaware; Newport New Jersey, and IV in Delaware at Dover, Magnolia, Camden Wyoming, Marydel, in Maryland at Galena, Sudlersville, and in general within about 50 km of the epicenter. It was felt with intensity II-III throughout much of the central eastern coast of the U.S. including in New Jersey, Delaware, Pennsylvania, Virginia, New York, Washington D.C, Connecticut, West Virginia, Massachusetts, Rhode Island, North Carolina, Vermont, Ohio, Kentucky, South Carolina, Illinois, Florida, Mississippi, Missouri, and Maryland, The earthquake in Delaware is one of the strongest recorded in that State. Earthquake in this area are often followed within days by a strong quake in southern or central California, such as occurred in the Northridge quake of M 6.7 on January 17, 1994 (preceded by an M 4.6 in southern Pennsylvania on January 16, 1994) and the Morgan Hill quake of April 24, 1984 preceded by an M 4.4 in Pennsylvania on April 23, 1984.  The events in August 2011 were later found to occur at the time of one of the strongest cosmic ray events known, possibly associated with a gravity wave and other effects which may have triggered this series. A similar relation may be found with today's events, but these areas usually are not announced until extensive data analysis. As this list includes the largest events in the Delaware area in the past 50 years and some of the strongest earthquakes in Central and southern California in the same period, may be significant. This correlation is strongest with moderate starting quakes in the region of Delaware. The area of southern California near Northridge is currently at the 23-year cycles of large quakes in the area. A moderate earthquake in the region west of Los Angeles and north to San Francisco is considered possible in the next four days. At the least, residents should check their earthquake preparedness kits to see if they are ready for a

moderate quake at this time.

 

"The full moon will arrive at 15:47 UT on December 3, 2017. Longitudes under maximum tidal stress center at this time center near 57 West longitude and 123 East longitude. These include in the west, area of the central Atlantic, the western coast of South America, the Caribbean and the eastern coast of the U.S. and Canada and in the east much of the subduction zone of the Pacific and Asian plate including central Indonesia north to Japan. The earthquake in Delaware today may have been promoted by tidal stresses association with the coming full moon. These are areas most likely to see tidal triggering but tidal promotion of seismicity is possible in may other regions, especially in subduction zonea and areas of vertical tectonics where motions are associated with fluid flow." (December 1, 2017)

 

Forecast 112348 had expected an earthquake in the area of Delaware was likely with magnitude up to M 4.1 around December 1. The earthquakes in Delaware and in Iran are near the third node (120 degrees) from the M 7.2 in the Loyalty Islands and may have been promoted from that source.

 

O: 30NOV2017 21:47:29  39.2N   75.4W Mw=4.1  EMSC   DELAWARE                     

O: 30NOV2017 21:47:31  39.2N   75.4W mw=4.1  ANSS   ENE of Dover Delaware

P:  1DEC2017 112348    37.0N   77.0W 2.0-4.1 ACAAA  Kentucky/Tennessee/NC      

 

The earthquake in Colorado was reported felt with intensity II-III in Colorado at Howard, Cotopaxi, Salida, Canon City, Moffat, Westcliffe, Buena Vista, Monte Vista and Denver. This epicenter is at 103 degrees from the M 7.2 in Iran of November 12 and was probably promoted from that source. Strong concentration of seismic energy occurs at this distance from large earthquakes. The earthquake of M 3.6 in Colorado was the strongest within about 100 km of that epicenter since an M 3.6 on June 20, 2002, the only such event in the past 25 years, making it a locally significant earthquake. No earthquakes of M>3.6 have occurred in this area of Colorado in this time period. Forecast 112345 had expected activity near this epicenter around November 30.

 

O: 30NOV2017 22:17:29  38.4N  105.8W ML=3.6  EMSC   COLORADO                     

P: 30NOV2017 112345    36.9N  105.1W 2.0-4.1 ABAAA  Colorado area              

 

Several hours after the Delaware event an M 4.9 occurred near the antipode in the Southeast Indian Ridge. It is unlikely that the Delaware earthquake triggered this event in the Indian Ocean but it is possible they were triggered by an external stress, as yet unknown.

 

O:  1DEC2017 02:29:59  48.8S  106.9E mb=4.9  EMSC   SOUTHEAST INDIAN RIDGE       

 

A strong earthquake in the Kerman area of Iran today of M 6.0 was widely felt. The mainshock was reported felt with intensity V in Kerman; IV in Bahramabad, and II-III in Yazd, Dosab and Aspanada, Iran. Aftershocks were felt in Kerman and Bahramabad, Kerman with intensity II-IV. The last earthquake of M>=6 within about 200 km of this epicenter was an M 6.4 on February 22, 2005 more than 12 years ago. The only other such earthquake in this area in the past 25 years was an M 6.6 on March 14, 1998.  Forecast 112384 had expected this earthquake within about 50 km in Iran was likely at the end of November. This may be a regional aftershock  of the M 7.2 in Iran of November 12 far to the southwest.

 

O:  1DEC2017 02:49:03  30.7N   57.3E ML=4.0  EMSC   EASTERN IRAN                 

O:  1DEC2017 02:57:47  30.7N   57.4E ML=4.2  EMSC   EASTERN IRAN                 

O:  1DEC2017 02:32:45  30.7N   57.4E Mw=6.0  EMSC   EASTERN IRAN                  

O:  1DEC2017 02:43:26  30.7N   57.4E mb=5.0  EMSC   EASTERN IRAN                 

O:  1DEC2017 03:35:00  30.7N   57.4E mb=5.1  EMSC   EASTERN IRAN                 

P: 23NOV2017 112384    31.0N   57.0E 3.8-5.4 CAAAA  So. Iran                    

 

A strong earthquake of M 6.0 also was felt in the region of Papua New Guinea. NEIC reported it was felt with maximum intensity IV at Lae, Morobe, and II-III in Kainantu, Eastern Highlands and in Port Moresby. The last earthquake with M>=6.0 in Eastern New Guinea within about 200 km of this epicenter occurred on October 17, 2016 (M 6.9) and prior to that as an M 6.6 on November 7, 2014. This epicenter is near the antipode of the M 6.5 in the Central Mid-Atlantic two days ago and may have been promoted from that quake.  Forecast 112275 had expected today's event within about 100 km of this epicenter likely at the end of November. This epicenter is at 103 degrees from the M 7.2 in Iran of November 12 and was probably promoted from that source. Strong concentration of seismic energy occurs at this distance from large earthquakes.

 

O:  1DEC2017 02:50:01   6.1S  147.6E Mw=6.0  EMSC   EASTERN NEW GUINEA REG., P.N.G

P: 25NOV2017 112275     7.0S  148.0E 4.0-5.6 CAAAA  New Ireland                

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the area of Southern Alaska continuing moderate quakes of recent days in that area. The last earthquake within about 100 km of this epicenter with M>=4.2 occurred on November 5, 2017 (M 5.0-5.1) and today's event is probably an aftershocks of that November shock. Forecast 112456 had expected this event within about 50 km was likely at the end of November.

 

NEIC reported this earthquake of M 4.2 in Southern Alaska was felt with intensity II-III in the area(s) of Clam Gulch, Ninilchik, Anchor Point, Kasilof, Homer, Kenai, Anchorage, Eagle River, and Chugiak, Alaska.

 

O:  1DEC2017 02:47:40  60.3N  152.7W ML=4.2  EMSC   SOUTHERN ALASKA              

P: 24NOV2017 112456    60.5N  151.5W 3.2-5.1 CAAAA  Central Alaska             

 

 

M

STRONG EARTHQUAKE ON CENTRAL MID-ATLANTIC RIDGE

 

EARTHQUAKE SUMMARY FOR NOVEMBER 29, 2017

 

The strongest earthquake in the world today was an M 6.5 near the geomagnetic equator in the Central Mid-Atlantic region. This is near the antipodal region of the Loyalty Islands where major earthquakes have recently occurred. This is a remote area and this earthquake was not reported felt. No tsunami is expected. The last earthquake of M>=6.5 within about 400 km of this epicenter was an M 6.5 near this same epicenter nearly 10 years ago on April 24, 2008. The last of larger magnitude was an M 6.8 on January 12, 2005 about 200 km to the east. The largest event in this area in the past 25 years was an M 7.0 on March 14, 1994. Forecast 112001 had expected this event within about 50 km of this epicenter was likely towards the end of November. This event was preceded by two moderate quakes on the Southern Mid-Atlantic Ridge of M 4.9-5.0 yesterday. This epicenter is at 146 degrees from the M 6.8 in Samoa of November 4, a distance at which strong triggering is likely.

 

O: 30NOV2017 06:32:50   1.1S   23.4W Mw=6.5  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P: 21NOV2017 112001     1.0S   24.0W 4.0-5.4 CAAAA  Central Mid-Atlantic       

 

O: 29NOV2017 03:36:15  25.9S   13.9W mb=5.0  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

 

A strong M 5.7 near the geomagnetic equator in southern Peru also occurred today. NEIC reported maximum intensity V in Pisco, Ica, Peru; IV in Vista Alegre and II-III in Ica, Chincha Alta and Lima, Peru. This event occurred near local solar midnight and may have been promoted by strong tidal stresses. The last earthquake within about 200 km of this epicenter with M>=5.7 occurred as an M 6.1 on March 15, 2014.   Forecast 112468 had expected today's epicenter would be activity within about  50 km around November 30. This epicenter is at 106 degrees from the M 7.2 in the Loyalty Islands, a distance at which strong

triggering is likely.

 

O: 29NOV2017 06:29:06  14.4S   76.2W Mw=5.7  EMSC   NEAR COAST OF CENTRAL PERU   

O: 29NOV2017 14:28:16  14.6S   76.3W ML=4.5  EMSC   NEAR COAST OF CENTRAL PERU   

P: 30NOV2017 112468    15.0S   76.0W 4.0-5.5 AAAAA  Central Peru               

 

On the other side of the world an M 5.5 in Papua New Guinea also hit near the geomagnetic equator. The last earthquake within about 200 km of this epicenter with M>=5.5 This is probably an aftershock of the M 6.5 of November 7, 2017. The only other such earthquake in the area in the past 1.5 years was an M 5.9 on June 2, 2017. Forecast 112279 had expected today's earthquake within about 50 km of this epicenter was likely around November 27.

 

O: 30NOV2017 05:50:21   4.4S  143.8E Mw=5.5  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

P: 27NOV2017 112279     5.0S  144.0E 4.0-5.4 BAAAA  Papua New Guinea            

 

An earthquake in the Banda Sea also occurred in the Banda Sea, Indonesia today. This event is also near the geomagnetic equator suggesting strong promotion by tidal effects five days after the last major geomagnetic storm.  BMG reported this event of M 5.7 was felt with intensity III in Saumlaki and II in Jailolo, Banda Sea, Indonesia. NEIC reported this earthquake of M 5.5 in the Banda Sea was felt with intensity II-III in the area(s) of Darwin, Northern Territory, Australia. No damage was reported. The last earthquake within about 200 km of this epicenter with M 5.5-5.7 occurred on August 18, 2017 also with M 5.5. The last of M>5.7 was an M 5.8 nearly two years ago on December 24, 2015. Forecast 112287 had expected this event within about 25 km of this epicenter around November 28.

 

O: 29NOV2017 23:53:34   6.3S  130.0E Mw=5.5  EMSC   BANDA SEA                    

O: 29NOV2017 23:53:50  06.9S  129.9E MS=5.7  BMG  Felt with intensity III

P: 28NOV2017 112287     7.0S  130.0E 4.0-5.4 AAAAA  West Irian, PNG            

 

The strongest earthquake in the U.S. or Canada today occurred in the Andreanof Islands, Alaska with M 4.2. This is part of a migration to the west of seismicity which has been active in the Fox Islands over the past several days. The area was expected to see an activation associated with strong tidal stresses of the last new moon. Forecast 112441 had expected an event in this portion of the Andreanof Islands was likely around November 30. The last moderate earthquake in this area was an M 4.4 on November 16, 2017 and prior to that an M 4.1 on September 11, 2017.

 

 

O: 29NOV2017 18:00:10  50.8N  173.2W ML=3.5  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O: 29NOV2017 18:00:05  50.7N  173.1W ML=4.2  ANSS   ANDREANOF ISLANDS, ALEUTIAN IS

P: 30NOV2017 112441    52.1N  172.8W 3.5-4.9 ABAAA  Andreanoff Isls, Aleutians 

 

Another moderate earthquake also occurred today in the area of Wellington, New Zealand. GEONET reported this earthquake was felt with light intensity northeast of Whanganui 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 1166 people reported feeling this earthquake with 570 reports of weak intensity; 532 of light intensity; 58 with moderate intensity; 5 with strong intensity; and 1 of severe intensity. NEIC reported this earthquake of M 4.7 in North Island, New Zealand was felt with intensity II-III in the area(s) of Wanganui, Manawatu-Wanganui, New Zealand.  This area has been active over the past week with three moderate felt earthquakes. These appear to have been promoted by the strong tidal stresses associated with the previous new moon as noted in previous summaries:

 

"The new moon will arrive at 11:42 UT on November 18. Areas which are sub-solar at this time are near 5 degrees east longitude while those which area anti-solar are near 175 degrees west longitude. These include the Samoa/Tonga/Fiji/New Zealand areas and the Aleutians near the IDL" (November 16-24, 2017)

 

The M 4.8 today occurred within about an hour of local solar noon and was probably promoted by high tidal stresses which maximize at that hour. Similar quakes occurred on November 26 (M 4.5); November 23 (M 4.2) and November 21 (M 4.6). Forecast 112501 had expected today's event was likely around November 29.

This epicenter is at 101 degrees from the M 8.2 in Chiapas, Mexico, a distance at which strong triggering is likely.

 

O: 29NOV2017 23:33:37  39.9S  174.8E mb=4.7  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 29NOV2017 23:33:39  39.9S  174.9E MS=4.8  GEONET Felt with light intensity

P: 29NOV2017 112501    40.0S  174.0E 3.0-4.4 AAAAA  North Island, N.Z.         

 

A light earthquake west of Los Angeles, California occurred today with M 3.1 and was widely felt in the area.  NEIC reported this earthquake of M 3.1 in Southern California was felt with intensity II-III in the area(s) of Lebec, Frazier Park, Santa Clarita and Santa Ana, California.  The last earthquake of M>=3.1 to shake the region within about 50 km of this epicenter occurred on September 15, 2017 (M 3.2. Since March, 2016 four such earthquakes have occurred in this region, the largest was an M 3.5 on May 30, 2017. Forecast 112376 expected this event within about 50 km around November 29. It may have also been promoted by tidal stresses as it occurred within about an hour of local solar noon.

 

O: 29NOV2017 20:41:32  34.9N  118.9W ML=3.1  EMSC   CENTRAL CALIFORNIA           

P: 29NOV2017 112376    34.3N  118.5W 2.5-4.4 AAAAA  So. California             

 

ORE MODERATELY STRONG SEISMICITY AT HIGH LATITUDES

 

EARTHQUAKE SUMMARY FOR NOVEMBER 28, 2017

 

A moderately strong earthquake of M 5.4-5.6 in the Norwegian Sea occurred today. It occurred in a remote area north of Norway and was not reported felt. The event occurred at 3 East longitude, close to the longitude of maximum tidal stress as identified in earlier issues of this summary as:

 

"The new moon will arrive at 11:42 UT on November 18. Areas which are sub-solar at this time are near 5 degrees east longitude while those which area anti-solar are near 175 degrees west longitude. These include the Samoa/Tonga/Fiji/New Zealand areas and the Aleutians near the IDL" (November 16-24, 2017)

 

This follows an M 5.3 near Anchorage, Alaska yesterday, also at a high latitude. The earthquake in the Norwegian Sea is the strongest within about 200 km of that epicenter since an M 6.2 on May 24, 2012 and prior to that an M 6.0 on August 20, 2009. Forecast 112466 had expected this event within about 100 km of the epicenter was likely at the end of November.

 

O: 28NOV2017 13:15:44  72.8N    3.1E mb=5.4  EMSC   NORWEGIAN SEA                

O: 28NOV2017 13:15:45  72.6N    3.3E mw=5.6  ANSS   Norwegian Sea"

P: 22NOV2017 112466    72.0N    0.0E 3.0-4.4 CAAAA  Norway                      

 

The strongest earthquake in the U.S. or Canada today was an M 4.3 in the Rat Islands, also near the longitude of highest tidal stress at the last new moon. The Rat Islands has been relatively quiet in recent weeks. The last event of

M>=4.3 in the area was an M 4.3 a month ago on October 29, 2017, the only such event since an M 6.6 in the Rat Islands on October 8, 2017. Forecast 112450 expected this activity in the Rat Islands was likely at the end of November.

 

O: 28NOV2017 17:47:50  51.5N  178.2E mb=4.3  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 23NOV2017 112450    52.0N  174.0E 4.0-5.8 BACAA  Rat Islands                

 

UNUSUAL, MODERATE EARTHQUAKE SHAKES AREA NEAR VALDEZ, ALASKA

 

EARTHQUAKE SUMMARY FOR NOVEMBER 27, 2017

 

The strongest earthquake of the day occurred in southern Alaska near Valdez. NEIC reported maximum intensity IV in Valdez, Girdwood, and Willow with intensity II-III reported from as far as 500 km at Fairbanks, Alaska. It was also reported felt in Homer, Talkeetna, Soldotna, Seward, Anchorage, Moos Pass, Indian, Eagle River, Palmer, Cooper Landing, Chugiak, Fort Richardson, Elmendorf AFB, Wasilla, Kenai, Glennallen, Alaska. No damage or tsunami were reported with this earthquake. This is the strongest earthquake in southern Alaska within about 200 km of this epicenter during 2017. The last event of M>=5.3 in this area was an M 5.4 seven years ago on September 25, 2010 and prior to that an M 5.3 on August 25, 2004. While eight earthquakes of M 5.3-5.4 have occurred in this area in the past 25 years, the largest has only reached M 5.5 - on March 1, 2000.  Forecast 112457 expected this earthquake within about 25 km of the epicenter was likely around November 24. This earthquake occurred within about half an hour of local solar noon and was probably promoted by tidal stresses which maximize at this hour. It is near the longitude of maximum tidal stress associated with the previous new moon. It may also have been promoted by stresses associated with the last geomagnetic storm as noted in previous issues:

 

"... conclude the latest geomagnetic storm, the strongest since November 7, 2017. It may set off a new round of geomagnetic promotion of seismicity most likely around November 27 at geomagnetic equatorial zones and possibly at high latitudes if this storm should linger and intensify. Northern lights were visible with this storm as far south as northern U.S." (November 24-27, 2017)

 

and

 

"The new moon will arrive at 11:42 UT on November 18. Areas which are sub-solar at this time are near 5 degrees east longitude while those which area anti-solar are near 175 degrees west longitude. These include the Samoa/Tonga/Fiji/New Zealand areas and the Aleutians near the IDL" (November 16-24, 2017)

 

As the epicenter is at 90 degrees (node 4) from the M 7.0 and 6.7 in the Loyalty

Islands of the past month and at 60 degrees (node 6) from the great Chiapas, Mexico quake of September 8, 2017 (M 8.2) it is also likely that this event was promoted by seismic energy from those events.

 

O: 27NOV2017 22:18:30  60.6N  147.4W ML=5.3  EMSC   SOUTHERN ALASKA              

P: 24NOV2017 112457    60.9N  147.4W 3.2-5.1 BAAAA  Central Alaska             

 

A moderate earthquake of M 4.8-5.0 in the region of the northeastern Caribbean was widely felt today. NEIC reported it was felt with intensity II-III in Guadeloupe at Marigot,  and Pointe-Noire and in Saint Martin; in the Netherlands Antilles in Sint Maarten at Little Bay, Cul De Sac, Simpson Bay; in Antigua and Barbuda at Saint John's; in Saint Kitts and Nevis at Monkey Hill, Boyds, and Cotton Ground. While this earthquake was widely felt no reports of damage or casualties were found. The last earthquake of M>=5 within about 150 km of this epicenter occurred on April 19, 2014 with M 5.0. The last of larger magnitude was an M 5.4 on December 21, 2002. Most moderate earthquakes, including an M 6.0 on May 16, 2014, occurred about 100-150 km south of today's epicenter in the Leeward Islands.   Forecast 112315 had expected a moderate earthquake in this area around November 30. This epicenter is at the third node (120 degrees) from the Iran quake of M 7.2 of November 12 and may have been promoted from that source.

 

O: 28NOV2017 00:12:41  18.4N   61.9W mb=5.0  EMSC   ANTIGUA AND BARBUDA REGION   

P: 30NOV2017 112315    20.0N   63.0W 3.0-4.7 ABAAA  Bahamas/No. Caribbean      

 

STRONG QUAKE RATTLES NEW IRELAND P.N.G.

 

EARTHQUAKE SUMMARY FOR NOVEMBER 26, 2017

 

A strong earthquake of M 6.0 shook the region of New Ireland, Papua New Guinea near Taron today. NEIC reported it was felt with intensity II-III in New Ireland at Namatanai, Papua New Guinea and in the northern Solomons at Panguna, PNG. No damage or tsunami was reported with this earthquake. The only other earthquake this year with M>=6 in the New Ireland area was an M 6.4 about 25 km south of this epicenter on July 13, 2017. Today's event may be an aftershock of that earthquake. Forecast 112274 had expected this event within about 100 km of the epicenter was likely around November 23. This epicenter lies in the southwest Pacific where a series of moderate to large quakes have occurred over the past month. It is close to the longitude at which tidal stresses were maximized with the last new moon as noted previously in this summary and may have been promoted by tidal stresses.

 

 

"The new moon will arrive at 11:42 UT on November 18. Areas which are sub-solar at this time are near 5 degrees east longitude while those which area anti-solar are near 175 degrees west longitude. These include the Samoa/Tonga/Fiji/New Zealand areas and the Aleutians near the IDL and much of Europe. These regions are most likely to see tidal promotion of seismicity in the next week. Tidal stresses can help trigger seismicity in many areas, however and are not limited to these longitude zones." (November 16-19, 2017)

 

It is also within about 10 degrees of the geomagnetic equator and may have been promoted by geomagnetic effects as noted in previous issues of this summary:

 

"The geomagnetic field was at quiet conditions today.  The AP level was 3. High latitude geomagnetic field also saw quiet conditions with AP at 1. This appears to conclude the latest geomagnetic storm, the strongest since November 7, 2017. It may set off a new round of geomagnetic promotion of seismicity most likely around November 27 at geomagnetic equatorial zones and possibly at high latitudes." (November 24-26, 2017)

 

The epicenter is located at 106 degrees from the M 7.2 in Iran of November 11, a distance at which concentrated seismic energy from that event could promote far-field seismicity.

 

 

O: 27NOV2017 07:11:14   4.6S  153.2E Mw=6.0  EMSC   NEW IRELAND REGION, P.N.G.   

O: 27NOV2017 07:11:12   4.6S  153.2E mw=6.0  ANSS   Taron Papua New Guinea

P: 23NOV2017 112274     5.0S  154.0E 4.0-5.4 BAAAA  New Britain                

 

The activation of eastern and central Europe which began with the new moon of November 18 continued today with an M 4.6 in Bulgaria. NEIC reported this event was felt with intensity II-III in Bulgaria at Zlatica, Pravec, Brezovo, Jambol and Sumen. The only other event of M>=4.2 in Bulgaria during 2017 was an M 4.2 on January 3, 2017. The last earthquake in the region of Bulgaria with M>4.2 was an M 5.6 on May 22, 2012. Forecast 112429 had expected today's activity within about 150 km of this epicenter was likely at the end of November. This epicenter is at 144 degrees from the M 7.1 quake and associated shocks in the Loyalty Island. This is a distance at which seismic energy concentrates at the surface following large earthquake and can help promote additional seismicity.

 

O: 26NOV2017 19:01:31  42.7N   24.4E ML=4.2  EMSC   BULGARIA                     

O: 26NOV2017 19:01:32  42.7N   24.3E mb=4.6  ANSS   SSE of Anton Bulgaria

P: 30NOV2017 112429    43.0N   22.0E 3.0-5.2 BABAA  Romania/NW Turkey          

 

Seismicity in New Zealand also continued active today following several days of activity north of North Island which was lightly felt in the Bay of Plenty area. GEONET reported today's earthquake of M 4.5 near Wellington was felt with light intensity 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 2138 people reported feeling this earthquake with 720 reports of weak intensity; 1138 of light intensity; 255 with moderate; and 12 with strong; 1 with severe and 12 with extreme intensity.

NEIC reported this earthquake of M 4.3 in New Zealand was felt with intensity II-III in the area(s) of Wellington at Wellington, Lower Hutt and Picton, New Zealand.  The last earthquake in the Cook Strait with M>4.5 was an M 5.0 on September 20, 2017. The region was also active early in 2017 with the strongest event of the year an M 5.2 on January 5, 2017. Forecast 112503 expected today's event was likely within about 50 km of this epicenter around November 23.

 

O: 26NOV2017 13:31:35  41.2S  174.7E mb=4.3  EMSC   COOK STRAIT, NEW ZEALAND     

O: 26NOV2017 13:31:35  41.1S  174.6E MS=4.5  GEONET Felt with light intensity

P: 23NOV2017 112503    41.0S  175.0E 3.0-4.9 BAAAA  So. Island, N.Z.            

 

The strongest seismicity in the U.S. or Canada again today was in the Fox Islands Aleutians, Alaska. An M 4.6 today followed a similar M 4.9 at the same epicenter which occurred yesterday. Neither of these events was reported felt in this remote area. Forecast 112441 had expected this activity within about 50 km was likely around November 28.

 

O: 26NOV2017 06:07:25  52.0N  170.5W mb=4.9  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 27NOV2017 03:33:48  52.1N  170.5W mb=4.6  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 28NOV2017 112441    52.3N  171.3W 3.5-5.2 AAAAA  Andreanoff Isls, Aleutians 

 

UNUSUAL EARTHQUAKE IN SOUTHERN VANUATU ASSOCIATED WITH LOYALTY ISLANDS SEQUENCE

 

EARTHQUAKE SUMMARY FOR NOVEMBER 25, 2017

 

The strongest earthquake of the day was an M 5.7 in the region of Southern Vanuatu bordering the Loyalty Islands. This event is about 250 km northeast of the current swarm of large earthquakes in the Loyalty Islands, and, while not part of that swarm was probably promoted by stress redistribution from those earthquakes.  This is located in a remote area and the earthquake was not reported felt, nor was a tsunami generated by it. The last event within about 200 km of this  epicenter with M>=5.7 occurred on March 24, 2013 with M 6.0-6.1.

Forecast 112218 expected this earthquake about 150 km southeast of this epicenter was likely around November 18.

 

O: 25NOV2017 17:30:07  20.7S  172.4E Mw=5.7  EMSC   VANUATU REGION               

P: 18NOV2017 112218    22.0S  172.0E 4.0-5.4 CBAAA  Loyalty Islands            

 

An eruption of Sinabung Volcano on Sumatra at 3.1N 98.3E continued today. Other minor volcanic eruptions today continued in Fuego, Guatemala, Popocatepetl, Mexico, Dukono at 1.6N 128E in Halmahera, Indonesia and Sabancaya, Southern Peru. None of these are major eruptions. Many of these eruptions appear related to the new completed geomagnetic storm three days ago.

 

The strongest seismicity in the U.S. or Canada today continued in the Fox Islands area of the Aleutians, Alaska. This event of M 4.7 in the western Fox Islands was not reported felt in this remote area. The last earthquake of M>=4.7 within about 150 km of this epicenter occurred on November 9, 11 and 15 with M 4.7-4.9. The last of significantly larger magnitude was an M 5.3 on August 9, 2017 - the largest event in the area during 2017.  Forecast 112441 had expected today's event was likely around November 28 within  about 50 km of this epicenter. 

 

O: 26NOV2017 06:07:22  52.0N  170.6W mb=4.7  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 26NOV2017 06:07:26  52.0N  170.6W mb=4.7  ANSS   Amukta Island Alaska

P: 28NOV2017 112441    52.3N  171.3W 3.5-5.2 AAAAA  Andreanoff Isls, Aleutians 

 

ELEVATED SEISMICITY CONTINUES IN GREECE; TURKEY

 

EARTHQUAKE SUMMARY FOR NOVEMBER 24, 2017

 

Moderate seismicity continued today in the regions of Greece and Turkey. This included an M 5.1 in Turkey and an M 4.6 in Greece. NEIC reported the event in  Turkey was felt with maximum intensity IV in Marmaris, and III in Ula, Mugla, Turkey. The M 4.6 in Greece was felt with intensity II in Kalamata, Messinia, Greece. The earthquake in Greece was the strongest within about 150 km of that epicenter since an M 4.9 on April 27, 2017 and prior to that a similar M 4.9 of December 27, 2016. Forecast 112068 had expected this event was likely around November 20.

 

O: 24NOV2017 18:51:40  36.9N   21.4E mb=4.6  EMSC   SOUTHERN GREECE              

P: 20NOV2017 112068    36.0N   23.0E 3.0-4.8 BAAAA  Aegean Sea                 

 

The M 5.1 in western Turkey continued the activation of that region which accompanied the new moon of November 18. It appears to be the strongest aftershock of the M 6.6 which hit the region on July 20, 2017 since an M 5.3 on August 8, 2017. Forecasts 112332 and 112390 had expected this event within about 150 km of this epicenter around November 22-28. This earthquake is located at 142-144 degrees from M 7.0 in the Loyalty Islands of November 18. Seismic energy concentrates at this distance from large quakes and can help to promote additions earthquakes.

 

O: 24NOV2017 21:49:15  37.1N   28.6E mb=5.1  EMSC   WESTERN TURKEY               

P: 22NOV2017 112332    37.0N   27.0E 3.0-4.4 AAAAA  Aegean Sea                  

P: 28NOV2017 112390    37.0N   29.0E 3.5-5.0 BAAAA  Turkey                     

 

A series of three moderate M 4.8 earthquakes occurred in the area north of North Island, New Zealand today. Most occurred far enough from land that they were unfelt. But the event of 05:24 was lightly felt in North Island.  GEONET reported it was felt with light intensity in the area of northern North Island,  New Zealand. 126 persons reported feeling this event, 90 with weak and 36 with light intensity.  Forecasts 112496 and 112497 had expected this activity in late November. These earthquakes are located at 142-144 degrees from M 7.2 in Iran of November 12. Seismic energy concentrates at this distance from large quakes and can help to promote additions earthquakes.

 

O: 24NOV2017 14:11:33  35.5S  178.8E mb=4.8  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 29NOV2017 112497    37.0S  177.0E 3.0-4.6 BBBAA  North Island, N.Z.         

 

O: 24NOV2017 09:48:31  36.0S  179.8E ML=4.8  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 22NOV2017 112496    37.0S  179.0W 3.5-5.0 AAAAA  E. of North Islands N.Z.   

 

O: 25NOV2017 05:24:05  37.9S  178.1E mb=4.8  EMSC   OFF E. COAST OF N. ISLAND, N.Z

O: 25NOV2017 05:24:05  37.8S  178.2E ML=4.8  GEONET Felt with light intensity

P: 29NOV2017 112497    37.0S  177.0E 3.0-4.6 BAAAA  North Island, N.Z.         

 

The largest earthquake in or near the U.S. or Canada today was an M 4.7 off the coast of Oregon. NEIC reported it was felt with intensity I-III in Oregon at Yachats, Turner, Sherwood, Portland, Tygh Valley, and possibly in communities in northern California. No damage was reported. This is the strongest earthquake in the area off the cost of Oregon within about 200 km of this epicenter since an M 5.5 a year ago on November 28, 2016. Forecast 112423 had expected this event within about 50 km was likely around November 28. This earthquake is located at 102 degrees from the M 7.2 in Iran of November 12. Seismic energy concentrated at the surface at this distance from large earthquakes and can help promote zonal seismicity.

 

O: 24NOV2017 17:36:12  43.1N  126.3W Mw=4.7  EMSC   OFF COAST OF OREGON          

P: 28NOV2017 112423    42.5N  126.8W 3.0-4.4 BAAAA  Off Coast of Oregon        

 

RYUKYU ISLANDS, JAPAN,  SHAKE

 

EARTHQUAKE SUMMARY FOR NOVEMBER 23, 2017

 

The strongest earthquake of the day was an M 5.5 in the Ryukyu Islands of Japan. NEIC reported it was felt with intensity II in Okinawa and Chatan, Ryukyu Islands. No damage was reported with this earthquake. The last earthquake in this area of the Ryukyu Islands with M>=5.5 occurred as an M 6.0 on July 26, 2017. Forecast 112322 expected this event in the area around November 22.

 

O: 23NOV2017 18:02:35  27.2N  130.4E Mw=5.5  EMSC   RYUKYU ISLANDS, JAPAN        

P: 22NOV2017 112322    29.0N  131.0E 4.0-5.4 BAAAA  Kyushu Japan               

 

An unusual earthquake in eastern China of M 5.1 today was felt in China at Fuling, Chongqing with intensity IV. The last earthquake within about 200 km of this epicenter in China occurred more than 25 years ago. Forecast 112325 had expected activity in this region of China in late November.

 

O: 23NOV2017 09:43:35  29.4N  108.2E mb=5.1  EMSC   CHONGQING-HUBEI BORDER RG, CHI

P: 30NOV2017 112325    28.0N  104.0E 4.0-5.4 CBCAA  Myanmar                    

 

Seismicity in the U.S. or Canada was quiet today. The strongest event in this region was an M 3.4 in Baja California, Mexico. It was not reported felt. Forecast 112368 had expected a light to moderate event in this area was possible around November 22.

 

O: 23NOV2017 11:53:48  31.4N  115.7W ML=3.4  EMSC   BAJA CALIFORNIA, MEXICO      

P: 22NOV2017 112368    32.4N  115.8W 2.5-4.4 AAAAA  So. California             

 

The strongest earthquakes near the U.S. today occurred in Durango, northern Mexico. They were probably felt in the epicentral area but this has not been reported. Forecast 112319 had expected activity in this region around November 22. The last earthquake of M>=4.5 within about 100 km of this epicenter occurred on September 5, 2011 with M 4.8 and prior to that on July 12, 2009 (M 5.1).

 

O: 23NOV2017 18:18:17  25.6N  105.3W ML=4.4  EMSC   DURANGO, MEXICO              

O: 23NOV2017 18:18:17  25.5N  105.2W ML=4.4  UNAM  l NORESTE de SGO PAPASQUIARO, DGO

O: 23NOV2017 18:01:19  25.5N  105.2W ML=4.5  UNAM  l NORESTE de SGO PAPASQUIARO, DGO

O: 23NOV2017 18:01:19  25.6N  105.3W ML=4.5  EMSC   DURANGO, MEXICO              

P: 22NOV2017 112319    24.0N  109.0W 3.5-4.9 ABCAA  Gulf of California          

 

Two light earthquakes also occurred today in the southeastern U.S. These events of M 2.4 in South Carolina and M 2.5 in Eastern Kentucky were not reported felt but were probably lightly felt in these areas. Forecasts 112109 and 112348 expected the activity in South Carolina in late November while forecast 112081 had expected the event in Kentucky in mid-November.

 

The last earthquake within about 100 km of the South Carolina epicenter with M>=2.4 occurred on July 29, 2012 with M 2.9.

 

O: 24NOV2017 05:57:17  34.7N   80.5W MD=2.4  EMSC   SOUTH CAROLINA               

O: 24NOV2017 05:57:17  34.7N   80.4W md=2.4  ANSS   Pageland South Carolina

P: 19NOV2017 112109    33.0N   80.0W 2.0-4.1 BBAAA  Southeast U.S.             

P: 28NOV2017 112348    35.0N   82.0W 2.0-4.1 BABAA  Kentucky/Tennessee/NC      

 

The last earthquake of M>=2.5 within about 100 km of the Kentucky event occurred on June 20, 2017 with M 2.6 and prior to that an M 2.5 on December 22, 2015.

 

O: 24NOV2017 01:40:14  37.9N   84.7W MD=2.5  EMSC   EASTERN KENTUCKY             

O: 24NOV2017 01:40:14  37.9N   84.7W md=2.5  ANSS   W of Wilmore Kentucky

P: 16NOV2017 112081    37.0N   83.0W 2.0-3.9 CABAA  Kentucky/Tennessee/NC      

 

 

TURKEY AND GREECE ACTIVE FOLLOWING NEW MOON

 

EARTHQUAKE SUMMARY FOR NOVEMBER 22, 2017

 

Two earthquakes in the area of Europe and the mid-east were felt today with moderate intensity. These occurred in Turkey with M 5.0 and in northern Greece with M 4.4. They appear to be part of the activation associated with the new moon of November 18 as previously noted in this summary:

 

"The new moon will arrive at 11:42 UT on November 18. Areas which are sub-solar at this time are near 5 degrees east longitude while those which area anti-solar are near 175 degrees west longitude. These include the Samoa/Tonga/Fiji/New Zealand areas and the Aleutians near the IDL and much of Europe. These regions are most likely to see tidal promotion of seismicity in the next week. Tidal stresses can help trigger seismicity in many areas, however and are not limited to these longitude zones." (November 16-20, 2017)

 

A moderate earthquake of M 5.0 today in southwestern Turkey was reported by NEIC to have been felt with intensity II in Milas, Mugla, Turkey. The last earthquake of M>=5.0 within about 150 km of this epicenter was an M 5.3 on August 8, 2017. Both appear to be regional aftershocks of an M 6.6 in the Dodecanese Islands of July 20, 2017. Forecasts 112332 and 112390 had expected activity in this area towards the end of November. This earthquake is located at 143 degrees from the Loyalty Islands earthquake of November 18 and October 31. Seismic energy concentrates at this distance on the surface after strong events and can help promote further seismicity. This event occurred near local solar midnight suggesting promotion from the geomagnetic storm and tidal stresses which maximize at this time.

 

 

O: 22NOV2017 20:22:52  37.1N   28.6E Mw=5.0  EMSC   WESTERN TURKEY               

P: 22NOV2017 112332    37.0N   27.0E 3.0-4.4 AAAAA  Aegean Sea                 

P: 28NOV2017 112390    37.0N   29.0E 3.5-5.0 CAAAA  Turkey                     

 

The earthquake of M 4.4 in northern Greece was also felt with moderate intensity. NEIC reported this earthquake of M 4.4 in Northern Greece was felt with intensity II-III in the area(s) of Thessaloniki at Khalastra, Kalokhorion, Ayia Trias, Menemeni, Kalamaria, Stauropolis, Thessaloniki, Triandria, Pilaia. It was also felt in Greece at Kozani, in Pella at Edessa and Katerini, at Ayios Paulos, and in Veroia, Imathia, Greece. The last earthquake within about 150 km of this epicenter in Greece with M>=4.4 occurred on October 14, 2017 with M 4.4-4.5. The last of significantly larger magnitude was an M 4.7 a year ago on November 18, 2016. Forecast 112354 had expected this event was likely in this area around November 24. This earthquake is also located at 146 degrees from the Loyalty Islands earthquake of November 18 and October 31. Seismic energy concentrates at this distance on the surface after strong events and can help promote further seismicity. This earthquake occurred within 10 minutes of local solar midnight and was probably promoted by tidal stresses which maximize at this hour.

 

 

O: 22NOV2017 22:37:34  40.5N   22.5E mb=4.4  EMSC   GREECE                       

P: 24NOV2017 112354    39.0N   22.0E 3.0-4.6 ABAAA  No. Greece                 

 

The largest earthquake in the U.S. or Canada today was an M 4.3 in the Fox Islands, Alaska. This event was reported felt in Unalaska, Alaska with intensity II. It is likely that it was promoted by tidal stresses which maximized near this longitude in the last new moon. An earthquake of M 4.4 hit about 200 km west of this on November 22 in the Fox Islands. The last quake with M>=4.3 within 150 km was an event of M 4.6 on November 3, 2017 and prior to that an M 4.7 on August 10, 2017.  Forecast 112444 had expected today's earthquake within about 25 km of the epicenter was likely around November 23.

 

O: 22NOV2017 17:38:20  53.8N  165.6W mb=4.3  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 23NOV2017 112444    53.7N  165.3W 3.5-5.2 AAAAA  Fox Islands, Aleutians     

 

The largest earthquake reported in the world today was an M 5.1-5.5 in western

Taiwan.  CWB reported this earthquake was felt with intensity V in Chiayi, Yunlin; IV in Changhua, Nantou, Taichung, Tainan; III in Kaohsiung, Hualien, Penghu; II in Taitung, Miaoli, Tainan, Pingtung, Yilan, Hsinchu and I in Taipei and Taoyuan Counties, Taiwan. The aftershock of M 4.0 was felt with intensity III in Yunlin and Chiayi; II in Nantou, Changhua, and I in Taichung, Kaohsiung, Taitung and Tainan Counties. NEIC reported this earthquake of M 5.1 in Taiwan was felt with maximum intensity IV in Chiayi, Nantou, Tainan, Taichung, Pingtung and II-III throughout most of the remainder of Taiwan. It was also reported felt with intensity II in Fuzhou, Fujian, mainland China. The last earthquake of M>=5.5 within about 200 km of this epicenter in Taiwan occurred on October 6, 2016 with M 5.8 and prior to that as an M 6.4 on February 5, 2016. Forecast 112329 had expected this event within about 50 km of the epicenter was likely around November 24. The mainshock occurred within about an hour of local solar midnight and may have been promoted by tidal stresses or from effects of the current geomagnetic storm.

 

O: 22NOV2017 22:19:42  23.6N  120.7E ML=4.0  EMSC   TAIWAN                       

O: 22NOV2017 14:20:09  23.6N  120.7E ML=5.5  TAI    Chiayi, Taiwan              

O: 22NOV2017 22:19:42  23.6N  120.7E ML=4.0  TAI    Chiayi, Taiwan              

O: 22NOV2017 14:20:10  23.6N  120.7E Mw=5.1  EMSC   TAIWAN                       

P: 24NOV2017 112329    23.0N  121.0E 4.0-5.5 AAAAA  Taiwan                     

 

MODERATE EARTHQUAKE OFF NORTH ISLAND, NEW ZEALAND WITH NEW GEOMAGNETIC STORM

 

EARTHQUAKE SUMMARY FOR NOVEMBER 21, 2017

 

GEONET reported an earthquake with M 4.9-5.5 was felt with light intensity in  the area of northern North Island,  New Zealand. 18 people reported feeling this earthquake with 14 of weak intensity and 3 with light intensity and one with extreme intensity in North Island, New Zealand; none felt the quake with strong to severe intensity. This event which occurred with the beginning of a moderate geomagnetic storm today was likely promoted by effects from that storm. The last earthquake within about 200 km of this epicenter with M>=5.5 occurred more than a year ago on October 8, 2016 also with M 5.5. That event, in turn, was an aftershock of an M 7.1 about 250 km east of this on September 1, 2016. Forecasts 112497 and 112234 had expected this activity at the end of November.

 

The geomagnetic field was at minor storm conditions today.  The AP level was 28. High latitude geomagnetic field also saw stormy conditions with AP at 33. This may set off a new round of geomagnetic promotion of seismicity most likely around November 27 at geomagnetic equatorial zones and possibly at high latitudes if this storm should linger and intensify. Northern lights were visible with this storm as far south as northern U.S.

 

This event off New Zealand joins a series of earthquakes near 180 degrees longitude including strong quakes of M 7.0 in the Loyalty Islands and in Samoa of M 6.0. Moderate events in these regions continued today as well in the Loyalty Islands (M 5.2, 5.0) and in Tonga (M 4.9). Tidal stresses were strongest at this longitude during the recent new moon and had been expected in this summary to promote regional seismicity as:

 

"The new moon will arrive at 11:42 UT on November 18. Areas which are sub-solar at this time are near 5 degrees east longitude while those which area anti-solar are near 175 degrees west longitude. These include the Samoa/Tonga/Fiji/New Zealand areas and the Aleutians near the IDL and much of Europe. These regions are most likely to see tidal promotion of seismicity in the next week. Tidal stresses can help trigger seismicity in many areas, however and are not limited

to these longitude zones." (November 16-20, 2017)

 

 

O: 22NOV2017 07:42:57  36.3S  177.4E ML=4.9  GEONET Felt with light intensity

O: 22NOV2017 07:42:58  36.5S  177.5E mb=5.2  ANSS   Tairua New Zealand

O: 22NOV2017 07:42:58  36.4S  177.4E Mw=5.5  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 21NOV2017 112234    38.0S  176.0E 3.0-4.4 ABAAA  North Island, N.Z.         

P: 23NOV2017 112497    38.0S  176.0E 3.0-4.4 ABAAA  North Island, N.Z.         

P: 29NOV2017 112497    37.0S  177.0E 3.0-4.6 CAAAA  North Island, N.Z.         

 

Another earthquake reported with M>=5.5 today occurred in Minahasa, Sulawesi, Indonesia. BMG reported this earthquake was felt with intensity III-IV in Limboto, Bone Bolango and II in Minahasa, Indonesia. The last earthquake of M>=5.5 within about 100 km of this epicenter was an M 5.7 on January 13, 2017 (M 5.7). The only other such event in the past two years was an M 5.8 on October 27, 2016. Forecast 112260 expected this earthquake was likely around November 22.

 

O: 22NOV2017 01:11:23   0.4N  124.5E Mw=5.1  EMSC   MINAHASA, SULAWESI, INDONESIA

O: 22NOV2017 01:11:23   0.4N  124.5E Mw=5.1  EMSC   MINAHASA, SULAWESI, INDONESIA

O: 22NOV2017 01:11:23  00.3N  124.5E MS=5.5  BMG  Felt with intensity III-IV

P: 22NOV2017 112260     1.0N  126.0E 4.0-5.4 AABAA  Mindanao, Philippines      

 

The most unusual earthquake today occurred in the Central Mid-Atlantic Ridge with M 5.1. This is at the northern end of this section of the ridge and does not often see earthquakes of this magnitude. The last earthquakes within about 200 km of  this epicenter with M>=5.1 occurred on May 3, 2015 and October 20, 2014 both with M 5.1. The last within 350 km of significantly larger magnitude were an M 6.6 on June 24, 2013 and of M 6.9 on February 8, 2008. Forecast 112251 had  expected a moderate regional quake around November 22. The distance from this event to the M 7.0 in the Loyalty Islands is 148 degrees, a distance at which seismic energy is concentrated at the surface and can help promote further seismicity.

 

O: 21NOV2017 14:56:16   9.4N   40.6W mb=5.1  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P: 22NOV2017 112251     8.0N   38.0W 4.0-5.4 ABBAA  Central Mid-Atlantic Ridg  

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in the Vancouver Island region of British Columbia. NEIC reported it was felt with intensity I-III in British Columbia at Nanaimo, Cowichan Valley, Sooke, Victoria, and in Washington at Point Roberts, and Seattle. Earthquakes Canada did not identify any felt reports. This earthquake occurred within about an hour of local solar midnight and was probably promoted by geomagnetic and/or tidal effects. A series of events of M 5.0-5.2 hit the area in February, 2017 but the last of significantly larger manitude was an M 5.4 on September 6, 2008.  Forecast 112155 expected this event in this region around November 18.

 

O: 21NOV2017 17:51:16  49.2N  130.2W ML=3.4  NRCA  259 km WSW of Pt. Hardy

O: 21NOV2017 09:47:05  49.2N  130.0W ML=4.3  NRCA  253 km WSW of Pt. Hardy

O: 21NOV2017 09:47:09  49.5N  129.7W Mw=4.9  EMSC   VANCOUVER ISLAND, CANADA REGIO

P: 18NOV2017 112155    49.2N  129.1W 2.8-4.9 BAAAA  Vancouver Island area      

 

STRONG QUAKE SHAKES SAMOA AND WALLIS AND FUTUNA

 

EARTHQUAKE SUMMARY FOR NOVEMBER 20, 2017

 

An earthquake of M 6.0 occurred today in the region west of Samoa in Wallis and  Futuna. NEIC reported it was felt with intensity III in Halalo, Mua and Ahoa,  Hahake, Wallis and Futuna. This continued activation of the southwest Pacific area which included aftershocks of M 7.0 and 6.6 yesterday. This activation was expected in this summary as the area was among those at maximum tidal stress from the new moon of November 18.  This was noted in previous summaries as:

 

 

"The new moon will arrive at 11:42 UT on November 18. Areas which are sub-solar at this time are near 5 degrees east longitude while those which area anti-solar are near 175 degrees west longitude. These include the Samoa/Tonga/Fiji/New Zealand areas and the Aleutians near the IDL and much of Europe. These regions are most likely to see tidal promotion of seismicity in the next week. Tidal stresses can help trigger seismicity in many areas, however and are not limited

to these longitude zones." (November 16-19, 2017)

 

The last earthquake within about 200 km of today's epicenter in Samoa with M>=6 occurred on October 26, 2016 with M 6.0. The last of magnitude greater than 6.0 was an M 6.7 on June 29, 2014. The M 6.8 which occurred on November 4, 2017

was about 250 km southeast of today's epicenter. Forecast 112203 had expected

today's event in mid-November within about 150 km in Samoa.

 

O: 20NOV2017 18:51:05  14.6S  175.1W Mw=5.7  EMSC   SAMOA ISLANDS REGION         

O: 20NOV2017 18:51:07  14.6S  175.0W mw=6.0  ANSS   Mata-Utu Wallis and Futuna

P: 15NOV2017 112203    15.0S  174.0W 4.0-5.5 BAAAA  Samoa Islands              

 

The epicenter of the Samoa event today is at 175 West longitude as expected  in this forecast. On the other side of the world, an unusual earthquake of  M 2.5 in the Tyrol area of Austria was also felt.  NEIC reported this earthquake of M 2.5 in Austria was felt with intensity II-III in the area(s) of Tirol, Austria at Axams and Vols. The last felt earthquake within about 100 km of this event in Austria with M>=2.5 occurred on November 3, 2017 (M 3.5) with the last full moon and prior to that on December 12, 2013 (M 4.0). Forecast 112122 had expected a light to moderate quake in Austria associated with the new moon. The earthquakes in Samoa and Austria are separated by 145 degrees on the surface. Energy from the Samoa event (as well as the M 7.0 in the Loyalty Islands) would have concentrated on the surface in Austria and may have helped promote that event.

 

O: 20NOV2017 23:04:06  47.1N   11.4E ML=2.5  EMSC   AUSTRIA                      

O: 20NOV2017 23:04:06  47.1N   11.4E ml=2.5  ANSS   Neustift im Stubaital Austria

P: 15NOV2017 112122    49.0N    7.0E 3.0-5.3 BBCAA  Austria                     

 

The strongest quake in Central California in the current swarm there was an M 2.9. NEIC reported it was felt with maximum intensity IV in Soledad and II-III in Salinas, San Juan Bautista, Monterey and San Jose, California. Forecast 112073 had expected this within about 40 km around November 21. This area is at the fifth node (72 degrees) from Samoa and may have been  affected by energy from that event today.

 

O: 20NOV2017 14:03:15  36.6N  121.2W MD=2.6  EMSC   CENTRAL CALIFORNIA           

O: 20NOV2017 18:44:37  36.6N  121.2W ML=2.9  EMSC   CENTRAL CALIFORNIA           

O: 20NOV2017 19:17:40  36.7N  121.3W MD=2.3  EMSC   CENTRAL CALIFORNIA           

P: 21NOV2017 112073    36.9N  121.7W 2.5-4.5 AAAAA  Central California         

 

Two regional aftershocks were felt in the Iran-Iraq region today. A classical aftershock of the M 7.2 of November 12 was felt with intensity II near that epicenter at Halubah and as-Sulaymanayah, Iraq. The second of M 5.1 at a secondary epicenter in Iran was felt with intensity up to IV in Iran at Eilam, Aslamabad, and Khurramabad and in Iraq at Baghdad. Moderate aftershocks in the area have been uncommon. The last earthquake of M>=5.1 within about 100 km of

the eastern epicenter occurred on October 15, 2014 with M 5.6. This was an aftershock of an M 6.2 of August 18, 2014.  Forecast 112107 had expected this event within about 100 km likely near November 17.

 

O: 20NOV2017 15:35:56  34.6N   45.7E mb=4.5  EMSC   IRAN-IRAQ BORDER REGION      

P: 17NOV2017 112107    33.0N   48.0E 3.8-5.4 BBBAA  So. Iran                   

 

O: 20NOV2017 15:23:44  32.9N   46.5E mb=5.1  EMSC   IRAN-IRAQ BORDER REGION      

P: 17NOV2017 112107    33.0N   48.0E 3.8-5.4 BAAAA  So. Iran                   

 

The aftershock area of Chiapas, Mexico where an M 8.2 hit on September 9 remained active today. The largest earthquake in the region today was an M 5.3 near the epicenter of the mainshock. The last aftershock of M>=5.3 within about 100 km of today's event was an M 5.6 nearly two months ago on September 29, 2017. Forecast 112027 had expected today's event with moderate magnitude around November 18.

 

O: 21NOV2017 04:13:13  14.5N   93.7W mb=5.3  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 18NOV2017 112027    14.0N   93.0W 3.5-5.4 BAAAA  Chiapas, Mexico            

 

The U.S. and Canada remained at relative quiet conditions today. The largest earthquake reported today in the U.S. or Canada was an M 3.7 in the Arctic Ocean of Canada near Isachsen. This event which occurred on November 18 (Earthquakes Canada generally does not report activity over weekends) was not felt in the remote area. It is the largest earthquake within about 200 km of this epicenter since an M 4.5 on August 3, 2013. A series of moderate quakes hit the area in early October and mid-November, 2008 which included two events of M 5.7. Today's epicenter is about south of those epicenters. Forecast 111934 had expected today's event in this region was likely in mid-November, 2017.

 

O: 18NOV2017 18:25:04  79.1N  115.9W ML=3.7  NRCA  268 km W from Isachsen        

P: 10NOV2017 111934    80.0N  116.0W 4.0-5.4 CAAAA  Arctic Ocean Region        

 

SERIES OF TIDALLY PROMOTED STRONG TO MAJOR QUAKES HIT LOYALTY ISLANDS

 

EARTHQUAKE SUMMARY FOR NOVEMBER 19, 2017

 

A series of strong (6.3, 6.6, 5.9, 5.8) and major (M 7.0) earthquakes struck the Loyalty Islands south of Vanuatu today. These earthquakes tended to cluster near local solar midnight and local solar noon suggesting a strong promotion from the elevated tidal stresses associated with the new moon of November 18. On the opposite longitude an unusual earthquake of M 4.6 occurred within about an hour of local solar noon in northern Italy with M 4.6 and was also very likely to have been triggered by tidal stresses which maximized near this hour. The previous issue of this summary had expected this activity was likely at this time as:

 

"Events near local solar noon and midnight may occur today or tomorrow especially within about 20 degrees longitude of 175W. These include aftershock zones such as that associated with the Loyalty Islands event of M 6.7 of October 31 and the M 6.8 in Tonga of November 3, 2017. These areas could see a strong aftershock at this time." (November 18-19, 2017)

 

The more general forecast for tidally assisted seismicity at this time reads:

 

"The new moon will arrive at 11:42 UT on November 18. Areas which are sub-solar at this time are near 5 degrees east longitude while those which area anti-solar are near 175 degrees west longitude. These include the Samoa/Tonga/Fiji/New Zealand areas and the Aleutians near the IDL and much of Europe. These regions are most likely to see tidal promotion of seismicity in the next week. Tidal stresses can help trigger seismicity in many areas, however and are not limited to these longitude zones." (November 16-19, 2017)

 

Many of the larger earthquakes in today's swarm of strong Loyalty Islands quakes occurred within an hour of local solar noon and midnight. These included an M 5.9 at 00:09 UT on November 20 and an M 7.0 at 22:43 UT on November 19. These occurred near 11:00 am local time. An M 6.6 at 15:09 occurred within two hours of local solar midnight. This should not be surprising. When the initial activity began on October 31, this summary noted similar timing of those events in the main article:

 

"A strong M 6.8 earthquake occurred today in the Loyalty Islands between New Zealand and Vanuatu. It occurred within about 30 minutes of local solar noon and was probably promoted by tidal stresses which reach maximum levels at this hour. It was followed by an aftershock of M 5.9 about an hour-and-a-half later." (October 31, 2017)

 

The last earthquake of M>6.8 in the Loyalty Islands occurred more than six years ago on September 3, 2011, part of a sequence in 2011 which included event of M 7.0 on January 13 and M 6.9 on May 10, 2011. The last earthquake in the Loyalty Islands with M>7 was an M 7.3 nearly 10 years ago on April 9, 2008. The strongest in the area during the past 25 years as an M 7.7 on May 16, 1995.

 

The earthquakes today in the Loyalty Islands were reported felt in New Caledonia. The mainshock of M 7.0 was reported by NEIC to have been felt in New Caledonia with intensity IV in Tadine and II-III in Yate, Mont-Dore, Noumea, and Paita and in Villa, southern Vanuatu, with aftershocks felt at Dumbea with intensity IV (M 5.8). The M 6.6 foreshock was felt with intensity II-III in Mont-Dore, Dumbea and Noumea, New Caledonia; while the first strong shock in today's series, an M 6.4, was reported with intensity V in Mont-Dore and II-III in We and Noumea, New Caledonia. A weak tsunami may have been generated. Forecasts 112217 and 112218 had expected this activity in the Loyalty Islands was most likely around November 16-18. The Loyalty Islands are located at 102-104 degrees from recent strong quakes and aftershock sequences in Chiapas, Mexico and the Bouvet Island area of the south Atlantic. Seismic energy from large events concentrates at this distance on the surface and can help promote zonal seismicity in this distance range.

 

O: 19NOV2017 16:08:07  21.2S  168.6E Mw=5.9  EMSC   LOYALTY ISLANDS

O: 20NOV2017 02:20:54  21.2S  168.6E mb=5.1  EMSC   LOYALTY ISLANDS

O: 19NOV2017 10:48:53  21.3S  168.5E mb=4.8  EMSC   LOYALTY ISLANDS

O: 19NOV2017 18:58:20  21.3S  168.5E mb=4.8  EMSC   LOYALTY ISLANDS

O: 19NOV2017 22:59:02  21.3S  168.5E mb=5.1  EMSC   LOYALTY ISLANDS

O: 19NOV2017 22:43:30  21.3S  168.7E Mw=7.0  EMSC   LOYALTY ISLANDS

O: 19NOV2017 22:43:29  21.3S  168.7E mw=7.0  ANSS   Tadine New Caledonia

O: 19NOV2017 23:24:48  21.4S  168.6E mb=5.1  EMSC   LOYALTY ISLANDS

O: 20NOV2017 00:09:24  21.4S  168.8E Mw=5.8  EMSC   LOYALTY ISLANDS

O: 19NOV2017 15:09:04  21.5S  168.6E Mw=6.6  EMSC   LOYALTY ISLANDS

O: 20NOV2017 01:40:29  21.5S  168.7E mb=4.7  EMSC   LOYALTY ISLANDS

O: 19NOV2017 19:34:22  21.5S  168.8E Mw=5.3  EMSC   LOYALTY ISLANDS

O: 19NOV2017 09:25:47  21.5S  168.8E Mw=6.3  EMSC   LOYALTY ISLANDS

O: 19NOV2017 23:32:39  21.5S  168.8E mb=4.8  EMSC   LOYALTY ISLANDS

O: 19NOV2017 11:27:44  21.5S  168.8E mb=5.3  EMSC   LOYALTY ISLANDS

O: 19NOV2017 11:36:14  21.6S  168.6E mb=4.8  EMSC   LOYALTY ISLANDS

O: 19NOV2017 09:56:01  21.6S  168.8E Mw=5.2  EMSC   LOYALTY ISLANDS

O: 19NOV2017 22:01:01  21.7S  168.6E Mw=4.7  EMSC   LOYALTY ISLANDS

O: 19NOV2017 21:50:03  21.7S  168.6E Mw=4.8  EMSC   LOYALTY ISLANDS

O: 19NOV2017 19:43:24  21.8S  168.4E mb=4.8  EMSC   LOYALTY ISLANDS              

P: 16NOV2017 112217    22.0S  170.0E 4.0-5.5 BABAA  Loyalty Islands            

P: 18NOV2017 112218    23.0S  169.0E 4.0-5.6 ABAAA  Loyalty Islands            

 

Also of some importance from a tidal promotion viewpoint was the M 4.6-4.9 in northern Italy. This event near local solar noon was the strongest in northern Italy within about 150 km of this epicenter in more than four years - since an M 4.9 near today's epicenter on June 30, 2013, an aftershock of an M 5.4 on June 21, 2013. NEIC gave this event M 4.9 and reported maximum shaking intensity of IV in the Italian region of Emilia-Romagna at Medesano, Alseno, and in Bresso Lombardei, Italy. Shaking at intensity II-III levels was reported up to 150 km from the epicenter at Balema, Tessin Switzerland and in Italy at Baranzate, Carugate, Genoa, Brescia, Campagnola Emilia, Bore, Parma and Noceto, northern Italy. This epicenter is several hundred km southeast of the minor swarn in France of the past two days and had been expected to occur around November 18.

 

O: 19NOV2017 12:37:46  44.7N   10.1E Mw=4.6  EMSC   NORTHERN ITALY               

O: 19NOV2017 12:37:44  44.8N   10.1E mb=4.9  ANSS   W of Medesano Italy

P: 18NOV2017 112126    46.0N    6.0E 3.0-4.9 ABCAA  France                     

 

Seismicity in the U.S. and Canada was at low levels today. No events of M>=3 occurred in Alaska. The strongest earthquake was an M 3.7 in the Edmond, Oklahoma area which was felt within about 50 km. An interesting earthquake of M 2.5 occurred in area of Northridge, California. This reminds that the area is at the 22-23 year cyclic peak (1971 and 1994) and could see a moderate to strong earthquake this coming winter. The area of the valleys west of Los Angeles has been continuously active at a low magnitude level over the past month suggesting

considerable pent-up stress in the region. Today's event of M 2.5 is the strongest in the region since August 27 when the region saw an event of M 3.4. Forecast 112101 expected today's event within about 40 km was likely in mid-November. An M 4.8 at the antipode of the swarm in central California of the past several days also occurred today. The strongest event in the Central California sequence was also an M 4.6. The strongest aftershock in Central California today was an M 2.7 which occurred within about an hour of local solar midnight and was probably promoted by high tidal stresses at this hour. Forecast 112072 had expected this swarm to reach maximum output around November 15. This type of antipodal activity generally associates with strong geomagnetic or flare activity.

 

NEIC reported the earthquake of M 2.5 in Southern California was felt with intensity II-III in the area(s) of Los Angeles, California.

 

O: 19NOV2017 16:55:02  34.5N  118.8W Ml=2.5  EMSC   SOUTHERN CALIFORNIA          

P: 16NOV2017 112101    34.3N  118.5W 2.5-4.6 BAAAA  So. California             

 

O: 19NOV2017 15:30:39  36.6N  121.2W MD=2.1  EMSC   CENTRAL CALIFORNIA           

O: 19NOV2017 09:09:28  36.7N  121.3W MD=2.7  EMSC   CENTRAL CALIFORNIA           

P: 15NOV2017 112072    36.8N  121.3W 2.5-4.4 BAAAA  Central California         

 

The antipodal match for the Central California swarm in the South Indian Ocean appears to have been tidally promoted as it occurred within minutes of local solar noon. Forecast 112237 had expected this event was likely around November 21.

 

O: 19NOV2017 08:19:59  34.0S   58.0E mb=4.8  EMSC   SOUTH INDIAN OCEAN           

P: 21NOV2017 112237    35.0S   55.0E 4.0-5.6 AABAA  So. Indian Ocean           

 

The earthquake of M 3.7 in Oklahoma was widely felt within about 50 km of the Oklahoma City epicenter.  NEIC reported the earthquake of M 2.7 in Oklahoma was felt with intensity II-III in the area(s) of Yukon, Oklahoma. Events of M 2.9 and 3.7 earlier in the day near Edmond, Oklahoma were reported felt with intensity up to IV in Edmond, Spencer,  and Arcadia and II-III in Oklahoma City, Guthrie, Newcastle, Yukon, Stillwater, Prague, Bristow, and generally within about 100 km of the epicenter. Larger earthquakes in the central plains states of the U.S. began occurring in 2009 and have tended to coincide with new and full moons. The last of  M>3.7 was an M 4.1 coinciding with the Loyalty Islands mainshock of October 31. Oklahoma is located at 103 degrees from the Loyalty Islands and from the M 7.2 in the Iran/Iraq border of November 12, a distance at which effects of distant earthquakes is maximized. This may have helped promote today's earthquake. Forecast 112113 expected today's activity around November 18.

 

O: 19NOV2017 08:20:31  35.7N   97.4W mb=2.9  EMSC   OKLAHOMA CITY AREA, OKLAHOMA

O: 19NOV2017 08:12:50  35.7N   97.4W mb=3.7  EMSC   OKLAHOMA

O: 19NOV2017 23:42:38  36.1N   97.8W ML=2.7  EMSC   OKLAHOMA

O: 20NOV2017 00:52:22  35.4N   97.8W ML=2.3  EMSC   OKLAHOMA                     

P: 18NOV2017 112113    36.0N   97.0W 2.0-4.1 AAAAA  Southern Plains            

 

NEW MOON PROMOTES FRESH SEISMICITY

 

EARTHQUAKE SUMMARY FOR NOVEMBER 18, 2017

 

The new moon's arrival today probably helped promote a number of earthquakes  near local solar midnight and noon when tidal stresses are maximized. Global seismicity was at relatively active levels especially in the equatorial areas  of Indonesia, Tonga, and central and northern South America. The seismic tidal forecast for this period had read:

 

"The new moon will arrive at 11:42 UT on November 18. Areas which are sub-solar at this time are near 5 degrees east longitude while those which area anti-solar are near 175 degrees west longitude. These include the Samoa/Tonga/Fiji/New Zealand areas and the Aleutians near the IDL and much of Europe. These regions are most likely to see tidal promotion of seismicity in the next week. Tidal stresses can help trigger seismicity in many areas, however and are not limited to these longitude zones." (November 16-19, 2017)

 

Events near local solar noon and midnight may occur today or tomorrow especially within about 20 degrees longitude of 175W. These include aftershock zones such as that associated with the Loyalty Islands event of M 6.7 of October 31 and the M 6.8 in Tonga of November 3, 2017. These areas could see a strong aftershock at this time.

 

An M 4.6 in Tonga/Samoa which occurred within minutes of local solar noon. This was a sub-solar earthquake, meaning the epicenter and timing of the event occurred when the sun was directly overhead, maximizing tidal stresses. This is not  an unusual earthquake but the timing is of interest. Forecast 112203 had  expected this event around November 15. This is an aftershock of the M 6.8 in

Samoa of November 4 as discussed above.

 

O: 18NOV2017 23:58:04  16.9S  173.5W mb=4.6  EMSC   TONGA                        

P: 15NOV2017 112203    15.0S  174.0W 4.0-5.5 BBAAA  Samoa Islands              

 

The strongest earthquake of the day was an M 5.8-5.9 in Halmahera, Indonesia, part of a series of five moderate quakes at this epicenter today. It was not reported felt in the area. The M 5.9 occurred within about an hour of local solar midnight and may have been promoted by high tidal stresses which maximized at this time. The last earthquake of M>=5.9 in this area within about 200 km of this epicenter occurred as an M 6.5 three years ago on November 21, 2014 and prior to that on November 19, 2013 with M 6.1. Earthquakes that repeat at about the same time of year can be promoted by seasonal fluctuations such as those related to weather. A tropical storm (Kirogi) passed through this region several days ago and may have promoted today's seismicity. Forecast 111995 had expected this activity within about 50 km was likely in mid-November. 

 

O: 18NOV2017 18:36:42   2.5N  128.1E Mw=5.3  EMSC   HALMAHERA, INDONESIA

O: 18NOV2017 16:07:02   2.6N  128.2E Mw=5.8  EMSC   HALMAHERA, INDONESIA

O: 18NOV2017 16:07:02   2.4N  128.1E Mw=5.9  ANSS   HALMAHERA, INDONESIA

O: 19NOV2017 03:15:43   2.6N  128.4E mb=4.7  EMSC   HALMAHERA, INDONESIA

O: 18NOV2017 19:13:07   2.4N  128.2E mb=5.0  EMSC   HALMAHERA, INDONESIA         

P: 14NOV2017 111995     3.0N  128.0E 4.0-5.6 BAAAA  Halmahera                  

 

Three earthquakes of M>=5 occurred in the region of Central and northern South America today. Two of M 5.1-5.2, the first in more than a month with M 5.2,  rattled the region of aftershocks of the September 8.2 quake in Chiapas, Mexico and a third hit northern Venezuela also with M 5.2-5.3. A series of events in Ecuador also continued in a series which has been active since the M 7.2 in Iran. The largest of these today was an M 5.4. They are located at the third node from that earthquake (120 degrees) and are likely being promoted from that source. Costa Rica has also continued to see moderate aftershocks.

 

The strongest in this series of events in Central America and northern South America today was an M 5.4 near the coast of Ecuador. This earthquake occurred within about half an hour of local solar midnight and was probably promoted by high tidal stresses associated with the new moon at this hour.  NEIC reported this earthquake of M 5.4 in Ecuador was felt with maximum intensity V in Balao, Guayas, Ecuador and IV in Cuenca and Eloy Alfaro, Huaquillas, Azogues, Samborondon, and Cariamanga, Ecuador and intensity II-III in the area(s) of Machala, Santa Rosa, Guayaquil, Riobamba, and Loja, Ecuador. It was also felt in Tumbes, Peru.   The last earthquake of M>=5.4 in the area within about 200 km of this epicenter occurred on June 5, 2017 with M 5.6  and prior to that on October 15, 2015 also with M 5.4. Forecast 112003 had expected an event with magnitude up to M 5.6 in Ecuador around November 19. Further to the south near the Peru border a series of lighter events was also occurring over the past several days. These are located at the third node (120 degrees) from Iran and were likely promoted from that M 7.2 source.

 

O: 18NOV2017 04:23:46   2.8S   79.6W Mw=5.4  EMSC   NEAR COAST OF ECUADOR        

P: 19NOV2017 112003     2.0S   78.0W 4.0-5.6 AABAA  Ecuador                    

 

NEIC reported the earthquake of M 4.4 in northern Peru was felt with intensity II-III in the area(s) of Talara, Piura, Peru and Santa Rosa, El Oro, Ecuador.

 

O: 18NOV2017 21:30:23   3.0S   80.1W ML=3.8  EMSC   PERU-ECUADOR BORDER REGION   

O: 18NOV2017 23:03:54   4.1S   80.5W ML=4.5  EMSC   PERU-ECUADOR BORDER REGION

O: 18NOV2017 07:22:33   4.2S   79.4W ML=3.9  EMSC   PERU-ECUADOR BORDER REGION

O: 19NOV2017 03:35:48   4.3S   80.7W mb=4.4  EMSC   PERU-ECUADOR BORDER REGION

P: 21NOV2017 112003     4.0S   80.0W 4.0-5.4 BAAAA  Ecuador                    

 

The earthquakes in the Chiapas aftershock zone occurred within about an hour of  local solar noon and were probably promoted by high tides at this time of day. NEIC reported this earthquake of M 5.2 in Chiapas, Mexico was felt with intensity II-III in the area(s) of Mapastepec, Chiapas, Mexico.  Earthquakes of M>=5.2 have not been common in recent weeks in the aftershocks zone but have tended to concentrate with full and new moons. The last event in the aftershock zone of M>=5.2 occurred a month ago with M 5.4 on October 14 and prior to that on September 29, 2017 (M 5.6). Forecast 102027 had expected a moderate  earthquake in this area around November 18.

 

O: 18NOV2017 17:07:25  15.3N   93.8W Mw=5.2  EMSC   OFFSHORE CHIAPAS, MEXICO     

O: 18NOV2017 17:07:23  14.9N   94.1W ML=5.2  UNAM  al SUROESTE de PIJIJIAPAN, CHIS *:

P: 18NOV2017 112027    14.0N   93.0W 3.5-5.4 ABAAA  Chiapas, Mexico            

 

O: 18NOV2017 19:17:32  15.7N   95.0W ML=5.1  UNAM  l SURESTE de SALINA CRUZ, OAX *: 1

P: 16NOV2017 112028    15.0N   95.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

The M 5.1 in northern Venezuela near Merida and Tachira occurred as a tropical storm system was passing through the area as identified yesterday by NHC as an area of a tropical storm warning at this time. The storm did not develop winds high enough to become a tropical cyclone and the warning was lifted. The M 5.1 earthquake, near the eye of this storm, however was probably promoted by stresses associated with the storm. The last event of M>=5.1 within about 200 km of this epicenter occurred on October 14, 2017 also with M 5.1 and prior to that on  October 1, 2017 (M 5.1). The area had been quiet since November, 2015. Forecast 112044 had expected this event in mid-November about 150 km north of today's epicenter.

 

NEIC reported this earthquake of M 5.1 in Venezuela was felt with maximum intensity V in Tariba, Tachira, Venezuela and intensity II-III in the area(s) of Venezuela at Ejido, San Cristobal, Maracaibo, San Fernando, and at Envigado, Colombia.

 

O: 18NOV2017 05:54:56   8.4N   71.8W Mw=5.1  EMSC   MERIDA, VENEZUELA

O: 18NOV2017 07:30:28   8.4N   71.9W Mw=3.4  EMSC   TACHIRA, VENEZUELA

O: 18NOV2017 14:18:20   8.4N   71.8W Mw=3.6  EMSC   TACHIRA, VENEZUELA           

P: 12NOV2017 112044    10.0N   71.0W 3.5-5.0 CBAAA  Northern Venezuela         

 

An unusual earthquake of M 4.2 occurred today in Rajasthan, India. It was reported lightly felt in the region. The last earthquake of M>=4.2 in Rajasthan was an M 4.5 about 300 km southwest of this epicener on March 13, 2017. The last such event within about 250 km of this epicenter was an M 4.6 on November 9, 2010, the only event in this area of M>=4.2 in the past 25 years. Earthquakes  hit northwest and northeast of this about 250 km away on August 10, 2003 (M 4.5) and May 11, 1998 (M 5.2).  Forecast 112055 had expected the area could see a moderate quake in mid-November.

 

O: 18NOV2017 09:51:19  26.4N   73.8E ML=4.2  EMSC   RAJASTHAN, INDIA             

P: 14NOV2017 112055    24.0N   71.0E 3.5-5.3 BCCAA  India                      

 

The strongest earthquake in the U.S. or Canada today was an M 3.5 in Southern Alaska. The last earthquake of M>=3.5 within about 100 km of this epicenter occurred on October 31 and November 3, 2017, both with M 3.5. The last event in the region of larger magnitude than M 3.5 occurred July 11, 2017 with M 4.4. Forecast 112186 had expected this event within about 10 km of the epicenter was likely around November 17. The Aleutians are likely to see increased seismicity in the next several days including the possibility of a moderate earthquake in the Andreanof Islands due to high tidal stresses. An M 3.1 today in that area may be a foreshock to a larger event.

 

O: 19NOV2017 00:45:07  61.5N  146.5W ML=3.5  EMSC   SOUTHERN ALASKA              

P: 17NOV2017 112186    61.4N  146.5W 3.2-5.1 AAAAA  Central Alaska             

 

O: 18NOV2017 19:17:55  51.2N  178.2W ML=3.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 19NOV2017 112160    51.6N  180.0W 3.5-5.0 AABAA  Andreanoff Isls, Aleutians 

 

STRONG EARTHQUAKE HITS XIZANG (TIBET)

 

EARTHQUAKE SUMMARY FOR NOVEMBER 17, 2017

 

A strong earthquake of M 6.3 hit the border area between Xizang, China and India today. The mainshock was damaging in the epicentral area. NEIC reported intensity V as far as 250 km from the epicenter in Dibrugarh, Assam, India and IV in Lakhimpur, Gauhati, North Guwahati, Assam and II-III in Chengdu, Sichuan, China and in Assam India at Dispur, Nagaon, Jorhat, Sonari, Dulia Gaon, Tinsukia, and in Ziro, Arunachal Pradesh. Aftershocks were felt with intensity II in Along, Arunachal Pradesh, India. The China Earthquake Administration indicated there were no known casualties but that several homes were damaged. The quake occurred during the Tibetan New Year Festival. In the previous issue of this summary this area had been emphasized as a zone in which seismicity was likely to be enhanced by tidal stresses at this time as:

 

"November 18 sees the arrival of the new moon. High tidal triggering is likely at this time, both in the areas sub-solar and anti-solar at the time of the new moon and in the previous full moon. These areas were outlined in this summary as follows:

 

"The full moon  arrived at 05:23 UT on November 4, 2017. Longitudes which were sub-lunar (local solar midnight) at this time are located near 83 West longitude while those which are sub-solar are at 97 East longitude." (November 6-10, 2017)

(November 16-17, 2017)

 

It is also likely that motions of Southern Asia associated with several recent tropical storms in the region helped promote this earthquake at this time.  A tropical storm which formed yesterday west of the Philippines (TS Kirogi) was the most recent of these but TS Haikui may have also affected the area as noted in previous summaries:

 

"TS Haikui (39W) dissipated today in the area  of Vietnam with winds up to 35 kts. It is expected continue on towards Vietnam in the next several days. Seismicity may be promoted on strike-slip faults in Southern Asia as far as Afghanistan over the next several days as TS Haikui makes landfall." (November 12, 2017)

 

Today's earthquake (which occurred at 95 East longitude as expected above) is the strongest within about 200 km of this epicenter in  at least 25 years. Earthquakes of M 5.8 hit the region on August 11, 2013 and June 1, 2005. Forecast 112106 had expected a moderate event in this area was likely in mid-November.

 

O: 17NOV2017 22:34:19  29.9N   95.1E Mw=6.3  EMSC   EASTERN XIZANG-INDIA BORDER RE

O: 18NOV2017 00:32:01  30.0N   94.8E mb=5.1  EMSC   EASTERN XIZANG-INDIA BORDER RE

O: 18NOV2017 02:13:39  30.0N   95.3E mb=4.1  EMSC   EASTERN XIZANG               

O: 18NOV2017 03:36:06  30.1N   95.1E mb=4.2  EMSC   EASTERN XIZANG               

P: 13NOV2017 112106    32.0N   95.0E 3.5-5.3 BBAAA  So. China                  

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 in Southern Alaska. NEIC reported this event was felt with maximum intensity IV in Kasilof, Alaska and II-III in Kenai, Soldotna, Cooper Landing, Anchorage, Alaska. The last earthquake of M>=4.4 in the Kenai Peninsula was an M 4.7 on August 27, 2017.

A moderately strong quake on May 20, 2017 may have been the mainshock for this sequence. Forecast 112181 had expected today's event was likely within about 100 km of this epicenter around November 17.

 

O: 17NOV2017 21:16:35  60.6N  150.7W ML=4.4  EMSC   KENAI PENINSULA, ALASKA      

P: 17NOV2017 112181    60.2N  151.7W 3.2-5.0 AAAAA  Central Alaska             

 

The strongest earthquake in the U.S. or Canada outside Alaska today was an M 3.7 in the Gaspe Peninsula near Moisie, Quebec, Canada. Earthquakes Canada reported this earthquake of M 3.7 in Quebec, Canada was felt with intensity II-III in the area(s) of Sept-Iles, QC. The last light earthquake in this area occurred about 200 km southwest of this epicenter with M 3.1 on October 6, 2017 but the last within this area with M>=3.7 was an M 4.1 on January 16, 2015 and prior to that an M 4.4 on September 21, 2013. There were no such events in the region from 2002 to 2013. Forecasts 112132 and 112125 had expected today's event was likely within about 100 km of this epicenter around November 18-21.

 

O: 17NOV2017 18:07:06  49.9N   66.2W ML=3.7  EMSC   GASPE PENINSULA, CANADA      

O: 17NOV2017 18:07:05  50.0N   66.2W ML=3.7  NRCA  22 km SW from Moisie

P: 18NOV2017 112132    49.3N   67.5W 2.0-4.3 AAAAA  Maine                      

P: 21NOV2017 112125    49.0N   66.0W 2.0-4.4 BAAAA  E. of Maine                

 

An unusual series of earthquakes were felt in eastern France today beginning with an M 3.5 and M 3.2 within minutes of local solar noon. These were felt in the area.  NEIC reported these earthquakes of M 3.2 and M 3.5 in France were felt with intensity II-III in the area(s) of Grignon and Saint-Priest, Rhone, France and in Saint-Martin-de-Crau, France.  They were probably promoted by high tidal stresses associated with the upcoming new moon as the time of occurrence indicates. The last earthquake identified by NEIC within about 150 km of this epicenter with M>=3.5 occurred  on  June 30, 2010 with M 4.3. More recent activity has occurred about 150 km northeast of this on July 1, 2017 and October 24, 2016 (M 4.1 and 4.4). Forecast 112126 had expected this activity was likely within about 50 km of the epicenter around November 18.

 

O: 17NOV2017 08:07:54  45.5N    6.3E ML=2.9  EMSC   FRANCE                       

O: 17NOV2017 12:07:48  45.5N    6.3E ML=3.2  EMSC   FRANCE                       

O: 17NOV2017 12:10:23  45.5N    6.3E ML=3.5  EMSC   FRANCE                       

P: 18NOV2017 112126    46.0N    6.0E 3.0-4.9 AAAAA  France                     

 

TIDAL STRESSES HELP PROMOTE LARGER EARTHQUAKES

 

EARTHQUAKE SUMMARY FOR NOVEMBER 16, 2017

 

November 18 sees the arrival of the new moon. High tidal triggering is likely at this time, both in the areas sub-solar and anti-solar at the time of the new moon and in the previous full moon. These areas were outlined in this summary as follows:

 

 

"The full moon  arrived at 05:23 UT on November 4, 2017. Longitudes which were sub-lunar (local solar midnight) at this time are located near 83 West longitude while those which are sub-solar are at 97 East longitude." (November 6-10, 2017)

 

and

 

"The new moon will arrive at 11:42 UT on November 18. Areas which are sub-solar at this time are near 5 degrees east longitude while those which area anti-solar

are near 175 degrees west longitude." (November 15-16, 2017)

 

Today's strongest events (in the Drake Passage M 5.3 and in the Solomon Islands M 5.6) occurred within about an hour of local solar midnight and noon, times when tidal stresses are high and could help promote moderate to large earthquake in these areas.

 

A second strong earthquake in the past week occurred today south of Tokyo, Japan in the Izu Islands with M 5.8. NEIC reported it was felt with intensity II-III in the prefectures of Kanagawa, Chiba, Tokyo, Saitama and Fukushima, Japan. An M 6.0 quake hit the Izu Islands on November 9 about 100 km east of today's epicenter. When this occurred this summary noted:

 

"Some geoscientists think the coming Tokyo earthquake will be preceded by a strong earthquake in the Izu Islands." (November 9, 2017)

 

Forecast 112093 had expected this earthquake was likely within about 100 km of this epicenter around November 18.

 

O: 16NOV2017 09:43:35  32.3N  140.5E Mw=5.8  EMSC   IZU ISLANDS, JAPAN REGION    

O: 16NOV2017 09:43:35  32.2N  140.5E mw=5.8  ANSS   SE of Hachijo-jima Japan

P: 18NOV2017 112093    33.0N  140.0E 4.0-5.6 AAAAA  Off East Coast Honshu      

 

An unusual earthquake of M 5.3 occurred today in the Drake Passage between Antarctica and South America. This is a remote area and this earthquake was not reported felt in the area. The last earthquake within about 500 km of this epicenter was an M 5.4 on January 29, 2017 and prior to that on October 20, 2015 with M 5.5-5.6. A strong earthquake of M 6.6 hit the area about 400 km southeast of this on January 15,, 2012.

 

O: 16NOV2017 15:51:42  58.6S   62.9W Mw=5.3  EMSC   DRAKE PASSAGE                

 

A moderately strong earthquake also occurred today in the Solomon Islands with M 5.3-5.6. NEIC reported this earthquake of M 5.6 in the Solomon Islands was felt with intensity II-III in the area(s) of Honiara, Guadalcanal, Solomon Islands.

The last earthquake with M>=5.6 within about 150 km of this epicenter was an M 5.8 on August 6, 2017 and prior to tat an M 6.5 on January 19, 2017.

Forecast 112211 had expected this earthquake was likely within about 100 km of the epicenter around November 15.

 

O: 16NOV2017 14:50:07  10.1S  161.0E ML=5.3  EMSC   SOLOMON ISLANDS              

O: 16NOV2017 14:50:04  10.1S  160.9E mb=5.6  ANSS   Kirakira Solomon Islands

P: 15NOV2017 112211    11.0S  161.0E 4.0-5.6 AAAAA  Vanuatu Islands            

 

Aftershocks of the M 4.6 two days ago continued in central California and included two events of M 3.2 in this active series. Forecast 112072 had expected this activity within about 10-15 km of the epicenters was most likely around November 15. It is active for an distance of about 20-30 km along the area of Central California and could be precursory to a larger coming event in the region.

 

NEIC reported this earthquake of M 3.2 in Central California was felt with intensity II-III in the area(s) of Soledad, Hollister, Salinas and Carmel Valley, California.

 

O: 17NOV2017 04:09:01  36.6N  121.2W MD=2.8  EMSC   CENTRAL CALIFORNIA

O: 17NOV2017 01:17:08  36.6N  121.2W ML=2.9  EMSC   CENTRAL CALIFORNIA

O: 16NOV2017 23:08:33  36.6N  121.2W ML=3.2  EMSC   CENTRAL CALIFORNIA

O: 17NOV2017 03:27:59  36.6N  121.2W ML=3.2  EMSC   CENTRAL CALIFORNIA

O: 16NOV2017 12:43:14  36.7N  121.3W MD=2.3  EMSC   CENTRAL CALIFORNIA

O: 16NOV2017 10:03:27  36.6N  121.2W MD=2.2  EMSC   CENTRAL CALIFORNIA           

P: 15NOV2017 112072    36.8N  121.3W 2.5-4.4 AAAAA  Central California         

STRONG SEISMICITY CONTINUES IN LOYALTY ISLANDS

 

EARTHQUAKE SUMMARY FOR NOVEMBER 15, 2017

 

Strong aftershocks continued today in the region of the Loyalty Islands south of Vanuatu. The strongest of these was an M 5.8. This is an energetic aftershock sequence of the M 6.7 of October 31 and may be expected to continue for several more weeks with moderate to moderately strong aftershocks. A second mainshock of M>6 is also possible in this area.

 

O: 16NOV2017 07:02:37  21.4S  168.7E Mw=5.9  EMSC   LOYALTY ISLANDS

O: 16NOV2017 07:37:21  21.5S  168.5E Mw=5.3  EMSC   LOYALTY ISLANDS

O: 16NOV2017 07:26:19  21.5S  168.6E mb=4.8  EMSC   LOYALTY ISLANDS

O: 16NOV2017 08:23:56  21.6S  168.6E Mw=4.7  EMSC   LOYALTY ISLANDS

O: 16NOV2017 07:03:56  21.6S  168.8E Mw=5.5  EMSC   LOYALTY ISLANDS

O: 16NOV2017 03:27:41  21.5S  168.5E ML=5.0  EMSC   LOYALTY ISLANDS

O: 15NOV2017 21:42:59  21.5S  168.5E mb=4.9  EMSC   LOYALTY ISLANDS

O: 16NOV2017 03:28:59  21.6S  168.5E mb=5.3  EMSC   LOYALTY ISLANDS

O: 15NOV2017 22:32:32  21.8S  168.9E mb=5.0  EMSC   LOYALTY ISLANDS

O: 15NOV2017 20:23:05  21.8S  169.1E Mw=5.4  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 15NOV2017 23:32:37  21.9S  168.9E Mw=4.9  EMSC   LOYALTY ISLANDS

O: 15NOV2017 18:37:02  21.9S  168.9E mb=4.9  EMSC   LOYALTY ISLANDS

O: 15NOV2017 21:10:15  21.9S  168.9E mb=5.0  EMSC   LOYALTY ISLANDS

O: 15NOV2017 08:23:19  21.9S  168.9E mb=5.1  EMSC   LOYALTY ISLANDS

O: 15NOV2017 20:37:05  21.9S  169.0E Mw=4.9  EMSC   SOUTHEAST OF LOYALTY ISLANDS

O: 15NOV2017 21:57:23  21.4S  168.7E mb=4.5  EMSC   LOYALTY ISLANDS              

P: 16NOV2017 112217    22.0S  170.0E 4.0-5.5 AAAAA  Loyalty Islands            

 

An unusual earthquake of M 5.1 was strongly felt in Azerbaijan today. This was likely promoted by the M 7.2 earthquake of November 12 on the Iran-Iraq border. NEIC reported the Azerbaijan quake was felt with minor damage in Azerbaijan at Xankendi and Berde. Lesser shaking of IV was reported felt in Agcabedi, Mingecevir, Askeran, Qebela, Parsabad, Seki, and intensity II-III within about 200 km of the epicenter at Pushkino, Sumqayit, Badamdar, Baki. It was also reported lightly felt in Rustavi and Zahesi, Georgia; in Armenia at Yerevan, Kurtan, and NorKesaria and Tabriz, Iran. This is the strongest earthquake in Azerbaijan within about 200 km of this epicenter since an M 5.1 on May 11, 2017. The last earthquake of stronger magnitude in the region was an M 5.3 on August 1, 2016 and an M 5.4 on September 4, 2015. Forecast 112130 expected this event to the east around November 20.

 

O: 15NOV2017 19:48:04  40.3N   47.3E Mw=5.1  EMSC   AZERBAIJAN                   

P: 20NOV2017 112130    40.0N   52.0E 4.0-6.0 BACAA  Kazakhstan                 

 

An earthquake of M 5.0 in Palau was widely felt in that nation today. This unusual quake was felt with intensity V in Palau at Oikul, Melekeok, Meyungs, and II-III in Airai, Koror, Ngermechau, Imeong and Kloulklubed, Palau.

This event was probably triggered by stress redistribution from the M 5.8 in  Guam which occurred yesterday. Guam is about 1000 km northeast of the Palau epicenter. The last earthquake in Palau within about 200 km of this epicenter with M>=5 occurred on January 25, 2016 with M 5.0-5.1. The last of larger magnitude occurred October 23, 2011 with M 5.3 near today's epicenter. Forecast 112026 expected a regional event around November 19.

 

O: 15NOV2017 21:19:20   7.3N  134.6E mb=5.0  EMSC   PALAU REGION                 

P: 19NOV2017 112026    10.0N  138.0E 3.5-4.9 BCCAA  Caroline Islands           

 

Moderate aftershocks also continued in South Korea following the M 5.4 there earlier in the day. The strongest aftershock was an M 4.7. NEIC reported it was felt with intensity IV in Yeonil and II-III in Kimhae, Cheongju, P'yongt'aek, Paengsong, Kunsan, Osan, Seoul, Chemulpo, South Korea. Forecast 112082 had expected this activity to the east around November 19.

 

O: 16NOV2017 00:02:42  36.1N  129.4E ML=3.8  EMSC   SOUTH KOREA                  

O: 15NOV2017 07:49:30  36.1N  129.4E mb=4.7  EMSC   SOUTH KOREA                  

P: 19NOV2017 112082    34.0N  132.0E 3.5-5.0 BBBAA  Kyushu, Japan area         

 

Three moderate earthquakes occurred in the Aleutians and the Alaska Peninsula today with M 4.4-4.7. These may presage an active period in the region associated with the new moon of November 18 which which is at its maximum near local solar midnight. Maximum stresses occur at 175 West longitude. One of the events of M 4.4 in the Andreanof Islands today occurred at 175 West longitude and was  probably promoted by tidal stresses.

 

O: 15NOV2017 17:20:04  51.0N  169.7W mb=4.7  EMSC   SOUTH OF ALEUTIAN ISLANDS    

P: 16NOV2017 112165    52.4N  169.4W 3.5-5.2 ABAAA  Fox Islands, Aleutians     

 

O: 16NOV2017 01:09:22  51.5N  174.9W ML=4.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 17NOV2017 112159    51.1N  175.8W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

NEIC reported the earthquake of M 4.4 in the Alaska Peninsula was felt with intensity II-III in the area(s) of Sand Point and Chignik, Alaska.

 

O: 15NOV2017 11:52:03  55.2N  159.3W mb=4.4  EMSC   ALASKA PENINSULA             

P: 16NOV2017 112177    54.5N  161.8W 3.5-4.9 AABAA  Unimak Islands, Aleutians