MODERATE QUAKES IN GREENLAND SEA; CENTRAL ALASKA

 

EARTHQUAKE SUMMARY FOR JULY 22, 2021

 

The strongest earthquake in the world today was an M 5.5 in the Greenland Sea. It was not reported felt in this remote area. It may have been promoted by the minor geomagnetic storm at high latitudes which occurred today, the strongest in more than a month. This summary noted this possibility as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 11.  High latitude geomagnetic field  saw minor storm conditions with AP 28. This is the strongest geomagnetic disturbance at high latitudes in more than a month and could bring enhanced seismicity at high latitudes in the next several days." (July 22, 2021)

 

A slightly smaller event at this epicenter in the Greenland Sea occurred on March 23, 2021. At the time this summary noted:

 

"The M 5.3-5.4 in the Greenland Sea is the largest in that area within about 300 km of this epicenter since an M 5.6 on February 8, 2018 and prior to that an M 6.5 on March 5, 2009." (March 24, 2021)

 

Forecast 135599 had expected today's event within about 100 km was likely around July 21.

 

O: 23JUL2021 04:05:38  79.8N    3.1E Mw=5.5  EMSC   GREENLAND SEA                

P: 21JUL2021 135599    79.0N    7.0E 4.0-5.8 AAAAA  Arctic Ocean Region        

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in Central Alaska. NEIC reported maximum intensity IV at Eielson AFB with intensity II-III in Fairbanks, North Pole, Healy, Delta Junction, Clear and Anderson, Alaska. Like the event in the Greenland Sea this may have been promoted by the strong geomagnetic disturbance today at high latitudes. An M 4.4 also occurred south of this South of  Alaska in the Unimak Island region. These events had been expected between July 18 and 26 within about 100 km of these epicenters. The M 4.7 near Fairbanks is the strongest within about 150 km of that epicenter since an M 4.8 on February 17, 2007. An M 5.5 hit about 250 km southwest of this on April 8, 2021. 

 

O: 23JUL2021 04:20:19  64.5N  146.8W mb=4.7  EMSC   CENTRAL ALASKA               

P: 18JUL2021 135593    63.3N  145.0W 3.2-5.2 BBAAA  Central Alaska             

P: 26JUL2021 135848    63.1N  144.7W 3.2-5.1 BBAAA  Central Alaska             

 

The M 4.4 south of Alaska is the strongest within about 150 km of that epicenter since an M 4.5 on March 28, 2021.  It had been expected to occur within about 100 km around July 24.

 

O: 22JUL2021 13:12:31  53.6N  162.8W mb=4.4  EMSC   SOUTH OF ALASKA              

P: 24JUL2021 135840    54.3N  162.7W 3.5-5.1 AAAAA  Unimak Islands, Aleutians  

 

Other high latitude seismicity occurred in northern Russia with a series of moderate quakes in Mongolia, Kamchatka and Northwestern Sakha.

 

O: 22JUL2021 07:45:30  51.3N  100.4E mb=3.9  EMSC   RUSSIA-MONGOLIA BORDER REGION

P: 21JUL2021 135584    51.0N   98.0E 3.0-4.4 AABAA  So. Siberia                

 

O: 22JUL2021 16:02:51  53.7N  158.4E mb=4.0  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 25JUL2021 135829    51.0N  158.0E 4.0-5.7 BBAAA  Kamchatka                   

 

O: 22JUL2021 11:44:06  55.6N  162.0E mb=4.5  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 28JUL2021 135827    54.0N  162.0E 4.0-5.4 CBAAA  E. of Kamchatka            

 

O: 22JUL2021 18:34:43  72.4N  125.3E mb=4.0  EMSC   NORTHWESTERN SAKHA, RUSSIA   

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: 23JUL2021 00:11:22  22.0N  121.1E ML=4.0  TAI    Hualien, Taiwan              

P: 25JUL2021 135719    23.0N  122.0E 4.0-5.6 AAAAA  Taiwan                     

 

CWB reported this earthquake was felt with intensity III in Pingtung and I in Taitung Counties, Taiwan.

 

O: 22JUL2021 16:01:31  34.2N   52.1E ML=4.0  EMSC   CENTRAL IRAN                 

P: 28JUL2021 135750    36.0N   51.0E 3.8-5.4 CBAAA  No. Iran                   

 

O: 22JUL2021 07:45:30  51.3N  100.4E mb=3.9  EMSC   RUSSIA-MONGOLIA BORDER REGION

P: 21JUL2021 135584    51.0N   98.0E 3.0-4.4 AABAA  So. Siberia                

 

O: 22JUL2021 16:02:51  53.7N  158.4E mb=4.0  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 25JUL2021 135829    51.0N  158.0E 4.0-5.7 BBAAA  Kamchatka                  

 

O: 22JUL2021 11:44:06  55.6N  162.0E mb=4.5  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 28JUL2021 135827    54.0N  162.0E 4.0-5.4 CBAAA  E. of Kamchatka            

 

O: 22JUL2021 18:34:43  72.4N  125.3E mb=4.0  EMSC   NORTHWESTERN SAKHA, RUSSIA   

 

INDONESIA AND PHILIPPINES

 

O: 22JUL2021 22:53:07   1.2N  126.9E mb=4.5  EMSC   MOLUCCA SEA                  

P: 24JUL2021 135656     0.0N  125.0E 4.0-5.6 BAAAA  Mindanao, Philippines      

 

O: 23JUL2021 06:16:04   4.6S  153.0E Mw=5.2  EMSC   NEW BRITAIN REGION, P.N.G.   

P: 26JUL2021 135667     5.0S  153.0E 4.0-5.5 BAAAA  New Britain                

 

O: 22JUL2021 16:20:21   8.3S  124.1E mb=4.3  EMSC   KEPULAUAN ALOR, INDONESIA    

P: 24JUL2021 135660     7.0S  127.0E 4.0-5.4 ABCAA  Banda Sea                  

 

O: 22JUL2021 11:15:14  11.5N  124.4E ML=4.3  EMSC   LEYTE, PHILIPPINES           

P: 25JUL2021 135687    12.0N  124.0E 3.5-5.2 BAAAA  Luzon, Philippines         

 

 

CENTRAL AND SOUTH AMERICA

 

O: 22JUL2021 12:49:38   1.6S   80.9W ML=4.2  EMSC   NEAR COAST OF ECUADOR        

P: 26JUL2021 135663     1.0S   81.0W 4.0-5.4 BAAAA  Ecuador                    

 

O: 22JUL2021 13:25:30   7.0N   82.7W ML=4.4  EMSC   SOUTH OF PANAMA

O: 22JUL2021 07:44:30   7.5N   82.8W ML=4.1  EMSC   SOUTH OF PANAMA

O: 22JUL2021 12:51:45   7.5N   82.7W Mw=5.1  EMSC   SOUTH OF PANAMA              

P: 19JUL2021 135406     7.0N   82.0W 3.5-5.2 BAAAA  Costa Rica                 

P: 25JUL2021 135652     7.0N   82.0W 3.5-6.1 BAAAA  Costa Rica                 

 

NEIC reported this aftershock of M 5.1 in Panama was felt with intensity II-III in the area(s) of Panama at David and Boquete.

 

O: 23JUL2021 02:40:36  17.9N   66.8W Md=3.0  EMSC   PUERTO RICO REGION           

O: 22JUL2021 16:26:47  18.0N   67.0W Md=3.0  EMSC   PUERTO RICO

O: 22JUL2021 22:15:38  18.0N   67.1W Md=3.1  EMSC   PUERTO RICO

O: 22JUL2021 21:05:05  18.4N   67.3W Md=3.0  EMSC   MONA PASSAGE, PUERTO RICO

P: 24JUL2021 135697    18.0N   67.0W 3.4-5.1 AAAAA  Puerto Rico                

 

O: 22JUL2021 20:45:49  19.6N   70.4W ML=3.4  EMSC   DOMINICAN REPUBLIC           

P: 23JUL2021 135699    19.0N   72.0W 3.4-5.0 AABAA  Puerto Rico                

 

O: 22JUL2021 23:43:51  21.2N  106.3W ML=4.3  EMSC   ISLAS MARIAS REG., NAYARIT, ME

P: 19JUL2021 135439    19.0N  107.0W 3.5-5.3 BCAAA  Coast of Jalisco, Mexico   

 

O: 22JUL2021 19:23:35  23.4S   68.5W ML=4.0  EMSC   ANTOFAGASTA, CHILE           

O: 22JUL2021 13:11:41  24.2S   67.6W ML=4.2  EMSC   SALTA, ARGENTINA

P: 24JUL2021 135871    24.0S   69.0W 4.0-5.6 AAAAA  Coast No. Chile            

 

 

AFRICA AND EUROPE

 

O: 22JUL2021 14:06:22  42.8N   12.6E ML=3.5  EMSC   CENTRAL ITALY                

P: 25JUL2021 135793    43.0N   12.0E 3.0-5.4 BAAAA  Italy                      

 

O: 22JUL2021 14:16:26  36.4N   27.0E mb=4.8  EMSC   DODECANESE IS.-TURKEY BORDER R

P: 17JUL2021 135476    37.0N   26.0E 3.0-4.6 BAAAA  Aegean Sea                 

 

NEIC reported this earthquake of M 4.8 in Western Turkey was felt with intensity II-III in the area(s) of Western Turkey at Datca and Bodrum, Mugla.

 

O: 22JUL2021 16:49:38  39.8N   20.7E mb=4.6  EMSC   GREECE                       

P: 28JUL2021 135748    38.0N   22.0E 3.0-4.8 CBAAA  No. Greece                 

 

NEIC reported this earthquake of M 4.6 in Greece was felt with intensity II-III in the area(s) of Greece at Doliana, Tsifikopoulon and Ipannina, Ipannina and in Sarande, Albania.

 

O: 23JUL2021 04:05:38  79.8N    3.1E Mw=5.5  EMSC   GREENLAND SEA                

P: 21JUL2021 135599    79.0N    7.0E 4.0-5.8 AAAAA  Arctic Ocean Region        

 

SOUTHWEST PACIFIC

 

O: 23JUL2021 01:16:39  16.3S  173.7W mb=4.8  EMSC   TONGA                        

P: 24JUL2021 135869    16.0S  175.0W 4.0-5.7 AAAAA  Tonga Islands              

 

O: 23JUL2021 04:58:35  22.0S  178.8W mb=4.2  EMSC   SOUTH OF FIJI ISLANDS        

P: 29JUL2021 135880    23.0S  177.0W 4.0-5.7 CAAAA  Tonga Islands              

 

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

 

OCEAN RIDGES

 

O: 23JUL2021 04:05:38  79.8N    3.1E Mw=5.5  EMSC   GREENLAND SEA                

P: 21JUL2021 135599    79.0N    7.0E 4.0-5.8 AAAAA  Arctic Ocean Region        

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 22JUL2021 17:47:44  33.0S  179.5E ML=4.2  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 16JUL2021 135636    33.0S  178.0E 4.0-5.6 CAAAA  So. Kermadec Islands       

 

O: 23JUL2021 02:46:45  35.5S  179.5E ML=4.0  EMSC   OFF E. COAST OF N. ISLAND, N.Z

P: 30JUL2021 135886    37.0S  179.0E 3.5-4.9 CBAAA  E. of North Islands 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: 22JUL2021 19:21:10  32.8N  115.5W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 22JUL2021 19:04:38  32.8N  115.5W Ml=2.3  EMSC   SOUTHERN CALIFORNIA          

P: 21JUL2021 135511    32.6N  116.1W 2.5-4.6 AAAAA  So. California             

 

O: 22JUL2021 22:19:59  33.7N  116.8W Ml=2.1  EMSC   SOUTHERN CALIFORNIA          

P: 25JUL2021 135768    33.9N  116.9W 2.5-4.8 BAAAA  So. California             

 

O: 22JUL2021 20:14:11  34.0N  117.6W Ml=2.4  EMSC   GREATER LOS ANGELES AREA, CALI

P: 28JUL2021 135768    34.2N  117.8W 2.5-4.9 CAAAA  So. California             

 

NEIC reported this earthquake of M 2.5 in Greater Los Angeles, California was felt with intensity II-III in the area(s) of Greater Los Angeles, California at Riverside, Rancho Cucamonga and Norco.

 

O: 22JUL2021 08:57:59  34.7N  120.4W Ml=2.0  EMSC   CENTRAL CALIFORNIA           

P: 19JUL2021 135515    34.7N  119.0W 2.5-4.7 BABAA  So. California             

 

O: 23JUL2021 00:20:18  35.6N  120.8W Md=2.0  EMSC   CENTRAL CALIFORNIA           

P: 17JUL2021 135506    35.6N  121.3W 2.5-4.6 CAAAA  Off So. California         

 

O: 22JUL2021 17:41:54  37.3N  120.0W Md=2.1  EMSC   CENTRAL CALIFORNIA           

P: 24JUL2021 135734    37.1N  121.5W 2.5-4.6 AABAA  Central California         

 

O: 22JUL2021 19:43:56  38.2N  117.9W ml=2.1  EMSC   NEVADA                       

P: 25JUL2021 135728    37.9N  118.2W 2.5-4.9 BAAAA  California/Nevada area     

 

O: 22JUL2021 19:19:58  39.0N  122.0W Md=2.8  EMSC   NORTHERN CALIFORNIA          

P: 25JUL2021 135736    39.0N  123.1W 2.5-4.6 BAAAA  Central California         

 

NEIC reported this earthquake of M  2.8 in Northern California was felt with intensity II-III in the area(s) of Northern California at Arbuckle, Woodland, Lincoln, Sacramento.

 

O: 23JUL2021 05:15:56  39.7N  122.9W Md=2.4  EMSC   NORTHERN CALIFORNIA          

P: 28JUL2021 135736    39.6N  123.4W 2.5-4.6 BAAAA  Central California         

 

O: 22JUL2021 20:59:39  40.1N  122.9W Md=2.2  EMSC   NORTHERN CALIFORNIA          

P: 26JUL2021 135805    40.4N  122.2W 2.5-4.8 AAAAA  Northern California        

 

O: 23JUL2021 03:42:53  40.4N  124.8W Md=2.1  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 27JUL2021 135807    40.7N  124.6W 2.5-4.5 BAAAA  Off Coast of No. Calif     

 

 

O: 22JUL2021 18:16:58  38.5N  119.5W ML=2.4  EMSC   CENTRAL CALIFORNIA

O: 22JUL2021 18:53:06  38.5N  119.5W ml=2.6  EMSC   CENTRAL CALIFORNIA

O: 22JUL2021 19:57:43  38.5N  119.6W ml=2.0  EMSC   CENTRAL CALIFORNIA

O: 23JUL2021 01:59:45  38.5N  119.5W Md=2.2  EMSC   CENTRAL CALIFORNIA

O: 22JUL2021 16:14:16  38.6N  119.4W MD=2.1  EMSC   CENTRAL CALIFORNIA

O: 23JUL2021 02:52:15  38.6N  119.5W Md=2.1  EMSC   CENTRAL CALIFORNIA

O: 23JUL2021 04:40:53  38.8N  119.3W ml=3.0  EMSC   NEVADA

O: 22JUL2021 15:41:34  38.5N  119.5W ml=2.1  EMSC   CENTRAL CALIFORNIA           

P: 23JUL2021 135729    38.7N  119.7W 2.5-4.6 AAAAA  California/Nevada area     

 

O: 22JUL2021 19:53:47  41.7N  121.9W Md=2.0  EMSC   NORTHERN CALIFORNIA

O: 22JUL2021 16:23:38  41.3N  121.9W Md=2.0  EMSC   NORTHERN CALIFORNIA          

P: 26JUL2021 135805    40.4N  122.2W 2.5-4.8 BAAAA  Northern California        

 

ALASKA

 

O: 23JUL2021 04:20:19  64.5N  146.8W mb=4.7  EMSC   CENTRAL ALASKA               

P: 18JUL2021 135593    63.3N  145.0W 3.2-5.2 BBAAA  Central Alaska             

P: 26JUL2021 135848    63.1N  144.7W 3.2-5.1 BBAAA  Central Alaska             

 

O: 22JUL2021 13:12:31  53.6N  162.8W mb=4.4  EMSC   SOUTH OF ALASKA              

P: 24JUL2021 135840    54.3N  162.7W 3.5-5.1 AAAAA  Unimak Islands, Aleutians  

 

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: 23JUL2021 03:31:45  31.7N  104.4W ML=2.5  EMSC   WESTERN TEXAS

O: 22JUL2021 21:21:20  31.6N  104.3W ML=2.9  EMSC   WESTERN TEXAS                

P: 18JUL2021 135508    32.5N  104.6W 2.0-4.0 BAAAA  SW U.S.A                   

 

NEIC reported this earthquake of M 2.8 in Western Texas was felt with intensity II-III in the area(s) of Western Texas in Midland.

 

O: 23JUL2021 00:54:51  32.1N  102.1W mb=2.5  EMSC   WESTERN TEXAS                

P: 26JUL2021 135759    31.6N  103.6W 2.0-4.1 BAAAA  SW U.S.A                   

 

O: 22JUL2021 10:45:14  44.4N  110.3W Ml=2.4  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P: 24JUL2021 135819    44.2N  110.3W 2.0-4.1 AAAAA  Yellowstone/Wyoming        

 

O: 22JUL2021 07:36:20  44.4N  115.2W Ml=2.0  EMSC   SOUTHERN IDAHO               

P: 25JUL2021 135799    44.9N  115.4W 2.0-4.0 BAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O: 22JUL2021 09:23:17  35.1N   95.3W mb=2.9  EMSC   OKLAHOMA

O: 22JUL2021 09:43:25  35.1N   95.3W ML=2.1  EMSC   OKLAHOMA

O: 22JUL2021 09:08:58  35.1N   95.3W ML=2.7  EMSC   OKLAHOMA                      

P: 25JUL2021 135779    35.0N   96.0W 2.0-4.1 BAAAA  Southern Plains            

 

NEIC reported these earthquakes of M 3.3 and 2.7 in Oklahoma were felt with intensity II-III in the area(s) of Oklahoma at Quinton.

 

O: 22JUL2021 01:05:34  49.6N   67.7W MB=1.4  ECAN Baie-Comeau, QC                

O: 21JUL2021 04:18:09  49.0N   67.5W MB=1.0  ECAN Matane, QC                     

P: 24JUL2021 135796    49.3N   67.5W 2.0-3.9 AAAAA  Maine                      

 

HAWAII

 

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