FAR-FIELD AFTERSHOCKS CONTINUE; STRONG QUAKES IN ANDREANOF ISLANDS, ALASKA

 

EARTHQUAKE SUMMARY FOR DECEMBER  8, 2024

 

 

The strongest earthquakes in the U.S. or Canada today occurred as a series of  events of M 6.0, 6.2, 6.3 in the central Andreanof Islands, Aleutians, Alaska.

NEIC reported they were felt in Adak, Alaska. This series is at 36 degrees (360/10) from the M 7.0 in Northern California of December 6 and is most likely far-field aftershocks due to strong energy associated with the California events.

 

The events of M 6.3 in this swarm within minutes of local solar noon and were probably promoted by strong tidal stresses which maximize near this hour. While

an M 6.4 occurred on October 16, 2023 about 200 km from today's epicenters, the last event of M>=6.3 within about 200 km of these epicenters was an M 6.3 on August 23, 2018. At the time this summary noted:

 

 

 

“The largest earthquake of the day was an M 6.3 in the Andreanof Islands, Alaska. It was not reported felt and no tsunami was associated. This appears to be an aftershock of the M 6.6 which had its epicenter to the southwest of this on August 15. These are the strongest earthquakes in the western Aleutian Islands since August 30, 2013." (August 22, 2018)

 

A great earthquake also hit near today's epicenters on June 10, 1996 with M 7.9.

 

Forecast 167923 had expected enhanced seismicity in this area was likely around December 10 within about 100 km of today's activity.

 

O: 09DEC2024 02:57:03  50.8N  177.1W ML=3.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 09DEC2024 03:30:23  50.8N  177.5W mb=5.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 09DEC2024 03:35:17  50.8N  177.5W ML=4.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 09DEC2024 03:48:39  50.8N  177.5W mb=4.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 09DEC2024 03:56:08  50.8N  177.5W mb=3.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 08DEC2024 20:01:18  50.9N  177.2W mb=5.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 09DEC2024 00:21:53  50.9N  177.4W mb=5.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 09DEC2024 00:30:39  50.9N  177.4W mb=5.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 09DEC2024 01:24:47  50.9N  177.2W mb=4.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 09DEC2024 03:11:42  50.9N  177.5W mb=4.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 09DEC2024 03:31:57  50.9N  177.5W Mw=5.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 09DEC2024 03:38:12  50.9N  177.5W mb=5.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 09DEC2024 04:01:41  50.9N  177.5W ML=3.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 09DEC2024 05:21:33  50.9N  177.5W mb=4.5  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 08DEC2024 19:57:08  51.0N  177.3W Mw=6.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 08DEC2024 20:09:04  51.0N  177.3W ML=3.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 08DEC2024 20:13:59  51.0N  177.2W ML=3.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 08DEC2024 21:02:50  51.0N  177.4W Mw=5.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 08DEC2024 21:42:38  51.0N  177.3W mb=4.8  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 09DEC2024 00:38:54  51.0N  177.4W Mw=6.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 09DEC2024 05:56:48  51.0N  177.5W mb=5.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 08DEC2024 20:23:59  51.1N  177.4W mb=4.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 09DEC2024 03:26:40  51.1N  177.6W Mw=5.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 08DEC2024 20:39:22  51.2N  177.3W Mw=5.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 09DEC2024 00:15:31  51.2N  177.3W Mw=6.3  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O:  9DEC2024 01:39:05  50.7N  177.4W ML=4.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 10DEC2024 167923    51.8N  178.0W 3.5-5.0 AAAAA  Andreanoff Isls, Aleutians 

 

 

The series of moderate aftershocks off the coast of northern California also continued today with a number of events of M>=3 and M>=4. These were generally felt lightly in the area of Ferndale and Petrolia. A classical series of far-field aftershock of the California mainshock of M 7.0 of December 6 today included a series of strong or near-strong quakes and is detailed below in  this summary.

 

Far field seismicity is generally enhanced at nodal distances near 360/n degrees where n is a small integer. At the time of the California event this summary noted the possibility of an extensive far-field aftershock series as:

 

"Antipodal (~180 degrees)

Coast of Northern California to Southern Indian Ocean

 

Outer shadow zone edge (141-148 degrees)

Coast of Northern California to Comores Islands,

 

Node 3 (120 degrees)

Coast of Northern California to Balleny Is, Sumba, Bali, South Georgia, Java, Nicobar Islands, Sumatra, 

 

Inner shadow zone edge (101-110 degrees)

Coast of Northern California to Celebes, Turkmenistan, Assam, India, China, Iran, Mid-Atlantic, New Zealand, Myanmar, Ceram, Halhahera, Molucca, Cyprus, Crete, Greece, Ceram, Christchurch, New Zealand, Molucca, Afghanistan, Caucasus, Irian Jaya, Mindanao,  

 

Node 4 (90 degrees)

Coast of Northern California to Algeria, New Guinea, Romania, Kermadec Is. New Ireland, Algeria, Central Chile, Spain, Taiwan, Algeria, Morocco, China, Bismarck Sea, Serbia, New Guinea, Central Mid-Atlantic

 

Node 5 (72 degrees)

Coast of Northern California to England, Azores, Tokyo, Japan, Tonga, Samoa, North Sea, Southern Peru, Siberia

 

Node 6 (60 degrees)

Coast of Northern California to Southern Kuril Islands, Colombia, Ecuador, northern Peru

 

Node 7 (52 degrees)

Northern California to coast of Panama, Dominican Republic, Puerto Rico, Kamchatka, South of Panama" December 5-6, 2024)

 

Forecast 167906 had expected enhanced seismicity in the area off the coast of Northern California in early December. Following is a listing of today's aftershocks from the M 7.0 California event of December 5, 2024 of M>=3. A more extensive listing can be found in the "CALIFORNIA" section of this summary.

 

O: 08DEC2024 15:15:42  40.3N  125.2W ML=3.0  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 08DEC2024 08:42:39  40.4N  125.0W ML=3.2  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 08DEC2024 16:23:14  40.4N  125.0W Mw=4.3  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 09DEC2024 00:47:11  40.4N  124.9W ML=3.6  EMSC   OFFSHORE NORTHERN CALIFORNIA

P:  7DEC2024 167906    40.7N  124.6W 2.5-4.7 AAAAA  Off Coast of No. Calif     

 

A light earthquake of M 2.1 occurred today near Reno, Nevada. It was lightly felt in this area. This event occurred near local solar midnight and may have been promoted by tidal stresses which maximize near this hour. Tidal triggering can indicate regional stresses and a larger event on the horizon.

 

Forecast 167842 had expected enhanced seismicity in this area was likely around

December 9.

 

O:  9DEC2024 06:08:57  39.2N  119.0W ML=2.1  EMSC   NEVADA                       

P:  9DEC2024 167842    38.4N  118.7W 2.5-4.6 AAAAA  California/Nevada area     

 

A light earthquake of M 2.1 occurred today in the area of southwestern Maine. It was lightly felt in this area. The last earthquake in Maine within about 100 km of this epicenter with M>=2.1 occurred on August 8, 2023 with M 2.5. At the time this summary noted:

 

 

"A light earthquake of M 2.5 also shook areas of southwestern Maine today. NEIC reported this earthquake of M 2.5 in western Maine was felt with intensity II-III in the area(s) of western Maine in Tuner, Buckfield, Livermore, Leeds, Canton, Hebron, Livermore Falls, Wayne, Sumner and Greene among others.  The last earthquake in Maine within about 100 km of this epicenter of larger magnitude was an M 2.9 on February 4, 2022 and an M 2.5 on February 11, 2016." (August 8, 2023)

 

This epicenter is at the eighth node (360/8=40 degrees) from the M 7.0 off

Northern California and was probably triggered by energy from that source.

 

O:  9DEC2024 05:07:58  44.7N   71.0W ML=2.1  EMSC   MAINE                        

P:  4DEC2024 167901    44.0N   71.0W 2.0-4.3 BAAAA  New England                

 

Mt. Kanlaon erupted today north of Mindanao, Philippines in the Negros Occidental region in Visayas. This eruption at 10.4N 123E included a magmatic  eruption and is likely to include explosive eruption. Evacuations are warranted accorded to PHIVOLCS. Mt. Kalaon is located at 100-101 degrees from the M 7.0 off northern California of December 5, 2024 and may have been excited by energy from  that source.

 

A strong earthquake of M 6.1 also occurred in the Kuril Islands where NEIC reported it was felt with intensity II in Shibetsu, Hokkaido Japan. This epicenter is at the sixth node (360/6=60 degrees) from the M 7.0 off Northern California and is probably a far-field aftershock from that event. The last earthquake within about 200 km of this epicenter with M>=6.1 occurred thirteen years ago with M 6.1 on August 5, 2011. The last and only earthquake in this area with magnitude significantly larger than M 6.1 in the past 35 years occurred on July 8, 2004. At the time of the 2011 event this summary noted:

 

"A strong earthquake occurred today in the central Kuril Islands with M 6.3.

There were no immediate reports of damage or felt effects from this remote earthquake. The Kuril Islands have been relatively quiet in recent years while the area to the south off Honshu, Japan has been very active. This is the largest earthquake in the Kuril Islands region in more than two years since an M 6.6 on April 18, 2009. That event was the last strong aftershock of the M 7.4 which occurred in the Kurils on January 15, 2009 about 200 km to the south of today's epicenter. The occurrence of the Kuril Islands earthquake at this time may represent a return to more normal seismicity in the region of Japan and the Kuril Islands or may be a part of the pattern we have discussed over the past three days including strong earthquakes near 140-150 degrees East longitude which were triggered by a strong solar flare while this longitude band was directly subsolar." (August 4, 2011)

 

Forecast 167914 had expected today's event was likely in this area around December 2 or December 8.

 

 

O:  8DEC2024 10:25:01  48.8N  152.3E MW=6.1  ANSS   KURIL ISLANDS                

P:  2DEC2024 167914    49.0N  153.0E 3.5-5.4 CAAAA  So. Kurils                 

P:  8DEC2024 167914    47.0N  153.0E 3.5-5.6 ABAAA  So. Kurils                  

 

 

 

A moderately strong earthquake was widely felt in El Salvador today. NEIC reported this event with M 5.6 was felt with maximum intensity VI in La Union and IV in Anamoros, San Salvador, Santiago de Maria, Choluteca,  and in Honduras at Bodega de Los Tangos, Yamaranguila, Marcala,; III in El Salvador at Gotera Morazan, Chirilagua and in Honduras at Choloma, Tegucigalpa, Las Tapias, Valle de Angeles, Yaguacire and La Esperanza among others.  This epicenter is located at 40 degrees (360/9) from the earthquake of M 7.0 off northern California of December 5 and was likely a far-field aftershock of that event as previously described in this summary. This earthquake is the strongest in El Salvador since an M 6.5 on July 19, 2023  and a similar M 5.6 on March 17, 2024. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 6.5-6.6 in El Salvador, Central America. NEIC reported it was felt with maximum intensity VIII in El Salvador at Chirilagua, San Miguel; VII in Concepcion, Batres Usulutan, VI in Intipuca La Union; V in Usulutan, IV in San Aleo, San Miguel, Santiago de Maria, San Luis la Herradura La Paz and lesser shaking in El Vijo and Ciudad Barrios, San Miguel. This event was preceded by several light foreshocks.

Enhanced activity in this region had been expected at this time" (July 19, 2023)

 

and

 

"The strongest earthquake in the world today was an M 5.7 off the coast of El Salvador. NEIC reported it was felt with maximum intensity IV in El Salvador in Antiguo Cuscatlan, Nuevo Cuscatlan, La Libertad and in San Salvador at Mejicanos and Apopa with lesser shaking of II-III in Intipuca, La Union, El Rosario, La Paz, Gotera, Morazan, San Marcos, San Salvador and Nueva San Salvador. The only events of equal or larger magnitude in the region of El Salvador in the past two years occurred on May 12, 2021 with M 5.9 and on November 4, 2022 with M 5.7" (December 15, 2022)

     

 

Forecast 167807 had expected this event within about 100 km was likely

around December 9.

 

O: 09DEC2024 03:57:06  13.3N   87.9W ML=4.4  EMSC   EL SALVADOR

O: 09DEC2024 04:13:46  13.3N   87.9W ML=4.0  EMSC   EL SALVADOR

O: 09DEC2024 05:17:08  13.3N   88.0W ML=4.0  EMSC   EL SALVADOR

O: 09DEC2024 05:42:49  13.3N   87.9W ML=4.0  EMSC   EL SALVADOR

O:  9DEC2024 03:50:29  13.2N   87.9W MW=5.6  EMSC   EL SALVADOR                  

P:  9DEC2024 167807    14.0N   88.0W 3.5-5.3 AAAAA  Nicaragua                  

 

A series of moderately strong earthquakes including an M 5.8, 5.3, 4.4, 5.6 occurred today on the Central East Pacific Rise. These unfelt events were concentrated around local solar noon and were probably enhanced by energy from  the tides which concentrate near this hour. This epicenter is at 51.3-51.4 degrees from the M 7.0 off northern California of December 5. This is at the seventh node (360/7=51.4 degrees) from California and is almost certainly a sign that these events in the East Pacific were far-field aftershocks from California.

 

The last earthquake in this area of the East Pacific Rise (within about 300 km ) of M>=5.6 occurred as an M 5.8 on February 18, 2021. At the time this summary noted:

 

 

"The second strongest earthquake in the world today was an M 5.8 in the Central East Pacific Rise. It was not felt in this remote area. This is the strongest earthquake within about 300 km of this epicenter since an M 5.8 on June 23, 2011. The last, and only event in the region of larger magnitude in the past 30 years was an M 6.0 on October 30, 2008. Today's event occurred within about 15 minutes of local solar noon and may have been promoted by high tidal stresses which maximize near this hour." (February 18, 2021)

 

Forecast 167774 had expected enhanced seismicity in this region of the

East Pacific Rise was likely in early December.

 

O: 08DEC2024 16:26:07   9.0S  109.6W Mw=5.3  EMSC   CENTRAL EAST PACIFIC RISE

O: 08DEC2024 20:27:27   9.1S  109.9W mb=5.1  EMSC   CENTRAL EAST PACIFIC RISE

O: 08DEC2024 18:07:50   9.2S  109.8W Mw=5.6  EMSC   CENTRAL EAST PACIFIC RISE

O: 08DEC2024 18:32:21   9.2S  109.5W mb=5.0  EMSC   CENTRAL EAST PACIFIC RISE

O: 08DEC2024 17:16:00   9.3S  109.0W mb=4.5  EMSC   CENTRAL EAST PACIFIC RISE

O:  8DEC2024 16:41:21   8.8S  109.3W MW=5.5  EMSC   CENTRAL EAST PACIFIC RISE    

P:  2DEC2024 167774     5.0S  105.0W 4.0-5.7 CCCAA  No. East Pacific Rise      

 

The earthquakes in the East Pacific Rise were closely associated with an M 4.8 in the Balleny Islands south of New Zealand. While unfelt this event is at 120 degrees (360/3) degrees from the M 7.0 off California of December 5 and is a likely far-field aftershock of that event.

 

O:  8DEC2024 16:31:05  62.0S  154.9E MB=4.8  EMSC   BALLENY ISLANDS REGION       

 

Earlier in the day an M 5.2 hit in Iceland near the antipode of the Balleny Islands. This event is likely a far-field aftershock of the M 7.0 in California as it occurred at the sixth node (360/6=60 degrees) from the California event. It was not reported felt.

 

 

An earthquake of M 5.2  occurred in the area of Iceland today. An earthquake of M 5.3 also hit this region of Iceland on April 21, 2024, the first of M>=5.2 in the past ten years - since an eruption in Iceland began on August 24, 2014. On April 21, 2024 this summary noted:

 

"The strongest earthquakes in the world today were an M 4.9 in Northern Algeria and an M 5.3 in the area of Iceland. The event in Iceland  was not associated with the current eruption near Reykjavik and was not reported felt in this remote area. ...

 

The earthquake of M 5.3 in northeastern Iceland is the largest in that area within about 150 km since a series of moderately large events occurred near this epicenter in August and September, 2014 - a volcanic series which included events of M 5.6 and 5.7 on August 26 and 27, 2014. At the time this summary noted:

 

"The earthquake of M 5.7 in Iceland is the strongest recorded in that area  since an M 5.8 on September 16, 2002, the only other event of this size in  Iceland in the past 25 years. It is part of the sub-glacial Bardarbunga volcanic eruption in the central portion of that island. ..." (April 21, 2024)

 

A second moderate earthquake of M 4.4 also occurred south of Iceland in the

Reykjanes Ridge. It was not felt.

 

These epicenters are  at the sixth node (360/6=60 degrees) from the M 7.0 off northern California of December 5 and enhanced seismicity in this area of Iceland was probably promoted by strong seismic energy from California.

 

Forecast 167950 and 167932 had expected this activity within about 75 km was likely around December 5.

 

 

 

STRONG EARTHQUAKE IN KURIL ISLANDS

 

EARTHQUAKE SUMMARY FOR DECEMBER  7, 2024

 

 

The strongest earthquake in the world today was an M 6.1 in the Kuril Islands. NEIC reported it was felt with intensity II in Shibetsu, Hokkaido, Japan.

A strong earthquake of M 6.1 also occurred in the Kuril Islands where NEIC reported it was felt with intensity II in Shibetsu, Hokkaido Japan. This epicenter is at the sixth node (360/6=60 degrees) from the M 7.0 off Northern California and is probably a far-field aftershock from that event. The last earthquake within about 200 km of this epicenter with M>=6.1 occurred thirteen years ago with M 6.1 on August 5, 2011. The last and only earthquake in this area with magnitude significantly larger than M 6.1 in the past 35 years occurred on July 8, 2004. At the time of the 2011 event this summary noted:

 

"A strong earthquake occurred today in the central Kuril Islands with M 6.3.

There were no immediate reports of damage or felt effects from this remote earthquake. The Kuril Islands have been relatively quiet in recent years while the area to the south off Honshu, Japan has been very active. This is the largest earthquake in the Kuril Islands region in more than two years since an M 6.6 on April 18, 2009. That event was the last strong aftershock of the M 7.4 which occurred in the Kurils on January 15, 2009 about 200 km to the south of today's epicenter. The occurrence of the Kuril Islands earthquake at this time may represent a return to more normal seismicity in the region of Japan and the Kuril Islands or may be a part of the pattern we have discussed over the past three days including strong earthquakes near 140-150 degrees East longitude which were triggered by a strong solar flare while this longitude band was directly subsolar." (August 4, 2011)

 

Forecast 167914 had expected today's event was likely in this area around December 2 or December 8.

 

 

O:  8DEC2024 10:25:01  48.8N  152.3E MW=6.1  ANSS   KURIL ISLANDS                

P:  2DEC2024 167914    49.0N  153.0E 3.5-5.4 CAAAA  So. Kurils                 

P:  8DEC2024 167914    47.0N  153.0E 3.5-5.6 ABAAA  So. Kurils                 

 

An earthquake of M 5.2 also occurred in the area of Iceland today. An earthquake of M 5.3 also hit this region of Iceland on April 21, 2024,  the first of M>=5.2 in the past ten years - since an eruption in Iceland began on August 24, 2014. On April 21, 2024 this summary noted:

 

"The strongest earthquakes in the world today were an M 4.9 in Northern Algeria and an M 5.3 in the area of Iceland. The event in Iceland  was not associated with the current eruption near Reykjavik and was not reported felt in this remote area. ...

 

The earthquake of M 5.3 in northeastern Iceland is the largest in that area

within about 150 km since a series of moderately large events occurred near this

epicenter in August and September, 2014 - a volcanic series which included

events of M 5.6 and 5.7 on August 26 and 27, 2014. At the time this summary noted:

 

"The earthquake of M 5.7 in Iceland is the strongest recorded in that area since an M 5.8 on September 16, 2002, the only other event of this size in Iceland in the past 25 years. It is part of the sub-glacial Bardarbunga volcanic eruption in the central portion of that island. ..." (April 21, 2024)

 

A second moderate earthquake of M 4.4 also occurred south of Iceland in the Reykjanes Ridge. It was not felt.

 

These epicenters are  at the sixth node (360/6=60 degrees) from the M 7.0 off northern California of December 5 and enhanced seismicity in this area of Iceland was probably promoted by strong seismic energy from California.

 

Forecast 167950 and 167932 had expected this activity within about 75 km was likely around December 5.

 

O:  8DEC2024 01:49:45  64.5N   17.6W MW=5.2  EMSC   ICELAND                      

P:  5DEC2024 167950    65.0N   16.0W 3.0-4.8 AAAAA  Iceland area               

 

O:  7DEC2024 20:11:48  53.2N   29.7W MB=4.4  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P:  7DEC2024 167932    50.0N   29.0W 4.0-6.1 CAAAA  North Mid-Atlantic Ridge   

 

Aftershocks of the M 7.0 off northern California of December 5, 2024 continued at a reduced rate today. Following is a listing of today's events of M>=3 in this aftershock sequence. A more extensive listing is found under the "CALIFORNIA" section of this report.

 

This activity had been expected within about 50 km around December 7, 2024.

 

O: 07DEC2024 09:43:22  40.3N  124.9W Mw=3.5  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 07DEC2024 19:54:28  40.3N  124.5W Mw=3.5  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 07DEC2024 22:04:24  40.3N  125.0W ML=3.2  EMSC   OFFSHORE NORTHERN CALIFORNIA

P:  7DEC2024 167906    40.7N  124.6W 2.5-4.7 AAAAA  Off Coast of No. Calif     

 

 

MODERATE TO STRONG EARTHQUAKES AT NODAL DISTANCES FROM NORTHERN CALIFORNIA

 

EARTHQUAKE SUMMARY FOR DECEMBER  6, 2024

 

A strong aftershock series continued today following the M 7.0 off the coast of

Northern California of December 5, 2024. Many of these were felt lightly in Ferndale and Petrolia but none were large enough to cause damage.

 

Following is a listing of aftershocks today in the region with M>=4.0. A more extensive listing can be found in the "CALIFORNIA" section of this summary.

 

Forecast 167906 had expected this activity was likely within about 50 km  around December 7, 2024.

 

O: 06DEC2024 07:01:46  40.3N  124.1W Mw=4.2  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 06DEC2024 14:36:13  40.3N  124.9W Mw=4.0  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 06DEC2024 14:58:22  40.3N  124.7W Mw=4.2  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 06DEC2024 15:50:23  40.3N  124.0W Mw=4.0  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 06DEC2024 20:01:06  40.3N  124.5W Mw=4.0  EMSC   OFFSHORE NORTHERN CALIFORNIA

P:  7DEC2024 167906    40.7N  124.6W 2.5-4.7 AAAAA  Off Coast of No. Calif     

 

The strongest earthquake in the world today was an M 5.5-6.0 in the Molucca Sea,

Indonesia. BMG gave this event at 1.7N 121.2E with M 6.0. No felt data was available from BMG for this event although mapping at the BMG website indicates it was felt with intensity up to III throughout the area. A similar event of M 5.1 was located south of this later in the day. It was reported by BMG to have been felt with intensity IV in Taliabu Baratand III in Banggai at Boka, Lede, Tabona among others. These epicenters are both at 106 degrees from the M 7.0 off the coast of northern California of December 5 and is probably a far-field aftershock from that event.

 

The last earthquake within about 150 km of this epicenter in Sulawesi with M>=6.0 occurred on November 16, 2008 with M 7.4. At the time this summary noted:

 

"A strong earthquake of M 7.5-7.6 hit the region of Minahasa, Sulawesi, Indonesia. ...  Bernama reported at least one person was killed and many injured and hundreds of houses were damaged in the northern Gorontalo area on Sulawesi island of Indonesia. At least 23 people were injured in Kwandang village, Gorontalo province. More than 700 houses fell in the Buol district 600 km north of Central Sulawesi north of the capital Palu and another 500 were damaged. Information and communications from Buol had been cut following the quake. No tsunami appears to have occurred although this was a shallow earthquake. a tsunami warning was issued but no major event appeared within the first 90 minutes and the warning was withdrawn. A tsunami did occur however and the sea level briefly rose in many areas.  Many residents fled the coast areas and roads and are currently camping on the highland areas." (November 16, 2008)

 

 

Forecast 167752 had expected this earthquake was likely to see enhanced seismicity within about 100 km of this epicenter around December 5, 2024.

 

O:  6DEC2024 17:15:00   1.5N  121.2E Mw=5.5  EMSC   MINAHASA, SULAWESI, INDONESIA

O:  6DEC2024 17:15:00   1.5N  121.2E Mw=6.0  BMG    MINAHASA, SULAWESI, INDONESIA

P:  5DEC2024 167752     1.0N  122.0E 4.0-5.4 AAAAA  Celebes Sea                

 

An earthquake of M 4.8 today occurred in the West Chile Rise. It was not felt.

This epicenter is located at 90 degrees (360/4=90 degrees) from the M 7.0 off northern California of December 5 and is probably a far-field earthquake associated with that source.

 

Forecast 167989 had expected this event within about 100 km was likely around December 4.

 

O:  7DEC2024 03:38:10  42.7S   82.1W mb=4.8  EMSC   WEST CHILE RISE              

P:  4DEC2024 167989    43.0S   83.0W 4.0-5.4 BAAAA  Chile Rise                 

 

NEIC reported an earthquake of M 5.3 in Southern Chile was felt with intensity up to V-VI in the area(s) of Southern Chile in Araucania at Carahue, Nueva Imperia; IV in Temuco, Villarrica and III in Pitrufquen. Also felt lightly in Los Lagos at Rio Bueno and Valdivia and in Bio Bio and Santiago.  EMSC reported moderate shaking in Chile at Temuco, Valdivia, Corral and Pucon. This epicenter  - like the M 4.8 in the West Chile Rise - is located at 90 degrees (360/4=90 degrees) from the M 7.0 off northern California of December 5 and is probably a far-field earthquake associated with that source. The last earthquake within about 150 km of this epicenter with M>=5.3 occurred on December 24, 2023. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 5.9 in Bio-Bio Chile. NEIC reported it was felt with intensity up to VI in the area of Canete, Chile.

An aftershock of M 5.1 in Bio-Bio, Chile was also felt with intensity up to IV in the area(s) of Bio-Bio, Chile in Canete. NEIC reported this aftershock of M 5.1 in Bio-Bio, Chile was felt with intensity up to IV in the area(s) of Bio-Bio, Chile in Canete. EMSC reported the mainshock was strongly felt in Bio-Bio at Lebu, Puren, Temuco, Lautaro, San Pedro de la Paz, Los Angeles, Pucon. This is the strongest earthquake in Bio-Bio, Chile since an M 6.3 north of this on November 13, 2022. The only other event in this region with M>=5.9 was an M 6.4 on September 21, 2021." (December 24, 2023)

 

The last strong earthquake in this region occurred as an M 6.7 on December 27, 2020 and was apparently triggered by a total eclipse of the sun as noted in this summary at the time:

 

 

"An earthquake of M 6.7-6.8 shook south-Central Chile in the region of Los Lagos today. This is the strongest earthquake in the world in nearly two months - since an M 7.0 in the Dodecanese Islands, Greece on October 30, 2020. It occurred at an epicenter where the total eclipse of the sun was maximized on December 14 and is a prime example of high tidal stresses associated with eclipses affecting subsequent seismicity. A series of strong quakes has occurred in Chile since December 14, including one within minutes of the eclipse in northern Chile, but the location of today's event at precisely the point of maximum eclipse in Chile is strong evidence for tidal triggering." (December 27, 2020)

 

Forecast 167983 and 167734 had expected enhanced seismicity in this region within about 50 km was likely at the end of November or in early December.

 

O:  7DEC2024 06:26:24  38.9S   73.6W Mw=5.3  EMSC   OFFSHORE ARAUCANIA, CHILE    

P:  7DEC2024 167983    36.0S   73.0W 4.0-5.8 ACAAA  Central Chile              

P: 24NOV2024 167734    39.0S   73.0W 4.0-5.6 CAAAA  Central Chile              

 

NEIC reported earthquakes of M 5.1 in Tonga were felt with intensity up to IV in the area(s) of Tonga at Pangai Ha'apai. This epicenter is near the fifth node from the M 7.0 in northern California (360/5=72 degrees) and this may be a far-field aftershock of that event.

 

A pair of earthquake of M 4.4-4.7 occurred today in western Canada. These occurred as an M 4.7 in the northern Yukon Territory near For McPherson and as an M 4.5 in British Columbia near Port Hardy. The M 4.4-4.7 in Northwest Territory, Canada is the strongest within about 200 km of this epicenter since an M 4.9 on November 8, 2024 and June 2, 2024 - the first of M>=4.7 in the area since an M 5.0 on December 22, 2017 and an M 4.7 on November 3, 2017.

 

"The strongest earthquake in the U.S. or Canada was an M 5.0 in Yukon Territory, Canada. NEIC reported this earthquake of M 4.9-5.0 in northern Yukon Territory, Canada  was felt with intensity up to V in the area(s) of northern Yukon Territory, Canada at Dawson City. A foreshock hours earlier of M 4.1 was reported by NEIC to have been felt near Dawson City, Canada with intensity up to IV. The last earthquake with M>=5.0 within about 300 km of today's event in

Yukon was recorded by NEIC on December 22, 2017 with M 5.0 and prior to that on September 24, 2005 with M 5.1. 

 

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

 

"The strongest earthquake in the U.S. or Canada today was an M 5.0 in the northern Yukon Territory, Canada. There were no felt reports for this earthquake but it is likely that an earthquake of this size in this region would have been felt by local inhabitants. The last earthquakes within about 250 km of this epicenter in the Yukon occurred on July 21, 1996; March 1, 1995 and January 5, 1991 all with M 5.0." (December 22, 2017, November 8, 2024)

 

Forecast 167951 had expected today's event within about 150 km was likely around December 8, 2024.

 

O: 07DEC2024 05:59:13  65.6N  135.2W MB=4.7  ECAN OF FORT MCPHERSON, NT  

O:  7DEC2024 05:59:12  65.6N  135.1W mb=4.4  EMSC   NORTHERN YUKON TERRITORY, CANA

P:  8DEC2024 167951    64.0N  137.0W 3.0-4.8 ABAAA  Northern Alaska            

 

Several other regional earthquakes of moderate magnitude in the area of the western North America also occurred today and were likely triggered by stress transfer from the M 7.0 in Northern California of December 5. The largest of these was an M 4.4 in the Vancouver Island region of Canada. This may be an aftershock of an M 6.5 that hit near this epicenter on July 11, 2024. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 6.4 in the series in Vancouver Island, British Columbia which began July 4, 2024. NEIC reported it was lightly felt with moderate intensity up to IV in Tofino, Canada. EMSC reported light shaking in Chilliwack, Canada. Several moderate aftershocks – including an M 5.4 - were also felt in this region. This summary has extensively covered this swarm in previous issues" (July 11, 2024)

 

Forecast 167916 had expected today's earthquake in the Vancouver Island area was likely around December 6.

 

O: 06DEC2024 19:39:44  48.7N  128.8W MB=3.5  ECAN OF PORT HARDY, BC  

O:  6DEC2024 06:32:03  49.2N  129.0W MB=4.4  EMSC   VANCOUVER ISLAND, CANADA REGIO

O:  6DEC2024 06:31:58  48.9N  129.5W MB=4.5  ECAN OF PORT HARDY, BC              

P:  6DEC2024 167916    47.9N  129.1W 2.8-5.1 AAAAA  Vancouver Island area      

 

 

MAJOR EARTHQUAKE HITS OFF COAST OF NORTHERN CALIFORNIA

 

EARTHQUAKE SUMMARY FOR DECEMBER 5,2024

 

 

A major earthquake of M 7.0-7.3 occurred on December 5, 2024 near local noon off the coast of Northern California. It was followed by a series of moderate felt classical aftershocks and a series of regional aftershocks. A pair of foreshocks occurred on December 4, 2024 and were described in this summary in the previous issue as:

 

"The strongest earthquakes in the U.S. or Canada today were an M 4.4 and M 4.2 off the coast of northern California. NEIC reported they may have been felt lightly in Eureka and Arcata, and at Orick and Antelope with intensity II-III in  California. The M 4.4 is the strongest event within about 100 km of this epicenter since an M 4.4 on  October 24. The only other event of M>=4.4 in this area in the past year was and M 4.9 on February 2, 2024. At the time this summary noted:

 

 

"An earthquake of M 4.9 also occurred today off the coast of Northern California. NEIC reported it was felt with intensity III in Northern California at Petrolia. NEIC reported an aftershock of M 3.4 off the coast of Northern California  was felt with intensity up to III in the area(s) of Northern California in Petrolia.  NEIC reported this earthquake of M 3.4 off the coast of Northern California  was felt with intensity up to III in the area(s) of Northern California in Petrolia. EMSC reported moderate shaking in Fortuna, California.  A foreshock of M 2.7-3.3 was also felt lightly in Petrolia, California. The last earthquake off the coast of Northern California with M>=4.9 occurred on May 21, 2023 and today's event is probably an aftershock of that mainshock. At that time this summary noted:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 5.6 off the coast of Northern California. NEIC reported it was felt with maximum intensity VI in California at Petrolia and II-III in Ferndale, Loleta, Rio Del, Fortuna, Samoa, Hydesville, Eureka, Scotia, and as far as the coast of Oregon and Central California. This is near the antipode of the M 6.8 in the Prince Edward Islands which  occurred several hours earlier in the day. Triggering associated with that event possible.     This event is near the fourth node (90 degrees) from the major

 

...

 

Earthquakes of equal or larger magnitude in this area of California have most recently occurred as an M 6.2 on December 20, 2021, an M 5.8 on March 9, 2020 and an M 5.8 on January 25, 2018." (May 21, 2023, February 2, 2024)

 

 

These events occurred at the start of Solar Flare 4140 - of class C3.5. and may have been promoted by SFE from that event.

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

4140       1137   1145      1151   C3.5      (December 4, 2024)   2.5E-03  

Coast of No. California M 4.3 11:37 UT

South Sandwich Is. M 4.9 11:46 UT" (December 4, 2024)

 

 

The Joint Typhoon Warning Center (JTWC) gave today's mainshock M 7.3 and several other magnitudes were given by various international agencies, but it appears to qualify as a "major" earthquake. This event occurred near the end of a minor C-class solar flare. It also occurred at an epicenter where the second strongest M-class flare of the day was at maximum at exactly local solar midnight as seen in SWPC data:

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

4340       0638   0641      0645   C3.3      (December 5, 2024)   1.3E-03  

4350       0656   0709      0733   M1.0      (December 5, 2024)   1.6E-02  

4370       0812   0820      0824   M1.1      (December 5, 2024)   4.2E-03  

Northern California M 7.0 18:44 UT (antipodal local solar midnight 08:20 UT)

 

4470       1917   1930      1935   C3.8      (December 5, 2024)   7.0E-04  

East Pacific Rise M 5.1 19:41 UT

Northern California M 7.0 18:44 UT

 

 

It also occurred while a northeast clipper was hitting the northeastern U.S. Both of these are possible triggers for such an event. The epicenter of this earthquake is about 104-105 degrees from a series of events including an M 5.7 in southern Iran yesterday and may have been promoted by energy from that source.

 

A tsunami warning for the west coast of the U.S. was issued but tsunamis from large earthquakes in this area are not usually powerful and it is likely that any tsunami associated with today's event would be in the centimeters height range. This warning was later withdrawn when no significant tsunami waves were observed.

 

A series of moderate earthquake in the Geysers area of northern California followed the M 7.0 off the California coast. They were likely triggered by P- and/or S-waves from that earthquake. This series included events of M 2.5 and 4.3. NEIC reported these were felt with intensity up to III in northern and Central California at Felton, San Jose, Santa Rosa, Yuba City, Rohnert Park and Fremont.

 

The last earthquake in the Geysers area of California with M>=4.3 occurred

September 7, 2024 with M 4.3, the last of larger magnitude was an M 4.5 on June 8, 2024. At the time this summary noted:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 4.5 in Northern California. NEIC reported it was felt with maximum intensity V in the Geysers, California. This earthquake occurred within minutes of local solar noon and was probably promoted by strong tidal stresses which maximize near this hour. EMSC reported strong shaking in Middletown, California. The last earthquake in the Geysers area of Northern California with M>=4.5 occurred on June 3, 2023 more than a year ago with M 4.5. The last event in the area of larger magnitude occurred as an M 5.0 on December 14, 2016.

 

 

"The strongest earthquake in the U.S. or Canada today was an M 4.5 in the Geysers region of Northern California. NEIC reported it was felt with maximum intensity IV in Kelseyville and Middletown with intensity II-III in Geyserville, Healdsburg, Hidden Valley Lake, Cloverdale, Lower Lake, Calistoga, Windsor and as far to the south as San Francisco, California. This is an area where fluid flow often controls seismicity. Strong tidal stresses can be an effective means to move fluids. So it is not surprising that this earthquake occurred in conjunction with today's full moon

 

...

 

 

Today's earthquake is the strongest event in the Geysers area since an M 5.0 on December 14, 2016. That earthquake was likely the strongest recorded in the Geysers region of California as reported at the time in this summary:

 

"While smaller earthquakes in the Geysers, California are nearly continuous, events of larger magnitude are uncommon. Today's earthquake may be the largest ever recorded in the Geysers area, in fact. An M 5.0 was recorded on May 7, 1955 but magnitudes were not well determined at the time. No other events in the Geysers area have reached M>=5.0 until today." (December 14, 2016, June 8, 2024) 

 

 

Forecast 167846 had expected today's activity in the Geysers was likely around December 7 within about 10 km of these epicenters.

 

O: 05DEC2024 18:48:34  38.8N  122.8W MD=2.3  EMSC   NORTHERN CALIFORNIA

O: 05DEC2024 18:50:36  38.9N  122.8W MD=2.2  EMSC   NORTHERN CALIFORNIA

O:  5DEC2024 18:47:36  38.8N  122.8W ML=4.2  EMSC   NORTHERN CALIFORNIA          

O:  5DEC2024 18:47:36  38.8N  122.8W ML=4.3  ANSS   NORTHERN CALIFORNIA          

P:  7DEC2024 167846    38.8N  122.8W 2.5-4.4 AAAAA  Central California         

 

Today's mainshock was reported by NEIC to have been felt with damage with intensity VIII at Redcrest and VII in Ferndale and Rio Dell. Intensity VI was reported thoughout most of Northern California including at Alderpint, Carlotta, Fortuna, Garberville, Hydesville, Loleta, Myers Flat, Scotia, Whitethorn and Six Rivers National Forest. Intensity V was felt as far as 150 km of the epicenter; IV up to 300 km as far as Oregon and III in Nevada and the remainder of California. Light shaking of II was reported in Arizona, Washington, Oregon, British Columbia, and within about 500 km of the epicenter. Earthquakes in this area can occur in pairs and can help trigger far-field seismicity, so readers are advised not to relax quite yet.

 

The last earthquake within about 200 km of today's epicenter off the coast of

Northern California with M>=7 occurred as an M 7.0-7.1 on June 15, 2005. Other

such event (all of M 7.0-7.1) in the past 35 years occurred on August 17, 1991, April 25, 1992, and September 1, 1994. At the time of the last such earthquake off the coast of northern California, this summary noted:

 

"Strong earthquakes occurred today in two areas of the U.S. and Canada. The strongest of these was an M 7.0-7.5 which occurred late tonight off the coast

 of Northern California. This was preceded by an earthquake of M6.6-6.8 in the Rat/Andreanof Islands region of the central Aleutian Islands, Alaska. A tsunami warning was issued by the USGS following the event off the coast of Northern California. That earthquake was strongly felt along the coast of Oregon and California and was reported slightly felt as far away as Keller, Texas and Berthoud, Colorado. It was felt to the south as far as Los Angeles and as far to the north as Colville, Washington more than 1000 km away from the epicenter. The quake was also felt in the Seattle area. Maximum felt intensity was VI at Myrtle Point, Oregon. This is the first event located  in the region off the coast of California (38-42N 124-130W) since an earthquake of M 7.1 on Sept. 1, 1994 (M 7.1) and April 25, 1992 (M 7.1). The largest  earthquake previously located in the region was an M 7.2 on Nov. 8, 1980 (NEIC data) If the current magnitude of M 7.4 is not revised downward, this would be the strongest earthquake ever recorded in this region off the northern coast of California (the largest previous had been M 7.3 on Jan. 31, 1922). This summary  had expected a strong earthquake in the region could occur at this time. We had emphasized this in our lead article in this summary three weeks ago on May 23, 2005 and to a lesser extent on Feb. 25, 2005 in this summary. Readers may read these warning summaries in full by clicking on more> below. The area was under very strong seismic watch conditions at the time of the quake. This seismic watch arose from triggering effects from the landfall of Tropical Storm Arlene, a strong geomagnetic storm two days ago and the occurrence of a great earthquake in Chile yesterday (M 7.8-7.9) in addition to a recent activation of the area." (June 15, 2005)

 

 

In the previous issues this summary had detailed the lull in major seismic global activity preceding today's event (see summaries and updates for December 1-5 for details). This earthquake at M 7.0 is a "major event" earthquake" and occurs 102-103 days after the last earthquake of M 6.9 in Tonga on August 26, 2024, not quite breaking the length of the previous quiet period of 103-104 days in 2019.

 

When a slightly smaller event of M 6.9 hit the coast of Northern California on March 10, 2014, this summary noted the strong quiet period preceding it as:

 

"A strong earthquake of M 6.9 hit off the coast of Northern California early on March 10 (March 9 local time). NEIC reported this earthquake was widely felt along the coast of northern California. Maximum intensity V was felt at Blue Lake and Samoa with intensity IV at Eureka, Ferndale, MacKinleyville, North Bend, Whitethorn, Trinidad, Rio Dell, Loleta, Hydesville, Barberville, Fortuna, Ferndale, Bayside, Arcata, Littleriver, California. Intensity II-III was felt in Brisbane, Daly City, Billbrae, San Gregorio, San Francisco, Oakland, Albany, San Rafael, Bodega, Inverness, Mill Valley, Aptos, Boulder Creek, Santa Cruz, Scotts Valley, Santa Rosa, Albion, Compiche, Elk, Fort Bragg, Guerneville, Mendocino, Ukiah, Willits, Bridgeville, Burnt Ranch, Carlotta, Crescent City, Klamath, Korbel, Myers Flat, Salyer, Somes Bar, Zenia, Davis, Esparto, Lincoln,Dutch Flat, Sacramento, Chico, Grass Valley, Magalia, Nevada City, Paradise, Quincy, Chico, Redding, Big Bar, Dunsmuir, Gerber, Hayfork, Lewiston, Mount Shasta, Palo Cedro, Weaverville, Crescent City, Klamath, Point Arena and San Mateo. It was also felt in Oregon with intensity IV in North Bend and II-II in Klamath Falls, Selma, O'Brien, Grants Pass, Cave Junction, North Bend, Gold Beach, Brookings and Eugene. A foreshock of M 3.3 occurred about 15 minutes before the mainshock but was not reported felt in the area. A smaller foreshock occurred about noon today. NEIC reported this earthquake of M 2.6 off the coast of Northern California  was felt with intensity II-III in the area(s) of Rio Dell, California.

 

This is the strongest earthquake to hit off northern California since an M 7.2 on June 15, 2005 and an M 7.1 on September 1, 1994. A series of events in July and August, 1991 and on April 25, 1992 registered M 6.9-7.1 in the area. It is also the strongest earthquake in the United States outside Alaska since the Easter Day earthquake in Baja California of April 4, 2010. The epicenter of that event, however was not within the borders of the U.S. and the last event within the U.S. territorial borders were the events of June 2005 and September 1994.

It is also the strongest earthquake in the world since an event of M 7.8 in the Scotia Sea on November 17, 2013." (March 11, 2014)

 

Following the M 6.9 in 2014, this summary reported the following far-field triggering relations in the following two months. It is likely that these areas will be equally likely to see enhanced seismicity from the M 7.0 on December 5, 2024:

 

Antipodal (~180 degrees)

Coast of Northern California to Southern Indian Ocean

 

Outer shadow zone edge (141-148 degrees)

Coast of Northern California to Comores Islands,

 

Node 3 (120 degrees)

Coast of Northern California to Balleny Is, Sumba, Bali, South Georgia, Java, Nicobar Islands, Sumatra, 

 

Inner shadow zone edge (101-110 degrees)

Coast of Northern California to Celebes, Turkmenistan, Assam, India, China, Iran, Mid-Atlantic, New Zealand, Myanmar, Ceram, Halhahera, Molucca, Cyprus, Crete, Greece, Ceram, Christchurch, New Zealand, Molucca, Afghanistan, Caucasus, Irian Jaya, Mindanao,  

 

Node 4 (90 degrees)

Coast of Northern California to Algeria, New Guinea, Romania, Kermadec Is. New Ireland, Algeria, Central Chile, Spain, Taiwan, Algeria, Morocco, China, Bismarck Sea, Serbia, New Guinea, Central Mid-Atlantic

 

Node 5 (72 degrees)

Coast of Northern California to England, Azores, Tokyo, Japan, Tonga, Samoa, North Sea, Southern Peru, Siberia

 

Node 6 (60 degrees)

Coast of Northern California to Southern Kuril Islands, Colombia, Ecuador, northern Peru

 

Node 7 (52 degrees)

Northern California to coast of Panama, Dominican Republic, Puerto Rico, Kamchatka, South of Panama

 

It is of some interest that the M 7.0 in California, the M 5.6 in the Fox Islands and an M 5.1 in the East Pacific Rise today all are at 72 degrees (node 5) from the previous event of major size - the M 6.9 in Tonga of August 26, 2024.  This distance often shows far field triggering from major events.

 

Following is a listing of events in this series of M>=4 that occurred today.  A more extensive listing can be found in the "CALIFORNIA" section of this summary.

 

Forecast 167906 had expected enhanced seismicity in this region within about 20 km of the mainshock epicenter was likely around December 3-7, 2024.

 

O: 05DEC2024 21:47:11  40.3N  124.9W ML=4.2  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 05DEC2024 18:44:23  40.4N  125.0W Mw=7.0  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 05DEC2024 18:44:23  40.4N  125.0W Mw=7.3  JTWC   OFFSHORE NORTHERN CALIFORNIA

O: 05DEC2024 18:46:27  40.4N  125.0W ML=4.7  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 05DEC2024 19:10:05  40.5N  125.1W ML=4.0  EMSC   OFFSHORE NORTHERN CALIFORNIA

P:  3DEC2024 167906    40.3N  125.2W 2.5-4.6 AAAAA  Off Coast of No. Calif     

P:  7DEC2024 167906    40.7N  124.6W 2.5-4.7 AAAAA  Off Coast of No. Calif     

 

The mainshock off northern California was also accompanied by an M 4,2 several minutes later in Utah. This coincidence has been noted in this summary previously. For example when an M 5.7 occurred in northern Utah on March 18, 2020 and was followed several hours later by an M 5.2 off the coast of northern California this summary noted:

 

 

"A moderate earthquake was also felt in Northern California today. This event of M 5.0-5.2 occurred near the coast and was felt with maximum intensity VI in Ferndale and Scotia according to data from NEIC. Intensity V shaking occurred in California at Rio Dell, Fortuna and Eureka and IV in Petrolia and Hydesville with lesser shaking in Loleta, Carlotta and Myers Flat. Light shaking was reported as far as Central California and southern Oregon. Several light aftershocks followed. This is probably a regional aftershock of the M 5.8 which hit the area to the west on March 9, 2020 in a regional activation from Alaska to southern California. This summary had noted this at the time" (March 18, 2020)

 

Forecasts 167617 and 167882 had expected this area of Utah would be active

at the end of November or early December, 2024.

 

O:  5DEC2024 18:45:50  38.5N  112.9W ML=4.2  EMSC   UTAH                         

P:  5DEC2024 167882    39.8N  112.7W 2.0-4.2 AAAAA  Utah area                  

P: 24NOV2024 167617    38.7N  112.6W 2.0-4.1 CAAAA  Utah area                  

 

A regional foreshock occurred about an hour before the M 7.0 off Northern California. This event of M 3.6 off the coast of Baja California was reported by NEIC to have been felt with intensity up to III in California at La Mesa, El Cajon and II in Chula Vista, Imperial Beach, Ramona, San Diego and Spring Valley, California. The last earthquake within about 100 km with larger magnitude of this event off Baja California was recorded on October 20, 2022 with M 3.8. An M 4.4 was recorded about 100 km northwest of today's epicenter on January 15, 2024. At that time this summary noted:

 

 

 

"A moderate earthquake of M 4.4 also occurred today in the area of Southern California south of San Clemente Island where NEIC reported it was felt with intensity up to IV. EMSC reported moderate shaking in San Diego, Irvine, Redondo Beach, Torrance, Lake Elsinore, California and in Mexico at Jardines de Chapultepec.   The last earthquake off the coast of southern California within about 100 km  of today's epicenter with M>=4.4 occurred on October 16, 2005 with M 4.9.  An M 4.4 also occurred about 100 km to the east on February 1, 2010. But most moderate activity in this region is located more than 100 km to the west or east of today's epicenter." (January 15, 2024)

 

Forecast 167869 had expected enhanced seismicity in this region of Baja California was likely within about 100 km around December 7.

 

 

O:  5DEC2024 17:53:23  32.0N  117.7W ML=3.5  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P:  7DEC2024 167869    32.9N  117.6W 2.5-4.7 AAAAA  So. California             

 

A moderately large earthquake of M 5.6 also occurred in the Fox Islands, Aleutians, Alaska today. NEIC reported it was felt with intensity up to IV in Nikolski, Alaska. The last earthquake in the Fox Islands, Alaska of M>=5.6 was an M 6.0 on May 19, 2024. At the time this summary noted:

 

"The strongest earthquake in the world today was an M 6.0 in the Fox Islands. NEIC reported it was felt with intensity up to V in Nikolski, Alaska. This is the first earthquake in the U.S. or Canada of M>=6 in the year 2024 to date. The last such earthquake of M>=6 occurred on December 21, 2023 with M 6.1 and prior to that as a M 6.4 on October 16, 2023. Today's earthquake is also the strongest within about 200 km of today's epicenter since an M 6.8 and 6.6 on January 11, 2022." (May 19, 2024)

 

This earthquake in the Fox Islands occurred within minutes of local solar  midnight and was probably promoted by strong tidal and/or SFE. Forecast 167928 had expected enhanced seismicity within about 100 km of this epicenter was likely around December 6, 2024.

 

O:  5DEC2024 11:48:03  52.1N  170.9W MW=5.6  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  6DEC2024 167928    52.4N  169.4W 3.5-5.0 AAAAA  Fox Islands, Aleutians     

 

Several regional earthquakes of moderate magnitude in the area of the western North America also occurred today and were likely triggered by stress transfer from the M 7.0 in Northern California. The largest of these was an M 4.4 in the Vancouver Island region of Canada. This may be an aftershock of an M 6.5 that hit near this epicenter on July 11, 2024. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 6.4 in the series in Vancouver Island, British Columbia which began July 4, 2024. NEIC reported it was lightly felt with moderate intensity up to IV in Tofino, Canada. EMSC reported light shaking in Chilliwack, Canada. Several moderate aftershocks – including an M 5.4 - were also felt in this region. This summary has extensively covered this swarm in previous issues" (July 11, 2024)

 

Forecast 167916 had expected today's earthquake in the Vancouver Island

area was likely around December 6.

 

O:  6DEC2024 06:32:03  49.2N  129.0W MB=4.4  EMSC   VANCOUVER ISLAND, CANADA REGIO

P:  6DEC2024 167916    47.9N  129.1W 2.8-5.1 ABAAA  Vancouver Island area      

 

 

 

 

NEWS BULLETIN DECEMBER 5, 2024 - MAJOR QUAKE OFF NORTHERN CALIFORNIA

 

 

A major earthquake of M 7.0 occurred on December 5, 2024 near local noon off the coast of Northern California. This event occurred near the end of a C-class solar flare. It also occurred while a northeast clipper was hitting the northeastern U.S. Both of these are possible triggers for such an event. The epicenter of this earthquake is about 104-105 degrees from a series of events including an M 5.7 in southern Iran yesterday and may have been promoted by energy from that source.

 

A tsunami warning for the west coast of the U.S. was issued but tsunamis from large earthquakes in this area are not usually powerful and it is likely that any tsunami associated with today's event would be in the centimeters height range.

 

A series of moderate earthquake in the Geysers area of northern California followed the M 7.0 off the California coast. They were likely triggered by P- and/or S-waves from that earthquake.

 

Today's mainshock was reported by NEIC to have been felt with damage with intensity VIII at Redcrest and VII in Ferndale and Rio Dell. Intensity VI was reported throughout most of Northern California including at Alderpoint, Carlotta, Fortuna, Garberville, Hydesville, Loleta, Myers Flat, Scotia, Whitethorn and Six Rivers National Forest. Intensity V was felt as far as 150 km of the epicenter; IV up to 300 km as far as Oregon and III in Nevada and the remainder of California. Light shaking of II was reported in Arizona, Washington, Oregon, British Columbia, and within about 500 km of the epicenter. Earthquakes in this area can occur in pairs and can help trigger far-field seismicity, so readers are advised not to relax quite yet.

 

The last earthquake within about 200 km of today's epicenter off the coast of

Northern California with M>=7 occurred as an M 7.0-7.1 on June 15, 2005. Other  such event (all of M 7.0-7.1) in the past 35 years occurred on August 17, 1991, April 25, 1992,  and September 1, 1994.

 

 

EARTHQUAKE SUMMARY FOR NOVEMBER 30, 2024

 

MODERATELY STRONG QUAKES IN RYUKYU ISLANDS

 

The strongest earthquake in the world today was an M 5.7 in the Ryukyu Islands, Japan. NEIC reported it was felt with intensity III in Chatan Okinawa, Japan. It was accompanied by foreshocks of M 4.8 and an aftershock of M 5.2, among others which were also felt lightly in the Ryukyu Islands. It is likely that these earthquakes were triggered by solar flares 3200 and 3210 - the largest flares of the day - as they occurred near the peak of both flares. SWPC flare data for these events follows:

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

 

3200       0837   0851      0859   C4.3      (November 30, 2024)   5.3E-03  

Ryukyu Is. M 5.7 08:46 UT

 

3210       0859   0906      0912   C9.3      (November 30, 2024)   5.9E-03      

Ryukyu Is. M 5.2 09:07 UT

Today's earthquake of M 5.7 in the Ryukyu Islands is the strongest within about  200 km of this epicenter since an M 5.7 on October 16, 2023. At the time this summary noted:

 

 

"A moderate earthquake of M 5.7 in the Southwestern Ryukyu Islands also occurred today. It was followed by a number of moderate aftershocks including one of

M 4.7. This is the strongest activity in the Ryukyu Islands within about

200 km since an M 6.3 about 150 km north of these epicenters on September 18, 2023 and may be regional aftershocks of that event." (October 16, 2023) 

 

Forecasts 167831 and 167558 had expected today's event was likely in late November or early December within this area.

 

O: 30NOV2024 08:46:16  25.3N  126.0E MW=5.7  EMSC   RYUKYU ISLANDS, JAPAN        

O: 30NOV2024 17:19:19  26.2N  125.7E mb=4.6  EMSC   NORTHEAST OF TAIWAN

P:  3DEC2024 167831    25.0N  127.0E 4.0-5.4 BAAAA  Ryukyu Islands             

P: 24NOV2024 167558    25.0N  127.0E 4.0-5.4 CAAAA  Ryukyu Islands             

 

 

An M 5.4 was also located today in the region of western Mexico near the Revilla Gigedo Islands. NEIC reported light intensity was felt in Jalisco, Mexico at Puerto Vallarta and in Mexico at Tlalnepantla. This is the strongest earthquake near Revilla Gigedo Island, Mexico since an M 5.5 on September 5, 2021. At the time this summary noted:

 

 

"The last earthquake of M>=5.9 within about 200 km of today's epicenter in the Revilla Gigedo Islands, Mexico occurred as an M 6.3 on November 1, 2011. Forecasts 117968 and 117992 had expected today's event within about 50 km of the epicenter was likely around August 14-17. Earthquakes in this area can stress faults to the north, but as this was triggered by TS Henriette, this is much less likely to trigger additional seismicity in the Gulf of California." (August 14, 2019)

 

Forecasts 167792 and 167549 had expected today's event within about 100 km was likely at the end of November or early December.

 

O: 30NOV2024 15:08:51  19.4N  108.5W MW=5.4  EMSC   REVILLA GIGEDO ISLANDS REGION

P:  2DEC2024 167792    19.0N  109.0W 3.5-5.4 AAAAA  Coast of Jalisco, Mexico   

P: 22NOV2024 167549    20.0N  109.0W 3.5-5.2 CAAAA  Gulf of California         

 

This epicenter is located at the antipode of Tropical Cyclone Bheki as it reached maximum wind strengths in the South Indian Ocean about a week ago and may may been enhanced by antipodal stresses associated with that storm. Initial data from NHC for this storm follows:

 

"TROPICAL CYCLONE BHEKI (02S)                   

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TC    BHEKI    2024-11-17  00:00 UT  16.0S   70.7E  135 kts  South Indian Ocean  

 

Tropical Cyclone Bheki (02S0) continued today in the area of the south Indian Ocean with winds up to 135 kts.  It is expected to track to the south and west over the next several days. South Indian Ridge systems may be activated as this storm passes overhead. The antipode is at 14N 108W south of Jalisco, Mexico and near the East Pacific Rise. These areas could see enhanced seismicity as this storm moves to the southwest over the next three days." (November 22, 2024)

 

and

 

Tropical Cyclone Bheki (02S0) continued today in the area of the south Indian Ocean with winds up to 90 kts.  It is expected to track to the  WSW over the next several days. South Indian Ridge systems may be activated as this storm passes overhead. The antipode is at 14N 108W south of Jalisco, Mexico and near the East Pacific Rise. These areas could see enhanced seismicity as this storm moves to the southwest over the next three days." (November 21, 2024)

 

The Mexican event may also have been promoted by SFE associated with solar flare (SWPC # 3270) as  it occurred towards the end of that flare. Data from SWPC for this flare follow:

 

SOLAR FLARES

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

3270       1444   1453      1505   C2.1      (November 30, 2024)   1.0E-03  

Tonga M 4.6 14:48 UT

Gulf of California M 4.2 15:02 UT

Banda M 4.4 15:06 UT

Tonga M 4.7 15:06 UT

Revilla Gigedo Islands, Mexico M 5.4 15:08 UT

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.0-4.2 in Hawaii. NEIC reported it was widely felt with intensity III in Hawaii at Captain Cook, Hakalau, Honokaa, Honomu, and II in Hawaii National Park, Hawi, Hilo, Holualoa, Honaunau, Kailua Kona. NEIC reported an aftershock of M 3.1 in Hawaii was felt with intensity up to IV in the area(s) of Hawaii at Naalehu and II in Volcano.  EMSC reported M 4.2 was felt as a quick jolt at Honokaa and Kailua Kona, Hawaii. Forecast 167527 had expected today's event in Hawaii was likely around November 28.

 

O: 30NOV2024 18:40:35  19.5N  155.4W ML=4.2  EMSC   ISLAND OF HAWAII, HAWAII     

P: 28NOV2024 167527    19.9N  156.1W 3.0-4.7 AAAAA  Hawaii                     

 

The world is closing in on a modern global earthquake record. The last earthquake considered to be of major category (M>=6.9) in the NEIC catalog occurred on August 26, 2024 with M 6.9. This quiet length will reach 100 days on

December 3, 2024 without such an earthquake, a remarkable period of quiet seismicity for the world as a whole. The end of such periods often  identify a shorter period of strong activity releasing the pent up stress accumulated during the quiet period. Following is a listing of the quietest periods since 1990. The first number in Table 1 below is the rank among quiet periods, the second the period in days of the beginning of the quiet; the third is the date of the start of the period and the fourth is the date of the next event in the world of M>=6.9. The listing covers quiet periods of two months or longer since 1990.

 

TABLE 1: NOTABLE EARTHQUAKE QUIET PERIODS (1990-2024)

 

RANK DAYS Q FIRST DAY LAST DAY

 

01 104.2 (8-2-2019 11-14-2019)

02 100.0 (8-25-2024 Not finished)

03 92.6 (5-4-2018 8-5-2018)

04 90.7 (11-15-2014 2-13-2015)

05 86.2 (4-2-2024 6-28-2024)

06 85.4 (3-25-2020 6-18-2020)

07 83.0 (10-30-2020 1-21-2021)

08 81.0 (8-20-1998 11-9-1998)

09 79.1 (11-25-2013 2-12-2014)

10 78.9 (7-13-1991 9-30-1991)

11 77.3 (3-28-2005 6-13-2005)

12 76.8 (12-29-2021 3-16-2022)

13 75.1 (11-14-2019 1-28-2020)

14 69.7 (3-17-2003 5-26-2003)

15 68.5 (5-21-2021 7-29-2021)

16 66.5 (3-1-2019 5-6-2019)

17 66.3 (12-27-1991 3-2-1992)

18 65.7 (8-12-1990 10-17-1990)

19 64.2 (11-17-2002 1-20-2003)

20 63.1 (4-26-2002 6-28-2002)

21 63.1 (7-19-1997 9-20-1997)

22 62.9 (2-24-2001 4-28-2001)

23 62.5 (5-28-2016 7-29-2016)

24 62.4 (3-20-2021 5-21-2021)

25 62.1 (6-15-1999 8-17-1999)

26 61.9 (5-16-2006 7-17-2006)

27 61.5 (5-26-2022 7-27-2022)

28 61.1 (1-22-2024 3-23-2024)

 

It is notable that many of the periods of strongest quiescence occur in the  northern summer into late fall. These included the current period (rank 2) and the nearly identical Period of August to November, 2019 (rank 1). Other similar by shorter periods occurred in 1991 (#10), 1990 (#18), 1998 (#8). Only one such quiet period begins in January or February and there are none of these which begin in September. The list of beginning of quiet period follows:

 

TABLE 2: NUMBER OF NOTABLE EARTHQUAKE QUIET PERIODS (1990-2024)

 

Beginning of quiet Periods

Month  Number of periods

 

DEC    2

JAN    1

FEB    1

MAR    5

APR    2

MAY    5

JUN    1

JUL    2

AUG    3

SEP    0

OCT    1

NOV    4

 

End of quiet Periods

Month  Number of periods

 

DEC    0

JAN    3

FEB    2

MAR    3

APR    1

MAY    3

JUN    4

JUL    4

AUG    2

SEP    2

OCT    1

NOV    2

 

Of all quiet periods of any length the most active (least number of days) occurs in February-March with 192 in those four months, and the most quiet from August through November with 223 in those four months.

 

This seasonal pattern of general global seismicity suggests a seasonal trigger. One such could be weather patterns during which major storms over oceans in the northern hemisphere occur in the months when there is quiet seismicity at these magnitude. A hypothesis would be consistent with these data is that major storms can trigger smaller earthquakes leaving the larger earthquake - as in this study -  to occur later leading to the pattern observed. Such an earthquake would most likely occur in conjunction with a solar flare and/or near local solar noon or local solar midnight when tidal stresses maximize and perhaps near the date of the new or full moon and would probably be preceded by foreshocks warning of the time of the quake. It would likely be followed by a series of strong global events in a short period (a couple of weeks) using up pent up seismic energy around the world. Major weather events such as clippers or nor'easters in the U.S. or ocean typhoons or hurricanes could also help trigger such an earthquake.

 

 

HOUSECLEANING

 

As you know, this summary has fallen way behind in the formal daily documents.

To some extent this has been alleviated by the addition of an "COMING ATTRACTIONS" section. But this does not include actual data which is often delayed as to the position and magnitude of earthquakes. These then need to be converted into a formal daily report which, by the time the reader gets it is more historical and not relevant to current conditions. With this report it is hoped the summary will catch up to recent events. Formal reports of past days will continue as time permits, but the focus will be on recent events and possibilities.

 

In addition, this summary will also begin to include some statistical discussion and analyses of data presented in this summary for the past 25 years. It is hoped this will allow the reader more sophisticated insight into earthquakes and  earthquake occurrence.

 

 

MODERATE M 5.3 IN TONGA ON QUIET DAY

 

EARTHQUAKE SUMMARY FOR NOVEMBER  1, 2024

 

Global seismicity was at quiet levels today. The strongest earthquake in the world today was an M 5.3 in Tonga - the only event of M>5 today. It was not felt in this remote area.

 

Forecast 167446 had expected this event within about 50 km was likely around November 4.

 

O:  2NOV2024 05:03:55  17.9S  178.5W MB=5.3  EMSC   FIJI REGION                  

P:  4NOV2024 167446    18.0S  178.0W 4.0-5.6 AAAAA  Tonga Islands               

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in the Kodiak region of southern Alaska. NEIC reported this earthquake of M 4.4 in Southern Alaska was felt with intensity up to III in the area(s) of Southern Alaska near Aleneva.  The last earthquake of M>=4.4 in the Kodiak region was an M 4.5 on January 25, 2023. At that time this summary noted:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.5 in the Kodiak Island region of Alaska. This is the strongest earthquake in the Kodiak Island area since an M 4.6 on October 12, 2022. The only earthquakes of significantly larger magnitude in the Kodiak area in the past 2.5 years was an M 4.9 on January 3, 2021 and an M 4.8 on January 11, 2022." (January 25, 2023)

 

Forecast 167424 had expected today's event in the Kodiak Island area was likely to the north of this epicenter in early November.

 

O:  2NOV2024 03:37:26  58.6N  153.5W ML=4.4  EMSC   KODIAK ISLAND REGION, ALASKA 

P:  5NOV2024 167424    60.0N  153.5W 3.2-5.0 BAAAA  Central Alaska             

 

An unusually large M 4.2 also occurred in Western Texas today. NEIC reported this earthquake of M 4.2 in Western Texas was felt with intensity up to IV in the area(s) of Western Texas in Whites City, New Mexico. The last earthquake of M>=4.2 in western Texas within about 150 km of today's epicenter occurred on July 23, 2024 with M 4.2. At the time this summary noted:

 

 

"The strongest and most unusual earthquake in the U.S. or Canada today was an M 4.9 in Central Texas. NEIC reported it was felt with intensity up to M 4.9 in Hermleigh, Texas and later by an M 4.4 north of Hermleigh. EMSC reported a hard shake in Texas was felt in Sweetwater, Snyder, Midland, Weatherford, Willow Park, Denton, Frisco. It was preceded by an M 4.2 in western Texas west of this epicenter (probably triggering the larger, later event. NEIC reported it was felt with intensity up to V in the epicentral area near Whites City, New Mexico." (July 23, 2024)

 

Forecast 167064 had expected today's event was likely in Western Texas at the end of October or early November, 2024.

 

O: 02NOV2024 01:11:59  31.7N  104.5W ML=2.4  EMSC   WESTERN TEXAS

O: 02NOV2024 01:39:39  31.7N  104.4W ML=2.9  EMSC   WESTERN TEXAS

O: 02NOV2024 01:48:54  31.7N  104.4W ML=3.0  EMSC   WESTERN TEXAS

O: 02NOV2024 03:24:23  31.7N  104.4W ML=2.0  EMSC   WESTERN TEXAS

O:  2NOV2024 01:36:48  31.7N  104.4W ML=4.1  EMSC   WESTERN TEXAS                

P: 27OCT2024 167064    32.6N  103.6W 2.0-4.2 BAAAA  SW U.S.A                   

 

 

MODERATE QUAKES IN TAIWAN AND NORTH ATLANTIC RIDGE

 

EARTHQUAKE SUMMARY FOR OCTOBER 31, 2024

 

 

The strongest earthquake in the world today was an M 5.4 in the northern Mid-Atlantic Ridge. It may have been lightly felt in this epicentral region. The last earthquake of M 5.4 within about 200 km of this epicenter was an M 5.4 on February 5, 2024 and  the last of larger magnitude in this area was an M 5.7 on January 21, 2023 and an M 5.9 on March 10, 2019. At the time this summary noted:

 

 

"A series of moderate to moderately strong earthquakes occurred today in the northern Northern Mid-Atlantic Ridge in the Reykjanes area. The strongest of these was an M 5.8 preceded by events of M 5.2 and 5.3. These events were not reported felt in this remote area and were probably associated with volcanism on the Reykjanes Ridge. The M 5.8 is the strongest earthquake within about 200 km of this epicenter since an M 5.9 on September 10, 2017. No other such events have hit the area in the past 30 years." (March 10, 2019)

 

Forecast 167481 had expected enhanced seismicity within about 200 km of this epicenter was likely in early November, 2024.

 

O:  1NOV2024 05:38:15  56.5N   34.0W MW=5.4  EMSC   REYKJANES RIDGE              

P: 12NOV2024 167481    56.0N   30.0W 4.0-5.7 CACAA  North Mid-Atlantic Ridge   

 

The strongest earthquake in the world today felt in the epicentral area was an M 5.2 in Taiwan. It was widely felt throughout Taiwan. EMSC reported it was felt in the Gushan District of Kaohsiung, Taiwan. This earthquake occurred as a strong typhoon - Kong-Rey - passed over this epicenter. In the previous issue of this summary this typhoon had been expected to enhance seismicity in Taiwan at this time as:

 

"Typhoon KONG-REY continued today in the area of Taiwan with winds up to 125 kts and is likely to track to the north and east for the next several days, It is tracking to the northeast. Enhanced seismicity in the region of Taiwan and the Ryukyu Islands of Japan as this system intensifies and moves into that area. Enhanced seismicity in Taiwan is expected around October 30 - November 3. Enhanced seismicity in central Honshu is also considered likely in late October or early November." (October 31, 2024)

 

STRONG EARTHQUAKE FOLLOW MODERATELY STRONG SOLAR FLARES

 

EARTHQUAKE SUMMARY FOR OCTOBER 30, 2024

 

 

A strong M7.2 solar flare (#3410) occurred today beginning as a C5.4 at 20:14 UT (#3390) as an earthquake of M 6.0 hit off the coast of Oregon  and continuing until about 21:14 UT as an M7.2 flare with the following preliminary paramaters from SWPC:

 

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

 

3390       2014   2022      2029   C5.4      (October 30, 2024)   5.5E-03  

3410       2029   2053      2114   M7.2      (October 30, 2024)   1.1E-01  

Fox Is. M 3.5 20:24 UT

Fox Is. M 3.7 20:24 UT

Coast of Oregon M 6.0 20:15 UT

Northern Philippines M 4.7 21:39 UT

Idaho M 2.5 21:14 UT

 

An earthquake of M 6.0 occurred minutes into the time of occurrence of these flare off the coast of Oregon. This earthquake occurred within several minutes of local solar noon and was likely triggered by Solar Flare Effects (SFE) from this flare which maximize near local solar noon. It also occurred shortly about an hour after a strong Gamma Ray Burst. Both the flare and the M 6.0-6.1 earthquake may have been triggered by energy flux associated with the Gamma Ray Burst (GRB #241030).

 

The last earthquakes within about 200 km of today's epicenter with M>=6 occurred  with M 6.3 on August 29, 2019 and M 6.2 on August 22, 2018. Only one other such event has hit the area in the past 15 years - an M 6.0 on April 11, 2012. At the time of the 2019 event this summary noted:

 

 

"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." (August 29, 2019)

 

More recently on September 2, 2024 this summary reviewed recent seismicity in the area as:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.2 off the coast of Oregon. NEIC reported this earthquake of M 4.2 off the coast of Oregon was felt with intensity up to II in the area(s) of Oregon in Portland.  This area has been relatively quiet in recent months. The last earthquake of M>=4.2 occurred on May 4, 2024 with M 4.3. The last of significantly larger magnitude was an M 5.7 on March 27, 2024. At the time this summary noted:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 5.7 off the coast of Oregon. NEIC reported it was felt with intensity up to III along the coast of Oregon, especially in the Port Orford area. EMSC reported light shaking in Springfield, Oregon. A foreshock of M 3.0 hit the area within minutes of local solar noon about 12 hours earlier and was felt in the Port Orford, Oregon area.  These earthquake occurred near local solar noon and midnight and may have been promoted by tidal stresses with the full moon" (March 27, 2024, September 2, 2024)

 

Strong Earthquakes off the coast of Oregon and Northern California often occur together in periods of regional activation of the west coast of the U.S. and Canada as previously described in this summary. Light earthquakes in the Fox Islands, Aleutians also occurred today about 9 minutes of the M 6.0 offshore Oregon and may have been promoted by seismic waves from Oregon. These events in Alaska are at 27.5 degrees from the Oregon epicenter and occurred as the surface wave and the S-phase body waves were passing through the Fox Islands. It is likely they were triggered by these seismic phases from Oregon.

 

Forecast 167389 had expected today's event off Oregon was likely in late October or early November within about 50 km of today's epicenter.

 

O: 30OCT2024 20:15:20  43.6N  127.9W MW=6.0  EMSC   OFF COAST OF OREGON          

P:  5NOV2024 167389    43.8N  128.4W 3.0-4.4 BAAAA  Off Coast of Oregon        

 

A strong earthquake of M 6.0 was also felt today in Papua New Guinea. NEIC reported it was felt with intensity III in West New Britain, PNG at Kimbe. Like the M 6.0 in Oregon today, this epicenter was closely associated with a moderate solar flare (#3330) and may have been promoted by SFE associated with that flare. Data on this flare from SWPC are listed below:

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

3330       1157   1204      1215   C4.6      (October 30, 2024)   4.7E-03  

New Britain M 6.0 12:18 UT

 

The last earthquake in New Britain of M>=6 occurred on April 14, 2024 with M 6.5 to the north of today's epicenter - the largest in the past four years in the area. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 6.5 in Papua New Guinea. NEIC reported it was felt with intensity up to VI in Kimbe, New Guinea. The last earthquake within about 250 km of this epicenter in New Guinea with M>=6.5 occurred on May 14, 2019." (April 14, 2024)

 

Forecasts 167252 and 166964 had expected today's activity within about 100 km was like around October 28-November 4, 2024.

 

O: 30OCT2024 12:18:52   4.4S  150.1E MW=6.0  EMSC   NEW BRITAIN REGION, P.N.G.   

P:  4NOV2024 167252     5.0S  151.0E 4.0-5.4 BAAAA  New Ireland                

P: 28OCT2024 166964     6.0S  150.0E 4.0-5.6 ABAAA  New Ireland                

P: 28OCT2024 166964     6.0S  151.0E 4.0-5.4 ABAAA  New Ireland                

 

An unusual earthquake of M 4.3 occurred in Egypt today. NEIC reported it was felt with intensity IV in al-Bad' Tabuk, Saudi Arabia and El Tur, South Sinai, Egypt and in III in Luxor, Egypt. EMSC reported it was felt with moderate shaking in Sharm El Sheikh, Egypt at Tagamoat Sakania, and Qesm 2nd Hurghada.

Earthquakes near this epicenter of similar or larger magnitude have most recently occurred as an M 4.7 on December 27, 2022 and an M 4.3 on May 16, 2023. At the time this summary noted:

 

 

"An unusual earthquake of M 4.7 hit the southern end of the Red Sea, Egypt today. NEIC reported it was felt with intensity V in South Sinai, Egypt at El Tur and in Ras Gharib with III in Hurghada, Asyut, El Faiyum, El Asher, Cairo and Luxor. It was also felt with III in Saudi Arabia and Jordan. Moderate earthquakes in this area are rare and tend to be limited to late Spring months - late May to early June so today's event in December is the first event of M>=4.7 from August through December in at least 22 years. Other such events in the Spring cycle occurred in June, 2015, June, 2013 and June, 2003. The last such events occurred as an M 5.4 on June 16, 2020 and an M 5.0 on May 16, 2016. It is possible this is related to flooding and water loading associated with winter melting at high elevations." (December 27, 2022) 

 

Forecast 167085 had expected regional seismic enhancement in the area in late

October, 2024.

 

O: 31OCT2024 04:35:02  28.3N   34.3E MB=4.3  EMSC   EGYPT                        

P: 29OCT2024 167085    34.0N   29.0E 3.5-5.1 ACCAA  Turkey                     

 

 

 

STRONG QUAKE OFF OREGON FOLLOWS MAJOR SOLAR FLARE

 

EARTHQUAKE SUMMARY FOR OCTOBER 29, 2024

 

 

A strong M7.2 solar flare occurred today beginning about 20:10 UT with the following preliminary paramaters from SWPC:

 

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

XXXX       2010   2053      2114   M7.2      (October 30, 2024)   1.1E-01  

Off coast of Oregon M 6.0 20:15 UT

 

 

An earthquake of M 6.0 occurred minutes into the time of occurrence of this flare off the coast of Oregon. This earthquake occurred within several minutes of local solar noon and was likely triggered by Solar Flare Effects (SFE) from this flare which maximize near local solar noon.

 

 

The last earthquakes within about 200 km of today's epicenter with M>=6 occurred  with M 6.3 on August 29, 2019 and M 6.2 on August 22, 2018. Only one other such event has hit the area in the past 15 years - an M 6.0 on April 11, 2012. At the time of the 2019 event this summary noted:

 

 

"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." (August 29, 2019)

 

More recently on September 2, 2024 this summary reviewed recent seismicity in the area as:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.2 off the coast of Oregon. NEIC reported this earthquake of M 4.2 off the coast of Oregon was felt with intensity up to II in the area(s) of Oregon in Portland. This area has been relatively quiet in recent months. The last earthquake of M>=4.2 occurred on May 4, 2024 with M 4.3. The last of significantly larger magnitude was an M 5.7 on March 27, 2024. At the time this summary noted:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 5.7 off the coast of Oregon. NEIC reported it was felt with intensity up to III along the coast of Oregon, especially in the Port Orford area. EMSC reported light shaking in Springfield, Oregon. A foreshock of M 3.0 hit the area within minutes of local solar noon about 12 hours earlier and was felt in the Port Orford, Oregon area.  These earthquake occurred near local solar noon and  midnight and may have been promoted by tidal stresses with the full moon" (March 27, 2024, September 2, 2024)

 

Strong Earthquake off the coast of Oregon and Northern California often occur together in periods of regional activation of the west coast of the U.S. and Canada as previously described in this summary.

 

 

A moderate earthquake of M 4.2 occurred off Nova Scotia today. EMSC reported this earthquake of M 4.2 in the North Atlantic east of Nova Scotia was felt with intensity up to IV in the area(s) of the North Atlantic east of Nova Scotia was not felt.

 

 

MODERATE EARTHQUAKE SERIES NORTHWEST OF LOS ANGELES, CALIFORNIA

 

EARTHQUAKE SUMMARY FOR OCTOBER 28, 2024

 

An unusual series of earthquakes, including an M 3.6 was felt west of Los Angeles, California today. These events were widely felt in the Lompoc, California with  intensity up to V. It was reported with maximum intensity V in Southern California at Lompoc and II-III in Burbank, San Luis Obispo, Buellton, Oceano, Santa Maria, Torrance, Altadena, Chatsworth, Santa Barbara, New Cuyama, Los Osos and others. The last earthquakes within about 100 km of today's epicenter with equal or larger magnitude occurred as an M 3.6 on April 17, 2023 and M 3.9 on September 6, 2020. At the time this summary noted:

 

 

"An earthquake of M 3.8 followed the event in Coquimbo, Chile west of Los Angeles, California. NEIC reported this unusual event was felt with intensity II-III in southern California at Solvang, Goleta, Santa Ynez, Los Olivos, Buellton, Santa Barbara and Lompoc. This epicenter is at 79 degrees from and 33 minutes after Coquimbo. Seismic waves from that source such as SSS and surface phases may have helped trigger the event in southern California. This is the strongest earthquake in the region within about 100 km and west of Santa Barbara since an M 3.8 on January 7, 2018." (September 6, 2020)

 

Forecast 167035 had expected enhanced seismicity in this area at the end of October.

 

O: 28OCT2024 07:45:18  34.6N  120.5W ML=2.4  EMSC   CENTRAL CALIFORNIA           

O: 28OCT2024 07:49:24  34.6N  120.5W ML=3.5  EMSC   CENTRAL CALIFORNIA

O: 28OCT2024 08:09:01  34.6N  120.5W ML=2.0  EMSC   CENTRAL CALIFORNIA

P: 31OCT2024 167035    36.1N  120.1W 2.5-4.6 BBAAA  Central California         

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 in the Vancouver Island region of Canada. It was not reported felt in this remote area. This is the strongest earthquake within about 150 km of this epicenter since an  M 4.2 on September 18, 2024 and an M 6.5 on September 15, 2024 and is about 50 km southwest of that epicenter. At the time this summary noted:

 

 

"The last earthquake in the Vancouver Island area of M>=6 was an M  6.5 on July 4, 2019  with the regional seismic activation of early July, 2019. A swarm  hit southeast of today's events on October 22, 2018 (M 6.8, 6.5, 6.5) and in January,  2008 (M 6.4, 6.0 ..) and September 2013 (M 6.0, 6.0, 6.1)." (December 23, 2019, September 17, 2023, September 15, 2024)

 

Forecast 167143 had expected today's event was likely within about 50 km around

October 27, 2024.

 

O: 28OCT2024 13:24:27  50.9N  130.8W MB=4.1  ECAN OF PORT HARDY, BC  

O: 28OCT2024 13:24:27  50.9N  130.8W ML=4.1  EMSC   VANCOUVER ISLAND, CANADA REGIO

P: 27OCT2024 167143    50.5N  130.4W 3.0-5.2 AAAAA  British Colombia           

 

MODERATE EARTHQUAKE IN CENTRAL TURKEY

 

EARTHQUAKE SUMMARY FOR OCTOBER 27, 2024

 

 

The strongest earthquake felt in the world today was an M 4.9-5.0 in Central Turkey. NEIC reported it was felt with intensity up to III near Feke, Turkey.

EMSC reported moderate to strong shaking in Turkey at Arslanpasa, Azapli, Sevkiye, Sehit Halis Sisman, Vedat Kocadalli, Fatah, Esenevler, Osmaniye, Cumhuriyet, Raufbey among others. The last earthquakes within about 200 km of this epicenter with M>=4.9 was reported by NEIC on August 12, 2024 and September 7, 2024 both with M 4.9-5.0. The only event in the past 1.5 years in the region occurred with M 5.5 on July 25, 2023. At the time this summary noted:

 

 

"A moderate earthquake of M 5.5 was widely felt in Central Turkey today. NEIC reported it was felt with maximum intensity VI in Kozan, Adana and Kadirli, Osmaniye with IV in Osmaniye, Yahyali, Adana, Talas, Kayseri and III in Mersin, Icel, Bor Nigde and Kahramanmaras. This appears to be a long-term aftershock of the M 7.7 of February 6, 2023. An M 6.3 hit the border region of Turkey and Syria about 200 km south of this on February 20, 2023, the only earthquake in Turkey of M>5.5 since February 6. It is the strongest aftershock in the region since February 6." (July 25, 2023)

 

Forecast 167356 had expected this earthquake within about 50 km in early November.

 

O: 27OCT2024 17:07:10  37.6N   36.0E MW=4.9  EMSC   CENTRAL TURKEY               

P:  5NOV2024 167356    38.0N   36.0E 3.5-5.1 CAAAA  Turkey                     

 

An unusual series of earthquakes, including an M 3.2 occurred west of Los Angeles, California today. These events were widely felt in the Lompoc, California with  intensity up to V. It was reported with maximum intensity V in Southern California at Lompoc and II-III in Burbank, San Luis Obispo, Buellton, Oceano, Santa Maria, Torrance, Altadena, Chatsworth, Santa Barbara, New Cuyama, Los Osos and others.

 

Forecast 167035 had expected this activity in late October to the north of this epicenter.

 

O: 28OCT2024 03:55:49  34.6N  120.5W ML=3.1  EMSC   CENTRAL CALIFORNIA           

P: 31OCT2024 167035    36.1N  120.1W 2.5-4.6 BBAAA  Central California         

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 off Vancouver, British Columbia. It followed an earlier event of M 3.2. The last earthquake within about 100 km of today's M 4.1 was an M 4.1 on October 2, 2024. These appear to be aftershocks f an M 6.4 in the area of July 11, 2024. At the time this summary noted:

 

"The strongest earthquake in the world today was an M 6.4 in the series in Vancouver Island, British Columbia which began July 4, 2024. NEIC reported it was lightly felt with moderate intensity up to IV in Tofino, Canada. EMSC reported light shaking in Chilliwack, Canada. Several moderate aftershocks – including an M 5.4 - were also felt in this region." (July 11, 2024)

 

Forecast 167132 had expected this earthquake within about 50 km was likely around October 29.

 

O: 27OCT2024 05:20:40  48.8N  128.7W MB=3.2  ECAN of Port Hardy, BC  

O: 28OCT2024 03:11:43  48.8N  129.2W MB=4.1  ECAN OF PORT HARDY, BC              

P: 29OCT2024 167132    49.3N  129.0W 2.8-5.3 AAAAA  Vancouver Island area      

 

M 5.2 IN KERGUELEN ISLAND REGION PROBABLY TRIGGERED BY X-CLASS SOLAR FLARE

 

EARTHQUAKE SUMMARY FOR OCTOBER 26, 2024

 

 

The largest and most unusual earthquake in the world today was an M 5.2 in the South Indian Ocean. This event was not reported felt in this remote area. NEIC reported it was located SSW of Port-aux-Francais, French Southern Territories

near Kerguelan. This earthquake is the strongest within about 250 km of this epicenter since events of M 5.2-5.3 on July 28, 2007 and February 18 and 20 and March 2, 1993. Theonly event of significantly larger magnitude in the general area in the past 35 years was an M 5.7 on January 25, 1993.  The antipode of this epicenter is at 50N 111W in Alberta Canada. Moderate seismicity in this region in recent months suggests that a far-field aftershock is possible near this Alberta epicenter. This event occurred within minutes of local solar noon and was probably promoted by strong tidal and geomagnetic stresses which maximize near this hour. This earthquake in Kurguelen Islands region also occurred at the peak output of Solar Flare 2380, an X1.8 flare. The parameters for this flare from SWPC are listed below.

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

2380       0632   0719      0756   X1.8      (October 26, 2024)   8.9E-01  

Kerguelen Is. M 5.2 07:24 UT

 

O: 26OCT2024 07:23:56  50.2S   69.4E MB=5.2  EMSC   KERGUELEN ISLANDS REGION     

 

The strongest earthquakes in the U.S. or Canada today occurred off the coast of Northern California with M 4.4, 4.0 and 3.0. NEIC reported light shaking in Northern California at Novato and Eureka for these events. It was followed by aftershocks of M 3.1 and M 3.9 among others. This event occurred near local solar midnight and may have been promoted by tidal stresses which maximize near this hour.

 

Forecast 167121 had expected this event within about 50 km was likely around

October 26, 2024.

 

 

O: 26OCT2024 09:33:32  40.4N  125.7W Mw=3.9  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 26OCT2024 09:34:45  40.4N  125.5W ML=3.1  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 26OCT2024 09:23:22  40.4N  125.5W MW=4.1  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 26OCT2024 167121    40.6N  124.9W 2.5-4.6 AAAAA  Off Coast of No. Calif     

 

 

 

MODERATELY LARGE QUAKE IN  CHIAPAS, MEXICO WITH STRONG SOLAR FLARE

 

EARTHQUAKE SUMMARY FOR OCTOBER  25, 2024

 

 

A strong X-class of X2.0 occurred today starting at about 05:50 UT on October 26 and lasting for several hours and maximizing near 07:30 UT. An estimate of the parameters from SWPC for this event follow:

 

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

2380       0550   0730      1000   X1.8      (October 26, 2024)   5.1E-01

2380       0632   0719      0756   X1.8      (Ocbober 26, 2024)   8.9E-01  

Colorado M 3.4 06:29 UT

El Salvador M 4.3 06:54 UT

Kerguelen Islands M 5.2 07:23 UT

 

This is the second X-class flare in the past two weeks - since an X3.3 on October, 24, 2024 (#7930)

 

The strongest earthquake in the world today was an M 5.8 in Chiapas, Mexico. NEIC reported maximum intensity V in Chiapas at Mazatan and Frontera Hidalgo with IV shaking in Guatemala at Ayutla San Marcos and Olintepeque, Quezaltenango and II-III shaking in Ocos, San Marcos, Guatemala City and Santa Catarina Pinula and in Mexico at Colonia Alvaro, Obregon, Vicente Guerrero, Chihuahua, Acacoyagua. EMSC reported it was felt with moderate intensity in Guatemala City and Colonia Ls Floresta, Guatemala. It followed an M 1.1 solar flare (#2080) which occurred near local solar noon and my have been promoted by that flare (the strongest of the day) and strong tidal stresses which maximize near this hour. The last earthquake within about 150 km of this epicenter in Chiapas was an M 6.4 on May 12, 2024 and is probably an aftershock of that event. At the time this summary had noted:

 

"The strongest earthquake of the day was an M 6.4 near the Chiapas, Mexico-Guatemala border. NEIC reported it was felt with intensity up to VII in Brisas Barra de Suchiate, Mexico and in Quetzaltenango, Guatemala. EMSC reported strong shaking in Chiapas, Mexico at Tapachula de Cordova and Aordonez, Huixtla,

and in Guatemala at Mazatenango, Chimaltenango, Ciudad Palmares, Antigua Guatemala, San Lucas Sacatepequez, Residenciales Naciones Unidas, San Jose, Colonia Linda Vista, San Cristobal, Fuentes Del Valle, Guatemala City, Colonia Valles, De Vista Hermosa, and in San Salvador, El Salvador.  The press reported minor damage but no casualties with this strongly felt earthquake. Today's earthquake of M 6.4 is the strongest within about 200 km of this epicenter since an M 6.4 on May 17, 2023 but the last of larger magnitude in this area was an M 6.6 on February 1, 2019 and an M 8.1 on September 8, 2017. At the time of the event in September 8, 2017 this summary noted the effect of strong solar flares on the triggering of this event as:

 

 

"A great earthquake of M 8.0 (EMSC) to 8.4 (UNAM) hit the area south of Oaxaca and Chiapas, Mexico today. It was felt widely from Guatemala City to Mexico City and as far north as Belize.  This is the first earthquake in the world with M>=8.0 since an M 8.3 in  Central Chile on September 16, 2015 and prior to that an M 8.2 on April 1, 2014 in the area of northern Chile. On average there is approximately two years between great earthquakes such as this. The last earthquake of M>=8.0 within about 300 km of today's epicenter occurred on August 6, 1942 and M 8.4 on September 23, 1902 and April 19, 1902. These were M 8.3-8.4 events. This earthquake had been anticipated in previous issues of this report because of several factors including the X9.3 solar flare yesterday, tidal stresses and the severe geomagnetic storms. It occurred within about an hour of local solar midnight, a time when these effects maximize. It is also directly west of Hurricane Irma." (May 12, 2024)

 

Forecast 166987 had expected this earthquake within about 100 km in the area of Guatemala and Chiapas, Mexico.

 

O: 25OCT2024 08:29:32  14.8N   93.9W ML=4.4  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 25OCT2024 14:46:23  14.1N   92.6W MW=5.8  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 26OCT2024 166987    15.0N   92.0W 3.5-5.2 AAAAA  Guatemala                  

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in Central California near the Nevada border. NEIC reported maximum shaking of V in Nevada at Amargosa and IV in Death Valley, California with II-III felt intensity in Nevada at Beatty, Indian Springs, Pahrump, Las Vegas, Glenbrook. This continues a strong series of events in the region which began on October 24 following a strong X3.3 solar flare. Today's event occurred 20 minutes after the M 5.8 earthquake in Chiapas, Mexico (see above) and may have been triggered by S- or P- seismic waves from that source. In the previous issue of this summary the earlier M 4.7 had been discussed as:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.7 in Central California near the Nevada border and Stovepipe, California. NEIC reported it was felt with intensity IV in California in Death Valley with II-III shaking in California at Shoshone, Ridgecrest, Baker, Woodlake, Ludlow,  and in Nevada at North Las Vegas (IV), Henderson,  Beatty, Amargosa, Pahrump, Las Vegas, Indian Springs, and as far as Carmichael, California. EMSC reported light rolling motion with this earthquake in Las Vegas, Nevada. This earthquake was preceded by a series light foreshocks including an M 4.1 and an M 3.5 about 5 minutes before the mainshock. The M 4.1 foreshock was reported by EMSC to have been felt in Beatty, Nevada with slight shaking. The foreshocks and mainshock occurred within minutes of local solar midnight and may have been triggered by Solar Flare Effects (SFE) from an M2-3-class flare (with parameters listed above) combined with strong tidal stresses which maximize near this hour.

 

Today's event in Central California is the strongest within about 100 km of this epicenter since an M 4.8 on August 19, 2020 and an M 4.7-4.8 on January 6, 2022. At the time this summary noted:

 

 

"A pair of earthquakes of M 4.8 preceded the aftershock off northern California today. The first event of M 4.8 near Mina, Nevada was reported by NEIC to have been felt with intensity II-III in Nevada at Luning, Silverpeak, Gabbs, Goldfield, Hawthorne, Round Mountain (IV), Tonopah (IV) and Glenbrook and in California at Bishop and Yosemite National Park. The second about 100 km to the south of the first, occurred about an hour before and may have helped trigger the aftershock off the coast of California. These earthquakes on the border between Central California and Nevada were reported felt with maximum intensity VI in California at Big Pine and III in Independence, Bishop, Benton, Kings Canyon National Park and in Nevada at Silverpeak, Goldfield and II in Mammoth Lakes, Shaver Lake and Dunlap, California. An M 2.2 foreshock occurred near local solar noon within about 25 km of this epicenter. The last earthquake of M>=4.8 within about 50 km of this epicenter occurred on February 14, 2015 about 30 km to the south of today's epicenter on February 14, 2015, the only such earthquake in the area in the past 30 years. An M 5.7 about 100 km northeast of today's M 4.8 occurred on August 1, 1999." (January 6, 2022)

 

"A moderate aftershock of M 4.8 also was widely felt in the Ridgecrest, California aftershock zone today. NEIC reported intensity II-III in California at Death Valley, Lone Pine, Ridgecrest, Trona, Inyokern, Shoshone, Three Rivers, Kings Canyon, Porterville, and Miramonte. This earthquake is located at 104 degrees from the M 6.9 in Samar, Philippines which occurred August 18. This is a distance at which surface energy from large earthquakes concentrates due to internal reflections and refractions in the earth and can help trigger or enhance seismicity at this distance from large sources of energy on the earth's surface. This is probably the case in this instance.

 

...

 

Today's M 4.7-4.8 is the strongest aftershock to date of the M 5.8 on June 24, 2020 but occurred about 50 km east of that epicenter and may represent a new epicenter in this seismic active area." (August 19, 2020, October 25, 2024))

 

Forecast 167078 had expected this earthquake series was likely around

October 25, 2024.

 

O: 25OCT2024 07:14:28  36.6N  117.1W ML=2.3  EMSC   CENTRAL CALIFORNIA

O: 25OCT2024 07:28:27  36.6N  117.1W ML=2.4  EMSC   CENTRAL CALIFORNIA

O: 25OCT2024 07:55:37  36.6N  117.1W Mw=3.3  EMSC   CENTRAL CALIFORNIA

O: 25OCT2024 08:00:33  36.6N  117.1W ML=2.8  EMSC   CENTRAL CALIFORNIA

O: 25OCT2024 08:05:10  36.6N  117.1W Mw=4.7  EMSC   CENTRAL CALIFORNIA

O: 25OCT2024 08:47:58  36.6N  117.1W ML=2.1  EMSC   CENTRAL CALIFORNIA

O: 25OCT2024 12:42:25  36.6N  117.1W ML=2.1  EMSC   CENTRAL CALIFORNIA

O: 25OCT2024 14:52:19  36.6N  117.1W ML=2.6  EMSC   CENTRAL CALIFORNIA

O: 25OCT2024 18:42:07  36.6N  117.1W ML=2.2  EMSC   CENTRAL CALIFORNIA

O: 25OCT2024 15:04:23  36.5N  117.1W ML=4.4  EMSC   CENTRAL CALIFORNIA           

P: 25OCT2024 167078    35.9N  117.7W 2.5-4.9 AAAAA  So. California              

 

 

MODERATE EARTHQUAKE IN CENTRAL CALIFORNIA CONTINUES REGIONAL ENHANCEMENT

 

EARTHQUAKE SUMMARY FOR OCTOBER 24, 2024

 

A strong X-class of X3.3 occurred today starting at about 03:00 UT on October 24 and lasting for several hours. An estimate of the parameters from SWPC for this event follow:

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

1820       0300   0357      0428   X3.3      (October 24, 2024)   7.1E-01

2080       0723   0733      0738   M1.1      (October 25, 2024)   5.0E-03

 

This is the first X-class flare in the past two weeks - since an X1.3 on October, 29, 2024 (#7930) with the last of larger energy as an X7.1 on October 1, 2024 and an X9.0 on October 3, 2024. It occurred while the regions of Taiwan and the Philippines and Japan near 135 East longitude were at local solar noon. This is the area most likely to see enhanced seismicity related to this flare; secondarily, the area near the eastern U.S. and Canada, the Central Atlantic Ridge and the northern Caribbean were near local solar midnight at the time of this flare and could see related enhanced seismicity in the next several days. This flare is likely to reset global seismicity from the relatively quiet two previous weeks. In response to this, this summary will emphasize current seismicity for the foreseeable future. Final daily reports will be current and older unpublished reports will be produced as time permits. A major earthquake is likely at this time and is overdue since the last such event occurred more than two months ago in Tonga (M 6.9) on August 26, 2024.

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in Central California near the Nevada border and Stovepipe, California. NEIC reported it was felt with intensity IV in California in Death Valley with II-III shaking in California at Shoshone, Ridgecrest, Baker, Woodlake, Ludlow,  and in Nevada at North Las Vegas (IV), Henderson,  Beatty, Amargosa, Pahrump, Las Vegas, Indian Springs, and as far as Carmichael, California. EMSC reported light rolling motion with this earthquake in Las Vegas, Nevada. This earthquake was preceded by a series light foreshocks including an M 4.1 and an M 3.5 about 5 minutes before the mainshock. The M 4.1 foreshock was reported by EMSC to have been felt in Beatty, Nevada with slight shaking. The foreshocks and mainshock occurred within minutes of local solar midnight and may have been triggered by Solar Flare Effects (SFE) from an M2-3-class flare (with parameters listed above) combined with strong tidal stresses which maximize near this hour.

 

Today's event in Central California is the strongest within about 100 km of this epicenter since an M 4.8 on August 19, 2020 and an M 4.7-4.8 on January 6, 2022. At the time this summary noted:

 

 

"A pair of earthquakes of M 4.8 preceded the aftershock off northern California today. The first event of M 4.8 near Mina, Nevada was reported by NEIC to have been felt with intensity II-III in Nevada at Luning, Silverpeak, Gabbs, Goldfield, Hawthorne, Round Mountain (IV), Tonopah (IV) and Glenbrook and in California at Bishop and Yosemite National Park. The second about 100 km to the south of the first, occurred about an hour before and may have helped trigger the aftershock off the coast of California. These earthquakes on the border between Central California and Nevada were reported felt with maximum intensity VI in California at Big Pine and III in Independence, Bishop, Benton, Kings Canyon National Park and in Nevada at Silverpeak, Goldfield and II in Mammoth Lakes, Shaver Lake and Dunlap, California. An M 2.2 foreshock occurred near local solar noon within about 25 km of this epicenter. The last earthquake of M>=4.8 within about 50 km of this epicenter occurred on February 14, 2015 about 30 km to the south of today's epicenter on February 14, 2015, the only such earthquake in the area in the past 30 years. An M 5.7 about 100 km northeast of today's M 4.8 occurred on August 1, 1999." (January 6, 2022)

 

"A moderate aftershock of M 4.8 also was widely felt in the Ridgecrest, California aftershock zone today. NEIC reported intensity II-III in California at Death Valley, Lone Pine, Ridgecrest, Trona, Inyokern, Shoshone, Three Rivers, Kings Canyon, Porterville, and Miramonte. This earthquake is located at 104 degrees from the M 6.9 in Samar, Philippines which occurred August 18. This is a distance at which surface energy from large earthquakes concentrates due to internal reflections and refractions in the earth and can help trigger or enhance seismicity at this distance from large sources of energy on the earth's surface. This is probably the case in this instance.

 

...

 

Today's M 4.7-4.8 is the strongest aftershock to date of the M 5.8 on June 24, 2020 but occurred about 50 km east of that epicenter and may represent a new epicenter in this seismic active area." (August 19, 2020)

 

Today's event of M 4.7 is the strongest within about 100 km of today's epicenter since an M 4.8 on August 19, 2020. Forecast 167078 had expected enhanced seismicity in this region of central California was likely around October 27, 2024.

 

O: 24OCT2024 18:07:00  36.2N  117.9W ML=2.0  EMSC   CENTRAL CALIFORNIA

O: 24OCT2024 22:24:07  36.6N  117.1W ML=2.9  EMSC   CENTRAL CALIFORNIA

O: 25OCT2024 06:52:07  36.6N  117.1W Mw=4.1  EMSC   CENTRAL CALIFORNIA

O: 25OCT2024 06:52:08  36.6N  117.1W Mw=4.2  ANSS   CENTRAL CALIFORNIA

O: 25OCT2024 08:05:08  36.6N  117.1W Mw=4.7  ANSS   CENTRAL CALIFORNIA

O: 25OCT2024 06:55:24  36.6N  117.1W ML=2.5  EMSC   CENTRAL CALIFORNIA

O: 25OCT2024 04:51:02  35.6N  117.4W ML=2.1  EMSC   SOUTHERN CALIFORNIA          

P: 27OCT2024 167078    35.8N  117.6W 2.5-4.9 AAAAA  So. California             

 

A moderate earthquake of M 4.6 also occurred in Alberta, Canada today. NEIC reported this earthquake was felt lightly in Athabasca, Alberta, Canada. This is the strongest earthquake in Alberta within about 250 km of this epicenter since an M 5.0 on March 16, 2023. But this is the strongest earthquake within about 150 km of this epicenter in the past 35 years at least. It occurred near local solar noon and may have been promoted by tidal or geomagnetic stresses which maximize near this hour. Forecast 166850  had expected today's earthquake was likely in this area around October 17.

 

O: 24OCT2024 21:13:20  54.8N  118.6W MB=4.6  EMSC   ALBERTA, CANADA              

P: 17OCT2024 166850    56.0N  120.0W 2.0-4.0 CBAAA  Alberta                    

 

An earthquake of M 5.0 was also reported in Alaska today. This event (located near Nikolski, Fox Islands) was reported felt in this remote area.  A similar M 5.0 occurred in the Fox Islands on October 9, 2024 but the last of larger magnitude was an M 6.0 on July 19, 2023.  At the time this summary noted:

 

"The largest earthquake in the U.S. or Canada followed the Atacama Chile event by several hours. NEIC reported it was felt with intensity up to IV in Nikolski, Fox Islands, Alaska. It was probably promoted by energy from the earlier M 7.4 in Chile." (July 19, 2024)

 

Forecast 167142 had expected today's earthquake in the Fox Islands was likely  within about 50 km around October 24, 2024.

 

O: 24OCT2024 15:18:53  52.6N  172.0W mb=4.4  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

O: 24OCT2024 07:14:27  52.3N  170.5W MB=5.0  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 24OCT2024 167142    52.1N  171.3W 3.5-5.0 AAAAA  Andreanoff Isls, Aleutians 

 

 

 

X-CLASS SOLAR FLARE; STRONG QUAKE IN KURIL ISLANDS

 

EARTHQUAKE SUMMARY FOR OCTOBER 23, 2024

 

A strong X-class (about X2.0) occurred today starting at about 03:00 UT on October 24 and lasting for several hours. An estimate of the parameters from SWPC for this event follow:

 

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

XXXX       0300   0350      0730   X2.0      (October 24, 2024)   9.6E-02

 

This is the first X-class flare in the past two weeks - since an X1.3 on October, 29, 2024 (#7930) with the last of larger energy as an X7.1 on October 1, 2024 and an X9.0 on October 3, 2024. It occurred while the regions of Taiwan and the Philippines and Japan near 135 East longitude were at local solar noon. This is the area most likely to see enhanced seismicity related to this flare; secondarily, the area near the eastern U.S. and Canada, the Central Atlantic Ridge and the northern Caribbean were near local solar midnight at the time of this flare and could see related enhanced seismicity in the next several days. This flare is likely to reset global seismicity from the relatively quiet two previous weeks. In response to this, this summary will emphasize current seismicity for the foreseeable future. Final daily reports will be current and older unpublished reports will be produced as time permits. A major earthquake is likely at this time and is overdue since the last such event occurred more than two months ago in Tonga (M 6.9) on August 26, 2024.

 

The strongest earthquake in the world today was an M 6.2-6.3 in the Kuril Islands. The last earthquakes in the Kuril Islands of M>=6.2 were of M 6.5 on August 10, 2023 and M 6.5 on December 28, 2023. The last of significantly larger magnitude than today's earthquake was an  7.4 on March 24, 2020. An M 7.0 occurred nearer to today's earthquake on February 13, 2020. At the time

 

"Today's event of M 7.0 in the Kuril Islands is the strongest quake recorded in the Southern Kuril Islands in near seven years - since an M 7.2 on April 19, 2013 and prior to that an M 7.3 on November 17, 2002. After the M 7.7 in Cuba region of January 28, it is the strongest earthquake in the world during 2020." (February 13, 2020)

 

Today's event in the Kuril Islands occurred within minutes of local solar midnight and was likely promoted by tidal stresses which maximize near this hour.

 

Forecasts 167114 had expected today's event in the Kuril Islands was likely within about 50 km around October 27, 2024.

 

O: 23OCT2024 14:38:04  49.4N  155.6E MW=6.2  EMSC   KURIL ISLANDS                

P: 27OCT2024 167114    49.0N  155.0E 3.5-5.5 BAAAA  NE Pacific                 

 

A series of moderate earthquakes in the region of Northern California including events of M 4.4 M 4.2, 4.1, 4.1 and 4.0 and in the Fox Islands of M 5.0 occurred near local solar midnight. These events were probably promoted by SFE from this X-class flare. NEIC reported these earthquakes were felt with maximum intensity IV in northern California at Petrolia, Fortuna, Carlotta and II-III in Ferndale, Rio Dell, Scotia, Hydesville, Myers Flat, Redcrest, Whitethorn, Redway, Barberville, Loleta, Eureka, Kneeland, Samoa, Alderpint, Bayside, Arcata, McKinleyville, Trinidad, Mendocino, Benicia among others. EMSC reported moderate intensity for the larger of these events was felt in Fortuna, Ferndale, Loleta and Vallejo.

 

The last earthquake of M>=4.4 in this region of Northern California within about

100 km of this epicenter occurred on February 2, 2024 with M 4.8 and on October 16, 2023 (M 4.8). At the time this summary noted:

 

 

A moderate earthquake of M 4.8 was felt widely in northern California today as well. It was followed by an M 4.0 immediate aftershock and by later aftershocks of M 2.9 and 3.0. NEIC reported this event was felt with maximum intensity V in Carlotta and IV in California at Petrolia, Scotia, Redcrest, Myers Flat, Rio Dell, Ferndale, Redway, Hydesville, Garberville, Whitethorn, Fortuna, Kneeland, Bridgeville, Loleta, Eureka, Piercy, Korbel, Samoa, and as far as Sacramento and Mount Shasta. Aftershocks of M 2.9 and M 3.0 in Northern California were felt with intensity II-III in the area(s) of Northern California in Eureka, Bayside, Fortuna, Arcata, Carlotta, Whitethorn, McKinleyville, Ferndale (IV) and Rio Dell. Like the event in the Andreanof Islands (see above) it occurred near local solar midnight and was under the beginnings of the solar eclipse of October 14 where it was observed about 08:15 PST (16:15 UT) (see above). This is the strongest earthquake within about 100 km of this epicenter since an M 5.4 on January 1, 2023 and an M 6.4 on December 20, 2022. At the time of the January, 2023 event this summary noted:

 

"An M 5.4 aftershock of the M 6.4 in Northern California of December 20, 2022 was widely felt with additional damage today. NEIC reported maximum intensity VII in Rio Dell with VI in Scotia, Carlotta, Redcrest, Hydesville, V in Petrolia, Ferndale and Fortuna and IV in Myers Flat and Kneeland. It was reported felt as far as Nevada, Southern California, Washington and Oregon and

British Columbia with intensity up to IV. The quake occurred near local solar noon and may have been promoted by SFE and/or tidal stresses which maximize near this hour. The epicenter was further inland than the mainshock and this led to the earthquake being more strongly felt with more damage than the mainshock." (January 1, 2023, October 16, 2023)

 

Forecast 167121 had expected today's event within about 50 km was likely

around October 26, 2024.

 

O: 24OCT2024 05:56:01  40.2N  124.4W ML=3.6  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 24OCT2024 06:18:15  40.3N  124.3W Mw=4.0  EMSC   NORTHERN CALIFORNIA

O: 24OCT2024 06:18:15  40.3N  124.3W Mw=4.2  ANSS   NORTHERN CALIFORNIA

O: 24OCT2024 06:58:47  40.3N  124.3W Mw=4.2  EMSC   NORTHERN CALIFORNIA

O: 24OCT2024 06:58:47  40.3N  124.3W Mw=4.4  ANSS   NORTHERN CALIFORNIA

O: 24OCT2024 06:59:49  40.3N  124.3W MW=4.0  EMSC   NORTHERN CALIFORNIA          

P: 26OCT2024 167121    40.6N  124.9W 2.5-4.6 AAAAA  Off Coast of No. Calif     

 

An earthquake of M 5.3-5.7 was also recorded in the Mid-Indian Ridge today near the height of the X-class solar flare. It, and an M 5.0 foreshock were not reported felt in this remote area. It is likely to have been triggered by SFE associated with the X-class flare today as it occurred near local solar noon. The last earthquake within about 300 km of this epicenter in the Mid-Indian Ridge occurred 10 years ago on November 3, 2014 with M 5.7 and on May 31, 2008. At the time this summary noted:

 

 

"A strong earthquake of M 5.7-6.2 in the South Indian Ocean near the triple junction of the Indian Ridge system was followed by an M 5.3 regional aftershock today. This is a remote area and these earthquake were not reported felt. These epicenter lie near the antipode of the strong sequence of events which has rocked Oklahoma in recent years. Oklahoma was also very active today with about 8 earthquakes of M>=2.5 recorded in that State today. Even California and Nevada appeared to be emerging from their recent earthquake quiet. The strongest earthquake in that region today was an M 3.9 near Sparks, Nevada, but earthquakes of M 3.3 also hit east of Los Angeles and of M 3.7 near the northern Coast of California today.

 

The M 6.2 in the South Indian Ocean is the third event of M>=6 in the past three days in the world. This follows an 18-day quiet period in which the only such event in the world of M>=6 was a M 6.0 in Tonga. This active period appears to be related to solar/geomagnetic instability as noted previously in this summary. The last earthquake of M>=5.7 in this area within about 300 km of this epicenter on the Mid-Indian Ridge occurred as an M 6.4 on May 31, 2008 and an M 5.7 on October 6, 2006. A strong quake of M 6.4 hit about 400 km northwest of today's epicenter on October 4, 2013." (November 3, 2014)

 

The antipode of this event is in western Nebraska at 42N 100W, an area where light earthquakes occasionally occur and such an event is possible at this time.

 

Forecast 167215 had expected today's activity within about 500 km was likely

towards the end of October, 2024.

 

O: 24OCT2024 04:30:00  41.8S   79.8E mb=5.0  EMSC   MID-INDIAN RIDGE

O: 24OCT2024 04:30:50  41.9S   80.0E MB=5.3  EMSC   MID-INDIAN RIDGE             

O: 24OCT2024 04:30:51  42.0S   80.0E MB=5.7  ANSS   MID-INDIAN RIDGE             

P: 31OCT2024 167215    37.0S   79.0E 4.0-5.4 CCAAA  So. Indian Ocean           

 

Another series of events probably related to the X-class flare today  occurred in Maule, Chile. An M 4.2 hit with the start of the flare and was followed by an M 4.4 near the peak of the flare. This later event occurred within minutes of local solar midnight and was probably triggered by SFE with the flare combined with tidal stresses which maximize near this hour. The last event of significantly larger magnitude in Maule, Chile was an M 5.2 on May 13, 2024. An M 4.5 also hit the region north of this on September 8, 2024.

 

Forecast 167209 had expected today's activity was likely within Maule, Chile around October 25, 2024. 

 

O: 24OCT2024 02:20:24  36.3S   71.6W mb=4.2  EMSC   MAULE, CHILE

O: 24OCT2024 04:23:13  36.1S   70.7W MB=4.4  EMSC   MAULE, CHILE                 

P: 25OCT2024 167209    37.0S   73.0W 4.0-6.0 AABAA  Central Chile              

 

 

STRONG EARTHQUAKE IN MAURITIUS/REUNION

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 26, 2024

 

The strongest earthquake in the world today was an M 6.3 in the area of Reunion and Mauritius in the South Indian Ocean. It was not immediately reported felt in this area. This earthquake occurred within minutes of local solar midnight with

the beginning of an M-class solar flare and may have been promoted by geomagnetic and/or tidal stresses which maximize near this hour. An M 4.4 aftershock was reported by EMSC to have been felt in Guerrero at Benito Juarez, Alvaro Obregon, and Ciudad Lopez Mateos. This epicenter is nearly antipodal to the Hurricane John which made landfall in Guerrero, Mexico over the past two days. This was noted in the previous issue of this summary as:

 

"Hurricane John continued today  with winds up to 75 kts south of central Mexico. It is expected to track to the north after making landfall around September 25-26 near Punta Escondida and Acapulco, Mexico and is likely to make a second landfall in Michoacan in two days. Regional seismicity in Mexico is expected to be enhanced as this storm passes through the region." (September 25-26, 2024)

 

The last earthquake in the Mauritius-Reunion area within about 300 km of this epicenter was an M 6.7 on May 12, 2021 and July 26, 2012. Global stress conditions with the May 12, 2021 earthquake were similar to those today. At the time of the 2021 event this summary noted:

 

 

"The strongest earthquake in the world today was an M 6.7 in the Mauritius-Reunion area in the South Indian Ocean. NEIC reported it was as far as 1000 km from the epicenter in Mauritius at Laimatie Flaco, Bois des Amourettes, Grand Port, Curepipe Plaines Wilheim, Quatre Bornes Paines Wilheim and in Antananarivo, Madagascar and at Male, Maldives. The last earthquake in the world of larger magnitude was an M 7.0 on March 20, 2021 off the coast of eastern Honshu. A smaller event off Honshu of M 6.7-6.8 occurred more recently on May 1, 2021. The only earthquake ever recorded of M>=6.7 within about 300 km of this epicenter was an M 6.6 on July 26, 2012. Today's earthquake is at the exact antipode of the eye of Tropical Storm Andres which is south of western Mexico at this time. The possibility of such an event at this time had been suggested in this summary in the previous summary as:

 

"Tropical storm Andres continued in the area south of Jalisco, Mexico with winds up to 85 kts.  The M 5.1 in Michoacan today was probably promoted by stresses from this storm. The antipode of this storm is at 17S 67E in the South Indian Ridge. A moderate to strong earthquake in this area is possible at this time. This longitude is also near the maximum tidal stress with the current new moon

 

...

 

A third factor which probably enhanced global seismicity today was a strong geomagnetic storm which began about the time of M 6.7 in the Mauritius-Reunion area (about 14:00 UT). Most of the strong activity today occurred near the geomagnetic equator or at high latitude as expected with strong geomagnetic triggering. As described in this summary, this storm is the strongest recorded since September 1, 2019:

 

"The geomagnetic field saw stormy conditions today. The AP level was 41.  High latitude geomagnetic field also saw strong storm conditions with AP 47. Strong, sudden commencement storms such as this can enhance seismicity especially near the geomagnetic equator or near the polar auroral regions. This is the strongest geomagnetic storm since AP reached 45 on September 1, 2019 more than 1.5 years ago.." (May 12-13, 2021)

 

Forecast 116344 had expected today's event in Mauritius and Reunion was like within around 200 km in mid-September.

 

O: 26SEP2024 19:19:29  17.2S   66.6E MW=6.3  EMSC   MAURITIUS - REUNION REGION   

P: 17SEP2024 116344    15.0S   67.0E 4.0-5.4 CCAAA  So. Indian Ocean           

 

A moderate earthquake of M 5.0 hit the region of Guerrero, Mexico today. NEIC reported it was felt with intensity II-III in Chilpancingo, Guerrero, in the State of Mexico at Mexico City, Naucalpan, Capulhuac, Cuernavaca, Morelos, and in Michoacan at Puruandiro and Morelia. This epicenter is at the location of the landfall of Hurricane John (see above) and this earthquake was probably was triggered by stresses from this storm (see above). This earthquake occurred about 16 minutes prior to the M 6.3 near the antipode in the Mauritius region of the Indian Ocean.

 

The strongest earthquake in the U.S. or Canada today was an M 4.0-4.3 in the Vancouver/northern Washington area. NEIC reported intensity up to III in Washington at Edmonds, Seattle with lesser shaking in Washington at Woodinville, Bellevue; in Oregon at Happy Valley, Gold Beach and in Idaho at Coeur D'Alene and Garden City. EMSC reported strong shaking and a rumble in Canada at Saanich, Sidney, Oak Bay, Victoria, North Saanich, Brentwood Bay, Southern Gulf Islands, Piers Island, View Royal, Langford, Cowichan Valley, Metchosin, Salt Spring Island, Sooke, North Cowichan, Tsawwassen, Surrey, Delta, Richmond, Arbutus Ridge, Vancouver, Langley, Burnaby, West End, Coquitlam, Abbotsford, West Vancouver, North Vancouver, Mission, Chase,  and in Washington State at Friday Harbor, Stanwood, This is the strongest earthquake within about 150 of this epicenter since an M 4.9 at this epicenter on December 30, 2015. At the time this summary noted:

 

 

"The most widely felt earthquake of the day was the M 4.9 in the Vancouver Island region on the Puget Sound west of Seattle, Washington. While reported as far as New Mexico and Indiana perceptible shaking from this event was probably limited to an area about 200 km from the epicenter. NEIC reported intensity II-III in communities throughout British Columbia and northwestern Washington State. More intense shaking of intensity IV was reported in Washington at Friday Harbor, La Conner, Lopez Island, Lummi Island, Lynden, Point Roberts, Sumas, Forks, Sekiu, Olympia, Aberdeen, and in British Columbia at Sidney, Abbotsford, Aldergrove, Cowichan Valley, Cumberland, Duncan, Fort Langley, Lillooet, Lions Vay, North Cowichan, Sooke, Vancouver, Victoria, Walnut Grove and White Rock. No major damage or injuries were reported with this earthquake.

 

The Vancouver quake hit within an hour of local solar midnight and was probably promoted by high tidal stresses which maximize at this time. The last earthquake within about 150 km of this epicenter with M>=4.8 occurred on June 10, 2001 with M 5.0. This was probably an aftershock of the M 6.8 earthquake near Olympia of February 28, 2001." (December 30, 2015)

 

Forecast 116299 had expected this earthquake of M 4.3 was likely in this area around September 17.

 

O: 26SEP2024 11:05:19  48.6N  123.3W MB=3.8  ECAN OF VICTORIA, BC   

O: 26SEP2024 11:05:20  48.6N  123.2W MB=4.3  EMSC   VANCOUVER ISLAND, CANADA REGIO

P: 17SEP2024 116299    48.9N  123.1W 2.0-3.9 CAAAA  Washington state, U.S.      

 

An earthquake of M 4.2-4.3 also occurred in the region of Vancouver Island, British Columbia today. It was accompanied by a series of light foreshocks.

 

Forecast 166309 had expected these events were likely within about 100 km around September 25.

 

 

O: 26SEP2024 08:12:14  51.5N  130.7W ML=3.4  EMSC   HAIDA GWAII REGION

O: 26SEP2024 12:08:15  51.5N  130.9W MB=4.3  ECAN OF PORT HARDY, BC  

O: 26SEP2024 08:12:14  51.5N  130.7W MB=3.4  ECAN OF PORT HARDY, BC  

O: 26SEP2024 06:24:16  51.4N  130.9W MB=3.8  ECAN OF PORT HARDY, BC  

O: 26SEP2024 06:19:54  51.5N  130.8W MB=3.3  ECAN OF PORT HARDY, BC  

O: 25SEP2024 23:48:29  51.5N  130.9W MB=3.7  ECAN OF PORT HARDY, BC  

O: 26SEP2024 12:08:15  51.5N  130.9W ML=4.2  EMSC   HAIDA GWAII REGION           

P: 25SEP2024 166309    50.3N  130.2W 3.0-5.0 ABAAA  British Colombia           

 

 

 

MODERATELY STRONG QUAKE IN HOKKAIDO, JAPAN TRIGGERED BY TYPHOON PULASAN

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 25, 2024

 

 

The strongest earthquake of the day was an M 5.5 in Hokkaido, Japan. NEIC reported it was felt with intensity II-III in Hokkaido at Otofuke and Tomakomai. This earthquake may have been promoted by stresses associated with Typhoon Pulasan which passed south of this epicenter in the past two days as noted in

previous issues of this summary:

 

"TS Pulasan continued today with winds up to 45 kts West of Honshu Japan. It is expected to track to the east over the next two days and to make landfall  ... on September 22-23 in western Honshu, Japan. Seismicity in southern Japan is expected to be enhanced as this storm passes through the area." (September 22-24, 2024)

 

The last earthquake in Hokkaido of M>=5.5 occurred on November 19, 2023 with M 5.8. At the time this summary noted:

 

 

The strongest earthquake in the world today was an M 5.8 in Hokkaido, Japan. NEIC reported it was felt with intensity up to IV in Yokohama, Japan. This epicenter is at the ninth node (40 degrees) from the M 6.9 in Mindanao of November 17 and was probably promoted by energy from that source. An earthquake of M 5.8 also occurred near this epicenter on August 11, 2023. At the time this summary noted:

 

"The strongest earthquake in the world today was an M 5.8 in Hokkaido, Japan. NEIC reported it was felt with intensity III in Hokkaido at Sapporo, Hakodate and in Aomori in Hachinohe and Misawa. The last earthquake recorded in the region of Hokkaido, Japan with M>=5.8 was an M 6.2 on June 11, 2023. At the time this summary noted:

 

"Today's M 6.2 in Hokkaido is the strongest recorded in southern Hokkaido within about 200 km of this epicenter since an M 6.2 on December 19, 2021 and prior to that an M 6.6 near today's epicenter on September 5, 2018." (June 11, August 11, 2023, November 19, 2023)

 

Forecast 166269 had expected today's event in Hokkaido was likely within about 25 km of this epicenter around September 22.

 

O: 26SEP2024 07:01:10  42.8N  145.0E MW=5.5  EMSC   HOKKAIDO, JAPAN REGION       

P: 22SEP2024 166269    43.0N  145.0E 3.5-5.5 BAAAA  Hokkaido, Japan            

 

The most unusual earthquake of the day was an M 5.3 in the South Atlantic Ocean area. It was not reported felt in this remote area. This is the strongest earthquake in the Southern Mid-Atlantic area within about 250 km of this epicenter since an M 6.6 on April 3, 2021 (an M 5.2-5.3 also hit on August 9, 2021 – probably an aftershock). At the time of the April, 2021 event this summary noted:

 

 

"The largest earthquake in the world today was an M 6.6 in the South Atlantic east of the South Sandwich Islands. This is the strongest quake within about 500 km of this epicenter since an M 6.6 on May 23, 1995, the only such event in at least the past 30 years. It was preceded by an M 5.1 yesterday in the South Sandwich Islands." (April 3, 2021)

 

O: 25SEP2024 14:01:05  57.7S    6.9W MB=5.3  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

 

An M 2.1 also was lightly felt in the region of Illinois today. The last earthquake located in Illinois of M>=2.1 was an M 2.4 near Enfield, Illinois about 100 km southeast of today's epicenter. Forecast 166221 had expected today's activity within about 100 km was likely around September 27.

 

 

O: 26SEP2024 02:50:33  38.8N   89.2W ML=2.1  EMSC   ILLINOIS                     

P: 27SEP2024 166221    38.0N   89.0W 2.0-4.1 AAAAA  New Madrid area            

 

 

HURRICANE HELENE TRIGGERS MODERATE EARTHQUAKE IN EASTERN MEXICO

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 24, 2024

 

 

The strongest earthquake in the world today was an M 5.3 in eastern Mexico. NEIC reported this earthquake of M 5.3 in Eastern Mexico was felt with intensity up to VII in the area(s) of Eastern Mexico in Puerto Madero, Chiapas. EMSC reported moderate shaking in Mexico at Tapachula de Cordova and Ordonez. It is likely that this event was triggered by landfall of Hurricane John to the west and the formation of Tropical Storm Helene to the north of this epicenter today. This had been anticipated in this summary in the previous issue as:

 

"Hurricane John continued today  with winds up to 105 kts south of central Mexico. It is expected to track to the north making landfall around September 24-25 near Punta Escondida and Acapulco, Mexico. Regional seismicity in Mexico is expected to be enhanced as this storm passes through the region." (September 24, 2024)

 

and

 

"Tropical Storm Helene formed today in the area of the Yucatan, Mexico as a Hurricane with winds up to 65 kts. It is expected to track to the north rapidly increasing in intensity to a category 3 storm over the Gulf of Mexico before making landfall on the Panhandle of Florida on September 26-27. It will then dissipate over Tennesse and Kentucky. This storm could enhance seismicity in eastern Mexico in Veracruz and Chiapas and enhance seismicity in southeastern U.S. as it tracks through the area.

 

The M 5.3 today occurred within minutes of local solar midnight and may have also been promoted by strong tidal stresses which maximize near this hour. The last earthquake of M>=5.3 in Chiapas was an M 5.4 on August 5, 2024.

 

Forecast 166154 had expected today's event within about 100 km was likely around September 27.

 

O: 24SEP2024 07:27:39  14.0N   92.5W ML=4.1  EMSC   OFFSHORE GUATEMALA

O: 25SEP2024 02:11:34  14.2N   93.3W mb=4.5  EMSC   OFF COAST OF CHIAPAS, MEXICO

O: 25SEP2024 06:43:21  14.4N   93.2W MW=5.3  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 27SEP2024 166154    14.0N   92.0W 3.5-5.2 AAAAA  Guatemala                  

 

 

STRONG QUAKE IN SULAWESI, INDONESIA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 23, 2024

 

 

The strongest earthquake in the world today was an M 6.0 in Sulawesi, Indonesia. NEIC reported it was felt with intensity IV in Sulawesi at Luwuk. BMG reported this earthquake with M 6.4 at 0.1S 122.9E was felt in the Gorontalo area of Sulawesi among others. The last earthquakes of M>=6 in Sulawesi within about 200 km of today's epicenter occurred on January 18, 2023 with M 6.0 and prior to that an M 6.2 on July 26, 2021. On January 18, 2023 this summary noted in this regard:

 

 

"The largest earthquake in the world today was an M 6.3 in the Molucca Sea south

of the Talaud Islands, Indonesia. It was reported felt lightly in the epicentral

area. The last earthquake of larger magnitude within about 200 km of this epicenter in the Molucca Sea was an M 7.1 on November 14, 2019." (July 10, 2021)

 

Forecast 166142 had expected today's event within about 100 was likely around

September 26.

 

 

O: 23SEP2024 19:51:03   0.1S  122.8E MW=6.0  EMSC   SULAWESI, INDONESIA          

P: 26SEP2024 166142     1.0S  122.0E 4.0-5.4 BAAAA  Sulawesi area              

 

A moderately strong earthquake of M 5.6-5.7 also occurred today in the region of the Izu Islands, Japan. A tsunami alert was issued but was quickly withdrawn as not waves were observed. This earthquake as Tropical Storm Pulasan passed near this epicenter near Torishima Island. Strong floods in the wake of Pulasan have been occurring causing thousands to be evacuated. Parameters for this storm were at the time in the previous issue of this summary:

 

"TROPICAL STORM PULASAN (15W)

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TS    PULASAN  2024-09-23  00:00 UT  34.0N  138.9E   45 kts  West of Honshu, Japan    

 

TS Pulasan continued today with winds up to 45 kts West of Honshu Japan. It is expected to track to the east over the next two days and to make landfall  ... on September 22-23 in western Honshu, Japan. Seismicity in southern Japan is expected to be enhanced as this storm passes through the area." (September 22-23, 2024)

 

Today's earthquake in the Izu Islands is the strongest in that region since an M 6.1 on October 6, 2023. At the time this summary noted:

 

 

"The largest earthquake in the world today was an M 6.1 in the Izu Islands, Japan. It was reported by NEIC to have been felt with light intensity in Saitama, Japan. It was accompanied by moderately large quakes of M 5.8, 4.2, 5.5, 5.6 and 5.6. This follows a long run-up to this swarm over the past week. This was noted in the previous issue of this summary as:

 

"Moderate earthquakes also continued today in the Bonin and Izu Islands of Japan today. The largest of these today were M 5.0-5.1. These events had been noted in previous issues of this summary as:

 

"The earthquake of M 5.7 in the Izu Islands, Japan was followed by an M 4.7 three hours later. It follows a series of such events in the area including an M 5.8 on September 19. At the time this summary noted:

 

 

"An M 5.8 also occurred in the Izu Islands south of southeastern Honshu, Japan today. A similar M 5.8 occurred on February 5, 2023 and an M 6.3 in the Izu Islands was recorded on January 16, 2023...." (October 4, 2023)

 

Forecast 166228 had expected enhanced seismicity in the Izu Islands within about

200 km of this epicenter was likely around September 22.

 

 

O: 23SEP2024 23:14:22  31.6N  140.0E MW=5.6  EMSC   IZU ISLANDS, JAPAN REGION    

P: 22SEP2024 166228    30.0N  142.0E 4.0-5.4 ABBAA  Off East Coast Honshu      

 

 

MODERATE QUAKES IN COQUIMBO, CHILE; WEST CHILE RISE; MAURITIUS

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 22, 2024

 

 

The strongest earthquake felt in the world today was an M 5.4-5.5 in Coquimbo, Chile. NEIC reported maximum intensity V in Coquimbo with IV in La Serena and III in Illapel, Coquimbo with IV in Vallenar, Atacama and lesser shaking in Illapel, Coquimbo, Copiapo, Atacama, Qujilpue, Valparaiso and Santiago, Chile.

EMSC reported it with strong shaking in Coquimbo, La Serena, Paiguano, Ovalle, Quilpue, Cerro Navia, Chile. GUC reported the M 5.5 was felt with intensity  VII in  Atacama at Copiapo, Tierra Amarilla, Huasco, Vallenar, IV in Alto del Carmen, Freirina, III in Chanaral, Diego de Almagro, Caldera; in Coquimbo with VII in La Serena, VI in Coquimbo, La Higuera, Tongoy, Vicuna, V in Monte Patria, Ovalle, Rio Hurtado, Canela, IV in Illapel, Andacollo, Paiguano, Combarbala, Punitaqui, Salamanca, and III in Los Vilos, Chile. The last earthquake of M>=5.4 in Coquimbo within about 200 km of the M 5.4 today was recorded on February 14 and February 11, 2024 with M 5.4 and M 5.8.

 

An earlier, regional foreshock of M 5.0 was also felt in Valparaiso, Chile today. NEIC reported intensity up to IV in Valparaiso at Quillota, Vina del Mar, Valparaiso and II-III in Calera, Quilpue, Villa Alemana, San Felipe and in Santiago and Teno, Maule. EMSC reported strong shaking with this event in Chile at Los Vilos, Papudo, Cabildo, Salamanca, Puchuncavi, Putaendo, Concon, San Felipe, Vina del Mar, Llaillay, Limache, Olmue, Villa Alemana, Valparaiso, Quilpue, Casablanca, Cartagena, Independencia, Providencia, Santiago, Las Condes, Maipu, Nunoa, Macul, Calera de Tango, Chile. GUC reported the M 5.0 was felt with intensity  V in  Coquimbo at Canela, Los Vilos; IV in Illapel, Salamanca, Monte Patria, Ovalle, Punitaqui, Rio Hurtado, III in Andacollo, La Serena dn II in Combarbala and in Valparaiso with V in Quintero, and La Ligua and IV in Quillota, Valparaiso, Limache, Quilpue and III in San Antonio, San Felipe; with III in Santiago at Quilicura, El Monte, Macul; in O'Higgins at Rancagua, Mostazal and Machali.

 

Forecasts 166359 and 166361 had expected today's activity in Coquimbo was likely within about 100 km around September 24.

 

O: 23SEP2024 02:36:39  29.7S   71.2W MW=5.4  EMSC   COQUIMBO, CHILE              

O: 23SEP2024 02:36:39  29.7S   71.2W MW=5.5  GUC    COQUIMBO, CHILE              

P: 24SEP2024 166350    29.0S   72.0W 4.0-5.5 AAAAA  Coast Central Chile        

 

O: 22SEP2024 18:46:38  32.0S   71.4W MB=5.0  EMSC   COQUIMBO, CHILE              

O: 22SEP2024 18:46:38  32.0S   71.4W MB=5.0  GUC    COQUIMBO, CHILE              

P: 24SEP2024 166361    31.0S   71.0W 4.0-5.4 AAAAA  Central Chile              

 

 

An M 5.4 also was recorded near Mauritius and Reunion Islnds in the Indian Ocean today. It was not reported felt in this region. This earthquake occurred while a strong M- to X-class solar flare was beginning and was antisolar (local solar midnight) at the time of the quake and flare. Solar Flare Triggering is likely in this case. Following is the SWPC data for this flare.

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

2840       2112   2139      2205   M3.7      (September 22, 2024)   7.1E-02  

 

O: 22SEP2024 20:42:37  17.3S   66.5E MW=5.4  EMSC   MAURITIUS - REUNION REGION   

 

The last earthquake of M>=5.4 within about 200 km of this epicenter in Mauritius

occurred with M 6.7 on May 12, 2021. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 6.7 in the Mauritius-Reunion area in the South Indian Ocean. NEIC reported it was as far as 1000 km from the epicenter in Mauritius at Laimatie Flaco, Bois des Amourettes, Grand Port, Curepipe Plaines Wilheim, Quatre Bornes Paines Wilheim and in Antananarivo, Madagascar and at Male, Maldives. The last earthquake in the world of larger magnitude was an M 7.0 on March 20, 2021 off the coast of eastern Honshu. A smaller event off Honshu of M 6.7-6.8 occurred more recently on May 1, 2021. The only earthquake ever recorded of M>=6.7 within about 300 km of this epicenter was an M 6.6 on July 26, 2012. Today's earthquake is at the exact antipode of the eye of Tropical Storm Andres which is south of western Mexico at this time." (May 12, 2021)

 

An earthquake of M 5.4 also occurred on the West Chile Rise today. It was not reported felt in this remote area. The last earthquake of M>=5.4 in the West Chile Rise within about 200 km of today's epicenter was an M 5.6 on June 24, 2022.

 

Forecast 166370 had expected today's event within about 50 km was likely

around September 27.

 

O: 22SEP2024 08:43:08  41.4S   88.0W MW=5.4  EMSC   WEST CHILE RISE              

P: 27SEP2024 166370    41.0S   88.0W 4.0-5.6 BAAAA  Chile Rise                 

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in Hawaii with the continuing eruption of Kilauea in that area. NEIC reported this event was felt with intensity II-III in Hawaii at Pahala, Naalehu, Captain Cook, Volcano, Holualoa, Pahoa, Hilo, Mountain View, Kealakekua, Kurtistown, Paauilo, Papaikou, Kailua Cona, Hakalau, Nonole (IV), Honomu, Papaaloa, Kamuela, Laupahoehoe, Waikoloa, Honokaa, Kapaau and Hawi. The last earthquake in Hawaii of M>=4 occurred on September 15, 2024 (M 4.3) and August 22, 2024 (M 4.7). On average 1-2 events of M>=4 hit Hawaii each month. The last significant earthquake of M>=5 in Hawaii was an M 5.7 on February 9, 2024. At that time this summary noted: 

 

"The strongest earthquake in the U.S. or the world today was an M 5.7 in the Mauna Loa region of Hawaii (initially given as M 6.3). NEIC reported it was felt as far as Honolulu and throughout the island of Hawaii with intensity up to VII. Foreshocks of M 2.9 and 3.0 were also reported felt in Pahala, Hawaii with intensity up to IV.  EMSC reported strong to violent shaking in Hawaii at

Naalehu, Mountain View (with loud earthquake nose) Kealakekua, Fern Acres, Keaau, Pahoa, Hilo, Kailua Kona, Pepeekeo, Honokaa, Wailea, Wailuku, Maui, Lahaina, Honolulu, Kailua, Kaneohe, Minor damage which included items being thrown from shelves and minor damage to structures was reported which included cracked walls. This is the strongest earthquake in Hawaii since an M 6.2 on October 10, 2021 and an M 6.9 on May 4, 2018 - the largest in Hawaii in the past 35 years. The only other event in Hawaii with M>=6.2 in this time period was an M 6.7 on October 15, 2006." (February 9, 2024)  At the time of the October, 2021 event this summary noted:

 

Forecast 166155 had expected enhanced seismicity in Hawaii was likely around

September 24.

 

O: 22SEP2024 16:21:24  19.2N  155.5W ML=4.0  EMSC   ISLAND OF HAWAII, HAWAII     

P: 24SEP2024 166155    19.9N  156.1W 3.0-4.4 AAAAA  Hawaii                     

 

 

TYPHOON PULASAN TRIGGERS ANTIPODAL M 6.0 IN ARGENTINA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 21, 2024

 

 

The strongest earthquake in the world today was an M 6.0 in northern Argentina. NEIC reported it was felt with intensity IV in Alta Garcia, Cordoba and in La Rioja, Argentina with intensity II-III reported in Argentina at San Juan, San Martin and Mendoza, Cordoba and in Chile in Santiago, Vina del Mar, Valparaiso, La Serena, Coquimbo. EMSC reported strong shaking in Argentina at Las Heras, Mendoza, Chilecito, and in Chile at Vitacura, and Puchuncabi. This epicenter lies near the antipode of Eastern China where a Tropical Storms (17W and Pulasan) made landfall about the same time today.

 

"TS Pulasan continued today with winds up to 40 kts over Eastern China. It is expected to track to the northwest over the next two days and to make landfall  ... on September 19-20. Seismicity in southern Japan is expected to be enhanced as this storm passes through the area." (September 21, 2024)

 

and

 

"TS 17W continued today with winds up to 50 kts near the coast of China. It is expected to track to the west making landfall around September 21 near Singapore, the second such event in this area in the past two weeks (Typhoon Yagi) did so on September 6 and helped trigger an M 5.7 at the antipode in Bolivia and Argentina. The same could occur with today's landfall. A series of earthquakes also followed the landfall or Yagi in eastern China and these could recur in the next several days." (September 20, 2024)

 

Today's antipodal activity in South America with a strong ocean storm hitting

China mirrors activity earlier this month as related in this summary at the time:

 

"The strongest earthquake in the world today was an M 5.7 in Bolivia. NEIC reported it was felt with intensity up to III in Bolivia at Challapata and in Iquique, Tarapaca, Chile. EMSC reported light motion in Alto Hospicio, Chile.

This epicenter in Bolivia is at the exact antipode of the landfall of Typhoon  Yagi on the coast of Vietnam and China today (see WEATHER section below). Compare for antipodality landfall of Yagi at 19N 113E with this earthquake in Bolivia of M 5.7 at 19S 67W. The two events occurred simultaneously and a clear triggering effect is observable in this case." (September 6, 2024)

 

Today's earthquake in San Luis, Argentina is the strongest recorded within  about 200 km of this epicenter since an M 6.3 on February 2, 2015. The only other such event in the past 35 years of M>=6.0 in this region was an M 6.2 on September 17, 2006. At the time of the event of M 6.3 on February 2, 2015 this summary noted:

 

 

"The strong earthquake of M 6.3-6.4 off the coast of Chile and Argentina was felt in Argentina with intensity IV in San Juan and II-III in Pergamino, Cordoba, La Rioja, Mendoza, San Rafael, and San Luis. It was felt in Chile with intensity II-III in Copiapo, Coquimbo, Vicuna, Graneros, Machala, Rancagua,

Valdivia, Lampa, Melipilla, Puente Alto, San Bernardo, Santiago, La Ligua, Quilpue, Valparaiso and Vina del Mar in the regions of Valparaiso, Metropolitana, Los Lagos, O'Higgins, Coquimbo, and Atacama, Chile. This is the strongest earthquake within 200 km of this epicenter in at least 25 years. The last and only event in the past 25 years in this area of M>=6 occurred on September 17, 2006 with M 6.2." (February 2, 2015)

 

Forecast 166361 had expected this event in this region was likely around September 22.

 

O: 21SEP2024 21:24:28  31.9S   66.9W MW=6.0  EMSC   SAN LUIS, ARGENTINA          

P: 22SEP2024 166361    31.0S   69.0W 4.0-5.6 AABAA  Central Chile              

 

The strongest earthquake in the U.S. or Canada today was an M 5.4 in the western Andreanof Islands, Aleutians, Alaska. NEIC reported it was felt with intensity III in Adak, Alaska. This is the strongest earthquake in the Andreanof Islands since an M 6.1 on December 21, 2023 and the strongest in the western Andreanof Islands since an M 6.4-6.7 on October 16, 2023. At the time this summary noted:

 

 

"The strongest earthquake in the world today (including the U.S. or Canada) was an M 6.4-6.7 in the Central Andreanof Islands, Aleutians, Alaska. NEIC reported two events of M 6.4 and 6.7 at this time which were felt with intensity V in Adak and II-III in Atka and possibly as far as Anchorage and Wasilla, Alaska.

This event occurred within minutes of local solar midnight and was probably promoted by the new moon and solar eclipse of October 14 which began near this epicenter as noted in this and previous issues of this report:

 

...

 

The last earthquake in the Andreanof Islands of M>=6.7 was an M 7.0 on August 30, 2013. An earthquake of M 6.4 last occurred in the area on August 15, 2018 and September 4, 2013. At the time of the M 6.4 on August 15, 2018 this summary noted:

 

"The M 6.6 in the Andreanof Islands is the strongest in the U.S. since the M 6.9 in Hawaii of May 4, 2018 and the strongest in Alaska since the M 7.9 in the Gulf of Alaska of January 23, 2018. Earthquakes of M>=6.6 have hit the region of the western Andreanof Islands on three occasions since 1990 - an M 6.6 on May 2, 2008; an M 6.9 on March 20, 1999 and events of M 7.9 and 7.3 on June 10, 1996." (August 15, 2018, October 16, 2023)

 

Forecast 166306 had expected today's event about 50 km to th west was likely

around September 22.

 

O: 21SEP2024 17:21:20  51.3N  178.5W MW=5.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 22SEP2024 166306    51.7N  179.7W 3.5-4.9 AAAAA  Andreanoff Isls, Aleutians 

 

A series of light earthquakes in South Island New Zealand of M 3.0-3.5 occurred today. These began with an M 3.5 near local solar midnight and conclude with a pair of M 3.0 quakes near local solar noon. They coincided with a C1.6 class solar flare and the events near local solar midnight continued throughout the flare output. It is likely they were promoted by the SFE from this event as well as tidal stresses which maximize near this hour.

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

2600       1335   1341      1346   C1.6      (September 21, 2024)   9.4E-04  

South Island, New Zealand M 3.5, 3.5, 3.3 13:35-14:02 UT

 

O: 21SEP2024 23:41:10  43.9S  169.2E ML=3.0  EMSC   SOUTH ISLAND OF NEW ZEALAND

O: 21SEP2024 23:42:34  43.9S  169.2E ML=3.0  EMSC   SOUTH ISLAND OF NEW ZEALAND

O: 21SEP2024 13:35:30  45.3S  167.4E ML=3.5  EMSC   SOUTH ISLAND OF NEW ZEALAND

O: 21SEP2024 14:02:53  46.2S  165.9E ML=3.2  EMSC   OFF W. COAST OF S. ISLAND, N.Z.

O: 21SEP2024 13:50:55  46.3S  166.7E ML=3.3  EMSC   OFF W. COAST OF S. ISLAND, N.Z.

O: 21SEP2024 13:43:03  46.4S  166.0E ML=3.5  EMSC   OFF W. COAST OF S. ISLAND, N.Z

 

 

MODERATE QUAKE IN NORTHERN KERMADEC ISLANDS, NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 20, 2024

 

It was a relatively quiet day in global seismicity today. The strongest earthquake of the day was an M 5.6 in the northern Kermadec Islands of New Zealand. A similar M 5.7 hit about 200 km north of this Kermadec Islands epicenter on September 18, 2024. At the time this summary noted:

 

"The largest earthquake of the day was an M 5.7 in the northern Kermadec Islands, New Zealand. It was not reported felt in this remote area. This event was not reported felt in this remote area. The last earthquake of M>=5.7 in the northern Kermadec Islands within about 200 km of today's epicenter was an M 6.2 on May 31, 2024 and an M 5.8 on March 20, 2022 – both about 150 km south of today's epicenter. At the time of the May, 2024 event this summary noted:

 

"A moderate M 5.2 occurred towards the end of this flare in the Kermadec Islands within minutes of local solar noon and may have been triggered by SFE associated with this flare. Two moderate aftershock of the M 6.2 mainshock in the Kermadec

Islands occurred within minutes of local solar noon and were probably promoted by energy associated with the full moon which maximize near this hour.

 

This is the strongest earthquake in the Kermadec Islands within about 200 km of this epicenter since an M 7.1 more than a year ago on April 24, 2023 about 150 km southwest of today's epicenter. At the time this summary noted:

 

 

"A major M 7.1-7.2 earthquake occurred at the height of this geomagnetic storm in the area of the Kermadec Islands, New Zealand. A tsunami of small height was possible with this earthquake but only locally. It was not reported felt

in this remote area. An M 6.9 in the Kermadec Islands of March 4, 2023 followed a major geomagnetic storm of February 27-28, 2023." (April 24, 2023, May 31, 2024))

 

Today's event of M 5.7 also occurred within minutes of local solar noon and was probably promoted by strong tidal stresses with today's full moon.." (September 18, 2024)

 

Forecasts 166368 and 166353 had expected today's event within about 50 km was likely in late September.

 

O: 21SEP2024 02:32:17  29.0S  176.6W MW=5.6  EMSC   KERMADEC ISLANDS REGION      

P: 21SEP2024 166368    31.0S  177.0W 4.0-5.7 ABAAA  So. Kermadec Islands        

P: 27SEP2024 166353    29.0S  176.0W 4.0-5.4 CAAAA  No. Kermadec Islands       

 

O: 20SEP2024 21:05:35  32.9S  177.2W MB=4.5  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 21SEP2024 166368    31.0S  177.0W 4.0-5.7 ABAAA  So. Kermadec Islands       

P: 23SEP2024 166369    32.0S  179.0W 4.0-5.4 ABABA  So. Kermadec Islands       

 

 

 

MODERATE QUAKE IN NEW GUINEA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 19, 2024

 

 

It was a relatively quiet day in global seismicity today. The strongest earthquake in the world today was an M 5.6 in eastern New Guinea. NEIC reported it was felt with intensity II-III in the Highlands of Papua New Guinea at Kainantu and Mount Hagen. The last earthquake within about 200 km of today's event of M 5.6 of equal or larger magnitude was an M 6.3 on September 11, 2024 and this may be a regional aftershock of that event. A closer earthquake of M 5.7 hit near today's epicenter on May 21, 2024. At the time this summary noted:

 

"The strongest earthquake in the world today was an M 5.7 in Papua New Guinea. NEIC reported it was felt with intensity up to IV in Lae, PNG. It occurred near local solar noon and may have been promoted by strong tidal stresses associated with the full moon of May 23 which maximizes over this epicenter

 

...

 

This event joins other moderately large earthquakes along the geomagnetic equator in Papua New Guinea and New Ireland/Britain which have occurred daily since the major geomagnetic storm of mid-May, the strongest such ionospheric storm since October, 2003. Effects of such geomagnetic storms are greatest along the geomagnetic equator.

 

This is the strongest earthquake within about 200 km of today's epicenter

since an M 5.9 on November 14, 2023. The last of M>=6 was an M 6.7 and M 6.9 on October 7, 2023. At the time this summary noted:

 

"The earthquakes in New Guinea coincided with a moderate solar flare (#5480) and may have been promoted by SFE associated with that flare.

 

...

 

An M 7.0 occurred about 350 km north of today's epicenter on April 2, 2023. At the time this summary noted:

 

"The last earthquake of M>=6 in this area of Papua was an M 6.0 on January 18, 2020. but no earthquake larger size than this have been recorded in this area since an M 6.7 on January 10, 2002. ...  This epicenter is at 103 degrees from the mainshocks in Turkey and was probably promoted by energy from those sources." (February 9, 2023, April 2, 2023, October 7, 2023, May 21, 2024)

 

 

Forecast 166134 had expected today's event within about 50 km was likely around

September 22, 2024.

 

O: 19SEP2024 08:40:59   5.5S  147.5E MW=5.6  EMSC   EASTERN NEW GUINEA REG., P.N.G

P: 22SEP2024 166134     5.0S  147.0E 4.0-5.5 AAAAA  New Ireland                

 

An earthquake of M 2.6 in Missouri was widely felt with intensity up to IV within about 50 km of the epicenter. This earthquake was reported by NEIC to have been felt with intensity IV in Missouri at O'Fallon and II-III in Old Monroe, Winfield, Moscow Mills, Lake Saint Louis, Wentzville, Foristell, Troy, Saint Louis, Sainte Charles, Defiance, Grafton, Chesterfield, Ballwin and in Brighton, Illinois among others. This is the strongest earthquake within about 100 km of this epicenter since an M 2.9 on April 29, 2022 and an M 2.6 on September 5, 2015. At the time of the event in 2022 this summary noted:

 

 

"A light earthquake of M 2.8 was widely felt in the area of St. Louis, Missouri today. NEIC reported it was felt with intensity II-III in Valley Park, Ballwin, Fenton, High Ridge, Saint Louis, Eureka, It was also reported lightly felt in Illinois, Iowa, Tennessee, Indiana, Kansas and possible as far as Arkansas, Nebraska, Minnesota, Wisconsin, Michigan, Georgia, Texas, Ohio, Alabama, and Florida. This earthquake is the strongest within about 100 km of this epicenter since an M 3.9 on April 29, 2011 and an M 2.8 on May 5, 2008. ... One of the strongest earthquakes in this area in recent history occurred with an M 5.0 on April 30, 1899, 123 years ago (see history section of this summary)." (April 30, 2022)

 

 

Forecast 166221 had expected this event within about 150 km was likely in late

September.

 

O: 19SEP2024 08:30:21  38.9N   90.7W ML=2.6  EMSC   MISSOURI                     

P: 27SEP2024 166221    38.0N   89.0W 2.0-4.1 CABAA  New Madrid area            

 

 

UNUSUAL QUAKE IN EASTERN CHINA TRIGGERED BY TYPHOON PULASAN

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 18, 2024

 

 

An unusual earthquake occurred today in eastern China with M 4.9. NEIC reported it was felt with intensity up to V in Anhui, China at Wuhu; IV in Chuzhou, Hefei, Maanshan, Tunxi, in Changsha, Hunan and in Jiangsu, China at Changsha, Dingshu, Nanjing, Xiaolingwei and Xuzhou. EMSC reported moderate shaking in China at Hefei City, Nanjing, Hangzhou City,and Shaoxing, China with an earthquake noise. This is the strongest earthquake in eastern China within about 250 km of today's epicenter since an M 4.9 on January 19, 2011. Earthquakes of M 4.9 also occurred about 300 km northeast of this on July 20, 2012  with M 4.9 and about 300 km southwest with M 5.2 on November 26, 2005. At the time of the M 4.9 on July 20, 2012 this summary noted:

 

 

"An earthquake in southeastern China of M 4.8 was followed by more than 50 aftershocks according to Shanghai Daily.  Most were of M 3-4 and were lightly felt in the Yangzhou area. A major quake was not expected. The mainshock left one person dead and another four were slightly injured according to Xinhua. The quake also caused cracks to several residential buildings and toppled a few smokestacks in Zhouxiang township according to local authorities. It was also felt strongly in Zhenjiang and Ninjing, the capital city of Jiangsu.

 

NEIC reported this earthquake of M 4.9 in Jiangsu, China was felt with intensity II-III in the area(s) of Jiangsu at Changzhou, Huaiyin, Nanjing, Yancheng, Yangzhou, Zhenjiang, and in Anhui at Hefei and Chuzhou, China.

 

The only similar event in this area of China in the past 22 years was an M 5.1 about 300 km to the northwest of this epicenter on September 20, 1995." (July 21, 2012)

 

and on January 19, 2011:

 

"An unusual earthquake in Anhui, eastern China followed the Pakistan event today with M 4.9. NEIC reported this event was felt with intensity IV in Anhui at Chizhou and Hefei and II in Jiangsu at Nanjing, China. This epicenter is within 300 km of the exact antipode of the M 7.1 in Argentina of early January. This could have been affected by both the Pakistan and the Argentina earthquakes." (January 19, 2011)

 

Further information on the seismicity of eastern China in this area was provided in this summary on November 26, 2005 as:

 

"A moderate sized earthquake of M 5.5-5.6 was felt widely in east-central China today. Data on the NEIC website indicates that this event was felt with maximum intensity VII at Jiujiang, China and with lesser intensity at Changsha, Chizhou, Hangzhou, Meizhou, Nanchang, Wuan, Wuhan, Yiyang and Zhuzhou, China. It was felt with intensity IV at Wuan as far as 800 km from the epicenter. The Xinhua News Agency of China reported that at least 14  were killed and more than 400 injured in this quake. The epicenter was n Ruichang a city of more than 400,000 in Jiangxi province. About 130,000 buildings were reported damaged or collapsed in the quake and evacuation of 420,000 people were being evacuated in the wake of two moderate aftershocks.  CRI (China News Source) reported that of the injured 78 were injured in the course of the evacuation. Many were spending the night outdoors for fear of damage from aftershocks and tents have been provided. The Chinese Seismological Bureau gave the quake M 5.7 while other teleseismic networks gave magnitudes M 5.5-5.8. This is the strongest event located in this region of  eastern China (25-35N 110-120E) since events of M 5.5 on July 9, 1979 and a similar event on April 22, 1974. These earthquakes occurred about 400 km to the northeast of today's earthquake. This is about as large as the largest earthquake ever located within 200-300 km of this epicenter. Earthquakes in the region have been reported in 1425 (M 5.8); 1556 (M 5.6); 1584 (M 5.5) and 1962 (M 5.5). Smaller quakes hit in 1987 and 1949 in the Jiangxi area. The area is a popular tourist area. The quake killed six in Jiujiang county and injured 47 there. Other casualties occurred at Ruichang City (5 killed, 40 injured) and Wuxue (1 killed). The area has been placed under seismic watch on Nov. 19 effective through Nov. 26. Forecast 25890 expected activity southeast of this around Nov. 25 (but see also forecast 25886 which expected activity earlier in the month of November). The occurrence of this earthquake at this time may be related to landfall of Typhoon Bolaven which his southeastern China on Nov. 22-23 and has moved north and west while dissipating since that time in  Central China. Stresses induced by hurricanes and typhoons may help to trigger regional seismicity." (November 26, 2005)

 

 

TS Pulasan made landfall to the east of today's earthquake in China about the same time this earthquake occurred. It is likely that landfall of Tropical Storm Pulasan in Southern China was effective in promoted today's earthquake in China as noted in the previous issue of this summary:

 

"TROPICAL STORM PULASAN (15W)

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TS    PULASAN  2024-09-19  00:00 UT  29.6N  123.1E   45 kts  Eastern China      

 

TS Pulasan continued today with winds up to 45 kts over Eastern China. It is expected to track to the northwest over the next two days and to make landfall  ... on September 19-20. Seismicity in southern Japan is expected to be enhanced as this storm passes through the area." (September 19, 2024)

 

Readers should not that at the time of landfall of TS Pulasan it was located near 30N 122E - the earthquake in China was located at 31N 118E - about 300 km northwest of the landfall, and very likely triggered by that storm's landfall.

 

Forecast 166246 had expected today's earthquake in China within about 200 km

was likely around September 22.

 

O: 18SEP2024 12:08:16  31.9N  117.7E MB=4.9  EMSC   ANHUI, CHINA                 

P: 22SEP2024 166246    31.0N  116.0E 3.5-5.1 BAAAA  So. China                  

 

The largest earthquake of the day was an M 5.7 in the northern Kermadec Islands, New Zealand. It was not reported felt in this remote area. This event was not reported felt in this remote area. The last earthquake of M>=5.7 in the northern Kermadec Islands within about 200 km of today's  epicenter was an M 6.2 on May 31, 2024 and an M 5.8 on March 20, 2022 – both abut 150 km south of today's epicenter. At the time of the May, 2024 event this summary noted:

 

"A moderate M 5.2 occurred towards the end of this flare in the Kermadec Islands within minutes of local solar noon and may have been triggered by SFE associated with this flare. Two moderate aftershock of the M 6.2 mainshock in the Kermadec

Islands occurred within minutes of local solar noon and were probably promoted by energy associated with the full moon which maximize near this hour. This is the strongest earthquake in the Kermadec Islands within about 200 km of this epicenter since an M 7.1 more than a year ago on April 24, 2023 about 150 km southwest of today's epicenter. At the time this summary noted:

 

 

"A major M 7.1-7.2 earthquake occurred at the height of this geomagnetic storm in the area of the Kermadec Islands, New Zealand. A tsunami of small height was possible with this earthquake but only locally. It was not reported felt

in this remote area. An M 6.9 in the Kermadec Islands of March 4, 2023 followed a major geomagnetic storm of February 27-28, 2023." (April 24, 2023, May 31, 2024))

 

Today's event of M 5.7 also occurred within minutes of local solar noon and was probably promoted by strong tidal stresses with today's full moon.

 

Forecast 166353 had expected this activity in the northern Kermadec Islands was likely towards the end of September.

 

O: 18SEP2024 11:53:56  27.4S  176.6W Mw=5.7  EMSC   KERMADEC ISLANDS REGION

O: 19SEP2024 04:10:22  27.5S  176.4W mb=4.7  EMSC   KERMADEC ISLANDS REGION

O: 19SEP2024 04:01:59  27.3S  176.4W MB=4.7  EMSC   KERMADEC ISLANDS REGION      

P: 27SEP2024 166353    29.0S  176.0W 4.0-5.4 CBAAA  No. Kermadec Islands       

 

An earthquake of M 5.5 also occurred today in the northern Andaman Islands of India. This event occurred within minutes of local solar noon and was probably promoted by strong tidal stresses associated with today's full moon. The last earthquake of equal or larger magnitude within the northern Andaman Islands within about 200 km of this epicenter was an M 5.6-5.9 on July 28, 2023. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 5.9 in the Andaman Islands, India. NEIC reported it was felt with intensity V in the Andaman  and Nicobar Islands at Bobuflat and Point Blair. This earthquake may be related to stresses associated with the upcoming full moon as it occurred near the longitude of maximum stress with that alignment.  

…

 

(July 28-29, 2023)

 

The M 5.6-5.9 in the Andaman Islands today is the strongest event in that area within about 250 km since an M 6.5 on May 31, 2010. When an M 6.1 occurred about 300 km northeast of today's epicenter on July 17, 2020, this summary noted:

 

 

"This activity included an M 6.1 in the Andaman Islands and an M 5.3 in Myanmar.

The strongest earthquake in the world today occurred as an M 6.1 in the Andaman Islands, India. NEIC reported it was felt with intensity I-II in Port Blair and Bombuflat, Andaman and Nicobar Islands, India. The M 6.1 was accompanied by a series of moderate foreshocks and aftershocks including events of M 4.8 and  M 5.6 near local solar midnight, a prime time for tidal triggering. The Andaman Islands are capable of great earthquakes but the last of M>=6.1 within about 250 km of today's epicenter was an M 6.5 more than 10 years ago  on May 31, 2010. The area was active to the north following the great tsunamigenic quake of Boxing Day (December 26, 2004) which killed upward toward a quarter million around the Indian Ocean. Strong quakes followed every two years after that up to 2010 when quiet conditions returned to the region." (July 17, 2020, July 28, 2023)

 

Forecasts 116148 and 166147 had expected this area would see enhanced seismicity in mid-September within about 50 km of this epicenter.

 

 

O: 19SEP2024 05:20:58  10.6N   91.7E MW=5.5  EMSC   ANDAMAN ISLANDS, INDIA REGION

P: 13SEP2024 116148    11.0N   92.0E 4.0-5.5 CAAAA  Andaman Islands            

P: 28SEP2024 166147    11.0N   92.0E 4.0-5.4 CAAAA  Andaman Islands            

 

The strongest earthquakes in the U.S. or Canada today were aftershocks in the Queen Charlotte Islands of Canada. These included an M 3.2 and M 4.7. They were not reported felt in this epicentral area.

 

Forecasts 116304 had expected this activity within about 100 km was likely around September 20.

 

O: 18SEP2024 21:56:32  51.4N  130.9W ML=3.2  EMSC   HAIDA GWAII REGION

O: 18SEP2024 12:02:12  51.6N  130.6W ML=4.7  EMSC   HAIDA GWAII REGION           

P: 25SEP2024 166309    50.3N  130.2W 3.0-5.0 CBAAA  British Colombia           

 

 

UNUSUAL MODERATE QUAKE SHAKES SOUTHERN MADAGASCAR

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 17, 2024

 

 

The most unusual earthquake in the world today was an M 5.2 off southern Madagascar. NEIC reported it was felt with intensity IV in Madagascar at Taolanaro, Toliary. Moderate but solid shaking with a significant noise was reported by EMSC in Madagascar at Fort-Dauphin. This epicenter in Madagascar is near the antipode of the dissipating Hurricane Ileana in the north Pacific and may also have been triggered by antipodal effects from that storm.  This is the strongest earthquake south of Madagascar within about 500 km of today's epicenter since an M 5.3 on January 25, 2013 that occurred about 500 km northeast of today's epicenter. At the time this summary noted:

 

 

"The earthquake in Madagascar is highly unusual. It is the strongest to hit that region in at least 23 years. The only other moderate event within 300 km of this epicenter in the past 25 years was an M 5.0 on November 14, 1992 north of today's epicenter. A strong change in the geomagnetic field strength began between 2100 UT and 2200 UT when Madagascar was directly anti-solar (local solar midnight). This was apparently triggered by an equally strong change in the electron flux in the solar wind which dropped at the same time and was at its maximum state of change when the Madagascar event occurred. The antipode of Madagascar is east of Hawaii in the central Pacific Ocean but seismicity in Hawaii may also be affected by this geomagnetic change.  The change in the geomagnetic field led to a short geomagnetic storm beginning about 0000 UT on January 26. The earthquake in Madagascar was reported felt with intensity V in Toliary, Madagascar." (January 25, 2013)

 

Today's earthquake in Madagascar occurred within about an hour of the full moon and eclipse today and was probably promoted by strong tidal stresses with this alignment. It also coincided with a strong geomagnetic storm which reached the strongest AP level (71) today since an AP of 273 was recorded on May 11, 2024, another factor which helped trigger the Madagascar quake at this time.

 

O: 18SEP2024 00:25:14  25.7S   47.2E MB=5.2  EMSC   MADAGASCAR                   

 

An aftershock of M 4.4 also occurred today in Turkey in the ara of Malatya and Yesilyurt where NEIC reported it was felt with intensity II-III. EMSC reported solid shaking in Turkey was observed in Orduzu, Basharik, Zaviye, Ozalper, Cumhuriet, Atakent, Narlikuyu, Ali Baba, Batikent, Sair Nabi, Pinarbasi, Nizip, Sahinbey, Yeditepe. An M 4.1 aftershock was also felt in the area lightly at Zaviye, Cumhuriyet, Sumereevler, Adiyaman, Turkey.

 

The area saw an M 5.0 earthquake on September 7, 2024 about 150 km southwest of today's epicenter but the last of significantly larger magnitude within this area was an M 5.0 on January 24, 2024.

 

Forecasts 116253 and 116291 had expected moderate seismicity in Turkey at this time.

 

O: 18SEP2024 00:22:23  38.1N   38.4E MB=4.1  EMSC   EASTERN TURKEY               

P: 15SEP2024 116253    38.0N   39.0E 3.5-5.0 BAAAA  Turkey                     

 

EMSC reported an earthquake of M 4.0 in Western Turkey was felt with intensity up to IV in the area(s) of Western Turkey in Kapakli, Hurriyet, Ataturk, Kethuda, Cumhuriyet, Evka, Adalet, Plevne, Yali, Kasaplar, Pelitkoy, Cuneytbey, Fatih, Ege, Kadinlardenizi, and in Greece at Linopois (Maybe).

 

O: 17SEP2024 11:22:57  39.0N   27.7E ML=4.0  EMSC   WESTERN TURKEY               

P: 19SEP2024 116291    41.0N   29.0E 3.0-5.1 ABAAA  Romania/NW Turkey          

 

A new eruption of Kilauea volcano continued today. This eruption apparently was kicked off by the X4.8 solar flare combined which was followed by an M 4.4 in Hawaii and a series of aftershock and  with the tidal stresses associated with the full moon and eclipse today. This summary had noted this in previous issues as:

 

"The Full Moon will arrive at 02:34 UT on September 18, 2024. This is a "super-moon" (Where the moon is closest to earth) and involves a partial lunar eclipse. The eclipse will be visible in North America, Europe and Africa and may enhance seismicity those areas especially near the equator. Longitudes which will be at local solar midnight at this time are near 40 West while those at local solar noon are near 140 East. These zones include the central Atlantic and Iceland and western Europe in the west and the Kuril Islands, Japan and portions of eastern Indonesia and New Guinea and the Vanuatu Islands in the east. These areas are the most likely to see tidal triggering in the week surrounding this full moon. Such events often occur near local solar midnight and noon. A major earthquake is considered likely with this new moon in the 10 days." (September 14-16, 2024)

 

The strongest earthquakes in the U.S. or Canada today were aftershocks in the Queen Charlotte Islands of Canada. These included an M 4.2 and M 4.7. They were not reported felt in this epicentral area.

 

Forecasts 116304 had expected this activity within about 100 km was likely

around September 20.

 

O: 18SEP2024 12:02:09  51.3N  130.9W MB=4.7  ECAN OF PORT HARDY, BC  

O: 17SEP2024 14:08:44  51.5N  130.9W MB=4.2  ECAN OF PORT HARDY, BC  

O: 17SEP2024 14:08:44  51.5N  130.9W ML=4.2  EMSC   HAIDA GWAII REGION           

P: 20SEP2024 116304    52.0N  132.0W 3.0-4.9 AAAAA  British Colombia           

 

A series of light earthquakes occurred off the northern coast of California today. NEIC reported these earthquakes of M 3.2 and 3.0 off the coast of Northern California was felt with intensity up to I in the area(s) of Northern California at McKinleyville. These events of M 2.4, 2.8 and 3.0 occurred near local solar noon and may have been promoted by today's full moon. These may indicate built up stress in the area and could be precursory activity to a larger event in the region in the next 7-10 days.

 

Forecast 116284 had expected this activity within about 50 km was likely around

September 17, 2024.

 

O: 17SEP2024 18:53:21  40.4N  125.1W ML=3.0  EMSC   OFFSHORE NORTHERN CALIFORNIA 

O: 17SEP2024 19:16:41  40.4N  125.3W MD=2.4  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 17SEP2024 19:36:05  40.4N  125.1W MD=2.8  EMSC   OFFSHORE NORTHERN CALIFORNIA

P: 17SEP2024 116284    40.5N  125.8W 2.5-4.8 AAAAA  Off Coast of No. Calif     

 

 

MODERATE EARTHQUAKE SHAKES WESTERN TEXAS WITH FULL MOON

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 16, 2024

 

 

The strongest earthquake in the U.S. or Canada today was an M 5.1 in western Texas. NEIC reported it was felt with intensity V in Texas at Lamesa, Abilene; IV in Tarzan, Lenorah, Stanton, Ackerly, Odonnell, Sterling City, Loraine, Big Lake, San Angelo, Miles, Ozona, Muleshoe Abilene, Paint Rock, Paducah, Clyde, Ingram and Roswell, New Mexico. Intensity III was felt as far as Midland, Texas and Oklahoma City. Lesser shaking was reported in the states of Oklahoma, California, Michigan, and New Mexico. EMSC reported moderate shaking in Texas at Midland, Greenwood, Odessa, with rumbling noise, San Angelo, Lubbock, Brownwood, Amarillo, Mullin, Austin and in Carlsbad, New Mexico. This earthquake was probably promoted by strong tidal stresses which maximize tomorrow with the full (Super) moon and partial eclipse as noted in this and previous issues of this summary:

 

"The Full Moon will arrive at 02:34 UT on September 18, 2024. This is a "super-moon" (Where the moon is closest to earth) and involves a partial lunar eclipse. The eclipse will be visible in North America, Europe and Africa and may enhance seismicity those areas especially near the equator. Longitudes which will be at local solar midnight at this time are near 40 West while those at local solar noon are near 140 East. These zones include the central Atlantic and Iceland and western Europe in the west and the Kuril Islands, Japan and portions of eastern Indonesia and New Guinea and the Vanuatu Islands in the east. These areas are the most likely to see tidal triggering in the week surrounding this full moon. Such events often occur near local solar midnight and noon. A major earthquake is considered likely with this new moon in the 10 days." (September 14-16, 2024)

 

While today's event did not occur near noon or local midnight the timing of this event within a day of the full moon and eclipse suggests tidal triggering. Tidal triggering has been previously noted in earthquakes in western Texas in this summary. For example following the solar eclipse which was seen in  this area on April 8, a pair of earthquakes of M 4.3 and 4.4 hit near today's epicenter. At the time this summary noted this as:

 

 

 

"A moderate earthquake of M 4.4 occurred in Western Texas today. NEIC reported it was felt with intensity up to VI in Stanton, Texas. An aftershock of M 2.7 was also reported felt with intensity IV in Stanton. This earthquake of M 4.3  is the strongest within about 100 km of this epicenter in more than a year. An M 4.7 hit about 100 km east of this on February 16, 2023. Larger earthquakes of M 5.4 on December 16 2022; and M 4.5 on December 27, 2021 have also hit the area in the past 10 years - since an M 4.3 on September 11, 2011. The total eclipse of the sun passed over this epicenter on April 8 and was at maximum eclipse at 18:32 UT on April 8, 2024. Today's M 4.4 occurred at 18:46 UT within several minutes of local solar noon and was probably promoted by high tidal stresses. It is also likely that today's event in Texas was promoted by the strong tidal stresses associated with the solar eclipse." (April 10, 2024)

 

 

The strongest earthquake in the U.S. or Canada today was an M 5.2 in the Mentone  area of Texas. It was reported with intensity up to VI in Mentone, Texas and with moderate shaking in Carlsbad, New Mexico an in Fabens, El Paso, Texas among others and when a similar M 5.2 occurred on November 8, 2023 this summary noted:

 

 

"This event was probably promoted by well injection of waters following fracking and extraction of oil and gas in the region. This may also have been promoted by geomagnetic effects associated with the current geomagnetic storm and/or by tidal stresses associated with the upcoming new moon as described in this issue in previous summaries" (November 8, 2023)

 

Likewise an M 4.2 in the region on October 18, 2023 with a solar eclipse had been noted here as:

 

"An unusually large earthquake of M 4.2 occurred today in western Texas. NEIC reported these earthquakes of M 3.5 and M 3.9-4.2 in Western Texas were felt with intensity II-III in the area(s) of  Alamogordo, New Mexico. The last earthquake within about 100 km of this epicenter with M>=4.2 occurred as an 5.4 on December 16, 2022. It is likely that today's earthquakes had its magnitude enhanced by the solar eclipse and new moon of October 14, 2023. The epicenter was at a location where the complete solar eclipse was visible for nearly five minutes around 16:42 UT (09:42 local time). This is an especially clear example of eclipse related enhanced seismicity" (October 18, 2023)

 

NEIC reported an aftershock of M 2.5 in Western Texas was felt with intensity up to II in the area(s) of Western Texas in Seminole and Big Spring.

 

A discussion of historical earthquakes in this region of Texas was provided

in this summary on December 16, 2022 as:

 

 

"A moderate earthquake of M 5.4 was widely felt in Western Texas and New Mexico today. NEIC reported it was felt with intensity IV in Texas at Midland, Stanton, Gardendale, Odessa, Andrews,. Ackerly, Lamesa, Big Spring, Garden City, Seminole, Kermit, Midkiff, Crane, among others; in Ne Mexico with III-V in Jal, Hobbs, Lovington, and as far as Houston, Texas, Los Alamos, New Mexico, Oklahoma City, Oklahoma, Colorado Springs, Colorado, Camden Arkensas, Missouri, Kansas, Nebraska and Illinois. This is the largest shock in this area of continuing seismicity since the area became active. It is also among the top five earthquakes ever recorded in the State of Texas. No major damage was reported. This epicenter is in the active oil extraction and fracking area of Texas and may have been artificially induced. The epicenter is not at the same locations which have recently seen sizable increases in seismicity but appears to be midway between them and represents a new area to add to the several active regions of western Texas.

 

...

 

 

 

As noted above the epicenter of today's M 5.4 is more than 100 km east of the currently active regions of western Texas near 103.5W and 104.5W and represents a new area of seismic enhancement. The largest earthquake within about 100 km  of today's epicenter in recent years included an M 4.0 on June 6, 2022 and an M 4.5 on December 28, 2021 -  the only such events of M>=3.5 in this area in the past 35 years. Earthquakes in Texas with M>=5.4 have historically been rare. The only such event recorded in this state of equal or larger magnitude were an M 5.6-6.4 on August 16, 1931; an M 5.5 on June 17, 1959 and an M 5.7 on April 14, 1995. The events in 1995 and 1931 occurred in the western Permian Basin near the current series prior to today while the event in 1959 was in northern Texas near the Oklahoma border. The "HISTORY" section of this summary has previously noted these events as:

 

October 16, 1931:

 

This was the largest historical earthquake recorded in Texas. Severe damage was located in the Valentine area where wooden buildings were extensive damaged and chimneys fell. Walls of adobe buildings and of concrete and brick walls were also collapsed. Landslides were common and well water and springs were muddied throughout the area. Felt in Oklahoma, New Mexico and northern Mexico.

 

June 17, 1959:

 

This event was felt over approximately 12,000 square miles of Oklahoma and Texas. The maximum intensity was in the Duncan, Oklahoma area (VI with damage) and Lawton OK where cracks in pavement occurred and plaster was cracked. Houses moved and many objects were observed to move. The event was accompanied by thunderous and roaring sounds. Several water mains were reported broken in Duncan.

 

April 14, 1995:

 

Two people slightly injured in Brewster county, Texas. Slight damage at Alpine and Fort Davis. Also slight damage in Marathon and Ozona area. Felt in much of western and central Texas as far east as San Antonio and the Dallas-Fort Worth area. Felt west as far as Sierra Blanca, Texas and north to Roswell, New Mexico." (December 17, 2022)

 

Today's event of M 5.1 in Texas had been expected in forecast 116231 to occur around September 17, 2024 within about 100 km of this epicenter.

 

O: 17SEP2024 00:49:41  32.4N  102.1W ML=5.1  EMSC   WESTERN TEXAS                

O: 17SEP2024 05:46:36  32.4N  102.0W ML=2.8  EMSC   WESTERN TEXAS

P: 17SEP2024 116231    31.4N  101.8W 2.0-4.2 AAAAA  SW U.S.A                   

 

An M 5.2 earthquake was felt widely in eastern Europe today. The epicenter was at an intermediate depth and the cone of felt activity extended into Ukraine, Moldova, Austria, Romania with maximum shaking V in Romania at Lumina, and Calarasi. No damage was reported. EMSC reported this event was felt with moderate intensity throughout Romania and Moldova, Ukraine, Bulgaria, Serbia, and Turkey. This is the largest earthquake since a shallow event of M 5.5-5.6 in western Romania on February 14, 2023 - an event which did considerable damage in the region. At the time this summary noted:

 

 

"No earthquakes of greater magnitude have occurred in southern Romania in at least 35 years. The last earthquakes of M 5.5-5.6 within about 200 km of today's epicenter hit west of this in Serbia on July 12 and 18, 1991." (February 14, 2023)

 

The last event at intermediate depth such as today's with M>=5.2 occurred on October 28, 2018. At the time this summary noted this as:

 

 

"A moderately strong earthquake of M 5.6 hit the region of Romania today. The hypocenter in located at about 150 km depth in a piece of detached slab which is still in the process of breaking. Earthquakes of this type occasionally occur in this area and are felt lightly on the surface with a large cone of felt activity. Most of the areas reporting intensity II-IV occurred at more than 150 km from the epicenter in this cone. NEIC reports of felt activity with this quake included communities as far as 350 km from this epicenter. EMSC included more than 1400 felt reports with maximum intensity V. Among communities feeling maximum shaking from this earthquake in Romania are Valenii de Munte, Gornet Prahova, Brasov, Suhaia, Constanta, Iasi, Ramnicu, Suditi Ialomita, Pitesti, Bragadiru, Curtea de Arges, Ppoesti-Leordeni, Slobozia, Fundeni, Florest-Stoenesti, Bucharest, Dobroesti, Voluntan, Galati, Mogosoaia, Stefanestii, Buftea, Corbeanca, Marginenci, Ploiesti, Comu Parhova, Romania. It was also reported lightly felt in Bulgaria, Ukraine, Albania, Italy, and Germany.

The last earthquake in Romania with M>=5.6 occurred on December 27 and September 23, 2016. The last of M>5.6 was an M 5.9 on October 27, 2004 exactly 14 years ago. An M 7.0 also hit the region of Romania on May 30, 1990, the only other event of M>=5.6 in the region in the past 30 years. Because of the depth of these events (around 90 km) they are only felt lightly on the surface and many Romanians do not recognize that Romania is a seismic nation ..." (October 28, 2018)

 

The last earthquake in Romania of M>=5.2 was an M 5.5 on October 28, 2018.  Forecast 116292 had expected today's event within about 50 km was likely around September 19.

 

O: 16SEP2024 14:40:22  45.6N   26.3E MW=5.2  EMSC   ROMANIA                      

P: 19SEP2024 116292    46.0N   27.0E 3.0-5.1 BAAAA  Romania/NW Turkey          

 

 

The strongest earthquake of the day was an M 6.3 in the Saipan area of the Mariana Islands north of Guam. NEIC reported intensity II-III in the Mariana Islands at Tinian, Saipan, and in Guam at Rota, Yigo, Tamuning, Mangilao, Asan, Yona, Piti and Santa Rita. EMSC reported moderate shaking in northern Mariana Islands at Dandan, Koblerville, and in Santa Rita, Guam.

 

NEIC reported an earthquake of M 5.0 in Guam  followed the M 6.3 in the Mariana Islands and was felt with intensity up to IV in the area(s) of  Guam at Tamuning, Santa Rita, Merizo, Mangilao, Piti and MongMong. It is likely that this event was promoted by the passage of an ocean storm, a common coincidence in Guam. In the previous update this summary had noted this possibility at this time:

 

"A tropical weather system is forming near Guam, Mariana Islands. This is currently located over Guam at 13N 144E and tracking NNE with winds up to 23 kts. It could enhance regional seismicity in Guam while in the vicinity." (September 16, 2024)

 

The last earthquake in the Mariana Islands of M>=6.3 occurred on April 5, 2024 north of today's epicenter. At the time this summary noted:

 

 

"The strongest earthquake of the day was an M 6.8 in the northern Mariana Islands. NEIC reported it was felt with intensity up to IV in the Maug Islands. EMSC reported strong shaking in the Northern Mariana Islands at Kagman II, San Vicente, Dandan, San Jose, Mangilao, Guam and Kagman Vlg, Saipan. This follows a series of strong earthquakes in the area of northern Mariana Islands and Volcano Islands, Japan in the past several months including an M 6.9 on November 24, 2023 on November 24, 2023. Major earthquakes in the past 35 years hit the region at intermediate and deep focus on July 29, 2016 (M 7.7); May 14, 2013 (M 6.8); October 31, 2007 (M 7.2) and August 23, 1995 (M 7.1)." (April 5, 2024)

 

Forecast 116166 had expected today's M 6.3 was likely within about 100 km of the epicenter was likely around September 15, 2024.

 

O: 16SEP2024 11:36:33  17.1N  147.2E MW=6.3  EMSC   MARIANA ISLANDS REGION       

P: 15SEP2024 116166    18.0N  148.0E 4.0-5.6 AAAAA  No. Marianas               

 

O: 16SEP2024 18:12:00  13.0N  144.2E MW=5.0  EMSC   GUAM REGION                  

P: 12SEP2024 116172    14.0N  145.0E 4.0-5.5 BAAAA  So. Marianas/Guam          

P: 19SEP2024 116172    12.0N  144.0E 4.0-5.5 BAAAA  So. Marianas/Guam          

 

An earthquake of M 5.5 also occurred today in Kyushu, Japan. This event occurred near local solar midnight and was probably promoted by geomagnetic and tidal stresses which maximize near this hour. This event is the strongest aftershock to day of the M 7.1 which occurred on August 8, 2024. At the time this summary noted:

 

"This is the strongest earthquake in Kyushu, Japan within about 250 km in at least 35 years. Earthquakes of M 7.0 hit the area on October 19, 1996 and on April 15, 2016." (August 8, 2024)

 

 

A moderately strong earthquake of M 5.5 occurred in Kyushu, Japan today. It was felt in Kagoshima and Kyushu, Japan in Kagoshima and Kanoya; in Hamamatsu, Shizuoka, Saiki, Oita and with V in Osaka, Japan. NEIC reported an aftershock of M 4.7 in Kyushu, Japan was felt with intensity up to IV in the area(s) of Kyushu, Japan in Kagoshima.

 

Forecast 116215 had expected today's event of M 5.5 in Kyushu was likely within about 50 km around September 17, 2024.

 

O: 16SEP2024 14:25:42  31.6N  131.7E mb=4.7  EMSC   KYUSHU, JAPAN

O: 16SEP2024 14:13:47  31.6N  131.7E MW=5.5  EMSC   KYUSHU, JAPAN                

P: 17SEP2024 116215    32.0N  132.0E 3.5-5.1 AAAAA  Kyushu, Japan area         

 

An M 3.7 aftershock of the M 4.7 of September 12 occurred today in the Malibu region of Los Angeles, California. It was widely felt in the area with maximum intensity V in Malibu and Sun Valley and IV in Los Angeles and Northridge with III in Fallon, Culver City, Hawthorne, Hermosa, Lawndale and Manhattan Beach among others. There were no reported injuries or damage with this earthquake.

NEIC reported aftershocks of M 2.8 in Malibu, Southern California were felt with intensity up to IV in the area(s) of Malibu, Southern California in Agoura Hills, Westlake Village, Calabasas, Thousand Oaks, Oak Park, Newbury Park, Woodland Hills, Moorpart, Sherman Oaks, Torrance among others.

 

Forecast 116237 had expected today's M 3.5 was likely within about 10 km around

September 14.

 

O: 16SEP2024 11:22:08  34.1N  118.8W ML=3.5  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 17SEP2024 05:33:08  34.1N  118.8W ML=2.7  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 16SEP2024 14:05:22  34.0N  118.8W ML=2.7  EMSC   GREATER LOS ANGELES AREA, CALI

P: 14SEP2024 116237    34.0N  118.7W 2.5-4.5 AAAAA  So. California             

 

An earthquake of M 4.5 also occurred today in the eastern Andreanof Islands, Aleutians, Alaska. NEIC reported this earthquake of M 4.5 in the Andreanof Islands, Alaska was felt with intensity up to III in the area(s) of the Andreanof Islands, Alaska in Atka. The last earthquake within about 200 km of today's epicenter with M>=4.5 occurred  as an M 4.8 on July 29, 2024.

 

Forecast 116303 had expected today's M 4.5 within about 10 km was likely around

September 16.

 

O: 16SEP2024 18:52:27  51.9N  173.7W ML=3.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 16SEP2024 16:01:20  52.3N  173.8W mb=4.5  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 16SEP2024 19:41:01  51.1N  172.0W ML=3.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 16SEP2024 116303    52.2N  173.9W 3.5-5.0 AAAAA  Andreanoff Isls, Aleutians 

 

 

STRONG EARTHQUAKE SHAKES QUEEN CHARLOTTE ISLANDS, CANADA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 15, 2024

 

The strongest earthquake in the world today was an M 6.5 in the Queen Charlotte Islands area of British Columbia, Canada. The mainshock was reported by NEIC to have been felt with intensity up to III in Washington State in Seattle, and in Portland Oregon and possibly as far as California. A foreshock of M 4.5 occurred 43 minutes before the mainshock but was not reported felt. No tsunami threat was issued with this earthquake. Aftershocks were reported felt with light intensity in British Columbia, Canada. This earthquake occurred near the time of the full moon near local solar noon and was probably promoted by energy associated with strong tidal stresses as noted in previous issues of this summary:

 

"The Full Moon will arrive at 02:34 UT on September 18, 2024. This is a "super-moon" (Where the moon is closest to earth) and involves a partial lunar eclipse. The eclipse will be visible in North America, Europe and Africa and may enhance seismicity those areas especially near the equator. Longitudes which will be at local solar midnight at this time are near 40 West while those at local solar noon are near 140 East. These zones include the central Atlantic and Iceland and western Europe in the west and the Kuril Islands, Japan and portions of eastern Indonesia and New Guinea and the Vanuatu Islands in the east. These areas are the most likely to see tidal triggering in the week surrounding this full moon. Such events often occur near local solar midnight and noon. A major earthquake is considered likely with this new moon in the 10 days." (September 14-16, 2024)

 

Two other factors probably influenced the timing of the M 6.5 in Vancouver today. These include landfall of Tropical Cyclone Eight off South Carolina and an X4.8 solar flare which occurred yesterday. This flare was described in the previous update of this summary as:

 

"A strong X4.3 solar flare occurred today with the following parameters from SWPC. This is the strongest solar flare since an X5.8 on May 11, 2024 (#1680).

 

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

1830       1513   1529      1547   X4.5      (September 14, 2024)   5.8E-01  

 

When the X5.8 occurred  on May 11, 2024 occurred this summary noted:

 

"It was followed at the end of the flare by an M 4.6 earthquake in Southern Alaska. This earthquake was reported by EMSC to have been felt with light to moderate intensity in Southern Alaska at Anchor Point and Anchorage." (May 11, 2024)

 

Similar earthquakes in Alaska occurred in the hours following this flare as

an M 5.0 in Western Andreanof Islands, Alaska; an M 4.3 near Tatitlek, Alaska in Southern Alaska and an M 3.2 and several associated quakes near Perryville, Alaska.

 

This flare was followed by an M 4.4 in Hawaii with foreshocks and aftershocks and an M 3.8 in Western Texas with a number of minor aftershocks. An M 5.3 in Guam occurred at a longitude which was at local solar midnight when this flare peaked and may have been promoted by Solar Flare Effects (SFE)." (September 15, 2024)

 

 

This earthquake in Queen Charlotte Island occurred as Tropical Storm Eight made slopefall off of South Carolina. Earthquakes in Vancouver and Queen Charlotte Islands often appear to be triggered by landfall of strong ocean storms on the east coast of the U.S. A brief summary was provided by this report when an M 5.5 in Vancouver occurred a year ago on September 17, 2023 as:

 

"The strongest earthquake in the world today was an M 5.6-5.9 west of Vancouver Island, British Columbia, Canada. NEIC reported it was felt with light shaking I-III in British Columbia at Parksville, Gibsons, Vancouver and perhaps as far as Oregon and Northern California. Foreshocks of M 4.5 and 4.3 preceded the mainshock and may have been felt lightly in the epicentral area.

 

This enhanced seismicity in British Columbia, Canada had been anticipated in this summary in the past several issues. It began two days ago with a strong series of moderate quakes as described at the time in this summary:

 

 

"A series of light to moderate earthquake with maximum events of M 4.2 occurred today in the region near Vancouver, British Columbia, Canada. These events centered near local solar noon and were probably promoted by the new moon tidal stresses today which maximized near this time

 

…

 

and continued in the previous issues of this summary as:

 

 

"The strong swarm of earthquakes yesterday in the area of Vancouver Island, British Columbia ceased abruptly today with only a minor earthquake recorded in the area. This swarm coincided with landfall of Hurricane Lee in Maine and Nova Scotia, Canada. This storm has been called a summer "nor'easter" because of its strength and characteristics. This summary has taken a clear stance on the likely connection between nor'easters and coincidental major activity in the northwestern U.S. and southwestern Canada as typified by the summary of January 29, 2022:

 

 

" ... a major nor'easter is beginning to progress up the eastern coast of the U.S. It may hit the Boston area with record snows today and on Saturday, January 29, 2022. Such nor'easters are often associated with a strong enhancement of seismicity along the western North American tectonic plate. A precautionary seismic watch is being called by this summary for this region through February 2, 2022." (January 27, 2022)

 

and more recently:

 

"The strongest earthquakes in the U.S. or Canada today occurred as an M 4.3

near Vancouver Island and as an M 3.8 in the Queen Charlotte Islands area of British Columbia.  These were not reported felt. This may related to a nor'easter hitting the northeastern U.S. at this time. Larger earthquakes in the Vancouver and Queen Charlotte Island area of Canada often occur in conjunction with strong nor'easters on the opposite side of the North American Plate." (March 14, 2023)

 

A stronger earthquake in the Vancouver or Queen Charlotte region is possible with landfall of Hurricane Lee today in Nova Scotia and Newfoundland.

 

Hurricane Lee has been described in this and previous issues of this summary as:

 

"Hurricane Lee continued today in the area of north of Nova Scotia with winds up to 50 kts (category 1 hurricane). It is expected to track to the north and east and may enhance seismicity in the Northeast U.S and Quebec, Canada as it makes landfall in that area around  of Nova Scotia on September 17 in the next week. Interactions with the North American Plate may also trigger moderate to strong seismic enhancement in areas of coastal western Canada and northwestern U.S. at this time. Coastal flooding in Maine is considered marginal by NHC but more intense effects are possible along the coasts of eastern Canada." (September 16-17, 2023)

 

The last earthquake of M>=5.9  within about 100 km of today's epicenters in Vancouver was an M 6.3 on December 25, 2019, part of a series of events in the area that started with two of M 6.0 on December 23, 2019. At the time this summary noted:

 

 

"Other factors which probably affected the timing of the activity in Vancouver, Canada probably included strong meteorological storms which dropped up to 12 inches on areas of the southeast U.S. and in Washington State and British Columbia and the geomagnetic storm  of December 19-20.

 

...

 

The last earthquake in the Vancouver Island area of M>=6 was an M  6.5 on July 4, 2019 with the regional seismic activation of early July, 2019. A swarm  hit southeast of today's events on October 22, 2018 (M 6.8, 6.5, 6.5) and in January,  2008 (M 6.4, 6.0 ..) and September 2013 (M 6.0, 6.0, 6.1)." (December 23, 2019, September 17, 2023)

 

Forecasts 116304 had expected enhanced seismicity within about 100 km of today's event of M 6.5 was likely around September 14-20 in the area of British Columbia.

 

O: 15SEP2024 23:26:46  51.3N  131.0W MB=4.5  ECAN WSW OF BELLA BELLA, BC 

O: 15SEP2024 22:22:50  51.6N  130.7W Mw=6.5  EMSC   QUEEN CHARLOTTE ISLANDS REGION

O: 15SEP2024 21:39:56  51.7N  130.7W mb=4.5  EMSC   QUEEN CHARLOTTE ISLANDS REGION

O: 15SEP2024 22:22:47  51.7N  130.6W MB=6.0  ECAN W OF BELLA BELLA, BC 

O: 16SEP2024 01:43:28  51.4N  130.9W MW=4.7  EMSC   QUEEN CHARLOTTE ISLANDS REGION

P: 14SEP2024 116304    50.3N  130.2W 3.0-5.1 ABAAA  British Colombia           

P: 20SEP2024 116304    52.0N  132.0W 3.0-4.9 BAAAA  British Colombia           

 

An M 2.5 earthquake occurred today in South Carolina. NEIC reported it was widely felt with intensity up to IV in Southeastern U.S. including IV in Lugoff, SC and II-III in Elgin, Columbia, Camden, Ridgeway, Blythewood. This earthquake may have been triggered by stresses associated with Tropical Cyclone 8 which made slopefall about the time this earthquake occurred as noted in this an previous issues of this summary:

 

"Tropical Cyclone Eight formed off the coast of South Carolina today with winds up to 60 kts. It is expected to move inland and to dissipate over South Carolina and North Carolina in the next several days. Landfall on the Continental slope may have helped trigger the M 6.5 in Vancouver, BC at the same time. This has been seen on previous occasions and commented on in this summary." (September 16, 2024)

 

and

 

"A minor storm may be forming off the coast of South Carolina. This system may intensify and threaten high surge in South Carolina and minor earthquakes. It is currently located at 32N 79W with winds up to 40 kts." (September 15, 2024)

 

Forecast 116246 had expected today's earthquake in South Carolina was likely within about 50 km around September 12, 2024.

 

O: 15SEP2024 22:01:44  34.2N   80.7W ML=2.6  EMSC   SOUTH CAROLINA               

P: 12SEP2024 116246    34.0N   80.0W 2.0-4.7 BAAAA  Southeast U.S.             

 

An unusual earthquake of M 5.5 was also recorded in Indonesia today in the region of Kalimantan. NEIC reported maximum intensity V in Kalimantan at Tanjung Redeb and IV in Bontang. BMG reported it was felt with intensity IV in Karangan, Kutai Timur, Maratua, Berau, Kalimantan Timur and III in Kab. Berau, Kutai with lesser shaking in Samarinda, Bontang, Bulungan, Malinau, Tarakan, Donggala and Toli Toli, Indonesia. NEIC reported this earthquake of M 4.7 in Samar, Philippines was felt with intensity up to II in the area(s) of Samar, Philippines at Sagpon, Bicol. The last earthquake of M>=5.5 in the Kalimantan area of Indonesia within about 200 km of this M 5.5 today was located by NEIC with M  6.1 on March 6, 1995.

 

Forecast 166114 had expected today's event within about 150 km was likely around September 22, 2024.

 

O: 15SEP2024 13:08:09   1.3N  118.5E Mw=5.5  EMSC   KALIMANTAN, INDONESIA

O: 15SEP2024 13:39:06   1.3N  118.4E ML=4.0  EMSC   KALIMANTAN, INDONESIA

O: 15SEP2024 11:28:54   1.3N  118.5E ML=4.0  EMSC   KALIMANTAN, INDONESIA        

P: 22SEP2024 166114     1.0N  120.0E 4.0-5.5 CAAAA  Celebes Sea                

 

The strongest earthquake in the U.S. or Canada today was an M 5.0 in the western Andreanof Islands, Aleutians, Alaska.  NEIC reported this earthquake of M 5.0 in the western Andreanof Islands was not felt. The last earthquake of M>=5.0 in the western Andreanof Islands wa an M 5.0 on February 29, 2024. The last event of significantly larger magnitude within about 200 km of today's epicenter occurred as an M 6.4 on October 16. 2023. At the time this summary noted:

 

 

"The strongest earthquake in the world today (including the U.S. or Canada) was an M 6.4-6.7 in the Central Andreanof Islands, Aleutians, Alaska. NEIC reported two events of M 6.4 and 6.7 at this time which were felt with intensity V in Adak and II-III in Atka and possibly as far as Anchorage and Wasilla, Alaska. This event occurred within minutes of local solar midnight and was probably  promoted by the new moon and solar eclipse of October 14 which began near this epicenter

 

...

 

 

The last earthquake in the Andreanof Islands of M>=6.7 was an M 7.0 on August 30, 2013. An earthquake of M 6.4 last occurred in the area on August 15, 2018 and September 4, 2013. At the time of the M 6.4 on August 15, 2018 this summary noted:

 

"The M 6.6 in the Andreanof Islands is the strongest in the U.S. since the M 6.9 in Hawaii of May 4, 2018 and the strongest in Alaska since the M 7.9 in the Gulf of Alaska of January 23, 2018. Earthquakes of M>=6.6 have hit the region of the western Andreanof Islands on three occasions since 1990 - an M 6.6 on May 2, 2008; an M 6.9 on March 20, 1999 and events of M 7.9 and 7.3 on June 10, 1996." (August 15, 2018, October 16, 2023)

 

Forecast 116303 had expected today's earthquake in the western Andreanof Islands within about 100 km of this epicenter was likely around September 14, 2024. 

 

O: 15SEP2024 12:41:03  52.2N  179.8W MW=5.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 14SEP2024 116303    51.0N  179.9W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

 

 

STRONGEST SOLAR FLARE SINCE MAY, 2024 ENHANCES SEISMICITY

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 14, 2024

 

A strong X4.5 solar flare occurred today with the following parameters from SWPC. This is the strongest solar flare since an X5.8 on May 11, 2024 (#1680).

 

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

1830       1513   1529      1547   X4.5      (September 14, 2024)   5.8E-01  

 

When the X5.8 occurred  on May 11, 2024 occurred this summary noted:

 

"It was followed at the end of the flare by an M 4.6 earthquake in Southern Alaska. This earthquake was reported by EMSC to have been felt with light to moderate intensity in Southern Alaska at Anchor Point and Anchorage." (May 11, 2024)

 

Similar earthquakes in Alaska occurred in the hours following this flare as

an M 5.0 in Western Andreanof Islands, Alaska; an M 4.3 near Tatitlek, Alaska in Southern Alaska and an M 3.2 and several associated quakes near Perryville, Alaska. The strongest of these was an M 4.6 which occurred near the time of this  solar flare south of Alaska in the same area as the May 11, 2024 event.

 

The last earthquake within about 200 km of today's epicenter with M>=4.6 occurred on  July 23, 2024 and April 19, 2024 - both with M 4.6. The last of significantly larger magnitude in this region was an M 5.0 on January 10, 2023. At the time this summary noted:

 

 

"The strongest earthquake felt in the U.S. or Canada today was an M 4.5 in southeastern Alaska. NEIC reported it was felt with intensity III in Yakutat, Alaska. This is the strongest earthquake in southeastern Alaska within about 150 km of this epicenter since an M 5.1 on September 29, 2022.  At the time of the April event this summary noted:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.6 in the Alaska Peninsula. It was not reported felt in the area. This is the strongest earthquake in the Alaska Peninsula within about 200 km of this epicenter since an M 4.6 on June 16, 2023. The last of larger magnitude occurred a year ago on April 24, 2023 with M 4.8." (April 19, 2024)

 

Forecasts 116318 and 166304 had expected enhanced seismicity in this area was

likely in mid-September.

 

O: 14SEP2024 16:48:28  54.7N  156.7W ML=3.4  EMSC   SOUTH OF ALASKA

O: 15SEP2024 05:52:22  54.7N  156.7W ML=3.2  EMSC   SOUTH OF ALASKA

O: 14SEP2024 14:33:43  54.9N  157.0W mb=4.6  EMSC   SOUTH OF ALASKA

O: 14SEP2024 14:05:50  54.4N  159.6W ML=3.8  EMSC   SOUTH OF ALASKA              

P: 12SEP2024 116318    54.1N  162.8W 3.5-5.0 AABAA  Unimak Islands, Aleutians  

P: 23SEP2024 166304    54.8N  158.7W 3.5-4.9 CAAAA  Alaska Peninsula           

 

This flare was followed by an M 4.4 in Hawaii with foreshocks and aftershocks and an M 3.8 in Western Texas with a number of minor aftershocks.

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 in Hawaii near Kilauea Volcano. It was accompanied by a series of minor shocks both before and after the mainshock in Oklahoma. NEIC reported it was felt with maximum intensity V in Hawaii at Hawaii National Park and II-III in Hilo, Mountain View, Pahoa, Kurtistown, Keaau, Naalehu, Kailua Kona and Honokaa. EMSC reported the mainshock was felt as a light tremor in Hawaii at Volcano and Pepeekeo. Other earthquakes in Hawaii of M>=4.4 in the current year occurred on August 22, 2024 (M 4.7) and February 9, 2024 (M 5.7). At the time of the August, 2024 event this summary noted:

 

 

"The strongest earthquake located in the U.S. or Canada today was an M 4.7 in Hawaii. NEIC reported maximum shaking of IV was feltin Hawaii at Pahoa with intensity II-III at Volcano, Mountain View, Hawaii National Park, Kurtistown, Keaau, Hilo, Pahala, Papaikou, Pepeekeo, Hakalau, Honomu, Papaaloa, Naalehu, Paauilo, Laupahoehoe, Captain Cook, Holualoa, Kealakekua, Honokaa, Kamuela, Kailua Kona, Kapaau, Kualapuu, Honolulu and Waimea. EMSC reported it at M 4.7 was felt with moderate jolt in Volcano, Eden Roc, Mountain View, Pahoa, Keaau, Hilo, Pepeekeo. Several hurricanes are currently located near Hawaii and the impact of low pressures with these storms may have helped trigger today's M 4.7 in Hawaii

 

...

 

This is the strongest earthquake in Hawaii since an M 5.7 on February 9, 2024.  At the time this summary noted:

 

"The strongest earthquake in the U.S. or the world today was an M 5.7 in the Mauna Loa region of Hawaii (initially given as M 6.3). NEIC reported it was felt as far as Honolulu and throughout the island of Hawaii with intensity up to VII. Foreshocks of M 2.9 and 3.0 were also reported felt in Pahala, Hawaii with intensity up to IV.  EMSC reported strong to violent shaking in Hawaii at Naalehu, Mountain View (with loud earthquake nose) Kealakekua, Fern Acres, Keaau, Pahoa, Hilo, Kailua Kona, Pepeekeo, Honokaa, Wailea, Wailuku, Maui, Lahaina, Honolulu, Kailua, Kaneohe. Minor damage which included items being thrown from shelves and minor damage to structures was reported which included cracked walls. This is the strongest earthquake in Hawaii since an M 6.2 on October 10, 2021 and an M 6.9 on May 4, 2018 - the largest in Hawaii in the past 35 years. the only other event in Hawaii with M>=6.2 in this time period was an M 6.7 on October 15, 2006." (February 9, 2024, August 22, 2024)

 

Forecast 116155 had expected enhanced seismicity in Hawaii was likely around September 13, 2024.

 

O: 15SEP2024 02:25:06  19.4N  155.3W ML=4.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 15SEP2024 05:11:42  19.4N  155.2W MD=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 14SEP2024 23:22:04  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII     

P: 13SEP2024 116155    18.8N  155.2W 3.0-4.4 AAAAA  Hawaii                     

 

The strongest earthquake of the day was reported at M 5.7 by BMG in Sumatra following this flare. It may have been promoted by effects from the X4.5 flare.

BMG reported this earthquake of M 5.7 in Sumatra was felt with intensity up to IV in the area(s) of  Sumatra at Lumut, Tapanuli Tengah and III in Sibabangun,m Badiri, Lumut and Onan Ganhang in Kab Humband. Also reported with intensity II in Kabs Aceh, Timur, Subulussalam, Tapanuli, Nias, Langkat, Karo, Deli Serdang, Simalungun, Asahan, Labuhanbatu, Dairi, Toba Samosir, Mandailing Netal, among others. NEIC reported this earthquake of M 5.1 in Northern Sumatra was felt with intensity up to IV in the area(s) of Northern Sumatra in Pematang, Siantar, Indonesia.

 

Forecast 116124 had expected this activity within about 200 km was likely

in mid-September, 2024.

 

O: 14SEP2024 21:37:38   1.9N   99.1E MB=5.1  EMSC   NORTHERN SUMATRA, INDONESIA  

O: 14SEP2024 21:37:38   1.9N   99.1E MB=5.7  BMG    NORTHERN SUMATRA, INDONESIA  

P: 16SEP2024 116124     0.0N   99.0E 4.0-5.6 ABAAA  So. Sumatera               

P: 18SEP2024 116124     1.0N   97.0E 4.0-5.4 BABAA  Nicobar Islands            

 

 

An M 5.3 in Guam occurred at a longitude which was at local solar midnight when this flare peaked and may have been promoted by Solar Flare Effects (SFE). The strongest earthquake of the day was an M 5.3 in Guam. NEIC reported it was felt with intensity V in Guam at Hagatna Hts; IV in Hagatna, Yona, Santa Rita, Mangilao, Piti, Sinajana and III in Tamuning, Dededo, and Asan. EMSC reported it was felt as a jolt in Guam at Santa Rita, with violent shaking in Mangilao and Tamuning. Forecast 116172 had expected this event within about 100 km was likely around September 12.

 

O: 14SEP2024 11:41:34  13.1N  144.2E MB=5.3  EMSC   GUAM REGION                  

P: 12SEP2024 116172    14.0N  145.0E 4.0-5.5 AAAAA  So. Marianas/Guam          

 

 

MODERATE EARTHQUAKE AMONG TYPHOONS IN KYUSHU, JAPAN

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 13, 2024

 

The strongest earthquake in the world today was an M 5.7 in the region of the northern Ryukyu Islands, Japan. NEIC reported it was felt with intensity II-III in Kaogshima, Japan at Kagoshima, Kanoya and Naze and in Shizuoka at Hamamatsu. It is likely that this earthquake was promoted by energy associated with Tropical Storm Bebinca which is currently passing near this epicenter as noted in this and previous issues of this summary:

 

"Tropical Storm Bebinca (Depression 14W) continued today west northern Mariana Islands with winds up to 50 kts. It is expected to track to the north and west becoming a Typhoon as it passes over the Ryukyu Island, Japan around September 15. Enhancement of seismicity in southern Japan and Guam is likely with this storm in the next week." (September 11-14, 2024)

 

and

 

"Typhoon Bebinca (Depression 14W) continued today over the northern Ryukyu Islands, Japan. It is expected to track to the north and west a Typhoon as it passes over the Ryukyu Island, Japan around September 15. Enhancement of seismicity in southern Japan and Guam is likely with this storm in the next week.: (September 14, 2024)

 

This earthquake of M 5.7 in the Ryukyu Islands is the strongest within about 200 km of this epicenter since an M 5.9 on April 15, 2024. At the time this summary noted:

 

"The strongest earthquake in the world today was an M 5.9 in the Ryukyu Islands of Japan. NEIC reported it was felt with intensity up to IV in Koshima, Japan. It is the strongest in the northern Ryukyu Islands within about 200 km of this epicenter since an M 6.1 on December 9, 2021. At the time this summary noted:

 

"The strongest earthquake in the world today was an M 6.0 in the northern Ryukyu Islands, Japan. NEIC reported maximum shaking with this event of VI in Nago, Okinawa with IV in Naha, Okinawa and in Kagoshima at Naze, Nishinoomote and lesser shaking in Ibusuki and Kanoya, Kagoshima and in Hirara, Okinawa, Japan.

The last earthquake of M>=6 within about 150 km of this epicenter in the Ryukyu Islands was an M 6.7 on November 13, 2015. An M 6.6 and an M 6.1 about 150 km to the west of this occurred at intermediate depths on June 13, 2020 and July 13, 2019 but because of their depths are not considered possible foreshocks." (December 9, 2021, April 15, 2024)

 

 

Forecast 116215 had expected this event in this region was likely around September 13, 2024.

 

O: 13SEP2024 23:03:41  29.8N  130.9E MW=5.7  EMSC   RYUKYU ISLANDS, JAPAN         

P: 13SEP2024 116215    30.0N  129.0E 3.5-4.9 AABAA  Kyushu, Japan area         

 

A light M 3.4 earthquake was widely felt in the area of Central California near San Francisco, California today continuing the enhanced seismicity in California in early September. NEIC reported this earthquake was felt with intensity II-IV in the San Francisco Bay area f California in Los Altos, Menlo Park, Belmont, Burlingame, Half Moon Bay, Daly City, Salinas, and in Nevada. Some concern has been expressed that recent earthquakes in California point to stresses that could trigger a major or strong regional event at this time. This summary has been clear on many occasions on this possibility beginning with the January 1, 2024 issue. The coincidence of moderate earthquake in mid-August and mid-September, 2024 near Los Angeles with the past two major geomagnetic storms suggests that such an event is most likely when the current X-class solar flare producers return to earth-effective positions on the sun in mid-October, a time when seismicity frequently sees peaks is regional activity in California.

 

Forecasts 116205 had expected enhanced seismicity in the region of San Francisco was likely around September 13-17, 2024.

 

O: 13SEP2024 22:15:47  37.4N  121.8W ML=3.4  ANSS   SAN FRANCISCO BAY AREA, CALIF.

O: 13SEP2024 22:15:47  37.4N  121.8W ML=3.1  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 13SEP2024 116205    37.1N  121.5W 2.5-4.8 AAAAA  Central California         

P: 17SEP2024 116205    37.3N  121.6W 2.5-4.6 BAAAA  Central California         

 

 

 

MODERATE QUAKE SHAKES LOS ANGELES WITH GEOMAGNETIC STORM

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 12, 2024

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in the region of Los Angeles, California. NEIC received nearly 20,000 felt reports from residents of Southern California. These included reports of intensity V in Malibu, Agoura Hills, Westlake Village, Thousand Oaks, and IV in Calabasas, Oak Park, Newbury Park, West Hills, Woodland Hills, Camarillo, Canoga Park, Simi Valley, Winnetka, Tarzamna, Santa Monica, Moorpark, Santa Monica, Encino, Reseda, Northridge, Los Angeles, Sherman Oaks, Van Nuys, Somis, Marina del Rey, Beverly Hills, Studio City, Valley Village, North Hollywood, Universal City, Hermosa Beach among others. Intensity III was felt as far as 150 km from the epicenter in places such as San Bernardino and Camp Pendleton, California with II shaking as far as 600 km from the epicenter in Arizona, Nevada, Oregon and Colorado among others. The last earthquake in the Los Angeles with M>=4.7 within about 100 km of today's M 4.7 epicenter occurred as an M 5.1 on August 20, 2023 and prior to that an M 5.1 on March 29, 2014 and M 4.7 on May 18, 2009, the last such event in the Simi Valley near Los Angeles.

 

Light aftershocks, including an M 3.4 were felt with intensity up to IV in Southern California in Malibu, Agoura Hills, Westlake Village, Calabasas, Oak Park, Thousand Oaks, Newbury Park, Woodland Hills, Camarillo, Simi Valley, Northridge, Los Angeles and as far as 200 km from the epicenter in Ludlow and San Diego. NEIC reported an earthquake of M 2.9 in Southern California was felt with intensity up to III in the area(s) of Southern California in Del Mar.

 

The last earthquake near today's epicenter with M>=4.5 was an M 4.6 on February 9, 2024. At the time this summary noted:

 

"The moderate earthquake of M 4.6-4.7 was widely felt in the region of Los Angeles, California today. Press reports indicate it was felt by more than a million residents in the area of western Los Angeles and the San Fernando Valley to Malibu, California with maximum intensity up to V in Los Angeles. EMSC reported very strong shaking in Los Angeles, California at Westlake Village, Agoura Hills, Thousand Oaks, Oak Park, Casa Conejo, Newbury Park, Calabasas, Moorpark, Camarillo, Simi Valley, Woodland Hills, Canoga Park, Winnetka, Chatsworth, Northridge, Reseda, Tarzana, Chatsworth and as far as Dana Point, Loma Linda, Hesperia, and in Winterhaven and Yuma, Arizona. Many smaller aftershocks were felt in the same area.  Minor damage was reported in Los Angeles. This included some minor damage to structures and the temporary closure of regional theme parks such as Disneyland rides.

 

This was the strongest earthquake in the Los Angeles, CA area since an M  5.1 on August 20, 2023 and an M 5.3 on April 5, 2018 and is near the epicenter of the Northridge earthquake of M 6.7 of January 17, 1994 and the M 6.8 in San Fernando Valley of February 9, 1971. Active seismicity in this region at this time was first proposed in this summary following the M 6.3 earthquake in New Guinea of December 31, 2023 as:

 

 

"The strongest earthquake of the day was an M 6.3 in the region of West Irian, New Guinea. NEIC reported it was felt with intensity up to VI in the epicentral area near Abepura, Indonesia.

...

 

Strong earthquakes in the  region of Papua, Indonesia can precede enhanced seismicity in Southern California by about a month at a distance of 103 degrees on the earth's surface. A typical example was the M 8.1 in this area on January 10, 1971 followed by the M 6.7 San Fernando earthquake in Los Angeles of February 9, 1971. A similar example occurred in October, 1979 when the Superstition Hills quake in southern California followed a major quake in this area of New Guinea." (December 31, 2023)

 

Since that time this summary has expanded this watch following the M 7.1 in

Xinjiang, China of January 22, 2024. Since that event significant earthquakes have been recorded near 103 degrees from that epicenter in Vanuatu, Florida, Oklahoma,  Melbourne, Australia, the Central Atlantic, and Hawaii among others. This was expected in the issue of January 22, 2024 as:

 

 

"Areas most likely to see enhanced seismicity at distance from today's event in China lie near 103 and 144 degrees from that epicenter and include at 103 degrees Central California, Oklahoma, Hawaii ..." (January 22, 2024)

 

and has been emphasized in many more recent summaries. Today's event follows a series of light regional earthquakes which have put residents on notice that a stronger earthquake may be imminent. For example on January 25, 2024 an M 4.2 shook eastern Los Angeles and was described in part in this summary as:

 

"A moderate earthquake of M 4.2 was widely felt with some minor damage and strong shaking in the region of Southern California near San Bernardino today. NEIC reported maximum shaking in San Bernardino with intensity up to V. EMSC reported moderate to strong shaking in Southern California was felt in San Bernardino, Colton, Loma Linda, Rialto, Riverside, Fontana, Highland, Redlands, Jurupa Valley, Moreno Valley, Rancho Cucamonga, Mentone, Mira Loma, Ontario, Yucaipa, Norco among others. This continues a series of moderate earthquakes that began with the arrival of the year 2024 and has included most recently an M 4.3 on August 29, 2018 and a similar event of 4.2 on January 5, 2024. At the time this summary noted:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.2-4.4 in the region of eastern Los Angeles, California. NEIC reported this earthquake of M 4.2 in Los Angeles, California was felt with intensity up to V in the area(s) of Los Angeles, California in Lytle Creek. EMSC reported moderate to strong shaking in the region of Los Angeles was felt in Fontana, Phelan, Rancho Cucamonga, Pinon Hills, Muscoy, Rialto, Crestline, Upland, Bloomington, Hesperia, Rialto, San Bernardino, Colton, Mountain View Acres, Glen Avon, Lake Arrowhead, Ontario, Glen Avon, Montclair, Highland and as far as Hollywood, Torrance nearly 100 km from the epicenter. This event follows a similar M 4.2 in the Rancho Palos Verdes area of California. This was noted in this summary on January 1, 2024 as:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.1 in southern California south of Los Angeles. NEIC reported it was felt with intensity III in Rancho Palos Verdes, California. EMSC reported moderate to strong shaking without damage in California at San Pedro, Rancho Palos Verdes, Rolling Hills, Long Beach, Lomita, Seal Beach, West Carson, Signal Hill, Torrance, Rossmoor, Huntington Beach, Redondo Beach, Fountain Valley, Compton, Costa Mesa, Hawaiian Gardens, Westminster, Hermosa Beach among others. The only earthquakes with equal or larger magnitude than M 4.1  located within about 50 km of this epicenter in the past 35 years occurred on September 18, 2021 (M 4.3) and as an M 4.0 on May 15, 2013." (January 25, 2024)

 

Today's epicenter in Los Angeles, California is located at 103 degrees from the

Xinjiang, China epicenter of January 22, 2024 and was probably promoted by  energy from that source. It occurred near local solar noon at the time of the new moon as noted in previous summaries:

 

"The new moon will arrive on February 9, 2024 at 22:59 UT.  Longitudes which are at local solar midnight at this time are located at about 15 East while those at local solar noon are near 165 West. In the east these include most of western Europe and Iceland while in the west areas of the western Aleutians, Alaska, Hawaii, Tonga/Fiji/New Zealand and portions of the Pacific-Antarctic Ridge are included. These are the most likely areas to see significant tidal triggering with this new moon. Other areas may also see tidal promotion in the next week especially at times of large solar flares and near local solar midnight and solar noon. The likelihood of a strong associated earthquake with this full moon are considered  moderate high in the next week (February 4-14, 2024).

 

Tidal stresses were probably important in the timing of today's California earthquake. Minor damage was reported in Los Angeles. This included some minor damage to structures and the temporary closure of regional theme parks such as

Disneyland rides." (February 10, 2024)

 

It may also be noted that today's earthquake in Los Angeles coincided with landfall of Hurricane Francine in Louisiana and Tropical Storm Ileana in Baja California just as the event of August 20, 2023 coincided with the landfall of Hurricane Hilary in California. Data for TS Ileana from NHC follows:

 

TROPICAL STORM ILEANA  (09E) 

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TS    ILEANA   2024-09-13  00:00 UT  21.2N  108.7W   50 kts  Baja, Gulf of California

 

Tropical Storm Ileana  (Depression 09E) formed today in the southern Gulf of California with winds up to 50 kts. It is expected to track to the north and west and may affect regional seismicity as far to the north as southern California as it passes through the area.

 

 

It also followed a series of lighter earthquakes in the area which were noted in this summary as possible precursors to such an event as today's as:

 

 

"A series of light earthquakes - including two of M 3.0 occurred south of Los Angeles in the Channel Islands today. NEIC reported these earthquakes of M 3.1 and M 2.9 South of Los Angeles, California  were felt with intensity up to IV in the area(s) of Los Angeles, California in Palos Verdes, Long Beach, Cypress, Costa Mesa and Oxnard.  The area at this time appears to be somewhat unstable and stronger earthquakes in the area and in the Los Angeles area are expected in the next week.

 

Forecast 165958 had expected today's events were likely around September 2.

These earthquakes are located at 103-105 degrees from recent strong quakes

in Mindanao, Philippines and from Tajikistan and Taiwan and may have been promoted by energy from those sources." (September 3, 2024)

 

Today's earthquake in Los Angeles coincided with the peak (KP 7) of the strongest geomagnetic storm (AP 67) since the AP index reached 273 on May 11, 2024 and 122 a month ago on August 12, 2024 (AP 122) and may have been additionally promoted at this time by this disturbance.

 

It is also noteworthy that today's event occurred with the second strongest solar flare of the past week - an M6.8 which began within several minutes of 14:28 UT - the same time as the event in Los Angeles occurred. Both followed an X1.3 flare which occurred when Los Angeles was at local solar midnight several hours earlier. This event in California was likely triggered by Solar Flare Effects and by plate tectonic movements related to the landfall of Hurricane Francine. Flare Date from SWPC for these follows:

 

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

1110       0931   0943      0951   X1.3      (September 12, 2024)   7.6E-02  

South Island, NZ, M 4.1 09:45 UT

Michoacan M 5.0 09:48 UT

 

1260       1429   1443      1447   M6.8      (September 12, 2024)   2.1E-02  

Los Angeles M 4.7 14:29 UT

 

Hurricane Francine was reported as:

 

"Tropical Storm Francine made landfall today in southern Louisiana with winds up to 90 kts (category 1 Hurricane). It is expected to track to the north and east. Regional seismicitiy in the New Madrid and Mississippi Valley up to Missouri will likely be enhanced by this hurricane in the next several days." (September 12, 2024)

 

Forecasts 165958 and 116238 had expected today's activity in Los Angeles was likely within about 25 km of today's epicenter around September 9-12, 2024.

 

 

O: 12SEP2024 14:28:21  34.0N  118.8W Mw=4.7  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 12SEP2024 14:32:05  34.0N  118.8W ML=2.0  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 12SEP2024 16:24:04  34.0N  118.8W ML=2.2  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 12SEP2024 14:31:24  34.1N  118.8W ML=2.5  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 12SEP2024 14:42:49  34.1N  118.8W ML=2.1  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 12SEP2024 15:40:49  34.1N  118.8W ML=3.3  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 12SEP2024 16:15:32  34.1N  118.8W ML=2.6  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 12SEP2024 16:37:32  34.1N  118.8W ML=3.3  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 12SEP2024 16:50:37  34.1N  118.8W ML=2.1  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 12SEP2024 17:18:07  34.1N  118.8W ML=2.2  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 12SEP2024 19:01:01  34.1N  118.8W ML=2.3  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 12SEP2024 14:03:03  33.7N  118.0W ML=2.3  EMSC   GREATER LOS ANGELES AREA, CALI

P:  9SEP2024 165958    33.9N  118.3W 2.5-4.7 BAAAA  So. California             

P: 12SEP2024 116238    34.3N  118.5W 2.5-4.6 AAAAA  So. California             

 

 

The largest earthquake in the world today was an M 5.2 in the Izu Islands, Japan about 500 km south of Tokyo. It was not reported felt in this area. An M 6.1 hit the region within about 100 km of today's event on October 6, 2023. At the time this summary noted:

 

 

"Strong seismicity continued today in the region of the Izu Islands today and included the largest event in the world today. NEIC reported this earthquake of M 6.1 in the Izu Islands, Japan was felt with intensity II-III in the area(s) of the Izu Islands, Japan in Kanagawa.  This continues the extensive and powerful swarm in the Izu Islands which began several days ago." (October 6, 2023)

 

Earthquakes in this region of the Izu Islands often occur as swarms often lasting for several weeks and further and perhaps stronger earthquakes in the Izu Islands should be expected in the next two weeks.

 

Forecast 116225 had expected today's M 5.2 in the Izu Islands was likely around September 13 within about 100 km.

 

O: 12SEP2024 23:48:14  31.0N  141.3E MB=5.2  EMSC   IZU ISLANDS, JAPAN REGION    

P: 13SEP2024 116225    31.0N  140.0E 4.0-5.4 AAAAA  Off East Coast Honshu      

 

STRONG EARTHQUAKE IN BISMARCK SEA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 11, 2024

 

 

The strongest earthquake in the world today was an M 6.3 in the Bismarck Sea, Papua New Guinea. NEIC reported it was felt with moderate intensity in New Guinea at Madang (VI) and in Lorengau Manus. This event lies near the longitude of maximum tidal stresses with the new and full moons of September and may have been promoted by energy from tidal stresses. This summary noted this in earlier issues as:

 

"The New Moon  arrived at 01:55 UT on September 3, 2024. Longitudes which will be at local solar midnight at this time are near 30 West while those at local solar noon are near 150 East. These zones include the central Atlantic and Iceland and western Europe in the west and the Kuril Islands, Japan and portions of eastern Indonesia and the Vanuatu Islands in the east. These areas are the most likely to see tidal triggering in the next week. Such events often occur near local solar midnight and noon. A major earthquake is considered likely with this new moon in the 10 days." (September 1-6, 2024)

 

A similar M 6.3 hit the Bismarck Sea near today's epicenter on May 9, 2022. At the time this summary noted:

 

"The strongest earthquake in the world today was an M 6.3 in the Bismarck Sea, Papua New Guinea. NEIC reported it was felt with intensity VII in Madang, Papua and II in Lorengau Manus, Papua New Guinea. This continues enhanced regional seismicity in this area which has included an M 6.0 on April 28, 2022. At the time this summary noted in this regard:

 

"The strongest earthquake in the world today was an M 6.0 in Papua New Guinea. It was not reported felt in this area. This epicenter is located near the geomagnetic equator and may have been promoted by the geomagnetic storm currently in progress as noted in this and previous summaries:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 14. High latitudes also saw active conditions with AP 21. This is sufficient to activate higher levels of seismicity at high latitudes and near the geomagnetic equator in the next several days." (April 28, 2022) 

 

The last earthquake with M>=6 within eastern New Guinea and within about 200 km of today's epicenter was an M  6.0 on July 21, 2021 and an M 6.1 on April 27, 2021, one year ago." (April 29, 2022, May 9, 2022)

 

Forecast 116134 had expected today's event was likely within about 50 km around

September 11, 2024.

 

O: 11SEP2024 16:46:05   3.3S  146.4E MW=6.3  EMSC   BISMARCK SEA                 

P: 11SEP2024 116134     3.0S  147.0E 4.0-5.7 AAAAA  New Ireland                

 

A series of moderate to moderately strong earthquakes hit central Vanuatu today and may have been associated with a volcanic eruption. This series which included two events of M 5.8 among others was not reported felt in the epicentral area of central Vanuatu. These were closely associated with a series of M-class solar flares.

 

The last earthquake within about 200 km of today's epicenters in Vanuatu with M>=5.8  occurred on July 22, 2024 near the same epicenter as today's activity which is probably aftershock of that event and on May 8, 2024 with M 6.1. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 6.7 in central Vanuatu.

This is the strongest earthquake within about 200 km of this epicenter in Vanuatu since an M 7.0 on January 8, 2023." (November 22, 2023, May 8, 2024)

 

Forecast 116352 had expected today's activity in Vanuatu was likely around September 11-15, 2024 within 100 km of today's activity.

 

O: 11SEP2024 18:46:56  15.2S  168.0E mb=5.1  EMSC   VANUATU

O: 11SEP2024 21:22:53  15.2S  168.3E mb=4.5  EMSC   VANUATU

O: 11SEP2024 19:22:55  15.3S  168.1E Mw=5.8  EMSC   VANUATU

O: 11SEP2024 19:52:24  15.3S  168.1E mb=4.9  EMSC   VANUATU

O: 11SEP2024 20:36:24  15.3S  168.2E mb=4.9  EMSC   VANUATU

O: 11SEP2024 20:44:48  15.3S  168.5E mb=4.5  EMSC   VANUATU

O: 11SEP2024 18:18:02  15.2S  168.1E MW=5.8  EMSC   VANUATU                      

P: 11SEP2024 116352    15.0S  167.0E 4.0-5.9 AAAAA  Vanuatu Islands            

P: 15SEP2024 116352    16.0S  168.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

 

An X1.3 class solar flare occurred on September 12, 2024. A strong M5.6 solar flare also occurred near UT midnight today. This flare occurred near local solar noon in Vanuatu where a series of strong quakes occurred today. A moderately strong solar flare of about M3.6 also occurred shortly after 06:00 UT today. It was followed by a series of moderate earthquakes in the Red Sea of M 4.5-5.0 beginning at 06:20 UT and continuing to local solar noon. SWPC reported these flares with  parameters listed in the “FLARE” section of this report. The X-class flare is likely to promote unusual and strong earthquakes in  the next three days. This enhanced solar flare activity is due to a series of strong sunspots rotating back to a geo-effective position after their last arrival with X-flares and strong geomagnetic storms starting near August 12, 2024. Some of the most notable activity with these August events included a moderate earthquake in Los Angeles, California and if the area is still sensitive a recurrence of that activity is possible at this time and in mid-October.

 

A moderate earthquake also occurred today in the region of Pakistan with M 5.4.

NEIC reported this earthquake of M 5.4 in Pakistan was felt with intensity up to IV in the area(s) of Pakistan in Punjab at Faisalabad, IV in Ahmadpur Sial and Dera Ismail Khan Nort-west Frontier and in Peshawar with lesser shaking within about 350 km of the epicenter in Punjab at Gujranwala, Bahawalpur, Chichawatni, Jhang and in Islamabad. EMSC reported moderate shaking in Pakistan at Multan, Mandi Bahauddin, Nowshera, Gujranwala, Rawalpindi, Lahore, Islamabad, Kahna Nau, Kabul, Afghanista and in India at Derabassi, Sector, and Noida. The last earthquake of greater magnitude in Pakistan was an M 5.9 on October 6, 2021. At the time this summary noted:

 

 

"Today's M 5.9 is the strongest earthquake in Pakistan within about 250 km of this epicenter since an M 6.4 on October 28 and again on October 29, 2008." (October 6, 2021)

 

Forecast 116229 had expected enhanced seismicity in southern Pakistan was likely in mid-September.

 

O: 11SEP2024 07:28:00  31.3N   70.6E MB=5.4  EMSC   PAKISTAN                      

P: 16SEP2024 116229    33.0N   74.0E 3.8-5.2 BBCAA  Pakistan                   

 

 

 

MODERATELY STRONG QUAKE SHAKES SOUTH SANDWICH ISLANDS

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 10, 2024

 

 

A moderately strong earthquake of M 5.7 occurred in the area of the South Sandwich Islands today. It was not reported felt in this remote area. It was probably triggered by an M1.0 class solar flare which peaked within a minute of the occurrence of this earthquake near local solar midnight by SFE. The mainshock was preceded by a series of moderate foreshocks including events of M 5.0, 5.0, 5.0, 4.7 and 4.9. The last earthquake of equal or greater magnitude than M 5.7 in the South Sandwich Islands occurred about 100 km southeast of today's epicenter on June 19, 2024. At the time this summary noted:

 

"While the South Sandwich Islands have been active in May and June, 2024 today's event of M 5.7 is the strongest in the region since a similar M 5.7 on February 14, 2024. The last such earthquake in the South Sandwich Islands of larger magnitude was an M 5.8 on November 30, 2023. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 5.8 in the South Sandwich Islands. This event was not reported felt in this remote area. A major earthquake of M 7.5 hit about 200 km southeast of today's epicenter on August 12, 2021 but the last earthquake within this range of today's event with equal of larger magnitude was recorded on August 18 and December 7, 2021 with M 5.8-5.9. Today's event was probably promoted by geomagnetic effects which maximize near the geomagnetic equator and at high latitudes." (November 30, 2023, June 20, 2024)

 

Forecast 116383 had expected today's activity in the South Sandwich Islands

within about 25 km of these epicenters was likely around September 11.

 

O: 10SEP2024 21:39:13  55.8S   26.1W mb=5.0  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 10SEP2024 21:48:45  55.8S   26.2W mb=4.9  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 10SEP2024 22:01:21  55.8S   26.2W mb=5.0  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 10SEP2024 23:57:22  55.8S   26.2W mb=5.0  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 10SEP2024 21:18:57  55.9S   26.2W mb=5.0  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 10SEP2024 23:50:39  55.9S   26.1W mb=5.7  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 10SEP2024 18:02:13  55.8S   26.1W MB=4.7  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 11SEP2024 116383    56.0S   26.0W 4.0-5.8 AAAAA  So. Sandwich Islands       

 

An M 4.7 also occurred today at the northern end of the Atlantic Ocean. This event in the Reykjanes Ridge is likely related to current and recent activity

in Iceland and moderate earthquakes south of this which included an M 5.6 and an M 5.5 on September 5 and August 30, 2024 about 750 km south of this epicenter. The last earthquake within about 200 km of today's epicenter with M>=4.7  however was an M 5.1 on August 21, 2022.

 

Forecast 166035 had expected today's activity in this region was likely in  early September, 2024.

 

O: 10SEP2024 20:10:41  59.4N   30.8W MB=4.7  EMSC   REYKJANES RIDGE              

P:  1SEP2024 166035    59.0N   30.0W 4.0-5.9 CAAAA  North Mid-Atlantic Ridge   

P:  5SEP2024 166035    58.0N   32.0W 4.0-5.8 BBAAA  North Mid-Atlantic Ridge   

 

An earthquake of M 3.8 occurred today in the North Atlantic region near Bermuda. It was not reported felt. The last earthquake within about 200 km of this epicenter with M>=3.8 via NEIC data occurred on April 30, 2019. At the time this summary noted:

 

"An unusual earthquake of M 4.6 north of the Virgin Islands in the North Atlantic Ocean occurred today, This may be an outer rise earthquake preceding moderate to strong activity in the northeastern Caribbean including the Virgin Islands an Puerto Rico. Outer rise earthquakes occur when a subducting plate buckles due to an obstruction in the subduction zone. When the obstruction is overcome, a moderate to strong earthquake can occur. Today's event is the first in the region since an M 4.6 on February 28, 2016. The last of larger magnitude was an M 5.8 on July 29, 2006 followed by an aftershock of M 4.9 on September 22, 2006." (April 30, 2019)

 

Forecast 116178 had expected today's event within about 10 km was likely around September 11.

 

O: 10SEP2024 13:42:37  23.0N   64.0W ML=3.8  EMSC   NORTH ATLANTIC OCEAN         

P: 11SEP2024 116178    23.0N   64.0W 3.0-4.6 AAAAA  Bahamas/No. Caribbean      

 

A relatively large earthquake of M 3.8-4.2 occurred in the Canary Islands of Spain today. EMSC reported this earthquake of M 3.8 in the Canary Islands, Spain was felt with intensity up to IV in the area(s) of the Canary Islands, Spain at Moya, Arucas, Teror, Valleseco, Las Palmas de Gran Canaria, San Bartolome de Tirajana. Web based reports indicate that NGI (Spain's National Geographic Institute) gave this event initially an M 4.2, the strongest in Gran Canaria in the past 60 years. This earthquake occurred as a storm system was moving through the Canary Islands area and may have been promoted by stresses associated with this ocean storm. This storm had been noted in this summary as:

 

"Storm systems in the Atlantic at 15N 29W (in the Canary Islands region) and 15N 44W are expected to track to the west leading to possibly increased seismicity in the Caribbean next week." (September 10-11, 2024)

 

O: 10SEP2024 18:20:30  28.2N   15.6W ML=3.8  EMSC   CANARY ISLANDS, SPAIN REGION 

 

 

An earthquake of M 4.5 occurred today in the area of Guam. NEIC reported it was felt with intensity III in Guam at Tamuning and Yigo. This earthquake was probably promoted by the passage of Tropical Depression 14W today over this epicenter as noted in the previous issue of this summary:

 

"Tropical Depression 14W formed today east of Guam with winds up to 40 kts. It is expected to track to the north and west becoming a Typhoon as it passes over the Ryukyu Island, Japan around September 15. Enhancement of seismicity in southern Japan and Guam is likely with this storm in the next week.

 

 

 

MODERATE QUAKE IN TALAUD ISLANDS, INDONESIA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 9, 2024

 

 

An M 5.4 occurred south of Mindanao, Philippines today in the Talaud Islands. NEIC reported strong shaking with intensity up to VII in Alabel Southern Mindanao, Philippines. EMSC reported slight movement in Davao City, Philippines.

BMG reported intensity III in Talaud at Lirung, Beo, Rainis, Essang, Nanusa, Kabaruan, Melonguane, Gemeh, Damau, Salibau, Kalongan, Pulutan, with intensity II in Sangihe, Siau and Pulau. This is the strongest earthquake in the Talaud Islands since an M 5.7 on June 15, 2024 but the last event within about 100 km of today's event occurred as an M 5.8 on June 12, 2024. At the time this summary noted:

 

 

“The strongest earthquake in the world today was an M 5.8 in Halmahera south of the Philippines. NEIC reported it was felt with intensity up to V in Sarangani, Philippines. EMSC reported moderate shaking in Davao City, Philippines. PHIVOLCS reported it with MS 5.7 and intensity I in Don Marcelino, Davao, Occidental with lesser shaking in Sarangani, Davao del Sur and South Cotabato. BMG reported it with M 6.0 and with light intensity in the epicentral area. Today's earthquake occurred near local solar midnight and may have been promoted by strong geomagnetic or tidal stresses which maximize near this hour. The last earthquake in the area of Halmahera or Talaud with M>=5.8 was an  M 6.6 on April 9, 2024. At the time this summary noted in this regard:

 

"The strongest earthquake in the world today was an M 6.6 in Talaud, Indonesia. NEIC reported it was felt with intensity up to IV in Tobelo, Indonesia. PHIVOLCS  reported this earthquake of M  6.5 in Talaud, Indonesia was felt with intensity up to II in the area(s) of   Saranagani, City of Davao at Malungon and Glan.

BMG reported intensity IV in Ibu, Halmahera, Barat, Maluu; III in Kat Sangihe, Talaud, Siau, Halmeahera, Pulau Morotai, Tidore and Ternate among others,

This is the strongest earthquake in the Molucca Sea and Talaud within about 200 km of this epicenter since an M 7.0 on January 18, 2023 and may be an aftershock of that event." (April 10, 2024, June 12, 2024)

 

Forecast 165839 had expected today's earthquake within about 50 km was likely around September 9.

 

O:  9SEP2024 21:01:32   4.4N  126.7E MB=5.4  EMSC   KEPULAUAN TALAUD, INDONESIA  

P:  9SEP2024 165839     5.0N  127.0E 4.0-5.4 AAAAA  Halmahera                  

 

The strongest earthquake in the world today was an M 5.5 in the Central East Pacific Rise. It was not reported felt in this remote area. This is the strongest earthquake within about 250 km of this epicenter to occur since an M 5.5 on December 2, 2020.

 

Forecast 116136 had expected this event within about 250 km was likely in mid-September.

 

 

O:  9SEP2024 17:37:11   6.1S  107.0W MW=5.5  EMSC   CENTRAL EAST PACIFIC RISE    

P: 19SEP2024 116136     5.0S  105.0W 4.0-5.6 CBBAA  No. East Pacific Rise      

 

 

SEISMICITY UP IN VANCOUVER ISLAND AREA, B.C., CANADA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 8, 2024

 

Several earthquakes of M 3.3 and M 3.5 occurred near Vancouver, B.C., Canada

today. This occurred near local noon and may have been promoted by strong

tidal stresses which maximize near this hour. This area has been relatively quiet in recent weeks but can become active, especially in conjunction with strong east coast ocean storms making slopefall or landfall. As the Atlantic Hurricane season becomes active watch for a moderate to strong earthquake in this area of the western North American subduction zone.

 

Forecast 166026 had expected today's activity within about 50 km was likely

around September 5.

 

 

O:  7SEP2024 22:54:33  51.0N  130.7W MB=3.3  ECAN OF PORT HARDY, BC              

O:  7SEP2024 22:30:03  51.0N  130.7W MB=3.5  ECAN OF PORT HARDY, BC              

P:  5SEP2024 166026    50.6N  130.5W 3.0-4.9 AAAAA  British Colombia           

 

Aftershocks also continued in the Channel Islands region south of Los Angeles,

California today including an M 2.2. In the previous issue of this summary it was noted as:

 

"A series of light earthquakes occurred today in the region of Los Angeles, California. The largest of these of M 3.9-4.2 were reported by NEIC to have been felt with intensity up to V in Montclair; IV in Ontario, Mira Loma, Ontario, Chino, Rancho Cucamonga, Upland, Fontana, Norco, Corona, Riverside, Los Angeles and in general within about 100 km of the epicenter and as far as San Diego (about 140 km ) and Oakland (about 600 km from the epicenter). The last earthquake in the Los Angeles area within about 100 km of these epicenters occurred on August 12, 2024 with M 4.4 and prior to that as an M 4.1 on May 1, 2024, At that time this summary noted:

 

 

"An M 4.1 earthquake hit the region of Los Angeles California today. NEIC reported it was felt with intensity up to V in Corona, California. EMSC reported moderate shaking with a loud earthquake noise was witnessed in the Los Angeles area at Irvine, Trabuco Canyon, Orange, Lake Forest, Corona, Mission Viejo, Anaheim, Tustin, Yorba Linda, Santa Ana, and as far as the Simi Valley in Northridge, Sylmar, Encino among others. Aftershocks of M 2.5 were reported with intensity IV in Corona, and Orange California. A witness reported unusual shaking instead of normal "rolling" with the quake. This is the strongest earthquake in eastern Los Angeles within about 75 km of today's epicenter since an M 4.2 on January 5, 2024 and again on January 25, 2024. (May 1, 2024, September 8, 2024)

 

Forecast 165957 had expected today's activity within about 25 km of today's epicenters was likely around September 8, 2024.

 

O:  8SEP2024 21:45:07  33.7N  118.6W ML=2.2  EMSC   CHANNEL ISLANDS REG., CALIFORN

P:  9SEP2024 165958    33.9N  118.3W 2.5-4.7 AAAAA  So. California             

 

A series of light earthquakes occurred today north of San Francisco following yesterday's series in Los Angeles, California. The larger event in today's series were reported by NEIC to have been felt with intensity IV in Guerneville and II-III in Calistoga, Santa Rosa, Cazadero, Windsor, Healdsburg, Jenner, California.

 

An unusual earthquake of M 5.0 occurred today in the Mid-Indian Ridge. The last event within about 250 km of this epicenter with M>=5 occurred on June 14, 2020 with M 5.0. Today's event is located at 103 degrees from the last major earthquake in the world – an M 6.9 in Tonga on August 25, 2024 and may have been promoted by energy from that source. It occurred near local solar noon and may have been promoted by strong tidal stresses which maximize near this hour. A similar M 5.0 in the South Sandwich Islands occurred in the South Sandwich Islands today. This epicenter in the Indian Ocean is antipodal to the Southern Gulf of California where a tropical  Storm (Ileana) is currently forming and may  as described in the updates section of this summary:

 

"Tropical Storm Ileana  (Depression 09E) formed today in the southern Gulf of California with winds up to 50 kts. It is expected to track to the north and west and may affect regional seismicity as far to the north as southern California as it passes through the area.: (September 9, 2024)

 

O:  9SEP2024 06:08:47  22.7S   69.3E MB=5.0  EMSC   MID-INDIAN RIDGE             

 

 

ENHANCED SEISMICITY CONTINUES NEAR LOS ANGELES, CALIFORNIA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 7, 2024

 

 

A series of light earthquakes occurred today in the region of Los Angeles,  California. The largest of these of M 3.9-4.2 were reported by NEIC to have been felt with intensity up to V in Montclair; IV in Ontario, Mira Loma, Ontario, Chino, Rancho Cucamonga, Upland, Fontana, Norco, Corona, Riverside, Los Angeles and in general within about 100 km of the epicenter and as far as San Diego (abou 140 km ) and Oakland (about 600 km from the epicenter). The last earthquake in the Los Angeles area within about 100 km of these epicenters

occurred on August 12, 2024 with M 4.4 and prior to that as an M 4.1 on May 1, 2024, At that time this summary noted:

 

 

"An M 4.1 earthquake hit the region of Los Angeles California today. NEIC reported it was felt with intensity up to V in Corona, California. EMSC reported moderate shaking with a loud earthquake noise was witnessed in the Los Angeles area at Irvine, Trabuco Canyon, Orange, Lake Forest, Corona, Mission Viejo, Anaheim, Tustin, Yorba Linda, Santa Ana, and as far as the Simi Valley in Northridge, Sylmar, Encino among others. Aftershocks of M 2.5 were reported with intensity IV in Corona, and Orange California. A witness reported unusual shaking instead of normal "rolling" with the quake. This is the strongest earthquake in eastern Los Angeles within about 75 km of today's epicenter since an M 4.2 on January 5, 2024 and again on January 25, 2024. (May 1, 2024)

 

Forecast 165957 had expected today's activity within about 25 km of today's epicenters was likely around September 8, 2024.

 

O: 07SEP2024 17:06:26  34.0N  117.6W ML=2.3  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 07SEP2024 17:34:20  34.0N  117.6W Mw=3.9  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 07SEP2024 17:43:06  34.0N  117.6W ML=2.1  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 07SEP2024 17:47:35  34.0N  117.6W ML=2.1  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 07SEP2024 18:43:16  34.0N  117.6W ML=2.2  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 07SEP2024 18:45:53  34.0N  117.6W ML=2.5  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 08SEP2024 01:36:57  34.0N  117.6W ML=2.0  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 08SEP2024 01:38:59  34.3N  117.0W ML=2.4  EMSC   SOUTHERN CALIFORNIA

O:  7SEP2024 17:05:45  34.0N  117.6W ML=3.4  EMSC   GREATER LOS ANGELES AREA, CALI

P:  8SEP2024 165957    33.8N  117.7W 2.5-4.6 AAAAA  So. California             

 

 

The earthquakes in Southern California followed shortly after an M 4.3 and aftershocks in Northern California. The largest of these were felt with intensity II-III in the Geysers area of Northern California in Calistoga, Napa, Fairfield, San Francisco, Alameda, Burlingame and Palo Alto among others.

The last earthquake of M>=4.2 within about 100 km of this epicenter in the Geysers area was an M 4.5 on June 8, 2024. The only other such event in the region in the past year was an M 4.3 on January 26, 2024. At the time of the January event this event noted:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.2 in Northern California. NEIC reported it was felt with intensity up to V in the Geysers of California. EMSC reported it was felt lightly in Santa Rosa, California. The last earthquake in Northern California in the Geysers area with M>=4.2 occurred on June 3, 2023 with  M 4.5." (January 26, 2024)

 

Forecast 165926 had expected enhanced seismicity within about 10 km of today's epicenter was likely around September 7.

 

O: 07SEP2024 14:31:32  38.8N  122.7W ML=3.0  EMSC   NORTHERN CALIFORNIA

O: 07SEP2024 14:32:33  38.8N  122.8W ML=2.6  EMSC   NORTHERN CALIFORNIA

O:  7SEP2024 14:30:36  38.8N  122.7W MW=4.3  EMSC   NORTHERN CALIFORNIA          

P:  7SEP2024 165926    38.9N  122.8W 2.5-4.6 AAAAA  Central California          

 

The strongest earthquake in the world today was an M 6.0 in Tonga. NEIC reported it was felt with intensity V in Tonga at Ohonua Eua and III in Nuku'alofa, Tongatapu. This earthquake occurred within minutes of local solar noon and was probably promoted by strong tidal stresses with the new moon.

This is similar to the last earthquake of M>=6 in the region of Tonga - an M 6.9 on August 25, 2024. At the time this summary noted in this regard:

 

"The strongest earthquake in the world today was an M 6.9 followed by an M 6.2 aftershock in Tonga. These events occurred within minutes of local solar noon and were likely triggered by tidal and/or geomagnetic stresses which maximize  near this hour. NEIC reported this earthquake was felt with maximum intensity

V in Tonga at Pangai with IV in Tamakautoga, Niue, Nuku'alofa, Haveloloto, and III in Avatele, Alofi and Neiafu Vava'u Tong with slight shaking II in American Samoa. No tsunami was expected by EMSC which reported the quake was felt in Tonga at Nuku'aofa. A regional foreshock of M 4.4 was felt with intensity III in Neiafu Vava'u, Tonga half a day earlier. The last earthquake within about 250 km of today's epicenter in Tonga with M>=6.9 occurred as an M 6.9 on July 2, 2023 and prior to that on November 11 and 12, 2022 with M 7.0 and M 7.3." (August 25, 2024)

 

Forecast 166090 had expected today's event in Tonga was likely within about 100

km around September 5.

 

O:  7SEP2024 22:39:08  21.3S  173.8W MW=6.0  EMSC   TONGA                        

P:  5SEP2024 166090    21.0S  175.0W 4.0-5.6 AAAAA  Tonga Islands              

 

 

MODERATELY STRONG QUAKES SHAKE ARGENTINA AND NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 6, 2024

 

 

The strongest earthquake in the U.S. or Canada today was an M 5.7 in San Juan, Argentina. NEIC reported this event was felt with intensity up to IV in Copiapo, Atacama, Chile. This follows a similar M 5.7 in Bolivia of September 5 and, like that event, is located near the antipode of the currently location of Typhoon Yagi as noted in this summary:

 

"Typhoon YAGI (12W) continued today west of northern Luzon Philippines with winds up to 140 kts. This system is currently located at 19N 120E with winds up to 70 kts and heading to the west. Landfall in the central and northern Philippines could bring enhanced seismicity to that area of the Philippines. It is then likely to reach typhoon levels as it moves into eastern China." (September 7, 2024)

 

The event in Bolivia had been likely triggered by Typhoon Yagi as noted in the previous summary:

 

"This epicenter in Bolivia is at the exact antipode of the landfall of Typhoon

Yagi on the coast of Vietnam and China today (see WEATHER section below). Compare for antipodality landfall of Yagi at 19N 113E with this earthquake in Bolivia of M 5.7 at 19S 67W. The two events occurred simultaneously and a clear triggering effect is observable in this case." (September 6, 2024)

 

The last earthquake in San Juan, Argentina with M>=5.7 within about 200 km of today's epicenter was recorded by NEIC to have occurred on September 7, 2018 with M 5.8 (exactly six years ago). At the time this summary noted:

 

"An earthquake of M 5.8 also occurred in Central Chile today. NEIC reported it was felt with intensity IV in Vallenar and Copiapo, Atacama and in Coquimbo at Vicuna and La Serena and in Mendoza, Argentina. No major damage or casualties were reported with this earthquake but minor damage may have occurred. Like the event in Ecuador this epicenter is at 100-103 degrees from the Fiji quake and may have been triggered by energy from that event. This follows an M 5.2 in the region on August 28, 2018, a possible foreshock. It is the strongest within about 200 km of this epicenter since an M 6.9 on November 11, 2015." (September 7, 2018)

 

Forecast 166081 had expected today's event in San Juan, Argentina was likely within

about 100 km around September 7.

 

O:  6SEP2024 10:12:57  28.7S   69.4W MW=5.7  EMSC   SAN JUAN, ARGENTINA          

P:  7SEP2024 166081    28.0S   68.0W 4.0-5.4 AAAAA  Argentina                  

 

A similar event of M 5.7 was also recorded by GeoNet in New Zealand off South Island in the Snares Island area today.  GEONET reported it was felt weakly by 1 and lightly by 1 respondent in Southern South Island and in Snares Island, New Zealand. The last earthquake within about 200 km of this epicenter with M>=5.7 was recorded by NEIC to have occurred on May 31, 2023 (M 6.3) and November 24, 2018 (M 5.8). At the time of the event in May, 2023, this summary noted:

 

 

"The largest earthquake in the world today was an M 6.1-6.2 in Auckland, New Zealand. NEIC reported it was lightly felt with intensity II in New Zealand in Southland at Riverton, Invercargill and Gore. GEONET reported this earthquake in Snares Island, New Zealand was felt by 1 with 1 reporting weak intensity and 0 light intensity. This earthquake occurred new local solar noon and may have been promoted by tidal stresses which maximize near this hour. The last earthquake in the Snares Island within about 200 km of today's epicenter with larger or equal magnitude occurred on July 11, 2017 with M 6.6." (May 31, 2023)

 

"The last earthquake with M>=6.5 in the region occurred on September 30, 2007 with an M 7.4 and 6.6 ten years ago. A great earthquake hit the region December 23, 2004, two days before the great tsunamigenic Sumatra earthquake which caused more than 200,000 deaths around the Indian Ocean." (July 11, 2017) ...

 

 

The M 5.7 in the Snares Island of New Zealand was one of several unusually large earthquakes in the region today. An M 4.5 in New South Wales, Australia was accompanied by a series of minor events and events of M 5.0 also occurred  north of North Island, New Zealand and in the Kermadec Islands, New Zealand today.

 

O: 06SEP2024 11:13:32  32.3S  150.9E ML=2.5  EMSC   NEW SOUTH WALES, AUSTRALIA

O: 06SEP2024 13:56:59  32.3S  150.9E ML=2.6  EMSC   NEW SOUTH WALES, AUSTRALIA

O: 06SEP2024 20:10:18  32.4S  150.9E ML=2.5  EMSC   NEW SOUTH WALES, AUSTRALIA

O:  6SEP2024 19:58:34  32.4S  150.8E ML=4.7  EMSC   NEW SOUTH WALES, AUSTRALIA   

 

NEIC reported this earthquake of M 4.5 in New South Wales, Australia was felt with intensity up to IV in the area(s) of New South Wales, Australia at Muswellbrook (V), IV in Medowie, Forster-Tuncurry, and II-III in Kurri Kurri, Lemon Tree Passage, Nelson Bay, Lithgow, Katoomba-Wentworth Falls, Camden Haven and Bowral. EMSC reported light shaking in New South Wales at Sydney, New Castle and Muswellbrook, Australia. This activity is at 100 degrees from the M 7.1 in Xinjiang, China of January 22, 2024 and may have been promoted by energy from that source.

 

O:  7SEP2024 06:45:46  34.4S  179.7E ML=4.2  EMSC   SOUTH OF KERMADEC ISLANDS    

P:  3SEP2024 166104    33.0S  179.0E 4.0-5.4 BBAAA  So. Kermadec Islands       

 

O:  6SEP2024 17:30:41  35.4S  179.5W MW=5.0  EMSC   EAST OF NORTH ISLAND, N.Z.   

P:  8SEP2024 166104    33.0S  178.0W 4.0-5.6 ACBAA  So. Kermadec Islands       

 

O: 06SEP2024 14:24:59  49.0S  164.6E ML=5.7  GEONET Auckland Islands, N.Z.

O:  6SEP2024 14:24:59  49.1S  164.7E MW=5.2  EMSC   AUCKLAND ISLANDS, N.Z. REGION

P:  4SEP2024 166107    44.0S  168.0E 3.0-4.9 ACCAA  So. Island, N.Z.           

 

This event is at 102 degrees from the M 7.1 in Kamchatka of August 17, 2024 and may have been promoted by energy from that source.

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in the eastern

Andreanof Islands, Alaska. It was not reported felt in this remote region. The last earthquake in the eastern Andreanof Island within about 200 km of today's epicenter with M>=4.6 occurred on July 29, 2024 with M 4.8. The last of M>5.0 was an M 6.1 on December 21, 2023.

 

Forecast 166023 had expected this event within about 50 km was likely around

September 7.

 

O:  6SEP2024 17:16:18  52.0N  173.6W ML=4.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  7SEP2024 166023    52.2N  173.9W 3.5-5.2 AAAAA  Andreanoff Isls, Aleutians 

 

The strongest earthquake felt in the U.S. or Canada  today was an M 2.9 south

of Los Angeles. It was accompanied by an M 2.5 foreshock. NEIC reported this earthquake of M 2.9 in Southern California was felt with intensity up to III in the area(s) of Southern California at Lancaster. EMSC reported short shaking with noise in Poway, California. This region showed enhanced seismicity days before the M 6.7 in the Simi Valley in January, 1994 (Northridge earthquake) and occasionally sees precursory activity such as this prior to larger regional events. The area of  Los Angeles is still expected to see enhanced seismicity for the next week as noted in this summary on September 3, 2024:

 

"A series of light earthquakes - including two of M 3.0 occurred south of Los Angeles in the Channel Islands today. NEIC reported these earthquakes of M 3.1 and M 2.9 South of Los Angeles, California  were felt with intensity up to IV in the area(s) of Los Angeles, California in Palos Verdes, Long Beach, Cypress, Costa Mesa and Oxnard.  The area at this time appears to be somewhat unstable and stronger earthquakes in the area and in the Los Angeles area are expected in the next week." (September 3, 3024)

 

Forecast 165958 had expected today's activity in southern California was likely within about 25 km around September 9. This activity is at 103-105 from strong earthquakes of M 7.0 in Xinjiang, China and Mindanao, Philippines and at 99 degrees from the M 7.4 in Taiwan of April 2, 2024 and may have been promoted by energy from those sources.

 

O: 07SEP2024 05:27:33  33.7N  118.6W ML=2.5  EMSC   CHANNEL ISLANDS REG., CALIFORNIA

O:  7SEP2024 06:03:42  33.7N  118.6W ML=2.9  EMSC   CHANNEL ISLANDS REG., CALIFORN

P:  9SEP2024 165958    33.9N  118.3W 2.5-4.7 AAAAA  So. California             

 

 

 

 

MODERATE EARTHQUAKE IN BOLIVIA TRIGGERED BY TYPHOON YAGI LANDFALL AT ANTIPODE

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 5, 2024

 

 

The strongest earthquake in the world today was an M 5.7 in Bolivia. NEIC reported it was felt with intensity up to III in Bolivia at Challapata and in Iquique, Tarapaca, Chile. EMSC reported light motion in Alto Hospicio, Chile.

This epicenter in Bolivia is at the exact antipode of the landfall of Typhoon

Yagi on the coast of Vietnam and China today (see WEATHER section below). Compare for antipodality landfall of Yagi at 19N 113E with this earthquake in Bolivia of M 5.7 at 19S 67W. The two events occurred simultaneously and a clear triggering effect is observable in this case. In the past issue of this summary data from NOAA on Typhoon Yagi had been presented as:

 

"TYPHOON YAGI (12W)      

 

----  -------  ----------  --------  -----  ------  -------  ---------------

TYPH  YAGI     2024-09-05  00:00 UT  19.2N  113.0E  145 kts  West of Luzon, Philipines     

 

Typhoon YAGI (12W) continued today west of northern Luzon Philippines with winds up to 145 kts. This system is currently located at 19N 120E with winds up to 70 kts and heading to the west. Landfall in the central and northern Philippines could bring enhanced seismicity to that area of the Philippines. It is then likely to reach typhoon levels as it moves into eastern China." (September 3-5, 2024)

 

Yagi had previously been implicated in triggering a moderate earthquake in Luzon, Philippines of M 5.3 and M 5.0 as it moved through that region on September 4, 2024 as reported in this summary:

 

"It is likely that this activity was promoted by landfall in the region today of

Tropical Storm Yagi as proposed in previous issues of this summary:

 

"TC YAGI (12W) formed today east of Leyte and Samar, Philippines with winds up to 55 kts. This system is currently located at 16N 122E with winds up to 55 kts and heading to the west. Landfall in the central Philippines could bring enhanced seismicity to that area of the Philippines.

 

and

 

TS YAGI (12W) continued today east of northern Luzon Philippines with winds up to 70 kts. This system is currently located at 19N 120E with winds up to 70 kts and heading to the west. Landfall in the central and northern Philippines could bring enhanced seismicity to that area of the Philippines. It is then likely to reach typhoon levels as it moves into eastern China." (September 2-4, 2024)

 

Today's event of M 5.7 in Bolivia is the strongest in Bolivia within about 200 km of this epicenter since an M 6.1 on June 29, 2001. When an event of M 6.3 occurred on March 15, 2019 about 250 km to the northeast of today's event this summary noted:

 

 

"A strong M 6.3 earthquake at more than 300 km depth shook the area around Bolivia and Peru today. This is typical of deep focus quakes in this area, an while maximum intensity V was reported from Iquique and Tarapaca, Chile no major damage or casualties were reported. NEIC also gave intensity IV reported from Cochabamba and La Paz, Bolivia and Arica, Chile and III in Cliza and Tupiza Potosi, Bolivia and Tacna, Ilo Moquegua and Habaya, Peru and from Calama, Antofagasta, Chile and in general within about 700 km of the epicenter in Bolivia. CSN reported this earthquake was felt with intensity V in  Tarapaca at Camina; IV in Alto Hospicio, Huara, Iquique, La Tirana, Mamina, Pica, Pisagua and Pozo Almonte and III in Ujiria; in Antofagasta III at Calama and Tocopill and II in Maria Elena; in Atacama with III in Copiapo, Diego de Almagro and Tierra Amarilla; in Arica sith IV in Coya and III in Arica and Pocon Chile, Chile. IGP reported this earthquake was felt with intensity II-III in  Tarata, Tacna, Ilo, Peru. This earthquake occurred within about an hour of local solar midnight and was probably promoted by high earth tides which maximize at this hour. It is also located near the geomagnetic equator and may have been enhanced by geomagnetic effects. The last earthquake within about 200 km of this epicenter with M>=6.3 occurred on February 21, 2017 with M 6.5 about 200 km to the southeast of today's epicenter. Two other such earthquakes have occurred in the region in the past 30 years - an M 6.6 on May 22, 2998 and another M 6.6 on October 10, 1990." (March 15, 2019)

 

Forecasts 166088 and 166071 had expected today's event within about 150 km of today's epicenter Bolivia was likely as a moderately large events around September 6-7, 2024. In addition to being antipodal to the landfall of  Typhoon Yagi, this epicenter is also at 144 degrees from the M 7.0 in Tajikistan of January 22, 2024 and may have been promoted by energy from that source.

 

O:  5SEP2024 10:38:26  19.1S   67.3W MW=5.7  EMSC   ORURO, BOLIVIA               

P:  6SEP2024 166088    20.0S   69.0W 4.0-5.9 AABAA  So. Peru/Bolivia           

P:  7SEP2024 166071    19.0S   69.0W 4.0-5.4 AABAA  So. Peru/Bolivia           

 

 

The second strongest earthquake in the world today was an M 5.5 in the Reykjanes Ridge, North Atlantic Ocean area. NEIC reported it may have been lightly felt in the epicentral area or in Newfoundland and Labrador, Canada. A similar earthquake of M 5.5-5.6 hit about 100 km northeast of this epicenter on August 30, 2024. At the time this summary noted:

 

"The strongest earthquake in the world today was an M 5.6 in the Northern Mid-Atlantic Ridge. It was not reported felt in this remote area. The last earthquake with equal or larger magnitude within about 250 km of this North Atlantic epicenter was an M 5.9 on October 1, 2022. This followed several events of M 5.4-5.6 in the same region in late September, 2022." (August 30, 2024)

 

Forecast 166045 had expected today's epicenter to see active seismicity  within about 100 km around September 3, 2024. This epicenter is at 101 degrees from the M 7.4 in Taiwan of April 2, 2024 and may have been promoted by energy from that source.

 

O:  5SEP2024 18:12:42  52.7N   34.3W MW=5.5  EMSC   REYKJANES RIDGE              

P:  3SEP2024 166034    54.0N   35.0W 4.0-5.4 ABAAA  North Mid-Atlantic Ridge   

 

 

STRONG EARTHQUAKE IN PAPUA NEW GUINEA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 4, 2024

 

 

The strongest earthquake in the world today was an M 6.2 in Papua New Guinea. NEIC reported it was felt with damage with intensity VII in Angoram, East Sepik, PNG. This earthquake occurred near local solar noon with the new moon and was likely promoted by tidal stresses with that alignment. This summary had expected maximum tidal stress with this new moon in previous issues as:

 

"The New Moon  arrived at 01:55 UT on September 3, 2024. Longitudes which will be at local solar midnight at this time are near 30 West while those at local solar noon are near 150 East. These zones include the central Atlantic and Iceland and western Europe in the west and the Kuril Islands, Japan and portions of eastern Indonesia and the Vanuatu Islands in the east. These areas are the most likely to see tidal triggering in the next week. Such events often occur near local solar midnight and noon. A major earthquake is considered likely with this new moon in the 10 days." (September 1-4, 2024)

 

This is the strongest regional aftershock of an M 6.9 on March 23, 2024 about 150 km southwest of today's epicenter. An M 6.5 hit close to today's epicenter on November 27, 2023. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 6.5 in Papua New Guinea. NEIC reported it was felt with intensity up to VII in Wewak, P.N.G. It was probably felt in the epicentral area. This is the strongest earthquake in Papua New Guinea since an M 7.0 about 200 km northwest of today's event on April 2, 2023. Earthquakes of M6.5 and larger have occurred in the past 20 years with M 6.5 on April 22, 2004, July 31, 2011, April 16, 2013 and November 7, 2017.

At the time of the event of M 7.0 on April 2, 2023 this summary noted:

 

 

"The last earthquake of M>=6 in this area of Papua was an M 6.0 on January 18, 2020. but no earthquake larger size than this have been recorded in this area since an M 6.7 on January 10, 2002. ...  This epicenter is at 103 degrees from the mainshocks in Turkey and was probably promoted by energy from those sources." (February 9, 2023)

 

...

 

The last earthquake of M>=7.0 within about 200 km of today's epicenter occurred as an M 7.2 on September 8, 2002 and an M 7.0 on July 17, 1998, the only such regional events in the past 35 years." (April 3, 2023, November 27, 2023)

 

Forecast 165858 had expected a strong earthquake at this time was likely in New Guinea around September 5. This epicenter is at 103 degrees from the M 6.7 earthquake south of Africa of July 10, 2024 and was probably promoted by energy from  this source.

 

O:  5SEP2024 01:03:17   3.5S  144.2E MW=6.2  EMSC   NEAR N COAST OF NEW GUINEA, PN

P:  5SEP2024 165858     3.0S  141.0E 4.0-5.4 AACAA  Papua New Guinea            

P:  7SEP2024 165858     7.0S  144.0E 4.0-5.4 ACAAA  Papua New Guinea           

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in the Andreanof Islands, Aleutians, Alaska. It was not reported felt in the epicentral area. The last earthquake of larger magnitude in the western Andreanof Islands within about 200 km of this epicenter occurred as an M 5.0 on February 29, 2024. At the time this summary noted:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 5.0 in the western Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote area. It occurred near local solar midnight and may have been promoted by tidal stresses which maximize near this hour. The last earthquake in the Andreanof Islands with M>-5 was an M 6.1 on December 21, 2023. At the time this summary noted:

 

 

"The last earthquake in the Andreanof Islands of M>=6.7 was an M 7.0 on August 30, 2013. An earthquake of M 6.4 last occurred in the area on August 15, 2018 and September 4, 2013. At the time of the M 6.4 on August 15, 2018 this summary noted:

 

"The M 6.6 in the Andreanof Islands is the strongest in the U.S. since the M 6.9 in Hawaii of May 4, 2018 and the strongest in Alaska since the M 7.9 in the Gulf of Alaska of January 23, 2018. Earthquakes of M>=6.6 have hit the region of the western Andreanof Islands on three occasions since 1990 - an M 6.6 on May 2, 2008; an M 6.9 on March 20, 1999 and events of M 7.9 and 7.3 on June 10, 1996." (August 15, 2018, October 16, 2023, December 21, 2023, February 29, 2024)

 

Forecast 165752 and 166024 had expected today's event within about 100 km was likely in late August or early September, 2024.

 

O:  4SEP2024 21:41:46  51.4N  179.6W ML=4.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  9SEP2024 166024    52.1N  180.0W 3.5-4.9 BAAAA  Andreanoff Isls, Aleutians 

P: 30AUG2024 165752    50.5N  179.8W 3.5-4.9 BAAAA  Andreanoff Isls, Aleutians 

 

 

MODERATE QUAKE SHAKES CENTRAL PHILIPPINES

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 3, 2024

 

 

The strongest earthquake felt in the world today occurred with M 5.4 in Central Luzon, Philippines. NEIC reported this earthquake of M 5.3 in Luzon, Philippines was felt with intensity up to IV in the area(s) of Luzon, Philippines in Bicol at Daet and Basud and in Tagalog at Lucena, Palestina, Cainta, Taytay, Malanday, and in Manila and Mariveles, Luzon. EMSC reported strong shaking in the central Philippines in Hondagua Lopez, Cainta, Quezon City, Taguig City, Antipolo, Bacoor and Paranaque City among others. PHIVOLCS reported intensity V in Quezon at Jomalig and Polillo, IV in Quezon at Burdeos, Panukulan and Patnanungan and Camarines Norte at Parascale, Santa Elena and Vinzons and III in other areas of Quezon, Camarines Norte; City of Taguig and Pateros Quezon City. Lesser shaking was reported in Camarines Sur, City of Angels and the City of Caloocan and Pasig. An aftershock of M 5.0 was reported by NEIC to have been felt with intensity II-III in the Philippines at Manila and in Taytay, Rizal, Tagalog. It is likely that this activity was promoted by landfall in the region today of Tropical Storm Yagi as proposed in previous issues of this summary:

 

"TC YAGI (12W) formed today east of Leyte and Samar, Philippines with winds up to 55 kts. This system is currently located at 16N 122E with winds up to 55 kts and heading to the west. Landfall in the central Philippines could bring enhanced seismicity to that area of the Philippines.

 

and

 

TS YAGI (12W) continued today east of northern Luzon Philippines with winds up to 70 kts. This system is currently located at 19N 120E with winds up to 70 kts and heading to the west. Landfall in the central and northern Philippines could bring enhanced seismicity to that area of the Philippines. It is then likely to reach typhoon levels as it moves into eastern China." (September 2-3, 2024)

 

The last earthquake in Luzon within about 200 km of today's epicenter with M>=5.3

 was an M 5.2 on January 16, 2023 south of today's epicenter but the last event of larger magnitude was an M 5.5 on December 25, 2020. At that time this summary noted:

 

 

"The strongest earthquake in the world today was an M 5.4-5.5 in Luzon, Philippines. It appears to be a regional aftershock of the M 6.3 which hit Mindoro, Philippines yesterday. Today's event was reported felt with intensity V in Aurora, San Francisco, Quezon, Southern Tagalog and III in Boac and Baguio, Cordillera. The last earthquake of M>=5.5 within about 150 km of this epicenter was an M 5.7 on November 5, 2010 more than 10 years ago. An M 5.6 hit about 150 km southeast of this on March 5, 2012." (December 25, 2020)

 

Forecast 165883 had expected a moderate earthquake in this area was likely around September 4, 2024.

 

O: 03SEP2024 23:55:49  14.9N  122.6E mb=5.0  EMSC   LUZON, PHILIPPINES

O:  3SEP2024 23:16:47  14.9N  122.6E MW=5.3  EMSC   LUZON, PHILIPPINES           

P:  4SEP2024 165883    13.0N  124.0E 3.5-4.9 ABBAA  Luzon, Philippines         

 

An earthquake of M 4.9 was also widely felt in Cyprus today. NEIC reported maximum intensity V in Cyprus at Kissonerga with IV in Chlorakas, Lempa, Koloni, Konia, Kouklia and II-III in Malia, Lemesos, Kato Deftera among others.

EMSC reported strong shaking in Cyprus in Chlorakas, Kato Pafos, Paphos, among many other communities on Cyprus. This is the strongest earthquake in Cyprus since an M 5.3 on February 2, 2022 – an aftershock of an M 6.5 on January 11, 2022. At that time this summary noted:

 

 

"The strongest earthquake in the world today was an M 6.6 in the region of Cyprus south of Turkey. NEIC reported it was felt with intensity VI in Cyprus at Polis, Skouli, Argarka; V in Kossonerga; IV in Regeia, Giolou, Tala, Chiorakas, Lempa, Cyprus. Minor damage accompanied major concern with shaking that lasted for a long period according to press accounts. This is the strongest earthquake near Cyprus within about 250 km since an M 6.8 on October 9, 1996, the only other such event in the area in at least 30 years." (January 11, 2022)

 

Forecast 165969 had expected today's event was likely within about 50 km around September 4, 2024.

 

O:  3SEP2024 21:29:51  34.7N   32.2E MB=4.9  EMSC   CYPRUS REGION                

P:  4SEP2024 165969    35.0N   32.0E 3.5-5.2 AAAAA  Turkey                     

 

A moderate earthquake of M 5.0 occurred in northeastern Iceland today. It was not reported felt in this remote area and is not part of the current volcanic eruptions in Southern Iceland. A volcanic eruption and moderately strong earthquakes hit this region in late August, 2014 and was followed by moderate earthquakes through April 21, 2024. At that time this summary noted in  this regard:

 

 

"The earthquake of M 5.3 in northeastern Iceland is the largest in that area within about 150 km since a series of moderately large events occurred near this epicenter in August and September, 2014 - a volcanic series which included events of M 5.6 and 5.7 on August 26 and 27, 2014. At the time this summary noted:

 

 

"The earthquake of M 5.7 in Iceland is the strongest recorded in that area  since an M 5.8 on September 16, 2002, the only other event of this size in  Iceland in the past 25 years. It is part of the sub-glacial Bardarbunga volcanic eruption in the central portion of that island. ..." (April 21, 2024)

 

Forecast 166053 had expected today's event in Iceland was likely within about 50 km of this epicenter in early September, 2024.

 

O:  3SEP2024 16:31:15  64.6N   17.3W MW=5.0  EMSC   ICELAND                      

P:  6SEP2024 166053    65.0N   17.0W 3.0-4.7 BAAAA  Iceland area               

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the Queen Charlotte Islands near Port Clements, British Columbia, Canada. It was not reported felt in this area. This is the strongest earthquake in the Queen Charlotte Islands since an M 4.4 a year ago on September 2, 2023. It was reported in this summary at the time as:

 

"The strongest earthquake in the U.S. or Canada today was an M 3.8 in the Queen Charlotte Islands region of Canada. It was not reported felt in this remote area. This may be a regional aftershock of the M 4.4 of August 15 in the Queen Charlotte Islands about 100 km southeast of today's epicenter. At the time this summary noted in this regard:

 

 

"An earthquake of M 4.4-4.7 also occurred today in the Queen Charlotte Islands region, Canada. It was reported to have been lightly felt in the epicentral area. The last earthquakes of equal or greater magnitude in the Queen Charlotte Islands Region were of M 5.1 on June 4, 2022 and July 26, 2022. Today's epicenters which began with an M 3.4 near local solar midnight are near the expected longitude of maximum tidal stress with the new moon of August 16 and were probably promoted by stresses associated with that tidal alignment" (August 15, 2023, September 2, 2023)

 

Forecast 166027 had expected today's event within about 150 km was likely around September 3, 2024.

 

O: 04SEP2024 03:17:16  53.5N  133.1W MB=4.2  ECAN WSW OF PORT CLEMENTS, BC 

O:  4SEP2024 03:17:16  53.5N  133.1W ML=4.2  EMSC   QUEEN CHARLOTTE ISLANDS REGION

P:  3SEP2024 166027    53.0N  131.0W 3.0-5.1 AABAA  British Colombia           

 

 

QUIET DAY IN GLOBAL SEISMICITY WITH NEW MOON

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 2, 2024

 

The most widely felt earthquake in the world today occurred as an aftershock

in Taiwan.  NEIC reported this earthquake of M 5.0-5.1 in near Taiwan was felt with intensity up to IV in the area(s) of near Taiwan in Taipei, Taoyuan and in Xiamen, China. It is the strongest aftershock in Taiwan of the April 2, 2024 (M 7.4) since an M 5.2 on May 31, 2024. It appears to be an aftershock of the M 7.4 that hit Taiwan on April 2, 2024. At the time this summary noted:

 

 

"A major M 7.4 earthquake damaged much of the Island of Taiwan today. International Press reports indicated that this event and several strong aftershocks killed at least 7 while injuring more than 700. The quake occurred about 20 km south of Hualien and damaged and toppled buildings while causing many damaging landslides. It is the strongest earthquake to hit Taiwan in at least 25 years - since September 20, 1999 (M 7.7) - the strongest event in Taiwan in the past 35 years. Major earthquakes have most recently hit with M>=7.5 in Taiwan on November 14, 1986 (M 7.8); July 24, 1978 (M 8.0); April 24, 1972 (M 7.7) and January 25, 1972 (M 7.7). JMA gave today's event M 7.7 and reported several minor tsunami waves. A tsunami warning was also made for Taiwan but the Pacific Tsunami Warning Center (PTWC) reported that no damaging tsunami waves had been reported nor were any now expected. NEIC reported it was felt with intensity up to IX (major damage) in the area southwest of Hualien City, Taiwan, EMSC reported it was also felt in mainland China as a double quake in Nanjing City nearly 1000 km from the epicenter, in Wuxi City with mild shaking; Shanghai City, Hong Kong, Hangzhou, Shaoxing, Zhonggeng, Xiamen, and Quanzhou.

PHIVOLCS reported it at M 7.5 was felt in the Philippines with intensity II in Itbayat, Batanes, and I in Basco, Mahatao, Ivana, Uyugan,  and Sabtang, Batanes.

This event may be related to the upcoming solar eclipse of April 8, 2024. It is interesting to note that the total eclipse path through North America is near 103 degrees from Taiwan throughout. The most likely area affected by strong energy from Taiwan in the U.S. is southern and Baja California which is near 103 degrees from today's epicenter and subject to far-field seismic triggering at this time. This distance also passes through areas of Utah and portions of Ontario, Nunuvat and Quebec, Canada. It is likely that the recent geomagnetic storm helped promote this earthquake in Taiwan. The storm occurred at the end of March, 2024 and was one of the largest in recent years as reported in this summary. It had been expected to affect most strongly areas near the geomagnetic equator and at high latitudes. Taiwan is located about 10 degrees north of the local geomagnetic equator. The timing is also suspicious as maximum ionospheric ring current intensities occur about 4-9 days after such storms near 10 degrees either side of the geomagnetic equator." (April 2, 2024)

 

 

Forecast 165915 had expected this event in early September within about 100 km  of today's epicenter.

 

O:  2SEP2024 08:26:25  23.9N  121.7E MW=5.1  EMSC   TAIWAN                       

P:  4SEP2024 165915    22.0N  122.0E 4.0-5.4 ABAAA  Taiwan                     

P:  6SEP2024 165915    24.0N  121.0E 4.0-5.5 BAAAA  Taiwan                     

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 off the coast of Oregon. NEIC reported this earthquake of M 4.2 off the coast of Oregon was felt with intensity up to II in the area(s) of Oregon in Portland.  This area has been relatively quiet in recent months. The last earthquake of M>=4.2 occurred on May 4, 2024 with M 4.3. The last of significantly larger magnitude was an M 5.7 on March 27, 2024. At the time this summary noted:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 5.7 off the coast of Oregon. NEIC reported it was felt with intensity up to III along the coast of Oregon, especially in the Port Orford area. EMSC reported light shaking in Springfield, Oregon. A foreshock of M 3.0 hit the area within minutes of local solar noon about 12 hours earlier and was felt in the Port Orford, Oregon area.  These earthquake occurred near local solar noon and  midnight and may have been promoted by tidal stresses with the full moon" (March 27, 2024) of

 

Forecast 166005 had expected today's event within about 50 km was likely  around September 2.

 

O:  2SEP2024 18:01:07  43.4N  127.1W MW=4.2  EMSC   OFF COAST OF OREGON          

P:  2SEP2024 166005    43.1N  126.5W 3.0-4.6 AAAAA  Off Coast of Oregon        

 

A series of light earthquakes - including two of M 3.0 occurred south of Los Angeles in the Channel Islands today. NEIC reported these earthquakes of M 3.1 and M 2.9 South of Los Angeles, California  were felt with intensity up to IV in the area(s) of Los Angeles, California in Palos Verdes, Long Beach, Cypress, Costa Mesa and Oxnard.  The area at this time appears to be somewhat unstable and stronger earthquakes in the area and in the Los Angeles area are expected in the next week.

 

Forecast 165958 had expected today's events were likely around September 2. These earthquakes are located at 103-105 degrees from recent strong quakes in Mindanao, Philippines and from Tajikistan and Taiwan and may have been promoted

by energy from those sources.

 

O: 02SEP2024 12:03:27  33.7N  118.6W ML=2.2  EMSC   CHANNEL ISLANDS REG., CALIFORNIA

O: 02SEP2024 14:38:51  33.7N  118.6W ML=3.0  EMSC   CHANNEL ISLANDS REG., CALIFORNIA

O:  2SEP2024 11:34:26  33.7N  118.6W ML=3.0  EMSC   CHANNEL ISLANDS REG., CALIFORN

P:  2SEP2024 165958    34.4N  118.6W 2.5-4.6 AAAAA  So. California             

 

STRONG EARTHQUAKE HITS NEW GUINEA/SOLOMON ISLANDS

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 1, 2024

 

 

The strongest earthquake in the world today was an M 6.4 in the northern Solomon Islands, Papua New Guinea. NEIC reported it was felt with damage in Panguna with intensity VIII. A tsunami was not expected nor observed. No tsunami warning was issued. A moderate foreshock hit the area several days ago and was addressed in this summary as:

 

 

"An unusual earthquake occurred today with M 4.5 in the Bougainville Region, PNG. While this region is typically quite active with events of M>=5.5 often occurring nearly monthly, the last such event occurred as an M 5.8 on March 8, 2023 and it may be overdue for another." (August 29, 2024)

 

Today's M 6.4 may have been promoted by strong tidal stresses associated with the upcoming new moon of September 3 as it occurred at the longitude of maximum stress with this alignment as noted in previous issues of this summary:

 

"The New Moon will arrive at 01:55 UT on September 3, 2024. Longitudes which will be at local solar midnight at this time are near 30 West while those at local solar noon are near 150 East. These zones include the central Atlantic and Iceland and western Europe in the west and the Kuril Islands, Japan and portions of eastern Indonesia and the Vanuatu Islands in the east. These areas are the most likely to see tidal triggering in the next week. Such events often occur near local solar midnight and noon. A major earthquake is considered likely with this new moon in the 10 days." (August 28-September 2, 2024)

 

This earthquake in New Guinea is located on the geomagnetic equator. It occurred at the maximum of an M-class solar flare and may have been promoted by energy (SFE) associated with that flare (#8490). SWPC data for this flare follows:

 

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

8490       1955   2000      2011   M1.1      (September 1, 2024)   9.2E-03  

New Guinea M 6.4 20:13 UT

 

A foreshock of M 5.3 to the west of the mainshock occurred earlier in the day  in Papua New Guinea. NEIC reported it was felt with intensity III in Kimbe West New Britain, PNG.

 

Today's earthquake in Papua New Guinea with M 6.4 is the strongest within  about 200 km of this epicenter since an M 7.9 on January 22, 2017 and is probably an long-term, regional aftershock of that event. This summary noted the event in 2017 at the time as:

 

 

"A great earthquake with preliminary magnitude M 8.0 occurred in the northern

Solomon Islands, Papua New Guinea early on January 22. NEIC reported it was felt with intensity VIII in Arawa, North Solomons; VII in Kokopo, East New Britain and II-IV in Namatanai, New Ireland, Papua New Guinea and II in Honiara, Guadalcanal, Solomon Islands. SWPC did not issue a tsunami warning despite the large magnitude due to the depth near 167 km. The immediate trigger for this event may have been a C1.8 flare (#5300) (the fourth largest in the past 1.5 months) which reached maximum intensity while this epicenter was within minutes of local solar midnight, a prime time for solar flare effects to trigger seismicity. Two other solar flares of higher class also occurred today (C6.1 and C9.3). The C9.3 flare which maximized at 0726 UT may have helped trigger an M 4.4 quake in El Salvador near the maximum output of the flare while the flare of C6.1 may have helped trigger several aftershocks in Central Italy including an M 3.5 within minutes of local solar noon and the occurrence of this flare. The flare of C9.3 is the strongest solar flare in nearly two months - since an M1.0 on November 29, 2016.

 

The M 8.0 is the strongest of the recent earthquakes to hit the southwestern Pacific area. These began with events of M 7.8-7.9 in New Zealand, Fiji, Solomon Islands, New Britain, and the Celebes of Indonesia. Much of the energy from these events is focused at 90 degrees in California and at 103 degrees in  the central U.S. and Mexico where further enhanced seismicity is expected after today's event. In the east, the most likely far-field seismicity promoted from New Britain has been occurring in Iran, Colorado, Madagascar, Nunavut, Canada, New Mexico, Central Mexico following the earlier M 7.8 foreshock." (January 22, 2017)

 

Forecast 165855 and 165863 had expected seismic enhancement within about 100  km of today's event was likely in early September.

 

O:  1SEP2024 20:13:35   6.8S  155.5E MW=6.4  EMSC   BOUGAINVILLE REGION, P.N.G.  

P:  7SEP2024 165855     7.0S  154.0E 4.0-5.8 CABAA  New Britain                 

P:  7SEP2024 165863     6.0S  155.0E 4.0-5.5 CAAAA  Solomon Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in the  Kenai Peninsula of Alaska. NEIC reported it was widely felt in the area with intensity up to VI and IV in Homer and II-III in Anchor Point, Ninilchik, Clam Gulch, Cooper Landing, Kenai, Moose Pass, Anchorage and Girdwood, Alaska. This is the strongest earthquake in the Kenai area of Alaska within about 150 km of today's epicenter in more than a year. The last of larger magnitude was an M 5.4 on March 19, 2023. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 5.4 in Southern Alaska. NEIC reported it was felt with intensity V in Alaska at Anchor Point, Homer, Ninilchik, IV in Kenai National Wildlife Refuge and III in Clam Gulch, Kasilof, Soldotna, Sterling, Cooper Landing, Kenai, Anchorage, Girdwood, Iliamna, Fort Richardson, Eagle River, Willow, Wasilla, Chugiak, Palmer and Valdez. This is the largest earthquake within about 200 km of this epicenter in the  Kenai Peninsula of Alaska since an M 5.8 about 100 km southwest of today's epicenter on May 27, 2019. At the time this summary noted in this regard:

 

The strongest earthquake in the world today was an M 5.8 in the Kodiak Island region of Southern Alaska. NEIC reported intensity IV in Homer and Anchor point and II-III in Ninilchik, Pedro Bay, Kodiak Kenai NTL, Kasilof, Soldotna and Sterling, Alaska among others. This is the strongest earthquake in the Kodiak area within about 150 km of this epicenter since an M 7.1 to the north on January 24, 2016." (May 27, 2019, March 19, 2023)

 

Forecast 166047 had expected today's events within about 100 km was likely around September 3.

 

O:  1SEP2024 13:20:20  59.6N  151.5W MW=4.5  EMSC   KENAI PENINSULA, ALASKA      

O:  1SEP2024 13:20:21  59.7N  151.5W MW=4.6  ANSS   KENAI PENINSULA, ALASKA      

P:  3SEP2024 166047    60.5N  151.5W 3.2-5.3 AAAAA  Central Alaska             

 

An unusually large M 3.8-4.6 earthquake also occurred in Quebec, Canada today near the Vermont border with the U.S. NEIC reported it was felt with intensity up go IV in Quebec, Canada in Pierreville, Nicolet, Drummondville, Louiseville, Saint-Germain-d-Grantham, Maskinonge, Alencon, Sorel, among others in Quebec and in Vermont at Enosburg Falls (V), Burlington, Winooski, Chelsea, Ludlow, Bellows Falls, among others in that state and as far as Willsboro, New York, Ontario, and North Adams, Massachusetts. It may have been felt in Pennsylvania, New Jersey and Michigan as well. EMSC reported strong shaking in Quebec at Saint-Elphege, Yamaska, Berthierville, Trois-Rivieres, Saint-Leon-le-Grand, Mandeville, Saint-Hyacinthe among others. Earthquakes Canada reported this event at M 4.6 and that it was felt in the epicentral area. The last earthquake listed by NEIC within about 200 km of today's epicenter with M>=4.6 occurred more than 35 years ago. The last within  250 km was an M 5.0-5.2 on June 23, 2010 and on April 20, 2002 both to the west of today's epicenter. At the time of the June, 2010 event this summary noted:

 

 

"A moderate earthquake of M 5.0 shook much of eastern Canada and the northeastern United States today. The earthquake forced the evacuation of the Parliament building in Ottawa. Workers left for the day while the building was inspected. Buildings in Toronto were emptied. Toronto will be the meeting place of the G20 summit this weekend. This is believed to be the largest earthquake in the region since an M 6.1 in 1935. Damage was reported from Graceland, Quebec and surrounding communities. Trains were interrupted and a portion of route 307 east of Quebec has been closed after it had collapsed. Structural damage was also reported to buildings in Gatineau, Quebec and to  three Ottawa schools. Windows shattered in Ottawa's Rideau Centre shopping Mall and the First Avenue Public School was closed because of cracks. A portion of a bridge in Bowman, Quebec near the epicenter is missing over a 50-meter stretch and traffic on Route 307 was diverted. A church in Gracefield saw the ceiling and chimney collapse in the earthquake and power was cut in some areas. The largest earthquakes in the region occurred in 1935 and in 1732 (M 6.2) southeast of this event. That event caused significant damage in Montreal. Smaller events occur several times a year in the region. The mainshock was followed by at least 20 aftershocks according to Earthquakes Canada." (June 23, 2010)

 

Forecast 165996 had expected today's event within about 100 km was likely around September 1.

 

O:  1SEP2024 09:43:36  46.0N   72.8W ML=3.8  EMSC   ST. LAWRENCE VALLEY REG., CANA

O:  1SEP2024 09:43:37  46.0N   72.8W MB=4.6  ECAN OF PIERREVILLE, QC, FELT       

P:  1SEP2024 165996    45.0N   73.0W 2.0-4.4 AAAAA  New England                

P:  1SEP2024 165996    45.0N   73.0W 2.0-4.4 AAAAA  New England                

 

 

An unusually large earthquake of M 3.4 also occurred today in the Mammoth Lakes

in Central California near the Nevada border. The last earthquake of M>=3.5 in the Mammoth Lakes area within about 75 km of today's epicenter occurred as an M 3.6 on February 12, 2024 but the last earthquake of significantly larger magnitude in the area was an M 3.9 on December 2, 2022 and on March 31, 2022.

 

MODERATELY STRONG QUAKE IN SOUTH SANDWICH ISLANDS

 

EARTHQUAKE SUMMARY FOR AUGUST 31, 2024

 

The strongest earthquake in the world today was an M 5.6 in the South Sandwich

Islands. It was not reported felt in this remote area. This is the strongest

earthquake in the South Sandwich Islands since an M 5.7 on June 19, 2024. At that time this summary noted in this regard:

 

 

"While the South Sandwich Islands have been active in May and June, 2024 today's event of M 5.7 is the strongest in the region since a similar M 5.7 on February 14, 2024. The last such earthquake in the South Sandwich Islands of larger magnitude was an M 5.8 on November 30, 2023. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 5.8 in the South Sandwich Islands. This event was not reported felt in this remote area. A major earthquake of M 7.5 hit about 200 km southeast of today's epicenter on August 12, 2021 but the last earthquake within this range of today's event with equal of larger magnitude was recorded on August 18 and December 7, 2021 with M 5.8-5.9. Today's event was probably promoted by geomagnetic effects which maximize near the geomagnetic equator and at high latitudes." (November 30, 2023, June 20, 2024)

 

This epicenter is near the antipode of the M 7.1 in Kamchatka that occurred on August 17, 2024 and was probably promoted by energy from that source. Readers may check 58S 25W for the South Sandwich Islands event and 53.0N 159E for Kamchatka for antipodality. It is also near 103 degrees from the Tonga quake of M 6.9 of August 25 and may have been promoted by energy from that source.

Two unusual earthquakes also occurred today at 144 degrees from the Tonga quake – an M 4.0 in Crimea and an M 5.0 in the Northern Mid-Atlantic Ridge which also were likely promoted by energy from Tonga.

 

Forecasts 166111 and 165829 had expected this event within about 100 km was likely at the end of August or early September, 2024.

 

O:  1SEP2024 00:53:16  58.0S   25.7W MB=5.6  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  5SEP2024 166111    58.0S   25.0W 4.0-6.2 BAAAA  So. Sandwich Islands       

P: 27AUG2024 165829    59.0S   26.0W 4.0-6.2 BAAAA  So. Sandwich Islands       

 

MODERATELY STRONG EARTHQUAKE IN NORTHERN ATLANTIC

 

EARTHQUAKE SUMMARY FOR AUGUST 30, 2024

 

The strongest earthquake in the world today was an M 5.6 in the Northern Mid-Atlantic Ridge. It was not reported felt in this remote area. The last earthquake with equal or larger magnitude within about 250 km of this North Atlantic epicenter was an M 5.9 on October 1, 2022. This followed several events of M 5.4-5.6 in the same region in late September, 2022. At the time this summary noted:

 

 

"The earthquake of M 5.9-6.0 in the Reykjanes Ridge today is the strongest to date in the current series which has included two events of M 5.7 in the past four days in the region. It occurred at a high latitude near local solar midnight and was also probably promoted by effects from the geomagnetic storm (see above). The aftershock series in northern Sumatra ceased immediately after the M 5.9 in the Reykjanes Ridge. An M 5.0 in the Reykjanes aftershock series

occurred within minutes of local solar midnight during the geomagnetic storm today. This sequence had been noted in previous issues of this summary as:

 

"This is the strongest activity within about 200 km of this epicenter in the Reykjanes area since an M 6.8 on February 16, 1998. That was the only earthquake in this region with M>=5.7 in at least 30 years." (October 1, 2022)

 

Forecasts 166034 and 165762 had expected today's event within about 50-100 km  was likely at the end of August or early September, 2024.

 

O: 30AUG2024 09:32:25  53.0N   33.4W MW=5.6  EMSC   REYKJANES RIDGE              

P:  1SEP2024 166034    53.0N   32.0W 4.0-5.4 AAAAA  North Mid-Atlantic Ridge   

P: 27AUG2024 165762    54.0N   35.0W 4.0-5.5 BAAAA  North Mid-Atlantic Ridge   

 

The strongest earthquake in the U.S. or Canada today was an M 3.5  and an M 4.0 in the Fox Islands, Aleutians. NEIC reported it was felt with intensity up to II in the Fox Islands at Nikolski. NEIC reported this earthquake of M 3.7 in the Fox Islands, Alaska was felt with intensity up to II in the area(s) of the Fox Islands, Alaska in Unalaska. The last earthquake of larger magnitude in the Fox Islands was an  4.4 on July 4, 2024. But the last event of significantly larger size in  the Fox Islands occurred as an M 6.0 on May 19, 2024. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 6.0 in the Fox Islands. NEIC reported it was felt with intensity up to V in Nikolski, Alaska. This is the first earthquake in the U.S. or Canada of M>=6 in the year 2024 to date. The last such earthquake of M>=6 occurred on December 21, 2023 with M 6.1 and prior to that as a M 6.4 on October 16, 2023. Today's earthquake is also the strongest within about  200 km of today's epicenter since an M 6.8 and 6.6 on January 11, 2022." (May 19, 2024)

 

Forecasts 166030 and 165758 had expected this activity in the Fox Islands within about 50 km was likely around August 30-September 1.

 

O: 30AUG2024 18:21:57  52.7N  168.8W ML=4.0  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  1SEP2024 166030    52.4N  169.4W 3.5-5.4 AAAAA  Fox Islands, Aleutians     

 

O: 31AUG2024 00:41:54  53.5N  165.9W ML=3.5  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 30AUG2024 165758    53.7N  165.3W 3.5-5.0 AAAAA  Fox Islands, Aleutians     

 

 

STRONG AFTERSHOCK IN KAMCHATKA ASSOCIATED WITH SOLAR FLARE

 

EARTHQUAKE SUMMARY FOR AUGUST 29, 2024

 

The strongest earthquake in the world today was an M 6.0 aftershock in  Kamchatka. It was felt with moderate intensity in Petropavlovsk, Russia.

EMSC reported moderate shaking in Petropavlovsk and Yelizovo, Russia. An aftershock of M 4.3 was also reported felt with light intensity in Petropavlovsk. This may have been triggered by an M1.2 solar flare which began about the time Kamchatka was at local solar noon (0120 UT) and peaked about an hour later (0206 UT). SFE associated with this flare may have helped promote the size of this earthquake in Kamchatka. This is the strongest aftershock to date of the M 7.1 in Kamchatka of August 17, 2024. Following is the SWPC for flare 7830, associated with the M 6.0 in Kamchatka:

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

7830       0200   0206      0214   M1.2      (August 30, 2024)   7.7E-03 

 

Today's M 6.0 in Kamchatka follows events of M 7.1 on August 17, 2024 and prior to that  an M 6.5 on April 3, 2023 and an M 6.2 on March 28, 2019. At the time of the 2023 quake this summary noted:

 

 

"A strong earthquake of M 6.5-6.9 shook areas of Kamchatka, Russia today. RSS reported at least 100 people reported feeling this earthquake with moderate shaking. NEIC reported it was felt with maximum intensity V in Kamchatka at Mohovaja and IV in Petropavlovsk. This event is located near Barkhatnaya Sopka Volcano (about 15 km away) and may provoke volcanism at that Volcano. The last earthquakes in the region of Kamchatka of M>=6.5 occurred on January 30, 2016 (M 7.2) and August 24, 2006 (M 6.5)." (April 3, 2023)

 

Forecast 165757 had expected enhanced seismicity in Kamchatka was likely around

August 28.

 

O: 30AUG2024 04:31:48  52.8N  160.3E mb=4.3  EMSC   OFF EAST COAST OF KAMCHATKA

O: 30AUG2024 04:24:23  53.0N  160.2E MW=6.0  EMSC   OFF EAST COAST OF KAMCHATKA  

P: 28AUG2024 165757    52.0N  161.0E 4.0-5.4 AAAAA  E. of Kamchatka            

 

 

 

STRONG EARTHQUAKE SHAKES EL SALVADOR AND GUATEMALA

 

EARTHQUAKE SUMMARY FOR AUGUST 28, 2024

 

 

The strongest earthquake in the world today was an M 6.1 off the coast of El Salvador. NEIC reported it was felt with intensity up to IV in El Salvador in La Libertad, Zaragoza, Nuevo Cuscatlan, Nueva San Salvador, Antiguo Cuscatlan, Guaymango, Ayutuxtepeque, Quezaltepeque, Apopa and Guazapa and in portions of Guatemala. EMSC reported strong shaking in El Salvador at San Salvador, Nueva San Salvador, Apopa, and in Guatemala at Colonia Valles De Vista Hermosa, Colonia Valle Dorado, La Floresta, Guatemala City, No major damage or tsunamis were associated with this earthquake. Several aftershock and foreshocks were not reported felt except for an M 4.2 felt lightly in San Salvador, Santa Ana, El Salvador and in Guatemala City, Guatemala. This event was probably promoted by tidal effects as it lies near the longitude of maximum tidal stress with the previous full moon as noted in previous issues of this summary:

 

"The full moon arrived at 18:26 UT on August 19, 2024.   Longitudes which were at local solar midnight at this time are near 85 East while those at local solar noon are near 95 West. These include areas of central North America and the East Pacific in the west and central Asia including China, India, Nepal in the East. These areas are most likely to see moderate tidal triggering at this time. Tidal enhancement of regional seismicity is possible in many areas, however, a major earthquake associated with this new moon is considered possible in the next week by this report." (August 20-25, 2024)

 

Today's event occurred at the height of a strong geomagnetic storm - the strongest in the past month and may have been promoted by geomagnetic effects. This is the strongest earthquake near El Salvador since an M 6.5 on July 19, 2023. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 6.5-6.6 in El Salvador, Central America. NEIC reported it was felt with maximum intensity VIII in El Salvador at Chirilagua, San Miguel; VII in Concepcion, Batres Usulutan, VI in Intipuca La Union; V in Usulutan, IV in San Aleo, San Miguel, Santiago de Maria, San Luis la Herradura La Paz and lesser shaking in El Vijo and Ciudad Barrios, San Miguel. This event was preceded by several light foreshocks.  Enhanced activity in this region had been expected at this time as it lies near the longitude of maximum tidal stress with this new moon as discussed previously in this summary ...

 

The new moon was expected to promote seismicity in Central America near 90 Wes

longitude (see tidal forecast above). Two groups of earthquakes today indicated by their timing to have been triggered by tidal stresses with this alignment. They occurred near local solar midnight in an area where strong tidal stresses were expected with this new moon in the area off the coast of El Salvador (M 3.9, 3.9)..." (July 19, 2023)

 

Forecasts 165872 and 165614 had expected today's activity in El Salvador was likely in late August or early September within about 50 km of today's epicenter.

 

O: 28AUG2024 20:11:47  12.9N   89.7W ML=4.2  EMSC   OFFSHORE EL SALVADOR

O: 28AUG2024 22:11:47  12.9N   89.7W ML=4.2  EMSC   OFFSHORE EL SALVADOR

O: 28AUG2024 22:14:41  12.9N   89.6W mb=4.3  EMSC   OFFSHORE EL SALVADOR

O: 28AUG2024 22:54:07  12.9N   89.6W ML=4.3  EMSC   OFFSHORE EL SALVADOR

O: 28AUG2024 22:58:01  12.9N   89.7W ML=4.2  EMSC   OFFSHORE EL SALVADOR

O: 28AUG2024 21:57:56  13.0N   89.6W MW=6.1  EMSC   OFFSHORE EL SALVADOR         

P:  3SEP2024 165872    13.0N   89.0W 3.5-5.5 BAAAA  Coast of Central America   

P: 29AUG2024 165614    13.0N   90.0W 3.5-5.5 AAAAA  Guatemala                  

 

An earthquake of M 5.1 was also widely felt in the area of Hania, Crete, Greece today. NEIC reported intensity up to IV in Crete at Galatas, Ayia Marina, Khania, Kolimvari, Kissamos, Palaiokhora, Souda, Vrises, Yerani and in Iraklion, Greece. NEIC reported this earthquake of M 3.0 in Hawaii was felt with intensity up to II-III in the area(s) of Hawaii at Paauilo, Kamuela and Honokaa.  EMSC reported strong shaking in Crete, Greece at Gavdos, Kastri, Patsianos, Chora Sfakion, Ano Myxorrouma, Akoumia, Agia Galini and as far as Sparta, Greece more than 300 km from the epicenter. No major damage or tsunami was reported with this earthquake although the press reported local residents were startled and ran from their homes.

 

This is the strongest earthquake in Crete since an M 5.2 on May 18, 2023.  A strong M 6.5 occurred in Crete on October 12, 2021 - an aftershock of an M 6.0 on September 27, 2021. At the time this summary noted:

 

 

"The strongest earthquake in the world today was an M 6.0 in Crete, Greece. NEIC reported it was felt with minor damage in Iraklion, Greece with VIII in Episkopi, Khanion tou Kokkini, Arkalokhorion, VI in Gournai, Skalanion, Kato Gouval, V in Thrapsonon, IV in Epano Arkhanai and Nea Alkarnassoa and II in Anissaras. Reuters reported today's event killed at least one person when the dome of a church at Arkalochori collapsed and damaged many buildings near the epicenter. In addition several people were injured and some were trapped in debris from damaged buildings. Evacuations took place through much of the island. Aftershocks could damage older buildings further. The last earthquake in Crete with M>=6 was an M 6.6 about 150 km southeast of today's epicenter on May 2, 2020. At the time of this event this summary noted:

 

"Today's earthquake in Crete is the strongest within about 200 km of that epicenter in at least 30 years. The area has been active in recent months with an M 5.8 to the east on January 30, 2020 and an M 6.0 on November 27, 2019. These events were more than 200 km from today's epicenter." (May 3, 2020, September 27, 2021)

 

Forecast 165665 had expected today's activity in Crete within about 100 km

was likely at the end of August.

 

O: 28AUG2024 16:29:54  34.8N   24.2E MW=5.1  EMSC   CRETE, GREECE                

P: 21AUG2024 165665    34.0N   25.0E 3.0-4.7 CAAAA  Crete                      

P: 28AUG2024 165665    34.0N   26.0E 3.0-4.6 AABAA  Crete                      

 

An unusual earthquake occurred today with M 4.5 in the Bougainville Region, PNG.

While this region is typically quite active with events of M>=5.5 often occurring nearly monthly, the last such event occurred as an M 5.8 on March 8, 2023 and it may be overdue for another. Forecast 165591 had expected today's event within about 100 km was likely around August 27.

 

O: 28AUG2024 07:25:58   4.9S  155.1E MB=4.5  EMSC   BOUGAINVILLE REGION, P.N.G.  

P: 27AUG2024 165591     5.0S  154.0E 4.0-5.5 AAAAA  New Britain                

 

MODERATE EARTHQUAKES IN UNIMAK, ALASKA AREA; MAYOTTE

 

EARTHQUAKE SUMMARY FOR AUGUST 27, 2024

 

It was a quiet day in global seismicity. The strongest earthquake in the world today was an unfelt earthquake of M 5.1 in the Kermadec Islands of New Zealand.

An unusual M 4.6 was widely felt in the area of Mayotte, an island east of central Africa. While Mayotte has seen several active periods in recent years, today's event is the strongest in the region since an M 4.5 on March 3, 2021 and prior to that an M 4.8 on November 10, 2020. The area became active in May, 2018 after an M 5.8 on May 15, 2018. At that time this summary noted:

 

 

"A moderately strong earthquake hit the region of Mayotte north of Madagascar today with M 5.8. NEIC reported it was felt with maximum intensity VI in Maoytte at Ouangani and V in Mtsamboro, Mamoudzou and Pamanzi. It was felt with

lesser intensity of II-III in Mayotte at Dzaoudzi, Pamanzi, Dembeni, Aftershocks of M 4.0-5.0 were reported felt lightly in Dzaoudzi, Pamanzi, Mayotte. Other areas feeling today's M 5.8 include the Comoroa at Nioumachoua and Madagascar to Marovoay. Felt reports came to NEIC from as far as 400 km from the epicenter. This follows a series of foreshocks which have occurred over the past four days.

The event of M 5.8 today in the Mayotte Region is the strongest within about 300 km of this epicenter in at least 28 years. No other earthquakes of M>=5.8 have ever been reported in this area. The last earthquake, and largest to date in the region had been an M 6.6 on July 15, 1960. Two events of M 5.2 hit the area on December 1, 1993 and May 21, 2000. Forecast 116878 had expected this event was likely within about 150 km of this epicenter around May 15." (May 16, 2018)

 

NEIC reported today’s earthquake of M 4.6 in Mayotte was felt with intensity up to V in the area(s) of Mayotte in Dzaoudzi and III in Tsingoni and II in Paje Comoros. EMSC reported moderate shaking in Mayotte at Pamadzi, Dzaoudzi, Mamoudzou, Dembeni, Boueni, Koungou.

 

O: 27AUG2024 15:51:07  13.1S   45.6E MB=4.6  EMSC   MAYOTTE REGION               

 

O: 27AUG2024 22:43:02  34.4S  179.9W MW=5.1  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 30AUG2024 165821    33.0S  179.0W 4.0-5.4 BBAAA  So. Kermadec Islands       

 

The strongest earthquake in the U.S. or Canada today was an M 4.8 in the region of False Pass, Alaska. NEIC reported it was felt with intensity up to III in King Cove, Alaska. An M 5.1 hit the region yesterday and was reported in this summary as:

 

"The strongest earthquake in the U.S. or Canada today was an M 5.1 in the Unimak

Island area of Alaska. NEIC reported it was felt with intensity up to III in Sand Point, Alaska. This may have been triggered by antipodal focusing of earthquake energy. It follows a pair of events of M 5.5 each at the antipode of this which occurred on August 23 and were noted in this summary at the time as:

 

 

"The strongest earthquakes in the world today were a pair of events of M 5.5 each in the Indian Ocean south of Africa. They were not felt in this remote area. This epicenter is at the antipode of the Unimak and Alaska Peninsula and could enhance seismicity in that area in the next several days." (August 23, 28, 2034)

 

Today's earthquake of M 4.5 occurred within minutes of local solar noon and was probably promoted by strong tidal stresses which maximize near this hour.

 

Forecast 165770 had expected today's event within about 50 km was likely

around August 27.

 

O: 27AUG2024 22:12:01  54.4N  162.8W MW=4.5  EMSC   ALASKA PENINSULA             

P: 27AUG2024 165770    54.5N  163.5W 3.5-4.9 AAAAA  Unimak Islands, Aleutians  

 

O: 27AUG2024 15:01:00  54.5N  159.8W ML=3.9  EMSC   SOUTH OF ALASKA              

P: 22AUG2024 165770    54.5N  161.8W 3.5-4.9 BABAA  Unimak Islands, Aleutians  

P: 27AUG2024 165770    54.5N  163.5W 3.5-4.9 AABAA  Unimak Islands, Aleutians  

 

STRONG QUAKES SHAKE INDONESIA

 

EARTHQUAKE SUMMARY FOR AUGUST 26, 2024

 

Moderate earthquakes shook two areas of Indonesia today. These were an M 5.5 south of Java and an M 5.8 in the Banda Sea north of Australia. The strongest earthquake in the world today was the M 5.8 in Banda, Indonesia. NEIC reported it was felt with intensity up to III in Northern Territory, Australia at Coonawarra and Darwin. EMSC also reported light shaking in  Darwin, Australia. Strong earthquakes in Banda Sea are often felt in northwestern Australia. Today's event is the strongest within about 200 km of this epicenter since an M 7.1 and aftershocks on November 8-10, 2023. At the time this summary noted:  

 

"The strongest earthquakes in the world today were a pair of strong to major earthquakes of M 6.7 and 7.1 in the Banda Sea, Indonesia. NEIC reported it was felt with maximum intensity III in the Banda Sea, Indonesia area. The mainshock of M 7.1 was preceded about a minute early by a foreshock of M 6.7 which was felt in the area with maximum intensity VI. These events were also felt in northern Australia at Darwin. BMG reported the mainshock of M 7.1 was felt with intensity up to V in the Tanimbar Islands. BMG reported this activity in the Tanimbar region was felt with intensity IV in Bandaneira, III in Maluku Tengah, Banda, Maluku Tenggara, at Kecil, Manyeuw, Hoat Sorbay, in Tanimbar at Tanimbar Selatan, Selaru, Wer Tamrian, Wer Maktian; in Seram Bagian in Maluku Barat Daya and in Kota Tual and many other communities experienced lesser shaking. No tsunamis were observed or expected with these events." (November 8, 2023)

 

Forecast 165583 had expected today's event was likely within about 50 km around

August 23.

 

O: 27AUG2024 02:15:18   7.2S  129.5E MW=5.8  EMSC   KEPULAUAN BABAR, INDONESIA   

P: 23AUG2024 165583     7.0S  129.0E 4.0-5.4 BAAAA  Banda Sea                  

 

An earthquake of M 5.5 was also felt in Indonesia today south of Java. NEIC reported it was felt with intensity up to VI in Java with IV in Depok Yogyakarta and II-III in Prambanan, Klaten, Muntilan, Kebumen, Wengon, Cikeruh, Karawang and Pamulang. EMSC reported strong to moderate shaking in Java, Indonesia at Wonosari, Pengasih, Kasihan, Depok, Ngaglik, Kalasan, Jogja, Mlati, Ngemplak, Purworejo, Bayat, Turi, Baki, Jambu, Semarang and Pondok Aren. This earthquake may have been triggered by Solar Flare Effects (SFE) as it occurred at the maximum of flare 7260 according to SWPC flare data below:

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

7260       1252   1258      1307   C5.5      (August 26, 2024)   4.5E-03  

Java M 5.5 12:57 UT

 

Today's earthquake in Java of M 5.5 is the strongest within about 200 km

of this epicenter since an M 5.8 more than a year ago on June 20, 2023. At the time this summary noted:

 

"A strong earthquake of M 5.8-6.4 shook the region of Java, Indonesia today.

BMG reported this earthquake of M 6.4 in Java, Indonesia was felt with intensity II-III in the area(s) of Java, Indonesia with VI in Pracimantoro, Wonogiri, Java, Pacitan; V in Wonogiri, Gunungkidul, Kebumen, Purworejo, Mageland, Kulon Progo, Bantul, Gunungkidul, Sleman, Yogyakarta, Pacitan, Ponorogo, Pasuruan, Mojokerto, Bojonegoro, Lombok. NEIC reported an aftershock of M 4.9  in  Bali, Indonesia was felt with intensity II-III in the area(s) of  Bali, Indonesia in Kuta. News sources reported the quake injured at least 10 people while one person died of a heart attack during the quake. The associated shaking caused minor damage to hundreds of residences, offices and health and school facilities mainly in Yogyakarta and Central Java. No tsunami was expected or observed with This earthquake may have been triggered by SFE from flare #6340 which was ending simultaneously with this earthquake (see flare list below).

 

This is the strongest earthquake within about 200 km of this epicenter in  Java since an M 6.1 on January 25, 2014. The last event of M>=6.4 in this area occurred more than 35 years ago." (June 30, 2023)

 

Forecast 165600 had expected today's event south of Java was likely within

about 50 km around August 26.

 

O: 26AUG2024 12:57:40   8.7S  110.2E MW=5.5  EMSC   JAVA, INDONESIA              

P: 26AUG2024 165600     9.0S  110.0E 4.0-5.4 AAAAA  So. of Java                

 

The strongest earthquake in the U.S. or Canada today was an M 5.1 in the Unimak Island area of Alaska. NEIC reported it was felt with intensity up to III in Sand Point, Alaska. This may have been triggered by antipodal focusing of earthquake energy. It follows a pair of events of M 5.5 each at the antipode of this which occurred on August 23 and were noted in this summary at the time as:

 

 

"The strongest earthquakes in the world today were a pair of events of M 5.5 each in the Indian Ocean south of Africa. They were not felt in this remote area. This epicenter is at the antipode of the Unimak and Alaska Peninsula and could enhance seismicity in that area in the next several days." (August 23, 2034)

 

Today's earthquake of M 5.1 in this region south of Alaska is the strongest within about 150 km of this epicenter since an M 5.6 on August 1, 2024 and an M 5.4 on  September 21, 2023. At the time this summary noted:

 

 

"The strongest earthquake in the U.S. or Canada today was an M 5.4 in the Alaska Peninsula Alaska. NEIC reported it was felt with intensity V in Sand Point and King Cove and III in False Pass, Alaska. This is the strongest earthquake in the region of the Alaska Peninsula since an M 5.6 on August 3, 2023. At the time this summary noted:

 

 

"The strongest earthquake in the world, the U.S. or Canada today was an M 5.6 in the Unimak Island area of Alaska. NEIC reported it was felt with intensity IV in Sand Point, King Cove and II-III in False Pass, Chignik Lagoon, Alaska. This is the strongest aftershock to date of the M 7.2-7.4 of July 16, 2023 in the Alaska Peninsula about 50 km east of today's epicenter. It is the second largest earthquake in this area since an M 6.1 on July 28 and July 29, 2020. In the past 15 years many of the strongest earthquakes in this region have occurred in mid- to late-July and early August, perhaps indicating a seasonal triggering component. All events in the region with M>=6 since 2008 have occurred in late July including an M 6.1 on July 16, 2011; an M 6.0 on July 19, 2018; an M 6.1 on July 28, 2020 and an M 7.2 on July 16, 2023." (August 3, 2023)

 

This event occurred near local solar noon and may have been promoted by strong tidal stresses which maximize near this hour." (September 21, 2023)

 

Forecast 165770 had expected today's event in this region was likely around

August 22.

 

 

O: 26AUG2024 15:49:40  54.6N  159.7W MW=5.1  EMSC   SOUTH OF ALASKA              

P: 22AUG2024 165770    54.5N  161.8W 3.5-4.9 BABAA  Unimak Islands, Aleutians  

 

 

 

 

PORTUGAL QUAKE; MAJOR EARTHQUAKE IN TONGA STRIKES AT LOCAL SOLAR NOON

 

EARTHQUAKE SUMMARY FOR AUGUST 25, 2024

 

 

A moderately strong earthquake of M 5.4 was widely felt in Portugal today. It occurred near the antipode of an earlier M 6.9 in Tonga and may have been related to antipodal focusing of seismic energy at the antipode of that epicenter. NEIC reported the earthquake in Portugal was felt with maximum intensity VII in Lisbon, Portugal at Benedita Lisboa e Vale do Tejo and VI in Portugal at Ponte Norte, Sines Alenteho with V in Trafaria Lisboa e Vale do Tejo, Santa Barbara de Nexe, Monte Redondo, Moita, Loures, Castro, Carregado, Bucelas, Bombarral, Arrentela, Alferrarede, Lisbon, and with lesser shaking throughout Portugal and portions of Spain. EMSC reported a possible minor tsunami with maximum shaking in Portugal near the towns of Sines, Zambujal de Cima, with a great deal of noise. Euro Weekly News reported no major damage or injuries with this earthquake. The last earthquake located near Portugal with M>=5.4 occurred more than 35 years ago. The only comparable event in the past 35 years occurred with M 5.4-5.5 on December 17, 2009 and January 10, 2006. At the time this summary noted:

 

 

"A moderately strong earthquake of M 5.7-6.3 hit west of Gibraltar today and was felt widely in Portugal, Spain and Morocco. Spain's Seismological Institute gave the M 6.3 while NEIC gave M 5.7. The most likely magnitude given the widely felt region is M 6.3. Reports from NEIC often underestimate the magnitude of larger events initially and give larger values at a later time.  NEIC reported maximum intensity VI in Odemira, Alentjo, Portugal and V in Portugal at Boliqueime, A dos Cunhadoa, Aljezur, Azambuja, Baixa de Banheira, Castanheira do Ribatejo, Grandola, Lagoa, Luz, Malveira, Mealhada, Monchique, Montenegro, Pampilhosa, Portimao, Porto de Mos, Soure, Queijas, Rio Maior, Serpa, Serta, in Spain at Caceres, and in Morocco at Khouribga and Settat. Intensity IV was generally felt within about 300 km of the epicenter; III within about 500 km and II within 500-700 km from the epicenter. Spanish media reported the quake was also felt in Seville, Cordoba and Huelva, Spain. The epicenter is located near the presumed epicenter of the great Lisbon earthquake of November 1, 1755 which destroyed along with a tsunami much of the built coast of Portugal." (December 17, 2009)

 

Forecast 165401 had expected a moderate earthquake in this region within about 200 km of this epicenter was likely in mid-August. This earthquake is located at 103 degrees from the M 7.4 in Taiwan of April 2, 2024 and at 102 degrees from the M 7.1 in Kyushu, Japan of August 8, 2024 may have been  promoted by energy from those sources.

 

O: 26AUG2024 04:11:39  38.1N    9.4W MB=5.4  EMSC   PORTUGAL                      

P: 13AUG2024 165401    37.0N   11.0W 3.5-4.9 DBBAA  Morocco/Spain              

 

The strongest earthquake in the world today was an M 6.9 followed by an M 6.2 aftershock in Tonga. These events occurred within minutes of local solar noon and were likely triggered by tidal and/or geomagnetic stresses which maximize  near this hour. NEIC reported this earthquake was felt with maximum intensity V in Tonga at Pangai with IV in Tamakautoga, Niue, Nuku'alofa, Haveloloto, and III in Avatele, Alofi and Neiafu Vava'u Tong with slight shaking II in American Samoa. No tsunami was expected by EMSC which reported the quake was felt in Tonga at Nuku'aofa. A regional foreshock of M 4.4 was felt with intensity III in Neiafu Vava'u, Tonga half a day earlier. The last earthquake within about 250 km of today's epicenter in Tonga with M>=6.9 occurred as an M 6.9 on July 2, 2023 and prior to that on November 11 and 12, 2022 with M 7.0 and M 7.3. the time this summary noted:

 

 

NEIC reported today's event followed a series of lesser earthquakes in the region. This series of earthquakes in the Tonga and Fiji Region occurred over the past two days and was addresses in this summary in the previous issue as:

 

"The strongest earthquake in the world today was an M 5.0 in Tonga/Fiji. This event was accompanied by a series of similar-sized earthquakes in the area, many of which occurred at the beginning of C- or M-class solar flares. This summary watches for concentrations of this type in the "FLARE" section of this summary because it may be that instability in a zone such as this may suggest a stronger regional earthquake is likely in the near future. At this writing it has been nearly a year since a significant earthquake in this area." (August 25, 2024)

 

This suggests that patterns of this type may be useful in forecasting upcoming strong or major regional earthquakes. Tonga and Fiji have been active in the past several months including an M 7.2 on June 15, 2023 and an M 7.6 on May 10, 2023. Today's earthquake follows a regional enhancement in Fiji and Tonga which was addressed at the time as:

 

"A series of earthquakes also continued in the area of the Tonga Islands. The strongest of these was an M 5.6 in the northern Tonga Islands. This earthquake occurred at the peak output of flare 6630 - an M1.1 class solar flare and the strongest flare of the day. The earthquake occurred within minutes of local solar noon when immediate flare effects (SFE) are most likely to trigger earthquakes. It is likely it was triggered by SFE. This could indicate that a stronger earthquake in this area is likely at this time especially since the area is at the maximum longitude for tidal effects from the full moon of July 3 (2023)" (July 3, 2023)

 

Forecast 165809 had expected today's event was likely within about 100 km around August 25, 2024. These epicenters are located at the seventh node (72 degrees) from the M 7.1 in Kyushu, Japan of August 8 and may have been promoted by energy from that source. Like the event in Panama today, this epicenter is at 104-106 degrees from the M 6.7 south of Africa of July 10, 2024 and may have been promoted by energy from that source as well.

 

O: 25AUG2024 23:30:52  19.8S  175.0W mb=6.1  EMSC   TONGA

O: 25AUG2024 23:38:00  19.9S  175.2W mb=5.3  EMSC   TONGA

O: 25AUG2024 23:29:08  19.8S  175.1W MW=6.9  EMSC   TONGA                        

P: 25AUG2024 165809    21.0S  175.0W 4.0-5.7 ABAAA  Tonga Islands              

 

A moderately strong earthquake of M 5.8 also occurred south of Panama today. NEIC reported it was felt with damage and intensity VIII in Panama at Cerro Sombrero Ngobe Bugle, and lesser shaking in Chiriqui (IV) at Boquete and Volcan and in San Miguelito, Panama. EMSC reported moderate shaking in Panama at Puerto Armuelles, David, Cahuita. This event occurred within minutes of local solar midnight and may have been promoted by strong tidal stresses which maximize near this hour.

 

This is the strongest earthquake near Panama within about 250 km since an

M 6.3 on April 4, 2023. At the time this summary noted:

 

"The strongest earthquake in the world today was an M 6.7 south of Panama. NEIC reported maximum intensity VIII in Cerro Sombrero, Panama with IV in Remedios; V in Guarumal; IV in Pedregal, David, Berba, Chiriqui and less shaking in Horconcitos, Quitno, Los Algarrobas, Panama among others. This is the strongest earthquake in the area south of Panama within about 250 km of this epicenter since an M 6.9 about 250 km northwest of today's epicenter on August 20, 1999 more than 23 years ago. An M 6.6-6.7 hit near this epicenter on July 21, 2021. An earthquake of M 6.7 also occurred about 300 km southwest of today's epicenter on October 16." (April 4, 2023)

 

Forecast 165574 had expected today's event within about 50 km was likely around

August 28, 2024. This earthquake is located at 101 degrees from the M 7.1 in Kamchatka of August 17, 2024 and may have been promoted by energy from that source. Like the event in Tonga today, this epicenter is at 104-106 degrees from the M 6.7 south of Africa of July 10, 2024 and may have been promoted by energy from that source as well.

 

O: 26AUG2024 05:08:44   7.4N   82.3W MW=5.8  EMSC   SOUTH OF PANAMA              

P: 29AUG2024 165574     7.0N   82.0W 3.5-5.3 BAAAA  Costa Rica                 

 

An unusually large M 4.8 was also felt in Puerto Rico today. This event occurred near local solar midnight and may have been promoted by strong tidal stresses which maximize near this hour. NEIC reported this event was felt with maximum intensity VI in the Dominican Republic at Boca de Yuma with lesser shaking in Santo Domingo, La Roma, Otra Banda and in Puerto Rico with IV in Cabo Rojo, San Sebastian, Barranquitas, with lesser shaking in Mayaguez, Moca, Bayamon, Caguas among others. EMSC reported strong shaking in Bayamon and Mayaguez, Puerto Rico. The last earthquake in Puerto Rico within about 200 km of today's epicenter with M>=4.8 occurred as an M 5.6 on May 15, 2024. At the time this summary noted:

 

"Today's earthquake in Puerto Rico is the largest in that region since an M 6.4 on January 7, 2020 about 200 km southeast of today's epicenter. The last of larger magnitude in northern Puerto within about 200 km of today's epicenter was an M 6.0 on September 24, 2019. An earthquake of M 5.0, the only such event of M>=5 in the past 3 years in Puerto Rico occurred on November 17, 2022." (May 15, 2024)

 

It is not unusual for seismic enhancement to occur in the northern Caribbean during hurricane season, but no tropical cyclones are in the area at this time.

 

Forecast 165628 had expected today's event within about 100 km was likely

around August 27, 2024.

 

O: 26AUG2024 05:16:09  17.9N   68.1W MB=4.6  EMSC   DOMINICAN REPUBLIC REGION    

P: 27AUG2024 165628    18.0N   67.0W 3.4-5.4 AAAAA  Puerto Rico                

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 26AUG2024 01:32:02  52.9N  159.6E MB=4.9  EMSC   OFF EAST COAST OF KAMCHATKA  

P: 28AUG2024 165757    52.0N  161.0E 4.0-5.4 AAAAA  E. of Kamchatka            

 

EMSC reported this earthquake of M 4.9 in Kamchatka, Russia was felt with intensity up to IV in the area(s) of Kamchatka, Russia in Petropavlovsk, Yelizovo, Paratunka.

 

O: 26AUG2024 06:24:30  55.7N  164.4E MB=4.3  EMSC   KOMANDORSKIYE OSTROVA REGION 

P: 22AUG2024 165760    55.0N  165.0E 4.0-6.0 BAAAA  Komandorsky Isl            

 

O: 25AUG2024 17:35:39  26.0N   90.8E ML=3.9  EMSC   MEGHALAYA, INDIA REGION      

P: 22AUG2024 165640    27.0N   92.0E 4.0-5.4 BAAAA  Myanmar                    

 

EMSC reported this earthquake of M 3.9 in India was felt with intensity up to IV in the area(s) of India in Adabari, Dugrasorabar, Athgaon, Kharghuli Hills.

 

INDONESIA AND PHILIPPINES

 

O: 25AUG2024 11:45:53   1.7N  127.3E mb=4.3  EMSC   HALMAHERA, INDONESIA

O: 26AUG2024 00:17:04   1.1N  126.4E MB=5.2  EMSC   MOLUCCA SEA                  

P: 25AUG2024 165578     1.0N  125.0E 4.0-5.4 AABAA  Mindanao, Philippines      

 

O: 25AUG2024 20:58:30   2.7N  127.1E ML=4.0  EMSC   MOLUCCA SEA                  

P: 23AUG2024 165576     2.0N  128.0E 4.0-5.4 AAAAA  Halmahera                  

 

O: 25AUG2024 21:34:32   4.5S   99.1E ML=4.1  EMSC   SOUTHWEST OF SUMATRA, INDONESI

P: 27AUG2024 165601     2.0S  100.0E 4.0-5.4 ACAAA  So. of Sumatera            

 

O: 25AUG2024 15:35:08   5.8S  147.1E MB=5.1  EMSC   EASTERN NEW GUINEA REG., P.N.G

P: 25AUG2024 165593     5.0S  151.0E 4.0-5.5 AAAAA  New Ireland                

 

NEIC reported this earthquake of M 5.1 in Papua New Guinea was felt with intensity up to IV in the area(s) of Papua New Guinea in Goroka Eastern Highlands.

 

O: 25AUG2024 09:21:24  10.1N   93.8E MB=4.7  EMSC   ANDAMAN ISLANDS, INDIA REGION

P: 21AUG2024 165608    10.0N   92.0E 4.0-5.4 BABAA  Andaman Islands            

P: 23AUG2024 165608    12.0N   92.0E 4.0-5.6 ABBAA  Andaman Islands            

 

O: 25AUG2024 22:12:29  14.8N  147.1E MB=4.8  EMSC   MARIANA ISLANDS REGION       

P: 24AUG2024 165629    14.0N  146.0E 4.0-5.4 AAAAA  So. Marianas/Guam          

 

 

CENTRAL AND SOUTH AMERICA

 

O: 26AUG2024 05:08:44   7.4N   82.3W MW=5.8  EMSC   SOUTH OF PANAMA              

P: 29AUG2024 165574     7.0N   82.0W 3.5-5.3 BAAAA  Costa Rica                  

 

O: 25AUG2024 16:07:18  10.6N   86.5W MB=4.8  EMSC   OFF COAST OF COSTA RICA      

P: 26AUG2024 165624    12.0N   87.0W 3.5-5.5 ABAAA  Nicaragua                  

P: 29AUG2024 165574     9.0N   86.0W 3.5-5.4 BBAAA  Costa Rica                  

 

O: 25AUG2024 16:37:49  13.0N   89.0W ML=4.1  EMSC   OFFSHORE EL SALVADOR         

P: 25AUG2024 165614    14.0N   90.0W 3.5-5.3 AAAAA  Guatemala                  

 

O: 26AUG2024 06:43:22  13.3N   89.6W ML=4.0  EMSC   OFFSHORE EL SALVADOR

O: 25AUG2024 23:30:11  13.2N   87.9W MB=4.4  EMSC   EL SALVADOR                  

P: 30AUG2024 165624    13.0N   87.0W 3.5-5.5 BAAAA  Nicaragua                  

 

O: 25AUG2024 23:16:54  15.6N   95.1W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

P: 27AUG2024 165612    15.0N   95.0W 3.5-5.1 AAAAA  Chiapas, Mexico            

 

O: 26AUG2024 03:26:46  15.8N   97.0W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

P: 26AUG2024 165627    16.0N   97.0W 3.5-5.3 AAAAA  Oaxaca, Mexico             

 

O: 25AUG2024 14:27:25  17.2N   96.4W MB=4.5  EMSC   OAXACA, MEXICO               

P: 23AUG2024 165612    17.0N   95.0W 3.5-5.1 AABAA  Chiapas, Mexico            

P: 26AUG2024 165627    16.0N   97.0W 3.5-5.3 ABAAA  Oaxaca, Mexico             

 

NEIC reported this earthquake of M 4.5 in Oaxaca, Mexico was felt with intensity up to V in the area(s) of Oaxaca, Mexico at Matatlan, IV in Santa Lucia del Camino, and II-III in Oaxaca, Huayapam, Puerto Escondido and in the state of Mexico at Tlalnepantla. 

 

O: 25AUG2024 21:35:08  18.5N   68.8W ML=3.2  EMSC   DOMINICAN REPUBLIC

O: 26AUG2024 05:16:09  17.9N   68.1W MB=4.6  EMSC   DOMINICAN REPUBLIC REGION    

P: 27AUG2024 165628    18.0N   67.0W 3.4-5.4 AAAAA  Puerto Rico                

 

O: 26AUG2024 00:18:48  18.1N   65.8W MD=3.0  EMSC   PUERTO RICO REGION           

P: 29AUG2024 165618    19.0N   65.0W 3.0-5.1 BAAAA  Leeward Islands            

 

O: 25AUG2024 11:56:42  18.4N   70.2W ML=3.6  EMSC   DOMINICAN REPUBLIC           

P: 29AUG2024 165632    20.0N   71.0W 3.0-4.9 BBAAA  Bahamas/No. Caribbean      

 

O: 25AUG2024 20:15:09  18.4N   73.6W ML=3.4  EMSC   HAITI REGION                 

P: 15AUG2024 165358    19.0N   72.0W 3.0-4.7 CABAA  Bahamas/No. Caribbean      

 

O: 25AUG2024 22:56:05  19.0N  105.2W ML=4.1  EMSC   OFFSHORE JALISCO, MEXICO

O: 25AUG2024 09:33:56  19.0N  105.2W ML=4.0  EMSC   OFFSHORE JALISCO, MEXICO     

P: 22AUG2024 165622    19.0N  104.0W 3.5-5.1 BAAAA  Michoacan, Mexico          

 

O: 25AUG2024 08:54:09  19.2N  102.5W ML=4.0  EMSC   MICHOACAN, MEXICO            

P: 22AUG2024 165622    19.0N  104.0W 3.5-5.1 BABAA  Michoacan, Mexico          

P: 26AUG2024 165622    18.0N  102.0W 3.5-5.2 ABAAA  Michoacan, Mexico          

 

O: 26AUG2024 00:24:10  19.2N   71.4W ML=3.0  EMSC   DOMINICAN REPUBLIC

O: 25AUG2024 20:59:30  19.4N   71.1W ML=3.2  EMSC   DOMINICAN REPUBLIC

O: 25AUG2024 16:41:11  19.6N   71.6W ML=3.1  EMSC   DOMINICAN REPUBLIC           

P: 29AUG2024 165632    20.0N   71.0W 3.0-4.9 BAAAA  Bahamas/No. Caribbean      

 

O: 25AUG2024 12:21:35  23.5S   67.1W ML=4.0  EMSC   JUJUY, ARGENTINA

O: 25AUG2024 17:47:42  23.6S   67.1W MB=4.4  EMSC   JUJUY, ARGENTINA             

P: 27AUG2024 165799    24.0S   66.0W 4.0-5.8 AAAAA  Argentina                  

 

O: 25AUG2024 09:38:57  25.2N  109.7W ML=3.9  EMSC   GULF OF CALIFORNIA           

P: 28AUG2024 165634    24.0N  109.0W 3.5-5.4 BBAAA  Gulf of California         

 

O: 25AUG2024 20:49:39  27.9N  112.1W ML=4.3  EMSC   GULF OF CALIFORNIA           

P: 18AUG2024 165362    28.0N  112.0W 3.5-4.9 CAAAA  Gulf of California          

 

O: 26AUG2024 06:21:09  32.2S   71.4W MW=4.6  EMSC   VALPARAISO, CHILE            

P: 27AUG2024 165814    34.0S   72.0W 4.0-5.7 ABAAA  Central Chile              

 

NEIC reported this earthquake of M 4.6 in Central Chile was felt with intensity up to IV in the area(s) of Central Chile in Valparaiso at Valparaiso, Vina del Mar, Villa Alemana and in Metropolitana in Santiago and San Bernardo.

EMSC reported strong shaking in Valparaiso, Chile at Puchuncavi, Quillota, Putaendo, Concon, Llaillay, Vina del Mar, Villa Alemana, Valparaiso, Colina, Lo Barnechea, Conchali, Pudahuel, Quinto Normal, Vitacura, Providencia, Las Condes, Santiago, Nunoa, Maipu, Macul, San Antonio, Santo Domingo, La Florida, San Bernardo, Puente Alto, Talagante, Ovalle.

GUC reportedd intensity IV in  Coquimbo at Illael, Los Vilos, Salamanca, Canela, Combarbala; III in Ovalle, Monte Patria, Punitaqui; in Valparaiso with V in Puchuncavi, Quintero and IV in San Antonio, Valparaiso; in Santiago with IV in Colina, Lampa, Tiltil; III in Macul, Buin, Paine, Penaflor; in O'Higgins with III in Rancagua, Codegua, Donihue, Machali, Las Cabras and Mostazal.

 

AFRICA AND EUROPE

 

O: 26AUG2024 04:11:39  38.1N    9.4W MB=5.4  EMSC   PORTUGAL                     

P: 13AUG2024 165401    37.0N   11.0W 3.5-4.9 DBBAA  Morocco/Spain              

 

O: 25AUG2024 23:56:35  63.9N   21.9W ML=3.4  EMSC   ICELAND REGION               

P: 23AUG2024 165778    63.0N   23.0W 3.0-4.6 AAAAA  Iceland area               

 

O: 25AUG2024 23:45:42  44.2N   11.5E ML=3.9  EMSC   NORTHERN ITALY               

P: 26AUG2024 165723    43.0N   13.0E 3.0-4.9 ABAAA  Italy                      

 

O: 26AUG2024 01:33:47  19.6S   33.8E ML=3.3  EMSC   MOZAMBIQUE                   

P: 27AUG2024 165806    22.0S   33.0E 4.0-5.8 ACAAA  So. Indian Ocean           

 

O: 25AUG2024 07:09:17  26.9S   26.6E ML=3.3  EMSC   SOUTH AFRICA                 

P: 28AUG2024 165804    26.0S   28.0E 3.0-4.9 AABAA  Rep. South Africa          

 

O: 26AUG2024 06:35:44  30.1S   28.8E ML=3.1  EMSC   SOUTH AFRICA                  

P: 28AUG2024 165804    26.0S   28.0E 3.0-4.9 ACAAA  Rep. South Africa          

 

SOUTHWEST PACIFIC

 

O: 25AUG2024 23:30:52  19.8S  175.0W mb=6.1  EMSC   TONGA

O: 25AUG2024 23:38:00  19.9S  175.2W mb=5.3  EMSC   TONGA

O: 25AUG2024 23:29:08  19.8S  175.1W MW=6.9  EMSC   TONGA                        

P: 25AUG2024 165809    21.0S  175.0W 4.0-5.7 ABAAA  Tonga Islands              

 

O: 25AUG2024 15:54:49  19.7S  177.3W MB=4.4  EMSC   FIJI REGION                  

P: 24AUG2024 165795    19.0S  177.0W 4.0-5.6 AAAAA  Tonga Islands              

 

OCEAN RIDGES

 

No significant (M>=5) or unusual earthquakes were reported on Ocean Ridges today.

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 25AUG2024 06:59:19  32.4S  150.9E ML=2.5  EMSC   NEW SOUTH WALES, AUSTRALIA

O: 25AUG2024 09:38:49  32.4S  150.8E ML=2.4  EMSC   NEW SOUTH WALES, AUSTRALIA

 

JAPAN AND KURIL ISLANDS

 

No earthquakes of M>=4 were located in Japan or the Kuril Islands today.

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 25AUG2024 21:16:59  30.7N  115.8W ML=3.1  EMSC   BAJA CALIFORNIA, MEXICO

O: 25AUG2024 21:59:22  30.7N  115.8W ML=3.2  EMSC   BAJA CALIFORNIA, MEXICO

O: 25AUG2024 22:15:03  30.8N  116.3W ML=3.1  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P: 30AUG2024 165691    32.1N  116.4W 2.5-4.6 BAAAA  So. California             

 

O: 25AUG2024 08:18:15  33.3N  116.4W ML=2.5  EMSC   SOUTHERN CALIFORNIA          

P: 30AUG2024 165691    32.1N  116.4W 2.5-4.6 BBAAA  So. California             

 

NEIC reported this earthquake of M 2.5 in Southern California was felt with intensity up to IV in the area(s) of Southern California in Borrego Springs, San Diego, Idyllwild.

 

O: 25AUG2024 11:00:28  38.7N  118.6W ML=2.1  EMSC   NEVADA                       

O: 25AUG2024 16:28:00  38.7N  118.6W ML=2.2  EMSC   NEVADA                       

P: 29AUG2024 165655    38.6N  118.6W 2.5-5.0 BAAAA  California/Nevada area     

 

O: 25AUG2024 16:56:47  38.8N  122.8W MD=2.2  EMSC   NORTHERN CALIFORNIA          

P: 23AUG2024 165659    38.9N  122.8W 2.5-4.7 AAAAA  Central California         

 

O: 26AUG2024 05:07:13  40.4N  124.5W MD=2.0  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 22AUG2024 165737    40.3N  124.7W 2.5-4.4 BAAAA  Off Coast of No. Calif     

 

 

ALASKA

 

O: 25AUG2024 20:48:57  54.4N  160.2W ML=3.6  EMSC   ALASKA PENINSULA             

P: 22AUG2024 165770    54.5N  161.8W 3.5-4.9 BAAAA  Unimak Islands, Aleutians  

 

O: 26AUG2024 04:20:01  59.0N  151.1W ML=3.2  EMSC   KENAI PENINSULA, ALASKA      

P: 31AUG2024 165773    60.1N  150.6W 3.2-5.1 BAAAA  Central Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

No events of M>=2 were located in the northwestern U.S. or western Canada today.

 

ROCKY MOUNTAINS REGION

 

O: 25AUG2024 15:27:01  31.6N  104.0W ML=2.0  EMSC   WESTERN TEXAS

O: 26AUG2024 01:55:40  31.6N  104.0W ML=3.0  EMSC   WESTERN TEXAS                

P: 24AUG2024 165688    31.2N  104.1W 2.0-3.9 AAAAA  SW U.S.A                   

 

EASTERN U.S./CANADA

 

O: 26AUG2024 02:46:47  35.0N   97.8W ML=2.0  EMSC   OKLAHOMA

O: 26AUG2024 00:12:26  35.0N   97.8W ML=2.5  EMSC   OKLAHOMA                     

P: 25AUG2024 165703    36.0N   97.0W 2.0-4.1 AAAAA  Southern Plains            

 

HAWAII

 

No earthquakes of M>=3 were located in Hawaii.

 

SERIES OF MODERATE QUAKES IN TONGA/FIJI WITH SOLAR FLARES

 

EARTHQUAKE SUMMARY FOR AUGUST 24, 2024

 

The strongest earthquake in the world today was an M 5.0 in Tonga/Fiji. This event was accompanied by a series of similar-sized earthquakes in the area, many of which occurred at the beginning of C- or M-class solar flares. This summary watches for concentrations of this type in the "FLARE" section of this summary because it may be that instability in a zone such as this may suggest a stronger regional earthquake is likely in the near future. At this writing it has been nearly a year since a significant earthquake in this area. These are sometimes promoted by regional passing meteorological storms but no strong storms are currently in the area. Following are some of the  events and associated solar flares today (Data from SWPC):

 

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

6450       0002   0014      0020   M1.6      (August 24, 2024)   8.7E-03  

Fiji M 4.6 00:49 UT

 

6470       0251   0257      0303   C6.9      (August 24, 2024)   2.4E-03  

Fiji M 4.5 02:50 UT

 

6600       1332   1337      1344   C3.8      (August 24, 2024)   9.1E-04  

Fiji M 4.9 13:32 UT

 

6720       1917   1930      1935   M1.4      (August 24, 2024)   1.3E-02  

Fiji M 5.0 19:51 UT

 

Many of today's events in Tonga and Fiji occurred within a minute of the beginning of solar flares whereas two followed M-class solar flares about 20-30 minutes later and may have been triggered by SFE with these flares.

 

Forecasts 165809 and 165546 had expected this activity in Tonga/Fiji was likely around August 19-21.

 

O: 24AUG2024 19:51:00  20.8S  179.0W mb=5.0  EMSC   FIJI REGION                  

P: 21AUG2024 165809    20.0S  178.0W 4.0-5.6 BAAAA  Tonga Islands              

 

O: 24AUG2024 13:31:39  23.4S  179.8W mb=4.9  EMSC   SOUTH OF FIJI ISLANDS        

P: 19AUG2024 165546    22.0S  179.0W 4.0-5.6 BBAAA  Tonga Islands              

 

O: 24AUG2024 00:49:04  20.5S  178.4W MB=4.6  EMSC   FIJI REGION                  

P: 21AUG2024 165809    20.0S  178.0W 4.0-5.6 BAAAA  Tonga Islands              

 

O: 24AUG2024 02:50:26  24.3S  179.9E MB=4.5  EMSC   SOUTH OF FIJI ISLANDS        

P: 29AUG2024 165811    25.0S  179.0E 4.0-5.6 BAAAA  Tonga/Fiji                 

 

The strongest earthquake in the U.S. or Canada today was an M 4.8 in Alberta, Canada near Fox Creek. This event may have been lightly felt in the epicentral area. It is the strongest earthquake located within about 200 km of today's epicenter since an M 5.0 on March 16, 2023 and prior to that events of M 4.9 and M 5.3 on November 29 and 30, 2022. At the time of the March, 16, 2023 events this summary noted in this regard:

 

 

"The strongest earthquakes in the U.S. or Canada today occurred as an M 4.5, 4.8 and 5.1 in Alberta, Canada. These were reported by NEIC with intensity V in Alberta in Grimshaw and IV in Peace River with II-III shaking in Falher, High Prairie, Fairview, Valleyview, Spirit River, Slave Lake, Fox Creek, Grand Prairie, Barrhead and Athabasca. These events are apparently aftershocks of an M 5.3 which hit the same epicenter on November 30, 2022. At the time this summary noted in this regard:

 

"The largest earthquake in the U.S. or Canada today was an M 5.3 in Alberta, Canada. The mainshock was felt widely in Alberta with maximum intensity IV in Peace River, Falher, High Prairie, Manning, Fairview, and III in Grimshaw, Valleyview, Slave Lake, Spirit River and Sexsmith. It was followed by an aftershock of M 4.5 which was reported felt with intensity IV in Alberta at Slave Lake, Whitecourt and II-III in Peace River, High Prairie, Fairview, Grande Prairie, Athabasca, High Leven and Wood Buffalo and in Dawson Creek, British Columbia. Foreshocks of M 4.6 and 4.9 to the M 5.3 was felt in the same area as the mainshock with maximum intensity IV in Alberta at Peace River, High Prairie, Spirit River, Sexsmith, Slave Lake and in Dawson, BC.  This activity is a continuation of events which hit the area on November 22-24, 2022. That included an M 4.5 which previous to the M 5.3 today was the largest earthquake in the area in more than 35 years ..." (March 16, 2023)

 

Forecast 165751 had expected enhanced seismicity within about 250 km of this epicenter in Alberta was likely around August 21.

 

O: 24AUG2024 12:50:09  54.5N  117.5W MB=4.8  ECAN W OF FOX CREEK, AB 

O: 24AUG2024 12:50:11  54.6N  117.3W mb=4.2  EMSC   ALBERTA, CANADA              

P: 21AUG2024 165751    56.0N  120.0W 2.0-4.0 BBBAA  Alberta                     

 

MODERATE AFTERSHOCKS CONTINUE IN NEW SOUTH WALES, AUSTRALIA

 

EARTHQUAKE SUMMARY FOR AUGUST 23, 2024

 

 

A second earthquake of M 4.8 occurred in the Denman area of New South Wales today. This follows a similar event reported in this summary in the previous issue as:

 

"An unusually large earthquake of M 4.8-5.0 occurred today in New South Wales, Australia. NEIC reported it was felt in New South Wales with maximum intensity V in Muswellbrook and II-III in Singleton, Cessnock, Kurri Kurri, Raymond Terrace, Wang-Rathmines, Newcastle, Lemon Tree Passage, Mudgee, Richmond-Windsor, Tamworth, Lawson-Hazelbrook, Katoomba-Wentworth, Forster-Tuncurry, Taree, Gunnedah, Sydney, Orange and Port Macquarie. EMSC reported houses shook violently in Muswellbrook, NSW, Australia with moderate to strong shaking in Newcastle, Maitland, Windeyer, Sydney, Internet reports indicated slight damage with broken glass and plaster breakage in the epicentral area." (August 23, 2024)

 

Today's earthquake was followed by a number of light aftershocks which were felt in the epicentral area. NEIC reported today's event was felt with maximum intensity V in New South Wales at Forster-Tuncurry and IVin Kurri Kurri and Muswellbrook and II-III in Cessnock, Mudgee, Newcastle, Richmond-Windsor, Nelson Bay, Katoomba-Wentworth Falls, Camden, Haven. EMSC reported a loud rumble at Muswellbrook.

 

Today's mainshock  (see previous summary) in  New South Wales may have been triggered by a Solar Flare (#6020). This flare was first observed within a minute of the earthquake in Australia where it was within several minutes of local solar noon at the time of the flare and earthquake. These are ideal conditions for Solar Flare Effects to trigger seismicity. Today's aftershock of M 4.8 also occurred with a strong solar flare (#6510  and 6490) where were a strong radio flare and a C4.2 which respectively began and maximized at the time of the M 4.8 in Australia and were likely promoted by SFE. Following is data from SWPC for this flare:

 

 

Flare #    START  MAX       END    CLASS     DATE    Flux (Jm-2)

-------------------------------------------------------------------------

 

6020       0203   0210      0219   C5.9      (August 23, 2024)   5.3E-03  

New South Wales, Australia M 4.8 02:02 UT

 

6510       0610   0624      0634   C4.2      (August 24, 2024)   5.8E-03  

6490       0631   ////      1724   CTM1      (August 24, 2024)   5.8E-03  

New South Wales, Australia M 4.8 06:31 UT

 

O: 23AUG2024 16:26:28  32.4S  150.9E ML=2.5  EMSC   NEW SOUTH WALES, AUSTRALIA

O: 23AUG2024 18:57:42  32.4S  150.9E ML=2.5  EMSC   NEW SOUTH WALES, AUSTRALIA

O: 23AUG2024 23:13:55  32.4S  150.9E ML=2.6  EMSC   NEW SOUTH WALES, AUSTRALIA

O: 24AUG2024 05:56:01  32.4S  150.9E ML=2.5  EMSC   NEW SOUTH WALES, AUSTRALIA

O: 24AUG2024 06:31:39  32.4S  150.8E ML=4.8  EMSC   NEW SOUTH WALES, AUSTRALIA

O: 24AUG2024 06:43:05  32.4S  150.9E ML=2.7  EMSC   NEW SOUTH WALES, AUSTRALIA

O: 24AUG2024 03:06:01  32.5S  150.9E ML=2.7  EMSC   NEW SOUTH WALES, AUSTRALIA

O: 23AUG2024 15:10:20  32.4S  150.9E ML=3.2  EMSC   NEW SOUTH WALES, AUSTRALIA   

O: 23AUG2024 02:01:59  32.4S  150.9E Mw=4.8  EMSC   NEW SOUTH WALES, AUSTRALIA

O: 23AUG2024 02:15:44  32.3S  150.9E ML=2.9  EMSC   NEW SOUTH WALES, AUSTRALIA   

 

 

A moderate earthquake of M 4.3 occurred today in the area of Nevada near the Central California border. It was followed by a series of light, felt aftershocks. NEIC reported this activity was felt with intensity up to IV in Nevada at Reno and Hawthorne. NEIC reported the mainshock with intensity VI-V in Nevada at Hawthorne, and II-III in Schurz, Wellington, Fallon, Carson City, an Tonopah and in California at Sonora, Twain Harte, El Portal, Arnold, Yosemite National Park, Coleville among others. The mainshock was accompanied by a series of felt but light foreshocks. Today's M 4.3 is the strongest earthquake within about 100 km of today's epicenter since an M 4.5 two years ago on August 8, 2022 and a year before that on August 27, 2021. in the August, 2022 issue of this summary, it was noted in this regard:

 

"The M 4.4-4.6 on the border between Central California and Nevada today occurred within minutes of local solar noon and was probably promoted by high tidal/geomagnetic effects which maximize near this hour as well. NEIC reported it was felt with intensity II-III in California at Topaz, Coleville, Gardnerville, Markleeville, Bridgeport and in Nevada at Wellington, Smith, Gardnerville, Minden among others. NEIC reported aftershocks of M 2.5-3.5 in Central California were felt with intensity II-III in the area(s) of  in Carson City, Nevada. The M 4.4-4.6 is the strongest aftershock of the M 6.0 which shook the area on July 8, 2021 since that date." (August 8, 2022)

 

These events are still more than 50 km from today's epicenter. The last within this range was an M 5.7 and 5.5 on December 28, 2016.

 

Forecasts 165383 and had expected a moderate earthquake in this area was likely around August 18-29 within about 10 km of this event.

 

O: 23AUG2024 14:06:19  38.7N  118.7W ML=2.1  EMSC   NEVADA

O: 23AUG2024 14:51:22  38.7N  118.6W ML=3.2  EMSC   NEVADA

O: 23AUG2024 15:03:40  38.7N  118.6W ML=2.1  EMSC   NEVADA

O: 23AUG2024 15:31:58  38.7N  118.6W Mw=4.3  EMSC   NEVADA

O: 23AUG2024 15:35:30  38.7N  118.6W ML=2.1  EMSC   NEVADA

O: 23AUG2024 15:39:36  38.7N  118.6W ML=2.3  EMSC   NEVADA

O: 23AUG2024 15:59:44  38.7N  118.6W ML=2.8  EMSC   NEVADA

O: 23AUG2024 16:32:46  38.7N  118.6W ML=2.0  EMSC   NEVADA

O: 23AUG2024 23:20:16  38.7N  118.6W ML=2.5  EMSC   NEVADA

O: 23AUG2024 23:33:11  38.7N  118.6W ML=2.1  EMSC   NEVADA

O: 24AUG2024 02:02:28  38.7N  118.6W ML=2.0  EMSC   NEVADA

O: 24AUG2024 02:29:27  38.7N  118.6W ML=2.5  EMSC   NEVADA

O: 24AUG2024 04:14:00  38.7N  118.6W ML=3.2  EMSC   NEVADA

O: 24AUG2024 04:19:18  38.7N  118.6W ML=2.7  EMSC   NEVADA

O: 24AUG2024 04:25:09  38.7N  118.6W ML=2.2  EMSC   NEVADA

O: 23AUG2024 13:43:06  38.7N  118.6W ML=3.0  EMSC   NEVADA                       

O: 24AUG2024 05:56:33  38.7N  118.8W ML=2.1  EMSC   NEVADA                       

O: 23AUG2024 21:12:09  38.8N  118.6W ML=2.1  EMSC   NEVADA                        

P: 18AUG2024 165383    38.6N  118.6W 2.5-4.8 CAAAA  California/Nevada area     

P: 29AUG2024 165655    38.6N  118.6W 2.5-5.0 CAAAA  California/Nevada area     

 

 

 

 

UNUSUAL MODERATE QUAKE SHAKES NEW SOUTH WALES, AUSTRALIA

 

EARTHQUAKE SUMMARY FOR AUGUST 22, 2024

 

 

An unusually large earthquake of M 4.8-5.0 occurred today in New South Wales, Australia. NEIC reported it was felt in New South Wales with maximum intensity V in Muswellbrook and II-III in Singleton, Cessnock, Kurri Kurri, Raymond Terrace, Wang-Rathmines, Newcastle, Lemon Tree Passage, Mudgee, Richmond-Windsor, Tamworth, Lawson-Hazelbrook, Katoomba-Wentworth, Forster-Tuncurry, Taree, Gunnedah, Sydney, Orange and Port Macquarie. EMSC reported houses shook violently in Muswellbrook, NSW, Australia with moderate to strong shaking in Newcastle, Maitland, Windeyer, Sydney, Internet reports indicated slight damage with broken glass and plaster breakage in the epicentral area. This earthquake is near the antipode of Hurricane Ernesto currently near the Azores in the North Atlantic and may have been promoted by antipodal energy focusing from that storm which was described in this summary on August 19 as:

 

"Hurricane Ernesto continued in the North Atlantic today east of Maine and Nova Scotia with winds up to 80 kts. It is expected to track into the North Atlantic and not to have significant effect on regional seismicity until it reaches the Northern Mid-Atlantic and Reykjanes ridges where stresses from this storm may promote a moderate to large regional ridge earthquake. Some enhanced seismicity in northern Europe could occur after it enters that region." (August 19, 2024)

 

Today's M 4.8 in New South Wales is the strongest in the New South Wales area within about 300 km of today's epicenter since an M 5.4 on August 6, 1994.

 

O: 23AUG2024 02:01:59  32.4S  150.9E Mw=4.8  EMSC   NEW SOUTH WALES, AUSTRALIA

O: 23AUG2024 02:15:44  32.3S  150.9E ML=2.9  EMSC   NEW SOUTH WALES, AUSTRALIA   

 

The strongest earthquake located in the U.S. or Canada today was an M 4.7 in Hawaii. NEIC reported maximum shaking of IV was felt in Hawaii at Pahoa with intensity II-III at Volcano, Mountain View, Hawaii National Park, Kurtistown, Keaau, Hilo, Pahala, Papaikou, Pepeekeo, Hakalau, Honomu, Papaaloa, Naalehu, Paauilo, Laupahoehoe, Captain Cook, Holualoa, Kealakekua, Honokaa, Kamuela, Kailua Kona, Kapaau, Kualapuu, Honolulu and Waimea. EMSC reported it at M 4.7 was felt with moderate jolt in Volcano, Eden Roc, Mountain View, Pahoa, Keaau, Hilo, Pepeekeo. Several hurricanes are currently located near Hawaii and the impact of low pressures with these storms may have helped trigger today's M 4.7 in Hawaii as noted in this and previous summaries:

 

"TS Hone  formed southeast of Hawaii today in the north Pacific with winds up to 50 kts  It is expected to track towards Hawaii in the next several days passing to the south of the big Island of Hawaii. Seismicity has increased in Hawaii perhaps indicating a new upcoming eruption which could be triggered by low pressures with TS Hone." (August 22-23, 2024)

 

This is the strongest earthquake in Hawaii since an M 5.7 on February 9, 2024.  At the time this summary noted:

 

"The strongest earthquake in the U.S. or the world today was an M 5.7 in the Mauna Loa region of Hawaii (initially given as M 6.3). NEIC reported it was felt as far as Honolulu and throughout the island of Hawaii with intensity up to VII. Foreshocks of M 2.9 and 3.0 were also reported felt in Pahala, Hawaii with intensity up to IV.  EMSC reported strong to violent shaking in Hawaii at Naalehu, Mountain View (with oud earthquake nose) Kealakekua, Fern Acres, Keaau, Pahoa, Hilo, Kailua Kona, Pepeekeo, Honokaa, Wailea, Wailuku, Maui, Lahaina, Honolulu, Kailua, Kaneohe. Minor damage which included items being thrown from shelves and minor damage to structures was reported which included cracked walls. This is the strongest earthquake in Hawaii since an M 6.2 on October 10, 2021 and an M 6.9 on May 4, 2018 - the largest in Hawaii in the past 35 years. the only other event in Hawaii with M>=6.2 in this time period was an M 6.7 on October 15, 2006." (February 9, 2024)

 

 

Forecast 165616 had expected today's event within about 25 km was likely

around August 21, 2024.

 

O: 22AUG2024 10:52:44  19.3N  155.1W ML=4.7  EMSC   ISLAND OF HAWAII, HAWAII     

P: 21AUG2024 165616    19.3N  155.3W 3.0-4.6 AAAAA  Hawaii (Eruption)          

 

The strongest earthquakes in the world today were a pair of events of M 5.5 each in the Indian Ocean south of Africa. They were not felt in this remote area. This epicenter is at the antipode of the Unimak and Alaska Peninsula and could enhance seismicity in that area in the next several days.  A strong M 6.7 hit about 250 km east of this epicenter on July 10, 2024 but the last within this distance from today's event of equal or larger magnitude was an M 5.5 on December 12, 2021. At the time of the M 6.7 in July, 2024 this summary noted:

 

"The strongest earthquake in the world today was an M 6.7 south of Africa. This event was not reported felt in this remote area and is the second strongest in the world since an M 7.2 in Taiwan on April 2, 2024; an M 6.7 in the northern Marianas on April 5, 2024 and a similar M 7.2 in Southern Peru on June 28, 2024. This is the strongest earthquake in this region south of Africa in more than 35 years. Smaller events in the region east of this epicenter occurred with M 6.1 on December 22, 2023; September 28, 2004 (M 6.4) and March 11, 1991 (M 6.4.). " (July 10, 2024)

 

Forecast 165827 had expected enhanced seismicity within about 250 km of today's epicenter was likely at the end of August.

 

O: 23AUG2024 04:45:18  53.0S   21.1E mb=5.5  EMSC   SOUTH OF AFRICA

O: 23AUG2024 04:48:57  52.9S   21.1E mb=5.5  EMSC   SOUTH OF AFRICA              

P: 29AUG2024 165827    53.0S   19.0E 4.0-5.9 CABAA  Atlantic-Indian Ridge      

 

The current volcanic eruption south of Reykjavik, Iceland continued today. Among a number of lightly felt earthquakes today an M 3.4 was felt with strong shaking in Iceland at Reykjanesbaer, Kopavogur and Reykjavik. This continues a strong series of volcanic events in the world associated with the full moon of August 19 as noted in the previous issue of this summary:

 

"A series of volcanic eruptions occurred over the past several days. These were closely associated with tidal stresses associated with the full moon of August 20, 2024. The effects of these stresses had been noted in previous issues of this summary as likely:

 

"The full moon arrives at 18:26 UT on August 19, 2024.   Longitudes which are at local solar midnight at this time are near 85 East while those at local solar noon are near 95 West. These include areas of central North America and the East Pacific in the west and central Asia including China, India, Nepal in the East. These areas are most likely to see moderate tidal triggering at this time. Tidal enhancement of regional seismicity is possible in many areas, however, a major earthquake associated with this new moon is considered possible in the next week by this report." (August 19-21, 2024)

 

Forecast 165778 had expected this eruption at this time was likely within about 100 km around August 23.

 

O: 22AUG2024 21:47:26  64.3N   23.6W ML=3.2  EMSC   ICELAND REGION

O: 22AUG2024 22:37:38  63.9N   22.3W ML=3.5  EMSC   ICELAND REGION               

P: 23AUG2024 165778    63.0N   23.0W 3.0-4.6 AAAAA  Iceland area               

 

A strong eruption occurred in Volcan de Fuego at the time of the full moon. This

volcano is in Antigua, Guatemala. at 14.4N 90.9W. In addition a volcano south of Reykjavik, Iceland; several in the area of Indonesia, several in Kamchatka, Russia also were in continuing eruptions. Other areas where seismicity may indicate fresh upcoming eruptions included the Canary Islands and Hawaii." (August 22, 2024)

 

 

 

VOLCANISM INCREASES WITH FULL MOON

 

EARTHQUAKE SUMMARY FOR AUGUST 21, 2024

 

A series of volcanic eruptions occurred over the past several days. These were

closely associated with tidal stresses associated with the full moon of August 20, 2024. The effects of these stresses had been noted in previous issues of this summary as likely:

 

"The full moon arrives at 18:26 UT on August 19, 2024.   Longitudes which are at local solar midnight at this time are near 85 East while those at local solar noon are near 95 West. These include areas of central North America and the East Pacific in the west and central Asia including China, India, Nepal in the East. These areas are most likely to see moderate tidal triggering at this time. Tidal enhancement of regional seismicity is possible in many areas, however, a major earthquake associated with this new moon is considered possible in the next week by this report." (August 19-21, 2024)

 

A strong eruption occurred in Volcan de Fuego at the time of the full moon. This

volcano is in Antigua, Guatemala. at 14.4N 90.9W. In addition a volcano south of Reykjavik, Iceland; several in the area of Indonesia, several in Kamchatka, Russia also were in continuing eruptions. Other areas where seismicity may indicate fresh upcoming eruptions included the Canary Islands and Hawaii.

 

The strongest earthquake in the world today was an M 5.4 aftershock of the M 7.0 in Kamchatka which occurred on August 17. EMSC reported today's event was felt with moderate shaking in Kamchatka, Russia at Petropavlovsk, Vilyuchinsk, Yelizovo. At the time of the mainshock this summary noted:

 

 

"A major earthquake occurred today in the area of Kamchatka. A tsunami warning  was issued but major waves were not observed. This earthquake was followed shortly afterwards by a major volcanic eruption of Sheveluch Volcano which endangered the lives of a number of unauthorized hikers. This eruption caused air traffic and placed the region off limits to residents and visitors. NEIC reported the earthquake was felt with strong intensity (and minor damage)

in Kamchatka with intensity VIII in Oetropavlovsk, and VI in Mohovaja and Jelizovo, Russia. EMSC added the quake was felt strongly in Kamchatka at Pionerskoye, Yelizovo, Razdol'nenskoye, Ust'-Kamchatskoye. Immediate moderate aftershocks of M 4.5, 4.6 and 5.0 were also moderately felt in Kamchatka. Russian news outlets reported residents noted it was "the strong shaking in a long time". No major damage has been reported but some minor damage was reported in the area.

 

The only report of a tsunami with this earthquake was from a gauge in the north Pacific which measured a maximum tsunami height of 00.25 meters." (August 18, 2024)

 

Forecast 165757 had expected this earthquake was likely in later August within  about 100 km of these epicenters.

 

O: 21AUG2024 09:30:34  52.4N  162.2E MB=4.0  EMSC   OFF EAST COAST OF KAMCHATKA  

O: 21AUG2024 08:43:32  52.6N  161.1E mb=4.3  EMSC   OFF EAST COAST OF KAMCHATKA

O: 21AUG2024 08:25:16  52.7N  160.9E mb=4.7  EMSC   OFF EAST COAST OF KAMCHATKA

O: 21AUG2024 23:30:35  52.9N  160.1E mb=5.4  EMSC   OFF EAST COAST OF KAMCHATKA

P: 28AUG2024 165757    52.0N  161.0E 4.0-5.4 CAAAA  E. of Kamchatka            

 

O: 21AUG2024 14:17:22  54.4N  161.5E MB=4.3  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 23AUG2024 165757    55.0N  160.0E 4.0-6.0 AAAAA  E. of Kamchatka            

 

O: 21AUG2024 17:45:36  51.2N  157.8E MB=4.5  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 21AUG2024 165759    53.0N  158.0E 4.0-5.7 ABAAA  Kamchatka                  

 

The strongest earthquake in the U.S. or Canada today was an M 3.8 in Southern Alaska. NEIC reported this earthquake of M 3.8 in Southern Alaska was felt with intensity up to II-III in the area(s) of Southern Alaska in Valdez, Eagle River, Chugiak and Anchorage.   The last earthquake within about 100 km of this epicenter with M>=3.8 occurred as an M 3.8 about 100 km west of this on July 31, 2024.

 

Forecast 165774 had expected today's event within about 50 km was likely around

August 22.

 

O: 22AUG2024 02:40:21  61.3N  147.0W ML=3.8  EMSC   SOUTHERN ALASKA              

P: 22AUG2024 165774    60.6N  147.6W 3.2-5.0 AAAAA  Central Alaska             

 

An earthquake of M 3.6 also occurred today in the area of southeastern Alaska near Juneau and was followed by an M 3.0 aftershock near local solar noon. This may have been promoted by tidal stresses with the full moon which maximize near this hour. Forecast 165756 had expected activity within about 50 km  of this epicenter would be enhanced around August 20-22.

 

O: 20AUG2024 21:28:58  58.3N  132.4W MB=3.0  ECAN OF JUNEAU, AK                  

O: 20AUG2024 17:50:09  59.0N  134.6W MB=3.6  ECAN OF JUNEAU, AK                  

P: 22AUG2024 165756    58.3N  133.5W 3.0-5.4 AAAAA  British Colombia           

 

MODERATE QUAKE NEAR GREENLAND ON QUIET DAY

 

EARTHQUAKE SUMMARY FOR AUGUST 11, 2024

 

 

It was a quiet day in global seismicity today. The only notable earthquake, andthe largest event in the world was an M 5.1 in Greenland north of Norway. This is the largest earthquake in the Greenland Sea since an M 5.5 on July 23, 2021 and the largest within about 200 km since an M 5.5 on December 13, 2023. At

the time this summary noted:

 

"The strongest earthquakes in the world today occurred in the Norwegian Sea with M 5.5 and 5.3. These events were not reported felt in this remote region. They occurred at a longitude where tidal stresses associated with the new moon of December 12 were strongest as noted in this summary in previous issues

 

...

 

The last earthquake within about 300 km of today's epicenter in the Norwegian Sea with M>=5.5 occurred three years ago with M 5.8 on December 14, 2020. This occurred with a solar eclipse and an M 4.8 in Nevada and an M 6.0 in  Antofagasta, Chile. At the time this summary noted:

 

 

"A moderately strong earthquake of M 5.8 also hit in the Norwegian Sea today. It was not reported felt in this remote area. The last earthquake within about 200 km of this epicenter of equal or larger magnitude was an M 6.7 pm November 9, 2018 and closer to this epicenter an M 6.2 on May 24, 2012." (December 14, 2020, December 13, 2023)

 

 

In the July 23, 2021 issue of this summary it was noted:

 

 

"The strongest earthquake in the world today was an M 5.5 in the Greenland Sea. It was not reported felt in this remote area. It may have been promoted by the minor geomagnetic storm at high latitudes which occurred today, the strongest in more than a month. This summary noted this possibility as:

 

...

 

A slightly smaller event at this epicenter in the Greenland Sea occurred on March 23, 2021. At the time this summary noted:

 

"The M 5.3-5.4 in the Greenland Sea is the largest in that area within about 300

km of this epicenter since an M 5.6 on February 8, 2018 and prior to that an M 6.5 on March 5, 2009." (March 24, 2021, July 23, 2021)

 

This continued enhanced seismicity in in the area of Greenland as reported in

the previous issue of this summary:

 

 

"The largest and most unusual earthquake in the vicinity of the U.S. or Canada today was an M 4.5 in Western Greenland. A series of events of M 4.5-4.6 hit this area of Greenland in January, 2022 and December, 2022 and January 2023 but the only event in the area with significantly larger magnitude in the past 35 years was an M 5. on October 14, 1998." (August 10, 2024)

 

Forecast 165520 had expected today's event within about 100 km was likely around August 13, 2024.

 

O: 12AUG2024 01:08:35  74.8N    8.4E MB=5.1  EMSC   GREENLAND SEA                

P: 13AUG2024 165520    74.0N   14.0E 3.0-4.4 AAAAA  Norway                      

 

The strongest earthquake in the U.S. or Canada today was an M 3.8 in Central

California. The last earthquake of M>=3.8 within about 100 km of today's epicenter occurred on April 16, 2024 with M 3.8-3.9 but the last event in the region of larger magnitude was an M 4.6 on July 15, 2022. At the time this summary noted:

 

"The strongest earthquake in the U.S. or Canada today was an M 4.6 in the Ridgecrest area of Central California. NEIC reported this earthquake of M 4.6 in the California-Nevada border region was felt with intensity II-III in the area(s) of the California-Nevada border region with IV in Ridgecrest and Trona and lesser shaking in Inyokern, Weldon, Lake Isabella, Bodfish, Caliente, East Tulare County, Mojave and Wofford Heights. This is the strongest earthquake within about 100 km of this epicenter since an M 4.8  on August 19, 2020 - an aftershock of an M 5.8 on June 24, 2020. A series of moderate to strong earthquake began in this area of Ridgecrest in July 4 and 6, 2019 with M 6.4 and M 7.1 among many other moderate associated shocks. Today's event was likely triggered by high tidal stresses with the full moon of July 13" (July 15, 2022)

 

 

Forecast 165427 had expected today's event within about 10 km was likely around August 11.

 

O: 11AUG2024 09:46:04  36.0N  117.7W ML=3.0  EMSC   CENTRAL CALIFORNIA

O: 11AUG2024 09:45:12  35.9N  117.7W MW=3.8  EMSC   CENTRAL CALIFORNIA           

P: 11AUG2024 165427    35.9N  117.7W 2.5-4.8 AAAAA  So. California             

 

An unusual earthquake of M 2.4 also occurred today in Illinois. It was not reported felt in the epicentral area. This is the largest earthquake in Illinois within about 100 km of this epicenter since an M 2.5 on June 16, 2022. At the time this summary noted:

 

 

"An unusual earthquake of M 2.5 occurred today in eastern Illinois. NEIC reported it was felt in Illinois in Calhoun, Parkersburg, Olney, Sumner, Mount Carmel, Albion, Effingham and in Indiana at Princeton and Elletsville. This is the strongest earthquake in eastern Illinois within about 100 km of this epicenter since an M 3,8 on September 19, 2017 and an 3.4 on May 30, 2015. More recent earthquakes  in the area of M 2.4-2.5 occurred on May 17 and April 13, 2022." (June 16, 2022)

 

Forecast 165403 had expected today's event in Illinois within about 50 km  was likely in mid-August. This epicenter is at 103 degrees from the M 7.1 in Kyushu and was probably promoted by energy from that source. A similar event of M 2.2 in Virginia today was also at this distance from Kyushu, Japan. Forecast 165398 had expected this event around August 12.

 

O: 11AUG2024 03:10:39  38.1N   88.4W MD=2.4  ANSS   WSW OF ENFIELD ILLINOIS      

P: 14AUG2024 165403    38.0N   87.0W 2.0-4.3 BAAAA  New Madrid area            

P: 18AUG2024 165403    38.0N   89.0W 2.0-4.1 CAAAA  New Madrid area            

 

O: 11AUG2024 08:44:40  37.3N   80.6W MD=2.2  EMSC   VIRGINIA                     

P: 12AUG2024 165398    37.2N   81.9W 2.0-4.2 AAAAA  Kentucky/Tennessee/NC      

 

 

UNUSUAL, MODERATE QUAKE SHAKES ROMANIA

 

EARTHQUAKE SUMMARY FOR AUGUST 10, 2024

 

The most unusual earthquake in the world today occurred today as an M 4.4 in Romania. NEIC reported this earthquake of M 4.4 in Romania was felt with intensity up to IV in the area(s) of Romania in Arad at Savarsin (V); Bata Birchis and Inew and in Deva Hunedoara, and in Cluj at Savadisla, Floresti, Cluj-Napoca, Apahida and as far as Bucharest. EMSC reported moderate shaking in Romania at Varadia de Mures, Julita, Temeresti, Lugoj, Lipova, Buzard, Zabrani, Siria, Cicir, Horia, Bocsig, Santana, Arad among others. This is the strongest earthquake Romania within about 200 km of this shallow focus event since an M 4.5 on August 20, 2023 - an aftershock of an M 5.5 on February 14, 2023.

At that time this summary noted:

 

"No earthquakes of greater magnitude have occurred in southern Romania in at least 35 years. The last earthquakes of M 5.5-5.6 within about 200 km of today's epicenter hit west of this in Serbia on July 12 and 18, 1991. This activity is at 145-150 degrees from the strong earthquakes in the Tonga and Fiji areas in November and December, 2022 and at 105 degrees from the M 6.8 in Argentina of January 20, 2023 and at 100 degrees from the M 7.6 in Michoacan, Mexico of September 19, 2022 and  was probably promoted by energy from those sources." (February 14, 2023)

 

Forecasts 165443 and 165472 had expected regional seismic enhancement in

the area of Romania around August 11, 2024.

 

O: 10AUG2024 20:46:02  45.9N   22.0E ML=4.7  EMSC   ROMANIA                      

P: 11AUG2024 165443    45.0N   18.0E 3.0-5.6 AACAA  Adriatic Sea               

P: 11AUG2024 165472    41.0N   21.0E 3.0-5.4 ACAAA  Romania/NW Turkey          

 

The strongest earthquake in the world today was an M 5.2 in the area southeast of the Loyalty Islands. This continues seismic enhancement in this region as noted in the previous issue of this summary:

 

 

"A series of moderate to moderately large earthquakes occurred in the Tonga/Fiji/Kermadec Islands today. These included an M 5.9 in the Kermadec Islands and an M 5.6 in Fiji. None of these were reported felt in this remote region. The earthquake of M 5.9 in the Kermadec Islands occurred within minutes of local solar midnight and was probably promoted by strong tidal stresses at this hour. It is near the longitude of maximum tidal stress with the previous new moon and was probably also affected by this alignment. This summary had noted this possibility in previous issues as:

 

"The new  moon arrived on August 4, 2024 at 11:13 UT.  Longitudes which were at local solar noon at this time are located at about 15 East while those at local solar midnight are near 165 West. In the east these include most of western Europe and Iceland and the Atlantic Ridge while in the west areas of the western Aleutians, Alaska, Hawaii, Tonga/Fiji/New Zealand and portions of the Pacific-Antarctic Ridge are included. These are the most likely areas to see significant tidal triggering with this new moon. Other areas may also see tidal promotion in the next week especially at times of large solar flares and near local solar midnight and solar noon. The likelihood of a strong associated earthquake with this new  moon are considered  moderate to  high in the next week (August 1-10, 2024)." (August 3-10, 2024)

 

Forecast 165539 had expected today's activity in the Loyalty Islands around

August 11-15.

 

O: 10AUG2024 14:34:02  23.1S  170.6E MB=5.2  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 11AUG2024 165539    22.0S  170.0E 4.0-5.6 ABAAA  Loyalty Islands            

P: 15AUG2024 165539    23.0S  170.0E 4.0-5.4 BAAAA  Loyalty Islands