STRONG SOLAR FLARES TRACK SIGNIFICANT EARTHQUAKES

 

EARTHQUAKE SUMMARY FOR OCTOBER 2, 2022

 

Several large solar flares occurred today. The first of these was an M6.7 (SWPC #6640) starting about 02:08 UT and peaking about 02:21 UT. (see table below). The second was an X1.0 (#6890) starting about 19:53 UT and peaking at about 20:25 UT. Larger solar flares preceded flare #6640  this year as an X2.2 on April 20, 2022, the strongest in the past 2 years and a series in late April of X1.1. These are the strongest flares in more than a month - since an M8.6 on August 29, 2022 (#8110). Following are the parameters for these events. A more complete listing from  SWPC is located in the "External Effects) section of this and all summaries.

 

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

#-------------------------------------------------------------------------------

 

6640       0208   0221      0226   M8.7      (October 2, 2022)   3.6E-02  

6860       1723   1734      1753   C3.6      (October 2, 2022)   2.5E-03  

6880       1849   1908      1925   C8.1      (October 2, 2022)   1.4E-02  

6890       1953   2025      2034   X1.0      (October 2, 2022)   8.6E-02  

 

 

An M 5.5 occurred in the region of the Mariana Islands north of Guam today. It was not reported felt in this remote region. This earthquake occurred within minutes of local solar noon shortly after an M8.6 class solar flare began and near the height of this flare. Aftershocks of M 4.8 and 5.4  occurred at the end of Solar flare #6870, and was also possibly promoted by SFE. Solar Flare Effects (SFE) is maximized at local solar noon and this is a classic example of a moderately large quake triggered by SFE at local solar noon. A similar M 5.4 hit this area of the Mariana Islands on October 1 and occurred at the beginning of flare #6320, a C-class flare. The M 5.5 is the strongest earthquake in the current swarm which began with a pair of M 5.1 events on September 28. It is the strongest earthquake within about 200 km of this epicenter in the past two years. The last earthquake of larger magnitude was an M 5.6 on August 3, 2020. An M 6.4 occurred south of this on August 28, 2018 and these may be long-term aftershocks of that event.

 

Forecast 147098 had expected this activity was likely within about 100 km around October 4. This activity is at 102-103 degrees from the M 7.6 in Michoacan, Mexico of September 19, 2022 and may have been promoted by energy from that source. 

 

O: 02OCT2022 18:27:30  17.0N  147.2E mb=4.8  EMSC   MARIANA ISLANDS REGION

O: 02OCT2022 18:31:16  17.1N  147.1E mb=5.4  EMSC   MARIANA ISLANDS REGION

O:  2OCT2022 02:14:41  17.0N  147.1E Mw=5.5  EMSC   MARIANA ISLANDS REGION       

P:  4OCT2022 147098    17.0N  146.0E 4.0-5.5 AAAAA  No. Marianas               

 

The X1.0 solar flare was accompanied by an M 5.3 earthquake in Taiwan. NEIC reported this earthquake was felt with intensity II in Nantou, Taiwan. CWB reported this earthquake with M 5.3 was felt with intensity IV in Hualien, III in Nantou, Taitung, Yunlin, ; II in Miaoli, Pingtung, Yilan, Taichung, Changhua, I in Taipei, Miaoli, Taoyuan, Tainan, Hsinchu, Kaohsiung, Counties, Taiwan. This is not a classical aftershock of the M 6.9 in Taiwan of September 18, 2022 as it occurred about 100 km northeast of that epicenter. It is the strongest event in Taiwan since an M 5.5 on September 18, 2022.  This earthquake occurred at the exact energy peak of flare 6890 and was probably triggered by SFE. Forecast 146870 expected today's activity in Taiwan was likely in late September or early October within about 100 km.

 

O:  2OCT2022 20:25:22  23.5N  121.5E ML=5.3  TAI    Hualien, Taiwan              

O:  2OCT2022 20:25:21  23.4N  121.6E Mw=4.7  EMSC   TAIWAN                       

P: 28SEP2022 146870    24.0N  122.0E 4.0-5.4 BAAAA  Taiwan                     

P: 30SEP2022 146866    25.0N  123.0E 4.0-5.4 AABAA  Ryukyu Islands             

 

The strongest earthquake in the world today was an M 5.6 in the Gulf of California, Mexico. NEIC reported it was felt with intensity II-III in Baja California at Los Cabos, Cabo San Lucas and La Palma Sinaloa and possibly beyond this area. This event occurred within minutes of local solar noon and was probably promoted by SFE and by strong tidal stresses which maximize near this hour. It occurred shortly before the official beginning of the X1.0 class solar flare and may have been promoted by preliminary solar activity to this flare such as flare #6880 as it occurred at the maximum of this flare. This earthquake occurred as Hurricane Orlene made landfall several hundred km to the east of this epicenter on the coast of Jalisco, Mexico today. This summary had expected that Orlene was likely to have this seismic effect upon landfall

in previous issues as:

 

"HURR  ORLENE   2022-10-03  00:00 UT  23.3N  105.6W   55 kts  West of Michoacan, Mexico

 

Hurricane Orlene (16E) continued today west of Michoacan, Nexico  with winds up to 130 kts. It is expected to track to the north and may enhance aftershocks in the next several days in Michoacan, Baja and Colima, Mexico. It is likely to make landfall in Colima around October 3" (October 1-3, 2022)

 

A similar earthquake of M 5.6-5.7 hit this area within about 200 km on September 23, 2021 and as an M 6.1 on May 22, 2020. This is the strongest earthquake in the Gulf of  California in the past two years. An M 5.4 occurred about 500 km northwest of this on September 28, 2022. There were no earthquake of M>=5.6 between 2016 and 2020. At the time of the M 5.4 north of this on September 28 this summary noted in this regard:

 

"An M 5.4 occurred today in the Baja Peninsula of Mexico today. NEIC reported it was felt with light intensity in Baja California at Santa Rosalia, Tlalnepantla and Obregon, Sonora. This may be related to the recent landfall of Hurricane Ida in southwestern Florida and Hurricane Fiona as noted in this summary in previous issues:

 

"Hurricane Fiona continued north of the Turks and Cacos Islands near Bermuda as a category 4 storm with winds up to 130 kts. It is expected to track to the north making landfall with the North American Continental slope and rise in the next day. This could help promote seismicity along the western edge of the North American Plate and may have helped trigger the M 7.6 mainshock of September 19 and the 6.8 aftershock in Mexico today.  The area of northern California and north could see enhanced seismicity

 

"Hurricane Fiona continued  over Nova Scotia today with winds up to 100 kts. It is expected to track to the north making landfall with Nova Scotia today. This appears to be one of the strongest storms to hit Nova Scotia in recent years. This could help promote seismicity along the western edge of the North American Plate.  The area of northern California and north could see enhanced seismicity at this time. Some enhanced seismicity may also occur in eastern U.S. and Canada as this storm moves north  

 

"Hurricane Ian (TD 9) continued South of Cuba with winds up to 105 kts. It is expected to track to the west and north over the next several days reaching as a hurricane. It could make landfall near Tampa, Florida. The area is under mandatory evacuation orders preceding this hurricane which is the strongest to hit the Tampa area in decades. Enhanced seismicity may occur in the Caribbean area and central America while this storm is in the area.

 

This is the strongest earthquake within about 200 km of this epicenter since an  M  6.3 on January 19, 2018. Earthquakes of M 5.4 also occurred in the region on July 31, 2021 and January 21, 2022." (September 28, 2022)

 

Forecast 146858 had expected this event in the Gulf of California was likely around September 30 within about 50 km of this epicenter.

 

O: 02OCT2022 19:44:43  23.7N  108.6W ML=4.4  EMSC   GULF OF CALIFORNIA

O:  2OCT2022 19:00:22  23.6N  108.9W Mw=5.6  EMSC   GULF OF CALIFORNIA           

P: 30SEP2022 146858    24.0N  109.0W 3.5-5.0 AAAAA  Gulf of California         

 

Moderately large earthquakes also occurred today in Oceanic provinces. The strongest of these was an M 5.7 in the South Sandwich Islands, but a more unusual quake hit the mid-Indian Ridge with M 5.6. Both of these occurred within about an hour of local solar noon and may have been promoted by high tidal stresses or SFE. Forecast 147306 had expected the M 5.6 in the Mid-Indian Ridge was likely within about 100 km around October 3. The antipode (38N 102W) of this event is in southern Colorado and New Mexico where light to moderate earthquakes occasionally occur and may be associated with moderately large quakes near this epicenter in the Mid-Indian Ridge.

 

O:  2OCT2022 07:32:25  37.9S   77.9E Mw=5.6  EMSC   MID-INDIAN RIDGE             

P:  3OCT2022 147306    37.0S   77.0E 4.0-5.4 AAAAA  So. Indian Ocean           

 

Forecasts 147046 and 147315 had expected the event in the South Sandwich Islands of M 5.7  within about 50 km was likely in late September or early October.

 

O:  2OCT2022 13:05:37  57.8S   25.5W Mw=5.7  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  3OCT2022 147315    58.0S   25.0W 4.0-6.2 AAAAA  So. Sandwich Islands       

P: 29SEP2022 147046    57.0S   25.0W 4.0-6.1 BAAAA  So. Sandwich Islands       

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in Southern Alaska. The last earthquake within about 100 km of this epicenter of larger magnitude than M 4.6 was an M 4.7 on March 23, 2022 about 100 km northeast of  today's epicenter. This event occurred near local solar noon and was probably promoted by SFE and/or tidal stresses which maximize near this hour. Forecast 147253 had expected today's activity in this area was likely around

October 6.

 

O:  2OCT2022 23:03:06  59.5N  154.6W mb=4.6  EMSC   SOUTHERN ALASKA              

P:  6OCT2022 147253    61.2N  151.2W 3.2-5.0 BBBAA  Central Alaska             

 

 

MODERATE QUAKE SHAKES DOMINICAN REPUBLIC

 

EARTHQUAKE SUMMARY FOR OCTOBER 1, 2022

 

 

A moderate earthquake of M 4.7 was widely felt in the Dominican Republic today. NEIC reported it was felt with intensity II-III in the Dominican Republic at Ramon Santana San Pedro de Macoria, El Seibo, Los Llanos, Santo Domingo, El Carril, San Cristobal and in Puerto Rico at Mayaguez and Aguas Buenas.

Hurricane Fiona passed over this epicenter a week ago and enhanced seismicity had been expected in the region as a result of energy from that storm as reported in earlier issues of this summary:

 

"TS Fiona continued today over Puerto Rico with winds up to 85 kts. Major flooding and complete power outage occurred on Puerto Rico today. It is expected to track to the west over the next several days reaching Puerto Rico in the next two  days as a major storm. It could help promoted enhanced seismicity in the Virgin Islands, Leeward Islands and Puerto Rico around September 18-19." (September 18-22, 2022)

 

The only earthquake in the Dominican Republic in the past two years with M>4.7 was an M 5.0 about 50 km southeast of this on June 14, 2021. An M 4.6-4.7 hit about 300 km northwest of this epicenter on July 31, 2022. At the time this summary noted:

 

 

"A moderate earthquake of M 5.0 occurred today midway between Puerto Rico and the Dominican Republic. NEIC reported it was felt with intensity IV in Higuey, Dominican Republic and II-III in the Dominican Republic at Boca de Yuma, Otra Banda La Altagracia, La Romana, San Pedro de Marcoris, Los Llanos, and in Puerto Rico at Aguada, Cabo Rojo, Mayaguez and Anasco. It was preceded by an M 4.1 foreshock felt with intensity IV in Otra Banda and II in Santo Domingo, Dominican Republic. NEIC reported these earthquake in Puerto Rico and the Dominican Republic were felt with intensity II-III in the area(s) of Puerto Rico at Mayaguez and Gurabo. The solar eclipse of June 10 was first visible in this area of the northern Caribbean as previously discussed in this summary. In the previous issue the increased seismicity in this region had been noted as:

 

"Enhanced seismicity in the Virgin Islands and in areas of northeastern Asia is expected to continue for several more days. After several days of enhanced

regional activity today's was muted and seemed to be nearer the border of Puerto Rico and the Dominican Republic than in the Virgin Islands area." (June 13-14, 2021)

 

Today's event of M 5.0 is the strongest within about 100 km since an M 5.3 on February 3, 2019. The only other such event in the region in the past 9 years was an M 5.8 on May 28, 2014." (June 14, 2021)

 

The M 4.7 occurred within about half an hour of local solar noon and was likely promoted by strong tidal stresses which maximize near this hour. It follows an M 5.2 in the Virgin Islands two days ago and had been expected within about 50 km of this epicenter in forecast 147102 in early October. This activity is at 143-145 degrees from the earthquake of M 7.6 in New Guinea of September 10 and the M 7.0 in Luzon, Philippines of July 27, 2022 and may have been promoted by energy from those sources.

 

O:  1OCT2022 17:31:44  18.5N   69.1W mb=4.7  EMSC   DOMINICAN REPUBLIC           

O: 02OCT2022 04:39:06  19.1N   69.6W ML=3.1  EMSC   DOMINICAN REPUBLIC

P:  4OCT2022 147102    18.0N   69.0W 3.4-5.2 BAAAA  Puerto Rico                

 

An earthquake of M 5.5 also occurred today off the coast of Chiapas, Mexico. NEIC reported it was felt with maximum intensity IV in Chiapas at Tuxtla, Gutierrez and II-III in Soyalo, San Cristobal. It was also lightly felt in Quetzaltenango, Guatemala, Oaxaca, Mexico and possibly as far as Mexico City. The last earthquake in Chiapas, Mexico of equal or larger magnitude in the past two  years was an M 5.5 nearly 2 years ago on October 12, 2020. This earthquake occurred near local solar noon and may have promoted by strong tidal stresses. Forecast 147084 had expected today's activity was likely around October 5 within about 100 km in Chiapas. This earthquake is located at 120 degrees (node 3)  from the M 7.0 in Luzon, Philippines (like the M 7.6 in Michoacan) and at 101 degrees from the Loyalty Islands M 7.0 of September 14 and may have been promoted by energy associated with those source.

 

O: 01OCT2022 16:36:54  15.1N   93.9W Mw=5.5  EMSC   OFFSHORE CHIAPAS, MEXICO

O: 01OCT2022 18:54:34  14.9N   94.0W ML=4.2  EMSC   OFF COAST OF CHIAPAS, MEXICO

O:  1OCT2022 20:03:11  14.8N   94.1W ML=4.3  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P:  5OCT2022 147084    15.0N   95.0W 3.5-5.2 BAAAA  Chiapas, Mexico            

 

An M 5.5-5.7 was also felt in the area of Kyushu, Japan today. NEIC reported it was felt with maximum intensity V in Miyazaki, Japan in Nobeoka and IV in Miyazaki and IV in Kumamoto with lesser shaking in Kagoshima, Japan. Super Typhoon Nanmadol passed near this epicenter last week and may have helped promote seismicity in this region at this time as noted in previous issues of this summary:

 

 

"TYPH NANMADOL  2022-09-18  00:00 UT  30.7N  130.7E  115 kts  Kyushu, Japan

 

Typhoon Nanmadol (TD 16W) continued today near Kyushu, Japan with winds up to 115 kts. It is expected to track to the northwest over the next several days reaching southern Kyushu, Japan about September 18 as a typhoon. A moderate to strong earthquake is possible as this storm passes through  southern and central Japan." (September 20, 2022)

 

While an M 5.5 hit Kyushu on October 6, 2021, the last earthquake of larger or equal magnitude in Kyushu was an M 6.1 on May 9, 2019. At the time this summary noted in this regard:

 

 

"The strongest earthquake felt in the world today was an M 6.1-6.3 in Kyushu, Japan. It was preceded by an M 5.5 foreshock. NEIC reported maximum intensity VI in Miyazaki, Japan with V in Miyakonojo and IV in Hyuga and Hiji, Oita, Japan. Intensity II-III was felt in Kagoshima, Taketa, Kumamoto, Makurazaki, Oita and Beppu, Japan. JMA reported intensity V in Miyazaki; IV in Kumamoto, Oita, Kagoshima; and III in Hiroshima, Ehime, Fukuoka, Nagasaki, Japan. The M 5.5 foreshock was felt with intensity IV in Miyazaki and II-III in Kiyotake, Fukuoka and Iwakuni, Yamaguchi, Japan. No major damage occurred in either earthquake and a tsunami warning was not issued. The only other such event in the region of Kyushu within about 200 km of today's epicenter in the past three years was an M 6.3 on January 8, 2019. An M 7.0 hit the region on April 15, 2016 after a foreshock the day before of M 6.2. Further earthquakes in the area can be expected in the next several days." (May 9-10, 2019)

 

Forecast 147114 had expected this activity Kyushu was likely around October 2.  Like moderate earthquake in the Mariana Islands (M 5.4); Bonin Islands (M 5.0); Crete (M 5.0) and the South Sandwich Islands (M 4.6) this epicenter is near 103

 degrees from the M 7.6 in Michoacan, Mexico of September 19 and was probably promoted by energy from that source.

 

O:  1OCT2022 15:02:33  31.4N  131.4E Mw=5.7  EMSC   KYUSHU, JAPAN                

P:  2OCT2022 147114    29.0N  130.0E 4.0-5.4 ACBAA  Kyushu Japan               

 

The swarm in the Reykjanes Ridge began to dissipate today. Only three moderate earthquakes were located in this area today - of M 4.6, 4.6 and 4.4. These occurred near local solar noon and they may have been promoted by strong tidal stresses which maximize near this hour. This swarm began four days ago when the area was hit by the remnants of Hurricane Fiona and has continued more that 50 moderate quakes including two of M 5.7 and an M 5.9-6.0 yesterday.

Forecast 147238 had expected this activity in early October within about 100 km.

 

O: 01OCT2022 13:37:47  54.0N   35.1W mb=4.6  EMSC   REYKJANES RIDGE

O: 01OCT2022 13:41:41  54.1N   35.1W mb=4.6  EMSC   REYKJANES RIDGE

O:  1OCT2022 11:31:20  54.0N   35.1W mb=4.4  EMSC   REYKJANES RIDGE              

P:  2OCT2022 147238    53.0N   34.0W 4.0-5.4 AAAAA  North Mid-Atlantic Ridge   

 

Two earthquake of M 4.6 also occurred in the South Sandwich Islands region today. These also occurred near local solar midnight and noon and were likely

promoted by high tidal stresses. Forecasts 147046 and 147316 had expected enhanced seismicity in the South Sandwich Islands in late September or early

October within about 100 km of these epicenters. More moderate to large earthquakes are still likely in this area which is near 103 degrees from Michoacan, Mexico and where far-field aftershocks are likely at this time.

 

O:  1OCT2022 22:39:31  57.9S   25.6W mb=4.6  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 29SEP2022 147046    57.0S   25.0W 4.0-6.1 AAAAA  So. Sandwich Islands       

 

O:  1OCT2022 12:32:24  58.8S   23.1W mb=4.6  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  1OCT2022 147316    60.0S   23.0W 4.0-5.6 ABAAA  So. Sandwich Islands       

 

MODERATELY STRONG QUAKE SHAKES NORTHERN SUMATRA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 20, 2022

 

 

The strongest earthquakes in the world today were an M 6.0 in the Reykjanes Ridge, North Atlantic and an M 5.9-6.0 in northern Sumatra. The event in Sumatra was reported by NEIC to have been felt with intensity VII in Sibolga, Northern Sumatra and in Malaysia at Banting, Petaling, Kuala Lumput and Semenyih. An M 5.0 aftershock was felt with intensity IV in Rantauprapat, Northern Sumatra and possibly in Malaysia. BMG reported this earthquake was an M 6.0 felt with intensity VI in Tarutung, IV in Singkil, V in Spiahutar and III in Tapaktuan and Gunung Sitoli, Sumatra. The last earthquake of M>=5.8 within about 200 km of this epicenter was an M 6.1 on November 8, 2015 and prior to that an M 6.0 on May 19, 2008.  This activity in Sumatra near the geomagnetic equator occurred at the height of today's geomagnetic storm and were probably promoted by energy associated with this storm as noted in the previous issues of this summary:

 

"The geomagnetic field saw quiet conditions today. The AP level was  7. High latitudes also saw active conditions with AP 8. Active to stormy conditions in the geomagnetic storm in the next three days may help promote additional enhancement of seismicity at high latitudes and near the geomagnetic equator today and in the next several days. " (September 30, 2022)

 

Forecast 146802 had expected this earthquake was likely in late September within about 25 km of this epicenter. This activity is at 144-149 degrees from the earthquakes in the Loyalty Islands of M 7.0 of September 14, 2022 and from the M 7.6 in Michoacan, Mexico of September 19, 2022 and had been expected as far-field activity from Mexico in this summary as:

 

 

"Areas likely to see far-field seismic enhancement from this earthquake include:

Outer shadow zone edge (141-148 degrees): Mexico to Minahassa, Sea of Bengal, Australia, SE Indian Ridge, Java, Andaman Islands, " (September 19-20, 2022)

 

It was also expected as a far field aftershock of the M 7.0 in the Loyatlty  Islands of September 14, 2022 as:

 

"Node 5 (72 degrees)

Loyalty Islands to Sumatra, Kuril Islands, " (September 14, 2022)

 

O: 30SEP2022 19:54:30   2.0N   99.0E ML=4.6  EMSC   NORTHERN SUMATRA, INDONESIA

O: 30SEP2022 20:01:59   2.0N   99.0E ML=4.1  EMSC   NORTHERN SUMATRA, INDONESIA

O: 30SEP2022 19:28:43   2.1N   98.8E Mw=5.8  EMSC   NORTHERN SUMATRA, INDONESIA

O: 30SEP2022 19:28:41   2.1N   98.9E Mw=6.0  BMG    NORTHERN SUMATRA, INDONESIA

O: 30SEP2022 19:28:43   2.1N   98.9E Mw=5.9  ANSS   NORTHERN SUMATRA, INDONESIA

O: 30SEP2022 19:28:43   2.1N   98.8E Mw=5.8  EMSC   NORTHERN SUMATRA, INDONESIA

O: 30SEP2022 20:37:42   2.1N   99.0E mb=5.0  EMSC   NORTHERN SUMATRA, INDONESIA

O: 30SEP2022 21:03:16   2.1N   99.0E ML=4.1  EMSC   NORTHERN SUMATRA, INDONESIA

O: 30SEP2022 19:50:39   2.2N   98.9E mb=5.0  EMSC   NORTHERN SUMATRA, INDONESIA  

P: 22SEP2022 146802     2.0N   99.0E 4.0-5.5 CAAAA  So. Sumatera               

 

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 sequenced 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. Forecast 146979 had expected this activity was likely within about 25 km of this epicenter was likely around September 26. This activity is at 143 degrees from the M 7.0 in the Loyalty Islands of September 14, 2022 and at 101-105 degrees from the M 6.9 in Taiwan of September and the M 7.0 in Luzon, Philippines of July 27, 2022 and near the sixth node (60 degrees) from the M 7.6 in Michoacan Mexico of September 19 and was probably promoted by energy from those source." (September 26-27, 2022) This activity is located at 143-144 degrees from the M 7.0 in the Loyalty Islands of  September 14 and at 102 degrees from the M 6.9 in Taiwan of September 18 and was probably promoted by energy from that source." (September 28-29, 2022)

 

O: 01OCT2022 01:18:53  53.8N   35.5W Mw=6.0  ANSS   REYKJANES RIDGE

O: 30SEP2022 12:21:07  53.6N   35.2W mb=4.6  EMSC   REYKJANES RIDGE

O: 01OCT2022 01:18:53  53.8N   35.5W Mw=5.9  EMSC   REYKJANES RIDGE

O: 01OCT2022 04:58:04  53.8N   35.3W mb=4.8  EMSC   REYKJANES RIDGE

O: 01OCT2022 02:06:09  53.9N   35.3W Mw=5.0  EMSC   REYKJANES RIDGE

O: 30SEP2022 19:52:05  53.9N   35.3W mb=4.8  EMSC   REYKJANES RIDGE

O: 30SEP2022 12:50:09  54.1N   35.3W mb=4.8  EMSC   REYKJANES RIDGE

O: 30SEP2022 11:38:53  53.5N   35.3W mb=4.6  EMSC   REYKJANES RIDGE               

P: 26SEP2022 146979    54.0N   35.0W 4.0-5.7 BAAAA  North Mid-Atlantic Ridge   

 

An earthquake of M 5.3 also occurred near the equator in the Central Atlantic north of Ascension Island today. This is near the location of a tropical storm forming in the area and may have been promoted by energy associated with that storm. Forecast 146803 had expected activity within about 100 km of this epicenter would be enhanced at the end of September.

 

O:  1OCT2022 05:12:39   1.4S   15.3W Mw=5.3  EMSC   NORTH OF ASCENSION ISLAND    

P: 24SEP2022 146803     1.0S   16.0W 4.0-5.8 CAAAA  Central Mid-Atlantic       

 

 

Two M-class solar flares occurred today - an M2.9 (#6230)  and an M1.3 (#6240) beginning about 16:11 UT and 1730 UT.

 

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

 

6230       1611   1622      1633   M2.9      (September 30, 2022)   2.2E-02  

6240       1730   1734      1745   M1.3      (September 30, 2022)   8.9E-03  

 

The strongest seismicity in the western hemisphere today occurred as an M 5.2-5.3 preceded by an M 3.9 foreshock in the region of El Salvador. The M 3.9 occurred in the area of El Salvador at the beginning of flare 6230 while a moderate shock of M 5.2 occurred later with the beginning of flare 6240. These two event were located two minutes after the reported start of these flares and were probably triggered by SFE from these flares. The mainshock of M 5.2 occurred within minutes of local solar noon, a time when SFE are most seismo-effective. Forecast 146843 had expected this activity was likely within about 10-50 km at the end of September.

 

O: 30SEP2022 17:32:38  12.3N   88.3W Mw=5.2  EMSC   OFFSHORE EL SALVADOR

O: 30SEP2022 16:13:58  13.0N   88.8W ML=3.9  EMSC   OFFSHORE EL SALVADOR

O: 30SEP2022 12:21:30  12.1N   88.0W ML=4.0  EMSC   NEAR COAST OF NICARAGUA      

P: 26SEP2022 146843    12.0N   88.0W 3.5-5.6 BAAAA  Nicaragua                  

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in Southern Alaska. NEIC reported this earthquake of M 4.0 in Southern Alaska was felt with intensity II-III in the area(s) of Southern Alaska in Kenai, Ninilchik, Anchor Point, Soldotna, Sterling, Homer, Anchorage. This is not an unusual event in this region. The last event within about 100 km of this epicenter with M>=4.2 was an M 4.7 on July 12, 2022. Forecasts 146989 had expected today's event was likely in this area at the end of September.

 

O: 30SEP2022 23:24:08  61.1N  152.1W Mw=4.2  EMSC   SOUTHERN ALASKA              

P: 26SEP2022 146989    60.5N  151.5W 3.2-5.1 BAAAA  Central Alaska             

P: 26SEP2022 146989    61.3N  150.9W 3.2-5.1 BAAAA  Central Alaska             

 

S

MODERATE QUAKES IN MYANMAR AND SOUTHEASTERN ALASKA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 29, 2022

 

A moderate earthquake of M 5.6 was widely felt in Myanmar today. It was reported by NEIC to have been felt with maximum intensity IV in Myanmar at Mawlaik, Mandalay, in Idia at Namipur and Assam with IV and with lesser intensity in Bangladesh at Uttar Dhurung, Chattagam, Fatekharkul, Baraghop and Silhat. This is the strongest earthquake in Myanmar since M 5.9 in Myanmar on July 21, 2022 about 500 km southeast of today's epicenter. The last earthquake within about 250 km of this epicenter with equal or larger magnitude than today's was an M 6.2 southwest of this on November 25, 2021. At the time this summary noted in this regard:

 

 

"The strongest earthquake in the world today was an M 6.2 on the Myanmar-India border. NEIC reported it was felt with maximum intensity VIII in North Vanlaiphai, India; VII in Rangamali, Bangladesh and Champhal, Mizoram, India and VI in Lunglei and Serchhip, and V in Alzaei and Mamit, Mizoram, India and in Bangladesh at Ranguna and Bandarban with IV in Saiha, Mizorm, India. The press reported light to moderate regional damage with this earthquake.  This is the strongest earthquake within about 250 km of this epicenter since an M 6.9 on April 13, 2015 and an M 6.8 on November 11, 2012. In the past 30 years similar earthquakes also hit the region on June 15, 1992 and January 5, 1991." (November 25-26, 2021)

 

Forecast 146863 had expected enhanced seismicity in this area of Myanmar was likely at the end of September.

 

O: 30SEP2022 02:23:15  24.8N   94.9E mb=4.6  EMSC   MYANMAR-INDIA BORDER REGION

O: 29SEP2022 22:22:37  23.1N   95.0E Mw=5.6  EMSC   MYANMAR                      

P: 30SEP2022 146863    20.0N   96.0E 4.0-5.4 ACAAA  Myanmar                     

 

The strongest earthquake in the world today was an M 5.8 in the Loyalty Islands of the southwest Pacific. It was not reported felt in this remote area. This appears to be an aftershock of the M 7.0 about 200 km northwest of this epicenter in the Loyalty Islands of September 14, 2022. Forecast 147025 had expected today's activity was likely at the end of September. This activity and that in the Reykjanes Ridge of the North Atlantic are separated by 143 degrees and may have

helped enhance each other.

 

O: 29SEP2022 22:59:01  22.9S  172.3E Mw=5.8  EMSC   SOUTHEAST OF LOYALTY ISLANDS

P: 24SEP2022 147025    22.0S  171.0E 4.0-5.4 BAAAA  Loyalty Islands            

P: 27SEP2022 147025    21.0S  171.0E 4.0-5.4 ABAAA  Loyalty Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 5.1-5.3 in Southeastern Alaska. NEIC reported it was felt with intensity II-III in Alaska at Yakutat, Juneau, Anchorage, and possibly Fairbanks. This is the strongest earthquake within about 200 km of this epicenter in southeastern Alaska since an M 5.9 on July 25, 2014. An earthquake of M 5.1-5.2 occurred in the area on January 8, 2022.  Today's earthquake occurred near local solar noon at a longitude where tidal stresses were maximized during the new moon of September 25 as noted in previous issues of this summary:

 

 

"The new moon arrived on September 25, 2022 at 21:54 UT. Longitudes which were at local solar noon at this time are located near 150W while those at local solar midnight are near 30E. These include areas of Southern Alaska and western U.S. and Canada in the west and eastern Europe including Greece and Turkey in the east. These areas may see significant increases in seismicity during the next week." (September 23-28, 2022)

 

Forecast 146987 had expected a moderate earthquake in this region was likely at the end of September 2022. This activity is at the forth node (90 degrees) from the Loyalty Islands M 7.0 of September 14, 2022 and may have been promoted by energy from that source.

 

 

O: 29SEP2022 23:08:10  60.2N  141.3W Mw=5.0  EMSC   SOUTHERN ALASKA              

O: 29SEP2022 23:08:11  60.2N  141.3W MB=5.3  ECAN of Burwash Landing, YT  

P: 24SEP2022 146987    61.3N  140.1W 3.2-5.6 BBAAA  Central Alaska             

P: 28SEP2022 146987    60.0N  137.0W 3.2-5.6 AABAA  Central Alaska             

 

The strong swarm in the Reykjanes Ridge of the North Atlantic continued for the third day today. The maximum event in the area today was an M 5.7, the strongest to date in the current activity. This summary noted this swarm in the previous issue as:

 

"The strong swarm in the Reykjanes Ridge south of Iceland also continued today with more than 20 new events of M>=4 included three of M 5.1. This series began September 26 and included an M 5.7 when Hurricane Fiona, the strongest ocean storm in this region in decades,  passed over this epicenter. Forecast  146979 had expected this activity was likely around September 26." (September 28-29, 2022)

 

O: 29SEP2022 07:50:13  53.5N   35.5W mb=4.7  EMSC   REYKJANES RIDGE

O: 29SEP2022 12:16:43  53.6N   35.3W mb=4.7  EMSC   REYKJANES RIDGE

O: 29SEP2022 15:11:01  53.7N   35.7W mb=4.8  EMSC   REYKJANES RIDGE

O: 29SEP2022 20:47:03  53.7N   35.2W ML=4.4  EMSC   REYKJANES RIDGE

O: 29SEP2022 15:32:31  53.8N   35.2W Mw=5.7  EMSC   REYKJANES RIDGE

O: 29SEP2022 20:23:50  53.8N   35.2W Mw=4.7  EMSC   REYKJANES RIDGE

O: 29SEP2022 09:32:28  53.9N   35.3W Mw=4.9  EMSC   REYKJANES RIDGE

O: 29SEP2022 09:55:58  53.9N   35.2W mb=5.1  EMSC   REYKJANES RIDGE

O: 29SEP2022 12:30:04  53.9N   35.2W mb=4.5  EMSC   REYKJANES RIDGE

O: 29SEP2022 22:18:52  53.9N   35.2W mb=5.0  EMSC   REYKJANES RIDGE

O: 29SEP2022 22:18:52  53.9N   35.2W mb=5.0  EMSC   REYKJANES RIDGE

O: 30SEP2022 03:22:17  53.9N   35.2W mb=4.6  EMSC   REYKJANES RIDGE

O: 29SEP2022 08:14:51  53.3N   35.5W mb=4.7  EMSC   REYKJANES RIDGE              

P: 26SEP2022 146979    54.0N   35.0W 4.0-5.7 BAAAA  North Mid-Atlantic Ridge   

 

 

TRONG EARTHQUAKE IN SOUTH ATLANTIC 103 DEGREES FROM MICHOACAN, MEXICO M 7.6

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 28, 2022

 

The strongest earthquake in the world today was an M 6.6 in the South Atlantic region east of the South Sandwich Islands.  The epicenter of this earthquake is at 103 degrees from the M 7.6 in Michoacan, Mexico of September 19, 2022 and is the strongest earthquake in the world since that event. The likelihood of seismic triggering at this distance from the Michoacan event had been noted in previous issues of this summary as:

 

"Areas likely to see far-field seismic enhancement from this earthquake include:

 

P- and S- shadow zone edge and node 7 (101-110 degrees): Mexico to Greece. Turkey, Vanuatu, Hokkaido, Southern Mid-Atlantic" (September 19-20, 2022)

 

As noted on many occasions in previous issues of this summary, energy associated with body waves and surface wave is most concentrated at the Shadow zone boundary on the surface (at and near 103 degrees from the main surface disturbance). This energy can subsequently trigger subsequential seismicity in seismic areas at that distance from the epicenter of the main disturbance which can include major earthquakes, major nuclear tests, strong cyclones, meteor impacts etc.

 A pair of M 5.1 quakes in the Mariana Islands as well as moderate quakes in the Bonin and Izu Islands and an M 4.5 in the Mediterranean today were also located  103 degrees from Michoacan, Mexico.

 

Today's M 6.7 was followed about an hour later by an M 5.4 aftershock. It occurred near local solar midnight and was likely enhanced by strong tidal stresses which maximize near this hour. Forecast 146791 had expected this event within about 100 km was likely around September 20.

 

O: 29SEP2022 04:11:26  60.8S   20.2W mb=5.4  EMSC   EAST OF SOUTH SANDWICH ISLANDS

O: 29SEP2022 03:03:24  60.9S   20.1W Mw=6.7  EMSC   EAST OF SOUTH SANDWICH ISLANDS

P: 20SEP2022 146791    61.0S   22.0W 4.0-5.6 CAAAA  Southern  Ocean            

 

The strong swarm in the Reykjanes Ridge south of Iceland also continued today with more than 20 new events of M>=4 included three of M 5.1. This series began September 26 and included an M 5.7 when Hurricane Fiona, the strongest ocean storm in this region in decades,  passed over this epicenter. Forecast  146979 had expected this activity was likely around September 26.

 

O: 28SEP2022 07:13:15  53.6N   35.1W mb=4.4  EMSC   REYKJANES RIDGE

O: 28SEP2022 10:59:47  53.6N   35.3W mb=4.6  EMSC   REYKJANES RIDGE

O: 28SEP2022 14:13:46  53.6N   35.3W Mw=5.1  EMSC   REYKJANES RIDGE

O: 29SEP2022 02:06:46  53.6N   35.3W mb=4.6  EMSC   REYKJANES RIDGE

O: 28SEP2022 07:59:37  53.7N   35.5W mb=4.9  EMSC   REYKJANES RIDGE

O: 28SEP2022 12:30:43  53.7N   35.6W mb=4.6  EMSC   REYKJANES RIDGE

O: 28SEP2022 21:11:18  53.7N   35.3W mb=4.7  EMSC   REYKJANES RIDGE

O: 29SEP2022 06:58:40  53.7N   35.5W mb=4.7  EMSC   REYKJANES RIDGE

O: 28SEP2022 12:49:10  53.8N   35.2W mb=4.6  EMSC   REYKJANES RIDGE

O: 28SEP2022 13:20:52  53.8N   35.3W mb=4.4  EMSC   REYKJANES RIDGE

O: 28SEP2022 17:56:23  53.8N   35.2W mb=4.4  EMSC   REYKJANES RIDGE

O: 28SEP2022 23:42:41  53.8N   35.8W mb=4.5  EMSC   REYKJANES RIDGE

O: 29SEP2022 04:45:07  53.8N   35.2W mb=4.8  EMSC   REYKJANES RIDGE

O: 29SEP2022 05:38:52  53.8N   35.4W mb=4.6  EMSC   REYKJANES RIDGE

O: 28SEP2022 09:06:05  53.9N   35.4W mb=4.6  EMSC   REYKJANES RIDGE

O: 28SEP2022 09:50:58  53.9N   35.3W mb=4.7  EMSC   REYKJANES RIDGE

O: 28SEP2022 10:03:05  53.9N   35.2W Mw=5.1  EMSC   REYKJANES RIDGE

O: 29SEP2022 00:38:28  53.9N   35.3W mb=4.9  EMSC   REYKJANES RIDGE

O: 29SEP2022 06:36:03  53.9N   35.2W Mw=5.0  EMSC   REYKJANES RIDGE

O: 29SEP2022 04:08:23  54.0N   35.3W mb=5.0  EMSC   REYKJANES RIDGE

O: 29SEP2022 00:34:29  54.1N   35.3W mb=4.5  EMSC   REYKJANES RIDGE

O: 29SEP2022 02:24:00  53.5N   35.2W Mw=5.1  EMSC   REYKJANES RIDGE              

P: 26SEP2022 146979    54.0N   35.0W 4.0-5.7 BAAAA  North Mid-Atlantic Ridge   

 

Another moderately large earthquake today occurred south of Michoacan, Mexico with M 5.5 on the Northern East Pacific Rise. This is the strongest quake within about 200 km of this epicenter since an M 5.7 on December 23, 2020; an M 6.0 on January 18, 2019 and an M 5.8 on May 14, 2016. It was not reported felt. This earthquake occurred as a new Tropical Depression was forming near the epicenter. This summary had noted this as:

 

"TS    ORLENE   2022-09-29  00:00 UT  14.5N  104.4W  045 kts  south of Michoacan, Mexico

 

 

TS Orlene (16E) continued today south of Michoacan, Nexico  with winds up to 45 kts. It is expected to track to the north and may enhance aftershocks in the next several days in the northern East Pacific Rise and in Michoacan, Baja and Colima, Mexico." (September 29, 2022)

 

 

O: 28SEP2022 22:34:48   8.5N  102.7W Mw=5.5  EMSC   NORTHERN EAST PACIFIC RISE   

 

 

An unusually larger M 5.1 also occurred in the northeastern Caribbean and was felt from the Virgin Islands to Guadeloupe, Leeward Islands.  A moderate earthquakes of M 5.0-5.1 occurred today in the region of the Virgin Islands and in Antigua, Barbuda in the northeastern Caribbean. NEIC reported it was felt with maximum intensity IV in Saint John's Barbuda and Antigua with intensity II-III in Codrington, Cedar Grove, Potters Village, Antigua and Barbuda and in Saint Kitts and Nevis at Mansion Christ Church, Nochola Town, Monkey Hill Basseterre, Boyds Trinity, and in Point-a-Pitre, Grande-Terre, Guadeloupe. This is the strongest earthquake within about 200 km of these epicenters since an M 5.2 on February 9, 2018. The last of significantly larger magnitude in this region was an M 5.6 on April 17, 2017. Hurricane Fiona passed over this epicenter several days ago and enhanced seismicity was expected due to stresses from this storm in this summary at the time as:

 

"TS Fiona continued today south of Puerto Rico with winds up to 60 kts. It is expected to track to the west over the next several days reaching Puerto Rico in the next two  days as a major storm. It could help promoted enhanced seismicity in the Virgin Islands, Leeward Islands and Puerto Rico around September 18-19." (September 18-24, 2022)

 

Forecast 146834 had expected today's activity in this area was likely around September 26.  This activity is located at 144 degrees from the M 7.0 in Luzon, Philippines of July 27, 2022 and may have been promoted by energy

from that source.

 

O: 28SEP2022 21:37:56  17.9N   61.6W ML=4.2  EMSC   ANTIGUA AND BARBUDA REGION

O: 29SEP2022 00:36:19  17.9N   61.5W ML=3.9  EMSC   ANTIGUA AND BARBUDA REGION

O: 28SEP2022 21:34:02  18.0N   61.4W Mw=4.3  EMSC   ANTIGUA AND BARBUDA REGION

O: 28SEP2022 19:48:39  17.7N   61.7W Mw=5.1  EMSC   ANTIGUA AND BARBUDA REGION   

P: 26SEP2022 146834    17.0N   60.0W 3.0-5.2 AABAA  Leeward Islands            

 

 

The strongest earthquake in the U.S. or Canada today was an M 3.4 in the area of  San Francisco, California.  NEIC reported this earthquake of M 3.4 south of San Francisco, California  was felt with intensity II-III in the area(s) of San Francisco, California in Livermore, Milpitas, San Jose, Pleasanton, Fremont. This event is the strongest within about 50 km of this epicenter since an M 4.1 on June 2, 2022. The only other such event within this area this year was an M 3.6 on March 19, 2022.  Forecast 146882 had expected this activity within about 25 km was likely around September 28.

 

O: 28SEP2022 17:02:02  37.5N  121.6W Ml=3.4  EMSC   NORTHERN CALIFORNIA          

O: 28SEP2022 09:58:56  38.1N  122.0W Md=2.1  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 28SEP2022 146882    37.7N  121.9W 2.5-4.5 AAAAA  Central California         

 

 

MODERATE QUAKES SHAKE BAJA CALIFORNIA, MEXICO AND CENTRAL PHILIPPINES

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 27, 2022

 

An M 5.4 occurred today in the Baja Peninsula of Mexico today. NEIC reported it was felt with light intensity in Baja California at Santa Rosalia, Tlalnepantly and Obregon, Sonora. This may be related to the recent landfall of Hurricane Ida in southwestern Florida and Hurricane Fiona as noted in this summary in previous issues:

 

"Hurricane Fiona continued north of the Turks and Cacos Islands near Bermuda as a category 4 storm with winds up to 130 kts. It is expected to track to the north making landfall with the North American Continental slope and rise in the next day. This could help promote seismicity along the western edge of the North American Plate and may have helped trigger the M 7.6 mainshock of September 19 and the 6.8 aftershock in Mexico today.  The area of northern California and north could see enhanced seismicity” (September 25, 2022)

 

And 

 

"Hurricane Fiona continued  over Nova Scotia today with winds up to 100 kts. It is expected to track to the north making landfall with Nova Scotia today. This appears to be one of the strongest storms to hit Nova Scotia in recent years. This could help promote seismicity along the western edge of the North American Plate.  The area of northern California and north could see enhanced seismicity at this time. Some enhanced seismicity may also occur in eastern U.S. and Canada as this storm moves north” (September 26, 2022)

 

Iand

 

"Hurricane Ian (TD 9) continued South of Cuba with winds up to 105 kts. It is expected to track to the west and north over the next several days reaching as a hurricane. It could make landfall near Tampa, Florida. The area is under mandatory evacuation orders preceding this hurricane which is the strongest to hit the Tampa area in decades. Enhanced seismicity may occur in the Caribbean area and central America while this storm is in the area.” (September 27, 2022)

 

This is the strongest earthquake within about 200 km of this epicenter since an  M  6.3 on January 19, 2018. Earthquakes of M 5.4 also occurred in the region on July 31, 2021 and January 21, 2022. This area had been expected in forecast 146586 to see enhanced seismicity  towards the end of September, 2022.  This earthquake like the M 5.3 in Turkey today is located at 104 degrees from the M 7.6 in New Guinea of September 10, 2022 and was probably promoted by energy from that source.

 

 

O: 28SEP2022 01:18:26  27.1N  111.1W Mw=5.4  EMSC   GULF OF CALIFORNIA            

O: 28SEP2022 02:17:14  26.9N  111.4W mb=4.2  EMSC   GULF OF CALIFORNIA

P: 17SEP2022 146586    28.0N  112.0W 3.5-5.1 CAAAA  Gulf of California         

 

Earthquakes of M 5.3 and 4.7 with smaller aftershocks occurred today in northern Mindanao, Philippines. NEIC reported it was felt lightly in Maygatasan, Caraga, Philippines. This epicenter is near the location where Typhoon Noru made landfall two days as and may have been promoted by energy associated with that storm as noted in previous issues of this summary:

 

"Super-Typhoon Noru (TD 18W) continued today over Luzon, Philippines with winds up to 130 kts. It is expected to track to the west and could help promote enhanced seismicity in the Philippines most likely around September 25-26." (September 24-26, 2022)

 

The last earthquake within about 150 km of this epicenter in the Philippines with larger or equal magnitude was an M 5.5 on June 2, 2022 and also on April 3, 2022. The last of significantly larger magnitude in this area was an M 6.0 on November 15, 2020. Forecast 146794 had expected today's event was likely in this area around September 30.

 

O: 28SEP2022 02:39:27   9.3N  126.3E mb=4.7  EMSC   MINDANAO, PHILIPPINES

O: 28SEP2022 01:12:26   9.4N  126.5E Mw=5.2  EMSC   MINDANAO, PHILIPPINES        

O: 28SEP2022 01:12:26   9.4N  126.5E Mw=5.3  ANSS   MINDANAO, PHILIPPINES        

P: 30SEP2022 146794     9.0N  126.0E 4.0-5.6 AAAAA  Central Philippines        

 

An M 5.3 was also felt in eastern Turkey near the Georgia border today. NEIC reported these earthquake of M 5.3 and 4.4 in Eastern Turkey was felt with intensity CI in Susuz, Kars, Turkey and II-III in the area(s) of  in Tbilisi and Batumi, Ajaria, Georgia. A similar M 5.3 hit within about 200 km on February 13, 2022 but the only earthquake of larger magnitude in this area of eastern Turkey in the past thirty-two years was an M 5.5 on December 16, 1990. Forecasts 146663 and 146931 had expected today's activity was likely in this area at the end of September, 2022. This earthquake like the M 5.4 in Baja Mexico today is located at 104 degrees from the M 7.6 in New Guinea of September 10, 2022 and was probably promoted by energy from that source.

 

O: 27SEP2022 14:08:34  40.7N   42.9E Mw=5.3  EMSC   EASTERN TURKEY               

O: 27SEP2022 14:24:40  40.8N   42.9E mb=4.3  EMSC   EASTERN TURKEY

O: 27SEP2022 14:43:36  40.8N   42.8E ML=4.0  EMSC   EASTERN TURKEY

O: 27SEP2022 16:16:54  40.8N   42.9E mb=4.4  EMSC   EASTERN TURKEY

P: 18SEP2022 146663    40.0N   44.0E 3.5-4.9 CAAAA  Caucasus/Caspian Sea        

P: 28SEP2022 146931    43.0N   44.0E 3.5-5.0 ACAAA  Caucasus/Caspian Sea       

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in Hawaii. NEIC reported it was felt with intensity III in Hawaii at Hawaii National Park, Volcano, Naalehu, Pahoa, Mountain View, Hilo, Kurtistown, Holualoa, and Keaau. This is the strongest earthquake in the current eruption of Kilauea since an M 4.6 on April 15, 2022. This earthquake occurred within minutes of local solar noon and was probably promoted by strong tidal stresses associated with the new moon which  maximize near this hour. Forecast 146833 had expected this event within about 25 km was likely around September 24-28.

 

O: 27SEP2022 22:43:58  19.3N  155.4W mb=4.5  EMSC   ISLAND OF HAWAII, HAWAII      

P: 24SEP2022 146833    19.3N  155.2W 3.0-4.5 BAAAA  Hawaii                     

P: 28SEP2022 146833    18.8N  155.2W 3.0-4.5 AAAAA  Hawaii                     

 

An M 3.8 was also widely felt in Central California north of Los Angeles in the Bakersfield area today. NEIC reported this earthquake of M 3.7 in Central California near Lake Isabella was felt with intensity II-III in the area(s) of Central California near Lake Isabella, Bodfish, Weldon, Caliente, Wofford Heights, Kernville, Onyx, Glennville, Bakersfield and Tehachapi.  This is the strongest earthquake in the Bakersfield area of California since an  M 3.8-3.9 on August 27, 2021 and an M 3.8 on July 17, 2022. The last event in the region of significantly larger magnitude was an M 4.3 on April 19, 2014. It occurred within minutes of local solar midnight and was probably promoted by tidal stresses with the new moon which maximize near this hour. Forecast 146916 had expected this event was likely within about 25 km of the epicenter around September 29. This earthquake is located at 104 degrees from the M 6.6 in Sichuan China of September 5, 2022 and at 103 degrees from the M 7.0 in Luzon, Philippines of July 27 and was probably promoted by energy from those sources.

 

O: 27SEP2022 08:03:38  35.5N  118.4W ML=3.8  EMSC   CENTRAL CALIFORNIA

O: 27SEP2022 09:10:43  35.5N  118.4W ML=2.4  EMSC   CENTRAL CALIFORNIA

O: 27SEP2022 13:29:33  35.5N  118.4W Ml=2.0  EMSC   CENTRAL CALIFORNIA

O: 28SEP2022 00:19:01  35.8N  118.0W Ml=2.1  EMSC   CENTRAL CALIFORNIA

O: 27SEP2022 12:53:59  35.3N  118.6W Ml=2.3  EMSC   CENTRAL CALIFORNIA           

P: 29SEP2022 146916    35.3N  118.6W 2.5-4.4 AAAAA  So. California             

 

The strong swarm of earthquakes in the Reykjanes Ridge south of Iceland continued today with more than 30 events of M>=4.0. This summary noted this swarm in the past issue as:

 

"The strongest earthquake in the world today was an M 5.7 in the North Atlantic on the Reykjanes Ridge. It was followed by a strong series of aftershocks.  This area had been expected to see enhanced seismicity at this time as the remnants of Hurricane Fiona passed over this epicenter today. This summary had expected this at this time in previous issues of this summary as:

 

"Hurricane Fiona continued in the North Atlantic today west of the mid-Atlantic Ridge with winds up to 50 km. This storm did considerable damage and flooding in Nova Scotia and Newfoundland, Canada as it hit that region as the strongest storm in decades in the area.  As it moves past Nova Scotia the remnants are expected to track to the east reaching the Northern Mid-Atlantic Ridge in the next day or two near 54N 35W. The Reykjanes Ridge in this area is likely to see enhanced seismicity as Fiona passes this area." (September 25-26, 2022)

 

HUR   FIONA    2022-09-27  00:00 UT  54.9N   34.2W   40 kts  Northern Mid-Atlantic

 

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. Forecast 146979 had expected this activity was likely within about 25 km of this epicenter was likely around September 26. This activity is at 143 degrees from the M 7.0 in the Loyalty Islands of September 14, 2022 and at 101-105 degrees from the M 6.9 in Taiwan of September and the M 7.0 in Luzon, Philippines of July 27, 2022 and near the sixth node (60 degrees) from the M 7.6 in Michoacan Mexico of September 19 and was probably promoted by energy from those source." (September 26-27, 2022) This activity is located at 143-144 degrees from the M 7.0 in the Loyalty Islands of  September 14 and at 102 degrees from the M 6.9 in Taiwan of September 18 and was probably promoted by energy from that source.

 

O: 27SEP2022 07:25:45  53.6N   35.3W mb=4.6  EMSC   REYKJANES RIDGE

O: 28SEP2022 00:55:09  53.7N   35.4W mb=4.9  EMSC   REYKJANES RIDGE

O: 28SEP2022 02:22:36  53.7N   35.2W mb=4.5  EMSC   REYKJANES RIDGE

O: 28SEP2022 06:09:47  53.7N   35.1W mb=4.7  EMSC   REYKJANES RIDGE

O: 27SEP2022 13:21:35  53.8N   35.3W mb=4.8  EMSC   REYKJANES RIDGE

O: 27SEP2022 19:04:48  53.8N   35.2W mb=4.7  EMSC   REYKJANES RIDGE

O: 27SEP2022 19:53:44  53.8N   35.3W mb=4.8  EMSC   REYKJANES RIDGE

O: 27SEP2022 21:09:54  53.8N   35.4W mb=4.8  EMSC   REYKJANES RIDGE

O: 27SEP2022 22:28:52  53.8N   35.3W mb=4.6  EMSC   REYKJANES RIDGE

O: 27SEP2022 23:13:32  53.8N   35.3W mb=4.7  EMSC   REYKJANES RIDGE

O: 28SEP2022 00:22:52  53.8N   35.9W mb=4.6  EMSC   REYKJANES RIDGE

O: 28SEP2022 02:55:24  53.8N   36.1W mb=4.5  EMSC   REYKJANES RIDGE

O: 28SEP2022 03:41:36  53.8N   35.3W mb=4.6  EMSC   REYKJANES RIDGE

O: 27SEP2022 13:07:35  53.9N   35.2W mb=4.8  EMSC   REYKJANES RIDGE

O: 27SEP2022 15:55:52  53.9N   35.3W mb=4.6  EMSC   REYKJANES RIDGE

O: 27SEP2022 15:55:52  53.9N   35.3W mb=4.6  EMSC   REYKJANES RIDGE

O: 27SEP2022 21:18:19  53.9N   35.3W mb=4.9  EMSC   REYKJANES RIDGE

O: 27SEP2022 13:46:51  54.0N   35.1W mb=4.5  EMSC   REYKJANES RIDGE

O: 28SEP2022 01:43:26  54.0N   35.2W mb=4.8  EMSC   REYKJANES RIDGE

O: 28SEP2022 01:43:26  54.0N   35.2W mb=4.8  EMSC   REYKJANES RIDGE

O: 28SEP2022 06:46:21  54.0N   35.2W mb=5.0  EMSC   REYKJANES RIDGE

O: 27SEP2022 07:19:43  54.1N   35.7W mb=4.7  EMSC   REYKJANES RIDGE

O: 27SEP2022 08:13:57  54.1N   35.4W mb=4.5  EMSC   REYKJANES RIDGE

O: 27SEP2022 10:34:57  54.1N   35.3W mb=4.6  EMSC   REYKJANES RIDGE

O: 27SEP2022 11:59:49  54.1N   35.2W mb=4.9  EMSC   REYKJANES RIDGE

O: 27SEP2022 19:39:28  54.1N   35.2W mb=4.6  EMSC   REYKJANES RIDGE

O: 27SEP2022 08:47:39  54.3N   34.8W mb=4.8  EMSC   REYKJANES RIDGE

O: 27SEP2022 10:59:19  54.3N   35.1W mb=4.8  EMSC   REYKJANES RIDGE

O: 28SEP2022 05:01:53  53.5N   35.4W mb=4.5  EMSC   REYKJANES RIDGE              

P: 26SEP2022 146979    54.0N   35.0W 4.0-5.7 AAAAA  North Mid-Atlantic Ridge   

 

Three other moderate earthquakes also occurred in the Atlantic area today. These included event of M 5.2 in the current series in the South Sandwich Islands and an M 4.7 in the current series in the southern Mid-Atlantic ridge. These had been forecast in forecasts 147012, 147029 and 147046 within about 100 km of these epicenter. A more unusual earthquake occurred in the northern  Mid-Atlantic Ridge with M 5.0. This epicenter was under the location of Tropical Depression 11E over the past two days as noted in earlier issues of this summary:

 

"One disturbance is currently poised to become a hurricane in the mid-Atlantic.  It are located at 15N 35W and moving to the west. NHC estimates it could reach cyclone status with 70% chance in the next two days." (September 27-28, 2022)

 

It is likely that stresses associated with TD 11E helped promote this seismicity in the northern Atlantic. Forecast 146842 had expected this event was likely within about 300 km around September 29. The M 5.0 occurred within minutes of local solar noon and was probably also promoted by strong tidal stresses with the new moon which maximize near this hour. 

 

This activity is located at 145-146 degrees from the M 7.0 in the Loyalty Islands of September 14 and at 145-146 degrees from the Luzon quake of July 27, 2022 and was probably promoted by energy from those sources.

 

O: 27SEP2022 15:12:41  12.1N   43.9W mb=5.0  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 29SEP2022 146842    15.0N   45.0W 4.0-5.8 ACAAA  Mid-Atlantic Ridge         

 

The activity in the southern Mid-Atlantic began shortly after the M 7.6 in Papua New Guinea of September 10, 2022 which is at 143 degrees distance and was probably promoted by energy from that source.

 

O: 27SEP2022 16:45:15  20.5S   11.6W mb=4.7  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

P: 27SEP2022 147012    20.0S   11.0W 4.0-5.5 AAAAA  So. Mid-Atlantic Ridge     

P: 28SEP2022 147029    20.0S   12.0W 4.0-5.8 AAAAA  So. Mid-Atlantic Ridge     

 

O: 28SEP2022 06:34:26  58.0S   25.5W mb=5.2  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 29SEP2022 147046    57.0S   25.0W 4.0-6.1 AAAAA  So. Sandwich Islands       

 

 

 

 

 

 

 

STRONG EARTHQUAKE SERIES OCCURS AS FIONA HITS NORTH ATLANTIC RIDGE

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 26, 2022

 

 

The strongest earthquake in the world today was an M 5.7 in the North Atlantic on the Reykjanes Ridge. It was followed by a strong series of aftershocks.  This area had been expected to see enhanced seismicity at this time as the remnants of

Hurricane Fiona passed over this epicenter today. This summary had expected this at this time in previous issues of this summary as:

 

"Hurricane Fiona continued in the North Atlantic today west of the mid-Atlantic Ridge with winds up to 50 km. This storm did considerable damage and flooding in Nova Scotia and Newfoundland, Canada as it hit that region as the strongest storm in decades in the area.  As it moves past Nova Scotia the remnants are expected to track to the east reaching the Northern Mid-Atlantic Ridge in the next day or two near 54N 35W. The Reykjanes Ridge in this area is likely to see enhanced seismicity as Fiona passes this area." (September 25-26, 2022)

HUR   FIONA    2022-09-27  00:00 UT  54.9N   34.2W   40 kts  Northern Mid-Atlantic

 

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. Forecast 146979 had expected this activity was likely within about 25 km of this epicenter was likely around September 26. This activity is at 143 degrees from the M 7.0 in the Loyalty Islands of September 14, 2022 and at 101-105 degrees from the M 6.9 in Taiwan of September and the M 7.0 in Luzon, Philippines of July 27, 2022 and near the sixth node (60 degrees) from the M 7.6 in Michoacan Mexico of September 19 and was probably promoted by energy from those source.

 

O: 27SEP2022 01:59:00  53.8N   35.1W mb=4.3  EMSC   REYKJANES RIDGE

O: 27SEP2022 03:05:35  53.8N   34.6W mb=4.6  EMSC   REYKJANES RIDGE

O: 27SEP2022 06:01:14  53.8N   35.0W mb=4.6  EMSC   REYKJANES RIDGE

O: 26SEP2022 18:21:57  53.9N   35.3W mb=4.8  EMSC   REYKJANES RIDGE

O: 26SEP2022 20:30:17  53.9N   35.4W Mw=5.3  EMSC   REYKJANES RIDGE

O: 27SEP2022 03:58:03  53.9N   35.2W mb=4.4  EMSC   REYKJANES RIDGE

O: 27SEP2022 06:45:06  53.9N   35.3W mb=4.5  EMSC   REYKJANES RIDGE

O: 26SEP2022 09:59:57  54.0N   35.3W Mw=5.7  EMSC   REYKJANES RIDGE

O: 26SEP2022 14:54:50  54.0N   34.9W mb=4.7  EMSC   REYKJANES RIDGE

O: 26SEP2022 15:45:13  54.0N   35.4W mb=4.7  EMSC   REYKJANES RIDGE

O: 26SEP2022 17:16:07  54.0N   35.3W mb=4.9  EMSC   REYKJANES RIDGE

O: 26SEP2022 18:36:19  54.0N   35.2W mb=4.6  EMSC   REYKJANES RIDGE

O: 26SEP2022 19:32:18  54.0N   35.3W mb=4.7  EMSC   REYKJANES RIDGE

O: 26SEP2022 19:39:48  54.0N   35.3W mb=4.9  EMSC   REYKJANES RIDGE

O: 26SEP2022 19:39:48  54.0N   35.3W mb=4.9  EMSC   REYKJANES RIDGE

O: 26SEP2022 22:44:01  54.0N   35.2W mb=4.7  EMSC   REYKJANES RIDGE

O: 26SEP2022 23:05:45  54.0N   35.1W mb=4.7  EMSC   REYKJANES RIDGE

O: 27SEP2022 04:42:08  54.0N   35.2W mb=4.7  EMSC   REYKJANES RIDGE

O: 27SEP2022 05:26:48  54.0N   35.5W mb=4.6  EMSC   REYKJANES RIDGE

O: 26SEP2022 07:41:00  54.1N   35.2W mb=4.9  EMSC   REYKJANES RIDGE

O: 26SEP2022 10:06:54  54.1N   35.3W mb=4.8  EMSC   REYKJANES RIDGE

O: 26SEP2022 14:01:23  54.1N   35.3W mb=4.7  EMSC   REYKJANES RIDGE

O: 26SEP2022 14:49:20  54.1N   35.4W mb=4.6  EMSC   REYKJANES RIDGE

O: 26SEP2022 14:49:20  54.1N   35.4W mb=4.6  EMSC   REYKJANES RIDGE

O: 26SEP2022 14:59:51  54.1N   35.0W mb=4.8  EMSC   REYKJANES RIDGE

O: 26SEP2022 18:14:40  54.1N   35.5W mb=4.9  EMSC   REYKJANES RIDGE

O: 27SEP2022 04:34:29  54.1N   35.3W mb=4.6  EMSC   REYKJANES RIDGE

O: 27SEP2022 06:10:38  54.1N   35.2W mb=4.6  EMSC   REYKJANES RIDGE

O: 26SEP2022 14:07:10  54.3N   35.2W mb=4.7  EMSC   REYKJANES RIDGE

O: 26SEP2022 15:18:46  53.8N   35.0W mb=4.8  EMSC   REYKJANES RIDGE               

P: 26SEP2022 146979    54.0N   35.0W 4.0-5.7 AAAAA  North Mid-Atlantic Ridge   

 

The strongest earthquake in the U.S. or Canada today was an M 5.2 in the Rat Islands, Aleutian. The last earthquake in the Rat Islands with M>=5.2 was an M 5.2 on August 14, 2022. These are probably aftershocks of the M 6.3 on June 4, 2022. Forecast 146981 had expected today's event within about 50 km was likely around September 24.

 

 

O: 26SEP2022 11:39:19  51.5N  178.5E mb=5.2  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 24SEP2022 146981    51.0N  178.0E 4.0-5.6 AAAAA  Rat Islands                

 

 

An earthquake of M 4.6-4.7 was also reported felt in South Island, New Zealand today. GEONET reported this earthquake was felt with moderate intensity in the area of Arthur's Pass, South Island, New Zealand. 1007 felt reports were published including 242 of weak and 453 of light shaking; 281 moderate; 30 strong; 1 severe and 0 extreme shaking in northern South Island. It occurred within minutes of local solar midnight and was probably promoted by high tides with the new moon which maximize near this hour. Forecast 147041 had expected this event within about 50 km was likely around

September 27.

 

O: 26SEP2022 12:52:52  42.4S  171.3E ML=4.6  EMSC   SOUTH ISLAND OF NEW ZEALAND  

O: 26SEP2022 12:52:52  42.4S  171.3E MS=4.7  GEONET Felt with moderate intensity

P: 27SEP2022 147041    42.0S  172.0E 3.0-5.3 AAAAA  So. Island, N.Z.           

 

The second strongest earthquake in the world today was an M 5.4-5.5 in Vanuatu. NEIC reported this earthquake of M 5.5 in Vanuatu was felt with intensity II-III in the area(s) of Vanuatu in Luganville, Sanma. Like the other significant earthquakes enumerated above, this event also occurred within minutes of local solar midnight and was probably promoted by high tidal stresses with the new moon which maximize near this hour. Forecast 147020 had expected this event within about 50 km was likely around September 24.

 

O: 26SEP2022 13:58:02  15.2S  168.3E Mw=5.4  EMSC   VANUATU                       

P: 24SEP2022 147020    15.0S  168.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

 

EARTHQUAKES IN SVALBARD; HONDURAS AT NEW MOON

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 25, 2022

 

A series of moderate earthquakes occurred today in the region of Svalbard north of Norway. This was not reported felt in this remote area. It continues a swarm in the area which began with an M 4.3 on September 18, 2022. These may be aftershocks of an M 5.9 that occurred in the Svalbard region on July 18. Forecast 147002 had expected this enhanced seismicity was likely around September 22 within about 100 km  of today's epicenters. This activity occurred near local solar midnight with two within 10 minutes of the maximum new moon and was likely promoted by tidal energy associated with the new moon which occurred at the same time as noted in this and previous issues of this summary:

 

"The new moon arrived on September 25, 2022 at 21:54 UT. Longitudes which were at local solar noon at this time are located near 150W while those at local solar midnight are near 30E. These include areas of Southern Alaska and western U.S. and Canada in the west and eastern Europe including Greece and Turkey in the east. These areas may see significant increases in seismicity during the next week." (September 23-26, 2022)

 

This activity also precedes the arrival of Hurricane Fiona which is currently in the North Atlantic southwest of these epicenters near the Reykjanes Ridge south of Alaska. Expected activity with this hurricane was noted in this summary in previous issues as:

 

"Hurricane Fiona continued in the North Atlantic today west of the mid-Atlantic Ridge with winds up to 50 km. This storm did considerable damage and flooding in Nova Scotia and Newfoundland, Canada as it hit that region as the strongest storm in decades in the area.  As it moves past Nova Scotia the remnants are expected to track to the east reaching the Northern Mid-Atlantic Ridge in the next day or two near 54N 35W. The Reykjanes Ridge in this area is likely to see enhanced seismicity as Fiona passes this area." (September 24-26, 2022)

 

This activity is at the fifth node (72 degrees) from the M 6.9 in Taiwan of September 18 and may have been promoted by energy from that source.

 

O: 25SEP2022 14:59:02  77.8N    8.2E mb=4.4  EMSC   SVALBARD REGION

O: 25SEP2022 21:45:36  77.8N    8.1E Mw=4.0  EMSC   SVALBARD REGION

O: 25SEP2022 20:50:41  77.9N    7.9E mb=4.2  EMSC   SVALBARD REGION

O: 25SEP2022 14:01:40  78.0N    8.1E mb=4.5  EMSC   SVALBARD REGION

O: 25SEP2022 21:47:41  77.7N    8.9E mb=4.2  EMSC   SVALBARD REGION              

P: 22SEP2022 147002    79.0N    7.0E 4.0-5.8 BBAAA  Arctic Ocean Region        

 

The strongest earthquake in the world today was an M 5.1 in Guatemala/Honduras. These earthquake, like those in Svalbard, also occurred within minutes of the new moon. The M 5.1 is the strongest in northern Guatemala or Honduras since an M 5.4 on August 2, 2022; and M 5.2 on August 25, 2021 and prior to that an M 5.5 on April 10, 2013. Forecast 146844 had expected today's events were likely within about 50 km  around September 22. This activity was related to the passage of Hurricane Ian which was passing near this epicenter at the time of this activity and had been expected in this summary to increase seismicity in this region at this time:

 

“Hurricane Ian (TD 9) continued South of Cuba with winds up to 105 kts. It is expected to track to the west and north over the next several days reaching as a hurricane. It could make landfall near Tampa, Florida. The area is under mandatory evacuation orders preceding this hurricane which is the strongest to hit the Tampa area in decades. Enhanced seismicity may occur in the Caribbean area and central America while this storm is in the area.” (September 24-26. 2022)

 

O: 25SEP2022 21:28:16  15.8N   88.4W mb=4.7  EMSC   GUATEMALA

O: 25SEP2022 21:30:24  15.8N   88.4W Mw=5.1  EMSC   GUATEMALA                    

P: 22SEP2022 146844    16.0N   88.0W 3.5-5.1 BAAAA  Nicaragua                  

 

Another event which may have been activated by Tropical Cyclone activity today occurred as an M 4.2 in the region of Haiti. Hurricane Fiona passed over this epicenter several days ago as noted in this summary at the time:

 

"TS Fiona continued north of Dominican Republic with winds up to 115 kts. Major flooding and complete power outage occurred on Puerto Rico today. It is expected to track to the north and west over the next several days. It could help promote enhanced seismicity in the region of Puerto Rico and the Dominican Republic in the next several days." (September 20-22, 2022)

 

This is the strongest earthquake in Haiti since an M 4.4 on May 29, 2022 and was probably triggered by effects related to the passage of Hurricane Fiona. A series of aftershocks followed an M 5.3 on January 24, 2022. These appear to be aftershocks of the M 7.3 in the area of August 14, 2021. Forecast 146852 had expected today's event within about 100 km was likely around September 25. This epicenter, like that of an M 4.7 in the Central Mid-Atlantic today is at 144 degrees from the M 7.6 in New Guinea of September 10. It is also at this distance from the M 7.0 in Luzon, Philippines of July 27, 2022 and may have been promoted by energy from those sources.

 

O: 25SEP2022 09:13:03  18.5N   73.2W ML=4.2  EMSC   HAITI REGION                 

P: 25SEP2022 146852    19.0N   74.0W 3.4-5.1 AAAAA  Puerto Rico                

 

An M 5.1 also occurred in Mindanao and the Talaud Islands of Indonesia. It was followed by an M 4.5 aftershock. This occurred as Typhoon Noru was making landfall north of this in Luzon, Philippines as noted in this an previous issues of this summary:

 

"Super-Typhoon Noru (TD 18W) continued today over Luzon, Philippines with winds up to 130 kts. It is expected to track to the west and could help promote enhanced seismicity in the Philippines most likely around September 25-26." (September 24-26, 2022)

 

 

NEIC reported this earthquake of M 5.1 in Southern Mindanao, Philippines was felt with intensity II-III in the area(s) of Southern Mindanao, Philippines in Buayan. Forecast 146800 had expected this activity  was likely within about 50 km of this epicenter around September 23.

 

O: 26SEP2022 02:53:44   4.6N  126.5E ML=4.5  EMSC   KEPULAUAN TALAUD, INDONESIA

O: 25SEP2022 11:16:32   4.4N  126.1E Mw=5.1  EMSC   KEPULAUAN TALAUD, INDONESIA  

P: 23SEP2022 146800     4.0N  126.0E 4.0-5.4 AAAAA  Mindanao, Philippines       

 

An unusually large M 4.1 also occurred near local solar midnight in the Strait of Gibraltar. The last event of larger or equal magnitude in the Strait of Gibraltar was an M 4.9 on June 2 and prior to that an M 4.4 on January 1, 2022. Today's event occurred about 100 km north of the normal seismicity in this region. This epicenter is near the antipode of an M 4.8 (within about 100 km) in North Island, New Zealand of September 22, 2022. Forecast 146893 had expected today's event in the Strait of Gibraltar within about 100 km around September 26.

 

O: 26SEP2022 01:48:27  36.7N    4.4W mb=4.1  EMSC   STRAIT OF GIBRALTAR          

P: 26SEP2022 146893    37.0N    3.0W 3.5-5.2 AAAAA  Morocco/Spain              

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in the Andreanof Islands, Aleutians. The last earthquake in this area of larger magnitude than today's was an M 4.7 on September 2, 2022. Forecast 146971 had expected today's event within about 50 km was likely around September 26.

 

NEIC reported this earthquake of M 3.9 in the Andreanof Islands, Alaska was felt with intensity II-III in the area(s) of the Andreanof Islands, Alaska in Adak.

 

O: 25SEP2022 11:16:43  51.5N  177.0W mb=3.9  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 26SEP2022 146971    51.6N  177.6W 3.5-5.3 AAAAA  Andreanoff Isls, Aleutians 

 

M 5.3 IN MAURITIUS AND REUNION, RELATED TO TS NEWTON and MEXICO EARTHQUAKES

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 24, 2022

 

The strongest earthquake in the world today was an M 5.3 in the South Indian Ocean near Mauritius and Reunion Islands. It was not reported felt in this remote area. It is at the antipode of Tropical Storm Newton (compare 20N and 20S and 114W and 66E for antipodality). It is also near the antipode of the M 7.6 and 6.8 in Michoacan, Mexico of September 19 and 21, 2022 and was probably promoted by energy from those sources. 

 

"TS    NEWTON   2022-09-25  00:00 UT  19.5N  114.4W  040 kts  west of Michoacan, Mexico

TS Newton (TD 15E) continued today west of Michoacan, Nexico  with winds up to 40 kts. It is expected to track to the west and may enhance aftershocks in the next several days in Michoacan and Colima, Mexico. It may have helped promote the M 6.8 aftershock in Michoacan today." (September 22-24, 2022)

 

This is the strongest earthquake within about 200 km of this epicenter in the South Indian Ocean since an M 5.4 on January 5, 2013 and prior to that an M 5.4 on April 16, 2006. The strongest earthquakes in this region in the past 30 years have been M 5.4's.  Forecast 147011 had expected this event about 300 km to the north of this epicenter was likely around September 25.

 

O: 24SEP2022 17:00:29  20.1S   66.6E Mw=5.3  EMSC   MAURITIUS - REUNION REGION   

P: 25SEP2022 147011    17.0S   67.0E 4.0-5.6 ACAAA  So. Indian Ocean           

 

An unusual earthquake of M 4.3 occurred today in the area of southern Cuba. It may have lightly felt at Media Luna, Niquero, Cuba. This event was probably promoted by energy associated with Hurricane Ian which was passing near this epicenter at the time of this earthquake. This is an unusual event. The last earthquake of M>=4.3 within about 150 km of this epicenter was an M 4.6 and M 4.3 on May 17-18, 2020. An M 6.8 hit near this epicenter on May 25, 1992. This may be a long-period aftershock of that event.  Forecast 146826 had expected enhanced seismicity in this region to the west of this epicenter was likely around September 22.

 

O: 24SEP2022 20:01:42  19.7N   77.9W mb=4.3  EMSC   CUBA REGION                  

P: 22SEP2022 146826    19.0N   81.0W 3.5-5.5 AACAA  Caribbean Sea              

 

A moderate earthquake of M 4.8 occurred off the coast of northern California today. NEIC reported it was felt with maximum intensity IV at Ferndale. It was also felt with intensity II-III in northern California at Petrolia, Rio Dell, Loleta, Fortuna, Hydesville and Scotia among others. The last earthquake within about 150 km of this epicenter off the coast of northern California with equal or greater magnitude was an M 6.2 on December 20, 2021.  This may be related to stresses related to the landfall of Hurricane Fiona in Canada today as noted in previous issues of this summary:

 

 

"Hurricane Fiona continued north of the Turks and Cacos Islands near Bermuda as a category 4 storm with winds up to 130 kts. It is expected to track to the north making landfall with the North American Continental slope and rise in the next day. This could help promote seismicity along the western edge of the North American Plate and may have helped trigger the M 7.6 mainshock of September 19 and the 6.8 aftershock in Mexico today.  The area of northern California and north could see enhanced seismicity at this time. Some enhanced seismicity may also occur in eastern U.S. and Canada as this storm moves north in the Atlantic." (September 22-24, 2022)

 

Forecast 146950 had expected today's event within about 10 km was likely at the end of September.

 

O: 24SEP2022 19:27:37  40.3N  124.8W Mw=4.8  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 29SEP2022 146950    40.3N  124.7W 2.5-4.7 BAAAA  Off Coast of No. Calif     

 

An earthquake of M 4.8 also occurred in Southern Alaska today. NEIC reported it was felt with intensity II-III in Southern Alaska in Glennallen, Valdez, Copper Center, Palmer, Glirdwood, Chugiak, Eagle River, Wasilla, Anchorage. This is an unusual earthquake for the current period. It is the strongest earthquake within about 200 km of this epicenter since an M 4.8 on January 25, 2021 and prior to that an M 5.3 on November 27, 2017. The last within about 150 km of  larger magnitude was an M 5.3 on August 25, 2004.  Forecasts 146730  and 146992 had expected activity within about 50 km of this epicenter was likely between September 19 and 28.

 

O: 24SEP2022 15:18:53  61.5N  145.6W mb=4.8  EMSC   SOUTHERN ALASKA              

P: 19SEP2022 146730    61.4N  146.5W 3.2-5.2 BAAAA  Central Alaska              

P: 28SEP2022 146992    63.2N  145.5W 3.2-5.3 BBAAA  Central Alaska             

 

 

STRONG EARTHQUAKES FELT IN CHILE AND SUMATRA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 23, 2022

 

Two strong earthquakes were felt in the world today. These occurred in Sumatra, Indonesia (M 6.1-6.4) and in south-central Chile in the Los Lagos area.  The Chilean event of M 6.1 was felt in the Los Lagos area of Central Chile. NEIC reported it was felt with maximum intensity in Los Lagos at Castro, Puerto Varas and II-III in Ancud, Puerto Montt, Osorno, Valdivia, Baritoche Rio, Temuco, Arucania, Chile. GUC reported this earthquake was felt with intensity   V  in  Los Lagos at Ancud, Calbuco, Castro, Chaiten, Curaco de Velez, Frutillar, Maullin, Puerto Montt, Queilen, Quernchi, Quinchao, San Juan de al Costa, Bahia Mansa and IV in Quellon, Purranque, Puerto Varas, Hualaihue, Dalcahur, Chonchi, in Lo Rios with V in Valdivia III in Rio Bueno and in Aysen at Raul Marin Balmaceda, Chile. An earthquake of M 6.7 occurred about 250 km to the north of today's epicenter in Los Lagos on December 27, 2020 but the last event within about 200 km of today's epicenter of equal or larger magnitude than M 6.1 was an 6.4 on August 22, 1999 about about 150 km northeast of today's epicenter. Forecast 147034 had expected today's event was likely in this area around September 23. This epicenter is located at the third node (120 degrees) from the earthquake of M 7.6 of September 10, 2022 and was probably promoted by energy from that source.

 

O: 23SEP2022 22:53:26  41.3S   75.6W Mw=6.1  EMSC   OFF COAST OF LOS LAGOS, CHILE

O: 23SEP2022 22:53     41.4S   75.5W mb=6.0  GUC    Los Lagos at Ancud, Calbuco, C

P: 23SEP2022 147034    39.0S   73.0W 4.0-5.5 ACBAA  Central Chile              

 

An earthquake of M 6.2 was also widely felt in the area of Northern Sumatra and Malaysia today. NEIC reported intensity II-III in Banda Aceh, Indonesia, in Malaysia at Georgetown Pulau, Butterworth, Perai, and in Thailand at Phuket and Kathu.

BMG reported this earthquake with M 6.4 at 3.8N 96E. They reported maximum intensity IV in Aceh Selatan and Nagan Raya, Meulaboh, III in  Aceh Besar, Banda Aceh, Takengon, Bener Meriah, Simeulue and II in Pidie, Idi, Bireun, Aceh Tamiang, and Lansa. A foreshock about 100 km north of the M 6.4 occurred about half an hour prior to the mainshock. BMG reported it was felt with intensity IV in Takengon, Bener Meriah, and III in Idi, Reyeuk-Aceh, Timur and Aceh Barat Daya. While an M 5.9 occurred about 100 km west of this epicenter on March 5, 2022, the last earthquake within about 250 km of this epicenter with M>=6.2 per NEIC data was an 6.2 about 200 km southeast of today's epicenter on January 7, 2020 and an M 6.5 about 200 km north of this on December 6, 2016. The last definitely within the 200 km  radius zone was an M 6.4 on July 25, 2012. This followed a major event of M 8.6 about 300 km southwest of today's epicenter on April 11, 2012. Forecast 146801 had expected seismic activation in this region was likely to the southwest of today's epicenter around September 23. This epicenter is at 51.4 degrees (node 7) from the M 7.6 in Papua New Guinea of September 10, 2022 and near 144 degrees from the M 7.6 in Mexico of September 19, 2022 and was probably promoted by energy from those sources.

 

O: 23SEP2022 20:52:58   4.0N   96.1E Mw=6.2  EMSC   NORTHERN SUMATRA, INDONESIA  

P: 23SEP2022 146801     3.0N   94.0E 4.0-5.4 AABAA  Nicobar Islands            

 

Moderate aftershocks also continued in Michoacan, Mexico following mainshocks of M 7.6 on September 19 and M 6.8 on September 21. Among these was an M 5.2 felt with intensity IV in Armeria, Colima, Mexico and II-III in Colima, Manzanillo, in Jalisco at Guzman, Ajijio, Ocotlan and in Michoacan at Lazaro Cardenas and Zamora among others.  This event occurred with minutes of local solar noon and was probably promoted by Solar Flare Effects and/or tidal stresses which maximize near this hour. Seiche was also reported by the press to have occurred in the Southwestern U.S. in a cave following the M 7.6 in Mexico of September 19 but not after the M 6.8 aftershock of September 21. It was referred to as a "desert tsunami" an unusual terminology for a normal event. Following the M 7.6 in Lander, California in June, 1992, for example, seiche was widely observed in swimming pools in Colorado more than 2000 from the epicenter. Surface waves are largely responsible for the displacement of water following major earthquakes which result in sloshing of the water far from the earthquake epicenter.

 

Forecasts 146830 and 146841 had expected today's activity in Jalisco and Michoacan, Mexico was likely around September 23-24.

 

O: 23SEP2022 11:42:46  18.2N  103.3W ML=4.0  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 23SEP2022 18:26:00  18.5N  103.7W Mw=5.2  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 23SEP2022 07:57:19  18.2N  103.1W ML=4.0  EMSC   OFFSHORE MICHOACAN, MEXICO   

P: 23SEP2022 146830    18.0N  104.0W 3.5-6.4 AAAAA  Coast of Jalisco, Mexico   

P: 24SEP2022 146841    18.0N  103.0W 3.5-6.1 AAAAA  Michoacan, Mexico          

 

A moderately strong solar flare of M1.7 (#4130) occurred today maximizing around 18:10-18:24 UT according to data from SWPC. This is the strongest solar flare since  The aftershock in Michoacan occurred near the maximum of this flare and may have been promoted by SFE from it. An M 3.5 also occurred off the coast of Oregon within a minute of the Michoacan event and may also have been promoted by SFE. Other moderate earthquakes closely associated with flare 4130 occurred in Western Honshu (M 4.0); Fiji (M 5.3); northern Peru (M 4.6) and Argentina (M 4.2). An M 6.2 followed the flare two hours later in Northern Sumatra at the same time as an M 5.4 in the Banda Sea. These may also have been promoted by SFE associated with flare 4130. This is the strongest solar flare in the past week - since an M1.9 on September 17, 2022 (#2380).  It occurred with SWPC parameters:

 

SOLAR FLARE ACTIVITY

 

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

#-------------------------------------------------------------------------------

 

4130       1748   1810      1841   M1.7      (September 23, 2022)   3.8E-02  

 

 

The strongest earthquake in the U.S. or Canada today was an M 3.4-3.8 in Hawaii. NEIC reported this earthquake of M 3.5-3.8 in Hawaii was felt with intensity II-III in the area(s) of Hawaii in Hawaii National Park, Volcano, Mountain View, Hilo, Keaau and Papaikou. This continues enhanced seismicity in the area following the earthquakes in  Mexico of September 19 and 21. Forecast 146833 had expected this event within about 25 km was likely around September 24.

 

O: 24SEP2022 06:43:50  19.3N  155.4W ML=3.8  EMSC   ISLAND OF HAWAII, HAWAII     

P: 24SEP2022 146833    19.3N  155.2W 3.0-4.5 AAAAA  Hawaii                     

 

An unusual earthquake of M 2.6 also occurred today in the region of Newfoundland, Canada. This occurred as Hurricane Fiona passed near this epicenter as noted in this and previous issues of this summary as:

 

"Hurricane Fiona continued  over Nova Scotia today with winds up to 100 kts. It is expected to track to the north making landfall with Nova Scotia today. This appears to be one of the strongest storms to hit Nova Scotia in recent years. This could help promote seismicity along the western edge of the North American Plate.  The area of northern California and north could see enhanced seismicity at this time. Some enhanced seismicity may also occur in eastern U.S. and Canada as this storm moves north in the Atlantic." (September 23-24, 2022)

 

It is likely that this earthquake was promoted by energy associated with the passage of Hurricane Fiona.

 

O: 22SEP2022 21:12:59  48.4N   57.5W MB=2.6  ECAN of Corner Brook, NL            

 

MODERATE QUAKES FELT IN ITALY; COOK STRAIT, NEW ZEALAND

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 22, 2022

 

A moderate earthquake of M 4.6 shook areas of northern Italy today. NEIC reported maximum intensity IV in Toano Emilia-Romagna and II-III in Toscana, Italy at Coreglia Antelminelli, Camporgiano, Pistoia, Lucca, Pisa. A foreshock of M 4.4 in Ligurien, Italy was felt with intensity V in Bogliasco, Genoa, IV in Recco, and II-III in Camogli, Santa Margherita, Portofino, Zoagli, La Spazia, Milan. These are the strongest earthquakes in northern Italy within about 100 km of  these epicenters since an M 4.7 on February 9, 2022 and prior to that an M 4.6 on December 29, 2020. The last earthquake of significantly larger magnitude in this area was an M 4.8 on December 9, 2019 and an M 4.9 on November 19, 2017. Forecasts 146661, 146660 and 146670  had expected this activity in northern Italy was likely in mid- to late September.

 

O: 22SEP2022 10:24:50  42.8N   13.6E ML=4.1  EMSC   CENTRAL ITALY                

P: 14SEP2022 146670    43.0N   13.0E 3.0-5.1 CAAAA  Italy                      

 

O: 22SEP2022 15:47:56  44.2N   10.5E ML=4.0  EMSC   NORTHERN ITALY               

O: 22SEP2022 15:47:56  44.2N   10.5E ML=4.6  ANSS   NORTHERN ITALY               

P: 14SEP2022 146670    44.0N    7.0E 3.0-5.0 AAAAA  Italy                      

P: 16SEP2022 146661    46.0N   11.0E 3.0-5.1 CBAAA  Austria                    

 

O: 22SEP2022 13:40:00  44.4N    9.1E ML=4.1  EMSC   NORTHERN ITALY               

O: 22SEP2022 13:40:00  44.4N    9.1E ML=4.4  ANSS   NORTHERN ITALY               

P: 18SEP2022 146660    46.0N    8.0E 3.0-5.3 BBAAA  Austria                    

P: 14SEP2022 146670    44.0N    7.0E 3.0-5.0 CABAA  Italy                      

 

A moderate earthquake of M 5.2-5.8 shook areas surrounding the Cook Strait, New Zealand today. NEIC reported this event with This moderately  large earthquake was also reported in the French Pass region of Northern South Island, New Zealand. GEONET gives this NEIC reported this event with maximum intensity V in New Zealand in Wellington at Porirua, Blenheim, Marlborough; IV in Richmond, Tasman, Nelson, Lower Hutt, Wellington and III in Picton, Marlborough, Kapiti, and Otaki among others. GEONET reported this earthquake was felt with moderate to strong intensity in the area southeast of Wellington, New Zealand and in southern North Island and northern South Island. 44548 reports of felt events were made of which 11817 reported weak and 23641 light intensity with 8145 report of moderate shaking and 866 with strong and 35 severe and 44 with extreme intensity came from the area.  Seismicity in this area had been anticipated in this summary to be enhanced following the major earthquakes in Michoacan, Mexico as reported in the issue of September 19 as:

 

 

"Areas likely to see far-field seismic enhancement from this earthquake include:

P- and S- shadow zone edge and node 7 (101-110 degrees): Mexico to Greece. Turkey, Vanuatu, Hokkaido, Southern Mid-Atlantic, Lake Baykal, Mariana Islands, South Island, New Zealand, Volcano Islands, Greece, SE Honshu, Japan, Bonin Islands, Central Japan, New Guinea," (September 19-20, 2022)

 

Today's earthquake in New Zealand was located near 100 degrees from the strong earthquakes in Mexico and may have been promoted by energy from those sources.

 

Forecasts 146784 and 147041 had expected today's event was likely within about 100 km around September 20-23.

 

 

O: 22SEP2022 09:07:04  40.8S  174.2E Mw=5.2  EMSC   COOK STRAIT, NEW ZEALAND     

O: 22SEP2022 09:07:06  40.8S  174.2E MS=5.8  GEONET Felt with moderate to strong intensity

P: 20SEP2022 146784    40.0S  174.0E 3.0-4.5 AAAAA  North Island, N.Z.         

P: 23SEP2022 147041    40.0S  174.0E 3.0-4.4 AAAAA  North Island, N.Z.         

 

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 off the cost of Oregon. It was not reported felt in this remote area. It occurred within minutes of local solar midnight and was probably promoted by high tidal stresses which maximize near this hour. Forecast 146951 had expected enhanced seismicity within about 50 km of this epicenter was likely around September 22.

 

O: 22SEP2022 08:47:50  43.5N  127.1W mb=3.9  EMSC   OFF COAST OF OREGON          

P: 22SEP2022 146951    43.1N  126.5W 3.0-4.7 AAAAA  Off Coast of Oregon         

 

A light earthquake of M 3.1-3.5 also shook regions of northerm Washington State near Seattle today.  NEIC reported this earthquake of M 3.5 in Washington State was felt with intensity II-III in the area(s) of Washington State in Forks, Sequim, Langley, Seattle, Snohomish, Redmond, Rockaway Beach and Beaverton and in Parksville, British Colombia, Canada. This is the strongest earthquake within about 100 km of this epicenter since an M 4.5 on January 24, 2020. At the time this summary noted in regard to seismicity in this region:

 

 

"An earthquake of M 4.5 also occurred today west of Washington State and British Columbia. NEIC reported maximum intensity III in British Columbia at Ucluelet, Port Alberni, Lake Cowichan, Sooke, Parksville and Duncan and in Washington at Sekiu, Clallam, Beaver, Forks. This epicenter is near the longitude of maximum tidal stress for this new moon and, like the earthquakes in Turkey was probably enhanced by those stresses. This is an unusual epicenter and the event occurred within an hour of local solar noon, suggesting the influence of tidal stresses with the new moon. Today's event is the strongest within about 200 km of this epicenter since an M 4.9 on December 30, 2015 about 200 km east of today's epicenter and M 4.8 within about 100 km on January 8, 2015." (January 25, 2020)

 

Forecast 146965 had expected this event in this region was likely around September 28

 

O: 22SEP2022 14:41:56  48.1N  124.7W Ml=3.5  EMSC   OFFSHORE WASHINGTON          

O: 22SEP2022 14:41:56  48.1N  124.7W Ml=3.5  ANSS   OFFSHORE WASHINGTON          

O: 22SEP2022 14:41:57  48.1N  124.7W MB=3.1  ECAN of Port Renfrew, BC  

P: 28SEP2022 146965    48.9N  123.1W 2.0-3.9 CABAA  Washington state, U.S.     

MAJOR AFTERSHOCK SHAKES MICHOACAN, MEXICO

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 21, 2022

 

 

A strong to major aftershock of the M 7.6 earthquake in Michoacan, Mexico occurred today. This event of M 6.8 occurred within minutes of local solar midnight and was probably promoted by tidal and geomagnetic effects which maximize near this hour. At least two additional persons were killed by this earthquake - one by a heart attack and a second after falling down stairs after hearing earthquake alarms. Additional damage and injuries were sustained in this quake. Two were also killed in the mainshock of September 19. NEIC reported it was felt with maximum intensity VIII in Michoacan at Arteaga; IV in La Orilla, V in Armenia and Comala, Colima; IV in Lazaro Cardenas, Michoacan, Colima, Colima, Villa de Alvarez and La Huscana. Many were panicked by this late night earthquake. No tsunami was expected with today's event. The timing of this earthquake is similar to the M 7.6 in 1985 which followed the M 8.2 of September 19, 1995. That aftershock occurred on September 21, 1985, and like that today added damage to the mainshock. Both of these aftershocks occurred east of their respective mainshock two days after. This event was noted in the previous issue of this summary in the "HISTORY" section as:

 

" 9 21  1 37 13 1985  17.802 -101.647  31 7.6   Michoacan, Mexico

 

Aftershock of the Mexico City earthquake of Sept. 19, 1985. This earthquake caused additional casualties and damage with maximum intensity up to VI in Mexico City. It was felt throughout central Mexico. A tsunami was generated which was recorded at Acapulco with 1.4 meters. Well fluctuations were recorded at Santa Fe, N. M." (September 21, 2022)

 

Today's major aftershock in Michoacan today may have been promoted by Hurricane Newton which continued near this epicenter to the west of Michoacan, Mexico today. The effect of this storm on the aftershock pattern had been noted in the previous issue of this summary as:

 

"TD 15E formed today southwest of Michoacan, Nexico  with winds up to 40 kts. It is expected to track to the west and may enhance aftershocks in the next several days in Michoacan and Colima, Mexico." (September 20, 2022)

 

Forecasts 146830 and 146841 had expected today's activity was likely around September 23-24 as a strong aftershock of the M 7.6 of September 19, 2022 in Michoacan and Jalisco, Mexico.

 

O: 21SEP2022 11:52:21  17.9N  103.1W ML=4.2  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 21SEP2022 18:47:35  18.0N  103.4W ML=4.0  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 21SEP2022 07:21:34  18.1N  103.3W ML=4.0  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 22SEP2022 03:58:07  18.1N  103.3W ML=4.1  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 22SEP2022 06:50:54  18.1N  103.2W ML=4.1  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 21SEP2022 07:48:10  18.2N  103.8W ML=4.0  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 21SEP2022 15:59:23  18.2N  103.4W ML=4.0  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 21SEP2022 20:10:17  18.2N  103.7W ML=4.1  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 22SEP2022 06:16:09  18.3N  102.9W Mw=6.8  EMSC   MICHOACAN, MEXICO

O: 21SEP2022 09:36:29  18.5N  103.9W ML=4.1  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 22SEP2022 09:00:49  18.5N  103.9W ML=4.5  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 22SEP2022 09:14:59  18.5N  103.8W ML=4.2  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 21SEP2022 06:19:15  18.6N  103.6W ML=4.0  EMSC   MICHOACAN, MEXICO

O: 21SEP2022 15:20:02  18.6N  103.6W ML=4.0  EMSC   MICHOACAN, MEXICO

O: 21SEP2022 19:17:17  18.7N  103.4W ML=4.2  EMSC   MICHOACAN, MEXICO

O: 22SEP2022 09:06:30  18.8N  103.8W ML=4.3  EMSC   OFFSHORE COLIMA, MEXICO      

P: 23SEP2022 146830    18.0N  104.0W 3.5-6.4 AAAAA  Coast of Jalisco, Mexico   

P: 24SEP2022 146841    18.0N  103.0W 3.5-6.1 AAAAA  Michoacan, Mexico          

 

 

A moderate earthquake of M 4.0 occurred in the region of the Dominican Republic today. NEIC reported it was felt with intensity II in Santo Domingo. It was accompanied by earthquakes of M 3.7 and M 3.8 in Puerto Rico. This may be a reaction to the stresses associated with Hurricane Fiona which passed over this epicenter two days ago. This summary had noted this possibility in previous issues as:

 

 

"TS Fiona continued north of Dominican Republic with winds up to 115 kts. Major flooding and complete power outage occurred on Puerto Rico today. It is expected to track to the north and west over the next several days. It could help promote enhanced seismicity in the region of Puerto Rico and the Dominican Republic in the next several days." (September 19-21, 2022)

 

This activity had been expected in forecasts 146851 and 146852 around September 21-24. This activity is located at 144 degrees from the M 7.0 in Luzon, Philippines of July 27 and the M 7.6 in New Guinea of September 10, 2022 and was probably promoted by energy from those sources.

 

O: 22SEP2022 04:49:33  19.3N   67.2W Md=3.8  EMSC   PUERTO RICO REGION

O: 21SEP2022 09:06:02  18.1N   69.7W ML=3.0  EMSC   DOMINICAN REPUBLIC REGION    

P: 24SEP2022 146852    19.0N   71.0W 3.4-5.1 BAAAA  Puerto Rico                

 

O: 22SEP2022 02:57:12  18.7N   68.1W ML=3.7  EMSC   DOMINICAN REPUBLIC REGION    

P: 21SEP2022 146851    18.0N   66.0W 3.4-5.1 ABAAA  Puerto Rico                

 

O: 21SEP2022 12:40:16  19.8N   71.6W ML=3.5  EMSC   DOMINICAN REPUBLIC           

O: 21SEP2022 12:40:16  19.8N   71.6W ML=4.0  ANSS   DOMINICAN REPUBLIC           

P: 24SEP2022 146852    19.0N   71.0W 3.4-5.1 BAAAA  Puerto Rico                

 

A moderately strong M 5.7 also occurred today as an aftershock of the M 7.6 in Papua New Guinea of September 10. NEIC reported it was felt with intensity IV in New Guinea at Lae, Kainantu, Goroka and III in Fort Moresby. This event is about 100 km southwest of the mainshock of September 10 and may have been promoted by regional stress redistribution.

Forecast 146811 had expected this activity was likely to be enhanced around September 22-23.

 

O: 21SEP2022 09:30:47   5.5S  147.0E Mw=5.7  EMSC   EASTERN NEW GUINEA REG., P.N.G

P: 22SEP2022 146811     6.0S  146.0E 4.0-5.4 AAAAA  New Ireland                

P: 22SEP2022 146811     6.0S  148.0E 4.0-5.5 AAAAA  New Ireland                

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 off the coast of Oregon. It was not reported felt in this remote area. It occurred within minutes of local solar midnight and was probably promoted by high tidal stresses which maximize near this hour. Forecast 146951 had expected enhanced seismicity within about 50 km of this epicenter was likely around September  22.

 

O: 22SEP2022 08:47:50  43.5N  127.1W mb=3.9  EMSC   OFF COAST OF OREGON           

P: 22SEP2022 146951    43.1N  126.5W 3.0-4.7 AAAAA  Off Coast of Oregon        

 

A moderately  large earthquake was also reported in the French Pass region of Northern South Island, New Zealand. GEONET gives this M 5.2 (MC) - 5.8 (GEONET).  GEONET reported this earthquake was felt with moderate to strong intensity in the area southeast of Wellington, New Zealand and in southern North Island and northern South Island. 44548 reports of felt events were made of which 11817 reported weak and 23641 light intensity with 8145 report of moderate shaking and 866 with strong and 35 severe and 44 with extreme intensity came from the area.  Seismicity in this area had been anticipated in this summary to be enhanced following the major earthquakes in Michoacan, Mexico as reported in the issue of September 19 as:

 

 

"Areas likely to see far-field seismic enhancement from this earthquake include:

 

P- and S- shadow zone edge and node 7 (101-110 degrees): Mexico to Greece. Turkey, Vanuatu, Hokkaido, Southern Mid-Atlantic, Lake Baykal, Mariana Islands, South Island, New Zealand, Volcano Islands, Greece, SE Honshu, Japan, Bonin Islands, Central Japan, New Guinea," (September 19-20, 2022)

 

Today's earthquake in New Zealand was located near 100 degrees from the strong earthquakes in Mexico and may have been promoted by energy from those sources.

 

Forecasts 146784 and 147041 had expected today's event was likely within about 100 km around September 20-23.

 

O: 22SEP2022 09:07:04  40.8S  174.2E Mw=5.2  EMSC   COOK STRAIT, NEW ZEALAND     

O: 22SEP2022 09:07:06  40.8S  174.2E MS=5.8  GEONET Felt with moderate to strong intensity

P: 20SEP2022 146784    40.0S  174.0E 3.0-4.5 AAAAA  North Island, N.Z.         

P: 23SEP2022 147041    40.0S  174.0E 3.0-4.4 AAAAA  North Island, N.Z.          

 

A pair of moderate earthquakes also occurred in the area east of Tokyo, Japan today. This summary had expected enhanced seismicity in Japan at this time in previous issues as several typhoons have passed over the area in the last few days, including Super-Typhoon Nanmadol. This summary had expected this relation in previous issues as:

 

"Typhoon Nanmadol (TD 16W) continued today over central Honshu, Japan with winds up to 55 kts. It is expected to track to the northeast over the next several days. A moderate to strong earthquake is possible as this storm passes through  southern and central Japan. This is most likely around September 20-21 in Honshu, Japan." (September 19-20, 2022)

 

Forecasts 146885 and 146903 had expected this enhanced activity was likely between September 22 and 26 within about 100 km of these epicenters.

 

O: 21SEP2022 22:36:52  35.3N  141.3E mb=4.8  EMSC   NEAR EAST COAST OF HONSHU, JAPAN

O: 21SEP2022 22:24:43  35.3N  141.2E Mw=5.0  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 22SEP2022 146885    35.0N  139.0E 3.5-5.1 AABAA  Central/So. Honshu Japan   

P: 26SEP2022 146903    36.0N  141.0E 4.0-5.6 BAAAA  Off East Coast Honshu      

 

Two moderate earthquakes also occurred south of Iceland in the Northern Mid-Atlantic Ridge today with M 4.5 and 4.8. This may have been affected by stresses associated with Tropical Storm Gaston which is currently in the area as noted in this summary:

 

"TS Gaston continued in the area west of the Azores Islands in the North Atlantic with winds up to 65 kts. An M 4.9 near this epicenter occurred on September 20, 2022 and may have been triggered by stresses from this storm. More such activity in the North Atlantic may continue in the next several days." (September 21, 2022)

 

Forecast 146716 had expected this event within about 100 km was likely around September 17. This epicenter is located at 144 degrees from the M 7.0 in the Loyalty Islands of September 14, 2022 and at 102 degrees from the M 6.9 in  Taiwan of September 18, 2022  and was probably promoted by energy from those sources.

 

O: 21SEP2022 08:25:34  52.7N   31.8W mb=4.8  EMSC   NORTHERN MID-ATLANTIC RIDGE

O: 21SEP2022 11:49:40  52.7N   31.5W mb=4.5  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 17SEP2022 146716    52.0N   30.0W 4.0-5.6 BAAAA  North Mid-Atlantic Ridge   

 

An earthquake of M 3.0 occurred today in the Sao Paulo region of Brazil today. The only event of larger magnitude within about 300 km of this epicenter in the past 30 years recorded by NEIC was an M 4.1 on May 22, 1998. An M 2.9-3.0 was also registered on July 26, 2018 about 300 km west of today's epicenter. Today's event is located near the antipode of the M 6.9 in Taiwan of September 14 and at the antipode of TD 17 and may have been promoted by energy from those sources.

 

O: 21SEP2022 08:50:54  21.7S   46.7W ML=3.0  EMSC   INAS GERAIS-SAO PAULO, BRAZIL

 

STRONG QUAKE SHAKES KOMANDORSKY ISLANDS, RUSSIA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 20, 2022

 

The strongest earthquake in the world today was an M 6.0 in the Komandorsky Islands, Alaska. It may have been lightly felt as far as Alaska.

The last earthquake of larger magnitude than M 6.0 in the Komandorsky Islands occurred as an M 6.6 to the west of today's event on March 16, 2021. These may be regional aftershocks of a major M 7.7 of July 17, 2021 about 100 km southeast of today's epicenter. Forecasts 146713 and 146977 had expected this activity in the Komandorsky Islands was likely between September 16 and 21 within about 100 km of the epicenter.

 

O: 20SEP2022 18:23:43  55.5N  166.4E Mw=6.0  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 20SEP2022 18:56:18  55.6N  166.0E mb=4.2  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 20SEP2022 18:22:33  55.5N  166.3E mb=4.5  EMSC   KOMANDORSKIYE OSTROVA REGION 

P: 16SEP2022 146713    56.0N  163.0E 4.0-5.6 BABAA  Komandorsky Isl            

P: 21SEP2022 146977    56.0N  166.0E 4.0-5.8 AAAAA  Komandorsky Isl            

 

The strongest earthquake in the U.S. or Canada today was an M 4.9-5.1 in the Alaska Peninsula region. It may have been lightly felt in the Chignik area or Alaska. The last earthquake with significantly larger magnitude within about 150 km of this epicenter in the Alaska Peninsula was an M 6.9 on October 11, 2021. Similar sized earthquakes around M 5.1 occurred more recently in this area on August 17, and June 2, 2022. Forecast 146969 had expected today's earthquake in this region was likely  around September 21.

 

O: 20SEP2022 08:37:40  56.3N  156.5W Mw=5.1  EMSC   ALASKA PENINSULA             

P: 21SEP2022 146969    55.7N  156.9W 3.5-4.9 AAAAA  Alaska Peninsula           

 

 

A strong swarm of light earthquakes occurred in Hawaii today. The largest of these was an M 3.4 which was felt with intensity II-III in Hawaii at Naalehu, Captain Cook, Holualoa, Kailua Kona and Princeville. An earlier M 3.4 was felt with intensity II-III in Kailua Kona, Waikoloa, Kealakekua, Kamuela, Kapaau, Captain Cook, Paauilo, Honokaa, Pahala, Ookala. This may be part of a reenergized eruption of Kilauea. The M 3.4 occurred north and west of the island of Hawaii and may be an aftershocks of an M 3.8-4.0 of September 16, 2022. At the time this summary noted in this regard:

 

 

"An unusual M 3.4-3.8 also shook the Hawaiian Island of Maui today. The only earthquake of M>=3.4 in the Maui region in the past two years occurred as an M 3.4  on June 21, 2021 and was noted in this summary at the time as:

 

"An unusual M 3.4 hit the Maui region of Hawaii today.  NEIC reported this earthquake of M 3.3 in Maui, Hawaii was felt with intensity II-III in the area(s) of Maui, Hawaii at Hawi, Waikoloa, Kamuela, Kailua Kona, Honokaa, Kula and Captain Cook. This is the strongest earthquake in Maui since a M 3.6-3.8 on September 5, 2020." (June 21-22, 2021)

 

Like today's event that of June, 2021 was accompanied by an M 6.0 in the central Kermadec Islands of New Zealand near the M 5.7 in that area today.

Forecast 146587 had expected today's event in Maui was likely within about 50 km around September 18.

 

NEIC reported this earthquake of M 3.8 in Maui, Hawaii was felt with intensity II-III in the area(s) of Maui, Hawaii in Lanai City, Kihei, Lahaina, Kula, Wailuku, Makawao, Kaunakakai, Kualapuu and Kamuela. This epicenter is at the seventh node (52 degrees) from the M 7.0 in the Loyalty Islands of September 14, 2022 and may have been promoted by energy from that source." (September 17, 2022)

 

Forecasts 146587, 146566 and 146833 had expected enhanced seismicity in Hawaii at this time within about 10-30 km of these epicenters.

 

O: 21SEP2022 04:25:13  19.3N  155.5W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII     

P: 17SEP2022 146566    19.3N  155.1W 3.0-4.4 BAAAA  Hawaii                      

P: 24SEP2022 146833    19.3N  155.2W 3.0-4.5 BAAAA  Hawaii                     

 

O: 20SEP2022 15:20:22  19.8N  156.1W ML=3.4  EMSC   HAWAII REGION, HAWAII        

P: 18SEP2022 146587    20.1N  156.1W 4.0-5.4 AAAAA  Hawaii area                 

 

Moderate to strong aftershocks continued today in the region of Colima, Jalisco and Michoacan, Mexico following the M 7.6 in Michoacan on September 19, 2022. These were felt widely with moderate intensity in Manzanillo, Colima, Paracho, Michoacan, in Jalisco in Guadalajara, Zapopan, and in the area of Mexico City and Tlalnepantla. The strongest aftershock in the area today was an M 5.8-5.9. It was reported by NEIC to have been felt with intensity IV in Pihuamo, Jalisco and Manzaniloo and Colima, Colima and III in Villa de Alvarez, Colima and in Comala, Colima and in Jalisco at San Patricio, El Grullo and El Limon. Forecasts 146840 and 146830 had expected this activity around September 20.

 

O: 20SEP2022 16:03:12  18.1N  103.2W ML=4.0  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 21SEP2022 04:02:27  18.1N  103.1W ML=4.1  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 21SEP2022 05:59:35  18.1N  103.5W ML=4.0  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 21SEP2022 04:44:34  18.2N  103.2W ML=4.0  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 20SEP2022 10:43:18  18.3N  102.9W Mw=4.7  EMSC   MICHOACAN, MEXICO

O: 21SEP2022 00:06:04  18.3N  103.5W ML=4.1  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 20SEP2022 11:51:41  18.4N  103.8W ML=4.3  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 20SEP2022 19:04:29  18.4N  103.1W mb=4.9  EMSC   MICHOACAN, MEXICO

O: 20SEP2022 23:18:33  18.4N  104.3W ML=4.1  EMSC   OFFSHORE COLIMA, MEXICO

O: 20SEP2022 08:17:18  18.6N  103.5W Mw=5.9  EMSC   MICHOACAN, MEXICO

O: 21SEP2022 06:19:15  18.6N  103.6W ML=4.0  EMSC   MICHOACAN, MEXICO

O: 20SEP2022 14:26:26  18.0N  103.4W ML=4.4  EMSC   OFFSHORE MICHOACAN, MEXICO   

P: 21SEP2022 146840    17.0N  101.0W 3.5-5.4 ABBAA  Michoacan, Mexico          

P: 23SEP2022 146830    18.0N  104.0W 3.5-6.4 AAAAA  Coast of Jalisco, Mexico   

 

 

 

The strongest earthquake in the U.S. today outside Alaska was an M 3.6-4.0 in Northern California.  NEIC reported this earthquake of M 4.0 in Northern California was felt with intensity II-III in the area(s) of Northern California in Covelo, Willits, Fort Bragg. Several light aftershocks were also felt in the epicentral area. This is the strongest earthquake within about 50 km of this epicenter in Northern California since an M 4.1 on November 4, 2021 and an M 4.3 occurred on December 14, 2017. The last of significantly larger magnitude in this area was an M 4.9 on January 19, 2008.  A series of light aftershocks followed the M 4.0. Forecasts 146610 and 146884 had expected today's activity within this area was likely around September 19-21.

 

O: 20SEP2022 14:08:26  39.8N  123.2W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 20SEP2022 14:12:13  39.8N  123.2W ML=2.4  EMSC   NORTHERN CALIFORNIA

O: 20SEP2022 14:31:31  39.8N  123.2W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 20SEP2022 15:01:45  39.8N  123.2W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 20SEP2022 16:42:13  39.8N  123.2W Md=2.1  EMSC   NORTHERN CALIFORNIA

O: 20SEP2022 14:03:07  39.8N  123.2W ML=3.6  EMSC   NORTHERN CALIFORNIA          

O: 20SEP2022 14:03:07  39.8N  123.2W ML=4.0  ANSS   NORTHERN CALIFORNIA          

P: 19SEP2022 146610    39.2N  123.1W 2.5-4.8 AAAAA  Central California         

P: 21SEP2022 146884    39.0N  123.1W 2.5-4.8 AAAAA  Central California         

 

Unusual activity in the area of Northern New Zealand near Taupo and in Tonga near the site of the massive volcanic eruption there earlier this year suggest areas to be watched for further geological significance may occur in the future.

 

MAJOR EARTHQUAKE DAMAGING, DEADLY IN MICHOACAN, COLIMA, MEXICO

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 19, 2022

 

The strongest earthquake in the world today was a major event of M 7.6 in Michoacan, Mexico. Several triggers acting together probably helped enhance this earthquake. These included triggering effects from Tropical Storms, Geomagnetic storms, and other earthquakes.  This follows a similar M 7.6 in Papua New Guinea on September 10, 2022, the strongest in the world more than a year as noted in this summary at the time:

 

“A major earthquake of M 7.6-7.7 struck Papua New Guinea today … This earthquake is the strongest earthquake in the earth in more than a year. The last event of M>=7.6 occurred in the South Sandwich Islands on August 12, 2021 with M 8.1 and prior to that in the Alaska Peninsula on July 29, 2021." (September 11, 2022)

 

NEIC reported the earthquake in Michoacan, Mexico was felt with strong intensity IX in Michoacan at Coshuayana and VUU in Coalcoman. It was also felt with intensity VI in Colima at Colima, Cuauhtemoc, Villa de Alvarez, Colima, Suchitlan, and in Tecalitalan and Pihuamo, Jalisco, Mexico. Foreshocks hit within about 150 km of this epicenter with M 6.1 of September 2, 2022 and M 5.9 on August 13, 2022. A national earthquake drill commemorating the M 8.1 on September 19, 1985  occurred  about an  hour before this earthquake. It is possible that this drill helped save many from death or injury from today's earthquake as they were outdoors and aware of the possibility of a quake at that time. A tsunami warning was issued and later revise. Fluctuation of ocean up to about a foot (0.3 meters) were reported. Gauges in Mexico registered maximum tsunami height of 0.8 m in Manzanillo, 0.5 m in Zihuatanejo and 0.1 in Acapulco. Tsunami waves of 0.12 meters (0.4 feet) were also reported in the Galapagos Islands with similar waves in Lazaro Cardenas, Mexico, Zihuatanejo and Puerto Vallarta, Mexico by PTWC. At least one person was killed when a facade of a department store fell on a man in Manzanillo. A second was killed when falling portions of a Mall hit him. At least 7 were injured but the toll continues to rise as rescue workers begin their work. At least 20 hospitals in Michoacan were damaged. Damage was also reported to hotels, medical facilities, churches and colleges in Coalcoman. More than a million people lost power in the quake. Earthquakes within about 300 km of today's epicenter of M>=7.2 hit this area on April 18, 2014 (M 7.2), January 22, 2004 (M 7.5), January 11, 1997 (M 7.2).

The only earthquake of larger magnitude in this area in the past 30 years was an M 8.0 on October 8, 1995. An M 8.1 also occurred in this region of Michoacan exactly 37 years ago - on September 19, 1985. This was widely damaging with more than 35,000 acknowledged deaths especially in the region of Mexico City. It may be the most deadly earthquake recorded in the region of North and Central America since records began. Another deadly earthquake hit this area on September 19, 2017. That event of M 7.1 also caused much damage and deaths in the area. At the time this summary noted regarding this event exactly five years ago as:

 

"A major earthquake of M 7.1 hit the Mexican State of Puebla today, apparently dropping the other shoe anticipated in this summary of September 12. This deadly earthquake was widely felt in the area of Mexico City and surroundings where it was deadly and caused buildings to collapse. A state of disaster has been declared for Mexico City. … More than 250 were confirmed dead in this earthquake which hit about 120 km south of Mexico City near local solar noon. The devastated remains of schools, apartment buildings, homes and businesses throughout the area were being searched for survivors. The quake occurred hours after an earthquake drill commemorating the 32nd anniversary of Mexico's deadiest quake - an M 8.1 on September 19, 1985 which killed more than 35,000. Today's quake while not as large or deadly occurred much closer to Mexico City. Confirmed deaths per state included: Morelos 72; Puebla 43; Mexico City 117; Mexico State 12; Guerrero 3 and Oaxaca 1. Thousands were injured and many children were missing in collapsed schools. The timing of the quake near noon was particularly bad for school children most of whom were in school at the time. At least 44 high rise buildings in Mexico City collapsed or were severely damaged in the quake. Because Mexico City is built on filled soil in an old swamp shaking is amplified and often leads to higher destructive power of large earthquakes. Tolls in all categories of death and destruction will rise in coming days. It is the worst quake in Mexico City since September 1985. A second quake on September 21, 1985 of M 7.1 contributed to the damage and deaths in that catastrophe." (September 19-20, 2017)

 

A published statistical study of earthquakes reported a 1 in 133,000 likelihood That three major earthquakes in this region of Mexico in the past 100 years would occur on the same day of the year.

 

Areas likely to see far-field seismic enhancement from this earthquake include:

 

Antipodal (~180 degrees): South Indian Ocean

Outer shadow zone edge (141-148 degrees): Mexico to Minahassa, Sea of Bengal, Australia, SE Indian Ridge, Java, Andaman Islands, 

Node 3 (120 degrees): Mexico to Bismarck Sea, New Guinea, Taiwan, Northern Philippines, Sumbawa, Tajikistan, 

P- and S- shadow zone edge and node 7 (101-110 degrees): Mexico to Greece. Turkey, Vanuatu, Hokkaido, Southern Mid-Atlantic, Lake Baykal, Mariana Islands, South Island, New Zealand, Volcano Islands, Greece, SE Honshu, Japan, Bonin Islands, Central Japan, New Guinea,

Node 4 (90 degrees): Mexico to Algeria, Germany, Kermadec Islands, Fiji Islands

Node 5 (72 degrees): Mexico to Jan Mayen, Rat Islands, 

Node 6 (60 degrees): Mexico to Northern Alaska, Easter Island, Hawaii, Nunavit, Canada, 

Node 7 (52 degrees): Mexico to NWT, Yukon, Canada, SE Alaska, Hawaii, Bolivia, NT, Canada, Central Chile,

 

The Michoacan mainshock occurred within minutes of local solar noon, a time when strong tidal stresses help promote seismicity. It also occurred near the antipode of several moderately large earthquakes in the Mid-Indian Ocean and may have been promoted by surface energy from that event and at the third node (120 degrees) from Taiwan of  September 17, 2022 (M 6.9). It also occurred at the peak of a moderate geomagnetic storm with KP 5.

 

In addition to stresses associated with local tropical storms, the M 7.6 in Michoacan, Mexico today was located at 103 degrees from the location of the landfall today of Typhoon Nanmadol in Central Honshu, Japan. Surface energy from major disturbances concentrate at this distance from those sources and can help trigger seismicity at this distance. Nanmadol did extensive damage in Japan on landfall today. 

 

"Typhoon Nanmadol (TD 16W) continued today over central Honshu, Japan with winds up to 65 kts. It is expected to track to the northeast over the next several days. A moderate to strong earthquake is possible as this storm passes through  southern and central Japan. This is most likely around September 20-21 in Honshu, Japan." (September 18-19, 2022)

 

Today's seismicity in Michoacan, Mexico had been expected and outlined in the previous issue of this summary as:

 

 

Another area where seismicity is likely to be impacted by a tropical storm in the next several days is central and western coastal Mexico where two tropical storms are near or at landfall at this time. Tropical Storm Lester dissipated over the region of Guerrero and Michoacan Mexico today. This is the first storm of the season to make landfall in Mexico. First landfalls often trigger unusually large earthquakes in seismically active areas such as Michoacan. Twenty-seven years ago today, this area suffered from one of the strongest great earthquakes in region of Central and North America occurred as noted in the earthquake summary yesterday:

 

" 9 19 13 17 47 1985  18.190 -102.533  28 8.1   Michoacan, Mexico

 

The Mexico City earthquake killed up to 35,000, injured more than 30,000 and left nearly 100,000 homeless. Severe damage with intensity up to IX - X in Mexico City and the surrounding area of about 1 million square km. Damage up to $5 billion U.S. Dollars. 412 building collapsed in Mexico City and more than 3000 additional structures were damaged.  Felt from Houston, Texas to Guatemala City, Guatemala. Landslides, sandblows and ground cracks were common as far away as Colima. A tsunami up to 3 meters high caused damage at Lazaro and Manzanillo. Seiche was observed in Texas, Mexico, Florida and as far away as Maryland and Idaho. Resonance effects were observed in damage to high rise buildings in Mexico City. Some of these swayed so much at the top that they hit each other causing extensive damage. This may be the most deadly earthquake recorded in North or Central America in recorded history." (September 19, 2022)

 

In the summary of September 18-19 and in previous issues this summary noted the potential of this storm on regional seismicity as:

 

 

"TS Lester formed today South of Oaxaca, Nexico  with winds up to 45 kts. It is expected to track to the northwest over the next several days reaching Guerrero and Michoacan, Mexico around September 18-20. It may provoke a moderate earthquake in that region on or shortly after landfall." (

 

"A second storm - Madeline is currently located south of Michoacan and Colima States in Mexico. While this storm is not expected to make landfall, the location near the landfall of Lester may enhance the possibility of related seismicity  in the area in the next several days. Madeline was address in this and the previous issue of this summary as:

 

"TS   MADELINE  2022-09-20  00:00 UT  17.3N  106.6W  050 kts  South of Colima, Mexico

 

TS Madeline formed today South of Colima, Nexico  with winds up to 50 kts. It is expected to track to the west and not to make landfall in Mexico. No major seismic enhancement in Mexico is expected with this storm." (September 19, 2022)

 

Moderate earthquakes of M 4.1 and M 3.4 today indicate areas where seismicity may be increasing with these tropical Storms. They had been expected to occur in mid-September in forecasts 146571, 146577 and 146578. This region is at the third node from the Taiwan earthquakes of September 18 of M 6.5 and 6.9 and from the M 7.0 in Luzon, Philippines of July 27, 2022 and may have been promoted by energy from those sources." (September 18-19, 2022)

 

Forecasts 146571 and 146570 had expected today's activity within about 150 km of this epicenter was likely in mid-September. This activity in Michoacan is located at 120.0 degrees (3rd node) from the M 6.9 in Taiwan of September 18 and was probably promoted by energy from that source. A smaller swarm in Chiapas Mexico today was also located at this distance from the M 7.6 in New Guinea of September 10, 2022.

 

O: 19SEP2022 23:00:06  18.0N  103.3W ML=4.0  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 20SEP2022 02:16:13  18.0N  103.3W ML=4.1  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 20SEP2022 02:23:41  18.0N  103.2W ML=4.1  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 20SEP2022 04:39:04  18.0N  103.4W ML=4.1  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 19SEP2022 22:57:06  18.1N  103.3W ML=4.2  EMSC   OFFSHORE MICHOACAN, MEXICO

O: 20SEP2022 00:09:03  18.2N  103.0W ML=4.1  EMSC   MICHOACAN, MEXICO

O: 20SEP2022 06:19:04  18.3N  103.3W mb=4.5  EMSC   MICHOACAN, MEXICO

O: 19SEP2022 18:05:08  18.4N  103.3W Mw=7.6  EMSC   MICHOACAN, MEXICO

O: 19SEP2022 19:30:41  18.5N  103.8W mb=5.3  EMSC   OFFSHORE MICHOACAN, MEXICO   

P: 13SEP2022 146571    19.0N  105.0W 3.5-5.3 CAAAA  Michoacan, Mexico          

P: 19SEP2022 146570    19.0N  101.0W 3.5-5.5 AABAA  Michoacan, Mexico          

 

Strong weather systems were also reported at the times of the events of September 19, 1917 and September 19, 1985 and may have helped promote those disastrous events. The system of September, 1985 for example, was subject to an internal report of the Nebraska Conservation Survey when  oil and gas production ceased several days before that event and resumed after it at higher levels than before as a strong weather front passed through both regions.  Relations to the earthquake of that date were analyzed in the report.

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 in Arizona. NEIC reported it was felt with intensity II-III in Arizona at Littlefield, Colorado City, in Utah at Saint George, Santa Clara, Washington, Ivins, Dammeron and Hurricane and in Mesquite, Nevada. The relation between earthquakes in this area of Arizona and earthquakes in Central America was examined in previous issues of this summary as one of the largest earthquakes in this area of Arizona occurred on February 4, 1976, the same day as the Guatemala City earthquake of M 7.5 which also killed tens of thousands. It was argued that these two regions may have a connection.

 

 2  4  0  4 58 1976  34.655 -112.500  12 5.2   SW U.S.A

 2  4  9  1 43 1976  15.324  -89.101   5 7.5   Guatemala

 

Similarly, one of the strongest earthquakes in Arizona in recent years occurred on September 2, 1992 hours after an M 7.4 in Nicaragua. This event was within  about 50 km of today's event in Nicaragua. Date for these two events follows:

 

 9  2  0 16  2 1992  11.742  -87.340  45 7.4   Nicaragua

 9  2 10 26 21 1992  37.090 -113.472  15 5.9   Utah   area

 

An M 4.5 north of this in Utah also followed an M 7.1 in Chile 7 hours earlier with the following parameters:

 

 1  3 12  6 36 2011  38.246 -112.340   5 4.7   Utah region

 1  2 20 20 18 2011  38.400  -73.200  15 7.1   Chile       

 

This earthquake of M 4.4 in Arizona is the strongest within about 100 km of this epicenter since the M 5.5-5.9 on September 2, 1992 (see above).

 

This event is located at 102 degrees from Taiwan and may have been promoted by the M 6.9 there of September 18. It is also near the antipode of the M 5.8 in the South Indian Ocean which occurred several hours earlier.

 

O: 19SEP2022 21:18:15  36.6N  113.4W mb=4.4  EMSC   ARIZONA                      

P: 19SEP2022 146604    37.8N  115.8W 2.5-4.6 ABBAA  California/Nevada area     

 

The moderate earthquake in Yellowstone National Park, Wyoming yesterday was followed by lightly felt events of M 2.3 and 2.9 today. Yesterday's summary  had noted the Yellowstone events as:

 

 

"An unusually large M 3.9 was widely felt in the Yellowstone National Park area of Montana and Wyoming. NEIC reported it was felt with intensity IV in Yellowstone National Park and II-III in West Yellowstone and II in Gardiner, Montana. Lesser shaking was reported from Billings, Montana and Buffalo, Wyoming and Sandy, Utah. Forecast 146703 had expected this event between September 14 and 20 was likely within about 25 km of this epicenter. This is the strongest earthquake in Yellowstone National Park, Wyoming since an M 4.4 on June 16, 2017 more than five years ago and before that an M 4.8 on March 30, 2014. This activity is at 103 degrees from the M 7.6 in New Guinea of September 10, 2022 and 101-103 degrees from the M 7.0 in Luzon of July 27, 2022 and may have been promoted by energy from those sources." (September 19, 2022)

 

O: 19SEP2022 23:39:54  44.8N  110.8W ML=2.3  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 20SEP2022 06:42:10  44.8N  110.8W Ml=2.9  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P: 14SEP2022 146703    44.6N  110.8W 2.0-4.1 BAAAA  Yellowstone/Wyoming        

P: 20SEP2022 146703    44.2N  110.3W 2.0-4.2 AAAAA  Yellowstone/Wyoming        

 

The second strongest earthquake in the world today was an M 5.8 in the mid-Indian Ridge of the South Indian Ocean. It was followed by an M 5.6 minutes before the M 7.6 in Michoacan, Mexico near the antipode of that event and may  have helped trigger that event by seismic waves. This activity occurred near local solar midnight and may have been promoted by strong tidal stresses which maximize near this hour. Forecast 146781 had expected this earthquake within about 50 km was likely around September 14, 2022. This epicenter is at the fifth node (72 degrees) from the M 6.9 in Taiwan of September 18 and was probably promoted by energy from that source. 

 

O: 19SEP2022 17:53:46  36.9S   78.6E Mw=5.6  EMSC   MID-INDIAN RIDGE

O: 19SEP2022 16:42:58  37.0S   78.4E Mw=5.8  EMSC   MID-INDIAN RIDGE             

P: 14SEP2022 146781    37.0S   79.0E 4.0-5.6 BAAAA  So. Indian Ocean           

 

An earthquake of M 4.5 also occurred off the coast of Portugal today. This is the strongest earthquake in this area within about 200 km since an M  4.7 on August 11, 2016 and an M 4.5 on June 5, 2012. The last event of significantly larger magnitude in this area was an M 5.6 on December 17, 2009. This summary reported on this event at the time as:

 

"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.  The only earthquake in the past 20 years of similar or larger magnitude in this region occurred on February 12, 2007 with M 5.9 about 100 km to the southwest of today's epicenter." (December 17, 2017)

 

Forecast 146622 had expected this event was likely within about 100 km around September 16, 2022. This earthquake is located at 144 degrees from the M 7.6 in New Guinea of September 10 and was likely promoted by energy from that source. A similar event of M 4.7 in the Central Atlantic Azores is at this same distance from New Guinea. It had been expected in forecast 146683 within  about 50 km in mid-September. This event is located at 104 degrees from Taiwan and may have been promoted by the M 6.9 there of September 18.

 

O: 19SEP2022 16:30:47  36.6N   11.1W mb=4.5  EMSC   AZORES-CAPE ST. VINCENT RIDGE

P: 16SEP2022 146622    37.0N   10.0W 3.5-4.9 BAAAA  Morocco/Spain              

 

O: 19SEP2022 07:18:38  40.9N   29.3W mb=4.7  EMSC   AZORES ISLANDS REGION        

P: 12SEP2022 146683    41.0N   30.0W 4.0-5.4 CAAAA  No. Mid-Atlantic Ridge     

 

An unusual M 4.6 in the South Georgia Islands was also located at 144 degrees from the M 6.9 in Taiwan of September 18. This is the strongest earthquake within about 250 km of this epicenter since an M 5.4 on September 16, 2021, a year ago.

 

O: 19SEP2022 11:13:22  55.2S   35.9W mb=4.6  EMSC   SOUTH GEORGIA ISLAND REGION  

P: 14SEP2022 146790    60.0S   29.0W 4.0-6.0 BCCAA  So. Sandwich Islands       

 

TROPICAL OCEANIC STORMS LIKELY TO ENHANCE REGIONAL SEISMCITY

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 18, 2022

 

 

Moderately strong aftershocks continued in Taiwan today following the M 6.5 and 6.9 there yesterday. Earthquakes of M 5.5 and 5.7 in Taiwan today were reported by NEIC to have been felt with intensity III-IV in Chiayi, Changhua, Tainan, Taipei, Taoyuan Counties, Taiwan. Current tolls in the major earthquakes were updated to one killed and nine injured in the quakes. At least 20 moderate aftershocks were recorded today. The strongest were M 5.5 and 5.7 and 5.2.  Some far-field seismic enhancement is expected from the M 6.9 in Taiwan. Areas subject to far-field seismic triggering from Taiwan include:

 

Antipodal (~180 degrees) : Taiwan to northern Chile,

Outer shadow zone edge (141-148 degrees) : Taiwan to Panama, Colombia, Southern Atlantic, South Sandwich Islands,

Node 3 (120 degrees) : Taiwan to Western Mexico, 

P- and S- shadow zone edge and node 7 (101-110 degrees) : Taiwan to Southern California,  Yellowstone National Park,

Node 4 (90 degrees) : Taiwan to Coast of Northern California, Washington,

Node 5 (72 degrees) : Taiwan to Southern, Central Alaska, Fiji, Tonga,

Node 6 (60 degrees) : Taiwan to Andreanof Islands, Alaska, Santa Cruz Islands, 

Node 7 (52 degrees) : Taiwan to Pakistan,

 

Forecast 146597 had expected this activity in Taiwan was likely around September 20, 2022.

 

O: 18SEP2022 07:27:26  23.1N  121.2E ML=4.1  EMSC   TAIWAN

O: 18SEP2022 07:44:17  23.1N  121.2E ML=4.1  EMSC   TAIWAN

O: 18SEP2022 07:46:38  23.1N  121.2E ML=4.0  EMSC   TAIWAN

O: 18SEP2022 08:46:32  23.1N  121.2E Mw=5.2  EMSC   TAIWAN

O: 18SEP2022 11:27:31  23.1N  121.2E ML=4.2  EMSC   TAIWAN

O: 18SEP2022 12:44:36  23.1N  121.2E ML=4.2  EMSC   TAIWAN

O: 18SEP2022 18:21:10  23.1N  121.2E ML=4.4  EMSC   TAIWAN

O: 18SEP2022 18:41:48  23.1N  121.2E ML=4.1  EMSC   TAIWAN

O: 18SEP2022 08:30:41  23.2N  121.4E mb=4.2  EMSC   TAIWAN

O: 18SEP2022 09:15:06  23.2N  121.4E ML=4.5  EMSC   TAIWAN

O: 18SEP2022 09:39:58  23.2N  121.4E Mw=5.7  EMSC   TAIWAN

O: 18SEP2022 09:46:32  23.2N  121.3E ML=4.8  EMSC   TAIWAN

O: 18SEP2022 12:11:05  23.2N  121.2E ML=4.1  EMSC   TAIWAN

O: 18SEP2022 09:20:11  23.3N  121.2E ML=4.4  EMSC   TAIWAN

O: 18SEP2022 10:39:54  23.3N  121.3E ML=4.3  EMSC   TAIWAN

O: 18SEP2022 08:34:06  23.4N  121.4E ML=4.3  EMSC   TAIWAN

O: 18SEP2022 10:57:08  23.4N  121.3E ML=4.2  EMSC   TAIWAN

O: 18SEP2022 12:33:35  23.4N  121.4E ML=4.4  EMSC   TAIWAN

O: 19SEP2022 02:07:44  23.4N  121.4E Mw=5.5  EMSC   TAIWAN

O: 18SEP2022 07:00:17  23.5N  121.3E ML=4.1  EMSC   TAIWAN

O: 18SEP2022 07:05:18  23.5N  121.3E ML=4.0  EMSC   TAIWAN

O: 18SEP2022 07:20:19  23.1N  121.2E ML=4.0  EMSC   TAIWAN                       

P: 20SEP2022 146597    23.0N  121.0E 4.0-5.5 AAAAA  Taiwan                     

 

The strongest earthquake in the world today was an M 5.7 earthquake in central Ryukyu Islands, Japan. This region became active on September 17, 2022 following the M 6.5 in Taiwan of that date. At the time this summary noted:

 

 

"A series of moderate earthquakes also followed the M 6.4 in Taiwan today in the Ryukyu Islands of Japan. These are located about 500 km northeast of the Taiwan mainshocks but were probably promoted by stress redistribution. Forecast 146594 had expected this activity in the Ryukyu Islands was likely around September 20 within about 50-100 km of these epicenters." (September 18, 2022)

 

The last earthquake in the Ryukyu Islands within about 200 km of this epicenter occurred  on December 26, 2021 with M 5.9. The last earthquake of significantly larger magnitude in this area of the Ryukyu Islands was an M 6.5 on March 2, 2014 more than eight years ago.  Typhoon Merbok passed over these epicenters several days ago and likely helped promote today's activity. Forecast 146594 had expected today's activity in this area was most likely around September 20.

 

O: 18SEP2022 10:05:38  26.3N  126.1E mb=5.0  EMSC   RYUKYU ISLANDS, JAPAN

O: 18SEP2022 08:07:28  26.4N  126.0E mb=5.2  EMSC   RYUKYU ISLANDS, JAPAN

O: 18SEP2022 08:24:30  26.5N  125.8E ML=4.8  EMSC   NORTHEAST OF TAIWAN

O: 18SEP2022 08:10:00  26.3N  126.0E Mw=5.7  EMSC   RYUKYU ISLANDS, JAPAN        

P: 20SEP2022 146594    27.0N  125.0E 4.0-5.4 AAAAA  Ryukyu Islands              

 

An unusual earthquake of M 4,6 was recorded today off the coast of Oman south of Iran. It was the first earthquake of M>=4.6 near Oman within about 300 km of this epicenter since an M 4.7 on April 23, 2019. The last and largest in the past 30 years in the region was an M 5.5 on October 31, 2016. At the time of that earthquake this summary noted in this regard:

 

"The strongest earthquake of the day was an M 5.5 in the Owen Fracture Zone south of Iran. This is a remote area and this event was not reported felt or damaging in the region. This is an unusual earthquake. The last earthquake of M>=5.5 within about 250 km of this epicenter occurred more than 25 years ago. This is the strongest earthquake in the area since an M 5.6 on April 7, 1985. Similar events of M 5.5 occurred in 1966, 1963 and 1935. No earthquakes of M>5.5 have ever been recorded in this region." (November 1, 2016)

 

O: 19SEP2022 04:26:52  21.1N   59.6E mb=4.6  EMSC   NEAR THE COAST OF OMAN       

 

An M 5.6 also occurred today in the region of the Santa Cruz Islands in the South Pacific today. The last earthquake in the Santa Cruz Islands within about 250 km of this epicenter with M>=5.6 was an M 5.7 on January 26, 2019.  Forecast 146754 had expected a moderate quake in this area around September 19.

 

O: 18SEP2022 09:41:46  10.7S  164.2E mb=5.6  EMSC   SANTA CRUZ ISLANDS REGION    

P: 19SEP2022 146754    12.0S  167.0E 4.0-5.6 ABCAA  Vanuatu Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 4.8 in Central Alaska. NEIC reported it was felt with intensity IV in Alaska at Clear, Nenana, Fairbanks and III in Anderson, Fort Wainwright, North Pole, Healy and Manley Hot Springs. This earthquake of M 4.8 is the strongest event within about 200 km of this epicenter since an M 4.9 about 200 km southwest of this on September 14, 2021 and an M 4.9 on October 23, 2014. An event of  5.5 on April 8, 2021 occurred about 200 km southeast of this on April 8, 2021, the largest within about 200 km of this epicenter in the past 10 years. Forecast 146733 had expected this earthquake was likely in this area around September 18.

 

O: 19SEP2022 01:15:29  64.8N  149.2W Mw=4.5  EMSC   CENTRAL ALASKA               

O: 19SEP2022 01:15:29  64.8N  149.2W Mw=4.8  ANSS   CENTRAL ALASKA               

P: 18SEP2022 146733    63.3N  147.5W 3.2-5.2 ABAAA  Central Alaska             

 

An unusually large M 3.9 was widely felt in the Yellowstone National Park area of Montana and Wyoming. NEIC reported it was felt with intensity IV in Yellowstone National Park and II-III in West Yellowstone and II in Gardiner, Montana. Lesser shaking was reported from Billings, Montana and Buffalo, Wyoming and Sandy, Utah. Forecast 146703 had expected this event between September 14 and 20 was likely within about 25 km of this epicenter. This is the strongest earthquake in  Yellowstone National Park, Wyoming since an M 4.4 on June 16, 2017 more than five years ago and before that an M 4.8 on March 30, 2014. This activity is at 103 degrees from the M 7.6 in New Guinea of September 10, 2022 and 101-103 degrees from the M 7.0 in Luzon of July 27, 2022 and may have been promoted  by energy from those sources.

 

O: 18SEP2022 12:55:20  44.8N  110.8W mb=3.9  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P: 14SEP2022 146703    44.6N  110.8W 2.0-4.1 AAAAA  Yellowstone/Wyoming        

P: 20SEP2022 146703    44.2N  110.3W 2.0-4.2 AAAAA  Yellowstone/Wyoming        

 

Hurricane Fiona continued today as a strong storm over Puerto Rico where it caused major flooding, landslide and mudslides, damaged structures and caused a power loss over the entire island. This arrived from the south and the loading effect is less than if it had arrived from the north. However as this storm moves over Puerto Rico, the Dominican Republic and Haiti, regional seismicity is expected to be enhanced in the next several days. This summary had noted in previous issues in regard to this storm:

 

 

"TS Fiona continued today over Puerto Rico with winds up to 85 kts. Major flooding and complete power outage occurred on Puerto Rico today. It is expected to track to the west over the next several days reaching Puerto Rico in the next two  days as a major storm. It could help promoted enhanced seismicity in the Virgin Islands, Leeward Islands and Puerto Rico around September 18-19." (September 18-19, 2022)

 

It was a quiet day in Puerto Rico and Hispaniola today but this may change as Hurricane Fiona moves to the north. The largest event in the area today was an M 3.1 in the Dominican Republic forecast in #146581.

 

O: 19SEP2022 06:45:05  19.6N   70.0W ML=3.1  EMSC   DOMINICAN REPUBLIC           

P: 17SEP2022 146581    19.0N   71.0W 3.4-5.3 AAAAA  Puerto Rico                

 

Another area where seismicity is likely to be impacted by a tropical storm in the next several days is central and western coastal Mexico where two tropical storms are near or at landfall at this time. Tropical Storm Lester dissipated over the region of Guerrero and Michoacan Mexico today. This is the first storm of the season to make landfall in Mexico. First landfalls often trigger unusually large earthquakes in seismically active areas such as Michoacan. Twenty-seven years ago today, this area suffered from one of the strongest great earthquakes in region of Central and North America occurred as noted in the earthquake summary yesterday:

 

" 9 19 13 17 47 1985  18.190 -102.533  28 8.1   Michoacan, Mexico

 

The Mexico City earthquake killed up to 35,000, injured more than 30,000 and left nearly 100,000 homeless. Severe damage with intensity up to IX - X in Mexico City and the surrounding area of about 1 million square km. Damage up to $5 billion U.S. Dollars. 412 building collapsed in Mexico City and more than 3000 additional structures were damaged.  Felt from Houston, Texas to Guatemala City, Guatemala. Landslides, sandblows and ground cracks were common as far away as Colima. A tsunami up to 3 meters high caused damage at Lazaro and Manzanillo. Seiche was observed in Texas, Mexico, Florida and as far away as Maryland and Idaho. Resonance effects were observed in damage to high rise buildings in Mexico City. Some of these swayed so much at the top that they hit each other causing extensive damage. This may be the most deadly earthquake recorded in North or Central America in recorded history." (September 19, 2022)

 

In the summary of September 18-19 and in previous issues this summary noted the potential of this storm on regional seismicity as:

 

 

"TS Lester formed today South of Oaxaca, Nexico  with winds up to 45 kts. It is expected to track to the northwest over the next several days reaching Guerrero and Michoacan, Mexico around September 18-20. It may provoke a moderate earthquake in that region on or shortly after landfall." (

 

A second storm - Madeline is currently located south of Michoacan and Colima States in Mexico. While this storm is not expected to make landfall, the location near the landfall of Lester may enhance the possibility of related seismicity  in the area in the next several days. Madeline was address in this and the previous issue of this summary as:

 

"TS   MADELINE  2022-09-20  00:00 UT  17.3N  106.6W  050 kts  South of Colima, Mexico

TS Madeline formed today South of Colima, Nexico  with winds up to 50 kts. It is expected to track to the west and not to make landfall in Mexico. No major seismic enhancement in Mexico is expected with this storm." (September 19, 2022)

 

Moderate earthquakes of M 4.1 and M 3.4 today indicate areas where seismicity may be increasing with these tropical Storms. They had been expected to occur in mid-September in forecasts 146571, 146577 and 146578. This region is at the third node from the Taiwan earthquakes of September 18 of M 6.5 and 6.9 and from the M 7.0 in Luzon, Philippines of July 27, 2022 and may have been promoted by energy from those sources.

 

O: 18SEP2022 23:47:16  15.7N   97.3W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO

O: 18SEP2022 07:53:18  15.9N   98.4W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO

O: 19SEP2022 02:09:26  17.7N   96.9W ML=4.0  EMSC   OAXACA, MEXICO

O: 18SEP2022 09:58:44  16.2N   97.5W ML=4.1  EMSC   OAXACA, MEXICO               

P: 18SEP2022 146577    16.0N   96.0W 3.5-5.1 AABAA  Oaxaca, Mexico             

P: 18SEP2022 146578    16.0N   99.0W 3.5-5.2 AABAA  Oaxaca, Mexico             

 

 

O: 18SEP2022 20:23:43  19.4N  104.2W ML=3.5  EMSC   JALISCO, MEXICO

O: 18SEP2022 09:38:13  19.5N  104.7W ML=3.4  EMSC   JALISCO, MEXICO

P: 13SEP2022 146571    19.0N  105.0W 3.5-5.3 AAAAA  Michoacan, Mexico          

 

STRONG EARTHQUAKES DAMAGING IN TAIWAN PROBABLY TRIGGERED BY SOLAR FLARE

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 17, 2022

 

 

A pair of strong to major earthquakes hit the region of Central Taiwan today. These events of M 6.4-6.6 and M 6.9-7.2 were reported with maximum intensity IV in Taitung by NEIC with moderate shaking throughout the remainder of the island. The second event was generally felt with higher intensity by one from the first event in the series. A strong series of aftershocks including an M 5.5 was also felt throughout Taiwan. The first of these - the M 6.5 occurred in conjunction with flare 2380 - an M1.9 flare and the strongest flare in the past day and was probably triggered by SFE from this event. It occurred near local solar midnight, a time when SFE are prominent in triggering local seismicity. The relation between solar flares and seismicity in Taiwan had most recently been illuminated in the previous issue of this summary as:

 

"An M6.2 solar flare occurred while Taiwan was at local solar midnight and may tend to further enhance seismicity in that region, recently stressed by Typhoon Muifa." (September 17, 2022)

 

An M 4.7 in Tarapaca, Chile followed the M 6.5 in Taiwan by a minute. It too may have been triggered an the solar flare peaking at 13:39 UT.

 

This activity had been anticipated in previous issues of this summary as a reaction to the passage of Typhoon Muifa over Taiwan several days ago. This was detailed in the previous issue of this summary as:

 

 

"Other areas still susceptible to the stresses wrought on the area by Muifa where a  moderate to large earthquake could still occur are Taiwan and the Ryukyu Islands.

 

"Typhoon Muifa (14W) continued today over eastern China with winds up to 55 kts. It is expected to track to the northwest over the next several days and may help promote seismicity in the  region of Taiwan, China and the Ryukyu Islands in the next several days." (September 14-16, 2022)

 

"Typhoon Muifa (14W) continued today over Taiwan with winds up to 110 kts. It is expected to track to the northwest over the next several days and may help promote seismicity in the  region of Taiwan and the Ryukyu Islands in the next several days." (September 14, 2022)

 

These earthquakes triggered tsunami warnings from Taiwan to Japan, but no major tsunami was reported. At least one building collapsed - a convenience shop - in the quakes but no deaths were reported. This may change following rescue efforts. At leas 600 people were trapped on Mountain Roads. Six train carriages were derailed in Dongli Station in eastern Taiwan and train service was shut down.  CWB reported the M 6.4 was felt with intensity VI in Taitung, V in Hualien and Kaohsiung, IV in Chiayi, Pingtung, Nantou, Yunlin, Chiayi, III in Maoli, Hsinchu, Yilan, Taichung, Changhua, Taipei, and II in Penghu Counties, Taiwan. CWB reported the M 6.9 was felt with intensity VI in Taitung and Hualien, V in Nantou, Kaohsiung, IV in Yilan, Taichung, Changhua, Yunlin, Taipei,  Chiayi, Mialoi, Tainan, Hsinchu, Pingtung and III in Taoyuan, Penghu and I in Lienchiang Counties, Taiwan. Manufacturing facilities in Tawain were reportedly unaffected by these earthquakes. The last earthquake in Taiwan of M>=6.9 was an M 6.9 on December 26, 2006. An M 7.7 near today's epicenter occurred on September 20, 1999 - 23 years ago. The only other such event in Taiwan in the past 30 years was an M 7.1 on March 31, 2002. A moderate foreshock of M 5.3 hit this area of Taiwan on September 14.

 

"A series of moderate earthquakes hit the region of Taiwan and to the north today. This included an M 4.9-5.3 in southern Taiwan and events of M 4.4, 4.4 and 4.9 northeast of Taiwan near the Ryukyu Islands. CWB reported the M 5.3 in Taiwan was felt with intensity IV in Taitung, II in Pingtung, Tainan, Chiayi, Yunlin, Kaohsiung, Hualien and I in Nantou and Changhua Counties, Taiwan. NEIC reported this earthquake of M 4.9 in Southern Taiwan was felt with intensity II-III in the area(s) of Southern Taiwan in Kaohsiung County. The last event in Taiwan reported with M>=5.3 was an M 5.4 on June 28, 2022. The last of significantly larger magnitude was an M 5.9 on June 20, 2022. These are probably aftershocks of the M 6.7 north of today's epicenter on March 22, 2022. This activity follows the passage of Typhoon Muifa over Taiwan and the  epicenters to the north over the past three days. ...

 

Typhoon Muifa passed over the epicenters northeast of Taiwan on September 13 about the time these three earthquakes occurred. It is likely that stresses from this storm probably helped trigger these events. The M 4.9 occurred within minutes of local solar midnight and was also probably promoted by high tidal stresses which maximize near this hour." (September 14-15, 2022)

 

The M 6.4 was coincident with the peak of an  M1.9 flare (#2380) as shown by data from SWPC below:

 

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

#-------------------------------------------------------------------------------

 

2380       1321   1339      1353   M1.9      (September 18, 2022)   3.1E-02  

2450       2032   2041      2052   M2.6      (September 18, 2022)   2.1E-02  

 

Today's earthquake in Taiwan may also have been promoted by the M 7.0 about 500 km to the south in northern Philippines of July 27 by redistribution of regional stress. Forecast 146597 had expected today's activity in Taiwan was likely in mid-September within about 100 km of these epicenters.

 

 

O: 18SEP2022 06:57:33  23.0N  121.3E mb=5.1  EMSC   TAIWAN REGION

O: 17SEP2022 13:55:43  23.1N  121.2E mb=4.9  EMSC   TAIWAN

O: 17SEP2022 14:12:51  23.1N  121.2E ML=4.1  EMSC   TAIWAN

O: 17SEP2022 14:35:15  23.1N  121.2E Mw=5.1  EMSC   TAIWAN

O: 17SEP2022 14:45:29  23.1N  121.3E Mw=5.5  EMSC   TAIWAN

O: 17SEP2022 15:00:11  23.1N  121.2E mb=4.7  EMSC   TAIWAN

O: 17SEP2022 15:03:19  23.1N  121.2E ML=4.2  EMSC   TAIWAN

O: 17SEP2022 15:24:34  23.1N  121.2E ML=4.0  EMSC   TAIWAN

O: 17SEP2022 15:33:06  23.1N  121.2E ML=4.3  EMSC   TAIWAN

O: 17SEP2022 16:18:47  23.1N  121.2E ML=4.1  EMSC   TAIWAN

O: 17SEP2022 18:03:29  23.1N  121.4E Mw=4.6  EMSC   TAIWAN

O: 17SEP2022 21:41:43  23.1N  121.3E ML=4.1  EMSC   TAIWAN

O: 17SEP2022 22:05:52  23.1N  121.2E ML=4.3  EMSC   TAIWAN

O: 18SEP2022 01:52:34  23.1N  121.3E mb=4.7  EMSC   TAIWAN

O: 18SEP2022 02:00:08  23.1N  121.4E mb=4.6  EMSC   TAIWAN

O: 18SEP2022 03:49:21  23.1N  121.3E ML=4.5  EMSC   TAIWAN

O: 18SEP2022 04:07:41  23.1N  121.3E mb=4.1  EMSC   TAIWAN

O: 18SEP2022 05:54:40  23.1N  121.3E mb=4.5  EMSC   TAIWAN

O: 18SEP2022 06:48:48  23.1N  121.2E ML=4.0  EMSC   TAIWAN

O: 17SEP2022 13:41:19  23.2N  121.4E Mw=6.5  EMSC   TAIWAN

O: 18SEP2022 05:19:19  23.2N  121.3E mb=5.5  EMSC   TAIWAN

O: 18SEP2022 06:32:02  23.2N  121.4E Mw=5.2  EMSC   TAIWAN

O: 18SEP2022 06:33:25  23.2N  121.3E ML=4.0  EMSC   TAIWAN

O: 18SEP2022 06:44:17  23.2N  121.4E Mw=6.9  EMSC   TAIWAN

O: 18SEP2022 07:00:17  23.5N  121.3E ML=4.1  EMSC   TAIWAN

O: 18SEP2022 07:05:18  23.5N  121.3E ML=4.0  EMSC   TAIWAN

O: 17SEP2022 19:25:56  24.0N  122.8E mb=4.4  EMSC   TAIWAN REGION

O: 18SEP2022 04:10:52  22.7N  121.1E mb=4.4  EMSC   TAIWAN REGION                 

O: 18SEP2022 06:44:15  23.1N  121.2E ML=6.8  TAI    Hualien, Taiwan              

O: 17SEP2022 13:41:19  23.1N  121.2E ML=6.4  TAI    Hualien, Taiwan              

P: 20SEP2022 146597    23.0N  121.0E 4.0-5.5 AAAAA  Taiwan                     

P: 15SEP2022 146597    24.0N  121.0E 4.0-5.4 AAAAA  Taiwan                     

 

A series of moderate earthquakes also followed the M 6.4 in Taiwan today in the Ryukyu Islands of Japan. These are located about 500 km northeast of the Taiwan mainshocks but were probably promoted by stress redistribution.

Forecast 146594 had expected this activity in the Ryukyu Islands was likely around September 20 within about 50-100 km of these epicenters.

 

O: 17SEP2022 18:25:31  26.2N  125.9E mb=4.4  EMSC   NORTHEAST OF TAIWAN

O: 18SEP2022 06:04:42  26.4N  126.1E mb=4.5  EMSC   RYUKYU ISLANDS, JAPAN

O: 17SEP2022 10:29:30  26.5N  126.0E ML=4.8  EMSC   RYUKYU ISLANDS, JAPAN

O: 18SEP2022 05:59:53  26.4N  126.0E mb=4.9  EMSC   NORTHEAST OF TAIWAN          

P: 20SEP2022 146594    27.0N  125.0E 4.0-5.4 AAAAA  Ryukyu Islands             

 

O: 18SEP2022 02:56:10  24.9N  123.3E mb=4.3  EMSC   SOUTHWESTERN RYUKYU ISL., JAPA

P: 20SEP2022 146594    25.0N  123.0E 4.0-5.4 AAAAA  Ryukyu Islands             

 

 

The strongest earthquakes in the U.S. or Canada were a series throughout the region of M 3.4-3.7. The largest of these, an M 3.7 in Southern Alaska occurred within minutes of local solar noon and was probably promoted by tidal  stresses. Another in the Gulf of Alaska of M 3.4 followed the M 6.4 in Taiwan two minutes later and was probably promoted by flare 2380 as was the activity in Taiwan (see discussion above). Forecasts had expected all of these within about 100 km in mid-September.

 

O: 17SEP2022 21:28:21  51.7N  178.1W ml=3.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 14SEP2022 146705    51.0N  177.1W 3.5-5.2 BAAAA  Andreanoff Isls, Aleutians 

 

O: 17SEP2022 09:09:41  55.7N  154.9W ML=3.5  EMSC   SOUTH OF ALASKA              

P: 14SEP2022 146704    56.8N  157.7W 3.5-4.9 BBBAA  Alaska Peninsula           

 

O: 17SEP2022 13:43:25  56.3N  149.3W ML=3.4  EMSC   GULF OF ALASKA               

P: 15SEP2022 146736    55.9N  149.8W 3.0-5.2 AAAAA  Northern Alaska            

 

O: 17SEP2022 22:08:34  59.6N  153.0W ML=3.7  EMSC   SOUTHERN ALASKA              

P: 14SEP2022 146729    60.0N  153.5W 3.2-5.3 BAAAA  Central Alaska             

 

Like the earthquakes in Taiwan and the Gulf of Alaska, the strongest earthquake in the western Hemisphere today also coincided with the peak of Flare 2380 and within a minute of the event in the Gulf of Alaska and the M 6.4-6.5 in Taiwan.

This was an M 5.1 in the Tarapaca area of northern Chile. GUC reported this earthquake was felt with intensity  IV in  Tarapaca at El Loa, Huara, Iquique, III in Camina, La Tirana, Pica, Pozo Almonte and in Arica with III in Arica, Cuya and II in San Miguel de Azapa, Chile. NEIC reported these earthquakes of M 5.1 and 4.2 in Northern Chile were felt with intensity II-III in the area(s) of Northern Chile in Iquique (IV), and Arica, Tarapaca. Forecast 146760 had expected this event was likely about 200 km south of the epicenter around September 15. This epicenter is near the antipode from Taiwan.

 

O: 17SEP2022 15:05:02  20.2S   69.2W ML=4.2  EMSC   TARAPACA, CHILE

O: 17SEP2022 13:42:40  20.2S   69.3W Mw=4.7  EMSC   TARAPACA, CHILE

O: 17SEP2022 13:42     20.2S   69.2W mb=4.7  GUC    Tarapaca at El Loa, Huara, Iqu

O: 17SEP2022 13:42     20.2S   69.2W mb=5.1  ANSS   Tarapaca at El Loa, Huara, Iqu

P: 15SEP2022 146760    22.0S   69.0W 4.0-5.6 AAAAA  Coast No. Chile            

 

 

Some of the strongest activity today the U.S. outside Alaska occurred off the coast of Northern California. These events of M 2.8-3.3 and 2.4 may have been promoted by strong tidal stresses as they occurred within minutes of  local solar noon. They may also have been triggered by flare #2450 (see flare data from SWPC above and in the external effects section of this summary), the other M-class flare today which was simultaneous with these earthquakes in Northern California. This activity had been expected within about 25 km of these epicenters around September 15.

 

NEIC reported this earthquake of M 3.4 off the coast of northern California  was felt with intensity II-III in the area(s) of northern California in Petrolia (IV), Ferndale, Rio Dell, Fortuna, Loleta, Carlotta and Eureka.  This activity is located at the fourth node from Taiwan (90 degrees) and was probably promoted by energy from that source. Forecast 146686 had expected the events off northern California were likely within about 25 km around September 15.

 

O: 17SEP2022 20:31:58  40.4N  124.6W ML=2.4  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 17SEP2022 20:44:16  40.4N  124.5W ML=2.8  EMSC   OFFSHORE NORTHERN CALIFORNIA 

O: 17SEP2022 20:44:16  40.4N  124.5W ML=3.4  ANSS   OFFSHORE NORTHERN CALIFORNIA 

P: 15SEP2022 146686    40.2N  124.2W 2.5-4.8 AAAAA  Off Coast of No. Calif     

 

A series of earthquake in Southern California near Midpines also occurred today and contained the largest earthquake in the lower 48 states of the day. This activity occurred at 102 degrees from Taiwan and was probably promoted by energy from that source. The M 3.5 shock occurred within about 30 minutes of local solar midnight and may have also been promoted by strong tidal stresses which maximize near this hour.

 

O: 17SEP2022 09:10:20  31.5N  115.7W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO

O: 17SEP2022 09:30:29  31.2N  115.7W ML=3.1  EMSC   BAJA CALIFORNIA, MEXICO      

O: 18SEP2022 06:29:32  32.9N  115.6W Ml=2.2  EMSC   SOUTHERN CALIFORNIA          

O: 18SEP2022 04:43:30  33.7N  115.9W ML=2.7  EMSC   SOUTHERN CALIFORNIA

O: 18SEP2022 05:04:41  33.8N  115.9W ML=2.6  EMSC   SOUTHERN CALIFORNIA

O: 18SEP2022 05:18:55  33.8N  115.9W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 18SEP2022 05:30:05  33.8N  115.9W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 18SEP2022 06:55:47  33.8N  115.9W ML=3.3  EMSC   SOUTHERN CALIFORNIA

O: 18SEP2022 06:55:47  33.8N  115.9W ML=3.5  ANSS   SOUTHERN CALIFORNIA

P: 13SEP2022 146640    32.9N  115.6W 2.5-4.4 BAAAA  So. California             

 

MODERATE QUAKES IN LOYALTY, KERMADEC ISLANDS

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 16, 2022

 

The strongest seismicity in the world today continued near the geomagnetic equator in the South Pacific where events of M 5.7 and 5.6 hit the Kermadec Islands and the Loyalty Islands. These events were not reported felt in these remote regions

and are aftershocks of recent larger quakes in the area. Those in the Loyalty Islands follow an M 7.0 two days ago. Other significant activity occurred in  conjunction with major ocean storms. Typhoon Merbok made landfall in Alaska today with considerable wind damage and flooding. This was accompanied by an M 4.7 at the antipode south of Africa and by an M 3.9 in southern Alaska. Typhoon Muifa also continued to promote regional seismicity in China, Taiwan and southern Ryukyu Islands and may continue to be seismo-effective for another day or two in this area.

 

The M 5.7 in the central Kermadec Islands of New Zealand is the strongest within about 200 km of that epicenter since an M 5.7 on August 5, 2022.  At the time this summary noted in this regard:

 

"The strongest of these events was an M 5.7 in the central Kermadec Islands. This event was not reported felt in this remote area. It is the strongest in the Central Kermadec Islands within about 200 km of this epicenter since an

M 5.8 on March 20, 2022. ... likely aftershocks of an M 6.6 of March 2, 2022." (August 5, 2022)

 

 

Today's event occurred within minutes of local solar noon and was probably promoted by high tidal stresses which maximize at this time.  Forecast 146782 had expected today's activity within about 100 km was likely within about 100 km around September 17.

 

O: 17SEP2022 00:06:55  30.2S  177.8W Mw=5.7  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 17SEP2022 146782    31.0S  177.0W 4.0-5.4 AAAAA  So. Kermadec Islands       

 

The M 5.6 in the Loyalty Islands today is the first significant aftershock activity in the area following the M 7.0 of September 14. It occurred within minutes of local solar noon and may have been promoted by high tidal stresses which maximize near this hour. Like the event in the Kermadec Islands, this earthquake of M 5.6 occurred within minutes of local solar noon and was probably promoted by strong tidal stresses. Forecast 146761 had expected this event within about 100 km

was likely around September 16.

 

O: 16SEP2022 23:58:19  22.2S  171.0E Mw=5.6  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

O: 17SEP2022 02:59:15  22.8S  172.8E mb=4.5  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 16SEP2022 146761    23.0S  172.0E 4.0-5.4 AAAAA  Loyalty Islands            

 

Moderate earthquakes occurred in north-eastern China today with M 3.9 and 4.4 in the region of Xinjiang. This summary had suggested that enhanced seismicity was likely in this area at this time with the landfall of Typhoon Muifa as noted in previous issues:

 

"Typhoon Muifa (14W) continued today over eastern China with winds up to 35 kts. Extensive flooding and damage occurred as Muifa passed over the heavily populated eastern coast of China today. It is expected to track to the northwest over the next several days and may help promote seismicity in the  region of eastern China in the next several days." (September 16-17, 2022)

 

Other areas still susceptible to the stresses wrought on the area by Muifa where a  moderate to large earthquake could still occur are Taiwan and the Ryukyu Islands.

 

"Typhoon Muifa (14W) continued today over eastern China with winds up to 55 kts. It is expected to track to the northwest over the next several days and may help promote seismicity in the  region of Taiwan, China and the Ryukyu Islands in the next several days." (September 14-16, 2022)

 

"Typhoon Muifa (14W) continued today over Taiwan with winds up to 110 kts. It is expected to track to the northwest over the next several days and may help promote seismicity in the  region of Taiwan and the Ryukyu Islands in the next several days." (September 14, 2022)

 

The last earthquake of equal or greater magnitude then M 4.2 within about 250 km of today's event in Northern Xinjiang, China occurred with M 4.4 on January 4, 2021. Forecast 146415 had expected this activity in Xinjiang was likely in early

to mid-September within about 100 km of this epicenter. This activity is located at 103 degrees from the M 7.0 in the Loyalty Islands of September 14  and at 101 degrees from the M 6.9 in the central Atlantic of September 4, 2022 and may have been promoted by energy from those sources. An M6.2 solar flare occurred while Taiwan was at local solar midnight and may tend to further enhance seismicity in that region, recently stressed by Typhoon Muifa.

 

O: 17SEP2022 04:22:29  42.5N   81.2E mb=4.4  EMSC   NORTHERN XINJIANG, CHINA

O: 16SEP2022 09:38:24  42.4N   81.1E mb=3.8  EMSC   NORTHERN XINJIANG, CHINA     

P:  7SEP2022 146415    42.0N   82.0E 4.0-5.4 CAAAA  Kirgizstan/Xinjiang        

 

The strongest earthquake in the U.S. or Canada today was an M 3.9 in Southern Alaska. Today's event was associated with a very strong tropical cyclone as noted in the previous issue of this summary:

 

"This summary had expected elevated seismicity in this region was likely at this time as Typhoon

Merbok was approaching the area. This is the strongest typhoon to impact

the Aleutians in nearly a decade." (September 16, 2022)

 

 

"Typhoon Merbok (TD 15W) continued today in the North Pacific Ocean with winds up to 80 kts. It is expected to track to the northeast over the next several days reaching the Aleutians around September 16 as a typhoon. A moderate to strong earthquake is possible in the central Aleutians as this storm passes through." (September 14-15, 2022)

 

and

 

"Typhoon Merbok (TD 15W) continued today in the North Pacific Ocean with winds up to 80 kts. It is expected to track to the northeast over the next several days reaching the Aleutians around September 18 as a typhoon. This is one of the strongest tropical storms to threaten the Aleutians in the last decade. A moderate to strong earthquake is possible in the central Aleutians as this storm passes through." (September 15-16, 2022)

 

Forecast 146729 had expected today's event within about 40 km was likely around September 14.

 

O: 17SEP2022 02:44:13  59.7N  153.2W ML=3.9  EMSC   SOUTHERN ALASKA              

P: 14SEP2022 146729    60.0N  153.5W 3.2-5.3 BAAAA  Central Alaska             

 

An M 5.2 near the antipode of this event in Southern Alaska occurred about three hours later in the region South of Africa. It may have been promoted by antipodal focusing of surface energy following the landfall in Alaska today of Tropical Cyclone Merbok. Forecast 146520 had expected regional seismic enhancement in this region was likely around September 10.

 

O: 17SEP2022 05:25:54  52.8S   25.8E Mw=5.2  EMSC   SOUTH OF AFRICA              

P: 10SEP2022 146520    53.0S   19.0E 4.0-5.6 CACAA  Atlantic-Indian Ridge      

 

A moderate earthquake also shook areas of east-central California and western Nevada with M 3.5-3.6. The last aftershock of the M 6.0 on July 8, 2021 in this area of M>=3.6 occurred on  August 8, 2022 with M 4.5. This summary noted that event at the time as:

 

"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 9, 2022)

 

 

NEIC reported this earthquake of M 3.7 in Central California was felt with intensity II-III in the area(s) of Central California in Coleville Wellington, and Arnold with IV and lesser shaking in Topaz,  Murphys. Coulterville, Colfax and in Nevada at Minden and Glenbrook. Forecast 146605 had expected this earthquake was likely within about 10 km of this epicenter around September 15.

 

 

O: 17SEP2022 00:41:16  38.5N  119.5W Md=2.2  EMSC   CENTRAL CALIFORNIA

O: 17SEP2022 05:49:31  38.5N  119.5W Md=2.2  EMSC   CENTRAL CALIFORNIA

O: 16SEP2022 16:12:42  38.5N  119.5W Mw=3.6  EMSC   CENTRAL CALIFORNIA            

P: 15SEP2022 146605    38.6N  119.5W 2.5-4.8 AAAAA  California/Nevada area     

 

Earthquakes Canada (ECAN) updated the magnitude of the earthquake near Lewiston, Maine from M 2.3 to M 2.7 today. This summary had noted this event in the previous issue of this summary as:

 

 

"A light earthquake of M 2.3 was recorded in eastern Maine today. It was not reported felt in this area. The last earthquake within about 75 km of this epicenter in Maine with significantly larger magnitude  was an M 4.0+ event on October 16, 2012.

At the time this summary noted in this regard: (September 15, 2022):

 

"A moderate earthquake of M 4.0-4.6 centered about 25 km west of Portland, Maine in the Hollis area was widely felt in all the states of the northeastern U.S. today. Reports of intensity III-IV were made to the USGS from New Jersey, New York, Vermont, New Hampshire, Connecticut, Rhode Island, and Maine. This may be the strongest earthquake ever recorded in southeastern Maine. The only event of similar magnitude and intensity in the region according to the catalog

"Seismicity of the United States" was an M 4.4-4.7 which occurred on April 26, 1957. It was felt with intensity VI like today's event. Minor damage was reported in Cumberland County at Portland and Westbrook. Windows and dishes broke in Westbrook and plaster and walls cracked and merchandise fell from shelves in Portland. The epicenter of today's earthquake is about 20 km to the west of this earlier event. Other slightly smaller events in the area of southeastern Maine occurred on August 21, 1918 with M 4.2 new Norway, Maine. Water levels in Lake Sebago temporarily dropped 10 cm in this event. An earthquake on July 15, 1905 was centered in Gardiner, near Augusta, Maine and did some damage to chimneys. An earthquake on December  23, 1857 near Lewiston was also felt with intensity VI but was not assigned a magnitude. It was felt throughout much of southeastern Maine with damage in the Portland region. The earthquake was probably felt lightly in the  area of the second U.S. Presidential Debate in New York which occurred several hours later." (October 16, 2012)

 

Forecast 146672 had expected this event within about 50 km of this epicenter was likely around September 16.

 

O: 16SEP2022 02:29:26  44.3N   70.7W MB=2.7  ECAN of Lewiston, ME                

P: 16SEP2022 146672    44.0N   70.0W 2.0-3.9 AAAAA  Maine                      

 

An unusual M 3.4-3.8 also shook the Hawaiian Island of Maui today. The only earthquake

of M>=3.4 in the Maui region in the past two years occurred as an M 3.4

on June 21, 2021 and was noted in this summary at the time

as:

 

"An unusual M 3.4 hit the Maui region of Hawaii today.  NEIC reported this earthquake of M 3.3 in Maui, Hawaii was felt with intensity II-III in the area(s) of Maui, Hawaii at Hawi, Waikoloa, Kamuela, Kailua Kona, Honokaa, Kula and Captain Cook.

This is the strongest earthquake in Maui since a M 3.6-3.8 on September 5, 2020." (June 21-22, 2021)

 

Like today's event that of June, 2021 was accompanied by an M 6.0 in the central Kermadec Islands of New Zealand near the M 5.7 in that area today. Forecast 146587 had expected today's event in Maui was likely within about

50 km around September 18.

 

NEIC reported this earthquake of M 3.8 in Maui, Hawai was felt with intensity II-III in the area(s) of Maui, Hawaii in Lanai City, Kihei, Lahaina, Kula, Wailuku, Makawao, Kaunakakai, Kualapuu and Kamuela. This epicenter is at the seventh node (52 degrees) from the M 7.0 in the Loyalty Islands of September 14, 2022 and may have been promoted by energy from that source.

 

O: 16SEP2022 16:19:55  20.3N  156.5W ML=3.4  EMSC   MAUI REGION, HAWAII          

O: 16SEP2022 16:19:55  20.3N  156.5W ML=3.8  ANSS   MAUI REGION, HAWAII          

P: 18SEP2022 146587    20.1N  156.1W 4.0-5.4 AAAAA  Hawaii area                

 

Two unusually large solar flares  occurred today. An M6.2 (#2180) and an M7.9 (#2110) were the some of the largest M-class flares in the past year. The largest were an M9.6 on March 31, 2021; an M 9.6 on April 21, 2022 and an M 8.6 on August 29, 2022.  Flare 2180 occurred minutes before the M 3.8 in Maui, Hawaii and probably helped trigger that event through SFE. Large solar flares often are immediately followed by significant seismic events on the earth. The M6.2 flare occurred while Taiwan was at local solar midnight and may tend to further enhance seismicity in that region, recently stressed by Typhoon Muifa.

 

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

#-------------------------------------------------------------------------------

 

2110       0944   0949      0956   M7.9      (September 16, 2022)   3.0E-02  

2180       1549   1559      1612   M6.2      (September 16, 2022)   5.7E-02  

 

UNUSUAL DEEP FOCUS QUAKE IN ANDREANOF ISLANDS RELATED TO TYPHOON MERBOK

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 15, 2022

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in the western Andreanof Islands, Aleutians, Alaska. This is the strongest earthquake at intermediate or deep focal depth in the Andreanof Islands area since an M 4.8 on February 18, 2019.   Today's quake  occurred at depth 234 km, the deepest focal depth of any event in the region of this magnitude or larger since an M 4.8 on October 30, 2018 at 240 km depth The only other event of the magnitude or larger which was at deeper focal depth than today's was an M 4.6 at 254 km on January 2, 2009. This summary had expected elevated seismicity in this region was likely at this time as Typhoon Merbok was approaching the area. This is the strongest typhoon to impact

the Aleutians in near a decade.

 

 

"Typhoon Merbok (TD 15W) continued today in the North Pacific Ocean with winds up to 80 kts. It is expected to track to the northeast over the next several days reaching the Aleutians around September 16 as a typhoon. A moderate to strong earthquake is possible in the central Aleutians as this storm passes through." (September 14-15, 2022)

 

and

 

"Typhoon Merbok (TD 15W) continued today in the North Pacific Ocean with winds up to 80 kts. It is expected to track to the northeast over the next several days reaching the Aleutians around September 18 as a typhoon. This is one of the strongest tropical storms to threaten the Aleutians in the last decade. A moderate to strong earthquake is possible in the central Aleutians as this storm passes through." (September 15-16, 2022)

 

Forecast 146706 had expected today's earthquake was likely in mid-September.

 

O: 15SEP2022 14:02:38  52.6N  179.9W mb=4.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 12SEP2022 146706    51.1N  180.0W 3.5-5.3 BBAAA  Andreanoff Isls, Aleutians 

 

A moderate earthquake of M 4.4 also occurred today off the coast of Oregon. NEIC reported it was felt with intensity I-III in Oregon at Junction City, Lincoln City, Rockaway Beach and Nehalem. The is the strongest earthquake within about 150 km of this epicenter off the  coast of Oregon since an M 4.7 on October  24, 2021.  Forecast 146687 had expected activity in this area was likely around September 16.

 

O: 15SEP2022 09:21:37  43.2N  126.5W mb=4.4  EMSC   OFF COAST OF OREGON          

P: 16SEP2022 146687    41.8N  126.9W 2.5-4.7 ABAAA  Off Coast of No. Calif     

 

Enhanced seismicity also continued in the San Francisco Bay area of California today. This summary noted this in the previous issue as:

 

"Two light earthquake shook the area of Central California near San Francisco today with an M 2.8 south of San Francisco and an M 2.7 to the north. These continue enhanced seismicity in the area of the past several days which has included an M 4.4 and 4.0 in the Geysers area north of this yesterday. Forecasts 146607, 146608 and 146609 had expected this activity within about 20-50 km was likely between September 13 and 17. This activity is at 102-103 degrees from the M 6.6 in Sichuan, China of September 5, 2022 and was probably promoted by energy from that source." (September 14-15, 2022)

 

Forecast 146609 had expected today's event within about 50 km was likely around September 14.

 

NEIC reported this earthquake of M 2.9 in the San Francisco Bay, California was felt with intensity II-III in the area(s) of the San Francisco Bay, California at Oakland, Berkeley, Emeryville, among others.

 

O: 15SEP2022 15:08:58  37.9N  122.2W Md=2.4  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 15SEP2022 09:41:16  37.9N  122.2W Md=2.9  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 14SEP2022 146609    37.8N  122.6W 2.5-4.6 AAAAA  Central California         

 

A light earthquake was also felt east of San Francisco in central California today. This earthquake occurred within several minutes of local solar noon and was likely promoted by high tidal stresses which maximize near this hour.

NEIC reported this earthquake of M 3.3 in Central California was felt with intensity II-III in the area(s) of Central California in Los Banos, Hollister, Merced, Modesto, San Jose.  Forecast 14660 had expected this event was likely around September 13.

 

O: 15SEP2022 20:07:04  37.0N  121.0W ML=3.1  EMSC   CENTRAL CALIFORNIA           

P: 13SEP2022 146608    37.2N  122.1W 2.5-4.5 AAAAA  Central California         

 

The series of moderate earthquakes in northern Iceland is winding down. Only two light earthquakes were located in Iceland today - an M 3.5 in the volcanic area of southern Iceland and an M 3.4 in northern Iceland. These events had been expected in mid-September within about 100 km of these epicenters.

 

O: 15SEP2022 13:36:28  63.9N   22.0W ML=3.5  EMSC   ICELAND REGION               

P: 19SEP2022 146734    63.0N   26.0W 3.0-4.5 BABAA  Iceland area               

 

O: 15SEP2022 20:32:11  66.7N   17.8W ML=3.4  EMSC   ICELAND REGION               

P: 14SEP2022 146734    66.0N   17.0W 3.0-4.5 AAAAA  Iceland area               

 

A series of light earthquake occurred today in western Australia. The largest of these was an M 3.0 but was not reported felt in the area. Forecast 146504 had expected this activity around September 7.

 

O: 15SEP2022 20:00:28  33.3S  117.0E ML=3.0  EMSC   WESTERN AUSTRALIA            

P:  7SEP2022 146504    30.0S  118.0E 2.0-3.6 CCAAA  Central Australia          

 

A light earthquake of M 2.3 was recorded in eastern Maine today. It was not reported felt in this area. The last earthquake within about 75 km of this epicenter in Maine with significantly larger magnitude  was an M 4.0+ event on October 16, 2012.

At the time this summary noted in this regard:

 

"A moderate earthquake of M 4.0-4.6 centered about 25 km west of Portland, Maine in the Hollis area was widely felt in all the states of the northeastern  U.S. today. Reports of intensity III-IV were made to the USGS from New Jersey,

New York, Vermont, New Hampshire, Connecticut, Rhode Island, and Maine. This may be the strongest earthquake ever recorded in southeastern Maine. The only event of similar magnitude and intensity in the region according to the catalog

"Seismicity of the United States" was an M 4.4-4.7 which occurred on April 26, 1957. It was felt with intensity VI like today's event. Minor damage was reported in Cumberland County at Portland and Westbrook. Windows and dishes broke in Westbrook and plaster and walls cracked and merchandise fell from shelves in Portland. The epicenter of today's earthquake is about 20 km to the west of this earlier event. Other  slightly smaller events in the area of southeastern Maine occurred on August 21, 1918 with M 4.2 new Norway, Maine. Water levels in Lake Sebago temporarily dropped 10 cm in this event. An earthquake on July 15, 1905 was centered in Gardiner, near Augusta, Maine and did some damage to chimneys. An earthquake on December 23, 1857 near Lewiston was also felt with intensity VI but was not assigned a magnitude. It was felt throughout much of southeastern Maine with damage in the Portland region. The earthquake was probably felt lightly in the area of the second U.S. Presidential Debate in New York which occurred several hours later." (October 16, 2012)

 

Forecast 146672 had expected today’s earthquake was likely in this area around September 16.

 

O: 16SEP2022 02:29:26  44.3N   70.7W mb=2.3  EMSC   MAINE                         

P: 16SEP2022 146672    44.0N   70.0W 2.0-3.9 AAAAA  Maine                      

 

MAJOR EARTHQUAKE SHAKES NEW CALEDONIA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 14, 2022

 

A major M 7.0-7.1 earthquake occurred in the region of the Loyalty Islands today. NEIC reported it was felt with maximum intensity VII in Houailu, North New Caledonia and III in South New Caledonia at We Iles, Vao, Noumea and in Vila Shefa, Vanuatu. This earthquake occurred at a depth of 145 km and no tsunami was expected or observed. This is the strongest earthquake within about 250 km in the Loyalty Islands since an M 7.7 on February 10, 2021. An M 6.9-7.0 occurred on March 31 as part of a regional activation in late March and mid-February, 2022. It follows a major earthquake of M 7.6 four days ago in Papua New Guinea and the end of the second strongest geomagnetic storm in the past 15 years and is located near the geomagnetic equator. It may have been promoted by geomagnetic and telluric currents. Forecast 146761 had expected this area of the Loyalty Islands was likely to see enhanced seismicity around September 14.

 

O: 14SEP2022 11:04:07  21.2S  170.3E Mw=7.0  EMSC   SOUTHEAST OF LOYALTY ISLANDS 

P: 14SEP2022 146761    22.0S  172.0E 4.0-5.4 AABAA  Loyalty Islands            

 

This event in the Loyalty Islands may have been triggered by an M1.1 solar flare (#1450), near local solar midnight,  the strongest observed today and the second strongest in the past two weeks. A stronger flare of M1.7 occurred September 12, 2022.  Today's flare occurred with the following parameters from SWPC:

 

 

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

#-------------------------------------------------------------------------------

 

1450       0941   1019      1043   M1.1      (September 14, 2022)   2.7E-02  

1450       0948   1007      1056   SF        (September 14, 2022)  

 

Areas identified in previous issues of this summary as most susceptible to far field triggering from major earthquakes in the Loyalty Islands include:

 

 

Outer shadow zone edge (141-148 degrees)

Loyalty Islands to Dodecanese Islands, Greece, Turkey, Poland, Ukarine, Cyprus, Bulgaria, North Macedonia, Bosnia and Herzgovina, Eastern Mediterranean, Crete, Black Sea, Northern, Central Mid-Atlantic, Poland, Bulgaria, Turkey, 

 

Node 3 (120 degrees)

Loyalty Islands to Virginia, Haiti, New York State, Southern Iran,  

 

 

P- and S- shadow zone edge and node 7 (101-110 degrees)

Loyalty Islands to Guatemala, Oklahoma, Western Texas, Mongolia, Southern Texas, Oaxaca, Bouvet Is, Carlsberg Ridge, Ecuador, Argentina, eastern Mexico, Kashmir, Nicaragua, Texas,  

 

Node 4 (90 degrees)

Loyalty Islands to Southern Alaska, southern, central  California, Gulf of California, 

 

Node 5 (72 degrees)

Loyalty Islands to Sumatra, Kuril Islands, 

 

Node 6 (60 degrees)

Loyalty Islands to Bonin Islands, 

 

Node 7 (52 degrees)

Loyalty Islands to Sulawesi, Indonesia,

 

Two light earthquakes shook the area of Central California near San Francisco today with an M 2.8 south of San Francisco and an M 2.7 to the north. These continue enhanced seismicity in the area of the past several days which has included an M 4.4 and 4.0 in the Geysers area north of this yesterday. Forecasts 146607, 146608 and 146609 had expected this activity within about 20-50 km was likely between September 13 and 17. This activity is at 102-103 degrees from the M 6.6 in Sichuan, China of September 5, 2022 and was probably promoted by energy from that source.

 

O: 14SEP2022 13:06:55  36.8N  121.6W Md=2.8  EMSC   CENTRAL CALIFORNIA           

P: 13SEP2022 146608    37.2N  122.1W 2.5-4.5 AAAAA  Central California         

P: 17SEP2022 146607    36.7N  121.4W 2.5-4.9 BAAAA  Central California         

 

NEIC reported this earthquake of M 2.8 in Central California was felt with intensity II-III in the area(s) of Central California in San Juan Bautista, Salinas, Los Banos.

 

 

O: 14SEP2022 18:55:06  38.3N  122.4W Md=2.7  EMSC   NORTHERN CALIFORNIA          

P: 14SEP2022 146609    37.8N  122.6W 2.5-4.6 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.7 in Central California was felt with intensity II-III in the area(s) of Central California in Sonoma, Napa, Glen Ellen, Yountville, Santa Rosa, Vallejo and Rohert Park.

 

An earthquake in Nicaragua of M 5.2 preceded the Loyalty Islands event by about an hour.  NEIC reported this earthquake of M 5.2 in Nicaragua was felt with intensity II-III in the area(s) of Nicaragua in Managua, Ticuantepe and Masatepe.  A foreshock of M 4.6 was felt with intensity IV at Catrina, Nicaragua and in Honduras with II in Choluteca, Tegucigalpa. This event is at 105 degrees from the Loyalty Islands. Other earthquakes near 103 degrees from the Loyalty Islands today occurred in Central Chile, Guatemala, Oklahoma, San Salvador, India. Forecasts 146561 and 146572 had expected this activity was likely in mid-September.

 

O: 14SEP2022 08:44:35  12.6N   87.8W Mw=5.2  EMSC   NEAR COAST OF NICARAGUA

O: 14SEP2022 07:37:30  12.9N   87.4W ML=4.0  EMSC   NEAR COAST OF NICARAGUA      

P: 12SEP2022 146561    13.0N   89.0W 3.5-5.5 AABAA  Coast of Central America   

P: 17SEP2022 146572    12.0N   86.0W 3.5-5.3 BABAA  Nicaragua                  

P: 20SEP2022 146572    13.0N   87.0W 3.5-5.5 CAAAA  Nicaragua                  

 

 

UNUSUAL MODERATE QUAKE HITS EAST OF SAMOA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 13, 2022

 

An unusual earthquake occurred with M 5.8 east of Samoa today.  NEIC reported this earthquake of M 5.8 in American Samoa was felt with intensity II-III in the area(s) of American Samoa in Faga'itua, Apia and American Samoa. This is the strongest earthquake within about 250 km of this epicenter near Samoa since an M 6.2 about 200 km northwest of this epicenter on October 7, 2003. No other such earthquakes have occurred in this area or in the region east of this in the past 30 years. Forecast 146746 had expected enhanced seismicity in the region of Samoa was likely around September 13.

 

O: 14SEP2022 05:08:06  16.8S  168.8W Mw=5.8  EMSC   SAMOA ISLANDS REGION         

P: 13SEP2022 146746    15.0S  173.0W 4.0-5.4 ABCAA  Samoa Islands              

 

 

A series of moderate earthquakes hit the region of Taiwan and to the north today. This included an M 4.9-5.3 in southern Taiwan and events of M 4.4, 4.4 and 4.9 northeast of Taiwan near the Ryukyu Islands. CWB reported the M 5.3 in Taiwan was felt with intensity IV in Taitung, II in Pingtung, Tainan, Chiayi, Yunlin, Kaohsiung, Hualien and I in Nantou and Changhua Counties, Taiwan. NEIC reported this earthquake of M 4.9 in Southern Taiwan was felt with intensity II-III in the area(s) of Southern Taiwan in Kaohsiung County. The last event in Taiwan reported with M>=5.3 was an M 5.4 on June 28, 2022. The last of significantly larger magnitude was an M 5.9 on June 20, 2022. These are probably aftershocks of the M 6.7 north of today's epicenter on March 22, 2022. This activity follows the passage of Typhoon Muifa over Taiwan and the  epicenters to the north over the past three days. This summary had expected this seismic reaction to this storm as:

 

"Typhoon Muifa (14W) continued today over Taiwan with winds up to 140 kts. It is expected to track to the northwest over the next several days and may help promote seismicity in the  region of Taiwan and the Ryukyu Islands in the next several days." (September 11-12, 2022)

 

Forecast 146597 had expected today's event was likely within about 150 km around September 15. 

 

O: 14SEP2022 01:35:49  22.4N  121.5E mb=4.9  EMSC   TAIWAN REGION                

O: 14SEP2022 01:35:51  22.5N  121.4E ML=5.3  TAI    Hualien, Taiwan              

P: 15SEP2022 146597    24.0N  121.0E 4.0-5.4 ABAAA  Taiwan                     

 

Typhoon Muifa passed over the epicenters northeast of Taiwan on September 13 about the time these three earthquakes occurred. It is likely that stresses from this storm probably helped trigger these events. The M 4.9 occurred within minutes of local solar midnight and was also probably promoted by high tidal stresses which maximize near this hour. Forecasts 146594 had expected this activity was likely in mid-September.

 

O: 13SEP2022 16:19:20  26.3N  125.9E mb=4.4  EMSC   NORTHEAST OF TAIWAN

O: 13SEP2022 15:22:29  26.4N  125.9E mb=4.9  EMSC   NORTHEAST OF TAIWAN

O: 13SEP2022 15:33:35  26.5N  125.9E mb=4.4  EMSC   NORTHEAST OF TAIWAN           

P: 14SEP2022 146594    28.0N  127.0E 4.0-5.4 ABAAA  Ryukyu Islands             

P: 20SEP2022 146594    27.0N  125.0E 4.0-5.4 CAAAA  Ryukyu Islands             

 

An M 5.5 also was lightly felt in Guam today.  NEIC reported this earthquake of M 5.3 in Guam was felt with intensity II-III in the area(s) of Guam in Hagatna.

Typhoon Hinnamnor passed near Guam in late August and may have promoted this seismicity. Guam is located near 103 degrees from the M 6.8 near Easter Island of July 12, 2022 and 145 degrees from the M 7.2 in southern Peru of late May 26, 2022 and may have had its seismicity promoted by energy from these sources. Forecast 146582 had expected this activity within about 200 km was likely around September 18.

 

O: 14SEP2022 04:05:44  12.1N  143.6E mb=5.5  EMSC   GUAM REGION                  

P: 18SEP2022 146582    13.0N  145.0E 4.0-5.4 BABAA  So. Marianas/Guam          

 

The strongest earthquake in the U.S. or Canada today was an unusually large M 4.4 in the Geysers region of Northern California. It was followed by an M 3.9 aftershock a minute later. NEIC reported it was felt with intensity V in Santa Rosa, Fulton, IV in Windsor, Rohnert Park, Sebastopol, Calistoga, Healdsburg, Monte Rio, Occidental, Jenner with lesser shaking within 500 km in northern California. The last earthquake in northern California within the Geysers area of equal or larger magnitude occurred on December 14, 2016 with M 5.0.   Forecast 146610 had expected today's event within about 25 km was likely around September 14. This activity is located at 100 degrees from the M 6.6 in Sichuan, China of September 5, 2022 and may have been promoted by energy from that source.

 

O: 14SEP2022 01:40:20  38.5N  122.7W ML=3.9  EMSC   NORTHERN CALIFORNIA

O: 14SEP2022 01:39:39  38.5N  122.7W Mw=4.4  EMSC   NORTHERN CALIFORNIA          

P: 14SEP2022 146610    38.7N  122.7W 2.5-4.8 AAAAA  Central California         

 

A series of unusual earthquakes occurred today at 144 degrees from the M 7.6 in

New Guinea of September 10. These were located in the Virgin Islands (M 4.1), Venezuela (M 4.7), Gibraltar (M 3.9) and the southern Atlantic (M 5.1). These were expected at this distance in the summary of September 11 as:

 

"This event of M 7.4-7.6 is large enough to generate a classical far-field aftershock sequence. Some of the regions which may see enhanced seismicity following this major earthquake include at 180 degrees - the central Mid Atlantic (7N 34W), 144 degrees - Spain, Gibraltar, Puerto Rico, Dominican Republic" (September 10-11, 2022)

 

 

MODERATE QUAKE IN MINDANAO, PHILIPPINES

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 12, 2022

 

Seismicity around the world today remained at quiet to moderate levels. The strongest earthquake in the world today was an M 5.7 in southern Philippines east of Mindanao. It was not reported felt in this area. SWPC reports that a proton storm is likely in the next three days. A proton storm disrupts the ionospheric ring currents by combining with loose electrons forming hydrogen atoms which  are neutral and are not part of the electronic ring currents in the ionosphere and reduces the strength of that current. This in turn, reduces the induced current in the earth beneath these ionospheric currents lessening the likelihood of induced seismicity from this source.

 

The M 5.6-5.7 in the area east of Mindanao, Philippines today was a bit to the east of the normal seismicity in this region. A series of quakes of M 6.1, 6.0, 4.5 and 6.0 hit northeast of this epicenter in April and May, 2022 but the last of larger magnitude within about 200 km and to the east of today's epicenter was an M 6.9 on March 11, 1997. Today' event was not reported felt. Forecast 146533 had expected regional seismic enhancement around September 12.

 

O: 12SEP2022 08:14:40   6.2N  127.6E Mw=5.6  EMSC   PHILIPPINE ISLANDS REGION    

P: 12SEP2022 146533     6.0N  125.0E 4.0-5.4 AACAA  Mindanao, Philippines      

 

Aftershocks began to occur in Papua New Guinea today as well. The area around the M 7.6 of September 10 had been surprisingly quiet since that event. This can indicate that stress had been built up and that another large earthquake was possible in this area.  NEIC reported this earthquake of M 5.2 in Papua New Guinea was felt with intensity II-III in the area(s) of Papua New Guinea in Kainantu (IV), Lae Morobe, and Goroka.  The largest evnet in the area today was an M 5.2 and an M 4.4 aftershock. The M 5.2 occurred near local midnight and may have been promoted by tidal stresses which maximize near this hour.

 

O: 12SEP2022 15:00:11   6.3S  146.4E mb=5.2  EMSC   EASTERN NEW GUINEA REG., P.N.G

O: 13SEP2022 01:44:14   6.3S  146.7E mb=4.4  EMSC   EASTERN NEW GUINEA REG., P.N.G.

P: 13SEP2022 146544     6.0S  146.0E 4.0-5.4 AAAAA  New Ireland                

 

A series of moderate earthquakes also occurred in the world's southern oceans today. These occurred in the Southern Mid-Atlantic Ridge (M 4.8); the southwest Indian Rise (M 4.9), the West Chile Rise (M 4.6) and the South Sandwich Islands (M 5.0). Forecast 146766, 146501, and 146775 had expected the events in the Atlantic, the Indian and the Pacific Oceans respectively within about 50 km of these epicenters were likely in mid-September. Forecast 146791 missed the epicenter of the M 5.0 east of the Sandwich Islands placing the most likely location to the south west of this epicenter was likely around September 20.

 

The earthquake in the Southern Mid-Atlantic of M 4.8 was located at 145 degrees from the M 7.6 in New Guinea of September 10 and was probably promoted by energy from that source. Other earthquake at this distance from New Guinea occurred in Puerto Rico.

 

O: 12SEP2022 16:29:28  20.4S   11.7W mb=4.8  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

P: 17SEP2022 146766    20.0S   12.0W 4.0-5.8 BAAAA  So. Mid-Atlantic Ridge     

 

O: 12SEP2022 16:38:21  28.3S   62.6E mb=4.9  EMSC   SOUTHWEST INDIAN RIDGE       

P:  5SEP2022 146501    29.0S   62.0E 4.0-5.4 CAAAA  So. Indian Ocean           

 

The M 4.6 in the West Chile Rise was at 145 degrees from the M 7.0 in Luzon, Philippines of July 27 and was probably promoted by energy from  that source.

This and the earthquake in the South Sandwich Islands are near the 100-103 degrees distance from New Guinea and may have been promoted by energy from that source.

 

O: 12SEP2022 08:20:11  40.9S   90.2W mb=4.6  EMSC   WEST CHILE RISE              

P: 18SEP2022 146775    41.0S   91.0W 4.0-5.4 CAAAA  Chile Rise                 

 

O: 13SEP2022 03:38:54  58.7S   16.2W mb=5.0  EMSC   EAST OF SOUTH SANDWICH ISLANDS

P: 20SEP2022 146791    61.0S   22.0W 4.0-5.6 CCCAA  Southern  Ocean            

 

The strongest earthquake in the U.S. or Canada today was an  M 4.4 in the Alaska Peninsula. This is the largest earthquake within about 150 km of this epicenter since an M 5.0 on August 17 and an M 5.1 on June 2, 2022.  These are aftershocks of the M 8.2 of July 29, 2021. Forecast 146704 had expected today's event within about 75 km was likely around September 14.

 

O: 12SEP2022 18:46:30  56.4N  156.7W mb=4.4  EMSC   ALASKA PENINSULA             

P: 14SEP2022 146704    56.8N  157.7W 3.5-4.9 AAAAA  Alaska Peninsula           

QUIET SEISMICITY FOLLOWS ACTIVE CONDITIONS

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 11, 2022

 

It was a relatively quiet day in global seismicity. The largest quake was an

M 5.5 in the Fiji Islands. This event was felt lightly in the epicentral area. This follows active conditions including an M 7.6-7.7 in New Guinea yesterday. The most abundant seismicity in the world occurred in New Guinea and Indonesia as shocks in the continuing seismic activation of that area associated with the full moon and the end of the second strongest geomagnetic storm in 15 years. Activity expected with the full moon was identified in this and previous summaries as:

 

 

"The full moon arrived at 09:59 UT on September 10, 2022. Longitudes which were at local solar noon are near 30 degrees East while those of local solar midnight are at 150 degrees West Longitude. These include areas of Alaska, Hawaii and the Pacific-Antarctic Ridge in the west and Greece, Turkey, eastern Europe and the East African Rift valley in the east. These areas may see enhanced seismicity in the next week from stresses associated with this alignment. Other areas may also see enhanced seismicity most likely around local solar noon and midnight. While the period around the full moon is normally less seismically active than the new moon, if a major geomagnetic storm occurs in this time period, it could help trigger strong to major seismicity associated with the full moon." (September 8-11, 2022)

 

and that associated with the geomagnetic storm as:

 

 

"The geomagnetic field saw quiet conditions today. The AP level was 9. High latitudes saw disturbed conditions with AP 15.  This appears to conclude a strong geomagnetic storm  which is likely to increase to enhance global seismicity especially near the geomagnetic equator and at high latitudes over the next several days.  This is the second strongest geomagnetic storm in the past 16 years. The only storm of greater intensity in this time was a disturbance on  November 4, 2021 when global AP was 69 and high latitude AP reached 131." (September 4-11, 2022)

 

The M 5.5 in Fiji is the strongest earthquake within about 150 km of that epicenter since an M 6.1 on March 7, 2022.  Forecast 146768 had expected this event within about 100 km was likely around September 13.

 

O: 11SEP2022 13:10:03  20.6S  177.3W mb=4.4  EMSC   FIJI REGION                  

O: 11SEP2022 09:06:51  21.0S  179.0W mb=5.5  EMSC   FIJI REGION                  

P: 13SEP2022 146768    20.0S  179.0W 4.0-5.4 AAAAA  Tonga Islands              

 

An earthquake of M 2.7-2.9 shook the area of San Francisco Bay today. NEIC reported this earthquake of M 2.9 in San Francisco Bay, California was felt with intensity II-III in the area(s) of San Francisco Bay, California in Oakland, Orinda, Berkeley among others. This is the strongest earthquake in San Francisco since an M 2.9 on February 16, 2022 and prior to that an M 3.2 on February 12, 2022. The only event of significantly larger magnitude in San Francisco in the past year was an M 3.9 on November 17, 2021. Like today's event the earthquake in November, 2021 followed the strongest geomagnetic storm in the past 15 years at the time of the full moon as noted in this summary at the time.

 

"Global and regional seismicity was at considerably higher levels today. While no strong earthquakes were recorded, moderate and widely felt earthquakes occurred in many areas including an M 4.0 in San Francisco, California and an M 5.5 under Central Argentina. This activity is probably related to tidal stresses associated with the full moon and lunar eclipse coming tomorrow and the two-day geomagnetic storm current in progress." (November 17, 2021)

 

Forecast 146357 had expected today's event within about 15 km was likely around September 9. 

 

O: 12SEP2022 05:31:30  37.9N  122.2W ML=2.7  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P:  9SEP2022 146357    38.0N  122.3W 2.5-4.5 BAAAA  Central California         

 

MAJOR EARTHQUAKE IN PAPUA NEW GUINEA FOLLOWS STRONG QUAKE IN SUMATRA, INDONESIA

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 10, 2022

 

 

A major earthquake of M 7.6-7.7 struck Papua New Guinea today. NEIC reported it was felt with intensity VIII in New Guinea at Kainantu, Lae, Morobe, Bulolo, Madang, and Kokoda Oro, VI in Goroka, Kundiswa, Mount Hagen, V in Mendi, III in Kerema Gulf. This earthquake is the strongest earthquake in the earth in more than a year.  The last event of M>=7.6 occurred in the South Sandwich Islands on August 12, 2021 with M 8.1 and prior to that in the Alaska Peninsula on July 29, 2021. Strong foreshocks hit within about 150 km of this epicenter with M 6.1 of September 2, 2022 and M 5.9 on August 13, 2022 but this is the strongest earthquake within about 300 km of this epicenter in the past 30 years. The larger previous was an M 7.2 on May 15, 2002 and an M 7.2 on May 5, 2019. Due to the depth of today's event (80-110 km), no tsunami was expected or observed following this earthquake.

 

When a regional earthquake hit about 100 km from today's epicenter on September 2, this summary related this occurrence to the geomagnetic storm which was beginning with that quake and continued through the occurrence of today's major New Guinea earthquake. It was noted in this summary at the time:

 

"The strongest earthquake in the world today was an M 6.1 in Papua New Guinea. NECI reported it was felt with intensity III in Wau, Morobe, PNG. This event occurred on the geomagnetic equator and was likely promoted by SFE from the previous storm which ended several days ago. A major geomagnetic storm is likely in the next several days and was addressed in this and previous issues of this summary as:

 

" A new geomagnetic storm due September 4, 2022 is likely to increase seismicity near the geomagnetic equator and at high latitudes." (September 1-4, 2022) 

 

 

This earthquake was most likely triggered by a combination of effects related to the end of the second largest geomagnetic storm in the past 16 years and the full moon which occurred earlier in the day. These events had been expected to trigger a major earthquake, likely in the area of Indonesia or New Guinea at the end of this geomagnetic storm and in conjunction with today's full moon astronomical tides as:

 

"The geomagnetic field saw disturbed  conditions today. The AP level was 12. High latitudes saw active conditions with AP 31.  This continues a strong geomagnetic storm  which is likely to increase to enhance global seismicity especially near the geomagnetic equator and at high latitudes over the next several days.  This is the second strongest geomagnetic storm in the past 16 years. The only storm of greater intensity in this time was a disturbance on  November 4, 2021 when global AP was 69 and high latitude AP reached 131." (September 9-10, 2022)

 

and

 

"The full moon arrived at 09:59 UT on September 10, 2022. Longitudes which were at local solar noon are near 30 degrees East while those of local solar midnight are at 150 degrees West Longitude. These include areas of Alaska, Hawaii and the Pacific-Antarctic Ridge in the west and Greece, Turkey, eastern Europe and the East African Rift valley in the east. These areas may see enhanced seismicity in the next week from stresses associated with this alignment. Other areas may also see enhanced seismicity most likely around local solar noon and midnight. While the period around the full moon is normally less seismically active than the new moon, if a major geomagnetic storm occurs in this time period, it could help trigger strong to major seismicity associated with the full moon." (September 7-10, 2022)

 

This epicenter is also near the antipode of the previous large global earthquake -  the M 6.9 in the Central Mid-Atlantic of September 4, 2022. A tropical storm passed near the antipode in the Atlantic several days ago as noted in this summary:

 

"A tropical storm may be forming in the east-central Atlantic area. This system is currently located at 15N 35W and moving to the west. It may become the first tropical storm to make landfall in the eastern Atlantic of the season. This could occur about a week from now." (September 7-8, 2022)

 

These events may also have helped provide energy to the earthquake in New Guinea today.

 

This event of M 7.4-7.6 is large enough to generate a classical far-field aftershock sequence. Some of the regions which may see enhanced seismicity following this major earthquake include at 180 degrees - the central Mid-Atlantic (7N 34W), 144 degrees - Spain, Gibraltar, Puerto Rico, Dominican Republic; 120 degrees - Chiapas, Mexico, Guatemala, Greece, Iceland,

Missouri; 101-107 degrees - Montana, Baja California, eastern Turkey, East Pacific Rise, 90 degrees  - Southeastern Alaska, Southern Iran, 72 degrees - Alaska Peninsula, Siberia, Sakhalin, northern China, India,  60 degrees - Kurils, Aleutians, and 52 degrees - Honshu, Japan, Sumatra, South Island, New Zealand, Hawaii,

 

The earthquake in Papua New Guinea may have been triggered by the strongest solar flare recorded by SWPC today - a C2.8 flare which began within a minute of the occurrence of the New Guinea quake. Parameters for this flare from SWPC follow:

 

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

#-------------------------------------------------------------------------------

 

 220       2347   0009      0024   C2.8      (September 10, 2022)   4.1E-03  

 

Forecast 146296 had expected a moderate to strong earthquake within about 200\ km of this epicenter was likely in early September.

 

Surface waves from an M 6.4 south of Sumatra 22 minutes before the New Guinea quake and at a distance of 47 degrees to the east would have been at the New Guinea epicenter when the M 7.6 occurred there and may have been an immediate trigger for that subsequent major event.

 

O: 11SEP2022 00:42:38   5.8S  146.1E mb=5.0  EMSC   EASTERN NEW GUINEA REG., P.N.G.

O: 11SEP2022 01:27:02   6.3S  146.5E mb=4.5  EMSC   EASTERN NEW GUINEA REG., P.N.G.

O: 10SEP2022 23:46:58   6.2S  146.5E Mw=7.6  EMSC   EASTERN NEW GUINEA REG., P.N.G

O: 10SEP2022 23:46:58   6.2S  146.5E Mw=7.4  BMG    EASTERN NEW GUINEA REG., P.N.G

O: 10SEP2022 23:47:01   6.4S  146.5E Mw=7.7  PTWC   EASTERN NEW GUINEA REG., P.N.G

P:  4SEP2022 146296     4.0S  146.0E 4.0-5.4 CCAAA  New Ireland                

P:  8SEP2022 146296     3.0S  149.0E 4.0-5.4 ACCAA  New Ireland                

 

The earthquake in New Guinea followed several minutes after a pair of events of M 6.4 and M 6.2 in the area south of Sumatra, Indonesia. This appears to be an aftershock of an M 6.4 on August 29 and an M 5.9 on August 28, 2022. At the time this summary noted:

 

"Today's event in Mentawai, Indonesia is the second largest in the world in  the past month. It is also the largest event within about 200 km of this epicenter since an M 6.7 on March 13, 2022. Today's activity appears to be aftershocks of that event." (August 29, 2022)

 

Forecasts 146298 and 146286 had anticipated today's activity south of Sumatra was likely within about 150 km of this epicenter in early September. The M 6.4 occurred 22-23 minutes before the M 7.6 in New Guinea.  Surface waves from this event would have been at the New Guinea epicenter when the M 7.6 occurred there and may have been an immediate trigger for that event. This epicenter is also at the third node (120 degrees) from the M 6.9 in the Central Atlantic of September 4 and may have been promoted by energy from that source.

 

O: 10SEP2022 23:24:08   1.1S   98.8E Mw=6.4  EMSC   KEP. MENTAWAI REGION, INDONESIA

O: 11SEP2022 02:40:47   1.2S   98.5E ML=4.4  EMSC   KEP. MENTAWAI REGION, INDONESIA

O: 11SEP2022 03:29:37   1.2S   98.6E ML=4.3  EMSC   KEP. MENTAWAI REGION, INDONESIA

O: 10SEP2022 23:10:45   1.0S   98.8E Mw=6.1  EMSC   KEP. MENTAWAI REGION, INDONESI

O: 10SEP2022 23:10:45   1.1S   98.7E Mw=6.2  BMG    SOUTHERN SUMATRA, INDONESI

P:  4SEP2022 146298     2.0S   99.0E 4.0-5.4 CAAAA  So. of Sumatera            

P: 10SEP2022 146286     0.0N  100.0E 4.0-5.6 AABAA  So. Sumatera               

 

Other moderate quakes and series of events also occurred in Indonesia today. Among these was the continuing series in Papua, Indonesia which included an M 4.8 and M 4.9 and an M 5.4 south of Java. The series in Papua began yesterday and was discussed in the previous issue of this summary as:

 

 

"The strongest earthquakes in the world today were a pair of M 6.2 in the region of Papua, Indonesia. These were accompanied by an M 5.9 and a number of moderate aftershocks of M>=4. The last earthquakes of M>=6.2 within about 200 km of these epicenters occurred on June 19, 2019 with M 6.3 and as an M 7.0 on July 27, 2015  and April 6, 2013.  Strong to major earthquakes near this epicenter are near 103 degrees from southern California and have been known to be followed by significant seismicity in that area about a month later. Forecast 146307 had expected today's activity was likely within about 50 km in  early September, 2022. This activity is at 144 degrees from strong earthquakes in Argentina and Chile and at 104 degrees from the M 6.8 in Easter Island of July 12, 2022 and was probably promoted by energy from that source." (September 9-10, 2022)

 

O: 09SEP2022 23:31:49   2.2S  138.2E Mw=6.2  EMSC   PAPUA, INDONESIA

 

O: 10SEP2022 11:15:20   2.0S  138.2E mb=4.8  EMSC   PAPUA, INDONESIA

O: 10SEP2022 15:41:45   2.0S  138.3E ML=4.5  EMSC   NEAR N COAST OF PAPUA, INDONESIA

O: 10SEP2022 12:13:30   2.1S  138.3E ML=4.1  EMSC   PAPUA, INDONESIA

O: 10SEP2022 13:49:29   2.3S  138.2E mb=4.9  EMSC   PAPUA, INDONESIA

O: 11SEP2022 07:57:30   2.3S  138.2E mb=4.7  EMSC   PAPUA, INDONESIA

O: 10SEP2022 09:51:03   2.0S  138.3E ML=4.1  EMSC   PAPUA, INDONESIA             

P:  4SEP2022 146307     3.0S  138.0E 4.0-5.4 CAAAA  West Irian, PNG            

 

O: 11SEP2022 06:57:22  10.9S  110.8E ML=4.6  EMSC   SOUTH OF JAVA, INDONESIA     

O: 11SEP2022 04:16:32  11.0S  110.8E mb=5.4  EMSC   SOUTH OF JAVA, INDONESIA

P:  6SEP2022 146491    10.0S  109.0E 4.0-5.6 BABAA  So. of Java                

 

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in the Near  Islands, Aleutians, Alaska. It was not reported felt in this remote area. The last event of larger magnitude in the Near Islands was an M 4.8 on July 6, 2022 and prior to that an M 5.2 on March 1, 2022. Forecast 146463 had expected regional seismic enhancement was likely in this area around September 7.

 

O: 10SEP2022 17:22:42  53.0N  173.4E mb=4.7  EMSC   NEAR ISLANDS, ALEUTIAN ISLANDS

P:  7SEP2022 146463    52.0N  179.0E 4.0-5.6 BACAA  Rat Islands                

 

The series of events in northern Iceland also continued today. The largest of today's events were M 4.2 and 4.1. Forecast 146476 had expected this activity was likely ain early September. This swarm is at the third node (120 degrees) from the M 7.7 in New Guinea today. This activity is located at the fourth node (90 degrees) from the M 7.0 in Luzon, Philippines of July 27 and may have been promoted by energy from that source. An M 4.7 in France was likewise located at the fourth node from Luzon. These two epicenters are also at the fifth node (72 degrees) from the M 6.6 in Sichuan, China of September 5, 2022 and may have been affected by energy from that source.

 

O: 10SEP2022 14:55:49  66.2N   18.4W ML=3.3  EMSC   ICELAND REGION

O: 10SEP2022 14:44:29  66.5N   17.6W ML=4.1  EMSC   ICELAND REGION

O: 10SEP2022 15:37:10  66.5N   17.6W ML=3.4  EMSC   ICELAND REGION

O: 10SEP2022 17:23:52  66.5N   17.5W ML=3.6  EMSC   ICELAND REGION

O: 11SEP2022 04:30:21  66.5N   17.6W ML=3.6  EMSC   ICELAND REGION

O: 11SEP2022 05:39:14  66.5N   17.6W ML=3.2  EMSC   ICELAND REGION

O: 10SEP2022 19:09:07  66.9N   18.8W ML=4.2  EMSC   ICELAND REGION               

P:  2SEP2022 146476    67.0N   17.0W 3.0-4.8 CAAAA  Iceland area               

 

A moderate earthquake of M 4.3-4.7 also struck the border of France and Germany today. NEIC reported it was felt with intensity IV in France at Landser, Riediesheim, Alsace, Habsheim, Walheim, Rixheim, Uffheim,  and III in Aspach, laxlanden, Mulhouse, Lutterback. It was followed by light earthquakes which were felt lightly in this epicentral area. At M 4.7, this is the strongest earthquake within about 200 km of this epicenter since an M 4.7 on February 23, 2008 and an M 4.8 on December 5, 2004. The last moderate earthquake in this area was an M 4.1 on July 9, 2022. Forecast 146405 had expected this event within about 50 km was likely around September 9. This earthquake in France was located at the fourth node (90 degrees) from the July 27 M 7.0 in Luzon, Philippines and may have been promoted by energy from that source.

 

O: 10SEP2022 16:07:45  47.7N    7.5E ML=2.8  EMSC   FRANCE-GERMANY BORDER REGION

O: 11SEP2022 04:00:35  47.7N    7.5E ML=3.1  EMSC   FRANCE-GERMANY BORDER REGION

O: 10SEP2022 15:58:13  47.7N    7.5E ML=4.7  EMSC   FRANCE-GERMANY BORDER REGION 

P:  9SEP2022 146405    48.0N    8.0E 3.0-5.1 AAAAA  Adriatic Sea               

 

 

 

EQUATORIAL SEISMICITY ENHANCED AT END OF GEOMAGNETIC STORM

 

EARTHQUAKE SUMMARY FOR SEPTEMBER 9, 2022

 

A surge in seismicity along the geomagnetic equator today marked the end of the second strongest geomagnetic storm in the past 16 years. Most of this was seen in the areas of Indonesia and Papua New Guinea where it began at the beginning of the storm. The strongest of this was near the antipode of the M 6.9 in the Central Mid-Atlantic of September 4, 2022. This follows the pattern expected

as outlined in earlier summaries as:

 

"The strongest earthquake in the world today was an M 6.1 in Papua New Guinea. NECI reported it was felt with intensity III in Wau, Morobe, PNG. This event occurred on the geomagnetic equator and was likely promoted by SFE from the previous storm which ended several days ago. A major geomagnetic storm is likely in the next several days and was addressed in this and previous issues of this summary as:

 

" A new geomagnetic storm due September 4, 2022 is likely to increase seismicity near the geomagnetic equator and at high latitudes." (September 1-3, 2022) 

 

and

 

"It was a relatively quiet day in global seismicity. This is consistent with a slowdown in seismicity during strong geomagnetic storms. Geomagnetic storms disrupt the ionospheric ring currents and subsequent induction of telluric currents and possibly seismicity beneath these electric currents. Normal to strong enhancement in global seismicity can occur during this time if the earthquake is hit by a powerful shock wave of solar wind emanating from a strong solar flare. However in the current case, this has not occurred. Once the ring currents regenerate at higher intensities, they can trigger additional seismicity normally about 2-4 days after the end of the geomagnetic storm. In the current situation this storm is expected to end around August 20-21.

 ...

 

 

"An earthquake of M 5.6 also occurred about 10 degrees south of the geomagnetic equator in Indonesia today. It occurred at a deep focal depth and was not reported felt on the surface.  Like activity in the area over the past day, this was probably related to the current geomagnetic storm as noted in previous issues of this summary:

 

"Following strong geomagnetic storms, in the several days after they settle down, ring currents set up at about 10 degrees either side of the geomagnetic equator. These ring currents induce telluric electric currents in the earth below them. These, in turn, change the electrical environment in these areas and help to enhance seismicity in these areas. Global seismicity today showed this pattern. A series of moderately large to large earthquakes today occurred near 10 degrees from the geomagnetic equator. These events of M 5.7-5.9 are of a magnitude, location and timing suggesting they were promoted by this induction effect. They occurred as an M 5.9 in Papua New Guinea; an M 5.7 in the Molucca Sea of Indonesia and an M 5.8 and 5.9 in central Vanuatu. Triggering  of this type is expected to continue for another day with strong earthquakes possible, especially in the southwest Pacific during the next several days." (August 15, 18-19,  2022)

 

Coming seismic enhancement in the next several days is most likely at high latitudes and near the geomagnetic equator." (August 21-23, 2022).

 

This and previous issues of this summary had anticipated a strong increase in equatorial and polar seismicity at this time. For example this summary noted:

 

 

"The geomagnetic field saw disturbed  conditions today. The AP level was 13. High latitudes saw active conditions with AP 30.  This continues a strong geomagnetic storm  which is likely to increase to enhance global seismicity especially near the geomagnetic equator and at high latitudes over the next several days.  This is the second strongest geomagnetic storm in the past 16 years. The only storm of greater intensity in this time was a disturbance on  November 4, 2021 when global AP was 69 and high latitude AP reached 131." (September 8-9, 2022)

 

Part of the enhanced seismicity today may have also been the arrival of the full moon. This was addressed in this and previous summaries as:

 

"The full moon will arrive at 09:59 UT on September 10, 2022. Longitudes which are at local solar noon are near 30 degrees East while those of local solar midnight are at 150 degrees West Longitude. These include areas of Alaska, Hawaii and the Pacific-Antarctic Ridge in the west and Greece, Turkey, eastern Europe and the East African Rift valley in the east. These areas may see enhanced seismicity in the next week from stresses associated with this alignment. Other areas may also see enhanced seismicity most likely around local solar noon and midnight. While the period around the full moon is normally less seismically active than the new moon, if a major geomagnetic storm occurs in this time period, it could help trigger strong to major seismicity associated with the full moon." (September 6-9, 2022)

 

The strongest earthquakes in the world today were a pair of M 6.2 in the region of Papua, Indonesia. These were accompanied by an M 5.9 and a number of moderate aftershocks of M>=4. The last earthquakes of M>=6.2 within about 200 km of these epicenters occurred on June 19, 2019 with M 6.3 and as an M 7.0 on July 27, 2015  and April 6, 2013.  Strong to major earthquakes near this epicenter are near 103 degrees from southern California and have been known to be followed by significant seismicity in that area about a month later. Forecast 146307 had expected today's activity was likely within about 50 km in  early September, 2022. This activity is at 144 degrees from strong earthquakes in Argentina and Chile and at 104 degrees from the M 6.8 in Easter Island of July 12, 2022 and was probably promoted by energy from that source.

 

O: 09SEP2022 23:31:49   2.2S  138.2E Mw=6.2  EMSC   PAPUA, INDONESIA

O: 09SEP2022 23:44:09   2.2S  138.2E Mw=5.9  EMSC   PAPUA, INDONESIA

O: 10SEP2022 00:05:14   2.2S  138.2E Mw=6.2  EMSC   PAPUA, INDONESIA

O: 10SEP2022 01:27:13   2.2S  138.2E mb=4.7  EMSC   PAPUA, INDONESIA

O: 10SEP2022 00:27:10   2.0S  138.3E ML=4.8  EMSC   NEAR N COAST OF PAPUA, INDONESIA

O: 10SEP2022 00:47:43   2.0S  138.4E ML=4.0  EMSC   NEAR N COAST OF PAPUA, INDONESIA

O: 10SEP2022 04:10:08   2.0S  138.3E ML=4.0  EMSC   PAPUA, INDONESIA

O: 10SEP2022 01:04:39   2.4S  138.1E mb=4.4  EMSC   PAPUA, INDONESIA              

P:  4SEP2022 146307     3.0S  138.0E 4.0-5.4 CAAAA  West Irian, PNG            

 

A series of moderate quakes also occurred in the area of Papua New Guinea today. These are near the antipode of the M 6.9 in the central Mid-Atlantic of September 4. Further activity in New Guinea to New Britain is expected during this seismic enhancement.

 

O: 10SEP2022 03:41:05   5.6S  154.4E mb=4.5  EMSC   BOUGAINVILLE REGION, P.N.G.  

P:  9SEP2022 146295     4.0S  153.0E 4.0-5.6 ABBAA  New Britain                 

 

NEIC reported this earthquake of M 4.5 in New Britain, PNG was felt with intensity II-III in the area(s) of New Britain, PNG in Kimbe.

 

O:  9SEP2022 13:12:07   6.0S  142.8E mb=5.2  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

P:  2SEP2022 146301     7.0S  144.0E 4.0-5.4 CAAAA  Papua New Guinea           

P:  7SEP2022 146301     4.0S  142.0E 4.0-5.4 ABAAA  Papua New Guinea           

 

O:  9SEP2022 09:39:57   6.1S  149.0E mb=4.5  EMSC   NEW BRITAIN REGION, P.N.G.   

P:  8SEP2022 146296     3.0S  149.0E 4.0-5.4 ACAAA  New Ireland                

 

A pair of earthquakes of M 4.8 and 5.1 also continued the elevated seismicity in the Central Atlantic region. The strongest of these was an M 5.1 which occurred within minutes of local solar noon and was probably promoted by high tidal stresses of the full moon. It is also located on the geomagnetic equator. The last earthquake within about 200 km of this epicenter in the area north of Ascension Island with M>=5.1 occurred on May 6, 2019 with M 5.4.  Forecast 146300 had expected this event within about 100 km was likely around September 8, 2022. This epicenter is at 101 degrees from the M 6.8 in Easter Island of July 12, 2022 and may have been promoted by energy from that source.

 

O: 09SEP2022 12:58:43   2.8S   12.2W mb=5.1  EMSC   NORTH OF ASCENSION ISLAND

O:  9SEP2022 17:12:36   2.7S   12.2W mb=4.8  EMSC   NORTH OF ASCENSION ISLAND    

P:  8SEP2022 146300     2.0S   13.0W 4.0-5.6 AAAAA  No. of Ascension Isl       

 

The strong swarm of events in northern Iceland also continued today. This was noted in the previous issue of this summary as:

 

 

"A strong series of moderate earthquakes including those of M 5.0, 4.5, 4.0, 4.6 hit the area of northern Iceland today. These are not part of the current volcanic eruption in the Reykjavik area of southern Iceland about 500 km away to the south. Nevertheless these events are probably related to incipient volcanism in the area. The last activity with M>=5 within about 200 km of these epicenters occurred on  June 20 and 21, 2020 with M 5.4, 5.7 and 6.0.   Forecast 146476 had expected today's activity was likely within about 25 km around September 2." (September 8, 2022)

 

It should be noted in addition to stresses on the region associated with the strong geomagnetic storm and the full moon, Hurricane Danielle was passing near Iceland at the time of this activity. With winds more than 100 kts in the North Atlantic, this is one of the strongest hurricanes in this region in many years. It had been noted in this and previous issues of this summary as:

 

"Hurricane Danielle continued today east of Nova Scotia, Canada    in the north Atlantic with winds up to 70 kts. It is expected to track to the northeast over the next several days and may help promote seismicity in the  northern mid-Atlantic and Azores next several days." (September 5-8, 2022)

(September 8-9, 2022)

 

Since the last report more than 65 earthquakes of occurred in this swarm. A new epicenter was also active about 200 km northwest of the normal swarm which included events of M 4.2 and M 4.6, the strongest of the day in the area. Forecast 146476 had expected this activity was likely northern Iceland at the beginning of September within about 50 km of these epicenters.  Following is a listing of earthquakes in this swarm of M>=4 which occurred today.

 

O: 09SEP2022 20:24:56  67.3N   20.1W ML=4.2  EMSC   ICELAND REGION

O: 09SEP2022 12:59:35  66.5N   17.6W ML=4.2  EMSC   ICELAND REGION

O: 09SEP2022 13:38:12  66.5N   17.6W ML=4.1  EMSC   ICELAND REGION

O: 09SEP2022 13:41:52  66.5N   17.7W mb=4.3  EMSC   ICELAND REGION

O: 09SEP2022 13:18:31  66.6N   17.6W ML=4.1  EMSC   ICELAND REGION

O: 09SEP2022 19:44:28  66.6N   17.8W mb=4.4  EMSC   ICELAND REGION

O: 10SEP2022 02:45:09  66.6N   17.8W mb=4.6  EMSC   ICELAND REGION

O:  9SEP2022 14:07:34  67.0N   20.2W ML=4.6  EMSC   ICELAND REGION               

P:  2SEP2022 146476    67.0N   17.0W 3.0-4.8 CAAAA  Iceland area               

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in the Kodiak

Island region of southern Alaska.  This is the strongest earthquake in the Kodiak area since an M 4.8 on January 11, 2022. The only other event in the Kodiak Island region in the past two years of larger magnitude was an M 4.9 on January 3, 2021. Today's M 4.5 occurred near local solar noon and may have been promoted by high tidal stresses with the full moon of September 10. Forecast 146444 had expected this activity to the southwest was likely around September 7.

 

O: 09SEP2022 23:08:22  56.4N  152.7W Mw=4.5  EMSC   KODIAK ISLAND REGION, ALASKA

O:  9SEP2022 13:25:10  56.3N  152.7W ML=3.1  EMSC   KODIAK ISLAND REGION, ALASKA 

P:  7SEP2022 146444    54.7N  156.9W 3.5-4.9 ABCAA  Alaska Peninsula