LIGHT EARTHQUAKE SHAKES LOS ANGELES, CALIFORNIA

 

EARTHQUAKE SUMMARY FOR OCTOBER 24, 2021

 

A light earthquake of M 3.6 was widely felt in eastern Los Angeles, California today. More than 3000 felt reports were processed by NEIC. These indicated maximum intensity IV in Los Angeles, Huntington Park and Maywood. It may have been felt lightly as far as central California and Las Vegas, Nevada. The only earthquakes in the past year within about 50 km of today's epicenter with M>=3.6 occurred on September 18, 2021 (M 4.3) and on April 5, 2021 with M 4.0. Forecasts 13740 and 138203 had expected this activity within about 25 km  was likely between October 17 and 25 with the current full moon.

 

O: 24OCT2021 14:11:10  34.0N  118.2W Ml=2.0  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 24OCT2021 14:01:01  34.0N  118.1W Mw=3.6  EMSC   GREATER LOS ANGELES AREA, CALI

P: 17OCT2021 137940    34.2N  117.8W 2.5-4.4 CAAAA  So. California             

P: 25OCT2021 138203    33.7N  117.5W 2.5-4.5 AAAAA  So. California              

 

An earthquake of M 2.7 was felt today in eastern Tennessee and North Carolina. This event was reported by NEIC to have been felt with maximum intensity IV in Tallassee, Tennessee and Sugar Grove, North Carolina and II-III in Tennessee at Vonore, Maryville, Tellico Plains, Powell, and in North Carolina at Bryson City,   Three similar earthquakes of M 2.7-2.8 hit within about 100 km of this  epicenter in the past year - on August 30, May 26 and February 12, 2021.  Forecast 138183 had expected today's event within about 50 km of this  epicenter was likely in late October.

 

O: 24OCT2021 17:55:10  35.5N   84.0W mb=2.7  EMSC   EASTERN TENNESSEE            

P: 24OCT2021 138183    35.9N   82.8W 2.0-4.1 AAAAA  Kentucky/Tennessee/NC      

P: 31OCT2021 138183    35.0N   84.0W 2.0-3.9 CAAAA  Kentucky/Tennessee/NC      

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 off the coast of Oregon. NEIC reported it was lightly felt along the coast of Oregon and Washington with I-III in Oregon at Bandon, Port Orford, Junction City, Creswell, Cloverdale, Portland, and in Tacoma and North Bend, Washington. This is the strongest earthquake off the coast of Oregon since two of M 5.9 on June 4, 2021. Forecast 138244 had expected today's event was likely within  about 10 km of this epicenter around October 23. This epicenter is at the seventh node (51 degrees) from the epicenter in Haiti where an M 7.2 did  considerable damage on August 14 and was probably promoted by energy from that source. The eruption of Cumbre Viejo in the Canary Islands is at this same distance from Haiti.

 

O: 24OCT2021 12:11:40  43.2N  126.5W mb=4.5  EMSC   OFF COAST OF OREGON          

O: 24OCT2021 12:11:40  43.2N  126.5W mb=4.7  ANSS   OFF COAST OF OREGON          

P: 23OCT2021 138244    43.1N  126.5W 3.0-4.4 AAAAA  Off Coast of Oregon        

 

A series of light to moderate earthquake hit the region of Mexico from Oaxaca to Guerrero west to Colima and Michoacan States with M 3.8-4.4. These may be a reaction to stresses associated with the imminent landfall of Hurricane Ray as noted in this and previous issues of this summary:

 

A series of moderate earthquake hit the region of Mexico from Oaxaca to Guerrero west to Colima and Michoacan States with M 3.8-4.4. These may be a reaction to stresses associated with the imminent landfall of Hurricane Rick as noted in this and previous issues of this summary:

 

"Hurricane Rick formed south of Guerrero, Mexico today with winds up to 105 kts. It is expected to make landfall in Guerrero near Zihuatanejo and Acapulco, Mexico. Enhanced seismicity is likely in the region of central and western coastal Mexico while this storm is in the area." (October 23-24, 2021)

 

O: 24OCT2021 14:41:01  16.1N   97.9W mb=4.4  EMSC   OAXACA, MEXICO               

P: 22OCT2021 138137    18.0N   97.0W 3.5-5.5 ABAAA  Oaxaca, Mexico             

 

O: 24OCT2021 15:20:34  16.4N  100.2W ML=3.9  EMSC   OFFSHORE GUERRERO, MEXICO    

P: 20OCT2021 137871    16.0N  100.0W 3.5-5.3 BAAAA  Oaxaca, Mexico             

 

O: 24OCT2021 19:13:01  19.1N  103.9W ML=3.8  EMSC   COLIMA, MEXICO               

P: 24OCT2021 138133    18.0N  103.0W 3.5-5.3 AAAAA  Michoacan, Mexico          

 

O: 24OCT2021 16:59:10  19.4N  102.1W ML=3.8  EMSC   MICHOACAN, MEXICO            

P: 24OCT2021 138133    18.0N  103.0W 3.5-5.3 ABAAA  Michoacan, Mexico          

 

The most unusual earthquake of the day was an M 5.0 in Ethiopia. This area has seen several minor earthquakes in the past 10 days with an M 4.5 on October 15 and an M 4.3 on October 17. This follows a long period of quiet in the seismicity of Ethiopia. Only on such event of M>=5 in Ethiopia has occurred in the past 10 years - an M 5.2 on March 24, 2018. The last active period of seismicity occurred in the summer of 2011 and included quakes of 5.7, 5.4 and 5.6 among others. Still today's event is at an unusual epicenter. The only event in the past 30 years within about 200 km of today's epicenter of M>=5 was an M 5.0 on February 26, 2007. Forecast 138126 had expected enhanced seismicity in Ethiopia was likely around October 23.

 

O: 24OCT2021 14:26:20  10.2N   41.3E ML=5.0  EMSC   ETHIOPIA                     

P: 23OCT2021 138126    13.0N   41.0E 3.5-5.3 ACAAA  Ethiopia                   

 

An unusually large M 4.4 shook the region of west-central India in Maharashtra today. The last earthquake within about 200 km of this epicenter with M>=4.7  occurred on April 14, 2012 with M 4.4 but the last of larger magnitude was an M 5.1

 - 12 years ago on December 12, 2009.  Forecast 138147 had expected regional seismic enhancement was likely around October 23. This epicenter is located at 145 degrees from the M 7.0 in Mexico of September 8 and may have been promoted by energy from that source.

 

O: 24OCT2021 11:37:07  17.2N   73.6E ML=4.4  EMSC   MAHARASHTRA, INDIA           

P: 23OCT2021 138147    23.0N   70.0E 3.5-4.9 ACCAA  India                      

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 24OCT2021 11:37:07  17.2N   73.6E ML=4.4  EMSC   MAHARASHTRA, INDIA           

P: 23OCT2021 138147    23.0N   70.0E 3.5-4.9 ACCAA  India                      

 

O: 24OCT2021 18:17:22  22.8N  120.5E ML=4.2  EMSC   TAIWAN                       

O: 24OCT2021 18:17:22  22.8N  120.5E ML=4.4  ANSS   TAIWAN                       

O: 24OCT2021 18:17:22  22.8N  120.5E ML=4.2  TAI    Hualien, Taiwan              

P: 22OCT2021 138157    22.0N  122.0E 4.0-5.7 AAAAA  Taiwan                     

P: 25OCT2021 138157    23.0N  122.0E 4.0-5.4 AAAAA  Taiwan                     

P: 29OCT2021 138156    21.0N  120.0E 4.0-5.4 BBAAA  Taiwan                     

 

CWB reported this earthquake was felt with intensity III in Kaohsiung; II in Pingtung and Tainan and I in Chiayi Counties, Taiwan.

NEIC reported this earthquake of M 4.4 in Taiwan was felt with intensity II-III in the area(s) of Taiwan at Kaohsiung and Tainan.

 

No significant (M>=5) or unusual earthquakes were reported in Asia today.

 

INDONESIA AND PHILIPPINES

 

O: 25OCT2021 02:30:47   0.6N  123.6E mb=4.9  EMSC   MINAHASA, SULAWESI, INDONESIA

P: 25OCT2021 138095     1.0N  124.0E 4.0-5.4 AAAAA  Mindanao, Philippines      

 

O: 24OCT2021 21:54:52   3.1N  127.9E mb=4.6  EMSC   KEPULAUAN TALAUD, INDONESIA  

P: 18OCT2021 137824     3.0N  126.0E 4.0-5.4 CABAA  Mindanao, Philippines      

 

O: 24OCT2021 18:31:32   4.4S  142.5E ML=4.0  EMSC   NEW GUINEA, PAPUA NEW GUINEA 

P: 24OCT2021 138111     5.0S  142.0E 4.0-5.4 AAAAA  Papua New Guinea           

 

O: 25OCT2021 05:21:55   5.4S  152.5E mb=5.2  EMSC   NEW BRITAIN REGION, P.N.G.   

P: 24OCT2021 138106     7.0S  153.0E 4.0-5.4 ABAAA  New Britain                

 

O: 25OCT2021 01:53:38   5.8N  125.3E ML=4.8  EMSC   MINDANAO, PHILIPPINES        

P: 25OCT2021 138095     6.0N  124.0E 4.0-5.5 AABAA  Mindanao, Philippines      

 

O: 24OCT2021 09:43:55   9.7S  108.0E mb=4.3  EMSC   SOUTH OF JAVA, INDONESIA

O: 25OCT2021 06:52:04   9.3S  107.8E mb=5.0  EMSC   SOUTH OF JAVA, INDONESIA     

P: 22OCT2021 138113     8.0S  108.0E 4.0-5.6 BBAAA  So. of Java                

P: 27OCT2021 138113     9.0S  106.0E 4.0-5.6 AABAA  So. of Java                

 

NEIC reported this earthquake of M 5.0 in Java, Indonesia was felt with intensity II-III in the area(s) of Java, Indonesia at Wengon.

 

 

CENTRAL AND SOUTH AMERICA

 

O: 24OCT2021 10:22:21  10.9N   86.4W mb=4.4  EMSC   OFF COAST OF COSTA RICA      

P: 26OCT2021 138134    10.0N   86.0W 3.5-5.5 AAAAA  Nicaragua                  

 

NEIC reported this earthquake of M 4.4 in Costa Rica was felt with intensity II-III in the area(s) of Costa Rica in Liberia and in Nandaime, Nicaragua.

 

O: 24OCT2021 10:28:36  12.2S   73.3W ML=4.5  EMSC   CENTRAL PERU                 

P: 27OCT2021 138297    11.0S   74.0W 4.0-5.9 BBAAA  Central Peru               

 

O: 24OCT2021 08:20:21  16.0N   60.3W mb=4.4  EMSC   GUADELOUPE REGION, LEEWARD ISL

P: 24OCT2021 138129    18.0N   62.0W 3.0-5.3 ABBAA  Leeward Islands            

 

O: 24OCT2021 14:41:01  16.1N   97.9W mb=4.4  EMSC   OAXACA, MEXICO               

P: 22OCT2021 138137    18.0N   97.0W 3.5-5.5 ABAAA  Oaxaca, Mexico             

 

O: 24OCT2021 15:20:34  16.4N  100.2W ML=3.9  EMSC   OFFSHORE GUERRERO, MEXICO    

P: 20OCT2021 137871    16.0N  100.0W 3.5-5.3 BAAAA  Oaxaca, Mexico             

 

O: 25OCT2021 04:40:09  18.0N   66.9W ML=3.1  EMSC   PUERTO RICO

O: 25OCT2021 06:08:20  18.0N   67.0W Md=3.4  EMSC   PUERTO RICO REGION

O: 25OCT2021 06:18:25  18.0N   67.0W Md=3.3  EMSC   PUERTO RICO REGION

O: 24OCT2021 16:38:40  18.0N   67.1W Md=3.1  EMSC   PUERTO RICO                  

P: 25OCT2021 138139    18.0N   67.0W 3.4-5.1 AAAAA  Puerto Rico                

 

O: 24OCT2021 16:59:10  19.4N  102.1W ML=3.8  EMSC   MICHOACAN, MEXICO            

P: 24OCT2021 138133    18.0N  103.0W 3.5-5.3 ABAAA  Michoacan, Mexico          

 

O: 24OCT2021 20:25:11  19.6N   70.8W ML=3.2  EMSC   DOMINICAN REPUBLIC           

P: 16OCT2021 137874    19.0N   71.0W 3.4-4.9 CAAAA  Dominican Republic         

 

O: 24OCT2021 17:20:21  18.4N   73.5W ML=3.1  EMSC   HAITI REGION

O: 24OCT2021 16:38:17  18.8N   74.1W ML=3.3  EMSC   HAITI REGION                 

P: 14OCT2021 137874    19.0N   74.0W 3.4-4.9 DAAAA  Haiti                      

 

O: 24OCT2021 19:13:01  19.1N  103.9W ML=3.8  EMSC   COLIMA, MEXICO               

P: 24OCT2021 138133    18.0N  103.0W 3.5-5.3 AAAAA  Michoacan, Mexico          

 

O: 24OCT2021 16:52:35  24.3S   67.3W mb=4.2  EMSC   SALTA, ARGENTINA

O: 24OCT2021 18:09:11  24.1S   67.4W ML=4.3  EMSC   SALTA, ARGENTINA              

P: 22OCT2021 138313    23.0S   66.0W 4.0-5.5 ABBAA  Argentina                  

 

O: 24OCT2021 14:44:05  27.5N  111.5W ML=3.3  EMSC   GULF OF CALIFORNIA           

P: 23OCT2021 138145    25.0N  113.0W 3.5-5.2 ACBAA  Gulf of California         

 

O: 24OCT2021 17:29:29  44.9S   76.1W Mw=4.0  EMSC   OFF COAST OF AISEN, CHILE    

P: 14OCT2021 138077    43.0S   83.0W 4.0-5.8 CBCAA  Chile Rise                 

 

AFRICA AND EUROPE

 

O: 24OCT2021 14:26:20  10.2N   41.3E ML=5.0  EMSC   ETHIOPIA                      

P: 23OCT2021 138126    13.0N   41.0E 3.5-5.3 ACAAA  Ethiopia                   

 

O: 24OCT2021 17:15:15  28.6N   17.8W ML=4.1  EMSC   CANARY ISLANDS, SPAIN REGION 

P: 23OCT2021 138144    28.0N   18.0W 3.5-4.9 AAAAA  Canary Islands             

 

O: 24OCT2021 17:04:45  41.1N   43.9E mb=4.2  EMSC   ARMENIA                      

P: 24OCT2021 138224    40.0N   44.0E 3.5-5.3 ABAAA  Caucasus/Caspian Sea       

 

NEIC reported this earthquake of M 4.2 in Armenia was felt with intensity II-III in the area(s) of Armenia at Lernantsk (V) and Gyumri (IV) and II in Yerevan, Armenia. It was also felt lightly in Georgia, Turkey and Azerbaijan.

 

O: 24OCT2021 15:17:30  42.6N   46.1E mb=4.0  EMSC   CAUCASUS REGION, RUSSIA      

P: 22OCT2021 138224    43.0N   44.0E 3.5-5.4 AABAA  Caucasus/Caspian Sea       

 

No significant (M>=5) or unusual earthquakes were reported in Europe today.

 

SOUTHWEST PACIFIC

 

O: 25OCT2021 01:04:27  17.7S  178.7W mb=4.3  EMSC   FIJI REGION                  

P: 25OCT2021 138307    17.0S  179.0W 4.0-5.6 AAAAA  Tonga Islands              

 

O: 24OCT2021 19:47:09  22.0S  179.9W mb=4.5  EMSC   FIJI REGION                  

P: 19OCT2021 138068    22.0S  179.0W 4.0-5.6 BAAAA  Tonga Islands              

 

No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.

 

OCEAN RIDGES

 

O: 24OCT2021 17:47:52  86.3N   35.8E mb=4.8  EMSC   NORTH OF FRANZ JOSEF LAND    

 

O: 24OCT2021 14:56:38  57.3S   25.0W mb=4.8  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 24OCT2021 138341    58.0S   25.0W 4.0-5.9 AAAAA  So. Sandwich Islands       

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 24OCT2021 07:28:31  37.0S  176.9E ML=4.0  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 28OCT2021 138329    38.0S  178.0E 3.0-4.5 BAAAA  North Island, N.Z.          

 

O: 25OCT2021 03:38:48  29.8S  177.4W mb=4.9  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 24OCT2021 138332    31.0S  177.0W 4.0-5.4 ABAAA  So. Kermadec Islands       

P: 25OCT2021 138329    30.0S  179.0W 4.0-5.4 AAAAA  No. Kermadec Islands       

 

JAPAN AND KURIL ISLANDS

 

O: 25OCT2021 01:06:48  28.7N  138.2E mb=4.4  EMSC   BONIN ISLANDS, JAPAN REGION  

P: 31OCT2021 138143    28.0N  139.0E 4.0-5.6 CAAAA  Bonin Islands              

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 24OCT2021 09:03:18  31.1N  115.4W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO      

P: 24OCT2021 138200    30.9N  114.6W 2.5-4.8 AAAAA  So. California             

 

O: 24OCT2021 10:51:49  32.6N  115.5W Ml=2.2  EMSC   BAJA CALIFORNIA, MEXICO      

P: 26OCT2021 138201    32.9N  115.6W 2.5-4.8 AAAAA  So. California             

 

O: 25OCT2021 02:20:01  32.7N  117.6W ML=2.5  EMSC   CHANNEL ISLANDS REG., CALIFORN

P: 25OCT2021 138202    32.0N  117.4W 2.5-4.8 AAAAA  So. California             

 

NEIC reported this earthquake of M 2.8 in the Channel Islands, California was felt with intensity II-III in the area(s) of the Channel Islands, California at San Diego.

 

O: 25OCT2021 00:14:37  33.3N  116.1W Ml=2.4  EMSC   SOUTHERN CALIFORNIA          

P: 23OCT2021 138201    33.3N  115.8W 2.5-4.8 AAAAA  So. California             

 

O: 24OCT2021 14:11:10  34.0N  118.2W Ml=2.0  EMSC   GREATER LOS ANGELES AREA, CALIF.

O: 24OCT2021 14:01:01  34.0N  118.1W Mw=3.6  EMSC   GREATER LOS ANGELES AREA, CALI

P: 17OCT2021 137940    34.2N  117.8W 2.5-4.4 CAAAA  So. California             

P: 25OCT2021 138203    33.7N  117.5W 2.5-4.5 AAAAA  So. California             

 

O: 24OCT2021 07:08:56  36.5N  120.6W Md=2.3  EMSC   CENTRAL CALIFORNIA           

P: 25OCT2021 138171    36.6N  120.7W 2.5-4.7 AAAAA  Central California         

 

O: 24OCT2021 11:10:51  38.8N  122.8W Md=2.6  EMSC   NORTHERN CALIFORNIA          

P: 22OCT2021 138176    38.7N  122.7W 2.5-4.4 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.6 in the Geysers, California was felt with intensity II-III in the area(s) of the Geysers, California in Kelseyville and Geyserville.

 

O: 25OCT2021 01:57:40  40.9N  121.8W Md=2.2  EMSC   NORTHERN CALIFORNIA          

P: 27OCT2021 138242    40.4N  122.2W 2.5-4.8 AAAAA  Northern California        

 

 

ALASKA

 

No events of M>=3 were located in Alaska today.

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 24OCT2021 12:11:40  43.2N  126.5W mb=4.5  EMSC   OFF COAST OF OREGON          

P: 23OCT2021 138244    43.1N  126.5W 3.0-4.4 AAAAA  Off Coast of Oregon        

 

 

ROCKY MOUNTAINS REGION

 

O: 24OCT2021 14:26:21  31.6N  104.0W ML=2.9  EMSC   WESTERN TEXAS                

P: 24OCT2021 138199    32.6N  104.6W 2.0-3.9 AAAAA  SW U.S.A                   

 

O: 24OCT2021 07:07:51  38.2N  112.7W ML=3.2  EMSC   UTAH                         

P: 25OCT2021 138217    38.7N  112.6W 2.0-4.1 AAAAA  Utah area                  

 

NEIC reported this earthquake of M 3.3 in Utah was felt with intensity II-III in the area(s) of Utah in Beaver, Saint George.

 

EASTERN U.S./CANADA

 

O: 24OCT2021 17:55:10  35.5N   84.0W mb=2.7  EMSC   EASTERN TENNESSEE            

P: 24OCT2021 138183    35.9N   82.8W 2.0-4.1 AAAAA  Kentucky/Tennessee/NC      

P: 31OCT2021 138183    35.0N   84.0W 2.0-3.9 CAAAA  Kentucky/Tennessee/NC      

 

O: 24OCT2021 22:33:12  37.7N   97.3W mb=2.5  EMSC   KANSAS                       

P: 23OCT2021 138213    38.0N   98.0W 2.0-4.3 AAAAA  Southern Plains            

 

NEIC reported this earthquake of M 2.5 in Wichita, Kansas was felt with intensity II-III in the area(s) of Wichita, Kansas.

 

O: 24OCT2021 21:43:25  47.0N   66.6W ML=2.2  EMSC   NEW BRUNSWICK, CANADA        

P: 22OCT2021 138225    46.0N   66.0W 2.0-4.0 AAAAA  E. of Maine                

 

HAWAII

 

O: 24OCT2021 18:15:43  19.2N  155.5W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII     

P: 23OCT2021 138128    18.8N  155.2W 3.0-4.8 AAAAA  Hawaii                     

 

STRONG EARTHQUAKE SHAKES NORTHERN TAIWAN

 

EARTHQUAKE SUMMARY FOR OCTOBER 23, 2021

 

A strong earthquake of M 6.2-6.5 was widely felt in northern Taiwan today. NEIC reported maximum intensity shaking of VII in Ilan, Taiwan; V in Taipei, Keelung Counties. CWB reported intensity IV in Yilan, Hualien, Taipei, Taoyuan, Taipei, Taichung, Nantou, Hsinchu, Keelung, Miaoli, Changhua, III in Yunlin, Taitung, Chiayi, Kaohsiung, and II in Tainan, Pingtung, Penghu and Lienchiang Counties, Taiwan. There were no immediate reports of damage or injuries associated with this earthquake. An aftershock of M 5.4 was recorded about a minute after the mainshock. A foreshock of M 5.3 hit the region yesterday and was reported in this summary as:

 

 

"A moderate earthquake of M 5.1-5.3 was also widely felt in Taiwan today.  NEIC reported this earthquake of M 5.1 in Taiwan was felt with intensity II-III in the area(s) of Taiwan in Ilan, Taichung, Taipei, Tainan, and IV in Hualien, and Nantou. CWB reported this earthquake was felt with intensity IV in Hualien, III in Yilan, Nantou, Taichung; II in Hsinchu, Yunlin, Chiayi, I in Taoyuan, Taipei, Taitung, Changhua and Tainan Counties, Taiwan. This earthquake, like that in Micronesia was likely triggered by high tidal stresses associated with the full moon. It occurred within about one hour of local solar noon, a time when tidal stresses maximize. Further seismic enhancement is likely in Taiwan in the next several days. Forecast 138157 had expected this event within about 100 km was likely around October 25." (October 22-23, 2021)

 

The mainshock today occurred near local solar noon and was probably promoted by high tidal stresses which maximize near this hour. It also occurred near the longitude of maximum tidal stress with the full moon as noted in previous issues of this summary:

 

"The full moon arrived on October 20 at 14:57 UT. Longitudes which were sub-solar (local solar noon) at this time are near 45 West while those which are anti-solar (local solar mid-night) are near 135 East. In the west these include areas of the northern Mid-Atlantic and the Caribbean while in the east most of the subduction zone from eastern Indonesia north to Japan and the Kuril Islands are included. These are the longitudes where enhanced seismicity with this full moon are most likely. A geomagnetic storm is likely to favor seismicity in the region of Indonesia and at higher latitudes with major events most likely around local solar noon and midnight. The likelihood of a major earthquake in the next week (October 18-24, 2021), as estimated by this summary, is moderate." (October 20-23, 2021)

 

NEIC data suggests this is the strongest earthquake in the region of Taiwan in the past three years - since an M 6.4 on February 6, 2018. The last earthquake listed in NEIC data with M>=6.5 was an M 6.5 on April 26, 2010.  This epicenter is at the third node (120 degrees) from the M 7.1 in Mexico of September 8, 2021 and may have been promoted by energy from that source. Forecasts 138157 and 139158 had expected today's activity within about 100 km was likely around October 24-28.

 

O: 23OCT2021 10:32:38  24.1N  121.7E ML=4.5  EMSC   TAIWAN

O: 24OCT2021 04:38:52  24.1N  121.6E ML=4.5  EMSC   TAIWAN

O: 24OCT2021 05:12:42  24.6N  121.7E ML=5.4  EMSC   TAIWAN

O: 23OCT2021 03:16:03  24.1N  121.8E mb=5.1  EMSC   TAIWAN                       

O: 23OCT2021 03:16:04  24.1N  121.7E ML=5.3  TAI    Hualien, Taiwan              

O: 24OCT2021 05:11:34  24.5N  121.9E Mw=6.2  EMSC   TAIWAN                       

O: 24OCT2021 05:11:34  24.5N  121.7E ML=6.5  TAI    Hualien, Taiwan              

P: 28OCT2021 138158    24.0N  123.0E 4.0-5.5 BAAAA  Taiwan                     

P: 24OCT2021 138158    24.0N  124.0E 4.0-5.4 AABAA  Taiwan                     

P: 25OCT2021 138157    23.0N  122.0E 4.0-5.4 ABAAA  Taiwan                     

 

The strong eruption of Cumbre Viejo, La Palma, Canary Islands continued today. More than  2100 structures have been destroyed in the current eruption which has also displaced nearly 8000 residents. To this point no one has died due to the eruption. This eruption has seen earthquakes of increasing magnitude over the course of the eruption which began in mid-September. An earthquake of M 4.7 in the region today was the largest in the area within about 100 km of La Palma in at least 30 years. More recently an M 4.8 occurred about 250 km to the southwest of this on September 26, 2019 and about 150 km southwest of today's epicenter on December 27, 2013. Forecast 138144 had expected today's activity was likely within about 50 km around October 23.

 

O: 23OCT2021 07:28:25  28.7N   17.8W ML=4.1  EMSC   CANARY ISLANDS, SPAIN REGION

O: 23OCT2021 15:34:47  28.6N   17.8W ML=4.7  EMSC   CANARY ISLANDS, SPAIN REGION 

P: 23OCT2021 138144    28.0N   18.0W 3.5-4.9 AAAAA  Canary Islands              

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 23OCT2021 10:32:38  24.1N  121.7E ML=4.5  EMSC   TAIWAN

O: 24OCT2021 04:38:52  24.1N  121.6E ML=4.5  EMSC   TAIWAN

O: 24OCT2021 05:12:42  24.6N  121.7E ML=5.4  EMSC   TAIWAN

O: 24OCT2021 05:11:34  24.5N  121.9E Mw=6.2  EMSC   TAIWAN                       

P: 24OCT2021 138158    24.0N  124.0E 4.0-5.4 AABAA  Taiwan                     

P: 25OCT2021 138157    23.0N  122.0E 4.0-5.4 ABAAA  Taiwan                     

P: 28OCT2021 138158    24.0N  123.0E 4.0-5.5 BAAAA  Taiwan                     

 

O: 23OCT2021 19:57:13  39.6N   71.2E mb=4.2  EMSC   KYRGYZSTAN                   

P: 25OCT2021 138230    41.0N   73.0E 4.0-5.4 ABBAA  Kirgizstan/Xinjiang        

P: 28OCT2021 138182    38.0N   72.0E 3.8-5.4 BBAAA  Hindu Kush/Pakistan        

 

O: 24OCT2021 05:59:08  35.9N   75.0E ML=4.2  EMSC   NORTHWESTERN KASHMIR         

P: 28OCT2021 138195    35.0N   75.0E 3.8-5.3 BAAAA  Northern India             

 

O: 23OCT2021 14:16:03  51.1N   98.1E mb=4.2  EMSC   RUSSIA-MONGOLIA BORDER REGION

P: 29OCT2021 138276    51.0N   98.0E 3.0-4.7 CAAAA  So. Siberia                

 

O: 23OCT2021 08:33:30  18.8N   79.4E ML=4.0  EMSC   ANDHRA PRADESH, INDIA        

 

INDONESIA AND PHILIPPINES

 

O: 24OCT2021 05:28:10   1.3N  122.5E ML=4.2  EMSC   MINAHASA, SULAWESI, INDONESIA

O: 23OCT2021 13:25:41   1.0N  122.0E ML=4.1  EMSC   MINAHASA, SULAWESI, INDONESIA

P: 25OCT2021 138095     1.0N  124.0E 4.0-5.4 AABAA  Mindanao, Philippines      

 

O: 24OCT2021 03:22:09   1.7N  126.6E mb=4.8  EMSC   MOLUCCA SEA                  

P: 25OCT2021 138094     2.0N  129.0E 4.0-5.6 AACAA  Halmahera                  

 

O: 24OCT2021 01:30:21   2.6S  128.9E ML=4.2  EMSC   CERAM SEA, INDONESIA         

P: 27OCT2021 138101     3.0S  128.0E 4.0-5.4 BAAAA  Ceram area                 

 

O: 24OCT2021 00:24:03   2.8S  122.1E ML=4.6  EMSC   SULAWESI, INDONESIA          

P: 23OCT2021 138115     1.0S  123.0E 4.0-5.6 ABAAA  Sulawesi area              

 

O: 23OCT2021 23:34:26   4.7S  102.1E mb=4.9  EMSC   SOUTHERN SUMATRA, INDONESIA  

P: 27OCT2021 138114     6.0S  103.0E 4.0-5.6 BBAAA  So. of Sumatera            

 

O: 23OCT2021 10:32:42   7.0S  129.9E mb=4.5  EMSC   BANDA SEA

O: 23OCT2021 07:12:58   6.0S  129.1E mb=4.3  EMSC   BANDA SEA                    

P: 22OCT2021 138118     6.0S  130.0E 4.0-5.5 AAAAA  West Irian, PNG            

 

O: 23OCT2021 23:08:33   8.5N  127.0E mb=5.0  EMSC   PHILIPPINE ISLANDS REGION    

P: 24OCT2021 138094     8.0N  127.0E 4.0-5.4 AAAAA  Halmahera                  

 

NEIC reported this earthquake of M 5.0 in Caraga, Philippines was felt with intensity II-III in the area(s) of Caraga, Philippines at Barcelona (VI), Hinatuan (IV) and Tandag.

 

O: 23OCT2021 14:58:15   9.8S  118.9E mb=4.1  EMSC   SUMBAWA REGION, INDONESIA    

P: 26OCT2021 138304    11.0S  118.0E 4.0-5.6 BBAAA  So. of Indonesia           

 

 

CENTRAL AND SOUTH AMERICA

 

O: 24OCT2021 03:07:03  14.5N   93.8W ML=4.1  EMSC   OFF COAST OF CHIAPAS, MEXICO 

P: 26OCT2021 138124    16.0N   93.0W 3.5-5.1 ABAAA  Chiapas, Mexico            

 

O: 23OCT2021 16:34:53  16.1S   74.0W ML=4.0  EMSC   NEAR COAST OF SOUTHERN PERU  

P: 22OCT2021 138302    16.0S   74.0W 4.0-5.4 AAAAA  So. Peru/Bolivia           

 

O: 24OCT2021 06:33:37  16.7N   95.1W ML=4.0  EMSC   OAXACA, MEXICO               

P: 27OCT2021 138124    16.0N   95.0W 3.5-5.2 BAAAA  Chiapas, Mexico            

 

O: 23OCT2021 22:47:26  17.3N   62.1W mb=4.6  EMSC   ANTIGUA AND BARBUDA REGION   

P: 24OCT2021 138129    18.0N   62.0W 3.0-5.3 AAAAA  Leeward Islands            

 

O: 23OCT2021 21:28:36  16.9N   94.4W ML=4.0  EMSC   OAXACA, MEXICO

O: 24OCT2021 05:06:17  17.3N   92.1W ML=4.0  EMSC   CHIAPAS, MEXICO              

P: 26OCT2021 138124    16.0N   93.0W 3.5-5.1 AAAAA  Chiapas, Mexico            

 

O: 24OCT2021 05:57:00  18.3N   68.4W Md=3.3  EMSC   MONA PASSAGE, DOMINICAN REPUBL

P: 25OCT2021 138139    18.0N   67.0W 3.4-5.1 AABAA  Puerto Rico                

 

O: 23OCT2021 09:09:47  18.3N   72.1W ML=3.0  EMSC   HAITI REGION                 

P: 16OCT2021 137874    19.0N   71.0W 3.4-4.9 CAAAA  Dominican Republic         

 

O: 23OCT2021 22:04:51  18.6N   67.1W Md=3.1  EMSC   PUERTO RICO REGION

O: 23OCT2021 14:16:06  18.6N   66.2W Md=3.1  EMSC   PUERTO RICO REGION           

P: 25OCT2021 138139    18.0N   67.0W 3.4-5.1 AAAAA  Puerto Rico                

 

O: 23OCT2021 07:56:41  18.5N   73.9W ML=3.3  EMSC   HAITI REGION

O: 24OCT2021 04:59:17  18.8N   74.1W mb=4.1  EMSC   HAITI REGION

O: 23OCT2021 11:16:34  18.8N   74.0W ML=3.4  EMSC   HAITI REGION                 

P: 14OCT2021 137874    19.0N   74.0W 3.4-4.9 CAAAA  Haiti                      

 

O: 23OCT2021 18:25:35  19.3N   96.3W ML=4.0  EMSC   VERACRUZ, MEXICO             

P: 22OCT2021 138137    18.0N   97.0W 3.5-5.5 ABAAA  Oaxaca, Mexico             

 

O: 23OCT2021 19:43:39  22.1S   68.7W mb=4.1  EMSC   ANTOFAGASTA, CHILE           

P: 19OCT2021 138060    23.0S   69.0W 4.0-5.4 BAAAA  Coast No. Chile            

 

O: 23OCT2021 08:21:42  24.2S   67.1W mb=4.8  EMSC   SALTA, ARGENTINA             

P: 22OCT2021 138313    23.0S   66.0W 4.0-5.5 ABAAA  Argentina                  

 

O: 23OCT2021 20:18:17  27.3N  111.4W ML=3.7  EMSC   GULF OF CALIFORNIA           

P: 13OCT2021 137881    28.0N  112.0W 3.5-4.9 CAAAA  Gulf of California         

 

 

AFRICA AND EUROPE

 

O: 23OCT2021 07:28:25  28.7N   17.8W ML=4.1  EMSC   CANARY ISLANDS, SPAIN REGION

O: 23OCT2021 15:34:47  28.6N   17.8W ML=4.7  EMSC   CANARY ISLANDS, SPAIN REGION 

P: 23OCT2021 138144    28.0N   18.0W 3.5-4.9 AAAAA  Canary Islands             

 

SOUTHWEST PACIFIC

 

No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.

 

OCEAN RIDGES

 

O: 23OCT2021 14:17:52  37.5S   50.9E Mw=4.9  EMSC   SOUTHWEST INDIAN RIDGE       

P: 15OCT2021 138075    34.0S   55.0E 4.0-5.8 CCCAA  So. Indian Ocean           

 

O: 23OCT2021 08:00:47  57.5S   25.6W mb=5.0  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 24OCT2021 138341    58.0S   25.0W 4.0-5.9 AAAAA  So. Sandwich Islands       

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 23OCT2021 16:28:41  37.7S  179.7E ML=4.2  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 28OCT2021 138329    38.0S  178.0E 3.0-4.5 BABAA  North Island, N.Z.         

 

JAPAN AND KURIL ISLANDS

 

No earthquakes of M>=4 were located in Japan or the Kuril Islands today.

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

 

O: 23OCT2021 07:55:33  31.4N  115.5W ML=3.3  EMSC   BAJA CALIFORNIA, MEXICO       

P: 24OCT2021 138200    30.9N  114.6W 2.5-4.8 AAAAA  So. California             

 

O: 23OCT2021 11:27:14  32.0N  117.6W ML=2.8  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P: 25OCT2021 138202    32.0N  117.4W 2.5-4.8 AAAAA  So. California             

 

O: 24OCT2021 06:49:11  33.0N  115.9W ML=3.2  EMSC   SOUTHERN CALIFORNIA

O: 24OCT2021 06:49:11  33.0N  115.9W ML=3.6  ANSS   SOUTHERN CALIFORNIA

O: 23OCT2021 16:12:50  33.2N  116.0W ML=2.5  EMSC   SOUTHERN CALIFORNIA

O: 23OCT2021 13:22:33  32.9N  115.5W Ml=2.3  EMSC   SOUTHERN CALIFORNIA          

P: 23OCT2021 138201    33.3N  115.8W 2.5-4.8 AAAAA  So. California             

P: 26OCT2021 138201    32.9N  115.6W 2.5-4.8 BAAAA  So. California             

 

NEIC reported this earthquake of M 3.6 in Southern California was felt with intensity II-III in the area(s) of Southern California in Imperial, El Centro, Calexico, Mexicali.

 

O: 23OCT2021 21:24:47  34.1N  117.3W Ml=2.0  EMSC   GREATER LOS ANGELES AREA, CALI

P: 25OCT2021 138203    33.7N  117.5W 2.5-4.5 AAAAA  So. California             

P: 28OCT2021 138203    34.1N  117.4W 2.5-4.6 BAAAA  So. California             

 

O: 23OCT2021 16:28:35  37.0N  121.6W Md=2.3  EMSC   NORTHERN CALIFORNIA          

P: 25OCT2021 138172    37.1N  121.5W 2.5-4.6 AAAAA  Central California         

 

O: 23OCT2021 12:30:17  37.6N  118.7W Md=2.2  EMSC   CENTRAL CALIFORNIA           

P: 25OCT2021 138167    37.8N  118.2W 2.5-4.7 AAAAA  California/Nevada area     

P: 27OCT2021 138165    37.4N  118.6W 2.5-4.6 CAAAA  California/Nevada area     

 

O: 23OCT2021 15:36:45  38.0N  122.3W Md=2.1  EMSC   SAN FRANCISCO BAY AREA, CALIF.

O: 23OCT2021 13:34:44  38.0N  122.3W ML=2.5  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 22OCT2021 138175    37.9N  122.0W 2.5-4.6 AAAAA  Central California          

P: 26OCT2021 138175    38.0N  122.3W 2.5-4.6 BAAAA  Central California         

 

NEIC reported this earthquake of M 2.8 in San Francisco Bay, California was felt with intensity II-III in the area(s) of San Francisco Bay, California at Hercules, Pinole, Rodeo, El Sobrante, Crockett, Marginez, Richmond, San Pablo, El Cerrito, Berkeley.

 

O: 23OCT2021 21:12:54  38.2N  117.9W ml=2.5  EMSC   NEVADA                       

P: 25OCT2021 138167    37.8N  118.2W 2.5-4.7 AAAAA  California/Nevada area     

 

O: 23OCT2021 21:46:28  39.6N  120.3W ML=3.2  EMSC   NORTHERN CALIFORNIA          

P: 22OCT2021 138169    39.3N  120.0W 2.5-4.6 AAAAA  California/Nevada area     

 

NEIC reported this earthquake of M 3.3 in Loyalton, northern California was felt with intensity II-III in the area(s) of Loyalton, northern California at Sierraville, Loyalton, Truckee, Chicoot, Norden, Nevada City, Foresthill, Grass Valley and in Reno, Nevada.

 

O: 24OCT2021 03:53:39  38.8N  122.9W Md=2.8  EMSC   NORTHERN CALIFORNIA

O: 24OCT2021 04:09:22  38.8N  122.9W Md=2.6  EMSC   NORTHERN CALIFORNIA

O: 24OCT2021 02:57:36  38.8N  122.9W Md=2.1  EMSC   NORTHERN CALIFORNIA          

P: 22OCT2021 138176    38.7N  122.7W 2.5-4.4 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.8 in the Geysers, California was felt with intensity II-III in the area(s) of the Geysers, California at Hopland and Guerneville.

 

ALASKA

 

O: 23OCT2021 23:02:31  56.3N  156.5W ML=3.5  EMSC   ALASKA PENINSULA             

P: 24OCT2021 138264    57.0N  156.6W 3.5-4.9 AAAAA  Alaska Peninsula           

 

O: 24OCT2021 05:33:51  59.7N  153.0W ML=3.3  EMSC   SOUTHERN ALASKA              

P: 25OCT2021 138282    60.2N  153.2W 3.2-5.3 AAAAA  Central Alaska             

 

O: 24OCT2021 03:51:42  64.4N  146.7W ML=3.5  EMSC   CENTRAL ALASKA               

P: 27OCT2021 138285    63.2N  145.5W 3.2-5.3 BBAAA  Central Alaska             

 

NEIC reported this earthquake of M 3.3 in Central Alaska was felt with intensity II-III in the area(s) of Central Alaska at Eielson AFB, North Pole and Delta Junction.

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 23OCT2021 09:10:58  42.3N  126.2W ML=3.2  EMSC   OFF COAST OF OREGON

O: 23OCT2021 15:59:37  42.2N  126.6W ML=3.1  EMSC   OFF COAST OF OREGON          

P: 23OCT2021 138244    43.1N  126.5W 3.0-4.4 AAAAA  Off Coast of Oregon        

 

NEIC reported this earthquake of M 3.2 off the coast of Oregon was felt with intensity II-III in the area(s) of Oregon at Gold Beach, Eugene, Corvallis.

 

ROCKY MOUNTAINS REGION

 

O: 23OCT2021 08:00:22  31.6N  104.4W ML=2.6  EMSC   WESTERN TEXAS                

P: 24OCT2021 138199    32.6N  104.6W 2.0-3.9 AAAAA  SW U.S.A                   

 

O: 24OCT2021 03:37:05  47.9N  114.0W Ml=2.7  EMSC   WESTERN MONTANA              

P: 17OCT2021 137984    48.0N  115.0W 2.0-3.9 CAAAA  Montana/Idaho              

 

NEIC reported this earthquake of M 2.5 in Western Montana was felt with intensity II-III in the area(s) of Western Montana at Bigfork and Polson.

 

EASTERN U.S./CANADA

 

No earthquakes of M>=1 were located in the Eastern U.S. or Canada today.

 

HAWAII

 

O: 23OCT2021 15:23:51  19.4N  155.5W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII     

P: 23OCT2021 138128    18.8N  155.2W 3.0-4.8 AAAAA  Hawaii                     

 

NEIC reported this earthquake of M 3.2 in Hawaii was felt with intensity II-III in the area(s) of Hawaii in Captain Cook, Hilo, Naalehu, Holualoa and Kailua Kona.

 

UNUSUAL QUAKE IN MICRONESIA LIKELY TIDALLY TRIGGERED

 

EARTHQUAKE SUMMARY FOR OCTOBER 22, 2021

 

 

An unusual earthquake of M 5.4 in Micronesia was the largest earthquake in the world today. NEIC reported light intensity in Micronesia at Polowat and Chuuk.

The last earthquake within about 400 km of this epicenter of M>=5.4 was an M 5.6 on November 11, 2015 but no such earthquakes have hit within about 200 km in at least 30 years. This epicenter is located near the longitude of maximum tidal stress with the recent full moon as noted in previous issues of this summary:

 

"The full moon arrived on October 20 at 14:57 UT. Longitudes which were sub-solar (local solar noon) at this time are near 45 West while those which are anti-solar (local solar mid-night) are near 135 East. In the west these include areas of the northern Mid-Atlantic and the Caribbean while in the east most of the subduction zone from eastern Indonesia north to Japan and the Kuril Islands are included. These are the longitudes where enhanced seismicity with this full moon are most likely. A geomagnetic storm is likely to favor seismicity in the region of Indonesia and at higher latitudes with major events most likely around local solar noon and midnight. The likelihood of a major earthquake in the next week (October 18-24, 2021), as estimated by this summary, is moderate." (October 20-23, 2021)

 

O: 22OCT2021 07:27:53   4.4N  147.2E Mw=5.4  EMSC   FED. STATES OF MICRONESIA REGI

 

A moderate earthquake of M 5.1-5.3 was also widely felt in Taiwan today.

NEIC reported this earthquake of M 5.1 in Taiwan was felt with intensity II-III in the area(s) of Taiwan in Ilan, Taichung, Taipei, Tainan, and IV in Hualien, and Nantou. CWB reported this earthquake was felt with intensity IV in Hualien, III in Yilan, Nantou, Taichung; II in Hsinchu, Yunlin, Chiayi, I in Taoyuan, Taipei, Taitung, Changhua and Tainan Counties, Taiwan. This earthquake, like that in Micronesia was likely triggered by high tidal stresses associated with the full moon. It occurred within about one hour of local solar noon, a time when tidal stresses maximize. Further seismic enhancement is likely in Taiwan in the next several days. Forecast 138157 had expected this event within about 100 km was likely around October 25.

 

O: 23OCT2021 03:16:03  24.1N  121.8E mb=5.1  EMSC   TAIWAN                       

O: 23OCT2021 03:16:04  24.1N  121.7E ML=5.3  TAI    Hualien, Taiwan              

P: 25OCT2021 138157    23.0N  122.0E 4.0-5.4 AAAAA  Taiwan                     

 

The strongest earthquake in the U.S. or Canada today was an M 5.1 in the Rat Islands, Aleutians, Alaska. NEIC reported it was felt with intensity II in Adak, Alaska. The last earthquake in the Rat Islands within about 150 km of this epicenter occurred on July 11, 2021 with M 5.3 and 5.1. The only other such event in the Rat Islands in the past two years occurred on May 17, 2021 with M 5.4. Forecast 138274 had expected today's event with in about 50 km was likely around October 27.

 

O: 23OCT2021 03:10:03  51.6N  178.8E mb=5.1  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 27OCT2021 138274    51.0N  179.0E 4.0-5.6 BAAAA  Rat Islands                

 

The strongest earthquake felt outside Alaska in the U.S. today was an M 3.5-3.7 off the coast of Baja California. NEIC reported this earthquake of M 3.6 off the coast of Baja California  was felt with intensity II-III in the area(s) of California in Imperial Beach, Coronado, San Diego, La Mesa, La Jolla. This is the strongest earthquake within about 100 km of this epicenter since an M 4.2 more than two years ago on June 5, 2019. Forecast 138202 had expected this activity was likely within about 50 km around October 25. 

 

O: 23OCT2021 02:56:32  31.9N  117.9W ML=3.5  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

O: 23OCT2021 02:56:32  31.9N  117.9W ML=3.7  ANSS   OFFSHORE BAJA CALIFORNIA, MEXI

P: 25OCT2021 138202    32.0N  117.4W 2.5-4.8 AAAAA  So. California             

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 23OCT2021 03:16:03  24.1N  121.8E mb=5.1  EMSC   TAIWAN                       

O: 23OCT2021 03:16:04  24.1N  121.7E ML=5.3  TAI    Hualien, Taiwan              

P: 25OCT2021 138157    23.0N  122.0E 4.0-5.4 ABAAA  Taiwan                     

 

O: 22OCT2021 20:58:09  29.1N   67.6E mb=4.2  EMSC   PAKISTAN                     

P: 19OCT2021 137908    30.0N   68.0E 3.8-5.8 BAAAA  Hindu Kush/Pakistan        

 

O: 22OCT2021 23:03:13  51.4N   90.7E Mw=5.1  EMSC   SOUTHWESTERN SIBERIA, RUSSIA 

P: 14OCT2021 137981    46.0N   96.0E 4.0-5.6 CCCAA  Mongolia                   

 

NEIC reported this earthquake of M 5.1 in Siberia, Russia was felt with intensity II-III in the area(s) of Siberia, Russia at Kyzyl-Mazhalyk.

 

INDONESIA AND PHILIPPINES

 

O: 22OCT2021 17:01:13   2.3S  100.8E mb=4.3  EMSC   KEP. MENTAWAI REGION, INDONESI

P: 27OCT2021 138114     2.0S  101.0E 4.0-5.5 BAAAA  So. of Sumatera            

 

O: 22OCT2021 20:51:43   4.1S  136.4E ML=4.0  EMSC   NEAR S COAST OF PAPUA, INDONES

P: 29OCT2021 138117     4.0S  136.0E 4.0-5.6 CAAAA  West Irian, PNG            

 

O: 22OCT2021 07:27:53   4.4N  147.2E Mw=5.4  EMSC   FED. STATES OF MICRONESIA REGI

 

O: 23OCT2021 01:16:13   9.5S  118.5E ML=4.3  EMSC   SUMBAWA REGION, INDONESIA    

P: 26OCT2021 138304    11.0S  118.0E 4.0-5.6 BBAAA  So. of Indonesia           

 

O: 22OCT2021 19:44:49  13.7N  123.1E ML=4.2  EMSC   LUZON, PHILIPPINES           

P: 24OCT2021 138131    14.0N  121.0E 3.5-5.0 AABAA  Luzon, Philippines         

 

O: 22OCT2021 17:52:51  18.1N  145.4E mb=4.3  EMSC   PAGAN REG., N. MARIANA ISLANDS

P: 13OCT2021 137892    20.0N  146.0E 4.0-5.4 CBAAA  Volcano Islands            

 

 

CENTRAL AND SOUTH AMERICA

 

 

O: 22OCT2021 18:06:25  11.1S   74.7W ML=4.2  EMSC   CENTRAL PERU                 

P: 27OCT2021 138297    11.0S   74.0W 4.0-5.9 BAAAA  Central Peru               

 

O: 23OCT2021 04:20:41  15.7S   72.0W ML=4.0  EMSC   SOUTHERN PERU                

P: 26OCT2021 138297    14.0S   73.0W 4.0-5.5 BBAAA  Central Peru               

 

O: 22OCT2021 18:38:59  15.9N   94.9W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

P: 27OCT2021 138124    16.0N   95.0W 3.5-5.2 BAAAA  Chiapas, Mexico            

 

O: 22OCT2021 22:20:58  18.3N   67.7W Md=3.2  EMSC   MONA PASSAGE, PUERTO RICO    

P: 22OCT2021 138139    18.0N   68.0W 3.4-5.1 AAAAA  Puerto Rico                

 

NEIC reported this earthquake of M 3.7 north of Puerto Rico  was felt with intensity II-III in the area(s) of Puerto Rico in Toa Baja and Morovis.

 

O: 22OCT2021 20:39:42  18.3N   72.0W ML=3.0  EMSC   HAITI REGION                 

O: 22OCT2021 17:14:15  18.8N   74.0W ML=3.6  EMSC   HAITI REGION                 

P: 14OCT2021 137874    19.0N   74.0W 3.4-4.9 CAAAA  Haiti                       

 

O: 22OCT2021 11:14:50  22.2S   69.1W mb=4.4  EMSC   ANTOFAGASTA, CHILE           

P: 19OCT2021 138060    23.0S   69.0W 4.0-5.4 BAAAA  Coast No. Chile            

 

NEIC reported this earthquake of M 4.4 in Calama, Antofagasta, Chile was felt with intensity II-III in the area(s) of Calama, Antofagasta, Chile.

 

O: 23OCT2021 02:13:56  33.2S   71.7W mb=5.0  EMSC   VALPARAISO, CHILE            

P: 24OCT2021 138326    33.0S   71.0W 4.0-5.9 AAAAA  Central Chile              

 

NEIC reported this earthquake of M 5.0 in Valparaiso, Chile was felt with intensity II-III in the area(s) of Valparaiso, Chile with VI in Valparaiso and Quilpue; V in Vina del Mar, IV in San Antonio, La Ligua and II-III in Villa Alemana, Calera, Lampa, Penaflor and San Bernardo.

 

O: 23OCT2021 01:45:27  36.9S   72.8W mb=4.7  EMSC   BIO-BIO, CHILE               

P: 29OCT2021 138327    37.0S   74.0W 4.0-5.6 CAAAA  Central Chile              

 

NEIC reported this earthquake of M 4.7 in Biobio, Chile was felt with intensity II-III in the area(s) of Biobio, Chile with VI in Concepcion, Talcahuano, Los Angeles, Chillan, Angol, Araucania; III in Chiguayante, Penco,  Coronel, Arauco, and Curanilahue.

 

 

AFRICA AND EUROPE

 

O: 23OCT2021 06:07:00  28.6N   17.8W ML=3.9  EMSC   CANARY ISLANDS, SPAIN REGION

O: 23OCT2021 00:22:27  28.3N   17.5W ML=3.9  EMSC   CANARY ISLANDS, SPAIN REGION 

P: 23OCT2021 138144    28.0N   18.0W 3.5-4.9 AAAAA  Canary Islands             

 

O: 22OCT2021 17:12:50  35.2N   25.3E mb=4.3  EMSC   CRETE, GREECE

O: 22OCT2021 10:11:31  35.1N   25.2E ML=4.4  EMSC   CRETE, GREECE                

P: 24OCT2021 138160    35.0N   25.0E 3.0-4.6 AAAAA  Aegean Sea                 

 

NEIC reported this earthquake of M 4.3 and M 4.5 in Crete, Greece was felt with intensity II-III in the area(s) of Crete, Greece with V in Anoyia and Arkalokhorion; IV in Glavinica, Bulgaria and Nea Alikarnassos, Greece and II-III in Koutouloufarion and Khanion tou, Limin and Gazion, Iraklion.

 

O: 23OCT2021 01:17:19  38.8N   20.6E mb=4.1  EMSC   GREECE                        

P: 24OCT2021 138190    38.0N   20.0E 3.0-4.5 AAAAA  No. Greece                 

 

NEIC reported this earthquake of M 4.1 in Levkas, Greece was felt with intensity II-III in the area(s) of Levkas, Greece at Karia, Leukas and Nidrion.

 

SOUTHWEST PACIFIC

 

O: 22OCT2021 21:59:48  16.9S  174.1W mb=5.0  EMSC   TONGA                        

P: 23OCT2021 138306    16.0S  174.0W 4.0-5.4 AAAAA  Tonga Islands              

 

O: 22OCT2021 08:28:53  26.0S  178.5E mb=4.3  EMSC   SOUTH OF FIJI ISLANDS         

P: 26OCT2021 138325    25.0S  179.0E 4.0-5.5 BAAAA  Tonga/Fiji                 

 

O: 22OCT2021 14:21:02  18.8S  177.6W mb=4.5  EMSC   FIJI REGION                  

P: 24OCT2021 138308    19.0S  176.0W 4.0-5.6 AABAA  Tonga Islands              

 

OCEAN RIDGES

 

O: 23OCT2021 00:34:17  56.3S   27.9W Mw=5.2  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 25OCT2021 138341    55.0S   29.0W 4.0-5.9 ABAAA  So. Sandwich Islands       

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 22OCT2021 15:43:26  31.8S  179.1E ML=4.1  EMSC   KERMADEC ISLANDS REGION      

P: 27OCT2021 138333    31.0S  180.0E 4.0-5.4 BAAAA  So. Kermadec Islands       

 

O: 23OCT2021 06:51:53  35.1S  179.7E ML=4.2  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 24OCT2021 138333    33.0S  178.0E 4.0-5.6 ACBAA  So. Kermadec Islands       

 

JAPAN AND KURIL ISLANDS

 

 

O: 23OCT2021 06:50:30  35.5N  138.9E ML=4.0  EMSC   EASTERN HONSHU, JAPAN        

P: 26OCT2021 138191    35.0N  139.0E 3.5-5.0 BAAAA  No. Honshu, Japan          

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 22OCT2021 09:42:53  29.5N  116.3W ML=3.8  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P: 17OCT2021 137929    31.9N  116.3W 2.5-4.7 BCAAA  So. California             

 

O: 22OCT2021 09:56:02  29.8N  113.9W ML=3.7  EMSC   GULF OF CALIFORNIA            

P: 24OCT2021 138200    30.9N  114.6W 2.5-4.8 ABAAA  So. California             

 

O: 23OCT2021 02:56:32  31.9N  117.9W ML=3.5  EMSC   OFFSHORE BAJA CALIFORNIA, MEXI

P: 25OCT2021 138202    32.0N  117.4W 2.5-4.8 AAAAA  So. California             

 

O: 23OCT2021 06:54:53  36.5N  118.0W Ml=2.1  EMSC   CENTRAL CALIFORNIA           

P: 23OCT2021 138164    36.9N  117.4W 2.5-4.7 AAAAA  California/Nevada area     

 

O: 22OCT2021 21:14:19  37.6N  118.8W ML=3.1  EMSC   CENTRAL CALIFORNIA           

O: 22OCT2021 21:14:19  37.6N  118.8W ML=3.5  ANSS   CENTRAL CALIFORNIA           

P: 24OCT2021 138165    37.3N  118.3W 2.5-4.6 AAAAA  California/Nevada area     

P: 27OCT2021 138165    37.4N  118.6W 2.5-4.6 BAAAA  California/Nevada area     

 

NEIC reported this earthquake of M 3.5 in Mammoth Lakes, California was felt with intensity II-III in the area(s) of Mammoth Lakes, California at Benton and Bishop.

 

O: 22OCT2021 14:52:56  38.0N  122.3W Md=2.1  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 22OCT2021 138175    37.9N  122.0W 2.5-4.6 AAAAA  Central California         

 

O: 22OCT2021 13:55:27  38.5N  119.4W ml=2.4  EMSC   CENTRAL CALIFORNIA           

P: 24OCT2021 138168    38.5N  119.6W 2.5-4.4 AAAAA  California/Nevada area     

 

 

O: 23OCT2021 04:26:26  38.9N  122.7W ML=2.7  EMSC   NORTHERN CALIFORNIA

O: 23OCT2021 04:28:00  38.8N  122.8W Md=2.7  EMSC   NORTHERN CALIFORNIA          

P: 22OCT2021 138176    38.7N  122.7W 2.5-4.4 AAAAA  Central California         

 

NEIC reported these earthquakes of M 3.2 and 2.9 in the Geysers, California was felt with intensity II-III in the area(s) of the Geysers, California in Geyserville, Cloverdale, Healdsburg, Cotati and V in Kelseyville.

 

ALASKA

 

O: 23OCT2021 03:10:03  51.6N  178.8E mb=5.1  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 27OCT2021 138274    51.0N  179.0E 4.0-5.6 BAAAA  Rat Islands                

 

O: 23OCT2021 01:52:40  69.1N  144.6W ML=3.2  EMSC   NORTHERN ALASKA              

P: 26OCT2021 138290    69.0N  144.0W 2.5-4.0 BAAAA  Northern Alaska            

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

No events of M>=2 were located in the northwestern U.S. or western Canada today.

 

ROCKY MOUNTAINS REGION

 

 

O: 22OCT2021 23:55:22  31.7N  104.4W ML=3.5  EMSC   WESTERN TEXAS                

P: 24OCT2021 138199    32.6N  104.6W 2.0-3.9 AAAAA  SW U.S.A                   

 

O: 22OCT2021 11:29:38  39.5N  112.0W ML=3.4  EMSC   UTAH

O: 22OCT2021 15:24:36  39.4N  112.0W Ml=2.1  EMSC   UTAH                         

P: 25OCT2021 138217    38.7N  112.6W 2.0-4.1 BAAAA  Utah area                   

 

NEIC reported this earthquake of M 3.2 in Utah was felt with intensity II-III in the area(s) of Utah at Nephi, Centerfield, Santaquin,  Provo, Todele and West Jordan.

 

O: 22OCT2021 11:00:48  44.5N  115.2W Ml=2.7  EMSC   SOUTHERN IDAHO

O: 22OCT2021 17:06:37  44.3N  115.0W Ml=2.2  EMSC   SOUTHERN IDAHO               

P: 24OCT2021 138234    44.4N  115.4W 2.0-4.0 AAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

No earthquakes of M>=1 were located in the Eastern U.S. or Canada today.

 

HAWAII

 

No earthquakes of M>=3 were located in Hawaii.