STRONG EARTHQUAKE SHAKES MINDANAO, PHILIPPINES

 

EARTHQUAKE SUMMARY FOR OCTOBER 16, 2019

 

The strongest earthquake in the world today was an M 6.4 in southern Mindanao, Philippines. NEIC reported it was felt with maximum intensity VII in Southern Mindanao at Koronadal, Kidapawan andDigos; VI in Columbio, Tulunan, and Kabacan; V in Tacurong ad Sulit and IV in Bagontapay and Kalawag among others. An aftershock of M 5.0 was felt in Buayan Southern Mindanao with intensity III. A regional aftershock of M 5.1 was felt with intensity IV in Mindanao at Mabantao and Davao and III in Ula, Philippines. This is the strongest earthquake in the world since an M 6.8 on September 29, 2019. Only four such quakes have occurred in the past 2.5 months - in Seram, Indonesia on September 25 (M 6.5); Tonga on September 1 (M 6.6) and the South Sandwich Islands on August 27 (M 6.6). It is also the strongest in the region of Mindanao, Philippines since an M 7.0 on December 29, 2018 and prior to that an M 6.9 on April 28, 2017. These followed a regional quiet period from July 2010 after an M 7.6 hit the area. Forecast 119214 had expected today's activity within about 100 km was likely

between October 13 and 17. The activation of the San Francisco Bay area, California is at 103 degrees from this event in Mindanao and some linkage is possible between the two areas.

 

O: 16OCT2019 11:37:05   6.8N  125.0E Mw=6.4  EMSC   MINDANAO, PHILIPPINES

O: 16OCT2019 12:09:30   6.8N  125.1E Mw=5.3  EMSC   MINDANAO, PHILIPPINES

O: 16OCT2019 13:35:05   6.8N  125.2E ML=4.2  EMSC   MINDANAO, PHILIPPINES

O: 16OCT2019 13:41:58   7.1N  125.3E ML=4.0  EMSC   MINDANAO, PHILIPPINES

O: 16OCT2019 20:53:53   7.3N  126.6E Mw=5.1  EMSC   MINDANAO, PHILIPPINES

O: 16OCT2019 21:10:17   7.6S  127.9E mb=4.9  EMSC   KEPULAUAN BARAT DAYA, INDONESIA

O: 17OCT2019 01:28:56   5.2N  126.2E Mw=5.0  EMSC   MINDANAO, PHILIPPINES        

O: 16OCT2019 12:21:00   6.7N  125.2E mb=4.9  EMSC   MINDANAO, PHILIPPINES        

P: 13OCT2019 119214     5.0N  125.0E 4.0-5.3 BBAAA  Mindanao, Philippines      

P: 17OCT2019 119214     6.0N  127.0E 4.0-5.3 AABAA  Halmahera                  

 

The strongest earthquakes in the U.S. or Canada today occurred in the Kodiak Island region of Alaska. The last earthquakes of M>=3.6 in the Kodiak Island region within about 100 km of these epicenters occurred October 14, 2019 with M 4.0 and today's events are probably aftershocks of that. These events of M 3.5 and 3.6 were considered likely to the south of these epicenters in forecast 119392 around October 14.

 

O: 16OCT2019 09:59:21  56.1N  153.2W ml=3.6  EMSC   KODIAK ISLAND REGION, ALASKA 

O: 16OCT2019 10:21:14  56.2N  153.2W ml=3.5  EMSC   KODIAK ISLAND REGION, ALASKA 

P: 14OCT2019 119392    55.0N  149.0W 3.0-4.5 ABBAA  Gulf of  Alaska            

 

MODERATE SEISMICITY EXPANDS IN CENTRAL AND NORTHERN CALIFORNIA

 

EARTHQUAKE SUMMARY FOR OCTOBER 15, 2019

 

The strongest earthquake in California today was an M 4.7 south of San Francisco. NEIC reported it was felt with maximum intensity VI in the epicentral area and V in Gonzales with IV in Hollister, Soledad and San Juan Bautista. Intensity II-III was also felt in Salinas, Paicines and other areas of central California. This is not a classical aftershock of yesterday's M 4.6 in San Francisco but is a separate mainshock. It was probably triggered by stress redistribution following yesterday's event. It occurred within minutes of local solar noon, a time when tidal stresses maximize and may have been promoted by stresses associated with the full moon as noted in previous issues of this summary:

 

 

"The full moon arrived on October 13 at 21:08 UT. Longitudes which were sub-solar at this time area near 45 East and 135 West longitude. These include areas of Turkey and Iran in the east and the northwestern edge of the North American Plate in the west. These are most likely to see tidal triggering at this time but tidal triggering can occur in a number of tectonic settings. Seismic enhancement is most likely a promoter of seismicity near local solar noon and local solar midnight." (October 11-14, 2019)

 

An earthquake of M 3.4 was also felt with intensity II-III in northern San Francisco Bay today according to NEIC. Felt reports came from Pleasant Hill, Concord, Walnut Creek, Lafayette and in general within about 50 km of the epicenter. This is north of the M 4.6 mainshock yesterday but could be part of the aftershock series. Forecast 119284 had expected this event within about 15 km was likely around October 18.

 

O: 16OCT2019 02:11:58  38.0N  122.1W ML=3.4  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 18OCT2019 119284    38.0N  122.3W 2.5-4.3 AAAAA  Central California         

 

In the previous issue of this summary it was noted that this activity is near the culmination of a period of enhanced seismicity in central and northern California as:

 

 

"It is likely that moderate earthquakes in the area including to the south will continue for several more days. Several days ago this summary had warned of this type of activity in the San Francisco Bay area was likely in mid-October when an M 3.4 occurred in the area as:

 

"A light earthquake of M 3.4 was widely felt in the area of San Francisco Bay area of California today. NEIC reported this earthquake of M 3.3 in the San Francisco, California area  was felt with intensity II-III in the area(s) of the San Francisco, California area at San Jose, Milpitas, Livermore, Santa Clara, Fremont, Sunnyvale, Morgan Hill and in general within about 50 km of the epicenter. This continues regional seismicity which has been at enhanced levels during October. The area often sees elevated seismicity in mid-October, perhaps related to  meteorologic promoters. The Loma Prieta quake of M 7.2 on October 20, 1989 was probably triggered by strong solar flares of X10+ which occurred on the same day." (October 10-11, 2019)

 

Several days earlier a series of events in the San Francisco area was noted as follows in this summary:

 

"When a similar event of M 3.5 hit north of this on October 1, 2019 this summary noted:

 

"An unusual earthquake of M 3.5 hit off the coast of Northern California today but south of the normal seismicity in the region. Unusual earthquakes in this area can indicate a built-up stress in need of release in a larger earthquake. This is the farthest event to the west in the area 39-40N 139-142W in the past 30 years. It may be related to the energetic swarm currently occurring in the Hayward area of the San Francisco Bay region which also continued today." (October 1, 6, 15, 2019)

 

A strong nor-easter is occurring in New England at this time. It is thought it may reach atmospheric pressures never before encountered in October. Nor'easter's have been linked in this summary to enhanced seismicity in the northwestern portion of North America and this could extend the activation of central California to the north over the next several days.

 

The M 4.8 occurred in a creeping section of the San Andreas Fault zone where moderate or large earthquake are rare. The last earthquake of M>=4.8 within about 75 km of today's epicenter was an M 4.8 on August 27, 2011 and prior to that an M 4.8-4.9 on May 14, 2002. The last of significantly larger magnitude in the region was an M 5.2 on August 12, 1998. Forecast 119283 had expected a moderate earthquake was possible within about 25 km of today's epicenter around October 17.

 

A number of light aftershocks followed the M 4.8. An M 2.7 foreshock was also felt with intensity IV in Salinas and II-III in Soledad, San Juan Bautista, Watsonville, Santa Cruz and San Jose, California.

 

 

O: 16OCT2019 03:12:14  36.7N  121.3W Md=2.2  EMSC   CENTRAL CALIFORNIA

O: 16OCT2019 03:04:07  36.6N  121.3W Md=2.1  EMSC   CENTRAL CALIFORNIA

O: 16OCT2019 02:57:05  36.7N  121.3W Md=2.9  EMSC   CENTRAL CALIFORNIA

O: 15OCT2019 23:41:57  36.7N  121.3W Md=2.1  EMSC   CENTRAL CALIFORNIA

O: 16OCT2019 02:41:09  36.7N  121.3W Md=2.5  EMSC   CENTRAL CALIFORNIA

O: 15OCT2019 19:55:46  36.7N  121.3W Md=2.6  EMSC   CENTRAL CALIFORNIA

O: 15OCT2019 21:31:22  36.6N  121.3W Md=2.3  EMSC   CENTRAL CALIFORNIA

O: 15OCT2019 10:19:43  36.6N  121.2W Md=2.7  EMSC   CENTRAL CALIFORNIA

O: 15OCT2019 19:42:30  36.7N  121.3W Mw=4.8  EMSC   CENTRAL CALIFORNIA           

P: 17OCT2019 119283    36.5N  121.3W 2.5-4.3 AAAAA  Central California         

 

The strongest earthquake in the world today was an M 5.1 in northern Vanuatu. It was not reported felt in this area. The last earthquake within about 150 km of this epicenter with M>=5.1 was an M 6.0 on August 24, 2019. Forecast 119406 had expected this event within about 100 km was likely around October 16.

 

O: 15OCT2019 10:45:13  14.4S  166.6E mb=5.1  EMSC   VANUATU                      

P: 16OCT2019 119406    15.0S  167.0E 4.0-5.3 AAAAA  Vanuatu Islands            

 

MODERATE QUAKE SHAKES SAN FRANCISCO BAY, CALIFORNIA

 

EARTHQUAKE SUMMARY FOR OCTOBER 14, 2019

 

A moderate M 4.5 earthquake in the San Francisco Bay, California region today was widely felt in the San Francisco area. Minor damage was reported. NEIC reported more than 68,000 people reported felt effects from this earthquake. It was felt with maximum intensity V in Pleasant Hill, Concord, Walnut Creek, and IV in Lafayette, and within about 150 km of the epicenter. A series of light to moderate foreshocks and aftershocks were also lightly felt.

 

It is likely that moderate earthquakes in the area including to the south will continue for several more days. Several days ago this summary had warned of this type of activity in the San Francisco Bay area was likely in mid-October when an M 3.4 occurred in the area as:

 

"A light earthquake of M 3.4 was widely felt in the area of San Francisco Bay area of California today. NEIC reported this earthquake of M 3.3 in the San Francisco, California area  was felt with intensity II-III in the area(s) of the San Francisco, California area at San Jose, Milpitas, Livermore, Santa Clara, Fremont, Sunnyvale, Morgan Hill and in general within about 50 km of the epicenter. This continues regional seismicity which has been at enhanced levels during October. The area often sees elevated seismicity in mid-October, perhaps related to  meteorologic promoters. The Loma Prieta quake of M 7.2 on October 20, 1989 was probably triggered by strong solar flares of X10+ which occurred on the same day." (October 10-11, 2019)

 

Several days earlier a series of events in the San Francisco area was noted as follows in this summary:

 

"When a similar event of M 3.5 hit north of this on October 1, 2019 this summary noted:

 

"An unusual earthquake of M 3.5 hit off the coast of Northern California today but south of the normal seismicity in the region. Unusual earthquakes in this area can indicate a built-up stress in need of release in a larger earthquake. This is the farthest event to the west in the area 39-40N 139-142W in the past 30 years. It may be related to the energetic swarm currently occurring in the Hayward area of the San Francisco Bay region which also continued today." (October 1, 6, 2019)

 

The activity in San Francisco began several hours before local solar midnight and was probably promoted by strong tidal stresses associated with the full moon as noted in this summary in the new moon seismic forecast in previous issues:

 

"The full moon arrived on October 13 at 21:08 UT. Longitudes which were sub-solar at this time area near 45 East and 135 West longitude. These include areas of Turkey and Iran in the east and the northwestern edge of the North American Plate in the west. These are most likely to see tidal triggering at this time but tidal triggering can occur in a number of tectonic settings. Seismic enhancement is most likely a promoter of seismicity near local solar noon and local solar midnight." (October 11-14, 2019)

 

The last event in the San Francisco Bay area within about 75 km of today's epicenter which exceeded M 4.5 occurred on August 24, 2014 when an M 6.0 hit the Napa area. The last within the San Francisco Bay area was an M 5.6 more than 11 years ago on October 31, 2007. Forecasts 119065 and 119284 had expected today's event in mid-October within about 10 km of the mainshock epicenter. The activity in the San Francisco Bay area is near 103-105 degrees from the Banda Sea and Seram in Indonesia and may have been promoted by recent strong earthquakes in that area. It may also be related to regional stress redistribution following the M 7.1 in Ridgecrest, California of July 6, 2019.

 

O: 15OCT2019 05:41:45  38.0N  122.1W Md=2.1  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 15OCT2019 06:50:56  37.9N  122.1W Md=2.1  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 15OCT2019 05:23:58  37.9N  122.1W Md=2.5  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 15OCT2019 06:55:05  37.9N  122.1W Md=2.6  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 15OCT2019 05:33:42  37.9N  122.1W Mw=4.5  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 11OCT2019 119065    37.8N  122.2W 2.5-4.3 BAAAA  Central California         

P: 14OCT2019 119284    37.6N  122.5W 2.5-4.3 AAAAA  Central California         

P: 18OCT2019 119284    38.0N  122.3W 2.5-4.3 BAAAA  Central California         

 

Minutes before the San Francisco Bay quake an M 2.6-3.2 was widely felt on the south shore of Lake Erie, Ohio. NEIC reported intensity II-III in Ohio at Madison, Thompson, Perry, Geneva, Painesville, Ashtabula, Willoughby, Eastlake, Conneaut and Cleveland. The relation between these two events is not well known, but this summary has previously noted that earthquakes in the Ohio-Pennsylvania area are often followed by significant seismicity in the area of California. Several P-phases from Ohio could have been present at the epicenter in California (including PcP) at the time of the subsequent quake 8.5 minutes later. A similar event of M 2.6 in Pennsylvania followed the San Francisco quake today.  The last earthquake of M>=2.6 within about 150 km of today's epicenters occurred as an M 4.0 on June 10, 2019 but the last within the southern event in this range was an M 3.4 on June 3, 2017. Forecast 119352 had expected today's activity within about 25 km was likely around October 21.

 

O: 15OCT2019 06:58:57  40.1N   80.3W mb=2.6  EMSC   PENNSYLVANIA                 

O: 15OCT2019 05:25:09  41.7N   81.1W mb=2.6  EMSC   OHIO                         

O: 15OCT2019 05:25:09  41.8N   81.1W MB=3.2  ECAN  Lake Erie, Ohio     

P: 21OCT2019 119352    41.8N   81.4W 2.0-3.9 CAAAA  Ohio/Lake Erie             

 

The strongest earthquake in the world today was an M 5.9-6.0 in Southern Sumatra, Indonesia. NEIC reported it was felt with intensity II in Bengkulu, Indonesia. This is the strongest earthquake in Southern Sumatra within about 200 km of this epicenter since an M 6.4 on August 13, 2017. Three earthquakes of M 5.9, 5.9 and 6.1 hit about 250 km northwest of today's epicenter on February 2, 2019, the only such events since 2017.  Forecast 119233 had expected today's event was likely within about 100 km of the epicenter around October 17.

 

O: 15OCT2019 03:00:13   4.5S  101.1E mb=5.1  EMSC   SOUTHERN SUMATRA, INDONESIA

O: 15OCT2019 05:35:52   4.5S  101.2E ML=4.5  EMSC   SOUTHERN SUMATRA, INDONESIA

O: 14OCT2019 23:08:54   4.6S  101.1E ML=4.4  EMSC   SOUTHERN SUMATRA, INDONESIA

O: 14OCT2019 22:23:53   4.4S  101.3E Mw=5.9  EMSC   SOUTHERN SUMATRA, INDONESIA  

P: 17OCT2019 119233     5.0S  102.0E 4.0-5.3 BAAAA  So. of Sumatera            

 

MODERATE QUAKES IN SOUTHERN OCEANS

 

EARTHQUAKE SUMMARY FOR OCTOBER 13, 2019

 

The strongest earthquake in the world today were of M 5.2 in the Kermadec Islands, New Zealand and of M 5.1 in the Prince Edward Island region of the South Indian Ocean. Neither was reported felt in these remote areas.  The earthquake in the Prince Edward Islands region is the strongest in that area since an M 5.7 on October 23, 2015. Forecast 119204 had expected activity in the are in early October.

 

O: 13OCT2019 12:21:07  44.9S   35.0E mb=5.1  EMSC   PRINCE EDWARD ISLANDS REGION 

P:  3OCT2019 119204    51.0S   29.0E 4.0-5.4 CCCAA  Atlantic-Indian Ridge      

 

An M 6.0 occurred near the epicenter in the Kermadec Islands on September 27, 2019 and today's event is probably an aftershock of that. Forecast 119426 had expected today's event within about 100 km around October 14.

 

O: 13OCT2019 21:57:30  30.4S  177.8W mb=5.2  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 14OCT2019 119426    31.0S  177.0W 4.0-5.3 AAAAA  So. Kermadec Islands        

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the Alaska Peninsula. The last earthquakes in the Alaska Peninsula within about 150 km of this epicenter with equal or greater magnitude occurred as a series in July, 2018 and included three events of M 4.5. Forecast 119367 had expected today's event to the west was likely around October 15.

 

O: 14OCT2019 03:29:20  56.1N  156.3W Mw=4.2  EMSC   ALASKA PENINSULA             

P: 15OCT2019 119367    56.8N  159.7W 3.5-4.8 AABAA  Alaska Peninsula           

MODERATE TOKYO, JAPAN QUAKE PROMOTED BY TYPHOON HAGIBIS

 

EARTHQUAKE SUMMARY FOR OCTOBER 12, 2019

 

The strongest earthquake felt in the world today was an M 5.3 in the region southeast of Tokyo, Japan. NEIC reported it was felt with intensity IV in Chiba and II-III in Kanagawa, and Tokyo, Japan. It was probably triggered by the passage of Typhoon Hagibis near this epicenter earlier in the day. Typhoon Hagibis was deadly in Japan with more than 30 killed and hundreds injured with much property damage as this storm passed through the Tokyo region. This summary had expected enhanced seismicity in eastern Honshu with the passage of Typhoon Hagibis in previous issues as:

 

"A Super-typhoon (Hagibis) is moving up southern Japan threatening the Izu Islands and then Tokyo in the coming several days. This has been a promoter of a number of moderate earthquakes in the region of Guam and the Mariana Islands already." (October 10, 2019)

 

and

 

"Super-Typhoon Hagibis continued today in the region of the Honshu, Japan with winds up to 80 kts. It killed several and produced massive flooding in southern Honshu with much damage today. It is expected to track to the  north. Seismicity is expected to be enhanced in southern  and eastern Japan in the next week." (October 10-12, 2019)

 

The last earthquake within about 100 km of today's epicenter which exceeded magnitude M 5.3 occurred more than a year ago on July 7, 2018 with M 5.9. Earthquakes of M 5.3 have hit the area most recently on June 24, 2019; May 17, 2018 and February 19, 2017. Forecast 119082 had expected today's event was likely around October 8 but this was changed (see above) by more recent updates to around October 13.

 

O: 12OCT2019 09:21:53  34.6N  140.8E Mw=5.3  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  8OCT2019 119082    34.0N  140.0E 4.0-5.4 BAAAA  Off East Coast Honshu      

 

The strongest earthquake in the U.S. or Canada today was an M 3.8-4.1 off the coast of southeastern Alaska near Juneau, Alaska. NEIC reported this earthquake of M 3.8-4.1 in Southeastern Alaska was felt with intensity II-III in the area(s) of Elfin Cove, Alaska. The last earthquake within about 150 km of today's epicenter with M>=4.1 was an M 5.9 on September 10, 2019 with the last full moon. Today's event is probably the largest aftershock to date of that event.  Forecast 119152 had expected this activity within about 100 km was likely around October 5-11.

 

O: 12OCT2019 15:59:50  57.9N  137.8W ml=3.8  EMSC   OFF COAST OF SOUTHEASTERN ALAS

O: 12OCT2019 15:59:56  58.4N  135.9W MB=4.1  ECAN OF JUNEAU, AK                  

P:  5OCT2019 119152    59.0N  137.0W 3.0-4.4 CAAAA  Southeast Alaska           

P: 11OCT2019 119152    59.0N  139.0W 3.0-4.3 ABAAA  Southeast Alaska           

 

The strongest earthquake in the world today was an M 5.5 in the South Sandwich Islands region. It was not reported felt in this remote area. The last earthquake in the South Sandwich Islands with M>=5.5 within about 200 km of today's epicenter was an M 5.5 on June 24, 2019 and prior to that an M 5.8 on May 27, 2019. Forecast 119206 had expected today's event was likely around October 8.

 

O: 13OCT2019 06:09:01  56.4S   26.3W Mw=5.5  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  8OCT2019 119206    57.0S   25.0W 4.0-5.5 BAAAA  So. Sandwich Islands       

 

MODERATE EARTHQUAKES SOUTHEAST OF ISTANBUL, TURKEY

 

EARTHQUAKE SUMMARY FOR OCTOBER 10, 2019

 

A series of moderate earthquakes, including an M 4.0-4.2, occurred today southeast of Istanbul, Turkey. It is not a classical aftershock of the activity southwest of Istanbul which occurred September 24-26 with maximum M 5.7 on September 29. The two epicenters (today's and that of late September) may define weak spots in the Anatolian fault in the region across which a strong earthquake could occur shortly. The last event within about 100 km of today's epicenter was an M 4.2 on June 25, 2016. Forecast 119128 had expected the area would be active in early October.

 

NEIC reported these earthquakes of M 4.2 in Turkey were felt with intensity II-III in the area(s) of Turkey at Yalova and Istanbul.

 

O: 10OCT2019 16:52:03  40.7N   29.3E mb=4.0  EMSC   WESTERN TURKEY               

O: 10OCT2019 16:52:03  40.7N   29.3E mb=4.2  ANSS   WESTERN TURKEY               

P: 10OCT2019 119128    41.0N   27.0E 3.0-5.1 AABAA  Romania/NW Turkey          

P:  5OCT2019 119128    40.0N   28.0E 3.0-4.8 BAAAA  Romania/NW Turkey          

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the western Andreanof Islands, Aleutians, Alaska. It was not reported felt in this epicentral region. The last earthquake of M>=5.2 in this area within about 150 km of this epicenter was an M 5.3 and M 5.4 a month ago on September 9, 2019.  Forecast 119140 had expected today's event was likely around October 10.

 

O: 11OCT2019 01:39:24  51.3N  178.2W mb=4.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 10OCT2019 119140    51.0N  177.1W 3.5-4.9 AAAAA  Andreanoff Isls, Aleutians 

 

The strongest earthquake in the world today was an M 5.2 in the Southern Mid-Atlantic Ridge. It was not felt in this remote, oceanic area. This is the strongest earthquake within about 300 km of this epicenter since an M 5.3 a month ago on September 7, 2019 and prior to that an M 5.3 on August 2, 2015. Forecast 118986 had expected this area of the southern Mid-Atlantic Ridge would be active in early October.

 

O: 10OCT2019 21:26:26  47.0S   10.4W mb=5.2  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

P:  1OCT2019 118986    44.0S   16.0W 4.0-5.4 CCCAA  So. Mid-Atlantic Ridge     

 

 

SUPER-TYPHOON HAGIBIS EYES JAPAN

 

EARTHQUAKE SUMMARY FOR OCTOBER 9, 2019

 

Two earthquakes were felt today in the region of Tokyo, Japan. These events of

M 4.6 and 3.3 are not large by Japanese standards but are occurring within the confines of this great metropolitan complex and could be seen as important precursory phenomena. The Tokai earthquake is long overdue. A Super-typhoon (Hagibis) is moving up southern Japan threatening the Izu Islands and then Tokyo in the coming several days. This has been a promoter of a number of moderate earthquakes in the region of Guam and the Mariana Islands already. One of the most deadly earthquakes in Tokyo occurred shortly after a typhoon hit the city on September 1, 1923. This summary had described the effects of that earthquake as:

 

"The great Tokyo earthquake. This event caused up to $3 billion (U.S. Dollars) damage. More than 142,000 were killed. A tsunami was generated. This earthquake is usually referred to as the Kwanto earthquake. Up to 38,000 residents of Tokyo were burned to death in an open area where they had congregated following the earthquake for safety. The firestorm which followed th quake destroyed libraries, museums, at collections, archives and scientific data among other irreplacable structures and items. The earthquake was located in Sagami Bay southwest of Tokyo. At least 15 lines of vertical faults were found with displacement up to 6 feet. Leveling showed uplifts up to 2 meters along the Sagami Bay. The tsunami reached up to 10 meters. Many groundwater effects were observed including pulsating earthquake fountains.  More than 128,000 houses were destroyed in the quake and up to 450,000 were burned in the ensuing fire. A hotel built one year earlier with great ability to move (architect: Frank Lloyd Wright) survived with only a few cracks and was used as hospital and first aid station following the earthquake.  Building techniques in Tokyo contributed to the firestorm. These included building close to the ground and paper thin walls." (September 1, 2019)

 

Although rebuilt with strict building codes, current estimates of deaths in a similar Tokyo earthquake approach 10-100 thousand killed.

 

The last earthquake of significantly larger magnitude than M 4.5 in the Tokyo area was an M 5.0 on July 24, 2019. Earthquakes of M 4.5-4.6 hit the area on Septebmer 14 and July 28, 2019. Forecasts 119081 and 119082 had expected today's activity was likely in the Tokyo area around October 9.

 

O:  9OCT2019 08:51:24  30.0N  139.0E mb=4.6  EMSC   IZU ISLANDS, JAPAN REGION    

P:  6OCT2019 119081    31.0N  142.0E 4.0-5.3 BABAA  Off East Coast Honshu      

 

NEIC reported the earthquake of M 3.4 in Tokyo, Japan was felt with intensity II-III in the area(s) of Saitama and Tokyo, Japan.

 

O:  9OCT2019 07:48:16  35.7N  139.6E ML=3.4  EMSC   NEAR S. COAST OF HONSHU, JAPAN

P:  8OCT2019 119082    34.0N  140.0E 4.0-5.4 ABAAA  Off East Coast Honshu      

P:  9OCT2019 119082    35.0N  141.0E 4.0-5.3 AAAAA  Off East Coast Honshu      

 

O:  8OCT2019 19:58:30  35.7N  140.1E mb=4.5  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  9OCT2019 119082    35.0N  141.0E 4.0-5.3 AAAAA  Off East Coast Honshu      

 

The strongest earthquake in the world today was an M 5.4 in the Macquarie Island region south of Australia and New Zealand. This event was not reported felt in the region. It is the second event of M 5.4-5.5 in Macquarie in the past 10 days. The last event within about 200 km of this epicenter with M>=5.4 occurred on October 1, 2019 with M 5.5. The last of larger magnitude in the region was an M 5.7 on June 16, 2013.

 

O: 10OCT2019 03:18:03  58.0S  157.4E mb=5.4  EMSC   MACQUARIE ISLAND REGION      

 

A similar event of M 5.5 occurred north of New Zealand today in the area east of North Island. It was not reported felt by GEONET. This and the Macquarie Island

M 5.4 occurred at opposite ends of the seismic zone through New Zealand and may be related. The last earthquake of M>=5.5 within about 200 km of today's epicenter was an M 6.2 on May 18, 2018 and prior to that an M 5.6 on July 7, 2015.  Forecast 119198 had expected activity in this region was likely around October 6.

 

O:  9OCT2019 20:22:51  35.1S  179.2W Mw=5.5  EMSC   EAST OF NORTH ISLAND, N.Z.   

O:  9OCT2019 21:16:28  35.2S  179.1W mb=4.4  EMSC   EAST OF NORTH ISLAND, N.Z.   

P:  6OCT2019 119198    34.0S  180.0W 4.0-5.3 BBAAA  So. Kermadec Islands       

 

A light earthquake of M 3.4 was widely felt in the area of San Francisco Bay area of California today. NEIC reported this earthquake of M 3.3 in the San Francisco, California area  was felt with intensity II-III in the area(s) of the San Francisco, California area at San Jose, Milpitas, Livermore, Santa Clara, Fremont, Sunnyvale, Morgan Hill and in general within about 50 km of the epicenter. This continues regional seismicity which has been at enhanced levels during October. The area often sees elevated seismicity in mid-October, perhaps related to  meteorologic promoters. The Loma Prieta quake of M 7.2 on October 20, 1989 was probably triggered by strong solar flares of X10+ which occurred on the same day. Today's event is the strongest since an M 3.5 on October 5, 2019 and prior to that an M 4.3 on July 16, 2019. Forecast 11905 had expected today's event was likely around October 11.

 

O:  9OCT2019 09:15:16  37.4N  121.7W ML=3.4  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 11OCT2019 119065    37.8N  122.2W 2.5-4.3 AAAAA  Central California         

 

MODERATE QUAKE SHAKES HAWAII

 

EARTHQUAKE SUMMARY FOR OCTOBER 8, 2019

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in Hawaii. NEIC reported it was felt with intensity II-III in Hawaii at Naalehu, Paoa, Volcano, Mountain View, Captain Cook, Hilo, Honomu, Kailua  Kona, Laupahoehoe and Kamuela. This event is located near the Loi'hi Seamount south of the island of Hawaii. It may represent a resurgence of seismicity in this area.

It is only the second event of M>=4 south of Hawaii in the past year  an M 4.2 hit the same epicenter on August 22, 2019. Forecast 119028 had expected today's activity was likely around October 7.

 

O:  8OCT2019 13:05:17  18.9N  155.3W ML=3.6  EMSC   HAWAII REGION, HAWAII        

O:  8OCT2019 13:05:17  18.9N  155.3W ML=4.0  ANSS   HAWAII REGION, HAWAII        

P:  7OCT2019 119028    19.2N  155.1W 3.0-4.6 AAAAA  Hawaii                     

 

An unusual M 3.8 also occurred in northern Canada in Devon Island, Nunavut today. It was not reported felt in this remote area. An M 6.0 hit this epicenter on January 8, 2017 and was followed by aftershocks for about a month. Today's event is probably an aftershock of the 2017 event. No events of M>=3.8 have been recorded within about 300 km of today's epicenter since early, 2017.

 

O:  8OCT2019 21:05:08  74.3N   92.4W ML=3.8  EMSC   DEVON ISLAND, NUNAVUT, CANADA

 

The strongest earthquake in the world today was an M 5.5 in the Pacific-Antarctic region of the South Pacific. It is part of a series of ocean ridge events which have been described in the previous issue of this summary.  The last earthquake within about 300 km of this event with M>=5.5 was an M 5.9 on May 1, 2018 and prior to that an M 5.7 on July 28, 2017.

 

O:  9OCT2019 05:44:46  57.9S  139.2W Mw=5.5  EMSC   PACIFIC-ANTARCTIC RIDGE      

 

An unusually large M 4.6 occurred offshore Turkmenistan in the Caspian Sea today. NEIC reported this earthquake of M 4.6 in he Caspian Sea was felt with intensity II-III in the area(s) of the Caspian Sea at Corat Sumqayit, Azerbaijan. The last earthquake within about 200 km of this epicenter of significantly larger magnitude was an M 4.9 on January 7, 2018. Forecast 119114 had expected today's event was likely within about 100 km of today's epicenter around October 10.

 

O:  9OCT2019 03:06:29  40.7N   52.1E mb=4.6  EMSC   CASPIAN SEA, OFFSHR TURKMENIST

O:  9OCT2019 05:33:10  41.7N   49.2E ML=3.8  EMSC   CASPIAN SEA, OFFSHORE AZERBAIJ

P: 10OCT2019 119114    40.0N   52.0E 4.0-5.3 AAAAA  Kazakhstan                 

 

Moderate seismicity also continued in the Guam and Mariana region today with an

M 4.6 north of Guam. As noted in previous issues of this report this was probably promoted by the passage of Super Typhoon Hagibis as:

 

"Typhoon Hagibis formed today in the region east of Guam with winds up to 125 kts. It is expected to track to the west and north reaching Honshu, Japan around October 12. Seismicity in Guam is expected to be enhanced in the next several days as this storm moves through the region." (October 5-6, 2019)

 

Forecast 119042 had expected today's event was likely around October 7.

 

O:  8OCT2019 14:25:50  14.0N  144.6E mb=4.6  EMSC   ROTA REGION, N. MARIANA ISLAND

P:  7OCT2019 119042    14.0N  146.0E 4.0-5.3 AABAA  So. Marianas/Guam          

 

MODERATE SEISMICITY ON HIGH-LATITUDE MID-OCEAN RIDGES

 

EARTHQUAKE SUMMARY FOR OCTOBER 7, 2019

 

A series of moderate earthquakes occurred today on the world's high-latitude mid-ocean ridges. These were not reported felt in these remote areas. The strongest of these occurred in the South Shetland Islands, Reykjanes Ridge, South of Australia and in the Prince Edward Islands of the south Indian Ocean. Some, but not all of this activity had been forecast in previous issues of this summary.

 

Forecast 119201 had expected the event south of Australia within about 100 km  of that epicenter. It was nearly antipodal to the M 4.6 in the Reykjanes Ridge in the north Atlantic. That event had been expected within about 150 km of the epicenter around October 5.

 

O:  7OCT2019 14:22:11  48.9S  123.8E mb=4.8  EMSC   WESTERN INDIAN-ANTARCTIC RIDGE

P:  6OCT2019 119203    49.0S  122.0E 4.0-5.3 AABAA  So. of Australia           

 

O:  8OCT2019 04:43:49  54.5N   35.1W mb=4.6  EMSC   REYKJANES RIDGE              

P:  5OCT2019 119147    53.0N   35.0W 4.0-5.4 BBAAA  North Mid-Atlantic Ridge   

 

O:  8OCT2019 05:09:12  61.0S   53.8W mb=4.9  EMSC   SOUTH SHETLAND ISLANDS       

 

O:  7OCT2019 15:20:43  44.2S   38.9E mb=4.6  EMSC   PRINCE EDWARD ISLANDS REGION 

 

The largest earthquake reported felt in the world today was an M 4.7 in Bhutan, Asia. It is the strongest quake in Bhutan since an M 4.9 and 5.5 on July 19, 2019. It is probably a regional aftershock of the M 5.5.  NEIC reported this earthquake of M 4.7 in Bhutan  was felt with intensity II-III in the area(s) of Bhutan at Trashigang; in Gauhati, Assam, IKndia and Itanagar Arunachal Pradesh, India and in Myanmar at Myitkyina and Banmo, Kachin. Forecast 119051 had expected this event to the southeast was likely around October 11.

 

O:  7OCT2019 12:35:46  27.5N   91.4E mb=4.7  EMSC   BHUTAN                       

P: 11OCT2019 119051    26.0N   93.0E 4.0-5.3 BBBAA  Myanmar                    

 

Seismicity also continued today in the Mariana Islands where an M 4.9 occurred in the Alamagen region today. This event was probably promoted by the passage of Super Typhoon Hagibis today. This had been expected in the previous issues of this summary as:

 

 

"Typhoon Hagibis formed today in the region east of Guam with winds up to 125 kts. It is expected to track to the west and north reaching Honshu, Japan around October 12. Seismicity in Guam is expected to be enhanced in the next several days as this storm moves through the region." (October 5-6, 2019)

 

Forecast 119036 expected this activity was likely around October 9.

 

O:  7OCT2019 09:03:55  17.9N  145.8E mb=4.9  EMSC   ALAMAGAN REG, N. MARIANA ISLAN

P:  9OCT2019 119036    18.0N  148.0E 4.0-5.3 AABAA  No. Marianas               

 

The most unusual earthquake in the U.S. or Canada today occurred in northeastern Kentucky with M 2.4. It was not reported felt in this area. The last earthquake within  about 100 km of today's epicenter with M>=2.4 in eastern Kentuck occurred as an M 2.7 on January 21, 2018 and prior to that as an M 2.6 on  November 24, 2017. Forecast 119125 had expected activity in this region was likely around October 7.

 

O:  7OCT2019 09:23:04  38.2N   85.1W Md=2.4  EMSC   EASTERN KENTUCKY             

P:  7OCT2019 119125    40.0N   84.0W 2.0-3.8 ABAAA  Ohio/Lake Erie             

 

STRONG QUAKE IN NORTHERN CHILE

 

EARTHQUAKE SUMMARY FOR OCTOBER 6, 2019

 

The strongest earthquake in the world today was an M 5.9 in northern Chile in the Antofagasta region.  NEIC reported it was felt with intensity V in Calama and IV in Iquique, Tarapaca and III in Antofagasta, Chile. GUC reported this earthquake was felt with intensity   V in  Antofagasta at Maria Elena; IV Calama, III Tocopilla; and in Tarapaca with IV in Alto Hospicio, Iquique, La Tirana, Mamina, Pica, Pozo Almonte and V in El Loa with III in Huara and II in Camina, Chile. This is the first event within about 200 km of this epicenter with M>=5.9 since an M 6.3 on April 15, 2017  and an M 6.0 on June 10, 2015. An M 5.6 foreshock was widely felt about 40 km southwest of this on September 30, 2019. Forecasts 119181 and 119183 had expected this activity in early October.

 

O:  6OCT2019 10:40:55  22.0S   68.5W Mw=5.8  EMSC   ANTOFAGASTA, CHILE           

O:  6OCT2019 10:40:55  21.9S   68.6W Mw=5.9  ANSS   ANTOFAGASTA, CHILE           

O:  6OCT2019 10:40     21.9S   68.6W mb=5.5  GUC    Antofagasta at Maria Elena; IV

P:  2OCT2019 119181    22.0S   68.0W 4.0-5.4 BAAAA  Argentina                  

P:  4OCT2019 119183    23.0S   69.0W 4.0-5.3 AAAAA  Coast No. Chile            

 

The Virgin Islands in the northeastern Caribbean also saw enhanced seismicity today. Earthquakes of M 4.6 and 5.0 were felt in the area along with a series of foreshocks and aftershocks. The M 5.0 is the strongest event in the Virgin Islands since an M 5.2 on November 12, 2011. It appears to be part of the regional activation which began when hurricanes triggered an M 6.0 north of Puerto Rico in mid-September. Forecast 119030 had expected today's activity was likely around September 6. The M 5.0 occurred within about an hour of local solar noon when tidal stresses maximize.

 

NEIC reported these earthquakes of M 4.6 and M 5.0 in the Virgin Islands  were felt with intensity II-III in the area(s) of Puerto Rico at Caguas, San Juan, San Lorenzo, Dorado, Aguas Buenas and Mayaguez and in the Virgin Islands at Road Town.

 

O: 07OCT2019 01:02:13  19.5N   64.5W mb=4.6  EMSC   VIRGIN ISLANDS REGION

O: 06OCT2019 15:10:43  19.5N   64.6W Mw=4.9  EMSC   VIRGIN ISLANDS REGION

O: 06OCT2019 15:10:43  19.5N   64.6W Mw=5.0  ANSS   VIRGIN ISLANDS REGION

O: 06OCT2019 21:30:20  19.7N   64.5W Md=3.5  EMSC   VIRGIN ISLANDS REGION

O: 06OCT2019 21:04:07  19.7N   64.6W Md=3.6  EMSC   VIRGIN ISLANDS REGION

O: 06OCT2019 19:48:58  19.8N   64.7W Md=3.0  EMSC   NORTH OF THE VIRGIN ISLANDS

O: 06OCT2019 21:46:28  19.9N   64.6W Md=3.1  EMSC   NORTH OF THE VIRGIN ISLANDS

O:  6OCT2019 21:14:40  19.5N   64.5W Md=3.3  EMSC   VIRGIN ISLANDS REGION        

P:  6OCT2019 119030    19.0N   64.0W 3.0-4.8 AAAAA  Leeward Islands            

 

This pattern is consistent with tidal triggering of this activity. The anticipated seismicity with the current lunar month had been described in this summary with the new moon as:

 

"The new moon arrives at 18:26 on September 28. Longitudes at sub-solar (local solar noon) conditions are within about 20 degrees of 95 West  longitude while those at anti-solar (local solar midnight) are near 85 East longitude.  These include western South and Central America and the central U.S. in the west and central Asia and western Indonesia in the east. These are the most likely area to see significant tidal triggering within the period September 25 through October 2. Other areas are also prone to tidal stresses and a significant global event in the next week is a possibility. Tidal triggering often promotes enhanced seismicity near local solar noon or local solar midnight when such stresses maximize." (September 28-October 4, 2019)

 

Two moderate earthquakes also occurred today in Guam and the Mariana Islands.

These coincide with the passage of Super Typhoon Hagibis through the region and had been anticipated in this summary in previous issues as:

 

"Typhoon Hagibis formed today in the region east of Guam with winds up to 125 kts. It is expected to track to the west and north reaching Honshu, Japan around October 12. Seismicity in Guam is expected to be enhanced in the next several days as this storm moves through the region." (October 5-6, 2019)

 

O:  6OCT2019 17:40:46  13.1N  143.4E mb=4.9  EMSC   GUAM REGION                  

P:  6OCT2019 119036    15.0N  144.0E 4.0-5.4 ABAAA  No. Marianas               

P:  7OCT2019 119042    14.0N  146.0E 4.0-5.3 AABAA  So. Marianas/Guam          

 

O:  6OCT2019 21:21:00  20.7N  144.9E mb=4.7  EMSC   MAUG ISLANDS REG, N. MARIANA I

P:  9OCT2019 119036    18.0N  148.0E 4.0-5.3 BCCAA  No. Marianas               

 

The strongest activity in the U.S. or Canada today occurred in the region off the coast of Northern California with M 3.5 and in southeastern Alaska/Yukon, Canada also with M 3.5. These events were not reported felt in their respective epicentral areas. The last activity off the coast of northern California with M>=3.5 occurred as an M 3.7 on July 22, 2019. Forecast 119123 had expected today's epicenters would be active around October 5.

 

O:  6OCT2019 23:17:32  40.3N  124.6W ML=3.5  EMSC   OFFSHORE NORTHERN CALIFORNIA 

O:  7OCT2019 00:10:03  40.3N  124.6W ML=3.5  EMSC   OFFSHORE NORTHERN CALIFORNIA 

O:  7OCT2019 00:20:59  40.3N  124.6W Md=2.4  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P:  5OCT2019 119123    40.8N  124.9W 2.5-4.3 AAAAA  Off Coast of No. Calif     

 

The earthquake in Southeastern Alaska of M 3.5 is probably a regional aftershock of an M 5.7 which hit the area on September 10, 2019. Forecast 119152 had expected it within about 100 km was likely around October 5.

 

O:  6OCT2019 08:18:55  58.1N  137.6W ML=3.5  EMSC   SOUTHEASTERN ALASKA          

P:  5OCT2019 119152    59.0N  137.0W 3.0-4.4 AAAAA  Southeast Alaska           

 

A moderate to strong earthquake occurred in North Island, New Zealand with M 4.9-5.9. GEONET reported this earthquake was felt with moderate intensity northeast of Okahune and in southwestern North Island and northern South Island. Light to moderate intensity was reported throughout much of southern and western North Island and northern South Island. More than 2552 people reported feeling this earthquake with 1074 reports of weak intensity; 974 of light intensity; 445 with moderate intensity; 54 with strong intensity; and 2 of severe intensity and 3 of extreme shaking. NEIC reported this earthquake of M 4.9 in North Island, New Zealand  was felt with intensity II-III in the area(s) of North Island, New Zealand in Opotiki, Taneauta, Whakatane, Maketu, Katikati, Bay of Plenty; Gisborne, Napier and Hamilton and Auckland. Two earthquake of M>=4.9 have been recorded in North Island within about 100 km of this epicenter in the past year - of M 5.0-5.1 on April 27 and September 4, 2019. The last event of M>=5.9 in the area was an M 6.3-5.4 on December 7, 2012. Forecast 119196 had expected today's event within about 50 km was likely around October 5.

 

O:  7OCT2019 03:29:48  38.3S  177.4E Mw=4.9  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 07OCT2019 03:29:47  38.3S  177.3E ML=5.9  GEONET Felt with moderate intensity

P:  5OCT2019 119196    38.0S  177.0E 3.0-4.4 AAAAA  North Island, N.Z.         

 

 

LIGHT EARTHQUAKE FELT WIDELY SOUTH OF SAN FRANCISCO, CALIFORNIA

 

EARTHQUAKE SUMMARY FOR OCTOBER 5, 2019

 

An earthquake of M 3.6 was widely felt in central California south of San Francisco today. NEIC reported maximum intensity IV ni Daly City, Pacifica, San Bruno, South San Francisco, Brisbane, San Francisco and III in most areas within about 100 km of the epicenter. The last earthquake in the area within about 50 km of today's event west of 122W was an M 3.7 on July 30, 2019 and an M 4.4 on January 4, 2018 nearer today's epicenter. Forecast 119065 had expected today's event was likely in this area around October 5.

 

When a similar event of M 3.5 hit north of this on October 1, 2019 this summary noted:

 

"An unusual earthquake of M 3.5 hit off the coast of Northern California today but south of the normal seismicity in the region. Unusual earthquakes in this area can indicate a built-up stress in need of release in a larger earthquake. This is the farthest event to the west in the area 39-40N 139-142W in the past 30 years. It may be related to the energetic swarm currently occurring in the Hayward area of the San Francisco Bay region which also continued today." (October 1, 2019)

 

O:  6OCT2019 01:12:37  37.5N  121.8W MD=2.0  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O:  5OCT2019 15:41:06  37.7N  122.5W Mw=3.6  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P:  5OCT2019 119065    37.7N  121.9W 2.5-4.3 AAAAA  Central California         

 

The strongest earthquake in the world today was an M 5.1 in Eastern New Guinea. A similar M 5.2 hit the area on September 25 but the last of larger magnitude within  about 200 km of today's epicenter was an M 5.6 on July 20, 2019. Forecast 119007 had expected this event within about 100 km of this epicenter was likely around October 10.

 

O:  5OCT2019 14:28:49   6.4S  147.7E mb=5.1  EMSC   EASTERN NEW GUINEA REG., P.N.G

P: 10OCT2019 119007     7.0S  147.0E 4.0-5.3 BAAAA  New Ireland                

 

MODERATE EARTHQUAKE SHAKES CENTRAL ALASKA

 

EARTHQUAKE SUMMARY FOR OCTOBER 4, 2019

 

A moderate earthquake of M 5.0 shook areas of central Alaska today. This follows several days of abnormal quiet in the region as noted in previous issues of this report:

 

 

"There was no significant activity in the U.S. or Canada today. For the second day in a row, seismicity at the M>=3 level was absent in Alaska. This unusual quiet may indicate a seismic quiescence to be broken shortly by a moderate mainshock in the region." (October 3, 2019)

 

As this event occurred near the last events of M>=3 in Alaska, it is likely that it does indeed follow a true precursory seismic quiescense as desribed above.

 

Today's event was reported by NEIC to have been felt with maximum intensity V in the Matanuska-Sustina border of Alaska and II-III within about 200 km of the epicenter at Talkeetna, Willow, Wasilla, Chugiak, Elmendorf AFB, Anchorage.

This event of M 5.0 is the strongest within about 150 km of this epicenter in Central Alaska since an M 5.0 on July 10, 2018 - the last of larger magntiude was an M 5.2 on January 31, 2017. Today's event is about 150 km northwest of the M 7.1 quake that shook Alaska on November 30, 2018 and may be a regional aftershock of that event. Forecast 119157 had expected today's epicenter would be active within about 50 km around October 5. This epicenter is located at 103 degrees from the M 6.8 in Sumatra of August 2, 2019 the strongest earthquake in the past two months in the world and was likely promoted by energy from that source.

 

O:  4OCT2019 12:28:00  62.5N  151.5W Mw=5.0  EMSC   CENTRAL ALASKA               

P:  5OCT2019 119157    62.8N  151.2W 3.2-4.8 AAAAA  Central Alaska             

 

The strongest earthquake in the U.S. or Canada today was not, however the event in Central Alaska. Instead it was an M 5.1 in the Rat Islands, Aleutians, Alaska. This event was not reported felt in this remote area. The last earthquake in the Rat Islands region with equal or greater magnitude was an M 5.3 on April 14, 2019 - an aftershock of the M 6.4 which hit the region on April 2, 2019. Today's event is also a likely aftershock of that April quake.  Forecast 119149 had expected this activity in the Rat Islands was likely within about 100 km around October 7.

 

O:  5OCT2019 03:48:15  52.0N  178.1E mb=5.1  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P:  7OCT2019 119149    51.0N  178.0E 4.0-5.6 AAAAA  Rat Islands                

 

Two earthquakes of M 4.0-4.1 occurred in Puerto Rico and the Dominican Republic today continuing elevated seismicity in the area which began with the passage of several hurricanes through the region last month. These were accompanied by an M 6.0 in Puerto Rico on September 24, the strongest in that area in since January 13, 2014. NEIC reported the earthquake of M 4.0 in Puerto Rico  was felt with intensity II-III in the area(s) of Gurabo, Puerto Rico. Forecasts 119043 had expected this activity in Puerto Rico and the Dominican Republic was likely around October 5-7. A M 4.1 last occurred in the series on September 27 with M 4.7.

 

O: 04OCT2019 21:50:16  19.4N   69.9W ML=4.0  EMSC   DOMINICAN REPUBLIC

O: 04OCT2019 10:13:46  19.6N   68.6W ML=3.2  EMSC   DOMINICAN REPUBLIC REGION

O:  5OCT2019 05:32:52  18.8N   71.5W ML=3.0  EMSC   DOMINICAN REPUBLIC            

P:  7OCT2019 119043    18.0N   72.0W 3.0-4.4 AAAAA  Bahamas/No. Caribbean      

 

O: 04OCT2019 07:47:18  19.0N   67.3W mb=4.1  EMSC   PUERTO RICO REGION

O: 05OCT2019 00:11:51  19.1N   67.2W ML=3.4  EMSC   PUERTO RICO REGION

O: 05OCT2019 00:04:31  19.1N   67.3W Md=3.0  EMSC   PUERTO RICO REGION

O: 04OCT2019 15:16:21  19.2N   67.2W Md=3.2  EMSC   PUERTO RICO REGION

O: 04OCT2019 10:55:39  19.2N   67.3W Md=3.1  EMSC   PUERTO RICO REGION

O: 05OCT2019 04:48:31  19.2N   67.7W Md=3.1  EMSC   PUERTO RICO REGION

O: 04OCT2019 22:13:13  19.3N   67.3W Md=3.0  EMSC   PUERTO RICO REGION

O:  5OCT2019 06:42:25  19.0N   67.3W Mw=3.7  EMSC   PUERTO RICO REGION           

P:  5OCT2019 119043    20.0N   68.0W 3.0-4.3 AAAAA  Bahamas/No. Caribbean      

 

 

MODERATE QUAKE SHAKES EASTERN NEW GUINEA

 

EARTHQUAKE SUMMARY FOR OCTOBER 3, 2019

 

The strongest earthquake in the world today was an M 5.5 in eastern Papua New Guinea. It was not reported felt in this area. Strong to major earthquakes near this epicenter are located at 103 degrees from the area of Los Angeles, California and have been previously associated in this summary with major increases in regional seismicity in that area about a month later. But earthquakes of M 5.5 in eastern New Guinea do not have a significant effect of California seismicity due to the limited energy produced in the event. At most an enhancement of about 0.2-0.3 magnitude units may be expected for maximum earthquakes in the Los Angeles area at the end of October and early November, 2019.    While an M 6.3 hit this region of Indonesia half a month before the M 7.1 in Ridgecrest of July 6, 2019, the last of M>=5.5 in the area was an M 5.6 on July 8, 2019. Forecast 119017 had expected today's event was likely around October 9. Some seismic enhancement in the Ridgecrest, California aftershock zone may occur in the next several days.

 

NEIC reported an aftershock of M 4.7 in Seram, Indonesia was felt with intensity II-III in the area(s) of Ambon, Indonesia. Today's activity is at 103 degrees from the Ridgecrest, California event of July 6 and was probably promoted from that source.

 

O: 03OCT2019 14:33:08   2.7S  138.3E Mw=5.5  EMSC   PAPUA, INDONESIA

O: 03OCT2019 18:26:11   2.7S  138.7E mb=4.3  EMSC   PAPUA, INDONESIA

O: 03OCT2019 21:12:25   2.8S  138.5E mb=4.7  EMSC   PAPUA, INDONESIA

O: 03OCT2019 08:41:19   3.7S  128.5E mb=4.7  EMSC   SERAM, INDONESIA

O:  3OCT2019 17:49:48   1.9S  138.6E ML=4.3  EMSC   NEAR N COAST OF PAPUA, INDONES

P:  9OCT2019 119017     3.0S  138.0E 4.0-5.3 CAAAA  West Irian, PNG            

 

Seismicity in the U.S. and Canada today remained at quiet levels. The strongest event was an M 3.2 in Central Alaska. In the previous issue of this summary it had been noted in this regard:

 

"There was no significant activity in the U.S. or Canada today. For the second day in a row, seismicity at the M>=3 level was absent in Alaska. This unusual quiet may indicate a seismic quiescence to be broken shortly by a moderate mainshock in the region." (October 3, 2019)

 

The last earthquake within about 100 km of today's epicenter in Central Alaska with M>=3.2 occurred on September 30, 2019 with M 3.8.  Forecast 119157 had expected today's event around October 8 in this area.

 

O:  3OCT2019 16:57:21  62.3N  148.2W ML=3.2  EMSC   CENTRAL ALASKA               

P:  8OCT2019 119157    62.9N  148.8W 3.2-4.8 BAAAA  Central Alaska             

 

 

MODERATE QUAKE SHAKES OAXACA, MEXICO

 

EARTHQUAKE SUMMARY FOR OCTOBER 2, 2019

 

The strongest earthquake in the world today was an M 5.2 in the area south of Oaxaca, Mexico. NEIC reported this earthquake of M 5.2 in Oaxaca, Mexico  was felt with intensity II-III in the area(s) of Xadani, Huatulco, Villahermosa, Momoxpan, Mexico City, Naucalpan, Tlalnepantla and Morelia and V in Santa Cruz, Oaxaca. It was accompanied by more than 10 moderate aftershocks but no damage or casualties were reported. This is an active zone following a great earthquake earthquake on September 8, 2017 of M 8.1 to the east in Chiapas, Mexico. The last event within about 150 km of this epicenter with M>=5.2 occurred on July 12, 2019 of M 5.2 and an M 5.8 on January 21, 2019 of M 5.8.   Forecast 118820 had expected today's event was likely around October 1.

 

O: 02OCT2019 12:57:09  15.2N   94.5W ML=4.1  EMSC   OFF COAST OF OAXACA, MEXICO

O: 03OCT2019 02:09:14  15.4N   94.8W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO

O: 03OCT2019 04:36:09  15.7N   94.9W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 02OCT2019 14:18:29  15.7N   95.1W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 03OCT2019 01:43:47  15.7N   95.1W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 02OCT2019 20:42:07  15.7N   95.1W ML=4.2  EMSC   OFFSHORE OAXACA, MEXICO

O: 02OCT2019 20:11:50  15.7N   95.3W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 02OCT2019 10:07:14  15.8N   95.0W mb=4.1  EMSC   OFFSHORE OAXACA, MEXICO

O: 02OCT2019 10:13:10  15.9N   95.0W Mw=5.2  EMSC   OFFSHORE OAXACA, MEXICO

O:  2OCT2019 09:49:40  14.6N   92.7W ML=4.0  EMSC   OFFSHORE CHIAPAS, MEXICO     

P:  1OCT2019 118820    16.0N   93.0W 3.5-5.0 ABAAA  Chiapas, Mexico            

 

A moderate M 5.1 occurred near the Dodecanese Islands, Greece and Turkey today. This continues elevated seismicity in the region which included an M 5.9 south of Istanbul, Turkey last week. NEIC reported this earthquake of M 5.1 in the Dodecanese Islands  was felt with intensity II-III in the area(s) of the Dodecanese Islands, Greece at Kalithiai, Falirakion, Koshinou, Sgourou, Afantou, Rodos, Ialisos, Arkhangelos, Kremasti and Lardos. This is the strongest earthquake within about 200 km of this epicenter since an M 5.8 on August 8, 2019. A foreshock to today's event was an M 5.3 on January 24, 2019 about 50 km southwest of today's epicenter. Forecast 119100 had expected today's event in this region was likely around October 5.

 

 

O:  3OCT2019 04:44:56  36.2N   28.6E Mw=5.1  EMSC   DODECANESE IS.-TURKEY BORDER R

P:  5OCT2019 119100    35.0N   28.0E 3.5-4.9 AAAAA  Turkey                     

 

A pair of moderate earthquakes occurred today in the South Sandwich Islands region with M 4.9 and 5.1. They were not reported felt in this remote area. The South Sandwich Islands often see enhanced seismicity following strong geomagnetic storms such as the one which concluded today. The M 5.1 was in a somewhat unusual epicenter to the west of the normal regional seismicity which in recent years has occurred about 250 km northeast of today's epicenter near 55 South latitude. The last earthquake of M>=5.1 within about 200 km of today's event occurred more than 10 years ago on August 28, 2008. Forecast 119206 had expected the South Sandwich Islands would be active in early October.

 

O:  3OCT2019 01:55:09  56.3S   27.6W mb=4.9  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  8OCT2019 119206    57.0S   25.0W 4.0-5.5 BABAA  So. Sandwich Islands       

 

O:  3OCT2019 01:11:43  57.1S   30.5W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  8OCT2019 119206    57.0S   25.0W 4.0-5.5 BACAA  So. Sandwich Islands       

 

A series of moderate earthquakes also occurred around Honshu, Japan today.

Two of these - an M 4.4 and 4.7 near the northeastern tip of Honshu were notable

as possibly outer rise earthquakes indicating a strong quake is possible to the east of these epicenter in the near term. An M 4.8 hit the same area earlier on October 2, 2019 (see previous summary). These are the farthest east of event of M>=4.7 in the region since an M 4.8 on June 13, 2019. Forecast 119083 had expected this activity around October 4.

 

O:  3OCT2019 03:55:42  39.9N  143.5E mb=4.7  EMSC   OFF EAST COAST OF HONSHU, JAPA

O:  2OCT2019 14:54:23  39.9N  143.6E mb=4.4  EMSC   OFF EAST COAST OF HONSHU, JAPA

P:  4OCT2019 119083    38.0N  142.0E 4.0-5.3 ABAAA  Off East Coast Honshu      

 

There was no significant activity in the U.S. or Canada today. For the second day in a row, seismicity at the M>=3 level was absent in Alaska. This unusual quiet may indicate a seismic quiescence to be broken shortly by a moderate mainshock in the region.

 

MODERATE QUAKE IN MACQUARIE ISLAND AREA

 

EARTHQUAKE SUMMARY FOR OCTOBER 1, 2019

 

The strongest earthquake in the world today was an M 5.5 in the Macquarie Island region south of New Zealand and Australia. It was not reported felt in this remote area. This is the strongest event in the Macquarie Island area within about 250 km of this epicenter since an M 5.8 on March 1, 2019 and an M 6.1 on September 8, 2016.

 

O:  1OCT2019 19:57:11  55.3S  158.6E Mw=5.5  EMSC   MACQUARIE ISLAND REGION      

 

The largest earthquake in the U.S. or Canada today occurred as an M 4.2 in the

Unimak Island region, Alaska. It was not reported felt in this remote area east of the Fox Islands. The last earthquake in the Unimak Island area within about 150 km with M>=4.2 occurred as an M 4.7 on March 7, 2019. Earthquakes about 150 km to the west occurred as an M 4.8 on September 27, and as an M 5.4 on September 14, 2019. Forecast 118940 had expected this earthquake was likely within about 25 km of the epicenter around September 26.

 

O:  1OCT2019 09:15:46  54.2N  164.8W mb=4.2  EMSC   UNIMAK ISLAND REGION, ALASKA 

P: 26SEP2019 118940    54.2N  165.0W 3.5-4.8 BAAAA  Unimak Islands, Aleutians  

MODERATE QUAKES IN TAIWAN COINCIDENT WITH TYPHOON MITAG

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 30, 2019

 

A series of moderate earthquakes hit Taiwan today as Typhoon Mitag passed through the region. Minor damage was reported from Mitag and a bridge collapsed, but may not have been related to the storm or earthquakes. This summary had expected this activity in Taiwan at this time with Mitag as:

 

"Typhoon Mitag (19W) continued today over Taiwan with winds up to 80 kts. It is expected to track to the north and east over the next several days reaching areas east of Taiwan around September 30 and Kyushu October 2. The area is likely to see enhanced seismicity during this period, especially if 19W expands to typhoon levels. Today's M 6.0 in the Mindanao area of the Philippines may have been promoted from TS Mitag." (September 29-30, 2019)

 

CWB reported the M 4.4 was felt with intensity IV in Kaohsiung, Pingtung; II in Tainan, Chiayi, Yunlin and I in Taitung and Changhua Counties, Taiwan. CWB reported the M 4.0 was felt with intensity II in Kaohsiung, Pingtung; II in Tainan, and I in Chiayi, Yunlin Counties, Taiwan. CWB reported the M 4.2 was felt with intensity III in  Pingtung; II in Tainan, and Kaohsiung and I in Chiayi, Yunlin, Taitung, and Hualien Counties, Taiwan. CWB reported the M 4.3 was felt with intensity II in Taitung and I in Pingtung and Hualien Counties, Taiwan. Forecast 118848 had expected this activity in Taiwan was likely around September 29-30.

 

O: 01OCT2019 02:17:49  22.6N  121.0E ML=4.3  TAI    Hualien, Taiwan              

O: 30SEP2019 10:38:03  22.9N  120.6E ML=4.0  TAI    Hualien, Taiwan              

O: 01OCT2019 02:17:49  22.6N  121.2E mb=4.4  EMSC   TAIWAN REGION

O: 30SEP2019 17:12:58  22.9N  120.6E ML=4.4  EMSC   TAIWAN

O: 30SEP2019 17:12:58  22.9N  120.6E ML=4.4  TAI    Hualien, Taiwan              

O: 30SEP2019 18:42:55  22.9N  120.6E ML=4.2  TAI    Hualien, Taiwan              

P: 29SEP2019 118848    23.0N  122.0E 4.0-5.3 AAAAA  Taiwan                     

P: 30SEP2019 118848    24.0N  121.0E 4.0-5.3 BAAAA  Taiwan                     

 

The strongest earthquake felt in the world today was an M 5.6 in northern Chile. NEIC reported it was felt with intensity IV in Calama, Antofagasta and II in Iquique, Tarapaca, Chile. GUC reported this earthquake was felt with intensity  V in  Antofagasta at Calama, Tocopilla; IV in Antofagasta, Maria Elena and Sierra Gorda and III in San Pedro de Atacama and in Tarapaca with III in Alto Hospicio, El Loa, Iquique and Pica and II in Huara, Chile. This may be a regional aftershock of the M 6.8 in Central Chile south of this that occurred on September 29. It is the strongest event within about 200 km of this epicenter in northern Chile since an M 5.6 on April 5, 2018. The last event in the area of larger magnitude was an M 6.3 on April 15, 2017. Forecast 118966 had expected this event was likely around September 27.

 

O: 30SEP2019 11:53:21  22.2S   68.6W Mw=5.6  EMSC   ANTOFAGASTA, CHILE           

O: 30SEP2019 11:53     22.2S   68.8W mb=5.6  GUC    Antofagasta at Calama, Tocopil

P: 27SEP2019 118966    22.0S   67.0W 4.0-5.6 BABAA  Argentina                  

 

The strongest unfelt earthquake today was an M 5.9 in the Southern Pacific Rise. This is the strongest earthquake within about 250 km of this epicenter in the southern  East Pacific Rise since an M 6.3 on November 15, 2018 and before that an M 5.9 on August 18, 2016.

 

O:  1OCT2019 03:56:06  56.0S  122.5W Mw=5.9  EMSC   SOUTHERN EAST PACIFIC RISE   

 

An earthquake of M 6.0 off North Island, New Zealand was also reported by GEONET today. GEONET reported the M 6.0 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 3314 people reported feeling this earthquake with 1268 reports of weak intensity; 1419 of light intensity; 529 with moderate intensity; 90 with strong intensity; and 3 of severe intensity and 5 with extreme intensity. NEIC reported this earthquake of M 5.3 off North Island, New Zealand  was felt with intensity II-III in the area(s) of Nuhaka (V), Hawke's Bay, Napier, Hastings, Opotiki Bay of Blenty, Waipukurau, Whakatane, Kaweru, and Rotorua North Island, New Zealand. The last earthquake of M>=6 within about 200 km of this epicenter occurred on January 20, 2014 with M 6.2 and prior to that on December 7, 2012 with M 6.4. Forecast 118984 had expected regional seismicity around September 29.

 

O:  1OCT2019 05:16:38  39.3S  177.8E mb=5.3  EMSC   OFF E. COAST OF N. ISLAND, N.Z

O: 01OCT2019 00:56:45  39.1S  177.8E MS=6.0  GEONET Felt with light intensity

P: 29SEP2019 118984    40.0S  175.0E 3.0-4.3 AABAA  North Island, N.Z.         

 

The largest earthquake in the U.S. or Canada today was an M 4.0 in western Texas. NEIC reported it was felt with intensity II-III in Texas at Snyder, Fluvanna, Hermleigh, Post, Jayton, Aspermont, Spur, Dickens, Lamesa and Lubbock.

This is not part of the typical seismicity in western Texas which has in recent months been occurring to the southwest of today's epicenter. The last event within about 100 km of today's epicenter with M>=4 occurred as an M 4.5 on September 11, 2011, the only such event in the past 30 years. Forecast 118878 had expected this activity was likely around the end of September.

 

O: 30SEP2019 21:47:12  32.9N  100.9W Mw=4.0  EMSC   WESTERN TEXAS                

P: 25SEP2019 118878    31.4N  103.8W 2.0-3.9 BBBAA  SW U.S.A                   

 

An unusual earthquake of M 3.5 hit off the coast of Northern California today but south of the normal seismicity in the region. Unusual earthquakes in this\ area can indicate a built-up stress in need of release in a larger earthquake. This is the farthest event to the west in the area 39-40N 139-142W in the past 30 years. It may be related to the energetic swarm currently occurring in the Hayward area of the San Francisco Bay region which also continued today. Forecast 118856 had expected activity in this region of northern  California was likely at the end of September.

 

NEIC reported this earthquake of M 3.5 off the coast of northern California  was felt with intensity II-III in the area(s) off the coast of northern California in Caspar, Westport, Fort Bragg, Mendocino, Littleriver, Albion, Comptche, Willits.

 

O:  1OCT2019 00:09:05  39.5N  124.0W ML=3.5  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 29SEP2019 118856    39.8N  123.5W 2.5-4.3 AAAAA  Central California         

 

ANOTHER NEW MOON; ANOTHER MAJOR QUAKE IN CENTRAL CHILE

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 29, 2019

 

A strong M 6.8 earthquake in central Chile occurred within an hour of local solar noon today suggesting a promotion from tidal stresses associated with the new moon which maximized at this hour. NEIC reported maximum intensity VI in Chile at Constitucion, Maule; V in Linares, Concepcion, Biobio; IV in Cauquenes, Talca, Penco and Chillan and III in San Javier and Parrat, among many others in central Chile in Maule and Biobio. A series of felt moderate aftershocks also occurred. GUC reported this event was felt with intensity  III in  Santiago at Buin, Colina, El Monte, Lampa,Melipilla, San Jose de Maipo, San Pedro; II in Paine, San Bernardo, Santiago; V in O'Higgins a Chimbarongo, Navidada, IV in Litueche, Machali, Mostazal, Paredones, Pichilenu, Rengo, Quinto de Tilcoco, Rancagua, San Fernando, Santa Cruz, III in Las Cabras, Marchihue, in Maule with VI in Cauquenes, Longavi,; V in Constitucion, Linares, San Javier, Talca, Vichuquen; IV in Curico, Longavi, Pelluhue,  Nuble with V in San Favian, Coihueco, Pinto,m San Carlos, San Nicolas; IV in Coelemu, Chillan, Quillon; in Biobio with V in Arauco, Chiguayante, Concepcion, Florida, Jualpen, Los Angeles, Mulchen, Penco, San Pedro de la Paz, Santa Juana, Talcahuano, Tirua and IV in Laja and Lebu; in La Araucania with IV in Angol, Carahue, Cholchol, Collipulli, Curacautin, Los Sauces, Oadre las Caseas and Pitrufquen and III in Gorbea and Nueva Imperial, Chile. Many moderate aftershocks were felt in the area. There was no major damage or tsunami reported with this earthquake. This appears to be a repeat of the last major global event - in the same area of Chile on August 2, 2019 with M 6.8. This summary had most recently reminded readers of the August 2, 2019 event two days ago on September 27 as:

 

"The strongest earthquake in the world today was an M 6.1 in south-central Chile in the Los Lagos area. NEIC reported it was felt with intensity IV in Los Lagas at Rio Bueno, Parranque, Osomo and Puerto Monhff and II-III in Puerto Varas, La Union, Panguipulli, Validvia and Villarrica, Chile and in Barioche Rio Negro, Argentina. The area along the coast of South America has been unusually quiet over the past three months. A solar eclipse was visible in this region of Chile in early July, 2019. This summary had expected the possibility of a major quake in the eclipse area at the time. This was delayed and eventually occurred as an M 6.8 on August 1, 2019 at the epicenter which saw the greatest eclipse a month earlier - also with the new moon.

 

As with the earthquake near Istanbul, Turkey, today's event in Chile occurred within about an hour of local solar noon and was likely enhanced by tidal stresses. It is the strongest earthquake in the central South American coastline since the M 6.8 of August 1, the last earthquake in the world of that size or greater (Sumatra also saw an M 6.8 on August 2). Three events of M>=5.3 have hit the general area from Los Lagos to Coquimbo in the past three days however, so the stored seismic energy during this quiet period appears to be in the process of being released. These include an M 5.4 today in Coquimbo, Chile and an M 5.3 in Biobio, Chile on September 23, 1999." (September 26-27, 2019)

 

As the event today and of August 2 are nearly identical it is instructive to repeat our summary in this regard which appeared on August 2, 2019 as:

 

"An earthquake of M 6.8 hit the region off the coast of O'Higgins, Central Chile today. It follows a month-long strong seismic quiet period (quiescence) which was recognized in previous issues of this report. As it occurred on the day of the new moon within about an hour of local solar noon, a time when tidal stresses maximize, it was probably promoted at this time by tidal stresses. This summary had expected a major earthquake in this area at this time beginning in early July, 2019 as:

 

 

"The new moon will arrive on July 2 at 19:16 UT. Longitudinal areas most likely to see high tidal stresses with this event are near 80 East and 100 West. These areas include central Asia in the east and the central U.S. in the West (including the central Plaines states where tidal triggering is common).

This new moon will include a solar eclipse. It will be visible over Central Chile and Argentina near 34S 68-75W and into the Pacific Ocean. A strong event in Central Chile is possible as this eclipse passes. The timing of the eclipse is maximized about 20:00 UT.  A strong regional event in this active area could occur in the next four days. While these will experience the maximum tidal stress many other areas could also see enhanced seismicity in the next week." (July 1-2, 2019)

 

and

 

"A solar eclipse will be seen today in the region of southern Pacific Ocean, West Chile Rise, East Pacific Rise and Central Chile. Solar eclipses have been known to be associated with major events in South America in the past. For example, a total solar eclipse of June 21, 2001 which began over South America was accompanied by  an M 8.4 in Peru on June 23, 2001, a quake which devastated the area and killed thousands. The coincidence of these two events was probably not happenstance. A further example is the Izmit, Turkey event of August 1999  which coincided with the most complete solar eclipse in Europe in centuries. Because this is a high southern latitude event, other areas at high southern latitudes could also see enhanced seismicity in the next several days." (July 2, 2019)

 

Later this summary noted the strange seismic behavior in Central Chile as:

 

"What happened in Central Chile? This summary had expected the possibility of a strong quake in that region near the time of the solar eclipse and new moon of July 2 as:

 

Instead what occurred was the M 7.1 and 6.4 in Southern and Central California at the same distance north of the equator as this area of Chile is south of the equator. This region of Chile, however, does appear to have been strongly affected by the conditions associated with the solar eclipse, but not be seismic enhance but by seismic quiescence. A strong quiet period in this region of Chile began with the eclipse and continues to this day. No moderate earthquakes have been recorded in this region since the eclipse, highly unusual for this active area. The stresses appear to have dampened regional seismicity. If a strong quake should occur in early July, it is now expected near the time of the full moon near July 16." (July 7, 2019)

 

NEIC reported the mainshock at M 6.8 was felt with maximum intensity VI in Constitucion, Maule, Chile and V in San Fernando, O'Higgins. Intensity IV was reported within about 150 km of the epicenter in Valparaiso, O'Higgins, Santiage, and Maule, Chile. Aftershocks were common and included an M 5.8 and 5.4 felt with intensity III in Valparaiso, O'Higgins, and Santiago, Chile.

CSN reported this event of 6.6 with intensity up to   VII. It was reported felt with maximum intensity V in Casablanca, Coquimbo, VI in Melipilla, San Jose de Maipo, San Pedro, Tiltil,  and Puente Alto, Santiago, VI in O'Higgins at Chimbarongo, Marchihue, Navidad, Paredones, Pichilemu, San Fernando, San Vicente de Tagua, V in Maule at Colbun, Constitucion, Curico, VI in Empedrado, Hualane and Llico, and Talca, IV in Biobio at Talcahuano and Tome and IV in La Araucania at Angol, Carahue and Panguipulli, Chile. The last earthquake within about 250 km of today's 6.8 in Central Chile occurred was an M 6.8-6.9 on April 24, 2017. The only events in the region of larger magnitude in the past 30 years were of M 7.0-7.1 on March 25, 2012 and March 11, 2010." (August 1-2, 2019)

 

The tidal forecast with the current new moon in this summary had read – note the reference to triggering along the coast of South America:

 

 

"The new moon arrives at 18:26 on September 28. Longitudes at sub-solar (local solar noon) conditions are within about 20 degrees of 95 West  longitude while those at anti-solar (local solar midnight) are near 85 East longitude.  These include western South and Central America and the central U.S. in the west and central Asia and western Indonesia in the east. These are the most likely area to see significant tidal triggering within the period September 25 through October 2. Other areas are also prone to tidal stresses and a significant global event in the next week is a possibility. Tidal triggering often promotes enhanced seismicity near local solar noon or local solar midnight when such stresses maximize." (September 25-27, 2019)

 

Forecast 118977 had expected today's event within about 50 km was likely around

September 28. That this series of events in Chile have been intimately associated with the last three new moons following the new moon and eclipse of early July, it is hard to not attribute some of this activity to tidal stresses associated with these alignments. Today's epicenter is also located at 144 degrees from Mindanao where an M 6.2 occurred yesterday and may have been promoted by energy from that source.

 

O: 29SEP2019 17:48:11  35.4S   73.3W mb=4.4  EMSC   OFFSHORE MAULE, CHILE

O: 29SEP2019 15:57:56  35.5S   72.9W Mw=6.8  EMSC   OFFSHORE MAULE, CHILE

O: 29SEP2019 15:57     35.5S   73.2W mb=6.6  GUC    Santiago at Buin, Colina, El M

O: 29SEP2019 20:11:58  35.5S   72.9W mb=5.3  EMSC   OFFSHORE MAULE, CHILE

O: 29SEP2019 21:04:33  35.5S   73.0W ML=4.0  EMSC   OFFSHORE MAULE, CHILE

O: 30SEP2019 04:49:34  35.5S   73.0W mb=4.7  EMSC   OFFSHORE MAULE, CHILE

O: 29SEP2019 18:45:58  35.5S   73.2W mb=4.4  EMSC   OFFSHORE MAULE, CHILE

O: 29SEP2019 16:39:55  35.5S   73.2W mb=4.7  EMSC   OFFSHORE MAULE, CHILE

O: 29SEP2019 16:21:35  35.4S   73.1W ML=4.2  EMSC   OFFSHORE MAULE, CHILE        

P: 28SEP2019 118977    36.0S   73.0W 4.0-5.3 AAAAA  Central Chile              

 

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 Valdez,  Central Alaska and II-III in the area(s) of Central Alaska at Chugiak, Wasilla and Eagle River.  The last earthquake of M>=4.1 within about 150 km of this epicenter occurred on October 16, 2018 with M 4.3 and prior to that an M 4.3 on May 29, 2018. Forecast 118945 had expected today's event within about 100 km of the epicenter was likely at the end of September or early October.

 

O: 30SEP2019 01:20:26  62.2N  147.8W mb=4.1  EMSC   CENTRAL ALASKA               

P:  1OCT2019 118945    61.0N  147.7W 3.2-4.8 ABAAA  Central Alaska             

 

STRONG EARTHQUAKE IN MINDANAO, PHILIPPINES RELATED TO WEATHER, GEOMAGNETICS

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 28, 2019

 

The strongest earthquake in the world today was an M 6.2 in Southern Mindanao, Philippines. NEIC reported it was felt wtih intensity V in Conel, Southern Mindanao; IV in Pindaguitan, Buayan, San Jose, Balutakay, Sulit and Davao and with lesser shaking at Digos, Tibanban and Dahican, Southern Mindanao, Philippines. The epicenter on the geomagnetic equator was probably promoted to a stronger event by the current geomagnetic storm, the strongset in  nearly a month. Tidal triggering from the new moon is also a possibility. The tidal forecast for seismicity read:

 

"The new moon arrives at 18:26 on September 28. Longitudes at sub-solar (local solar noon) conditions are within about 20 degrees of 95 West  longitude while those at anti-solar (local solar midnight) are near 85 East longitude.  These include western South and Central America and the central U.S. in the west and central Asia and western Indonesia in the east. These are the most likely area to see significant tidal triggering within the period September 25 through October 2. Other areas are also prone to tidal stresses and a significant global event in the next week is a possibility. Tidal triggering often promotes enhanced seismicity near local solar noon or local solar midnight when such stresses maximize." (September 25-27, 2019)

 

Another factor probably adding to the stress on Mindanao at this time was Tropical Storm Mitag which mad landfall in the Philippines today. This summary had noted in this regard:

 

"Tropical Storm Mitag (19W) continued today over northern Philippines with winds up to 70 kts. It is expected to track to the north and east over the next several days reaching areas east of Taiwan around September 30 and Kyushu October 2. The area is likely to see enhanced seismicity during this period, especially if 19W expands to typhoon levels. Today's M 6.0 in the Mindanao area of the Philippines may have been promoted from TS Mitag." (September 27-28, 2019)

 

Today's earthquake of M 6.2 was the largest within about 200 km of this epicenter in Mindanao, Philippines since an M 7.0 on December 29, 2018 and prior to that an M 6.2 more than a year ago on September 8, 2018. Two such earthquakes also  hit the area between 2015 an the 2018 event in September. Forecast 118797 had expected today's event was likely around September 28. This earthquake is located at 145 degrees from the M 6.8 in Central Chile of August 1, 2019 and was probably enhanced by strong concentrated energy from that event. That area has been active in recent days as documented in  this summary and further strong quakes in Central are likely in coming days.

 

O: 29SEP2019 03:08:58   5.0N  126.6E ML=4.2  EMSC   MINDANAO, PHILIPPINES

O: 29SEP2019 04:19:23   5.5N  126.6E ML=4.4  EMSC   MINDANAO, PHILIPPINES

O: 29SEP2019 03:12:12   5.5N  126.6E ML=4.5  EMSC   MINDANAO, PHILIPPINES

O: 29SEP2019 02:02:52   5.7N  126.6E Mw=6.2  EMSC   MINDANAO, PHILIPPINES        

P: 28SEP2019 118797     5.0N  127.0E 4.0-5.3 AAAAA  Halmahera                  

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 in Central Alaska. This is the strongest earthquake within about 150 km of this epicenter since an M 4.3 on April 18, 2014. Forecast 118945 had expected regional activity around the first of October.

 

O: 29SEP2019 06:59:22  63.3N  145.5W ML=3.7  EMSC   CENTRAL ALASKA               

P:  1OCT2019 118945    61.0N  147.7W 3.2-4.8 ABAAA  Central Alaska             

P: 21SEP2019 118742    62.9N  143.9W 3.2-4.9 CAAAA  Central Alaska             

 

A strong swarm occurred in the Virgin Islands today. At least 13 events of M 3.1-3.6 were recorded in this area today. This activity may have been promoted by the recent passage of hurricanes, including Jerry, and Karen through this region. Forecast 118826 expected this activity was likely towards the end of September.

 

O: 28SEP2019 17:47:19  18.9N   64.7W Md=3.4  EMSC   VIRGIN ISLANDS REGION

O: 28SEP2019 15:28:24  19.0N   64.8W Md=3.4  EMSC   VIRGIN ISLANDS REGION

O: 28SEP2019 16:48:10  19.1N   64.7W ML=3.1  EMSC   VIRGIN ISLANDS REGION

O: 28SEP2019 18:14:26  19.1N   64.7W Md=3.4  EMSC   VIRGIN ISLANDS REGION

O: 28SEP2019 18:12:11  19.2N   64.7W ML=3.4  EMSC   VIRGIN ISLANDS REGION

O: 28SEP2019 17:42:25  19.2N   64.7W Md=3.3  EMSC   VIRGIN ISLANDS REGION

O: 28SEP2019 17:55:46  19.2N   64.7W Md=3.5  EMSC   VIRGIN ISLANDS REGION

O: 28SEP2019 18:17:44  19.3N   64.7W Md=3.4  EMSC   VIRGIN ISLANDS REGION

O: 28SEP2019 17:25:51  19.3N   64.7W Md=3.5  EMSC   VIRGIN ISLANDS REGION

O: 28SEP2019 17:40:21  19.3N   64.7W Md=3.6  EMSC   VIRGIN ISLANDS REGION

O: 28SEP2019 18:25:15  18.9N   64.6W Md=3.2  EMSC   VIRGIN ISLANDS REGION        

P: 24SEP2019 118826    19.0N   64.0W 3.0-4.9 BAAAA  Leeward Islands            

 

STRONG EARTHQUAKES IN SOUTH PACIFIC

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 27, 2019

 

A pair of strong earthquakes hit in the South Pacific today - an M 6.0 in the Kermadec Islands and an M 5.9 near Easter Island west of Chile. The strongest earthquake in the world today was an M 6.0 in the Kermadec Islands, New Zealand. NEIC reported it was felt with intensity III in Auckland, New Zealand. This activity accompanied a new geomagnetic storm and a new moon both of which were probably promotional factors in the size of these events. The geomagnetic storm saw AP the most disturbance since September 1. The tidal forecast for seismicity had read:

 

"The new moon arrives at 18:26 on September 28. Longitudes at sub-solar (local solar noon) conditions are within about 20 degrees of 95 West  longitude while those at anti-solar (local solar midnight) are near 85 East longitude.  These include western South and Central America and the central U.S. in the west and central Asia and western Indonesia in the east. These are the most likely area to see significant tidal triggering within the period September 25 through October 2. Other areas are also prone to tidal stresses and a significant global event in the next week is a possibility. Tidal triggering often promotes enhanced seismicity near local solar noon or local solar midnight when such stresses maximize." (September 25-27, 2019)

 

The M 6.0 in the Kermadec Islands, New Zealand was followed by an M 5.0 aftershock and by an M 5.0 event about 400 km to the south. The M 6.0 occurred within minutes of local solar midnight and was probably promoted by strong tidal stresses which maximize at this time. It is the strongest earthquake in the central Kermadec Islands within about 150 km of this epicenter since an M 6.3 on June 27, 2019. Both are probably aftershocks of an M 7.2 that hit near today's epicenter on June 15, 2019. Forecast 118982 had expected this activity within about 100 km around September 26.

 

O: 27SEP2019 14:02:06  30.0S  177.9W mb=5.0  EMSC   KERMADEC ISLANDS, NEW ZEALAND

O: 27SEP2019 12:05:02  30.2S  178.0W Mw=6.0  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 26SEP2019 118982    31.0S  178.0W 4.0-5.3 AAAAA  So. Kermadec Islands       

 

O: 27SEP2019 17:26:31  33.8S  178.6W mb=5.0  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 29SEP2019 118982    33.0S  179.0W 4.0-5.3 AAAAA  So. Kermadec Islands       

 

A strong M 5.9 also occurred today in the area of Easter Island in the Southeastern Pacific Ocean. It was not reported felt in this remote area. This epicenter is near the antipode of the deadly quake in Pakistan of September 24 (compare 35S 33N and 103W 74E for antipodality). It is likely that the earthquake in the Pacific today was enhanced or promoted by focused energy from Pakistan. Like the Pakistan quake before it this area has been relatively quiet in recent years. The only event in the past 8 years of M>=5.9 within about 250 km of this epicenter was an M 6.3 on December 19, 2018 and prior to that an M 5.9 on December 5, 2010. Only one other earthquake of M>6 has occurred in this area in the past 30 years - an M 6.5 on May 29, 1997. 

 

O: 27SEP2019 15:11:29  35.9S  102.9W Mw=5.9  EMSC   SOUTHEAST OF EASTER ISLAND   

 

The strongest earthquake in the U.S. or Canada today was an M 4.8 in the Unalaska area of the Fox Islands, Aleutians. It was felt with intensity III in Unalaska according to NEIC. The M 4.8 was accompanied by a series of other events in the general area including a foreshock of M 4.1 and an M 3.7 and 3.6 to the east of these epicenters. When a number of moderate earthquake occur in an active area such as the Fox Islands within a short period, it can indicate strong regional stresses and the possibility of a larger coming event. The eastern Fox Islands have been relatively quiet in recent months. The last earthquake in this area with M>=4.8 within about 150 km of today's epicenter was an M 5.4 on September 14 and prior to that an M 5.2 on August 3, 2019 with the last new moon. Forecast 118940 had expected a moderate quake up to M 4.8 was likely in the area around September 26.

 

O: 27SEP2019 23:27:29  53.3N  166.0W mb=4.8  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 27SEP2019 08:01:43  53.5N  165.9W mb=4.1  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 26SEP2019 118940    54.2N  165.0W 3.5-4.8 AAAAA  Unimak Islands, Aleutians  

 

O: 27SEP2019 09:16:07  54.4N  161.2W ml=3.7  EMSC   ALASKA PENINSULA             

P: 28SEP2019 118940    54.6N  161.7W 3.5-4.8 AAAAA  Unimak Islands, Aleutians  

 

O: 28SEP2019 05:32:43  54.8N  163.3W mb=3.6  EMSC   UNIMAK ISLAND REGION, ALASKA 

P: 28SEP2019 118940    54.6N  161.7W 3.5-4.8 AAAAA  Unimak Islands, Aleutians  

 

An unusual earthquake in the Gulf of Aden of M 4.9 may have been promoted by passage through the area several days ago by Tropical Cyclone Hikaa. Landfall occurred near today's epicenter. This summary had noted this storm as:

 

 

O: 27SEP2019 17:48:29  14.7N   52.4E Mw=4.9  EMSC   GULF OF ADEN                 

 

The last earthquake of larger magnitude within about 200 km of this epicenter was an M 5.9 on July 15, 2018.

 

MODERATELY STRONG QUAKE SHAKES ISTANBUL, TURKEY

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 26, 2019

 

A moderately strong earthquake of M 5.7 in the Marmara Sea southeast of Istanbul, Turkey was widely felt in that region today. NEIC reported maximum intensit VII in Celaliye, Istanbul and VI in Llimarsinan with V in Silivri, Ortakoy, Kumburgaz, Tepecil and Yakuplu, Turkey among other communities within about 500 km of the epicenter as far as Greece, Bulgaria, Armenia and Saudi Arabia. It was followed by at least 188 aftershocks which were felt with light to moderate intensity. At least 24 people were hospitalized following the earthquake which also slightly damaged as many as 473 buildings in Istanbul mostly with cracked walls. This included a minaret which collapsed in the Avcilar district of western Istabul. Evacuations were common. Many residents of the area spent the night outside for fear of future seismic events. No one was reported killed in the earthquake.

 

The last earthquake of larger magnitude within about 200 km of today's epicenter south of Istanbul was the great M 7.8 Izmit earthquake of August 17, 1999. Most earthquakes since then with M>=5.7 have occurred about 250 km south of today's epicenter. The largest of these was an M 6.5 on February 3, 2002. An M 7.3 occurred this distance to the east on November 12, 1999 as well. Great earthquakes in the region have occurred on August 17, 1999 (M 7.8 – in association with a major solar eclipse); an M 7.5 n March 18, 1953;  an M 7.8 on August 9, 1912; M 7.5 on February 28, 1855; and an M 7.5 February 23, 1653, among others.      

 

The current series began with an M 4.9 on September 24, 2019. This summary had noted this event at the time as:

 

 

"An earthquake of M 4.9 also shook the region around Istanbul, Turkey today. NEIC reported it was felt in Istanbul at Istanbul with intensity IV and in Silvri, Gurpinar, Esenyurt, Hadimkoy, Buyuukcekmece, Tekirdag, and Sultanbe, Turkey.

 

"A moderate earthquake of M 4.9 also shook the region near Istanbul today.

... This is the strongest earthquake to occur near Istanbul since events of M 5.0-5.2 on July 25, 2011,  November 3, 2010 and December 28, 2008. This is an area of the Anatolian Fault where a strong earthquake is expected in the near future." (June 8, 2012)

 

and more recently:

 

"A strong earthquake is expected in this area. Moderate foreshocks such as this are likely to continue in the region in preparation for this upcoming event." (December 20, 2018)

 

At M 4.9 this is the strongest earthquake in the Istanbul, Turkey area within about 150 km since an M 5.1 on June 7, 2012 and prior to that an M 5.2 on October 20, 2006. Forecast 118920 had expected today's event within about 100 km was likely around September 27. This earthquake in Turkey is at 103 degrees from the M 7.3 in Ceram/Banda of June 24, 2019 and may indicate a strong aftershock is likely soon in that area. It is also at 103 degrees from the M 8.0 in Peru of May 26 and was likely  enhanced by energy from those events." (September 24, 2019)

 

But prior suggestions of a strong upcoming event in the Istanbul had also been noted this month such as the relation to the M 7.1 in Ridgecrest, Central California first on September 14 and repeated in the previous issue of this summary as:

 

 

"An earthquake of M 4.8 shook areas of north-central Turkey today. NEIC reported maximum intensity IV in Turkey at Ankara and III in Incesu Kaysen, Turkey.

This epicenter about 200 km east of Istanbul, Turkey is the strongest in the area within about 250 km since an M 5.6 on December 26, 2007, more than 11 years ago. ... This event is located at 99 degrees from the M 7.1 quake in Ridgecrest, California of July 6, 2019 and may have been promoted from that source." (September 14, 2019)

 

The relation between Central California and Turkey was also noted at the time of the M 7.1 in Central California as:

 

"Those (areas) at or near 103 degrees from Southern California include southern New Zealand, Greece and Turkey and Iran/Iraq, Central Asia and China, the Northern Philippines, New Britain and eastern Indonesia. These areas could see enhanced seismicity in the coming days ...  " (July 6, 2019)

 

As with M 7.8 in the Sea of Marmara, south of Istanbul of August, 1999 which was closely associated with the new moon and solar eclipse over the region, today's event also appears to be associated with tidal stresses from the upcoming new moon. It occurred within minutes of local solar noon - a time when tidal stresses maximize in the earth. The tidal forecast for this new moon had read:

 

"The new moon arrives at 18:26 on September 28. Longitudes at sub-solar (local solar noon) conditions are within about 20 degrees of 95 West  longitude while those at anti-solar (local solar midnight) are near 85 East longitude.  These include western South and Central America and the central U.S. in the west and central Asia and western Indonesia in the east. These are the most likely area to see significant tidal triggering within the period September 25 through October 2. Other areas are also prone to tidal stresses and a significant global event in the next week is a possibility. Tidal triggering often promotes enhanced seismicity near local solar noon or local solar midnight when such stresses maximize." (September 25-26, 2019)

 

This summary had also noted the earthquake of August, 1999 in the History section as:

 

"At least 17,000 were killed and 50,000 injured from this earthquake which left more than 500,000 homeless and thousands missing. Estimated cost was $7 billion (U.S. Dollars). Severe damage from Istanbul, Kocaeli and Sakryna Provinces of Turkey. Damage occurred to homes, public buildings and mosques.  Liquefaction was common and large sections of several cities were inundated and subsided. Part of the motorway between Istanbul and Ankara buckled causing cars to crash into each other. Up to 5 meters of displacement occurred along the North Anatolian Fault. A tsunami was generated which caused additional damage in many areas around the Marmara Sea." (August 17, 2019)

 

The last earthquake in western Turkey within about 200 km of today's epicenter in the Marmara Sea of M>=5.7 occurred on August 17, 1999. Events slightly further from today's epicenter occurred with M 5.7-5.8 on May 19, 2011 (abouot 250 km southeast) and on July 6, 2003 also with M 5.7 (southwest of today's epicenter.) Forecast 118920 had expected activity in this area within about 100 km of the mainshock was likely around September 27.

 

O: 26SEP2019 20:20:18  40.9N   28.2E ML=4.3  EMSC   WESTERN TURKEY               

O: 26SEP2019 10:59:25  40.9N   28.2E Mw=5.7  EMSC   WESTERN TURKEY               

O: 26SEP2019 12:17:09  40.9N   28.3E ML=3.8  EMSC   WESTERN TURKEY               

O: 26SEP2019 11:26:36  40.9N   28.3E ML=4.2  EMSC   WESTERN TURKEY               

P: 27SEP2019 118920    40.0N   28.0E 3.0-4.8 AAAAA  Romania/NW Turkey          

 

The strongest earthquake in the world today was an M 6.1 in south-central Chile in the Los Lagos area. NEIC reported it was felt with intensity IV in Los Lagas at Rio Bueno, Parranque, Osomo and Puerto Monhff and II-III in Puerto Varas, La Union, Panguipulli, Validvia and Villarrica, Chile and in Barioche Rio Negro, Argentina. The area along the coast of South America has been unusually quiet over the past three months. A solar eclipse was visible in this region of Chile in early July, 2019. This summary had expected the possibility of a major quake in the eclipse area at the time. This was delayed and eventually occurred as an M 6.8 on August 1, 2019 at the epicenter which saw the greatest eclipse a month earlier - also with the new moon.

 

As with the earthquake near Istanbul, Turkey, today's event in Chile occurred within about an hour of local solar noon and was likely enhanced by tidal stresses. It is the strongest earthquake in the central South American coastline since the M 6.8 of August 1, the last earthquake in the world of that size or greater (Sumatra also saw an M 6.8 on August 2). Three events of M>=5.3 have hit the general area from Los Lagos to Coquimbo in the past three days however, so the stored seismic energy during this quiet period appears to be in the process of being released. These include an M 5.4 today in Coquimbo, Chile and an M 5.3 in Biobio, Chile on September 23, 1999.

 

GUC reported this earthquake in Los Lagos was felt with intensity VI in  Los Lagos at Puerto Montt, V in Ancud, Casro, Fresia, Frutillar, Llanquihyem Los Muermos, Maullni, Puerto Varas, Puqueldon, Purranque, Puyehue, Rio Negro and San Juan de la Costa; IV-V in La Araucania at Carahue, Chochol, Cunco, Freire, Galvarino, Gorbea, Lautaro, Loncoche, Nueva Imperial, Padre las Casas, Pitrufquen, Pucon, Saavedra, Temuco, Teodoro Schmidt, Tolten, Vilcun, Villarrica; Los Rios a Corral, Lanco, Los LAgos, Mafil, Mariquina, Mehuin, Pailaco, Rio Bueno and Valdivia; and Bio-Bio with IV in Laja and III Nuble in Quillon, Chillan, Chile. The last earthquake with M>=6.1 within about 400 km of this epicenter was an M 7.6 about 400 km to the south on December 25, 2016. The last event within about 250 km of today's epicenter in the Los Lagos area was an M 6.4 on August 22, 1999 – only about five days after the M 7.8 in the Marmara Sea of that year. These areas are at the third node from each other (120 degrees) and some triggering may be occurring.  Forecasts 118778 and 118977 had expected today's activity to the north around September 18-28.

 

 

O: 26SEP2019 16:36:17  40.8S   72.1W Mw=6.1  EMSC   LOS LAGOS, CHILE             

O: 26SEP2019 16:36     40.8S   72.3W mb=6.0  GUC    Los Lagos at Puerto Montt, V i

P: 18SEP2019 118778    37.0S   72.0W 4.0-5.3 CCAAA  Central Chile              

P: 28SEP2019 118977    36.0S   73.0W 4.0-5.3 ACAAA  Central Chile              

 

GUC reported the earthquake of M 5.4 off the coast of Coquimbo, Chile was felt with intensity  V in  Coquimbo at Andacollo, Combarbala; VII in La Serena; VI in La Higuera, Ovalle, Punitaqui, Rio Hurtado, Salamanca; V in Vicuna, Paiguano, Combarbala and Andacollo; Valparaiso with V in La Ligua; IV in Limache, Quillota, San Felipe, Valparaiso and Zapallar; O'Higgins with IV in Navidad; and in Atacama with IV in Vallenar and III in Copiapo and Tierra Amarilla, Chile.

NEIC reported this earthquake of M 5.4 in Coquimbo, Chile  was felt with intensity IV in La Serena and V in Coquimbo and IF in Vicuna, Chile and II-III in the area(s) of Coquimbo, Chile At Los Andes, Vina del Mar, Valparaiso, Lampa, Santiago and in Mendoza, Argentina. The last earthquake with M>=5.4 within about 200 km of this epicenter was an M 6.4  more than three months ago on June 14, 2019. Forecasts 118978 and 118967 had expected today's activity was likely around September 28-29.

 

O: 26SEP2019 20:31:30  29.9S   71.3W Mw=5.4  EMSC   OFFSHORE COQUIMBO, CHILE     

O: 26SEP2019 20:31     29.9S   71.3W mb=5.4  GUC    Coquimbo at Andacollo, Combarb

P: 29SEP2019 118967    29.0S   70.0W 4.0-5.3 BAAAA  Coast Central Chile        

P: 28SEP2019 118978    30.0S   69.0W 4.0-5.5 AABAA  Coast Central Chile        

 

An aftershock of M 4.7 was also felt in the Mirapur area of Pakistan when an M 5.9 occurred two days ago. NEIC reported this event was felt with maximum intensity V in Punjab, Pakistan at Taxila; IV in Jhelum and Rawalpindi and II-III in Lahore, Pakistan and in Jalandhar, India. The mainshock of M 5.9 did considerable damage in Pakistan and killed more than 24 people.

 

An unusual earthquake of M 5.2 occurred in the Canary Islands today. This may have been promoted by the passage of Hurricane Lorenzo near this epicenter in the past several days as noted in previous issues of this summary:

 

"Hurricane Lorenzo continued today west of the Canary Islands with winds up to 125 kts. It is expected to track to the west as a hurricane through the end of the week and to turn to the north in late September before approaching the Azores. This storm passed near the Canary Islands in the past several days and may have promoted the earthquake of M 4.7 there today." (September 21-26, 2019)

 

Volcanism may be involved with today's event which occurred near local solar noon. The last, and only event in the past 30 years within about 400 km of this epicenter in the Canary Islands with M>=5.2 was an M 5.4 on December 27, 2013. There are parallels with that event and today's as noted in the summaries from December, 2013:

 

"A series of light earthquake began hitting the Canary Islands today. This appears to be a reinvigoration of the eruptive status of El Hierro Volcano and bears watching. This appears to have begun about the time of the full moon and tidal effects may have been an initiating effect. It is also likely that these earthquake were prompted by the renewed solar flare  activity which began at the same time these small events began in the Canary Islands." (December 23, 2013)

 

and

 

"A strong earthquake of M 5.8-6.1 shook areas of southern Turkey, the eastern Mediterranean as far south as Egypt today." (December 27, 2013)

 

NEIC reported this earthquake of M 5.2 in the Canary Islands, Spain  was felt with intensity II-III in the area(s) of the Canary Islands, Spain at Valle Gran Rey, Santa Cruz de Tenerife, Spain.

 

O: 26SEP2019 07:33:57  27.7N   18.2W ML=3.1  EMSC   CANARY ISLANDS, SPAIN REGION 

O: 26SEP2019 14:49:56  27.8N   18.2W ML=3.4  EMSC   CANARY ISLANDS, SPAIN REGION 

O: 26SEP2019 13:02:06  27.9N   20.3W mb=5.2  EMSC   CANARY ISLANDS, SPAIN REGION 

 

The largest earthquake in the U.S. or Canada today was an M 4.2 in the Southern Yukon Territory, Canada. It was not reported felt in this remote area. The last earthquake within about 250 km of this epicenter with M>=4.2 was an M 4.2 on June 16, 2015 - the last of larger magnitude occurred on July 16, 2014 with M 4.6. Forecast 118952 had expected regional activity in the Yukon Territory around September 25.

 

O: 26SEP2019 23:32:09  60.8N  125.8W MB=4.2  ECAN OF NAHANNI BUTTE, NT           

O: 26SEP2019 23:32:06  60.9N  125.4W mb=4.2  EMSC   SOUTHERN YUKON TERRITORY, CANA

P: 25SEP2019 118952    63.0N  129.0W 2.5-4.0 ACBAA  Yukon Territory, Canada    

 

STRONG EARTHQUAKE DAMAGING IN SERAM, INDONESIA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 25, 2019

 

A strong earthquake of M 6.5-6.6 hit the area of Seram, Indonesia north of the Banda Sea today. NEIC reported it was felt with intensity VII in Ambon, Maluku and V in Amahai, Indonesia. The damage was largely limited to Ambon and Kairatu, Indonesia. Local sources reported the earthquake damaged some buildings but no tsunami was generated. Among the damage - a bridge cracked and a University building damaged in Ambon, Indonesia. No major injuries or deaths were immediately reported. This earthquake is at 101 degrees from the Istanbul quake of M 4.9 yesterday and had been anticipated in the previous issue of this report as:

 

"This earthquake in Turkey is at 103 degrees from the M 7.3 in Ceram/Banda of June 24, 2019 and may indicate a strong aftershock is likely soon in that area." (September 24-25, 2019)

 

This suggests a match of seismic ping pong may be taking place between Indonesia and Turkey and that further and larger events in both areas are likely. Seismicity in the region of Istanbul, Turkey, today, however did not include any moderate events. Incidentally as noted in this summary on September 14, this region of Turkey is also near 100 degrees from the M 7.1 in Ridgecrest, California of July 6, 2019 – another possible promoter of regional seismic enhancement as noted at the time:

 

"An earthquake of M 4.8 shook areas of north-central Turkey today. NEIC reported maximum intensity IV in Turkey at Ankara and III in Incesu Kaysen, Turkey.

This epicenter about 200 km east of Istanbul, Turkey is the strongest in the area within about 250 km since an M 5.6 on December 26, 2007, more than 11 years ago. ... This event is located at 99 degrees from the M 7.1 quake in Ridgecrest, California of July 6, 2019 and may have been promoted from that source." (September 14, 2019)

 

Today's Seram earthquake is the strongest within about 250 km of today's epicenter since an M 6.9 on December 9, 2015 and prior to that an M 6.7 on March 14, 2006. Forecast 118801 had expected activity to the south of this was likely around September 25.

 

The earthquake in Seram was initially given M 6.8, the strongest quake in the world since an M 6.9 in Sumatra on August 2, 2019. Only two events since then have had equal magnitude - those of M 6.5-6.6 on September 1 in Tonga and in the South Sandwich Islands on August 27, 2019.

 

O: 25SEP2019 16:13:27   2.8S  127.9E ML=4.5  EMSC   CERAM SEA, INDONESIA

O: 25SEP2019 11:35:59   3.1S  127.9E mb=4.4  EMSC   SERAM, INDONESIA

O: 26SEP2019 00:00:10   3.4S  128.1E ML=4.0  EMSC   SERAM, INDONESIA

O: 26SEP2019 00:23:31   3.4S  128.3E ML=4.1  EMSC   SERAM, INDONESIA

O: 25SEP2019 23:46:46   3.4S  128.4E Mw=6.5  EMSC   SERAM, INDONESIA

O: 26SEP2019 00:15:11   3.6S  128.3E ML=4.1  EMSC   SERAM, INDONESIA

O: 26SEP2019 00:40:02   3.6S  128.5E Mw=5.4  EMSC   SERAM, INDONESIA

O: 26SEP2019 02:20:13   3.7S  128.3E ML=4.0  EMSC   SERAM, INDONESIA

O: 26SEP2019 03:37:17   3.7S  128.4E ML=4.1  EMSC   SERAM, INDONESIA

O: 26SEP2019 05:28:41   3.7S  128.5E mb=4.2  EMSC   SERAM, INDONESIA             

P: 25SEP2019 118801     6.0S  128.0E 4.0-5.4 ACAAA  Banda Sea                  

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in Central Alaska near Healy. NEIC reported it was felt with intensity II-III in Healy, Cantwell, Clear, Fairbanks, For Wainwright, North Pole and Chugiak, Alaska.

This is the strongest earthquake within about 100 km of this epicenter in Central Alaska since an M 4.4 on April 11, 2019 and prior to that an M 4.9 on July 1, 2018. Forecast 118947 had expected activity southwest of this was likely in Central Alaska around September 25.

 

O: 25SEP2019 13:45:13  63.8N  149.2W ML=4.2  EMSC   CENTRAL ALASKA               

P: 25SEP2019 118947    62.7N  151.6W 3.2-4.8 AAAAA  Central Alaska             

 

 

An earthquake of M 4.6 occurred off the southern coast of Haiti today. NEIC reported it was felt with intensity II in Haiti at Roche-a-Bateau, South Haiti.

It was probably promoted by stress redistribution from the M 6.0 two days ago in the Puerto Rico Trench as well as stresses from Tropical Storm Karen, currently in the area. Forecast 118835 had expected this event to the northeast around September 24.

 

 

O: 25SEP2019 13:44:37  17.9N   73.6W mb=4.6  EMSC   HAITI REGION                 

P: 24SEP2019 118835    19.0N   71.0W 3.4-4.8 ABBAA  Puerto Rico                

 

GLOBAL SEISMICITY MAKES A COMEBACK

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 24, 2019

 

After two months of relatively quiet global seismicity, a series of moderate and unusual earthquakes today suggest that a more active period is beginning. In addition to an unusual M 4.6 in the North Sea, two strong earthquakes occurred today - an M 5.9 in Pakistan and an M 6.0 in the Southwest Indian Ridge. The quake in Pakistan was widely felt and damaging in the region. The event in the Indian Ridge is nearly antipodal to southern California and may enhance larger events in that antipodal region in coming days. This is the largest earthquake today. It occurred within about an hour of local solar midnight and may have been promoted by strong tidal stresses. At M 6.1 it is the largest earthquake within about 300 km of this epicenter since an  M 6.1 on August 17, 2013. No earthquakes of larger magnitude have hit this area in at least 30 years. Forecast 118981 had expected today's events within about 100 km of the epicenter were likely around September 27. The last of larger magnitude in this region was an M 6.4 on April 12, 1988. The largest earthquake ever recorded in this area was an M 7.9 on December 8, 1951 months before the M 7.9 in Bakersfield, California in July, 1952.

 

O: 24SEP2019 21:19:48  33.8S   56.3E Mw=6.0  EMSC   SOUTHWEST INDIAN RIDGE

O: 24SEP2019 21:19:47  33.8S   56.3E Mw=6.1  ANSS   SOUTHWEST INDIAN RIDGE

O: 24SEP2019 21:25:09  33.8S   56.3E mb=5.1  EMSC   SOUTHWEST INDIAN RIDGE

O: 24SEP2019 21:12:04  34.2S   56.2E Mw=5.1  EMSC   SOUTH INDIAN OCEAN

O: 24SEP2019 21:29:41  33.7S   56.2E mb=4.9  EMSC   SOUTHWEST INDIAN RIDGE       

P: 27SEP2019 118981    33.0S   57.0E 4.0-5.3 BAAAA  So. Indian Ocean           

 

A moderately strong earthquake of M 5.6 occurred in Pakistan today. NEIC reported maximum intensity VI in Punjab,  Pakistan at Jhelum, Sarai Alamgir and Phalia with V in Kharian, Gujirakhan, Guijat and Punch and IV in Mandibahauddin and Kahuta, Pakistan. News sources indicate at least 38 were killed in this event and at least 700 injured. Online photos showed collapsed houses and huge ground cracks in the epicentral area. The epicenter was close to Mirpur, Kashmir, Pakistan. Most of the damage was in Mirpur and Kotli, another part of Kashmir but damage extended to Lahore.

 

The last earthquake of M>=5.9 within about 250 km of today's Pakistan epicenter

occurred on October 8, 2005 with M 7.6. Forecasts 118664 and 118860 had expected today's earthquake in late September within about 100 km of this epicenter.

 

The earthquake in the South Indian Ocean and in Pakistan are on either side of

Tropical Cyclone Hikaa which may have helped enhance this activity. This summary had previously noted:

 

"TC Hikaa formed today in the area east of Somalia with winds up to 45 kts. It is expected to track to the west and may enhance seismicity in the area in the next several days. A moderate earthquake in Pakistan today may have been promoted by stresses from this storm." (September 22-24, 2019)

 

O: 24SEP2019 11:01:55  33.1N   73.8E mb=5.9  EMSC   PAKISTAN                     

P: 18SEP2019 118664    34.0N   74.0E 3.8-5.1 CAAAA  Pakistan                   

P: 27SEP2019 118860    35.0N   73.0E 3.8-5.1 BBAAA  Hindu Kush/Pakistan        

 

An earthquake of M 4.9 also shook the region around Istanbul, Turkey today. NEIC reported it was felt in Istanbul at Istanbul with intensity IV and in Silvri, Gurpinar, Esenyurt, Hadimkoy, Buyuukcekmece, Tekirdag, and Sultanbe, Turkey.

 

"A moderate earthquake of M 4.9 also shook the region near Istanbul today.

... This is the strongest earthquake to occur near Istanbul since events of M 5.0-5.2 on July 25, 2011,  November 3, 2010 and December 28, 2008. This is an area of the Anatolian Fault where a strong earthquake is expected in the near future." (June 8, 2012)

 

and more recently:

 

"A strong earthquake is expected in this area. Moderate foreshocks such as this are likely to continue in the region in preparation for this upcoming event." (December 20, 2018)

 

At M 4.9 this is the strongest earthquake in the Istanbul, Turkey area within about 150 km since an M 5.1 on June 7, 2012 and prior to that an M 5.2 on October 20, 2006. Forecast 118920 had expected today's event within about 100 km was likely around September 27. This earthquake in Turkey is at 103 degrees from the M 7.3 in Ceram/Banda of June 24, 2019 and may indicate a strong aftershock is likely soon in that area. It is also at 103 degrees from the M 8.0 in Peru of May 26 and was likely  enhanced by energy from those events.

 

O: 24SEP2019 07:30:49  40.9N   28.2E ML=3.1  EMSC   WESTERN TURKEY               

O: 24SEP2019 08:00:22  40.9N   28.2E mb=4.9  EMSC   WESTERN TURKEY               

P: 27SEP2019 118920    40.0N   28.0E 3.0-4.8 BAAAA  Romania/NW Turkey          

 

An unusual earthquake of M 4.6 also occurred in the North Sea east Scotland today. It was not reported felt in the area. This is the strongest earthquake in the North Sea within about 200 km of this epicenter in at least 30 years. An M 5.0 hit about 200 km north of this epicenter on June 30, 2017. The only other comparable event in the area in the past 30 years was an M 4.7 about 500  km southeast of this on October 20, 2004. Forecast 118941 had expected regional activity was likely around September 24. This epicenter is at 103 degrees from the Sumatra M 6.8 of August 2, 2019 and may have been promoted from that source.

 

O: 24SEP2019 13:38:12  57.0N    1.8E mb=4.6  EMSC   NORTH SEA                    

P: 24SEP2019 118941    54.0N    2.0W 3.0-4.4 ACCAA  United Kingdom             

 

Moderate aftershocks continued in the region North of Puerto Rico. Earthquakes of  M 4.4  and M 4.8 were felt with intensity V in Anasaco and Aguada, Puerto Rico and within about 100 km of the epicenter with II-III in Aguadilla, Isabela, Moca, San Sebastian, Rincon, Hatillo, Arecibo, Mayaguez, Dorado and Hormigueros.

 

The largest earthquake in the U.S. or Canada today was an M 4.1 in northern Utah. NEIC reported it was felt with intensity III in Utah at Garland, Tremonton, Plymouth, Fielding, Portage, Snowville, Collinston, Deweyville, and Honeyville. This is the strongest earthquake in northern Utah within about 250 km of this epicenter since an M 4.3 on January 26, 2018 and the strongest within about 100 km since November, 1992. Forecast 118927 had expected regional activity was likely at the end of September.

 

O: 24SEP2019 16:15:41  41.8N  112.4W mb=4.1  EMSC   UTAH                         

P: 28SEP2019 118927    44.2N  110.3W 2.0-3.9 BCBAA  Yellowstone/Wyoming        

 

An M 3.7 Ridgecrest, California aftershock also occurred today near Coso Junction. NEIC reported it was felt with intensity V in California at Inyokern and III in Ridgecrest. This continues aftershock activity in the area and may have been promoted by the near-antipodal M 6.0 in the Indian Ocean today. Forecast 118888 had expected today's activity was likely around September 28.

 

O: 24SEP2019 16:08:13  36.1N  117.9W Mw=3.7  EMSC   CENTRAL CALIFORNIA           

P: 28SEP2019 118888    35.9N  117.7W 2.5-4.4 BAAAA  So. California             

 

Seismicity also remained high in the region of Puerto Rico with aftershocks of

M 4.9, 4.6 and 4.2 among others. This activity occurred as Tropical Storm

Karen centered over the epicenter. Further activity of this type and perhaps larger is still expected in the next several days. This summary had noted the coincidence with TS Karen in previous summaries as:

 

"TS Karen continued today in the north of Puerto Rico with winds up to 45 kts. It is expected to track to the north in the next several days. A minor seismic enhancement in the region may occur.. Stresses from this storm may have contributed to the M 6.0 in Puerto Rico today. Moderate aftershocks of the M 6.0 in Puerto Rico occurred as TS Karen passed over the area today." (September 22-25, 2019)

 

Forecast 118837 had expected this activity north of Puerto Rico was likely around September 23.

 

O: 24SEP2019 07:48:17  18.9N   67.2W ML=3.2  EMSC   PUERTO RICO REGION

O: 24SEP2019 11:12:35  19.1N   67.1W ML=3.4  EMSC   PUERTO RICO REGION

O: 25SEP2019 01:05:07  19.1N   67.1W mb=4.6  EMSC   PUERTO RICO REGION

O: 24SEP2019 10:19:54  19.1N   67.2W ML=3.5  EMSC   PUERTO RICO REGION

O: 24SEP2019 08:37:56  19.1N   67.2W mb=4.4  EMSC   PUERTO RICO REGION

O: 25SEP2019 00:12:06  19.1N   67.2W mb=4.9  EMSC   PUERTO RICO REGION

O: 24SEP2019 08:29:31  19.2N   67.2W ML=3.4  EMSC   PUERTO RICO REGION

O: 25SEP2019 00:29:50  19.2N   67.2W mb=4.2  EMSC   PUERTO RICO REGION

O: 24SEP2019 07:33:20  19.2N   67.3W Md=3.2  EMSC   PUERTO RICO REGION

O: 24SEP2019 08:51:40  19.2N   67.3W Md=3.2  EMSC   PUERTO RICO REGION

O: 24SEP2019 20:19:25  19.2N   67.3W Md=3.6  EMSC   PUERTO RICO REGION

O: 24SEP2019 22:03:38  19.3N   66.5W ML=3.5  EMSC   PUERTO RICO REGION

O: 24SEP2019 23:19:35  19.3N   67.2W ML=3.8  EMSC   PUERTO RICO REGION            

P: 23SEP2019 118837    20.0N   68.0W 3.0-4.3 AAAAA  Bahamas/No. Caribbean      

 

STRONG, EXPECTED EARTHQUAKE SHAKES PUERTO RICO

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 23, 2019

 

A strong M 6.0 earthquake shook the island of Puerto Rico today. Several promotional factors for seismicity in Puerto Rico at this time had previously been identified in this summary. These include the passage of Hurrican Jerry and Tropical Storm Karen through the region over the past several days as well as the stresses from the full moon which were maximized near the longitude of Puerto Rico. Previous issues of this summary had noted these as:

 

"TS Karen formed today in the southern Caribbean with winds up to 35 kts. This storm hit Trinidad and Tobago with torrential rains and flooding. It is expected to track to the north possibly affecting Puerto Rico in the next several days. A minor seismic enhancement in the region may occur." (September 22-23, 2019)

 

and

 

"Hurricane Jerry continued today north of Puerto Rico with winds up to 55 kts. It is expected to turn to the north and to dissipate next week in the North Atlantic. No seismic watch is expected with this storm in the region north of Puerto Rico in the Puerto Rico Trench. Low pressure over this area may help promote larger regional seismicity." (September 20-24, 2019)

 

These weather-related stresses followed strong tidal stresses associated with the last full moon. These stresses maximized near Puerto Rico as reported in the tidal forecast in previous issues of this summary:

 

"The full moon arrived at 04:33 UT on September 14. Longitudes which are anti-solar at this time (at local solar midnight) are located near 67 West longitude while those which are sub-solar are near 113 East longitude. The most likely tidal trigger for this alignment is in Indonesia, the Philippines and western Japan in the east and in Puerto Rico, the Dominican Republic and the western coast of South America in the west. A strong earthquake in South America or Indonesia is likely in the next five days. While these are the most likely areas to see tidal triggering at this time, such seismic promotion can occur in many areas. A strong to major earthquake related to tidal triggering is considered likely in mid-September.  Such earthquakes are most likely near local solar noon and local solar midnight when tidal stresses are maximized in the earth." (September 14-20, 2019)

 

The epicenter was about 50 miles NNW of Isabela, Puerto Rico. The quake occurred

within about an hour of local solar midnight when tidal stresses maximize and may have helped enhance this event. No damage from the quake was immediately reported and no tsunami threat was expected from this sized earthquake. Several moderate aftershocks including an M 4.7 were recorded.

 

In recent issues of this summary the increased seismicity in the region of Puerto Rico had been noted as when an M 4.5 occurred on September 18 in the Dominican Republic:

 

"Seismicity at the opposite longitude (around 65W) also continued at elevated levels today with an M 4.5 in the Dominican Republic. NEIC reported this earthquake of M 4.5 in the Dominican Republic was felt with intensity V in Cabrera Maria Trinidad and IV in Arroyo Salado Maria, Dominican Republic and II-III in the area(s) of the Dominican Republic at Nagua, Santo Domingo and El Carril.

This area has been active over the past several days with the last events of

M>=4.5 on July 28, 2019 with M 4.7 about 150 km southeast of today's epicenter.

Forecast 118627 had expected today's activity was likely around September 20." (September 19, 2019)

 

NEIC reported the mainshock was felt with maximum intensity V in Puerto Rico at San Antoniom Quebradillas, IV in Aguadilla, Isabela, Aguada, Rincon, Camuy, and Anasco and within about 200 km of the epicenter in the Puerto Rico trench.

A series of moderate aftershocks including an M 5.0 and 4.4 were felt in a similar area. An aftershock of M 4.3 was felt in Puerto Rico with maximum intensity V in Camuy and Hatillo; IV in Isabela, Quebradillas, Aguada, Rincon and Mayaguez and II-III in Aguadilla, Moca and San Sebastian among others.

The aftershocks suggest that the activity is not over and that the M 6.0 may not have used up the available seismic energy in the trench. It has been nearly 75 years since a strong tsunami hit in this area but such an event remains a possibility. Built structures could be vulnerable to a strong tsunami such as that in 1946. Thanks in large part to international and governmental efforts, the potential for a large tsunami in the area has been recognized and preparations for such an event have been made.

 

The last earthquake of M>=6.0 in the region of Puerto Rico was an M 6.4 on January 13, 2014 - the only such event in the region in the past 30 years. Strong or major earthquakes have been historically common in the region of Puerto Rico but not in recent years. The last such events prior to 2014 had occurred in June, 1989 and June 1948 with M 6.4 and 6.6. The last major event was an M 7.1 on August 3, 1961 and the last great tsunamigenic quake occurred on August 8, 1946.  Forecasts 118837 and 118835 had expected this activity in Puerto Rico within about 100 km of today's epicenter was likely around September 23-27.

 

 

O: 24SEP2019 06:15:09  18.9N   67.2W ML=3.3  EMSC   PUERTO RICO REGION

O: 24SEP2019 03:32:38  18.9N   67.3W Mw=4.7  EMSC   PUERTO RICO REGION

O: 24SEP2019 03:43:54  19.0N   67.2W ML=3.1  EMSC   PUERTO RICO REGION

O: 24SEP2019 05:42:35  19.0N   67.2W ML=3.5  EMSC   PUERTO RICO REGION

O: 24SEP2019 04:09:47  19.0N   67.3W mb=4.6  EMSC   PUERTO RICO REGION

O: 24SEP2019 03:23:35  19.0N   67.4W Mw=6.0  EMSC   PUERTO RICO REGION

O: 24SEP2019 05:09:29  19.1N   67.1W ML=3.3  EMSC   PUERTO RICO REGION

O: 24SEP2019 03:51:06  19.1N   67.3W mb=4.6  EMSC   PUERTO RICO REGION           

P: 23SEP2019 118837    20.0N   68.0W 3.0-4.3 AAAAA  Bahamas/No. Caribbean      

P: 27SEP2019 118835    19.0N   66.0W 3.4-4.9 BAAAA  Puerto Rico                

 

 

The mainshock in Puerto Rico was followed 28 minutes later by an M 4.5 near the antipode in Broome, Australia. This was probably triggered by strong energy focusing at the antipode to Puerto Rico in the form of various reflected P- waves combined with antipodal effects from the tropical storms in the Caribbean at this time. Today's event occurred within minutes of local solar noon and was probably additionally promoted by high tidal stresses. It is probably an aftershock of the M 6.6 that hit this epicenter on July 14, 2019, the strongest aftershock since August 1, 2019 when an M 4.8 occurred. Prior to that no earthquakes of M>=4.5 had hit this region within about 200 km in the past 30 years.

 

O: 24SEP2019 03:51:39  18.2S  120.2E ML=4.0  EMSC   WESTERN AUSTRALIA            

O: 24SEP2019 03:51:38  18.2S  120.2E ML=4.5  ANSS   WESTERN AUSTRALIA            

 

The strongest earthquake in the U.S. or Canada today was an M 5.3 in the Fox Islands, Aleutians. It was not reported felt in this remote area. The last earthquake in the Fox Islands within about 200 km of this epicenter of larger or equal magnitude occurred on September 14, 2019 and prior to that on July 9, 2019 - both of M 5.3-5.4. The last of larger magnitude in the area was an M 5.9 more than two years ago on  May 24, 2017. Forecast 118940 had expected today's activity was likely around September 26.

 

O: 23SEP2019 20:14:21  52.6N  166.9W ml=3.7  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 23SEP2019 17:51:10  52.7N  167.0W Mw=5.3  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 23SEP2019 18:04:44  52.8N  167.1W mb=4.0  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 26SEP2019 118940    54.2N  165.0W 3.5-4.8 BBBAA  Unimak Islands, Aleutians  

 

A pair of moderate earthquakes in the Gulf of California today followed warnings in this summary in the previous issue regarding the effect of two hurricanes on the area at this time. That had read:

 

 

Seismicity in the Gulf of California is expected to increase in the next several days. Two Tropical Storms have been moving up this region and are likely to  enhance seismicity in the region. These have been noted in previous issues of this summary as:

 

"Tropical Storm Mario continued south of Gulf of the California, Mexico today with winds up to 45 kts.  It may impact western Mexico in the next several days, enhancing seismicity in the regions of Jalisco and Gulf of California." (September 19-22, 2019)

 

Today's activity was not reported felt in this remote area. The last earthquake

within about 150 km of these epicenter with M>=4.5 had occurred on January 19, 2018 with M 4.5 and 6.3 and prior to that on August 10, 2014 with M 5.0. Forecast 118839 had expected these events within about 25 km were possible around September 23-24.

 

O: 23SEP2019 09:28:44  27.8N  112.0W Mw=4.5  EMSC   GULF OF CALIFORNIA           

O: 23SEP2019 08:18:13  28.0N  112.0W ML=4.2  EMSC   GULF OF CALIFORNIA           

P: 24SEP2019 118839    28.0N  112.0W 3.5-4.9 AAAAA  Gulf of California         

 

and

 

"Hurricane Lorena continued in the Gulf of California, Mexico today with winds up to 50 kts.  It may impact seismicity in the Gulf of California in the next three days. A moderate earthquake could be triggered in this area during this period." (September 19-22, 2019)forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 6.8 in Sumatra on August 2, 2019 where promoted seismicity is considered likely.

 

MODERATE AFTERSHOCKS CONTINUE FELT IN ALBANIA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 22, 2019

 

Many aftershocks of moderate magnitude continued to be felt in Albania today after the M 5.8 there yesterday. The largest of today's aftershocks was an M 4.4. NEIC reported it was felt with maximum intensity V in Vlore and IV in Kruje, Lac Kurbin, Kamze, and Triana, Albania and within about 200 km of the epicenter. Forecasts 118898 and 118919 had expected today's activity in  Albania was likely to continue through the end of September.

 

O: 22SEP2019 20:08:42  41.5N   19.6E mb=4.4  EMSC   ALBANIA                      

O: 22SEP2019 22:03:02  41.5N   19.7E ML=3.7  EMSC   ALBANIA                      

P: 23SEP2019 118898    40.0N   19.0E 3.0-4.9 ABAAA  Adriatic Sea                

P: 27SEP2019 118919    41.0N   19.0E 3.0-4.9 BAAAA  Romania/NW Turkey          

 

Seismicity in the Gulf of California is expected to increase in the next several days. Two Tropical Storms have been moving up this region and are likely to  enhance seismicity in the region. These have been noted in previous issues of this summary as:

 

"Tropical Storm Mario continued south of Gulf of the California, Mexico today with winds up to 45 kts.  It may impact western Mexico in the next several days, enhancing seismicity in the regions of Jalisco and Gulf of California." (September 19-22, 2019)

 

and

 

"Hurricane Lorena continued in the Gulf of California, Mexico today with winds up to 50 kts.  It may impact seismicity in the Gulf of California in the next three days. A moderate earthquake could be triggered in this area during this period." (September 19-22, 2019)forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the earthquake of M 6.8 in Sumatra on August 2, 2019 where promoted seismicity is considered likely.

 

Another area which has been affected by Hurricane Lorena was the area of Colima and Michoacan, Mexico. On September 19, this summary noted this as a possible seismic promoter as:

 

"Hurricane Lorena continued south of Michoacan, Mexico today with winds up to 80 kts.  It may impact western Mexico later in the week enhancing seismicity in the regions of Michoacan, Jalisco and the Gulf of California." (September 19, 2019)

 

An earthquake of M 4.6 occurred today in Colima and Michoacan, Mexico. This is the strongest earthquake in Colima or Michoacan, Mexico within about 200 km of this epicenter since an M 4.7 on February 18, 2019 and an M 4.6 on February 16, 2019. Forecast 118616 had expected today's activity within about 100 km of the epicenters around September 21.

 

NEIC reported this earthquake of M 4.6 offshore Colima, Mexico was felt with intensity II-III in the area(s) offshore Colima, Mexico at Manzanillo and Tlalnepantla, Mexico.

 

O: 22SEP2019 07:36:01  18.1N  103.4W ML=3.5  EMSC   OFFSHORE MICHOACAN, MEXICO   

O: 22SEP2019 22:12:33  18.8N  103.7W mb=4.6  EMSC   COLIMA, MEXICO               

P: 21SEP2019 118616    18.0N  103.0W 3.5-5.1 AAAAA  Michoacan, Mexico          

 

The strongest earthquake in the U.S. or Canada today was an M 3.5 in the Ridgecrest, California aftershock zone.  NEIC reported this earthquake of M 3.4 in Central California was felt with intensity II-III in the area(s) of Lone Pine, Central California. Ridgecrest is near 100 degrees from Albania, and the M 5.8 there yesterday may have helped enhance today's activity in California.

Forecast 118675 had expected today's aftershock was likely around September 21.

 

O: 23SEP2019 05:02:35  36.1N  117.9W Ml=3.4  EMSC   CENTRAL CALIFORNIA           

P: 21SEP2019 118675    35.9N  117.7W 2.5-4.4 AAAAA  So. California             

 

The strongest earthquake in the world today was an M 5.6 in the Tonga/Samoa area of the Southwest Pacific. It was not reported felt in this region. The last earthquake of M>=5.6 within about 200 km of this epicenter occurred as an M 5.8 on April 12, 2019 and prior to that an M 5.6 on June 2, 2018. Forecast 118961 had expected today's event was likely within about 100 km of the epicenter around September 25.  Forecast 118961 had expected today's event was likely within about 100 km of the epicenter around September 25.

 

 

O: 22SEP2019 07:32:33  15.4S  173.1W Mw=5.6  EMSC   TONGA                        

P: 25SEP2019 118961    15.0S  174.0W 4.0-5.3 BAAAA  Samoa Islands               

 

STRONG SWARM DAMAGING IN ALBANIA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 21, 2019

 

A series of moderate to moderately large earthquake were widely felt in Albania today. The mainshock of M 5.6 was reported with moderate damage in Albania with intensity VIII in Rrogozhine; VII in Durres, Kavaje; VI in Shijal, Vore, and Tirana with lesser shaking within about 200 km of the epicenter. An aftershock about 11 minutes after the mainshock was felt with maximum intensity V in a similar area within aboutg 200 km of the epicenter. An M 4.4 aftershock was reported felt with intensity VI in Albania at Kamze and IV in Tirana and II in Durres. The M 4.8 and M 4.7 aftershocks were felt with intensity VI in Albania at Kavaje; V in Kamze; IV in Tirana and Shijak Durres and II-III in Durras, Librazhd, and Vlore and in Djakovica Serbia and Montenegro. Preliminary reports and pictures on the web indicated considerable damage in Durres and Tirana with at least 68 injured and hospitalized. In Tirana 48 houses and three apartment buildings were damaged in Durres 42 houses and four apartment buildings were damaged or cracked according to government sources. Twenty buildings were damaged elsewhere in Albania. There no reports of and deaths associated with the quake. Most of the injuries apparently occurred as people fled their homes. At least two buildings were evacuated.

 

A series of moderate earthquakes hit this same region of Albania on June 1. At the time this summary noted:

 

 

"A moderate M 5.2 in Albania today was widely felt and followed by a strong aftershock series and at least one moderate foreshock. The mainshock was reported felt with maximum intensity in Albania with intensity V in Korce and III in Berat and  Tirana. Intensity II-III was reported from Greece at Florina, Grevena, Ioannina, and in Macedonia at Skopje, Kicevo, Bitola, Ohrid.

The last earthquake in Albania within about 150 km of this activity with M>=5.2 was and M 6.6 on October 15, 2016 and prior to that an M 5.5 on September 6, 2009. Forecasts 116259 and 116200 had expected this activity was likely within about 50 km of today's epicenter at the end of May. It is likely related to the M 8.0 in Peru as it occurred at a distance from that event consistent with strong triggering (98 degrees). This appears to be part of the activation of the North Anatolian Fault Zone which runs through Turkey, Greece and Albania as described in the previous issue of this summary:

 

"The activation of the Anatolian Fault zone in Turkey and Greece also continued today with another moderate earthquake of M 4.1 in the Dodecanese Islands  region of Greece and Turkey. This continues enhanced activity over the  past several days in the area." (May 30-31, 2019)

 

The 103 distance from Peru "passes through the epicenter of the M 6.1 in the Andreanof Islands which occurred about a day before Peru; through the Komandorsky Islands of Russia, south to the Tonga-Fiji arc and through New Zealand where a moderate to large earthquake could be promoted in the near term. In the east it passes along the East African Rift north to western Turkey and the Anatolian region." (May 26-27, May 29-30, 2019, June 1, 2019)

 

Today's epicenters are near 100 degrees from the M 7.1 in Southern California of July 6 and may also have been promoted from that source. The last earthquake in Albania within about 200 km of today's epicenter with M>=5.8 was an M 6.3 on August 14, 2003.

Earthquake hit this area on May 13, 1995 (M 6.6) September 1, 1994 (M 5.8) and December 21, 1990 (M 6.1). Forecast 118711 had expected today's activity in this area was likely around September 17.

 

O: 21SEP2019 14:15:52  41.2N   19.5E mb=5.2  EMSC   ADRIATIC SEA                 

O: 22SEP2019 00:28:12  41.3N   19.5E mb=4.4  EMSC   ALBANIA                      

O: 21SEP2019 16:10:38  41.4N   19.4E mb=4.7  EMSC   ADRIATIC SEA                 

O: 21SEP2019 22:07:31  41.4N   19.4E mb=4.8  EMSC   ADRIATIC SEA                 

O: 21SEP2019 14:04:25  41.4N   19.4E mb=5.6  EMSC   ADRIATIC SEA                 

P: 17SEP2019 118711    40.0N   21.0E 3.0-4.9 BBAAA  Romania/NW Turkey          

 

An earthquake of M 4.7 was also felt in southern Italy today in the middle of the Albanian series and was probably a regional aftershock of those events. This is the strongest earthquake in southern Italy within about 100 km of this epicenter since an M 5.3 more than a year ago on August 16, 2018 and before that an M 5.8 on October 28, 2016. Forecast 118654 gad expected activity in this are in mid-September.

 

O: 21SEP2019 19:55:48  40.4N   15.0E mb=4.7  EMSC   SOUTHERN ITALY                

P: 14SEP2019 118654    38.0N   14.0E 3.0-4.3 CCAAA  Mediterranean/Sicily       

 

The largest earthquake in the world today was an M 5.9 in the Banda Sea, Indonesia. It was reported felt with intensity II-III in Northern Territory, Australia at Coonawarra and Darwin. The last earthquake of M>=5.9 in the Banda Sea within about 200 km of this epicenter occurred on June 24, 2019 (M 7.3) and prior to that an M 6.4 on December 1, 2018. While not at deep or intermediate focus such as these two previous events, today's quake is probably a regional aftershock of the M 7.3 on June 24.  Forecasts 118605 and 118591 had expected activity in the Banda Sea within  about 100 km of this epicenter was likely around September 16-20.

 

O: 21SEP2019 20:09:36   6.5S  130.6E ML=4.2  EMSC   BANDA SEA                    

O: 21SEP2019 19:53:14   6.6S  130.5E Mw=5.9  EMSC   BANDA SEA                    

O: 21SEP2019 23:11:37   6.6S  130.7E mb=4.2  EMSC   BANDA SEA                    

P: 16SEP2019 118605     7.0S  130.0E 4.0-5.5 BAAAA  West Irian, PNG            

P: 20SEP2019 118591     6.0S  128.0E 4.0-5.4 AACAA  Banda Sea                  

 

The strongest activity in the U.S. or Canada today was a swarm of moderate earthquakes in the Rat Islands, Aleutians. The strongest of these was an M 4.7 and was followed by aftershocks of M 4.3 and 4.2. The Rat Islands are an active zone and see earthquakes of M>=4 nearly weekly. The last in the Rat Islands within about 150 km of today's epicenter with M>=4.7 occurred April 14, 2019 with M 5.3. Forecast 118729 had expected today's event within about 25 km of the epicenter was likely around September 17.

 

O: 21SEP2019 23:30:39  51.0N  179.0E mb=4.3  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 22SEP2019 00:24:20  51.1N  179.0E mb=4.2  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

O: 21SEP2019 23:00:47  51.1N  179.1E mb=4.7  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 17SEP2019 118729    51.0N  179.0E 4.0-5.5 AAAAA  Rat Islands                

 

QUIET SEISMIC CONDITIONS MAY END WITH ARRIVAL OF EQUINOX

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 20, 2019

 

The quiet seismic conditions in the world which have prevailed through most of the summer months may come to an end soon. With the arrival of the September equinox, differences in temperature between land masses and ocean increase. This can promote strong storms along coastlines, which in turn can promote seismicity along coastlines. The period of August through the end of September often sees quiet global seismicity with the exception of an occasional major earthquake related to other promotional factors.

 

The last earthquake in the world of M>=7 occurred more than two months ago on July 14, 2019 in the region of Halmahera with M 7.3. The only similar event in the past three months at shallow focus was the M 7.1 in Central California in the  Ridgecrest area. Aftershocks from this event continue daily and far-field promotion form this epicenter has been common over the past 2.5 months and has included moderate events near 103 degrees in Gansu, Xinjiang, China, Central Turkey, Mindanao, Papua New Guinea, East of Australia, Azerbaijan, Crete, Albania, Turkey, Hindu Kush, Taiwan, Northern Territory, Australia, Yunnan, Northern Philippines, Assam, India, Snares, South Island, New Zealand, Crete, Iraq, Halmahera, Tajikistan, Iran, Hindu Kush, Molucca Sea, Philippines, Northern Australia, Papua, New Guinea, Pacific-Antarctic Ridge. Since 1990 approximately 40 earthquakes of M>=7.3 have occurred in winter months; 70 in autumn; 50 in Spring and 40 in Summer. 

 

Seismicity around the world today was quiet. The strongest earthquakes of the day occurred in the region of Tonga/Fiji with M 5.1, 5.0 and 5.3. Quakes in this area at this magnitude range are common. The largest quake in the world today was an M 5.7 in Central Vanuatu. It was not reported felt in this area. The last earthquake within about 150 km of this epicenter in Vanuatu with M>=5.7 occurred on August 6, 2019 with M 5.9 and prior to that as an M 5.7 on October 2, 2018.  Forecast 118763 had expected today's event was likely around September 20 to the

south of this epicenter.

 

O: 20SEP2019 18:20:11  17.4S  167.0E Mw=5.7  EMSC   VANUATU                      

P: 20SEP2019 118763    19.0S  168.0E 4.0-5.3 ABAAA  Vanuatu Islands            

 

O: 20SEP2019 08:00:14  18.1S  172.1W mb=5.0  EMSC   TONGA REGION                 

O: 20SEP2019 09:13:39  18.3S  172.5W Mw=5.3  EMSC   TONGA REGION                 

O: 20SEP2019 09:19:12  18.3S  172.5W mb=5.1  EMSC   TONGA REGION                 

P: 20SEP2019 118761    19.0S  173.0W 4.0-5.5 AAAAA  Tonga Islands              

 

Other than an M 3.3 in the Salton Sea area of southern California no significant activity was noted in the U.S. or Canada today. NEIC reported this earthquake of M 3.1 near Borrego Springs, California was felt with intensity II-III in the area(s) of California at Ranchita, Borrego Springs, La Quinta, Palm Desert, Julian, Vista, Hemet and San Diego. This continues a swarm in the area which has been ongoing for several days. Forecast 118669 had expected regional activity around September 19.

 

O: 20SEP2019 09:47:43  33.3N  116.4W ML=3.3  EMSC   SOUTHERN CALIFORNIA          

P: 19SEP2019 118669    33.9N  116.9W 2.5-4.4 AAAAA  So. California             

 

 

 

 

STRONG EARTHQUAKE TRIPLET SHAKES JAVA, INDONESIA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 19, 2019

 

A series of three strong earthquakes of M 5.9, 6.0 and 6.2 at a deep focus shook the region of Java, Indonesia today. These events were reported by NEIC to have been felt in Java at Rembang, Madiun, Surakarta, Ponorogo, Gondanglegi, Yogyakarta and in Bali at Negara, Ubud, Denpasar and Kuta. No major damage was reported due to the depth of these earthquakes and the distance from populated areas. The last earthquake within about 300 km of this epicenter south of Java with M>=6.2 occurred as events of M 6.3 on May 26, 2006 and May 25, 2001.  Forecast 118760 had expected activity south of Java was likely around September 18.

 

O: 19SEP2019 07:32:58   6.0S  111.9E Mw=5.9  EMSC   JAVA, INDONESIA              

O: 19SEP2019 07:32:00   6.0S  111.9E Mw=6.0  EMSC   JAVA, INDONESIA              

O: 19SEP2019 07:06:33   6.0S  111.9E Mw=6.2  EMSC   JAVA, INDONESIA              

P: 18SEP2019 118760    10.0S  109.0E 4.0-5.3 ACCAA  So. of Java                

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 in Southern California. This continues a swarm in the area which began two days ago. This summary had noted in this regard at the time:

 

 

"An earthquake of M 3.6-3.8 hit near the Salton Sea in Southern California today. This is an unusual epicenter at this time.  NEIC reported this earthquake of M 3.8 in Southern California was felt with intensity V in Niland and IV in Desert Center and El Centro, California and II-III in the area(s) of Southern California in Thermal, La Quinta, Palm Desert, Rancho Mirage, Escondido.

It is the largest earthquake within about 50 km of this epicenter since an M 3.9 on January 17, 2019 and prior to that the day before the Anchorage, Alaska mainshock on November 29, 2018 with M 3.9. The relation to the strongest aftershock today in the Anchorage, Alaska area since the mainshock on November 30, 2018 is not known. Forecast 118668 had expected today's event in this area was likely to occur around September 15." (September 17, 2019)

 

 

NEIC reported this earthquake of M 3.6 in Southern California  was felt with intensity II-III in the area(s) of Southern California at Niland, Mecca, Thermal and Palm Desert. Forecast 118668 expected today's event was likely south of this epicenter around September 21.

 

O: 19SEP2019 09:59:46  33.4N  115.8W ML=3.7  EMSC   SOUTHERN CALIFORNIA          

O: 19SEP2019 21:47:57  33.4N  115.8W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

O: 20SEP2019 02:09:53  33.4N  115.8W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

O: 19SEP2019 10:08:03  33.4N  115.8W Ml=2.3  EMSC   SOUTHERN CALIFORNIA          

P: 21SEP2019 118668    32.8N  115.6W 2.5-4.3 AAAAA  So. California             

 

ENHANCED SEISMICITY CONTINUES IN MINDANAO, PHILIPPINES

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 18, 2019

 

The strongest earthquakes in the world today occurred near 120 degrees East longitude with an M 5.5 in Mindanao followed by several moderate aftershocks.  This activity is probably related to tidal stresses which maximized in this longitude zone with the full moon of September 14 as noted in previous summaries:

 

"The full moon arrives at 04:33 UT on September 14. Longitudes which are anti-solar at this time (at local solar midnight) are located near 67 West longitude while those which are sub-solar are near 113 East longitude. The most likely tidal trigger for this alignment is in Indonesia, the Philippines and western Japan in the east and in Puerto Rico, the Dominican Republic and the western coast of South America in the west. A strong earthquake in South America or Indonesia is likely in the next five days. While these are the most likely areas to see tidal triggering at this time, such seismic promotion can occur in many areas. A strong to major earthquake related to tidal triggering is considered likely in mid-September.  Such earthquakes are most likely near local solar noon and local solar midnight when tidal stresses are maximized in the earth." (September 13-16, 2019)

 

This appears to be continuing activity following events of M 5.5-5.6 on September 10, August 2 and July 9,, 2019. The last of significantly larger magnitude within about 200 km of this epicenter was an M 6.1 on May 31, 2019.

Forecast 118587 had expected today's activity in this region was likely around September 16-18.

 

O: 18SEP2019 12:04:03   5.4N  126.3E mb=4.7  EMSC   MINDANAO, PHILIPPINES        

O: 18SEP2019 10:42:02   5.4N  126.4E ML=4.3  EMSC   MINDANAO, PHILIPPINES        

O: 18SEP2019 07:00:58   5.5N  126.6E Mw=5.5  EMSC   MINDANAO, PHILIPPINES        

P: 16SEP2019 118587     7.0N  127.0E 4.0-5.3 ABAAA  Halmahera                  

P: 18SEP2019 118587     4.0N  126.0E 4.0-5.3 ABAAA  Mindanao, Philippines      

 

Seismicity at the opposite longitude (around 65W) also continued at elevated

levels today with an M 4.5 in the Dominican Republic. NEIC reported this earthquake of M 4.5 in the Dominican Republic was felt with intensity V in Cabrera Maria Trinidad and IV in Arroyo Salado Maria, Dominican Republic and II-III in the area(s) of the Dominican Republic at Nagua, Santo Domingo and El Carril.  This area has been active over the past several days with the last events of M>=4.5 on July 28, 2019 with M 4.7 about 150 km southeast of today's epicenter. Forecast 118627 had expected today's activity was likely around September 20.

 

O: 18SEP2019 19:34:52  19.5N   69.9W mb=4.5  EMSC   DOMINICAN REPUBLIC           

P: 20SEP2019 118627    20.0N   69.0W 3.0-4.4 AAAAA  Bahamas/No. Caribbean       

 

The strongest earthquake in the U.S. or Canada today was an M 3.5 in the central Andreanof Islands, Aleutians, Alaska. It was not reported felt in this active, but remote, area. Earthquake of M>=3.5 are common in this area and two events of M>5.2 have hit the area in the past week. Forecast 118720 had expected today's event was likely around September 20.

 

O: 18SEP2019 14:28:00  51.6N  175.3W ml=3.5  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 20SEP2019 118720    50.8N  175.8W 3.5-4.9 AAAAA  Andreanoff Isls, Aleutians 

 

The activity in the Andreanof Islands followed a near-antipodal earthquake of

M 5.4 in the Bouvet Island region of the South Atlantic. Today's event was not reported felt in this remote oceanic area. Antipodal events often occur when a moderately strong to strong quake occurs in the Bouvet Island area.  The last earthquake in the Bouvet Island region within about 250 km of this epicenter with M>=5.4 occurred January 28, 2018 with M 6.6. Today's event occurred within half an hour of local solar midnight and was probably promoted by tidal stresses associated with the full moon.

 

O: 18SEP2019 11:54:58  54.3S    7.9E mb=5.4  EMSC   BOUVET ISLAND REGION         

 

An M 3.1 in the Parkfield, California area occurred today.  NEIC reported this earthquake of M 3.1 in Central California was felt with intensity II-III in the area(s) of San Miguel and Atascadero, Central California. The last earthquake of M>=3.1 in the Parkfield area was an M 3.1 on July 24, 2019 and the last of larger magnitude was an M 3.5 on April 5, 2019. The infamous 22-year cycle for large repeating events in the Parkfield area - supposedly in 1966, 1988, 2010 is nowhere near complete (unless this is an 11-year periodicity) at this point so a strong quake is unlikely in this area in the near future. Forecast 118654 had expected today's activity around September 19.

 

O: 18SEP2019 21:45:05  35.9N  120.5W ML=3.1  EMSC   CENTRAL CALIFORNIA           

O: 18SEP2019 05:08:42  35.6N  120.8W Md=2.2  EMSC   CENTRAL CALIFORNIA           

P: 19SEP2019 118645    36.2N  120.8W 2.5-4.3 AAAAA  Central California         

 

A moderate earthquake of M 4.1 off the western coast of Mexico in the Revilla Gigedo Islands today may have been promoted by a tropical cyclone. A series of storms is currently raging south of Mexico. The largest of these, Hurricane Lorena passed near this epicenter today. Forecast 118629 expected today's event within about 100 km was likely around September 21.

 

"Hurricane Lorena continued south of Michoacan, Mexico today with winds up to 80 kts.  It may impact western Mexico later in the week enhancing seismicity in the regions of Michoacan, Jalisco and the Gulf of California.." (September 18-19, 2019)

 

O: 18SEP2019 07:38:43  19.5N  108.0W ML=4.1  EMSC   REVILLA GIGEDO ISLANDS REGION

P: 21SEP2019 118629    20.0N  109.0W 3.5-4.8 BAAAA  Gulf of California         

 

MODERATE QUAKE IN AZORES

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 17, 2019

 

 

The strongest earthquake in the world today was an M 5.4 in the Azores, North Atlantic. It was not reported felt in this region. It was the strongest within about 200 of this epicenter since an M 6.3 on May 25, 2010. More recently the area within about 250 km of this epicenter saw events of M 6.2 on February 14, 2019 and M 5.4 on January 31, 2017 and August 13, 2010. Forecast 118660 had expected today's event within about 250 km of this epicenter was likely around September 18.

 

O: 17SEP2019 13:51:33  36.2N   34.0W Mw=5.4  EMSC   AZORES ISLANDS REGION        

P: 18SEP2019 118660    38.0N   32.0W 4.0-5.3 ABBAA  No. Mid-Atlantic Ridge     

 

M 5.2 IN ANCHORAGE, ALASKA AFTERSHOCK ZONE LARGEST SINCE MAINSHCOK LAST YEAR

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 16, 2019

 

The strongest earthquake in the U.S. or Canada today was an M 5.2 in the Anchorage, Alaska aftershock zone. Today's event was reported by NEIC to have been felt with intensity IV in Alaska at Willow, Talkeetna, Anchorage, Elmendorf AFB, and II-III in Wasilla, Skwentna, Tyonel, Sterling, Soldotna, Palmer, and in general within about 250  km of the epicenter. An M 3.0 foreshock was felt with intensity III in Wasilla, Alaska. The M 5.2 is the strongest aftershock in the Anchorage, Alaska region since an M 5.2 on December 1, 2018 - part of the immediate aftershocks of the M 7.0 mainshock of November 30, 2018. Prior

to that the area had not seen an M>=5.2 event since June 24, 2015 when an M 5.7 occurred. Forecast 118738 had expected today's earthquake was likely around September 13. This epicenter is at 103 degrees from the M 6.8 in Sumatra of August 2, the last major earthquake in the world, and may have been promoted from that source.

 

 

O: 17SEP2019 01:09:54  61.7N  150.8W Mw=5.2  EMSC   SOUTHERN ALASKA              

P: 13SEP2019 118738    61.2N  151.2W 3.2-4.8 BAAAA  Central Alaska             

 

An earthquake of M 3.6-3.8 hit near the Salton Sea in Southern California today. This is an unusual epicenter at this time.  NEIC reported this earthquake of M 3.8 in Southern California was felt with intensity V in Niland and IV in Desert Center and El Centro, California and II-III in the area(s) of Southern California in Thermal, La Quinta, Palm Desert, Rancho Mirage, Escondido.

It is the largest earthquake within about 50 km of this epicenter since an M 3.9 on January 17, 2019 and prior to that the day before the Anchorage, Alaska mainshock on November 29, 2018 with M 3.9. The relation to the strongest aftershock today in the Anchorage, Alaska area since the mainshock on November 30, 2018 is not known. Forecast 118668 had expected today's event in this area was likely to occur around September 15.

 

O: 16SEP2019 18:11:51  33.4N  115.8W Mw=3.6  EMSC   SOUTHERN CALIFORNIA          

O: 16SEP2019 18:11:51  33.4N  115.8W Mw=3.8  ANSS   SOUTHERN CALIFORNIA          

P: 15SEP2019 118668    33.0N  115.9W 2.5-4.3 AAAAA  So. California             

 

An M 3.9 also occurred today in Kansas. Stronger earthquakes in this region often occur near times of full and new moons as previously noted in this summary. Today's event was widely felt with maximum intensity given by NEIC as IV in Kansas at Strong City, Lincolnville, and Marion and II-III in Burdick, Lost Springs, Herington, Council Grave, Burns, Emoria, and Cassoda.  The M 3.9 occurred within about an hour of local solar midnight and may have been enhanced by tidal stresses which maximize at this hour. The last earthquake within about 150 km of this epicenter in Kansas occurred with the last full moon as an M 4.2 and M 4.1 on August 16 and 18, 2019. At the time this summary noted the coincidence with the full moon as:

 

"As often occurs, Oklahoma saw enhanced seismic activity today with the strongest in a series of events of M 3.4. It is common for the area to become activated at times of full moons when tidal forces are strong and can affect ground water significantly. At M 3.4, this is the strongest earthquake within about 100 km of this epicenter since an M 3.4 on February 28 and an M 3.8 on February 26, 2019. Forecast 115982 had expected today's activity was likely within about 100 km of these epicenters around May 17." (May 16-17, August 17, 2019)

 

Today's earthquake is the largest within about 100 km of today's epicenter  in at least 30 years. Forecasts 118680 and 118681 had expected moderate activity in this region of Kansas in mid-September.

 

O: 16SEP2019 14:59:32  38.4N   96.8W mb=3.2  EMSC   KANSAS                        

O: 16SEP2019 07:37:27  38.5N   96.7W mb=3.9  EMSC   KANSAS                       

P: 13SEP2019 118680    37.0N   97.0W 2.0-3.8 BBAAA  Southern Plains            

P: 19SEP2019 118681    39.0N   99.0W 2.0-3.9 BABAA  Southern Plains             

 

The strongest earthquake in the world today was an M 5.5 on the Gansu-Qinghai border in China.  This is the strongest earthquake within about 200 km of this epicenter since earthquakes of M 5.8 and 5.8 sixteen years ago on October 25, 2003. Forecast 118676 had expected today's event in China was likely around September 15 within about 50 km of this epicenter. This epicenter, at 98 degrees from the M 7.1. in Southern California of July 6, 2019 may have been promoted from that source.

 

O: 16SEP2019 12:48:40  38.6N  100.3E mb=5.5  EMSC   GANSU-QINGHAI BORDER REG, CHIN

P: 15SEP2019 118676    39.0N  100.0E 3.5-4.8 AAAAA  So. China                  

 

VOLCANO ISLANDS QUAKE TRIGGERED BY TD PEIPAH

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 15, 2019

 

 

The largest earthquake in the world today was a moderate earthquake of M 5.2 n the Volcano Islands of Japan today. This event occurred as the eye of TD Peipah was passing over the epicenter and was probably triggered by stresses from that storm. This summary had noted in this regard:

 

"TD Peipah (17W) continued today in the Volcano Islands with winds up to 40 kts.  It is expected to track to the north and west over the next two days. Enhanced seismicity in the Volcano Islands is likely over the next three day through September 18 with this storm. A moderate earthquake occurred today as this storm passed over the Volcano Islands." (September 14-16, 2019)

 

The last earthquake with M>=5.2 in the Volcano Islands within about 200 km of today's epicenter was an M 5.4 on March 11, 2019 and prior to that an M 5.7 on January 5, 2019, the only such events in the past year. Forecast 118628 had expected today's event was likely in this area around September 13.

 

O: 16SEP2019 00:29:31  25.9N  142.9E Mw=5.2  EMSC   VOLCANO ISLANDS, JAPAN REGION

P: 13SEP2019 118628    27.0N  141.0E 4.0-5.3 BBBAA  Bonin Islands              

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in the Rat Islands, Aleutians, Alaska. It was not reported felt in this remote area. The last event of M>=4.5 in the Rat Islands within about 200 km of this epicenter occurred on August 5, 2019 with M 4.5. The last of larger magnitude was an M 5.3 on April 14, 2019, an aftershock of an M 6.4 on April 2, 2019. Forecast 118729 had expected today's activity was likely around September 17.

 

O: 15SEP2019 18:20:06  51.7N  177.9E mb=4.5  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 17SEP2019 118729    51.0N  179.0E 4.0-5.5 AAAAA  Rat Islands                

 

The region of the Dominican Republic was active today. The largest event was an

M 4.2 but lesser events of M 3.4 and 3.4 also occurred. This may be related to tidal stresses associated with the full moon. As noted in previous issues of this summary, the tidal forecast for this full moon had read:

 

"The full moon arrives at 04:33 UT on September 14. Longitudes which are anti-solar at this time (at local solar midnight) are located near 67 West longitude while those which are sub-solar are near 113 East longitude. The most likely tidal trigger for this alignment is in Indonesia, the Philippines and western Japan in the east and in Puerto Rico, the Dominican Republic and the western coast of South America in the west. A strong earthquake in South America or Indonesia is likely in the next five days. While these are the most likely areas to see tidal triggering at this time, such seismic promotion can occur in many areas. A strong to major earthquake related to tidal triggering is considered likely in mid-September.  Such earthquakes are most likely near local solar noon and local solar midnight when tidal stresses are maximized in the earth." (September 13-16, 2019)

 

The last shallow earthquake in the Dominican Republic within about 100 km of this epicenter with M>=4.2 was an M 4.3 on May 26, 2019. Forecast 118625 had expected today's activity was likely around September 19.

 

O: 15SEP2019 12:48:19  19.1N   71.2W ML=3.4  EMSC   DOMINICAN REPUBLIC           

O: 16SEP2019 06:59:35  19.5N   69.8W ML=3.4  EMSC   DOMINICAN REPUBLIC REGION    

O: 16SEP2019 06:53:53  19.5N   69.8W ML=4.2  EMSC   DOMINICAN REPUBLIC REGION    

P: 19SEP2019 118625    18.0N   69.0W 3.4-4.9 BAAAA  Puerto Rico                

P: 19SEP2019 118625    19.0N   71.0W 3.4-4.9 BAAAA  Puerto Rico                

 

STRONG QUAKE IN HALMAHERA, INDONESIA WITH FULL MOON

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 14, 2019

 

The strongest earthquake in the world today was an M 5.9 in the area of Halmahera, Indonesia south of the Philippines. This event occurred near local solar midnight in an area where tidal stresses were expected to be high with the full moon and was consistent with tidal enhancement of the event. As published in previous summaries the tidal forecast had read:

 

"The full moon arrives at 04:33 UT on September 14. Longitudes which are anti-solar at this time (at local solar midnight) are located near 67 West longitude while those which are sub-solar are near 113 East longitude. The most likely tidal trigger for this alignment is in Indonesia, the Philippines and western Japan in the east and in Puerto Rico, the Dominican Republic and the western coast of South America in the west. A strong earthquake in South America or Indonesia is likely in the next five days. While these are the most likely areas to see tidal triggering at this time, such seismic promotion can occur in many areas. A strong to major earthquake related to tidal triggering is considered likely in mid-September.  Such earthquakes are most likely near local solar noon and local solar midnight when tidal stresses are maximized in the earth." (September 13-15, 2019)

 

The earthquake in Halmahera is the strongest within about 200 km of the epicenters since an M 7.3 on July 14, 2019 and is probably the largest aftershock of that event to date. Forecast 118602 had expected today's event to the west was likely around September 17.

 

O: 14SEP2019 16:21:28   0.9S  128.6E Mw=5.9  EMSC   HALMAHERA, INDONESIA         

O: 14SEP2019 16:37:17   1.0S  128.5E ML=4.4  EMSC   HALMAHERA, INDONESIA         

P: 17SEP2019 118602     2.0S  124.0E 4.0-5.3 BACAA  Sulawesi area              

 

The strongest earthquake in the U.S. or Canada today was an M 5.4 in the Fox Islands, Aleutians, Alaska. NEIC reported maximum intensity V in Akutan, Alaska and II-III in Unalaska, Dutch Harbor and False Pass, Alaska. This is the strongest earthquake in the Fox Islands within about 250 km of this epicenter since an M 5.9 on May 24, 2017 and prior to that an M 5.8 on October 27, 2016. It occurred near local solar midnight and may have been promoted by the tidal stresses associated with today's full moon. Forecast 118733 had expected today's event within about 100 km of this epicenter around September 17.

 

O: 14SEP2019 19:40:55  53.7N  163.9W mb=3.5  EMSC   UNIMAK ISLAND REGION, ALASKA 

O: 14SEP2019 13:25:54  54.0N  165.9W Mw=5.4  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 17SEP2019 118733    54.2N  165.0W 3.5-4.8 BAAAA  Unimak Islands, Aleutians  

 

An earthquake of M 2.9 occurred today in Pennsylvania. NEIC reported maximum intensity in Pennsylvania at Thomasville and East Berlin with II-III in Abbotstown, Spring Grove, York, Dover, New Oxford, Wellsville, Hanover. It was also reported felt in Maryland, Delaware, and Virginia. Earthquakes in this region of Pennsylvania often precede moderate to large earthquakes in southern or central California which occur hours to days later. That area is under light seismic watch for the next week. The last earthquake in this area within about 100 km of this epicenter occurred on June 13, 2019 before the major activity in southern California in early July, 2019 and may have been precursory to that activity. Earthquakes of M>=2.9 prior to that occurred in Pennsylvania on January 17, 2016 and July 16, 2010. The largest event in the region recorded in recent history was an M 4.6 on January 16, 1994 shortly before the Northridge, California M 6.7. Forecast 118653 had expected activity in this region of the northeast U.S. around September 20.

 

O: 15SEP2019 01:11:08  39.9N   76.9W mb=2.9  EMSC   PENNSYLVANIA                  

P: 20SEP2019 118653    37.0N   77.0W 2.0-3.9 BCAAA  Kentucky/Tennessee/NC      

 

An earthquake of M 3.5 occurred south of Los Angeles, California today. NEIC reported it was felt with intensity II-III in California at Sunset Beach, Huntington Beach, San Pedro, Long Beach, Seal Beach and other area within about 75 km of the epicenter. The last earthquake within about 75 km of this epicenter with M>=3.5 in the San Pedro Channel, California occurred as an M 3.7 on October 26, 2017 nearly two years ago. Forecasts 118671 and 118670 had expected today's event was likely within about  50 km of this epicenter between September 13 and 15.

 

O: 14SEP2019 09:48:39  33.5N  118.2W Mw=3.5  EMSC   SAN PEDRO CHANNEL, CALIFORNIA

P: 13SEP2019 118670    33.8N  117.7W 2.5-4.4 AAAAA  So. California             

P: 15SEP2019 118671    33.9N  118.3W 2.5-4.3 AAAAA  So. California             

 

FULL MOON COULD ENHANCE EQUATORIAL SEISMICITY

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 13, 2019

 

The full moon alignment occurs today. This could bring enhanced seismicity in some areas of the world as noted in this summary. Most of the areas primarily seeing stronger tidal stresses lie near the equator and could see tidal triggering at this time.

 

"The full moon arrives at 04:33 UT on September 14. Longitudes which are anti-solar at this time (at local solar midnight) are located near 67 West longitude while those which are sub-solar are near 113 East longitude. The most likely tidal trigger for this alignment is in Indonesia, the Philippines and western Japan in the east and in Puerto Rico, the Dominican Republic and the western coast of South America in the west. A strong earthquake in South America or Indonesia is likely in the next five days. While these are the most likely areas to see tidal triggering at this time, such seismic promotion can occur in many areas. A strong to major earthquake related to tidal triggering is considered likely in mid-September.  Such earthquakes are most likely near local solar noon and local solar midnight when tidal stresses are maximized in the earth." (September 12-14. 2019)

 

An earthquake of M 4.9 occurred in the Martinique region of the Windward Islands today. It was probably felt but this has not been reported. It occurred within about 30 minutes of local solar noon in a region (62 degrees West longitude) where tidal stresses were expected to be high with the full moon and was probably promoted by those stresses. This is the strongest earthquake within about 200 km of this epicenter since an M 5.4 on September 28, 2018 and prior to that an M 5.8 on February 3, 2017. Forecasts 118626 and 118613 expected today's activity in the Windward Islands was likely around September 14-20.

 

O: 13SEP2019 16:27:19  14.9N   61.6W mb=4.9  EMSC   MARTINIQUE REGION, WINDWARD IS

P: 14SEP2019 118626    11.0N   62.0W 3.4-4.9 ACAAA  Windward Islands           

P: 20SEP2019 118613    17.0N   62.0W 3.0-4.8 CCAAA  Leeward Islands            

 

An earthquake of M 4.8 shook areas of north-central Turkey today. NEIC reported maximum intensity IV in Turkey at Ankara and III in Incesu Kaysen, Turkey.

This epicenter about 200 km east of Istanbul, Turkey is the strongest in the area within about 250 km since an M 5.6 on December 26, 2007, more than 11 years ago. Forecast 118684 had expected today's activity was likely around September 19. This event is located at 99 degrees from the M 7.1 quake in Ridgecrest, California of July 6, 2019 and may have been promoted from that source.

 

O: 14SEP2019 06:00:31  40.7N   33.0E ML=4.9  EMSC   CENTRAL TURKEY               

O: 14SEP2019 06:03:10  40.8N   33.0E ML=5.1  EMSC   CENTRAL TURKEY               

P: 19SEP2019 118684    39.0N   31.0E 3.5-4.9 BBBAA  Turkey                     

 

The strongest earthquake in the world today was an M 5.4 in Tonga/Samoa. It was not reported felt in this area. It occurred within about an hour of local solar noon and may have been enhanced by high tidal stresses. This is an active area. The last event of M>=5.4 within about 200 km of this epicenter occurred five months on April 12, 2019 with M 5.8. Forecast 118547 had expected this event within about 100 km was likely in mid-September. This event is at the fifth node (72 degrees) from the M 7.1 in Ridgecrest, California of July 6 and may have been promoted from energy from that source.

 

O: 13SEP2019 22:53:30  15.4S  173.2W mb=5.4  EMSC   TONGA                        

P:  7SEP2019 118547    15.0S  174.0W 4.0-5.3 CAAAA  Samoa Islands              

 

Two moderate earthquakes occurred today in the northern Mid-Atlantic today. These may related to Tropical Storm Humberto. The more northerly of these was an M 4.5 in the Reykjanes Ridge south of Iceland. This event occurred within minutes of local solar midnight with the full moon and was probably enhanced by tidal stresses. Forecast 118727 had expected this event within about 50 km around September 15.

 

The other was also probably enhanced by tidal stresses. This event of M 4.9 occurred north of the Azores within about 30 minutes of local solar noon, a time when tidal stresses maximize. Forecast 118500 had expected this event was likely around  September 7 within about 150 km of the epicenter.

 

O: 13SEP2019 14:12:29  43.6N   28.9W mb=4.9  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P:  7SEP2019 118500    42.0N   29.0W 4.0-5.3 CBAAA  No. Mid-Atlantic Ridge     

 

O: 14SEP2019 02:48:50  54.7N   35.2W mb=4.5  EMSC   REYKJANES RIDGE              

P: 15SEP2019 118727    54.0N   35.0W 4.0-5.3 AAAAA  North Mid-Atlantic Ridge   

 

The strongest earthquake in the U.S. or Canada today occurred in Southern Idaho with M 3.4.  NEIC reported this earthquake of M 3.3 in Southern Idaho  was felt with intensity II-III in the area(s) of Southern Idaho in Montpelier and possibly in Laramie, Wyoming.  The last earthquake of M>=3.4 in southern Idaho within about 50 km of this epicenter occurred November 15, 2018 and prior to that as an M 4.3 on January 26, 2018. Today's event may be an aftershock of the January, 2018 quake. Forecast 118717 had expected today's event was likely around September 12.

 

O: 13SEP2019 17:34:56  42.5N  111.2W Ml=3.4  EMSC   SOUTHERN IDAHO               

P: 12SEP2019 118717    43.2N  111.0W 2.0-3.8 AAAAA  Yellowstone/Wyoming        

 

CENTRAL CALIFORNIA SEES TWO ACTIVE SWARMS

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 12, 2019

 

A light earthquake of M 3.8 occurred today in Central California south of San Francisco and was preceded by an M 3.4 foreshock. The M 3.8 may have been promoted by tidal stresses associated with the full moon as it occurred within about an hour of local solar midnight.  NEIC reported this earthquake of M 3.8 in Central California  was felt with intensity II-III in the area(s) of Central California at Gonzales, Soledad, Paicines, Hollister, Salinas, Carmel Valley, Greenfield, King City and Castroville. The foreshock of M 3.4 was felt in Paicines and Hollister, California.  The M 3.8 is the strongest earthquake within about 50 km of today's epicenter in early a year - since an M 4.1 on November 2, 2018. This is in the creeping section of the San Andreas Fault Zone and a strong earthquake in the area is unlikely, especially since the focus was at 6 km, relatively shallow for large or moderate quakes in the area which tend to initiate near the brittle-ductile transition nearer 10-12 km. Forecasts 118449 and 118646  had expected a possibly moderate quake in this area was possible around September 9-12.

 

O: 13SEP2019 04:28:36  36.6N  121.2W Md=2.6  EMSC   CENTRAL CALIFORNIA

O: 13SEP2019 03:59:52  36.6N  121.2W ML=3.4  EMSC   CENTRAL CALIFORNIA

O: 12SEP2019 22:29:12  36.8N  121.6W Md=2.0  EMSC   CENTRAL CALIFORNIA

O: 13SEP2019 06:50:21  36.6N  121.2W Mw=3.8  EMSC   CENTRAL CALIFORNIA           

O: 12SEP2019 22:08:08  36.6N  121.3W Md=2.6  EMSC   CENTRAL CALIFORNIA           

P:  9SEP2019 118449    36.4N  121.0W 2.5-4.3 BAAAA  Central California         

P: 12SEP2019 118645    36.6N  120.7W 2.5-4.3 AAAAA  Central California         

 

A strong series of light earthquakes with maximum magnitude M 3.0 also occurred today in California in the Mammoth Lakes area near the Nevada border. The last earthquake of M>=3 in the Mammoth Lakes region occurred following the M 7.1 Ridgecrest mainshock of July 6 on July 9, 2019 with M 3.0. The last of M>3 also was associated with that mainshock and occurred July 7, 2019 with M 3.3. Forecast 118640 had expected today's activity was likely around September 13.

 

NEIC reported these earthquakes of M 2.5-3.0 in the Long Valley California area were felt with intensity II-III in the area(s) of Mammoth Lakes, California.

 

O: 13SEP2019 05:26:17  37.6N  118.9W Md=2.0  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 13SEP2019 04:18:42  37.6N  118.9W Md=2.5  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 13SEP2019 03:44:32  37.6N  118.9W Md=2.5  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 13SEP2019 03:42:40  37.6N  118.9W Md=2.2  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 13SEP2019 03:36:33  37.6N  118.9W Ml=2.8  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 13SEP2019 03:22:11  37.6N  118.9W Md=2.4  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 13SEP2019 03:07:45  37.6N  118.9W Md=2.0  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 13SEP2019 03:06:49  37.0N  118.1W ml=2.0  EMSC   CENTRAL CALIFORNIA

O: 13SEP2019 03:05:39  37.6N  118.9W Md=2.6  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 13SEP2019 02:55:49  37.6N  118.9W Md=2.1  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 13SEP2019 02:52:55  37.6N  118.9W Md=3.0  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 13SEP2019 02:35:38  37.6N  118.9W Md=2.2  EMSC   LONG VALLEY AREA, CALIFORNIA

O: 13SEP2019 03:58:34  37.6N  118.9W Md=2.1  EMSC   LONG VALLEY AREA, CALIFORNIA 

P: 13SEP2019 118640    37.3N  118.3W 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 Bering Sea north of the Andreanof Islands, Aleutians. This is the strongest earthquake within about 200 km of this epicenter in the Bering Sea since a similar M 3.9 more than a year ago on August 29, 2018. The last event of greater magnitude in the region was an M 4.3 on January 1, 2017. Forecast 118721 had expected regional activity was likely in mid-September.

 

O: 13SEP2019 00:38:45  54.3N  173.9W mb=3.9  EMSC   BERING SEA                   

P: 18SEP2019 118721    51.1N  175.8W 3.5-4.9 BCAAA  Andreanoff Isls, Aleutians 

 

An earthquake of M 4.8 occurred southwest of Africa near the antipode of the Bering Sea earthquake earlier in the day. It was not reported felt in the epicentral zone. The last earthquake within about 250 km of this epicenter with M>=4.8 was an M 5.1 on March 19, 2019. Antipodal events are not uncommon in these two regions.

 

O: 12SEP2019 08:48:42  52.6S   12.8E mb=4.8  EMSC   SOUTHWEST OF AFRICA          

O: 12SEP2019 08:48:42  52.6S   13.2E mb=5.0  ANSS   SOUTHWEST OF AFRICA          

 

LIGHT EARTHQUAKES FELT IN EASTERN U.S.

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 11, 2019

 

A series of light earthquakes occurred in eastern U.S. today. These included

an M 3.8 in Arkansas; an M 2.3 in North Carolina, an M 2.4 in Southeastern Missouri and an M 2.0 in New York State.

 

The unusual earthquake of M 3.7-3.8 in the area of Arkansas was reported by NEIC with maximum intensity IV in Arkansas in Big Flat, Norfold, Flippin, Onia and II-III in Hamet, Calico Road, Cotter, Fifty Six, Gassville and Mountain Home, Arkansas among others. It was also reported felt as far as Louisiana, Texas, Illinois, Kansas, Tennessee, Iowa and up to 1000 km from the epicenter.  This is the strongest earthquake within about 200 km of this epicenter in Arkansas since an M 3.8 on June 4, 2014 and and M 3.9 on April 8, 2011. The strongest earthquake in the area in the past 30 years was an M 4.8 on February 28, 2011. Forecast 118656 had expected today's event to the south was likely around September 14.

 

O: 12SEP2019 06:42:22  36.1N   92.4W mb=3.8  EMSC   ARKANSAS                     

P: 14SEP2019 118656    35.0N   92.0W 2.0-3.9 ABAAA  New Madrid area            

 

The earthquake in southeastern Missouri of M 2.4-2.6 is the strongest within  about 100 km of that epicenter since an M 2.6 on June 6, 2017. The last event in the region with larger magnitude was an M 3.9 on June 7, 2011. Forecast 118656 had expected activity in this are was likely around September 15.

 

NEIC reported this earthquake of M 2.6 in Missouri was felt with intensity II-III in the area(s) of Bonne Terre, De Soto, Park Hills, Cadet, Festus, Irondale, Farmington, Sante Genevieve, Barnhart and Ironton, Missouri.

 

O: 11SEP2019 07:09:41  38.0N   90.5W mb=2.4  EMSC   SOUTHEASTERN MISSOURI        

O: 11SEP2019 07:09:41  38.0N   90.5W mb=2.6  ANSS   SOUTHEASTERN MISSOURI        

P: 15SEP2019 118656    37.0N   89.0W 2.0-3.8 BAAAA  New Madrid area            

 

The earthquake of M 2.3 in North Carolina may have been promoted by Hurricane Dorian which passed near this epicenter last week. The last earthquake within  about 100 km of this epicenter with M>=2.3 was an M 2.5 on August 18, 2019. Forecast 118653 had expected today's event in mid-September in North Carolina.

 

NEIC reported this earthquake of M 2.5 in North Carolina  was felt with intensity II-III in the area(s) of North Carolina at Bryson City, Cherokee and Charlotte. Intensity V was felt at Dobson and IV in Whittier, North Carolina.

 

O: 12SEP2019 03:03:16  35.4N   83.3W mb=2.3  EMSC   NORTH CAROLINA                

P: 20SEP2019 118653    37.0N   83.0W 2.0-3.8 CBAAA  Kentucky/Tennessee/NC      

 

The last earthquake within about 100 km of the M 2.0 in New York with equal or greater magnitude occurred on September 6, 2019 with M 2.0. The last of larger magnitude was an M 2.6 on July 27, 2019.  Forecast 118702 had expected today's activity in mid-September.

 

O: 11SEP2019 17:10:38  44.1N   75.9W ML=2.0  EMSC   NEW YORK                     

P: 17SEP2019 118702    44.0N   74.0W 2.0-3.8 CABAA  New York State              

 

The most unusual earthquake in the world today was an M 4.9 in the Red Sea, continuing elevated seismicity in eastern Africa which has persisted since the geomagnetic storm began in early September. It was not reported felt in this remote area. A similar M 4.9-5.0 quake hit about 150 km north of this on March 6, 2019 but the last event within this area of larger magnitude was an M 5.0 on September 18, 2013. Forecast 118408 had expected activity in this area south of this around September 8.

 

O: 11SEP2019 19:06:56  16.5N   40.1E mb=4.9  EMSC   RED SEA                      

P:  8SEP2019 118408    13.0N   40.0E 3.5-4.8 CCAAA  Ethiopia                   

 

The strongest earthquake in the world today was an M 5.5 in the area south of the Fiji Islands. It was not reported felt in this area. The last earthquake of M>=5.5 within about 250 km of this epicenter occurred on June 18, 2019 (M 5.5) while the last of larger magnitude was an M 6.5 a year ago on September 16, 2018. Forecast 118774 had expected this activity was likely around September 13.

 

O: 11SEP2019 17:51:54  25.5S  178.3E Mw=5.5  EMSC   SOUTH OF FIJI ISLANDS        

O: 11SEP2019 23:11:50  25.8S  179.5E mb=4.9  EMSC   SOUTH OF FIJI ISLANDS        

P: 13SEP2019 118774    23.0S  179.0E 4.0-5.3 ACAAA  Tonga/Fiji                 

 

MODERATELY STRONG QUAKE OFF SOUTHEASTERN ALASKA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 10, 2019

 

The strongest seismicity in the world today again was concentrated at high latitudes and near the equator. The largest event was an M 5.7 in Halmahera, Indonesia south of Mindanao but it was about the same size as an M 5.7 off the west coast of Southeastern Alaska.

 

The strongest earthquake in the U.S. or the world today was an M 5.7 off the coast of southeastern Alaska. NEIC reported it was lightly felt with intensity I-II in southeastern Alaska at Gustavus, Sitka, Yakutat, Haines, Douglas, Juneau. A foreshock of M 3.6 in Alaska was felt with intensity II-III in Haines, Skagway, Elfin Cove and Douglas, Alaska. The mainshock occurred within about half an hour of local solar noon and tidal forces, which maximize at this hour, may have helped trigger this event. The area has been active for more than a month - an active period which may have begun in early July with a strong regional activation which preceded the M 7.1 in Ridgecrest, California on July 6 when an M 4.3 occurred on July 4, 2019. Earthquake of M 5.0 on September 1 and M 4.5 on September 8, 2019 preceded today's events. This is the largest earthquake within about 200 km of this epicenter in the past 30 years. An M 6.3 hit the area within about 300 km of this epicenter on May 1, 2017, the largest earthquake in that area in the past 30 years. An M 4.6 hit the area about 300 km to the northwest of this on September 8, 2019. Forecast 118528 had expected today's event was likely within about 100 km of the Canadian epicenter around September 9.  This activity is located at 106 degrees from the M 6.8 in Central Chile of August 1 and may have been promoted by energy from that source.

 

O: 10SEP2019 20:32:12  57.1N  139.7W Mw=5.7  EMSC   OFF COAST OF SOUTHEASTERN ALAS

O: 10SEP2019 20:32:24  57.6N  137.0W MB=5.7  ECAN OF JUNEAU, AK                  

O: 10SEP2019 22:42:27  56.3N  139.9W ml=3.0  EMSC   OFF COAST OF SOUTHEASTERN ALASKA

O: 10SEP2019 20:40:34  56.9N  139.7W ml=3.4  EMSC   OFF COAST OF SOUTHEASTERN ALASKA

P:  9SEP2019 118528    58.0N  136.0W 3.0-4.3 AAAAA  Southeast Alaska           

P:  9SEP2019 118528    58.0N  136.0W 3.0-4.3 AAAAA  Southeast Alaska           

 

An unusual earthquake of M 5.0 also occurred today east of the South Sandwich Islands at high latitude (59 South). It was not felt in this remote epicentral area. This is the strongest earthquake within about 250 km of this epicenter since an M 5.3 on November 15, 2017.

 

O: 10SEP2019 09:53:00  58.9S   16.3W mb=5.0  EMSC   EAST OF SOUTH SANDWICH ISLANDS

 

The M 5.6 in the Talaud Islands, Indonesia occurred south of the similar event in southern Mindanao, Philippines yesterday. It continues equatorial seismicity which has been high in early September, 2019. This is the strongest earthquake within about 200 km of this epicenter since an M 6.6 on January 6, 2019. An M 7.0 hit about 200 km north of this on December 29, 2018. Forecast 118380 had expected this event was likely within about 100 km of the epicenter around September 9. This activity is located at 144 degrees from the M 6.8 in Central Chile of August 1 and may have been promoted by energy from that source.

 

O: 10SEP2019 23:44:49   3.7N  126.8E ML=4.2  EMSC   KEPULAUAN TALAUD, INDONESIA

O: 11SEP2019 05:10:37   3.8N  126.8E ML=4.3  EMSC   KEPULAUAN TALAUD, INDONESIA

O: 11SEP2019 00:51:14   4.0N  126.8E ML=4.1  EMSC   KEPULAUAN TALAUD, INDONESIA

O: 11SEP2019 00:36:05   4.0N  126.9E ML=4.1  EMSC   KEPULAUAN TALAUD, INDONESIA

O: 10SEP2019 23:46:05   4.2N  126.8E mb=4.6  EMSC   KEPULAUAN TALAUD, INDONESIA

O: 10SEP2019 23:57:38   4.5N  126.9E ML=4.1  EMSC   KEPULAUAN TALAUD, INDONESIA

O: 10SEP2019 23:32:25   4.1N  126.7E Mw=5.6  EMSC   KEPULAUAN TALAUD, INDONESIA  

P:  9SEP2019 118380     4.0N  126.0E 4.0-5.3 AAAAA  Mindanao, Philippines      

 

The area of the M 7.1 Ridgecrest earthquake of July 6, 2019 continued active today. Lightly felt aftershocks in this zone have been felt almost daily since the mainshock. An earthquake of M 3.6 hit the are on September 8 and was lightly felt in the Ridgecrest area. Forecast 118477 expected this activity would continue around September 11.

 

O:  8SEP2019 14:07:23  35.6N  117.4W Mw=3.6  EMSC   SOUTHERN CALIFORNIA          

O: 10SEP2019 11:43:41  35.7N  117.6W Ml=2.7  EMSC   SOUTHERN CALIFORNIA          

O: 10SEP2019 12:36:25  35.9N  117.7W Ml=2.5  EMSC   CENTRAL CALIFORNIA           

O: 10SEP2019 15:45:39  35.9N  117.7W Ml=2.7  EMSC   CENTRAL CALIFORNIA           

O: 10SEP2019 12:34:00  35.9N  117.7W Ml=2.9  EMSC   CENTRAL CALIFORNIA           

P: 11SEP2019 118477    35.9N  117.7W 2.5-4.4 AAAAA  So. California             

 

An earthquake of M 4.0 in Southern California was widely felt today. This earthquake of M 4.0 south  of Los Angeles, California was also widely felt in that region today. NEIC reported maximum intensity IV in California at Wildomar, Murrieta, Menifee, Sun City, Lake Elsinore, with lesser shaking at Temecula, and as far as about 100 km from the epicenter. This is the strongest earthquake in the southern California area bounded by 33-35N 117-119W since an M 4.4 more than a year ago on August 29, 2018 and an M 4.0 on January 25, 2018. Prior to that the last such event was an M 4.4 on December 30, 2015, so today's event is somewhat rare for the area and may represent a redistribution of regional stress following the Ridgecrest M 7.1. Forecast 118473 had expected this activity in Southern California was likely around September 11.

 

O: 10SEP2019 20:21:49  33.6N  117.3W Ml=4.0  EMSC   SOUTHERN CALIFORNIA          

P: 11SEP2019 118473    34.1N  117.4W 2.5-4.4 AAAAA  So. California             

 

ENHANCED EQUATORIAL AND HIGH LATITUDE SEISMICITY PATTERN CONTINUES

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 9, 2019

 

Seismicity near the equator continued at high levels today. The strongest earthquakes occurred in northern Venezuela and in Mindanao, Philippines with M 5.5-5.6 within about 10 degrees of the equator. Moderately strong earthquakes also continued in the Andreanof Islands (M 5.4) and at other high latitudes. This pattern is consistent with global seismicity over the past several days and is likely to continue until the current geomagnetic storm ceases. This summary described the geomagnetic storm and seismic effects in previous issues as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 14.  High latitude geomagnetic field saw minor storm conditions  with AP at 26.  This continues the most disturbance in the geomagnetic field since AP reached 76 on August 26, 2018 more than a year ago. This storm could bring enhanced seismicity near the geomagnetic equator and high latitudes in the next several days with the most likely major event around September 4-7." (September 2-9)

 

The earthquake in Southern Mindanao, Philippines was reported by NEIC to have been felt with maximum intensity VI in Southern Mindanao at Magnaga and Santa Joseta; V in Mati, Davao and IV in Canocotan, Bato, Ula, Southern Mindanao with lesser shaking within about 200 km of the epicenter at Samal, Koronadal, and Bana. The last earthquake in Mindanao within about 150 km of this epicenter with M>=5.6 was an M 5.6 on July 9, 2019. The last of stronger magnitude was an M 6.1 on May 31, 2019. Forecast 118378 had expected today's event within about 50 km  was likely around September 11. This is at 106 degrees from the M 7.1 in  Ridgecrest, California of July 6 and may have been promoted from that source.

 

O: 10SEP2019 05:39:23   6.7N  126.4E Mw=5.6  EMSC   MINDANAO, PHILIPPINES        

P: 11SEP2019 118378     7.0N  127.0E 4.0-5.3 AAAAA  Halmahera                  

 

The earthquake of M 5.5 off northern Venezuela was reported by NEIC with maximum intensity VI in Cumana and IV in Puerto la Cruz, Barcelona, Venezuela and II-III in Porlamar, Chacao, Petare, Baruta, Caracas and in Port of Spain, Trinidad and Tobago, No major damage was reported. This is the strongest earthquake within about 150 km of this epicenter in at least 30 years. Most larger events in the area occur east of the current epicenter. This includes an M 7.3 about 150 km to the east on August 21, 2018 and an M 6.1 on October 12, 2013, the last such events. Forecast 118428 had expected regional activity was likely around September 9.

 

O:  9SEP2019 18:05:19  10.6N   64.8W Mw=5.5  EMSC   OFFSHORE ANZOATEGUI, VENEZUELA

P:  9SEP2019 118428    11.0N   62.0W 3.4-5.0 AABAA  Windward Islands           

 

The strongest earthquake in the U.S. or Canada outside Alaska today was an M 4.6 in central Nevada. NEIC reported it was felt with maximum intensity V in Austin, Nevada and II-III in Fallon, Elko, Carson City and Las Vegas, Nevada. No major damage was reported. This is the first such earthquake within about 200 km of this epicenter in at least 30 years. An M 4.7 hit about 250 km northeast of this on November 23, 2003. Forecast 118448 had expected regional seismicity in early September.

 

O: 10SEP2019 04:25:55  39.5N  116.6W ml=4.6  EMSC   NEVADA                       

P:  3SEP2019 118448    39.9N  118.4W 2.5-4.4 CABAA  California/Nevada area     

 

The strongest earthquake in Alaska today was an M 5.4 in the central Andreanof Islands, Aleutians. This follows a similar earthquake reported on in the previous issue of this summary as :

 

 

"The largest earthquake in the U.S. or Canada today was an M 5.3 in the Andreanof Islands, Aleutians. This active area has been relatively quiet in recent weeks. Only two earthquakes in the western Andreanof Islands have exceed M 5.3 in the past year - an M 6.1 on May 23, 2019 and and M 5.9 on January 5, 2019." (September 8-9, 2019)

 

Forecast 118516 had expected today's event was likely around September 7.

 

O:  9SEP2019 21:24:19  50.5N  177.2W Mw=5.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  7SEP2019 118516    51.7N  175.3W 3.5-4.8 BBAAA  Andreanoff Isls, Aleutians 

 

MODERATE QUAKE IN LAKE TANGANYIKA, TANZANIA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 8, 2019

 

The strongest earthquake of the day was an M 5.5 in the Lake Tanganyika, Tanzania area. NEIC reported maximum intensity VI in Mpanda; IV in Mbera and III in Mwanza, Tanzania. It was also felt with intensity IV in Katanga, Conga (DR), in Gilega, Burundi; Kigali, Rwanda and Kampala, Uganda. This continues active conditions along the equator which have existed for the past several days. These have included a number of events in the East African Rift valley including six events of M>=4.5 since September 3, 2019. The previous such six events in the area occurred in the time period May through September, 2019  - a period of nearly four months, suggesting an increased activity of 20 times over background

in Africa near the equator in the past 6 days.

 

Today's event in Tanzania of M 5.5 is the strongest within about 200 km of this epicenter since an M 5.8 on March 28, 2007. A strong M 6.7 hit the area on December 5, 2005. Forecast 118390 had expected today's event within about 100 km of this epicenter was likely around September 11. This event is located at 105 degrees from the last great earthquake in the world - the M 8.0 in Peru of May 26, 2019.

 

O:  9SEP2019 00:38:43   6.5S   30.8E mb=5.5  EMSC   LAKE TANGANYIKA REGION, TANZAN

P: 11SEP2019 118390     6.0S   30.0E 3.0-4.5 AAAAA  Lake Victoria area         

 

Unusual seismicity also continued today at high northern latitudes. An M 4.6 south of Iceland in the Reykjanes Ridge was preceded by an unusual earthquake of M 4.1 in the Arctic Ocean north of Alaska. An M 5.3 also occurred in the western Andreanof Islands, Aleutians. None of these were reported felt.

 

The last activity in the Reykjanes Ridge with M>=4.6 occurred as a swarm on March 10 and 11, 2019 in which the maximum magnitude was M 5.9. Forecast 118523 had expected today's event within about 100 km was likely in early September.

 

O:  8SEP2019 21:26:32  58.5N   31.6W mb=4.6  EMSC   REYKJANES RIDGE              

P:  3SEP2019 118523    59.0N   30.0W 4.0-5.3 BAAAA  North Mid-Atlantic Ridge   

 

The only precious earthquake within about 300 km of the M 4.1 in the Arctic

Ocean in the past 30 years was an M 4.6 on November 12, 2006.  Today's epicenter is located at 102 degrees from Sumatra where the last major global earthquake occurred with M 6.8 on August 2, 2019.

 

O:  8SEP2019 19:34:08  79.1N  144.2W mb=4.1  EMSC   ARCTIC OCEAN                 

 

The largest earthquake in the U.S. or Canada today was an M 5.3 in the Andreanof Islands, Aleutians. This active area has been relatively quiet in recent weeks. Only two earthquakes in the western Andreanof Islands have exceed M 5.3 in the past year - an M 6.1 on May 23, 2019 and an M 5.9 on January 5, 2019. Forecast 118516 had expected today's event was likely around September 5.

 

O:  9SEP2019 03:54:06  51.5N  178.7W Mw=5.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  5SEP2019 118516    50.9N  179.0W 3.5-4.9 BAAAA  Andreanoff Isls, Aleutians 

 

Much of the activity at high latitudes and near the equator was probably promoted by the current geomagnetic storm, the strongest and longest in months. This summary had expected this in previous issues as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 14.  High latitude geomagnetic field also saw active conditions  with AP at 26.  This continues the most disturbance in the geomagnetic field since AP reached 76 on August 26, 2018 more than a year ago. This storm could bring enhanced seismicity near the geomagnetic equator and high latitudes in the next several days with the most likely major event around September 4-7." (September 2-5, 7,  2019)

 

SEISMIC ENHANCEMENT AT NORTHERN LATITUDES CONTINUES

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 7, 2019

 

Enhanced seismicity at high latitudes continued today with an M 4.2 in Iceland and an M 4.7 in the Greenland Sea. The strongest quake in North America was an

M 4.7 in the Yukon Territory of Canada at 60 North latitude. In the South an M 5.4 occurred in the South Sandwich Islands. This activity was probably promoted by the current geomagnetic storm as noted in the previous issue of this summary:

 

 

"Seismicity in the world's ocean ridges also continued active today - especially at high latitudes. The most notable of these events were unusual quakes of M 5.3 in the Southern Mid-Atlantic Ridge and a similar event of M 5.2  in the Greenland Sea north of Svalbard on September 2. One of the largest of these high latitude events in the Atlantic was an M 5.1 in the Drake Passage on September 5 but an M 5.9 also hit the North Atlantic on September 2 and a series on the Reykjanes Ridge was recorded with maximum magnitude on September 5, 2019. Earthquakes at high latitude in the Southern Hemisphere have included an M 4.5 in the Balleny Islands on September 5. The geomagnetic storm is still ongoing, was most active at high latitudes where northern lights were quite visible in early September at the height of the storm. This summary had noted this storm as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 14.  High latitude geomagnetic field also saw active conditions  with AP at 26.  This continues the most disturbance in the geomagnetic field since AP reached 76 on August 26, 2018 more than a year ago. This storm could bring enhanced seismicity near the geomagnetic equator and high latitudes in the next several days with the most likely major event around September 4-7." (September 2-5, 7,  2019)

 

The earthquake in Iceland is the strongest within about 200 km of that epicenter since events of M 4.5 on June 24, 2019.

 

O:  8SEP2019 02:03:00  64.6N   17.5W ML=4.2  EMSC   ICELAND                      

P: 31AUG2019 118323    66.0N   17.0W 3.0-4.3 CAAAA  Iceland area               

 

The earthquake in the Greenland Sea is the strongest in that region sincen an M 5.6 on February 8, 2018. It lies at the northern extreme of significant global seismicity.

 

O:  7SEP2019 20:05:10  79.5N    4.3E mb=4.7  EMSC   GREENLAND SEA                

 

The strongest earthquake in the world today was an M 5.4 in the South Sandwich Islands at the southern extreme of global seismicity. This is probably a regional aftershock of the M 6.6 that occurred about 150 km south of this on August 27, 2019. It was not reported felt in the epicentral region. Forecast 118581 had expected regional seismicity in early September in the South Sandwich Islands.

 

O:  7SEP2019 18:50:37  59.0S   26.5W mb=5.4  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  1SEP2019 118581    60.0S   26.0W 4.0-5.5 CAAAA  So. Sandwich Islands       

P:  6SEP2019 118581    57.0S   27.0W 4.0-5.5 ABAAA  So. Sandwich Islands       

 

The most unusual earthquake in the world today was an M 4.6 in Angola. It was not reported felt in this region. The last earthquake of M>=4.6 in Angola occurred on March 5, 2002 with M 5.2. Three such quakes hit the area in the 1990's with M 4.7-4.9.

 

O:  7SEP2019 18:49:56  13.1S   21.5E mb=4.6  EMSC   ANGOLA                       

 

The strongest earthquake in the U.S or Canada today was an M 4.6 followed by aftershock of M 4.1 in the Southern Yukon Territory, Canada. This continues activation of the region in recent days. The largest recent earthquakes within about 200 km of today's epicenter occurred as an M 4.7 on March 11, 2019 and prior to that as an M 6.0 on July 17, 2014. Forecast 118528 had expected today's activity was likely around September 11.

 

O:  8SEP2019 04:52:56  60.0N  140.7W ML=3.6  EMSC   SOUTHERN YUKON TERRITORY, CANA

O: 08SEP2019 04:01:47  60.2N  139.5W MB=4.1  ECAN  YAKUTAT, AK   

O:  8SEP2019 04:01:39  60.1N  140.7W Mw=4.6  EMSC   SOUTHERN YUKON TERRITORY, CANA

P: 11SEP2019 118528    59.0N  137.0W 3.0-4.4 BBBAA  Southeast Alaska            

 

 

The most unusual earthquake in the U.S. today was an M 2.3 in the Gulf of Maine. It was probably triggered by the passage of Hurricane Dorian over the epicenter at the time of the earthquake. It was not reported felt. The last event of M>=2.3 in the Gulf of Maine within about 100 km of today's epicenter occurred as an M 2.6 on January 17, 2018 and prior to that an 3.0 on June 21, 2013. Forecast 118490 had expected seismicity in the region of Maine around September 5.

 

O:  7SEP2019 13:00:40  44.0N   68.9W ML=2.3  EMSC   GULF OF MAINE                

P:  5SEP2019 118490    46.0N   66.0W 2.0-3.8 ABBAA  E. of Maine                

 

Another earthquake today which was probably triggered by a tropical cyclone was an M 4.7 in the Bonin Islands, Japan. It was not reported felt. Forecast 118430 had expected this activity in early September. This summary had noted the passage of Tropical Storm Faxai over this epicenter at this time as:

 

"TS Faxai (14W) continued today in the region of the North Pacific south of eastern Honshu, Japan with winds up to 90 kts.  It is expected to track to the west reaching Honshu, Japan in the area of Tokyo around September 9 as a typhoon. A seismic watch is in effect for southeastern Honshu from September 8-12." (September 5-7, 2019)

 

O:  7SEP2019 14:16:15  27.9N  142.8E mb=4.7  EMSC   BONIN ISLANDS, JAPAN REGION  

P:  2SEP2019 118430    28.0N  142.0E 4.0-5.3 BAAAA  Bonin Islands              

 

STRONG ACTIVITY CONTINUES IN VANUATU

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 6, 2019

 

As has occurred through most of the start of September, the strongest activity

in the world occurred in the Southwest Pacific in Vanuatu. Today's event of

M 5.8 was located in Southern Vanuatu near the Loyalty Islands. The last earthquake in Vanuatu within about 200 km of this epicenter occurred May 19, 2019 in  the Loyalty Islands with M 6.2 and 5.3.  Forecast 118558 had expected today's event within about 100 km was likely  around September 7.

 

O:  6SEP2019 15:27:57  20.1S  169.1E Mw=5.8  EMSC   VANUATU                      

P:  7SEP2019 118558    21.0S  169.0E 4.0-5.3 AAAAA  Loyalty Islands            

 

The strongest earthquake in the U.S. or Canada today occurred as an M 4.6 in Central Alaska. NEIC reported this earthquake of M 4.6 in Central Alaska  was felt with intensity II-III in the area(s) of Central Alaska at Anderson, Clear, Fairbanks. This is the largest earthquake within about 150 km of this epicenter since an M 4.6 on April 8, 2019. The last of larger magnitude was an M 5.1 on January 6, 2019. Forecast 118536 expected today's activity in Central Alaska was likely around September 4.

 

O:  6SEP2019 23:32:28  64.6N  152.4W Mw=4.3  EMSC   CENTRAL ALASKA                

O:  6SEP2019 23:32:28  64.6N  152.4W Mw=4.6  ANSS   CENTRAL ALASKA               

P:  4SEP2019 118536    63.0N  151.5W 3.2-4.8 ABAAA  Central Alaska             

 

Seismicity in the world's ocean ridges also continued active today - especially at high latitudes. The most notable of these events were unusual quakes of M 5.3 in the Southern Mid-Atlantic Ridge and a similar event of M 5.2  in the Greenland Sea north of Svalbard on September 2. One of the largest of these high latitude events in the Atlantic was an M 5.1 in the Drake Passage on September 5 but an M 5.9 also hit the North Atlantic on September 2 and a series on the Reykjanes Ridge was recorded with maximum magnitude on September 5, 2019. Earthquakes at high latitude in the Southern Hemisphere have included an M 4.5 in the Balleny Islands on September 5. The geomagnetic storm is still ongoing, was most active at high latitudes where northern lights were quite visible in early September at the height of the storm. This summary had noted this storm as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 14.  High latitude geomagnetic field also saw active conditions  with AP at 26.  This continues the most disturbance in the geomagnetic field since AP reached 76 on August 26, 2018 more than a year ago. This storm could bring enhanced seismicity near the geomagnetic equator and high latitudes in the next several days with the most likely major event around September 4-7." (September 2-5, 2019)

 

Today's M 5.3 in the South Atlantic was the largest within about 250 km of this epicenter since an M 5.5 on March 17, 2018 and prior to that an M 5.3 on August 2, 2015. Today's events in Svalbard and the Southern Mid-Atlantic were near 103 degrees from the M 6.8 in Sumatra of August 2 and may have been promoted from that source, the last major earthquake located in the earth.

 

O:  7SEP2019 05:35:04  46.9S   10.6W mb=5.3  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

 

O:  2SEP2019 13:02:45  80.1N    1.1W mb=5.2  EMSC   NORTH OF SVALBARD            

 

M 5.9 OFF OREGON COAST COINCIDES WITH LANDFALL OF HURRICANE DORIAN

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 5, 2019

 

A strong M 5.9 hit the area off the Coast of Oregon today. NEIC reported it was lightly felt with intensity I-III in Bandon, Laglois, Newport, Brookings, Tillamoot, Springfield, Portland, and Oregon City, Oregon. This follows an M 6.3 which hit the same area August 29, 2019 and was probably promoted by slopefall of Hurricane Dorian as noted in previous issues of this summary:

 

"As noted in previous issues of this summary, Dorian has probably helped promote at least two other earthquakes. The first of these was an M 6.3 off the coast of Oregon, the largest in that area in nearly 30 years. This occurred as Dorian was making contact with the Continental Slope off the east coast of the U.S." (September 3, 2019)

 

Prior to the M 6.3 on August 29, 2019 the last event within about 250 km of today's epicenter was an M 6.2 on August 22, 2018 and an M 5.9 on June 1, 2015.

Forecast 118503 had expected today's activity within about 75 km of the epicenters was likely around September 3. Aftershocks of M 3.7 and 4.0 were recorded.

 

O:  5SEP2019 14:25:47  43.7N  127.4W mb=3.7  EMSC   OFF COAST OF OREGON          

O:  5SEP2019 15:02:46  43.7N  127.9W Mw=5.9  EMSC   OFF COAST OF OREGON          

O:  5SEP2019 15:27:28  43.9N  127.5W mb=4.0  EMSC   OFF COAST OF OREGON          

P:  3SEP2019 118503    44.1N  128.8W 3.0-4.4 AAAAA  Off Coast of Oregon        

 

A series of moderate earthquakes occurred today at high latitudes. These included an M 5.1 south of South America in the Drake Passage and an M 4.5 in the Balleny Islands region south of New Zealand.  The last earthquake in the  Drake Passage with M>=5.1 was an M 5.1 on November 16, 2018. This and today's event may be aftershocks of an M 6.3 at this epicenter on October 29, 2018. Today's event may also have been promoted by the current geomagnetic storm, now waning, as noted in previous summaries:

 

 

"The geomagnetic field saw disturbed conditions today. The AP level was 14.  High latitude geomagnetic field also saw active conditions  with AP at 26.  This continues the most disturbance in the geomagnetic field since AP reached 76 on August 26, 2018 more than a year ago. This storm could bring enhanced seismicity near the geomagnetic equator and high latitudes in the next several days with the most likely major event around September 4-7." (September 2-6, 2019)

 

O:  5SEP2019 16:06:03  57.6S   66.4W Mw=5.1  EMSC   DRAKE PASSAGE                

 

The M 4.5 in the Balleny Islands is the strongest within about 300 km of that epicenter since an M 4.6 on November 21, 2018 and prior to that an M 5.5 on August 10, 2018. Today's epicenter is antipodal to Iceland but probably too small to trigger significant activity in that active area.

 

O:  5SEP2019 13:14:56  63.9S  170.4E mb=4.5  EMSC   BALLENY ISLANDS REGION       

 

South of Iceland in the Northern Mid-Atlantic Ridge, a series of moderate quakes, including an M 5.5, occurred as well and may also have been promoted by the current geomagnetic storm. The last activity with M>=5.2 within about 250 km of this epicenter occurred March 31, 2017 with M 5.5 and as an M 7.1 on February 13, 2015. Forecast 118523 had expected this activity was likely within about 50 km early in September. Hurricane Dorian may pass over this area in several days and could extend seismic activity in the region at that time.

 

O:  5SEP2019 11:52:06  52.7N   31.8W mb=5.2  EMSC   NORTHERN MID-ATLANTIC RIDGE  

O:  5SEP2019 11:52:06  52.6N   31.9W mb=5.5  ANSS   NORTHERN MID-ATLANTIC RIDGE  

O:  5SEP2019 15:47:40  53.0N   31.5W mb=4.6  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P:  5SEP2019 118523    54.0N   35.0W 4.0-5.3 AACAA  North Mid-Atlantic Ridge   

P: 11SEP2019 118523    53.0N   32.0W 4.0-5.3 CAAAA  North Mid-Atlantic Ridge   

 

An unusual earthquake of M 5.3 occurred today in the South China Sea. It was not reported felt or damaging. TD 16W passed near this epicenter several days ago and may have helped promote today's event. This was noted in this summary at the time as:

 

"TD 16W formed today west of the Central Philippines with winds up to 40 kts. It is expected to track to the southwest and not to threaten regional seismicity over the next several days." (September 2, 2019)

 

The only previous event in the past 30 years in the South China Sea occurred as an M 5.3 on September 6, 1998. No larger events in the area have been recorded in this time period. Forecast 118414 had expected activity to the east in the Philippines at this time.

 

O:  5SEP2019 13:58:34  14.7N  116.2E Mw=5.3  EMSC   SOUTH CHINA SEA              

P:  4SEP2019 118414    13.0N  121.0E 3.5-4.9 ACBAA  Luzon, Philippines         

 

Moderate earthquakes of M 4.7 and 5.0 in the Democratic Republic of the Congo today may have been promoted by tidal effects associated with the new moon. An M 4.7 in the area occurred within an hour of local solar midnight a prime time for tidal effects to help promote seismicity. The tidal forecast had read:

 

 

"The New moon  arrived August 30, 2019 at 10:37 UT. Longitudes which are sub-solar at this time include those within about 25 East and 155 West longitudes and include Europe and East Africa and the Central Aleutians and eastern Alaska. These are areas most likely to see tidal promotion of seismicity at this time. But many areas respond to tidal stresses and seismicity around the world is likely to be enhanced through early September." (August 29-September 4, 2019)

 

NEIC reported the earthquake of M 5.0 in D.R. Congo was felt with intensity II-III in the area(s) of Kindu Maniema, D.R. Congo and Rwamagana, Rwanda.

 

O:  5SEP2019 23:04:56   2.0S   27.1E mb=4.7  EMSC   DEMOCRATIC REPUBLIC OF THE CON

O:  5SEP2019 18:50:05   2.1S   27.2E mb=5.0  EMSC   DEMOCRATIC REPUBLIC OF THE CON

P: 11SEP2019 118390     6.0S   30.0E 3.0-4.5 CCCAA  Lake Victoria area         

 

FIJI/TONGA CONTINUE ACTIVE

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 4, 2019

 

The areas of Fiji and Tonga south to New Zealand continued at active seismic conditions today. The strongest earthquake in the area today was an M 5.7 in Fiji. This is not a classical aftershock of the M 6.7 in the area of September 1 as it occurred about 250 km northeast of that event. The last earthquake of M>=5.7 within about 100 km of today's epicenter occurred a year ago on August

19, 2018 with M 6.3. Forecast 118552 had expected today's event was likely around September 6.

 

O:  4SEP2019 19:32:23  18.1S  174.9W mb=4.6  EMSC   TONGA                        

O:  4SEP2019 09:48:22  18.9S  176.3W Mw=5.7  EMSC   FIJI REGION                  

P:  6SEP2019 118552    18.0S  177.0W 4.0-5.3 AAAAA  Tonga Islands              

 

Two events of M 5.1-5.2 also occurred north of North Island, New Zealand today.

GEONET reported an event at M 5.2 (M 4.9, EMSC) was felt with light intensity in the area of northern North Island,  New Zealand. 30 persons reported feeling this earthquake with 23 of weak  intensity; 3 with light intensity and 3 with shaking shaking. One person reported extreme intensity. NEIC reported this earthquake of M 4.9 off the east coast of North Island,  New Zealand  was felt with intensity II-III in the area(s) of New Zealand in Ruatoria, Gisborne, New Zealand. GEONET also reported an event at M 4.7 (M 5.1 EMSC) was felt with moderate intensity northeast of Okahune and in southwestern North Island and northern South Island. Light to moderate intensity was reported throughout much of southern and western North Island and northern South Island. More than 4410 people reported feeling this earthquake with 2208 reports of weak intensity; 1539 of light intensity; 558 with moderate intensity; 79 with strong intensity; and 10 of severe intensity and 16 of extreme shaking. NEIC reported this earthquake of M 5.1 in North Island, New Zealand  was felt with intensity II-III in the area(s) of North Island, New Zealand in Turangi (VII) and IV in Taupo and Taumarunui, New Zealand. The last activity in the region of North Island with M>=5.1 occurred on June 3, 2019 (M 5.4) and February 28, 2019 (M 5.1).  Forecasts 118572 had expected this activity was likely in early September.

 

O:  4SEP2019 09:13:42  36.6S  179.0E mb=4.9  EMSC   OFF E. COAST OF N. ISLAND, N.Z

O: 04SEP2019 09:13:46  36.8S  178.6E ML=5.2  GEONET Felt with light intensity

P: 10SEP2019 118572    37.0S  177.0E 3.0-4.4 CABAA  North Island, N.Z.         

 

O:  4SEP2019 07:02:52  38.8S  175.9E mb=5.1  EMSC   NORTH ISLAND OF NEW ZEALAND  

O: 04SEP2019 07:04:34  38.8S  175.9E ML=4.7  GEONET Felt with moderate intensity

P:  1SEP2019 118572    39.0S  175.0E 3.0-4.3 BAAAA  North Island, N.Z.         

 

High latitude seismicity continued at high levels today. This is probably  related to the geomagnetic storm which is now winding down as noted in this summary:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 12.  High latitude geomagnetic field also saw active conditions  with AP at 23.  This continues the most disturbance in the geomagnetic field since AP reached 76 on August 26, 2018 more than a year ago. This storm could bring enhanced seismicity near the geomagnetic equator and high latitudes in the next several days with the most likely major event around September 4-7." (September 1-4, 2019)

 

An M 4.5 in the Norwegian Sea today was the strongest in that region since an M 4.5 February 24, 2019 and an M 4.8 on January 16, 2019. The last event of M>=5 in the area was an M 5.2 on August 11, 2018. Forecast 118541 expected today's event was likely within about 100 km of this epicenter in early September.

 

O:  5SEP2019 06:14:37  72.7N    2.9E mb=4.5  EMSC   NORWEGIAN SEA                

P: 11SEP2019 118541    72.0N    0.0E 3.0-4.3 CAAAA  Norway                     

 

An earthquake of M 4.4 in Taiwan today accompanied the passage of Typhoon Lingling over the epicenter. The area has been active since Typhoon Lingling began to move through with events of M 4.9 on September 3 and M 4.5 and 4.6 on August 31, 2019. Forecast 118438 had expected today's event was likely around September 4. This summary had noted Lingling's passage as:

 

"Typhoon Lingling continued today north of Taiwan with winds up to 140 kts.  It is expected to track to the north. Regional seismicity is likely to be enhanced in the next week by stresses from this storm. But, the storm is minor and no major events are expected to be triggered at this time." (September 1-4, 2019)

 

O:  4SEP2019 13:33:18  24.0N  122.5E mb=4.4  EMSC   TAIWAN REGION                

P:  4SEP2019 118438    25.0N  123.0E 4.0-5.3 AAAAA  Ryukyu Islands             

 

GLOBAL SEISMICITY AWAITS GEOMAGNETIC EFFECTS

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 3, 2019

 

It was a generally quiet day in global seismicity with the largest event an M 5.0 in Tonga. This is likely to change in the next several days as effects from the strong geomagnetic storm of early September begin to promote larger seismic events near the geomagnetic equator and at high latitudes.

 

The strongest earthquake in the world today was an M 5.0 in Tonga. It was not reported felt in this region. It may be a regional aftershock of the M 6.7 that hit northwest of this on September 1. The area has been active during August, 2019 with the last event within about 200 km of M>=5 an M 5.0 on August 24 and an M 5.3 on August 9, 2019. Forecast 118565 had expected today's event within about 25 km of the epicenter in early September.

 

O:  3SEP2019 12:53:29  21.3S  174.0W mb=5.0  EMSC   TONGA                        

P:  9SEP2019 118565    21.0S  174.0W 4.0-5.6 CAAAA  Tonga Islands              

 

An earthquake of M 4.6 was widely felt in Romania today.  NEIC reported this earthquake of M 4.6 in Romania was felt with intensity II-III in the area(s) of Brasov, Bucharest and Popesti-Leordeni, Romania and in Chisinau, Moldava.  This is the strongest earthquake in Romania since an M 5.5 on October 28, 2018.  Forecast 118509 had expected this event within about 100 km of the epicenter was likely in early September.

 

O:  3SEP2019 11:52:51  45.5N   26.3E ML=4.5  EMSC   ROMANIA                      

O:  3SEP2019 11:52:53  45.5N   26.3E ML=4.6  ANSS   ROMANIA                      

P:  9SEP2019 118509    46.0N   27.0E 3.0-4.8 CAAAA  Romania/NW Turkey          

 

STRONG ATLANTIC EARTHQUAKE LIKELY PROMOTED BY HURRICANE DORIAN

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 2, 2019

 

An earthquake of M 5.9 occurred in the central mid-Atlantic today. This epicenter is east of the current location of Hurricane Dorian, a location that storm has held for the past four days. It is likely that stresses and low pressures associated with Dorian promoted the North Atlantic event today.

As noted in previous issues of this summary, Dorian has probably helped promote at least two other earthquakes. The first of these was an M 6.3 off the coast of Oregon, the largest in that area in nearly 30 years. This occurred as Dorian was making contact with the Continental Slope off the east coast of the U.S. A number of cases, including the largest earthquake ever recorded in the Vancouver Island region have occurred as major hurricanes make slope-fall. The other was an M 5.0-5.1 in the Virgin Islands two days ago. This was the strongest such event in the Virgin Islands since November, 2011. It occurred after Dorian passed near the epicenter to the west. The antipodal area to the North Atlantic epicenter has also been active in the past month. This region in Northern Territory, Australia showed events of M 5.3 and 5.4 most recently on August 1, 2019 within about 150 km of the antipode of the North Atlantic event. When the M 5.4 hit this region of Australia on August 1, this summary noted the relation with the North Atlantic as:

 

"The antipode (of the event in Australia) is in the northern Mid-Atlantic at 20N 45W where a possible event could occur." (August 1, 2019)

 

Some aftershock activity in Northern Territory, Australia may also follow in the next several days.

 

Earthquakes of M 5.9-6.0 hit the region within about 200 km of today's epicenter on June 21, 2016; July 27, 2014 and June 6, 2009. The last, and only such event in the past 30 years of significantly larger magnitude was an M 6.4 on June 10, 1991. Forecast 118434 had expected a moderate quake within about 100 km of this was likely in early September. This epicenter is located at 144 degrees from the  M 6.8 in Sumatra and may have been promoted from that source.

 

O:  2SEP2019 22:45:48  23.8N   45.2W Mw=5.9  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 11SEP2019 118434    24.0N   46.0W 4.0-5.3 CAAAA  Mid-Atlantic Ridge         

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in the Alaska Peninsula.  The last earthquake within about 200 km of this epicenter with M>=4.7 occurred October 10, 2018 with M 5.4.  Forecast 118316 had expected a moderate quake in the area around August 27.

 

O:  3SEP2019 05:39:28  55.1N  159.4W mb=4.7  EMSC   ALASKA PENINSULA             

P: 27AUG2019 118316    54.7N  161.2W 3.5-4.8 CABAA  Unimak Islands, Aleutians  

 

An unusual swarm of light earthquakes hit the Mount Shasta area of northern California today. This may be due to motions of magma near the Volcano. The largest of today's events was an M 2.7, the strongest in the Mount Shasta area since an M 3.1 on June 4, 2019 and prior to that an M 2.7 on May 25, 2017.

Forecast 118501 had expected today's activity was likely around September 1.

 

NEIC reported this earthquake of M 2.7 in Northern California was felt with intensity II-III in the area(s) of Mount Shasta, McCloud, Dunsmuir, Burney, Northern California. This activity is located at 104 degrees from the Banda Sea M 7.3 of July 14 and may have been promoted by concentrated energy from that region.

 

O: 03SEP2019 05:57:06  41.4N  122.1W Md=2.2  EMSC   MOUNT SHASTA AREA, CALIFORNIA

O: 03SEP2019 05:52:53  41.4N  122.1W Md=2.3  EMSC   MOUNT SHASTA AREA, CALIFORNIA

O: 03SEP2019 05:14:21  41.4N  122.1W Md=2.0  EMSC   MOUNT SHASTA AREA, CALIFORNIA

O: 03SEP2019 04:06:37  41.4N  122.1W Md=2.1  EMSC   MOUNT SHASTA AREA, CALIFORNIA

O: 03SEP2019 03:58:53  41.4N  122.1W Md=2.1  EMSC   MOUNT SHASTA AREA, CALIFORNIA

O: 03SEP2019 01:48:04  41.4N  122.1W Md=2.5  EMSC   MOUNT SHASTA AREA, CALIFORNIA

O: 03SEP2019 00:27:03  41.4N  122.1W Md=2.2  EMSC   MOUNT SHASTA AREA, CALIFORNIA

O: 03SEP2019 00:24:19  41.4N  122.1W Md=2.2  EMSC   MOUNT SHASTA AREA, CALIFORNIA

O:  2SEP2019 17:34:12  41.4N  122.1W Md=2.7  EMSC   MOUNT SHASTA AREA, CALIFORNIA

P:  1SEP2019 118501    40.7N  122.3W 2.5-4.3 AAAAA  Northern California        

 

GEOMAGNETIC STORM ASSOCIATED WITH M 6.7 IN FIJI

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 1, 2019

 

A major geomagnetic storm, the strongest in more than a year, occurred today as noted in this summary:

 

"The geomagnetic field saw stormy conditions today. The AP level was 45.  High latitude geomagnetic field also saw major storms  with AP at 86.  This is the most disturbance in the geomagnetic field since AP reached 76 on August 26, 2018 more than a year ago. This storm could bring enhanced seismicity near the geomagnetic equator and high latitudes in the next several days with the most likely major event around September 4-7." (September 1-2, 2019)

 

A strong earthquake of M 6.7 in the Central Fiji Islands accompanied the geomagnetic storm. NEIC reported it was felt with intensity II in Suba, Central Fiji Islands. This earthquake was probably triggered by effects of the geomagnetic storm as it occurred near the geomagnetic equator at a deep focus which is often active with geomagnetic storms; near local solar midnight when geomagnetic effects predominate and  at the peak disturbance of the storm when

KP reached 6. It is the strongest earthquake in the world in a month. The last of equal or greater magnitude were of M 6.8 in Sumatra on August 2 and in central Chile on August 1.

 

Today's earthquake is the strongest within about 200 km of this epicenter since an  M 6.7 on September 30, 2018. Both are probably aftershocks of an M 8.2 which hit the area on August 19, 2018.  Forecast 118566 had expected today's event around September 2. It is located at 100-101 degrees from the M 8.0 in Peru of May 26, 2019 and may have been promoted by concentrated energy from that source.

 

O:  1SEP2019 15:54:21  20.4S  178.5W Mw=6.7  EMSC   FIJI REGION                  

O:  1SEP2019 17:18:25  20.6S  178.4W mb=4.6  EMSC   FIJI REGION                  

P:  2SEP2019 118566    20.0S  178.0W 4.0-5.3 AAAAA  Tonga Islands              

 

The strongest earthquake in the U.S or Canada today was an M 4.2 in the Fox Islands, Aleutians, Alaska. A similar M 4.2 occurred August 31 and was reported in this summary as:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.2 in the Fox Islands, Aleutians. It was not reported felt in this remote area. This is the strongest earthquake in the Fox Islands within about 100 km of this epicenter since an M 4.5 on May 20, 2019. Forecasts 118303 had expected today's activity in this area around August 28." (August 31, 2019)

 

Today's event is about 200 km east of the August 31 epicenter and could indicate an approaching activation of the Fox Islands which are capable of large earthquakes.

 

NEIC reported this earthquake of M 4.2 in the Fox Islands, Alaska was felt with intensity II-III in the area(s) of Nikolski, Alaska.

 

O:  1SEP2019 23:19:17  53.1N  168.7W mb=4.2  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  2SEP2019 118519    53.5N  167.3W 3.5-4.8 AAAAA  Fox Islands, Aleutians     

 

MODERATE QUAKE IN VIRGIN ISLANDS LIKELY RELATED TO HURRICANE DORIAN

 

EARTHQUAKE SUMMARY FOR AUGUST 31, 2019

 

A moderate earthquake of M 5.1 in the Virgin Islands today was reported with intensity II in Road Town, Tortola, British Virgin Islands and III in Saint Thomas, U.S. Virgin Islands. This is probably a delayed earthquake following the passage of Hurricane Dorian two days ago through the region. This summary had noted this possibility in previous issues as:

 

"TS Dorian continued today South of The Virgin Islands and Puerto Rico with winds up to 50 kts. It is expected to track to the west and north passing over the Dominican Republic around August 29. A seismic watch may be called as this storm approaches landfall." (August 28, 2019)

 

The last earthquake of M>=5.1 within about 150 km of today's epicenter in the Virgin Islands was an M 5.2 on November 12, 2011. Forecast 118191 had expected today's event within this area was likely around August 28.

 

O: 31AUG2019 08:45:13  19.0N   64.0W mb=5.1  EMSC   VIRGIN ISLANDS REGION        

P: 28AUG2019 118191    18.0N   64.0W 3.0-4.8 BAAAA  Leeward Islands            

 

The strongest earthquake in the world today was an M 5.5 in Myanmar (Burma). NEIC reported maximum intensity V in Myanmar at Shwebo and Mogok and IV in Maymyo. Lesser shaking of II-III was reported from Monywa, Mandalay, Lashio, Taunggyi, Myanmar; Manipur, India; Dulia Gaon Assam, India an Yunnan, China.

This is the strongest earthquake within about 250 km of this epicenter since an M 5.5 about 250 km northeast of this on January 7, 2018 with the last of larger magnitude an M 6.9 on April 13, 2016. Forecast 118214 had expected a moderate quake in Myanmar at the end of August.

 

O: 31AUG2019 15:09:22  22.8N   95.5E Mw=5.5  EMSC   MYANMAR                       

P: 29AUG2019 118214    25.0N   97.0E 4.0-5.3 ACAAA  Myanmar                    

 

Two moderate earthquakes including an M 5.5 also occurred today in the Southern  East Pacific Rise. The last earthquake of M>=5.5 within about 300 km of these epicenters occurred on July 13, 2019 and prior to that as an M 6.5 on May 12, 2014.

 

O:  1SEP2019 02:34:50  49.9S  115.1W Mw=5.5  EMSC   SOUTHERN EAST PACIFIC RISE   

O: 31AUG2019 23:54:41  50.0S  114.4W mb=5.2  EMSC   SOUTHERN EAST PACIFIC RISE   

 

The largest earthquake in the U.S. or Canada today was an M 5.0 in Southeastern

Alaska. NEIC reported it was felt with intensity IV in Haines and Elfin Cove, Alaska and II-III in Gustavus, Skagway, Hoonah, Douglas, Juneau and Sitka, Alaska and in British Columbia at Fraser Lake and Whitehorse, Yukon, Canada.

An aftershock of M 3.4 was felt with intensity III in Douglas and Juneau, Alaska. This is part of a series of light to moderate earthquakes in this area which began several days ago with an M 3.8 on August 30, 2019. The current series began July 25, 2019 with an M 3.4 and was active in early August following the last new moon. This may be an aftershock of an M 6.3 which hit the same epicenter about 100 km to the northeast on May 1, 2017. The last aftershock of that event with M>=5 was an M 5.1 on September 16, 2017. Forecast 118315 had  expected today's activity at the end of August. The moderate event of M 4.0 on August 5 in this area prompted this summary to suggest it may have been triggered by the geomagnetic storm of that date as:

 

"The activity off the coast of southeastern Alaska also continued today. This may have been promoted by the geomagnetic storm and included the largest event in the current swarm - an M 4.0." (August 5, 2019)

 

O:  1SEP2019 06:08:54  59.1N  136.8W ML=2.9  EMSC   SOUTHEASTERN ALASKA          

O:  1SEP2019 05:11:18  59.1N  136.9W ML=3.4  EMSC   SOUTHEASTERN ALASKA          

O:  1SEP2019 04:32:26  59.1N  137.0W Mw=5.0  EMSC   BRITISH COLUMBIA, CANADA     

P: 26AUG2019 118315    59.0N  139.0W 3.0-4.4 BABAA  Southeast Alaska           

 

UNUSUAL ACTIVITY IN EASTERN EUROPE

 

EARTHQUAKE SUMMARY FOR AUGUST 30, 2019

 

The most unusual earthquakes in the world today were an M 4.5 in the Dodecanese Islands, Greece and  an M 4.7 in Bosnia and Herzegovina. NEIC reported this earthquake of M 4.8 in Bosnia and Herzegovina  was felt with intensity VI in Mramor, VI in Srebrentl and V in Tuzla, Bosnia and Herzegovina; II-III in the area(s) of Bosnia and Herzegovina at Gnojnica, Bance, Tojsici, Slavonski, Kobilja and Novi Sad, and in Brsadin, Croatia. The event in Bosnia and Herzegovina is the strongest earthquake within about 200 km of this epicenter in Bosnia and Herzegovina since an M 4.9 on January 4, 2018 and prior to that an M 4.7 on December 29, 2013. The last of significantly larger magnitude was an M 5.5 on November 3, 2010. Forecast 118269 had expected a moderate earthquake in the area around August 29. This earthquake occurred near local solar noon and may have been promoted by strong tidal stresses associated with the new moon as noted in previous issues of this summary:

 

"The New moon  arrived August 30, 2019 at 10:37 UT. Longitudes which are sub solar at this time include those within about 25 East and 155 West longitudes and include Europe and East Africa and the Central Aleutians and eastern Alaska. These are areas most likely to see tidal promotion of seismicity at this time. But many areas respond to tidal stresses and seismicity around the world is likely to be enhanced through early September." (August 28-31, 2019)

 

O: 30AUG2019 13:01:36  44.6N   18.5E mb=4.8  ANSS   BOSNIA AND HERZEGOVINA       

O: 30AUG2019 13:01:36  44.6N   18.5E mb=4.7  EMSC   BOSNIA AND HERZEGOVINA       

P: 29AUG2019 118269    42.0N   19.0E 3.0-5.0 ACAAA  Adriatic Sea               

 

The M 4.5 and an aftershock of M 4.4 in the Dodecanese Islands, Greece were widely felt. NEIC reported this earthquake of M 4.5 in the Dodecanese Islands, Greece  was felt with intensity V in Pithagorio, Samos, Greece II-III in the area(s) of the Dodecanese Islands, Greece and in Turkey at Kusadasi, Soke, Aydin and in Mugla. This is the strongest earthquake in the Dodecanese Islands within about 150 km of this epicenter since an M 4.6 on August 8, 2019 and prior to that an M 4.6 on May 28, 2019. Forecast 118263 had expected today's activity around August 29. The activity in Greece and Bosnia is located at 103 degrees from recent strong earthquakes in the Banda Sea, Peru and Ceram and was probably promoted by concentrated seismic energy from those sources.

 

O: 30AUG2019 15:38:15  37.5N   26.8E mb=4.5  EMSC   DODECANESE ISLANDS, GREECE   

O: 30AUG2019 17:21:05  37.6N   26.8E mb=4.4  EMSC   DODECANESE ISLANDS, GREECE   

P: 29AUG2019 118263    36.0N   28.0E 3.5-4.9 ABAAA  Turkey                     

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the Fox Islands, Aleutians. It was not reported felt in this remote area. This is the strongest earthquake in the Fox Islands within about 100 km of this epicenter since an M 4.5 on May 20, 2019. Forecasts 118303 had expected today's activity in this area around August 28.

 

O: 31AUG2019 06:53:49  51.9N  171.6W mb=4.2  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 26AUG2019 118303    52.1N  172.8W 3.5-4.8 BAAAA  Andreanoff Isls, Aleutians 

P: 28AUG2019 118303    52.4N  170.7W 3.5-4.8 BAAAA  Andreanoff Isls, Aleutians 

 

M 6.3 OFF OREGON PROBABLY PROMOTED BY HIGH NEW MOON TIDES

 

EARTHQUAKE SUMMARY FOR AUGUST 29, 2019

 

The strongest earthquake in the world today was an M 6.3 off the coast of Oregon. NEIC reported it was felt along the coast with intensity II-III in Oregon at Bandon, Coquile, Coos Bay, Lakeside, Gold Beach, Noth Bend, Florence, Yachats, Myrtle Beach and Powers. It was also reported with light to moderate intensity in Washington, California, British Columbia, Canada, and possibly as far as 1000 km from the epicenter.

 

Three promoters may have been involved in the strength of this earthquake off Oregon at this time. The first was Hurricane Dorian which hit the continental shelf off Florida today. This can enhance motions off the west coast of North America especially in the area off the coast of NW U.S. This has been previously noted in this summary on many occasions when strong Hurricanes make shelffall or landfall in the Eastern U.S. A second promoter may be a moderate geomagnetic storm which occurred today. The effects of Dorian were noted in previous issues of this report as:

 

"Hurricane Dorian continued today east of Florida with winds up to 115 kts. It is expected to track to the west and north reaching Florida's east coast around September 2-3 as a category 4 hurricane. A seismic watch may be called as this  storm approaches landfall." (August 29-30, 2019)

 

The third promoter of today's event off Oregon was probably high astronomical tides associated with the new moon. This summary had noted this as:

 

"The New moon  arrived August 30, 2019 at 10:37 UT. Longitudes which are sub-solar at this time include those within about 25 East and 155 West longitudes and include Europe and East Africa and the Central Aleutians. These are areas most likely to see tidal promotion of seismicity at this time. But many areas respond to tidal stresses and seismicity around the world is likely to be enhanced through early September."  (August 28-30, 2019)

 

This area often sees enhanced activity with full and new moons. The last events of M>=5.3 within about 150 km of today's event all occurred in connection with the full moon with M 5.4 - on June 22, July 17 and August 16, 2019.

 

This is the strongest earthquake off the coast of Oregon within about 250 km of this epicenter in more than 10 years - since an M 6.3 on January 10, 2008 and prior to that an M 6.3 on January 16, 2003. The only event in the region with greater magnitude in the past 30 years was an M 6.9 on July 13, 1991. Forecast 118287 had expected a moderate event in this region around  August 25-30. This earthquake is located at 100-103 degrees from the Banda Sea earthquakes of M 7.3 of July 14 and June 24, 2019 and may have been promoted by concentrated energy from those sources.

 

O: 29AUG2019 15:07:58  43.6N  128.0W Mw=6.3  EMSC   OFF COAST OF OREGON          

P: 25AUG2019 118287    44.1N  128.8W 3.0-4.3 BAAAA  Off Coast of Oregon        

P: 30AUG2019 118287    44.5N  129.8W 3.0-4.4 AABAA  Off Coast of Oregon        

 

Hurricane Dorian passed over the Dominican Republic earlier and was accompanied by a series of events of M 3.0-3.5 which were probably promoted by stresses  associated with Dorian. Forecast 118205 expected this activity was likely around August 29.

 

O: 29AUG2019 19:26:22  19.5N   70.2W ML=3.2  EMSC   DOMINICAN REPUBLIC

O: 29AUG2019 19:23:54  19.5N   70.3W ML=3.0  EMSC   DOMINICAN REPUBLIC

O: 29AUG2019 19:52:55  19.5N   70.3W ML=3.1  EMSC   DOMINICAN REPUBLIC

O: 30AUG2019 00:39:46  19.5N   70.3W ML=3.1  EMSC   DOMINICAN REPUBLIC

O: 29AUG2019 19:44:37  19.5N   70.3W ML=3.2  EMSC   DOMINICAN REPUBLIC           

P: 29AUG2019 118205    19.0N   72.0W 3.4-4.8 AAAAA  Puerto Rico                

 

STRONG ANTIPODAL SEISMICITY IN SOUTH SANDWICH ISLANDS; NORTHWEST PACIFIC

 

EARTHQUAKE SUMMARY FOR AUGUST 28, 2019

 

Strong aftershocks of the M 6.6 yesterday south of the South Sandwich Islands continued today. These included at least five events of M>=5 and two of M 5.6. These were closely associated with an M 6.1 and other events near the antipode in Kamchatka and Hokkaido, Japan. Forecasts 18371 and 118372 had expected this activity in the South Sandwich Islands was likely around August 31. When the mainshock occurred this summary noted:

 

 

"A strong M 6.6 earthquake occurred today in the South Sandwich Islands region. This may have been promoted by a moderate geomagnetic storm which also occurred today. This storm had been described in this summary as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 10.  High latitude geomagnetic field also saw disturbed conditions  with AP at 17.   This is the most disturbance in the geomagnetic field since AP reached 12 on August 6 and could bring enhanced seismicity near the equator and high latitudes." (August 27-28, 2019)

 

The arrival of the new moon on August 30 may also have been a factor in this strong South Sandwich Islands event as noted in this summary:

 

"The New moon will arrive at 10:37 UT today. Longitudes which are sub-solar at this time include those within about 25 East and 165 West longitudes and include Europe and East Africa and the Central Aleutians. These are areas most likely to see tidal promotion of seismicity at this time. But many areas respond to tidal stresses and seismicity around the world is likely to be enhanced through early September." (August 27-28, 2019)

 

The area antipodal to this epicenter is located in the area of Kamchatka, the Komandorsky, Kuril and northern Japanese islands. These regions may see seismic enhancement following the South Sandwich Islands M 6.6." (August 27, 2019)

 

Three moderate events occurred today in northern Japan and Kamchatka - an M 4.7 in Kamchatka and the largest earthquake in the world today - an M 6.1 in  Hokkaido, Japan.  NEIC reported this earthquake of M 6.1 in Hokkaido, Japan was felt with intensity IV in Aomori, Japan and II-III in the area(s) of Iwate and Hokkaido, Japan.  This is the strongest earthquake within about 200 km of this Hokkaido epicenter since an M 6.1 on April 11, 2019. The last of larger magnitude was an M 6.6 a year ago on September 5, 2018 and prior to that an M 6.7 on January 14, 2016. Forecast 118275 had expected today's activity was likely within about 100 km in late August. The M 6.1 is located at the sixth node (60 degrees) from the M 6.8 in Sumatra of August 2 and may have been promoted from that source.

 

O: 28AUG2019 23:46:41  41.0N  143.0E Mw=6.1  EMSC   HOKKAIDO, JAPAN REGION       

P: 23AUG2019 118275    41.0N  142.0E 3.5-5.3 BAAAA  Hokkaido, Japan            

 

O: 28AUG2019 12:32:35  42.7N  148.5E mb=4.7  EMSC   OFF COAST OF HOKKAIDO, JAPAN 

P: 30AUG2019 118293    45.0N  147.0E 3.5-5.3 ACAAA  So. Kurils                 

 

O: 29AUG2019 02:48:04  53.9N  161.7E mb=4.7  EMSC   OFF EAST COAST OF KAMCHATKA  

P: 31AUG2019 118308    53.0N  159.0E 4.0-5.6 AABAA  Kamchatka                  

 

The M 6.6 is the strongest event within about 200 km of this epicenter since

an M 7.1 on December 11, 2018 about 200 km north and an M 7.3 on July 15, 2013 about 200 km southeast of today's event. The last such event within about 150 km was an M 6.7 on April 16, 2009. Forecasts 118371 and 118372 had expecgted moderate seismicity in the southern South Sandwich Islands was likely around August 26-31. This activity is at 102-103 degrees from the M 6.8 in Sumatra of August 2, the last event of this size in the world and was probably promoted by concentrated energy from that source." (August 27-28, 2019)

 

Today's activity in the South Sandwich Islands is at the third node (120 degrees) from the M 7.1 in Central California of July 6 and may have been promoted from that source.

 

O: 29AUG2019 02:13:38  60.5S   26.2W mb=4.9  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 28AUG2019 10:07:49  60.5S   26.2W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 28AUG2019 07:59:01  60.5S   26.4W mb=5.6  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 28AUG2019 09:24:01  60.6S   26.4W mb=5.3  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 28AUG2019 20:19:54  60.6S   26.6W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 28AUG2019 08:00:44  60.7S   26.9W mb=5.6  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 31AUG2019 118371    57.0S   27.0W 4.0-5.5 BCAAA  So. Sandwich Islands       

P: 31AUG2019 118372    61.0S   34.0W 4.0-5.3 BACAA  Southern  Ocean            

 

The strongest earthquake in the U.S. or Canada today was an M 4.3 in the aftershock zone near Anchorage, Alaska. The mainshock in this series was an M 7.0 on November 30, 2018.  NEIC reported this earthquake of M 4.1 in the Anchorage, Alaska aftershock sequence was felt with intensity II-III in the area(s) of Anchorage, Elmendorf AFB, Fort Richardson, Alaska.  The last earthquake within about 100 km of this epicenter with M>=4.3 was an M 4.7 on July 3, 2019, part of the regional activation which preceded the M 7.1 in Central California on July 6. Forecast 118318 had expected today's event was likely around August 26. Like the activity in the South Sandwich Islands this event is located at 103 degrees from the M 6.8 in Sumatra of August 2 and may have been promoted by concentrated energy from that source.

 

O: 28AUG2019 07:48:24  61.3N  150.1W mb=4.3  EMSC   SOUTHERN ALASKA              

P: 26AUG2019 118318    60.5N  151.5W 3.2-4.9 AAAAA  Central Alaska              

 

STRONG EARTHQUAKE IN SOUTH SANDWICH ISLANDS

 

EARTHQUAKE SUMMARY FOR AUGUST 27, 2019

 

A strong M 6.6 earthquake occurred today in the South Sandwich Islands region. This may have been promoted by a moderate geomagnetic storm which also occurred today. This storm had been described in this summary as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 10.  High latitude geomagnetic field also saw disturbed conditions  with AP at 17.   This is the most disturbance in the geomagnetic field since AP reached 12 on August 6 and could bring enhanced seismicity near the equator and high latitudes." (August 27-28, 2019)

 

The arrival of the new moon on August 30 may also have been a factor in this strong South Sandwich Islands event as noted in this summary:

 

"The New moon will arrive at 10:37 UT today. Longitudes which are sub-solar at this time include those within about 25 East and 165 West longitudes and include Europe and East Africa and the Central Aleutians. These are areas most likely to see tidal promotion of seismicity at this time. But many areas respond to tidal stresses and seismicity around the world is likely to be enhanced through early September." (August 27-28, 2019)

 

The area antipodal to this epicenter is located in the area of Kamchatka, the Komandorsky, Kuril and northern Japanese islands. These regions may see seismic enhancement following the South Sandwich Islands M 6.6.

 

The M 6.6 is the strongest event within about 200 km of this epicenter since an M 7.1 on December 11, 2018 about 200 km north and an M 7.3 on July 15, 2013 about 200 km southeast of today's event. The last such event within about 150 km was an  M 6.7 on April 16, 2009. Forecasts 118371 and 118372 had expecgted moderate seismicity in the southern South Sandwich Islands was likely around August 26-31. This activity is at 102-103 degrees from the M 6.8 in Sumatra of August 2, the last event of this size in the world and was probably promoted by concentrated energy from that source.

 

O: 27AUG2019 23:55:17  60.2S   26.5W Mw=6.6  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 26AUG2019 118371    56.0S   27.0W 4.0-5.5 ACAAA  So. Sandwich Islands       

P: 31AUG2019 118371    57.0S   27.0W 4.0-5.5 BCAAA  So. Sandwich Islands       

P: 31AUG2019 118372    61.0S   34.0W 4.0-5.3 BACAA  Southern  Ocean            

 

The strongest earthquake in the U.S or Canada today was an M 4.5 in Southern Alaska. NEIC reported this earthquake of M 4.5 in Southern Alaska was felt with intensity II-III in the area(s) of Anchor Point and Homer, Alaska.  The last earthquakes within about 200 km of this epicenter with M>=4.5 occurred during the regional activation which preceded the M 7.1 in Central California. Those events were of M 4.6 and 4.7 on July 2 and 3, 2019. Forecast 118318 had expected a moderate event in this area around August 26.

 

 

O: 28AUG2019 02:35:00  59.8N  153.8W mb=4.5  EMSC   SOUTHERN ALASKA              

P: 26AUG2019 118318    60.5N  151.5W 3.2-4.9 AAAAA  Central Alaska             

 

An unusual earthquake of M 4.4 hit northern Venezuela today. It was closely associated with passage of TS Dorian as noted in previous summaries:

 

 

"TS Dorian formed today east of the Windward Islands with winds up to 45 kts. It is expected to track to the west and north passing over the Dominican Republic around August 29. A seismic watch may be called as this storm approaches landfall." (August 27, 2019)

 

This is the strongest earthquake in northern Venezuela within about 150 km  of this epicenter since an M 4.9 on December 27, 2018. Forecast 118206 had expected today's activity at the end of August.

 

NEIC reported this earthquake of M 4.4 in Venezuela  was felt with intensity IV in Valencia, Tacarigua, Palo Negro, Caracas and Puerto Carreno, Venezuela and intensity II-III in the area(s) of Venezuela at El Limon, Baruta and Chacao, Venezuela.

 

O: 28AUG2019 01:35:42  10.2N   67.9W mb=4.4  EMSC   CARABOBO, VENEZUELA          

P: 29AUG2019 118206    11.0N   63.0W 3.4-4.8 AACAA  Windward Islands           

 

QUIET CONDITIONS CONTINUE

 

EARTHQUAKE SUMMARY FOR AUGUST 26, 2019

 

Quiet global seismic conditions continued today with the largest earthquakes in thre M 5.0-5.1 range. This is expected to come to a halt over the next day or two as delayed ocean storms and geomagnetic conditions become more active. This is most likely near the equator and at high latitudes.

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 in the western Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote area. The last earthquake in the western Andreanof Islands with M>=4.4 was an M 6.1 three months ago on May 23, 2019. Forecast 118302 expected today's event was likely around August 28 within about 50 km of this epicenter.

 

O: 26AUG2019 18:57:04  51.1N  178.9W ml=3.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O: 26AUG2019 14:05:27  51.2N  179.1W mb=4.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O: 26AUG2019 14:41:18  51.3N  179.3W mb=4.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 28AUG2019 118302    50.7N  179.5W 3.5-4.9 AAAAA  Andreanoff Isls, Aleutians 

 

The strongest earthquakes in the world today occurred in southern Vanuatu/Loyalty Islands with M 5.1 and in Minahasa, Sulawesi, Indonesia with M 5.0. These are unremarkable events in active areas and do not represent a departure from recent seismicity. Forecasts 118350 and 118154 had expected these events within about 150 km at the end of August.

 

O: 26AUG2019 21:40:49  19.9S  170.0E Mw=5.1  EMSC   VANUATU                      

O: 26AUG2019 21:59:47  20.3S  169.6E mb=4.8  EMSC   VANUATU                      

P: 24AUG2019 118350    21.0S  170.0E 4.0-5.3 AAAAA  Loyalty Islands            

 

O: 27AUG2019 06:31:23   1.3N  122.1E ML=5.0  EMSC   MINAHASA, SULAWESI, INDONESIA

P: 31AUG2019 118154     0.0N  122.0E 4.0-5.3 BBAAA  Celebes Sea                

 

MODERATE QUAKE SHAKES COAST OF COLOMBIA

 

EARTHQUAKE SUMMARY FOR AUGUST 25, 2019

 

The strongest earthquakes in the world today were of M 5.3 - near the west coast of Colombia and the Solomon Islands. The event in Colombia is somewhat unusual.

NEIC reported this earthquake of M 5.3 near the west coast of Colombia   was felt with intensity II-III in the area(s) of Colombia at Buenaventura, Jamundi, Cali, Chachagui, Yumbo, Valle del Cauca.  The last earthquake within about 200  km of this epicenter with M>=5.3 in Colombia was an M 5.6 on February 22, 2015. Forecast 117937 had expected today's event was likely to the north around August 21.  The earthquake in Colombia is antipodal to Sumatra, Indonesia and some seismicity may follow in that antipodal area. A pair of moderate earthquake hit the area south of Sumatra today as well.

 

O: 25AUG2019 20:30:21   2.8N   77.9W mb=5.3  EMSC   NEAR WEST COAST OF COLOMBIA  

P: 21AUG2019 117937     5.0N   78.0W 4.0-5.3 BCAAA  Colombia                   

 

O: 25AUG2019 14:19:48   5.1S  102.4E ML=4.1  EMSC   SOUTHERN SUMATRA, INDONESIA  

O: 25AUG2019 14:17:42   5.2S  102.3E ML=4.3  EMSC   SOUTHERN SUMATRA, INDONESIA  

P: 25AUG2019 118179     6.0S  102.0E 4.0-5.4 AAAAA  So. of Sumatera            

 

The earthquake of M 5.3 in the Solomon Islands was the strongest within about 200 km of that epicenter since an M 5.5 on May 27, 2019. Forecast 118180 had this event to the west around August 26.

 

NEIC reported this earthquake of M 5.3 in the Solomon Islands was felt with intensity IV in the area(s) of Buala Isabel Solomon Islands.

 

O: 25AUG2019 17:28:49   7.9S  159.4E mb=5.3  EMSC   SOLOMON ISLANDS              

P: 26AUG2019 118180     8.0S  155.0E 4.0-5.3 AACAA  Solomon Islands            

 

A series of moderate earthquake beginning with an M 4.8 near local solar noon occurred in the Central Mid-Atlantic today and may have been promoted by tidal effects which maximize at this hour. This is the strongest activity  within about 200 km of these epicenters since an M 5.2 on July 24, 2019 and prior to that an M 5.2 on January 23, 2019. Forecast 118155 had expected this activity to the southeast was likely around August 23. The antipode of this activity is located in the region south of Papua New Guinea at 8S 140E. This is an active seismic region and could see related seismicity in the next several days.

 

O: 25AUG2019 18:31:43   8.5N   39.5W mb=4.6  EMSC   CENTRAL MID-ATLANTIC RIDGE   

O: 25AUG2019 14:54:51   8.5N   39.5W mb=4.8  EMSC   CENTRAL MID-ATLANTIC RIDGE   

O: 25AUG2019 18:46:51   8.6N   39.6W mb=4.9  EMSC   CENTRAL MID-ATLANTIC RIDGE   

O: 25AUG2019 19:05:35   8.7N   39.8W mb=4.6  EMSC   CENTRAL MID-ATLANTIC RIDGE   

P: 23AUG2019 118155     7.0N   35.0W 4.0-5.3 ABCAA  Central Mid-Atlantic Ridg  

 

The strongest earthquakes in the U.S. or Canada today were events of M 3.5 and 3.7-4.1 in the Gulf of Alaska. These were not reported felt in this remote area. These are aftershocks of the M 7.9 that hit the area on January 23, 2018 but the M 4.1 is the largest aftershock since the period of regional activation in early July, 2019 when an M 4.3 occurred in the Gulf of Alaska.

 

O: 25AUG2019 21:51:53  56.1N  148.5W ml=3.7  EMSC   GULF OF ALASKA               

O: 25AUG2019 21:51:52  56.1N  148.6W ml=4.1  ANSS   GULF OF ALASKA                

O: 26AUG2019 00:07:43  56.1N  148.6W ML=3.5  EMSC   GULF OF ALASKA               

 

An unusual earthquake of M 2.7 occurred in the North Sea east of England today. It was not reported felt. The last reported earthquake in the North Sea within about 150 km of this epicenter with M>=2.7 was an M 3.7 on May 22, 2015 and prior to that an M 3.5 on March 3, 2009. Forecast 118310 had expected activity in this area around August 24. A minor earthquake in England is possible in the next several days to accompany this North Sea event.

 

O: 25AUG2019 14:58:45  51.4N    2.9E ML=2.7  EMSC   NORTH SEA                    

P: 24AUG2019 118310    51.0N    6.0E 3.0-4.3 AABAA  Netherlands/Belgium