MODERATE EARTHQUAKES SHAKE WESTERN U.S.  

 

EARTHQUAKE SUMMARY FOR APRIL 29, 2016

 

Light to moderate earthquake hit two regions of the western U.S. today. The strongest earthquake in the world was an M 5.1 in Southern Alaska but shaking also occurred in the San Francisco Bay area of California where a pair of events of M 2.8 and 2.9 were felt. The only other earthquake of M>=5 today was an M 5.1 in the South Atlantic, marking a hiatus in global seismicity following several weeks of elevated global seismicity. Both events of M 5.1 in Alaska and the South Atlantic area located at 103-105 degrees from the M 7.8 in Sumatra of March 2 and were probably promoted by energy from that event.

 

The strongest earthquake in the world today was an M 4.9-5.1 in Southern Alaska. NEIC reported this earthquake of M 4.9 in Southern Alaska was felt with intensity II-III in the area(s) of Homer, Anchor Point, Soldotna and Anchorage, Alaska.  An M 3.1 near Anchorage, Alaska was felt with intensity II in Anchorage. This is a somewhat unusual epicenter but is probably a regional aftershock of the M 7.1 which hit about 100 km to the northwest on January 24. The last earthquake of M>=5 in this region within 100 km of this epicenter was an M 5.0 on January 25, 2010 and an M 5.4 on December 18, 2009. Forecasts 97658 and 97914 had expected a moderate event in this region was likely at the end of April or in early May. This epicenter is located at 105 degrees from the great M 7.8 earthquake in Sumatra of March 2 and may have been promoted from that source.

 

O: 29APR2016 08:17:34  59.0N  152.3W ml=4.9  ANSS   Southern Alaska              

O: 29APR2016 09:13:32  59.1N  154.4W ml=3.4  ANSS   Southern Alaska              

O: 29APR2016 08:17:31  59.0N  152.8W mb=5.1  EMSC SOUTHERN ALASKA                 

P:  3MAY2016 97914     60.1N  150.6W 3.2-5.1 BBAAA  Central Alaska             

P: 23APR2016 97658     60.1N  153.4W 3.2-5.1 CAAAA  Central Alaska             

 

A pair of light earthquakes of M 2.9 and 2.8 shook the San Francisco Bay area of California today. NEIC reported the M 2.9 was felt with intensity II-III in San Leandro, Castro Valley, Oakland, Hayward, Alameda, San Lorenzo, Moraga, San Ramon, Dublin, Danville, Redwood City, San Francisco, Pleasanton, and San Pablo, California. The M 2.8 was felt with intensity II-III in Clayton, Antioch, Brentwood, Concord, Pittsburg, Alamo, and Oakley, California. This is an area which may be near a larger earthquake as noted previously in this summary. Strong earthquakes in this area have occasionally followed major events in Ecuador between 1.5 and 3 months later. These are usually preceded by increased seismicity at a lower magnitude level as well as some occasional unusual events. Moderate to strong earthquakes in this region also tend to  cluster in mid-April to mid-May, a pattern likely related to weather patterns. This is the pattern which is emerging at this time in the San Francisco Bay area. Forecast 97546 had expected these earthquake about 50 km to the west were likely around April 30. The last earthquake this far north in the San Francisco area of M>=2.9 was an M 2.9 on January 29, 2016. The last of M>=3 occurred on December 19, 2015 with M 3.0-3.1.

 

O: 29APR2016 21:19:34  37.7N  122.1W md=2.9  ANSS   San Leandro California       

O: 29APR2016 18:43:30  37.9N  121.8W md=2.8  ANSS   W of Brentwood California    

P: 30APR2016 97546     37.8N  122.6W 2.5-4.5 AAAAA  Central 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: 29APR2016 18:45:34  24.2N  121.8E mb=4.0  CWB    SW of Hualian Taiwan         

O: 30APR2016 00:09:27  24.1N  122.3E mb=4.4  CWB    SW of Hualian Taiwan         

P: 27APR2016 97534     24.0N  123.0E 4.0-5.4 AAAAA  Taiwan                     

 

CWB reported the M 4.0 was felt with intensity III in Hualien and II in Yilan Counties, Taiwan.

The M 4.4 was felt with intensity II in Hualien and I in Yilan Counties, Taiwan.

 

O: 29APR2016 04:36:36  39.7N   74.1E mb=4.7  ANSS   E of Sary-Tash Kyrgyzstan    

P: 30APR2016 97555     39.0N   71.0E 3.8-5.2 AABAA  Hindu Kush/Pakistan        

 

NEIC reported this earthquake of M 4.7 in Kyrgyzstan was felt with intensity II-III in the area(s) of Os, Kyrgyzstan.

 

O: 29APR2016 22:31:55  55.7N  110.2E mb=4.1  EMSC LAKE BAYKAL REGION, RUSSIA     

P: 24APR2016 97652     56.0N  110.0E 3.0-4.4 BAAAA  So. Siberia                

 

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

 

INDONESIA AND PHILIPPINES

 

O: 29APR2016 23:42:26   0.0N  125.9E mb=4.4  ANSS   SSE of Bitung Indonesia      

P: 28APR2016 97467      1.0N  127.0E 4.0-5.8 AAAAA  Halmahera                  

 

O: 30APR2016 02:59:47   4.6S  134.3E mb=4.6  ANSS   N of Dobo Indonesia          

P: 23APR2016 97493      5.0S  134.0E 4.0-5.7 CAAAA  West Irian, PNG            

 

O: 29APR2016 17:35:18   7.3S  105.8E mb=4.7  ANSS   S of Tanjungan Indonesia     

P: 25APR2016 97487      7.0S  104.0E 4.0-5.6 BABAA  So. of Sumatera            

 

CENTRAL AND SOUTH AMERICA

 

O: 29APR2016 06:33     15.5S   73.2W mb=4.7  IGP    Caraveli, II-III Cotahuasi, Pa

P: 23APR2016 97681     16.0S   73.0W 4.0-5.4 CAAAA  So. Peru/Bolivia           

 

IGP reported this earthquake was felt with intensity III in  Caraveli, II-III Cotahuasi, Pausa; II Pampacolca, Viraco, Peru.

 

O: 29APR2016 17:37:54   6.8N   82.7W mw=4.6  ANSS   Punta de Burica Panama       

P: 26APR2016 97464      8.0N   83.0W 3.5-5.3 BBAAA  Costa Rica                  

 

O: 29APR2016 06:33:18  15.5S   73.3W mb=4.7  ANSS   SE of Coracora Peru          

P: 23APR2016 97681     16.0S   73.0W 4.0-5.4 CAAAA  So. Peru/Bolivia           

 

O: 29APR2016 04:25:49  19.7N   65.4W Md=3.6  ANSS   Vieques Puerto Rico           

O: 29APR2016 22:11:36  18.5N   65.9W Md=3.0  ANSS   Loiza Puerto Rico

O: 29APR2016 05:56:17  19.5N   65.3W Md=3.2  ANSS   Vieques Puerto Rico

P:  3MAY2016 97764     19.0N   65.0W 3.0-5.0 BAAAA  Leeward Islands            

 

O: 30APR2016 02:49:06  29.8S   72.0W mb=4.6  ANSS   WNW of Coquimbo Chile        

P:  2MAY2016 97948     29.0S   72.0W 4.0-5.7 AAAAA  Coast Central Chile        

 

O: 28APR2016 22:36:20  16.0N   93.0W ML=3.6  UNAM   NORESTE de PIJIJIAPAN, CHIS 

O: 29APR2016 08:07:03  14.9N   93.2W ML=3.4  UNAM   SUROESTE de MAPASTEPEC, CHIS 

O: 29APR2016 02:57:46  14.4N   93.2W ML=3.8  UNAM    SUROESTE de HUIXTLA, CHIS 

O: 28APR2016 22:16:10  14.7N   93.2W ML=4.5  UNAM   SUROESTE de MAPASTEPEC, CHIS 

O: 29APR2016 01:01:44  14.4N   93.3W ML=3.8  UNAM    SUROESTE de HUIXTLA, CHIS 

O: 29APR2016 06:57:50  15.3N   93.4W ML=3.3  UNAM   SUROESTE de PIJIJIAPAN, CHIS 

O: 29APR2016 00:19:08  14.1N   93.5W ML=3.6  UNAM    SUROESTE de CD HIDALGO, CHIS 

O: 29APR2016 02:39:20  15.8N   93.5W ML=3.6  UNAM   OESTE de PIJIJIAPAN, CHIS 

O: 29APR2016 09:42:49  15.8N   93.6W ML=4.0  UNAM   SURESTE de TONALA, CHIS 

O: 29APR2016 08:53:00  14.7N   92.9W ML=3.6  UNAM   SUROESTE de HUIXTLA, CHIS    

P:  1MAY2016 97503     15.0N   92.0W 3.5-5.1 AAAAA  Guatemala                   

P: 29APR2016 97498     15.0N   93.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O: 28APR2016 22:11:31  15.5N   95.9W ML=3.9  UNAM   SURESTE de CRUCECITA, OAX 

O: 29APR2016 04:35:49  15.8N   94.5W ML=3.8  UNAM   SURESTE de UNION HIDALGO, OAX 

O: 29APR2016 21:50:37  16.2N   94.5W ML=4.2  UNAM   SURESTE de UNION HIDALGO, OAX 

O: 29APR2016 04:53:16  15.7N   94.0W ML=3.8  UNAM   SUROESTE de TONALA, CHIS     

P: 29APR2016 97499     15.0N   95.0W 3.5-5.5 AAAAA  Chiapas, Mexico            

 

O: 29APR2016 01:13:16  16.9N   95.2W ML=3.8  UNAM   OESTE de MATIAS ROMERO, OAX 

O: 29APR2016 09:30:26  17.4N   95.6W ML=4.1  UNAM   SUROESTE de J RODRIGUEZ CLARA, VER 

O: 29APR2016 05:23:45  17.6N   95.0W ML=3.7  UNAM   SUR de SAYULA DE ALEMAN, VER 

P:  1MAY2016 97499     17.0N   95.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O: 29APR2016 05:16:50  15.4N   96.9W ML=3.3  UNAM   SURESTE de PUERTO ESCONDIDO, O

P:  1MAY2016 97515     16.0N   97.0W 3.5-5.1 AAAAA  Oaxaca, Mexico             

 

O: 29APR2016 06:35:50  16.3N   98.2W ML=3.6  UNAM   SUROESTE de PINOTEPA NACIONAL,

P:  1MAY2016 97514     16.0N   98.0W 3.5-5.1 AAAAA  Oaxaca, Mexico             

 

O: 29APR2016 05:22:29  17.1N  100.7W ML=3.7  UNAM   SUR de TECPAN, GRO 

O: 29APR2016 10:06:34  17.5N  100.9W ML=3.5  UNAM   ESTE de PETATLAN, GRO 

O: 29APR2016 04:58:07  16.9N  100.2W ML=3.8  UNAM   SUROESTE de COYUCA DE BENITEZ,

P: 30APR2016 97516     18.0N  100.0W 3.5-5.1 AAAAA  Oaxaca, Mexico             

 

O: 28APR2016 23:16:37  18.0N  101.5W ML=3.6  UNAM   NORTE de ZIHUATANEJO, GRO 

O: 29APR2016 11:39:35  18.7N  102.5W ML=3.9  UNAM   SUROESTE de APATZINGAN, MICH 

O: 29APR2016 03:03:05  17.3N  101.3W ML=3.4  UNAM   SUR de PETATLAN, GRO         

P:  1MAY2016 97509     17.0N  102.0W 3.5-5.3 AAAAA  Michoacan, Mexico          

 

O: 29APR2016 13:22:05  18.5N  103.5W ML=4.0  UNAM   SUROESTE de COALCOMAN, MICH  

P: 28APR2016 97510     18.0N  103.0W 3.5-5.3 AAAAA  Michoacan, Mexico          

 

AFRICA AND EUROPE

 

O: 29APR2016 23:36:29  34.4N   26.5E mw=4.5  ANSS   Makry Gialos Greece          

P:  2MAY2016 97810     34.0N   27.0E 3.0-4.8 AAAAA  Crete                      

P: 26APR2016 97553     34.0N   27.0E 3.0-4.9 AAAAA  Crete                      

 

O: 29APR2016 03:50:54  38.7N   20.5E mb=4.2  ANSS   W of Nidri Greece            

P: 25APR2016 97565     39.0N   21.0E 3.0-4.7 BAAAA  No. Greece                 

 

EMSC reported this earthquake of M 4.0-4.2 in Greece was felt with intensity II-III in the area(s) of Kontarena, Lefkada, Greece. 

 

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

 

SOUTHWEST PACIFIC

 

O: 29APR2016 20:07:13  15.1S  173.4W mb=4.8  ANSS   NNE of Hihifo Tonga          

P: 24APR2016 97684     16.0S  173.0W 4.0-5.4 BAAAA  Tonga Islands              

 

O: 29APR2016 22:50:14  16.1S  166.9E mb=4.8  ANSS   W of Norsup Vanuatu

O: 29APR2016 22:09:02  16.2S  167.2E mb=5.0  ANSS   WSW of Lakatoro Vanuatu

O: 30APR2016 04:38:28  16.3S  167.2E mb=5.0  ANSS   SW of Norsup Vanuatu         

P:  2MAY2016 97944     17.0S  167.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

OCEAN RIDGES

 

O: 30APR2016 00:36:03  31.3S   13.6W mb=5.1  ANSS   Southern Mid-Atlantic Ridge" 

O: 30APR2016 00:36:07  31.3S   13.5W mb=5.1  EMSC SOUTHERN MID-ATLANTIC

 

NEW ZEALAND AND AUSTRALIA REGION

 

No earthquakes of M>=4 were recorded in the regions of New Zealand or Australia

today. GeoNet did not report any felt events in the area.

 

JAPAN AND KURIL ISLANDS

 

O: 29APR2016 06:09:36  33.2N  131.3E mb=4.3  ANSS   ESE of Tsukawaki Japan       

P: 22APR2016 97559     33.0N  130.0E 3.5-5.9 CAAAA  Kyushu, Japan area         

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 29APR2016 10:55:20  32.4N  115.2W ml=2.8  ANSS   Delta B.C. MX                

O: 29APR2016 10:55:16  32.4N  114.9W ML=3.3  UNAM   SUROESTE de S LUIS R COLORADO, SON 

O: 29APR2016 10:55:25  32.4N  115.3W ml=3.0  ANSS   Delta B.C. MX                

P:  2MAY2016 97830     31.9N  116.3W 2.5-4.4 AAAAA  So. California             

 

O: 30APR2016 00:34:02  37.5N  118.9W md=2.9  ANSS   Mammoth Lakes California     

P:  1MAY2016 97541     37.8N  118.2W 2.5-4.6 AAAAA  California/Nevada area     

 

O: 29APR2016 21:19:34  37.7N  122.1W md=2.9  ANSS   San Leandro California       

O: 29APR2016 18:43:30  37.9N  121.8W md=2.8  ANSS   W of Brentwood California    

P: 30APR2016 97546     37.8N  122.6W 2.5-4.5 AAAAA  Central California         

 

O: 29APR2016 08:45:27  38.7N  122.9W md=2.0  ANSS   NNW of Healdsburg California 

O: 29APR2016 15:51:58  39.0N  122.6W md=2.1  ANSS   NNE of Clearlake California  

P: 30APR2016 97548     39.3N  123.2W 2.5-4.6 AAAAA  Central California         

 

NEIC reported this earthquake of M 2.1 in Northern California was felt with intensity II-III in the area(s) of Healdsburg, California.

 

O: 30APR2016 05:55:00  39.3N  117.3W ml=2.8  ANSS   Nevada                       

P: 23APR2016 97544     39.9N  118.4W 2.5-4.4 CAAAA  California/Nevada area     

 

 

ALASKA

 

O: 29APR2016 08:17:34  59.0N  152.3W ml=4.9  ANSS   Southern Alaska              

O: 29APR2016 09:13:32  59.1N  154.4W ml=3.4  ANSS   Southern Alaska              

O: 29APR2016 08:17:31  59.0N  152.8W mb=5.1  EMSC SOUTHERN ALASKA                

P:  3MAY2016 97914     60.1N  150.6W 3.2-5.1 BBAAA  Central Alaska             

P: 23APR2016 97658     60.1N  153.4W 3.2-5.1 CAAAA  Central Alaska             

 

O: 29APR2016 21:32:26  59.8N  152.9W ml=3.0  ANSS   W of Anchorage, Alaska       

O: 29APR2016 05:27:27  61.0N  150.3W ml=3.1  ANSS   Southern Alaska              

P:  3MAY2016 97914     60.1N  150.6W 3.2-5.1 BAAAA  Central Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

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

 

ROCKY MOUNTAINS REGION

 

O: 29APR2016 17:46:14  46.7N  112.5W ml=2.2  ANSS   Helena West Side Montana     

P:  2MAY2016 97865     45.7N  112.1W 2.0-3.9 BAAAA  Montana/Idaho              

 

EASTERN U.S./CANADA

 

O: 29APR2016 08:58:13  33.4N   87.2W mb=3.0  ANSS   Lake View Alabama            

P: 21APR2016 97325     32.0N   87.0W 2.0-4.0 CBAAA  Southeast U.S.             

 

O: 29APR2016 07:02:39  35.7N   82.6W md=1.5  ANSS   Weaverville North Carolina   

O: 29APR2016 08:56:24  35.7N   82.6W md=1.8  ANSS   Weaverville North Carolina   

P: 25APR2016 97557     35.9N   82.8W 2.0-3.9 BAAAA  Kentucky/Tennessee/NC      

P: 28APR2016 97557     35.0N   82.0W 2.0-4.0 AAAAA  Kentucky/Tennessee/NC      

 

O: 29APR2016 02:12:04  43.6N   78.0W ML=1.9  NRCA  Lake Ontario.                 

P: 30APR2016 97614     43.0N   78.0W 2.0-3.9 AAAAA  New York State              

 

O: 29APR2016 01:49:29  46.5N   76.4W ML=2.5  NRCA  W from Maniwaki               

P: 28APR2016 97614     45.0N   75.0W 2.0-4.2 ABAAA  New York State             

 

O: 28APR2016 01:35:54  50.9N   63.2W ML=1.4  NRCA  N from Baie-Johan-Beetz       

P: 29APR2016 97607     49.3N   67.5W 2.0-4.1 ABCAA  Maine                      

 

O: 29APR2016 05:06:29  35.5N   96.8W mb=2.7  ANSS   NW of Prague Oklahoma

O: 30APR2016 03:34:05  35.5N   97.3W mb=2.9  ANSS   E of Spencer Oklahoma

O: 29APR2016 16:20:36  35.7N   97.2W mb=3.3  ANSS   N of Luther Oklahoma

O: 29APR2016 21:56:56  35.7N   97.2W mb=3.3  ANSS   NNE of Luther Oklahoma

O: 29APR2016 04:51:58  36.4N   97.1W ml=2.5  ANSS   Oklahoma

O: 29APR2016 19:03:55  36.8N   97.6W mb=2.6  ANSS   ESE of Medford Oklahoma

O: 29APR2016 22:45:03  36.9N   97.3W mb=3.0  ANSS   NNW of Blackwell Oklahoma    

P: 28APR2016 97587     36.0N   97.0W 2.0-3.9 AAAAA  Southern Plains            

 

NEIC reported this earthquake of M 3.3 in Oklahoma was felt with intensity II-III in the area(s) of Luther and Stillwater, Oklahoma.

 

HAWAII

 

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