STRONG QUAKE UNDER CENTRAL ATLANTIC LIKELY PROMOTED BY GEOMAGNETIC STORM

 

EARTHQUAKE SUMMARY FOR AUGUST 17, 2017

 

The strongest earthquake in the world today was an M 6.6-6.7 north of Ascension Island in the central Atlantic. It was not reported felt in this remote epicentral area. It occurred on the geomagnetic equator at the height of the strongest geomagnetic storm in three months, since May 28 and was probably triggered by effects from this storm. A series of tropical waves and storms is beginning across the Atlantic as well with one very near the epicenter of today's earthquake, possibly influencing the timing of this event. The new geomagnetic storm and tropical cyclones across the Atlantic are likely to reset the global seismic map encouraging more seismicity in the regions of the Atlantic, the Caribbean and Central and North America in the next several weeks.

 

The geomagnetic field was at minor storm conditions today.  The AP level was 29.

High latitude geomagnetic field also saw stormy  conditions with AP at 59. This is the strongest geomagnetic storm since AP reached 51 on May 28 with high latitude AP of 84. With the new moon, this storm could activate a number of moderate to strong earthquakes. These would most likely occur near the geomagnetic equator expanding outwards over the next five days to 10-15 degrees from the equator. Some increases in event magnitude at high latitudes is also expected through August 24. The M 6.7 in the mid-Atlantic occurred at the height of this storm on the equator and was probably promoted by it.

 

No earthquakes of M>=5.5 have been recorded within about 250 km of this Atlantic epicenter during 2017. The last earthquake within this distance of the epicenter with M>=6.6 was an M 6.6 on February 18, 1996. The only event in the region in the past 25 years of larger magnitude was an M 6.9 on August 28, 1992. Forecast 109634 had expected this earthquake was likely about 200 km to the west around August 14. Areas at 103 degrees from this epicenter include much of the area from Central California north to Oregon and Washington and Southeast Alaska. These regions were active following this Atlantic event and may be expected to show some triggered activity in the next several days.  In particular, the area of Central California, including San Francisco, has had a flurry of small events over the past week and may be due for a larger triggered earthquake with the eclipse and effects from the Atlantic event today. This epicenter is near the seventh node from the events in western Turkey and the Dodecanese Islands, Greece of July 20 (M 6.7) and may have been influenced by energy from those events.

 

O: 18AUG2017 02:59:25   1.2S   13.7W Mw=6.6  EMSC   NORTH OF ASCENSION ISLAND    

O: 18AUG2017 02:59:21   1.1S   13.6W mw=6.6  ANSS   North of Ascension Island"

O: 17AUG2017 08:52:24   5.7S   12.5W mb=5.1  EMSC   ASCENSION ISLAND REGION      

P: 14AUG2017 109634     1.0S   16.0W 4.0-5.6 BABAA  Central Mid-Atlantic       

 

The most widely felt earthquake in the U.S. or Canada today was an M 4.0 in southeastern Alaska. NEIC reported it was felt with maximum intensity IV in Hoonah, Alaska and II-III in Gustavus, Haines, Skagway, Elfin Cove, Douglas, Juneau, Whitehorse and Angoon, Alaska. This is an aftershock of the two events of M 6.2 on May 1, the strongest such aftershock since May 21 when an M 4.3 occurred. Forecast 109812 had expected this event was likely within about 100 km of the epicenters around August 19.

 

O: 18AUG2017 04:44:36  59.0N  136.4W ML=4.0  EMSC   SOUTHEASTERN ALASKA           

P: 19AUG2017 109812    59.0N  138.0W 3.0-4.4 AAAAA  Southeast Alaska           

 

An earthquake of M 4.9 also occurred today in the Rat Islands, Alaska. It occurred near local solar noon a time when tidal stresses are high and may have been  promoted by them. This is the strongest earthquake in the Rat Islands since an M 5.0 on June 21. Forecast 109809 had expected this event within about 50 km  of this epicenter was likely around August 18.

 

O: 18AUG2017 01:17:00  51.3N  178.8E mb=4.9  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 18AUG2017 109809    52.0N  179.0E 4.0-5.6 AAAAA  Rat Islands                

 

An unusually large M 4.2 earthquake hit the area of Lisbon, Portugal today. NEIC reported it was felt with intensity II-III in Carregado, Castanheira de Ribatejo, Milharado, Venda do Pinheiro, Ericeira, Lisbon, Estoril, Portugal. EMSC reported light to moderate intensity in Portugal at Alenquer, Carregado, Vila Franca de Xira, Sao Joao dos Montes, Alcoentre, Ramalhal, Alverca do Ribatejo, Torres Vedras, Salvaterra de Magos and other communities within about 50 km of the epicenter. This epicenter is near the antipode of strong earthquakes which have occurred in New Zealand recently. This summary has watched this region carefully because antipodal triggering was and is a distinct possibility following the New Zealand activity. The area is capable of great earthquakes such as the Lisbon quake of November 1, 1766 and more recently activity off the coast of M 8+ in the 1960's. These events can and do generate Atlantic-wide destructive tsunamis.

 

This is the strongest earthquake felt in mainland Portugal since an M 4.5 on December 29, 2005. The strongest earthquake within about 250 km of this in the past 25 years occurred in the Atlantic west of Portugal as an M 4.7 on May 26, 1990.  Forecast 109719 had expected this event within about 75 km of the epicenter was likely around August 21.

 

O: 17AUG2017 09:06:56  39.0N    9.1W ML=2.0  EMSC   PORTUGAL                     

O: 17AUG2017 06:44:56  39.0N    9.1W mb=4.2  ANSS   Arruda dos Vinhos Portugal

O: 17AUG2017 06:44:56  39.1N    9.0W mb=4.2  EMSC   PORTUGAL                     

P: 21AUG2017 109719    39.0N    8.0W 3.5-4.9 BAAAA  Morocco/Spain              

 

The full moon will arrive at 18:30 UT on August 21. Longitudes which are sub-solar at the time of full moon are near 97W and 83E and include the Central U.S. Mexico and Central America in the west and India, China, Afghanistan and western Indonesia in the east. These longitude zones are most likely to see significant tidal triggering within about three days of August 21. Other areas may also see tidal triggering at this time, especially where fluids mitigate seismicity and where vertical motions are common. The much-anticipated solar eclipse of August 21 will pass over much of the central U.S. and will be viewed by millions of people at this vacation time of year. The eclipse is the first to be visible over the entire U.S. in 99 years. The full eclipse will be  visible from the Pacific Northwest through Lincoln, Nebraska and into the  southeast of the U.S. Tidal triggering could occur in Washington, Oregon or Northern California with lesser triggering in the central and southeastern U.S. Like the full moon this will reach maximum when over 97 West longitude (83 East) with maximum effects in the regions of Oklahoma and Kansas. The greatest  eclipse will occur over the New Madrid Fault in Missouri and Tennessee. A  moderate earthquake is possible in this area in the period August 18-25. The M 6.7 in the Central Atlantic today would be at the end point of this eclipse path and may have been promoted by high tidal stresses.

 

An M 5.3 in Mexico today occurred in the state of Guerrero. The earthquake in Guerrero, Mexico today was felt with intensity II-III in Mexico City and Nezahualcoyoti, Mexico. This is the largest earthquake in Guerrero, Mexico during the year 2017. The last of M>=5.3 was an event of M 5.5 on November 23, 2015 and prior to that  an M 6.0 on May 10, 2014 - and aftershock of an M 7.2 on April 18, 2014.  Forecasts 109402 and 109674 had expected this event within about 25 km was likely between August 11 and 18.  This epicenter is at the fourth node from the Atlantic event (90 degrees) and may have been promoted from that source.

 

O: 18AUG2017 05:58:06  16.8N  100.4W ML=4.1  EMSC   OFFSHORE GUERRERO, MEXICO    

O: 17AUG2017 02:43:54  16.5N   99.0W ML=4.1  UNAM  l SURESTE de SAN MARCOS, GRO *: 16

O: 17AUG2017 16:03:21  16.9N   99.8W ML=4.0  UNAM   NORESTE de ACAPULCO, GRO *: 16.92

O: 18AUG2017 05:58:06  16.8N  100.4W ML=4.1  UNAM  l SUROESTE de COYUCA DE BENITEZ, G

O: 18AUG2017 05:15:11  16.8N  100.4W ML=5.3  UNAM  l SUR de ATOYAC DE ALVAREZ, GRO *:

O: 17AUG2017 16:03:21  16.9N   99.8W ML=4.0  EMSC   GUERRERO, MEXICO             

O: 18AUG2017 05:15:14  17.0N  100.3W mb=5.2  EMSC   GUERRERO, MEXICO             

P: 11AUG2017 109402    17.0N  100.0W 3.5-5.1 CAAAA  Oaxaca, Mexico             

P: 18AUG2017 109674    16.0N  100.0W 3.5-5.2 AAAAA  Oaxaca, Mexico             

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: 17AUG2017 07:38:33  25.9N   94.5E mb=4.6  EMSC   MYANMAR-INDIA BORDER REGION  

P: 21AUG2017 109687    26.0N   93.0E 4.0-5.4 BAAAA  Myanmar                    

 

NEIC reported this earthquake of M 4.6 in Assam, India was felt with intensity II-III in the area(s) of Amguri and North Guwahati, Assam, India.

 

O: 17AUG2017 03:52:32  26.6N   95.4E ML=3.8  EMSC   MYANMAR-INDIA BORDER REGION  

P: 18AUG2017 109687    27.0N   97.0E 4.0-5.6 AAAAA  Myanmar                    

 

O: 18AUG2017 06:20:31  55.6N  166.3E mb=4.8  EMSC   KOMANDORSKIYE OSTROVA REGION 

P: 16AUG2017 109805    55.0N  169.0E 4.0-5.8 AABAA  Near Islands               

 

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

 

INDONESIA AND PHILIPPINES

 

O: 17AUG2017 04:04:02   2.7N  128.5E mb=4.3  EMSC   HALMAHERA, INDONESIA         

P: 14AUG2017 109626     3.0N  128.0E 4.0-5.6 BAAAA  Halmahera                  

 

O: 18AUG2017 00:12:13   5.3S  123.5E ML=4.0  EMSC   BANDA SEA                    

P: 13AUG2017 109632     6.0S  125.0E 4.0-5.4 BABAA  Banda Sea                  

 

O: 17AUG2017 06:49:30   6.3S  127.9E mb=4.4  EMSC   BANDA SEA                    

P: 20AUG2017 109635     4.0S  129.0E 4.0-5.5 BCAAA  Ceram area                 

 

CENTRAL AND SOUTH AMERICA

 

O: 17AUG2017 21:03:51   6.8N   73.2W Mw=4.2  EMSC   NORTHERN COLOMBIA            

P: 21AUG2017 109624     7.0N   73.0W 4.0-5.8 BAAAA  Colombia                   

 

O: 18AUG2017 00:53:53  15.5S   71.3W mb=4.4  EMSC   SOUTHERN PERU                

P: 14AUG2017 109834    15.0S   71.0W 4.0-5.7 BAAAA  Central Peru               

 

O: 18AUG2017 05:58:06  16.8N  100.4W ML=4.1  EMSC   OFFSHORE GUERRERO, MEXICO    

O: 17AUG2017 02:43:54  16.5N   99.0W ML=4.1  UNAM  l SURESTE de SAN MARCOS, GRO *: 16

O: 17AUG2017 16:03:21  16.9N   99.8W ML=4.0  UNAM   NORESTE de ACAPULCO, GRO *: 16.92

O: 18AUG2017 05:58:06  16.8N  100.4W ML=4.1  UNAM  l SUROESTE de COYUCA DE BENITEZ, G

O: 18AUG2017 05:15:11  16.8N  100.4W ML=5.3  UNAM  l SUR de ATOYAC DE ALVAREZ, GRO *:

O: 17AUG2017 16:03:21  16.9N   99.8W ML=4.0  EMSC   GUERRERO, MEXICO             

O: 18AUG2017 05:15:14  17.0N  100.3W mb=5.2  EMSC   GUERRERO, MEXICO             

P: 11AUG2017 109402    17.0N  100.0W 3.5-5.1 CAAAA  Oaxaca, Mexico             

P: 18AUG2017 109674    16.0N  100.0W 3.5-5.2 AAAAA  Oaxaca, Mexico             

 

O: 18AUG2017 00:19:44  18.4N   68.8W MD=3.6  EMSC   DOMINICAN REPUBLIC           

P: 19AUG2017 109677    18.0N   69.0W 3.4-5.1 AAAAA  Puerto Rico                

 

NEIC reported this earthquake of M 3.6 in the Dominican Republic was felt with intensity II-III in the area(s) of Puerto Plata, Dominican Republic.

 

O: 18AUG2017 04:22:33  18.6N   64.7W MD=3.2  EMSC   VIRGIN ISLANDS REGION        

P: 19AUG2017 109664    19.0N   64.0W 3.0-5.1 AAAAA  Leeward Islands            

 

O: 17AUG2017 23:12:02  18.6N  103.1W ML=4.0  EMSC   MICHOACAN, MEXICO            

O: 17AUG2017 23:12:02  18.6N  103.1W ML=4.0  UNAM  l SURESTE de COALCOMAN, MICH *: 18

P: 13AUG2017 109669    18.0N  104.0W 3.5-5.3 BAAAA  Michoacan, Mexico          

 

O: 17AUG2017 20:34:12  18.7N  106.9W ML=4.1  EMSC   OFF COAST OF JALISCO, MEXICO 

O: 17AUG2017 20:34:12  18.6N  106.8W ML=4.1  UNAM  al SUROESTE de CIHUATLAN, JAL *: 1

P: 12AUG2017 109658    19.0N  107.0W 3.5-5.3 BAAAA  Coast of Jalisco, Mexico   

 

O: 18AUG2017 01:36:12  19.0N   66.8W MD=3.0  EMSC   PUERTO RICO REGION            

O: 17AUG2017 14:27:03  19.5N   67.9W MD=3.2  EMSC   DOMINICAN REPUBLIC REGION    

P: 15AUG2017 109677    19.0N   66.0W 3.4-5.1 AABAA  Puerto Rico                

P: 19AUG2017 109677    18.0N   69.0W 3.4-5.1 ABAAA  Puerto Rico                

 

O: 17AUG2017 19:07:46  22.8S   66.7W ML=4.3  EMSC   JUJUY, ARGENTINA             

P: 13AUG2017 109846    22.0S   68.0W 4.0-5.6 BAAAA  Argentina                  

 

 

O: 17AUG2017 01:34:35  14.4N   93.8W ML=4.0  UNAM  al SUROESTE de MAPASTEPEC, CHIS

P: 15AUG2017 109656    14.0N   93.0W 3.5-5.4 AAAAA  Chiapas, Mexico            

 

O: 17AUG2017 01:02:39  15.5N   95.8W ML=4.4  UNAM  l SURESTE de CRUCECITA, OAX *:

P: 12AUG2017 109675    17.0N   96.0W 3.5-5.5 BBAAA  Oaxaca, Mexico             

 

AFRICA AND EUROPE

 

O: 18AUG2017 03:46:48  34.7N   24.0E ML=4.1  EMSC   CRETE, GREECE                

P: 20AUG2017 109695    35.0N   24.0E 3.0-4.8 AAAAA  Aegean Sea                 

 

O: 18AUG2017 04:30:02  37.6N   37.5E ML=4.3  EMSC   CENTRAL TURKEY               

P: 18AUG2017 109756    38.0N   39.0E 3.5-5.3 AAAAA  Turkey                     

 

O: 17AUG2017 09:06:56  39.0N    9.1W ML=2.0  EMSC   PORTUGAL                     

O: 17AUG2017 06:44:56  39.0N    9.1W mb=4.2  ANSS   Arruda dos Vinhos Portugal

O: 17AUG2017 06:44:56  39.1N    9.0W mb=4.2  EMSC   PORTUGAL                     

P: 21AUG2017 109719    39.0N    8.0W 3.5-4.9 BAAAA  Morocco/Spain              

 

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

 

SOUTHWEST PACIFIC

 

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

 

OCEAN RIDGES

 

O: 18AUG2017 02:59:25   1.2S   13.7W Mw=6.6  EMSC   NORTH OF ASCENSION ISLAND    

O: 18AUG2017 02:59:21   1.1S   13.6W mw=6.6  ANSS   North of Ascension Island"

O: 17AUG2017 08:52:24   5.7S   12.5W mb=5.1  EMSC   ASCENSION ISLAND REGION      

P: 14AUG2017 109634     1.0S   16.0W 4.0-5.6 BABAA  Central Mid-Atlantic       

 

 

ZEALANDIA AND AUSTRALIA REGION

 

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

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

 

JAPAN AND KURIL ISLANDS

 

O: 18AUG2017 03:10:06  38.6N  142.1E mb=4.6  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 18AUG2017 109729    39.0N  141.0E 4.0-5.6 AAAAA  Off East Coast Honshu      

 

O: 17AUG2017 13:19:29  44.1N  146.6E mb=4.2  EMSC   KURIL ISLANDS                

P: 20AUG2017 109790    45.0N  146.0E 3.5-5.6 BAAAA  So. Kurils                 

 

O: 17AUG2017 12:27:13  46.0N  149.7E mb=4.1  EMSC   KURIL ISLANDS                 

P: 18AUG2017 109791    47.0N  153.0E 3.5-5.8 AACAA  So. Kurils                 

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 17AUG2017 21:13:32  31.6N  115.9W ML=3.1  EMSC   BAJA CALIFORNIA, MEXICO      

P: 19AUG2017 109735    32.8N  116.0W 2.5-4.5 ABAAA  So. California             

 

O: 18AUG2017 05:21:54  33.5N  116.6W ML=2.4  EMSC   SOUTHERN CALIFORNIA          

O: 17AUG2017 14:10:55  34.0N  116.8W ML=3.1  EMSC   SOUTHERN CALIFORNIA          

P: 19AUG2017 109738    33.9N  116.9W 2.5-4.6 AAAAA  So. California             

 

NEIC reported this earthquake of M 3.1 in Southern California was felt with intensity II-III in the area(s) of Banning, Forest Falls, Beaumont, Yucaipa, Idyllwild, San Jacinto, Palm Springs, Hemet, Rancho Mirage, Winchester, Riverside, Menifee, Fallbrook, San Clemente, California and in general within about 50 km of the epicenter.

 

O: 17AUG2017 06:35:19  34.2N  117.4W ML=2.0  EMSC   GREATER LOS ANGELES AREA, CALI

P: 19AUG2017 109739    33.8N  117.7W 2.5-4.6 AAAAA  So. California             

 

O: 17AUG2017 22:30:47  37.0N  121.5W MD=2.5  EMSC   CENTRAL CALIFORNIA           

P: 17AUG2017 109704    37.2N  122.1W 2.5-4.6 AAAAA  Central California         

 

O: 18AUG2017 00:30:34  37.5N  118.8W MD=2.0  EMSC   CENTRAL CALIFORNIA           

P: 14AUG2017 109700    37.6N  118.7W 2.5-4.4 BAAAA  California/Nevada area     

 

O: 17AUG2017 22:28:34  38.6N  119.5W ML=2.2  EMSC   CENTRAL CALIFORNIA           

O: 17AUG2017 22:28:34  38.6N  119.5W ML=2.2  EMSC   CENTRAL CALIFORNIA            

P: 19AUG2017 109701    38.3N  119.3W 2.5-4.7 AAAAA  California/Nevada area     

 

O: 18AUG2017 05:28:52  39.5N  121.9W MD=2.3  EMSC   NORTHERN CALIFORNIA          

P: 18AUG2017 109707    39.6N  123.4W 2.5-4.6 AABAA  Central California         

 

O: 17AUG2017 20:11:04  40.3N  116.2W ml=2.6  EMSC   NEVADA                       

P: 10AUG2017 109485    40.0N  117.9W 2.5-4.5 CABAA  California/Nevada area     

 

O: 18AUG2017 04:48:15  40.5N  122.1W MD=2.0  EMSC   NORTHERN CALIFORNIA          

P: 21AUG2017 109781    40.7N  122.3W 2.5-4.4 BAAAA  Northern California        

 

 

ALASKA

 

O: 18AUG2017 01:17:00  51.3N  178.8E mb=4.9  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 18AUG2017 109809    52.0N  179.0E 4.0-5.6 AAAAA  Rat Islands                

 

O: 18AUG2017 04:44:36  59.0N  136.4W ML=4.0  EMSC   SOUTHEASTERN ALASKA          

P: 19AUG2017 109812    59.0N  138.0W 3.0-4.4 AAAAA  Southeast Alaska           

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 17AUG2017 10:39:52  47.5N  121.8W MD=2.6  EMSC   WASHINGTON                   

P: 21AUG2017 109794    46.9N  122.0W 2.0-4.1 BAAAA  Washington state, U.S.     

 

O: 17AUG2017 08:06:06  47.6N  120.3W MD=2.5  EMSC   WASHINGTON                   

P: 16AUG2017 109794    47.7N  120.3W 2.0-4.1 AAAAA  Washington state, U.S.     

 

ROCKY MOUNTAINS REGION

 

O: 17AUG2017 08:40:03  38.1N  112.7W ML=2.3  EMSC   UTAH                         

P: 18AUG2017 109757    38.7N  112.6W 2.0-4.2 AAAAA  Utah area                  

 

O: 17AUG2017 08:14:12  44.8N  111.0W ML=2.3  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P: 15AUG2017 109795    44.2N  110.3W 2.0-3.9 AAAAA  Yellowstone/Wyoming        

 

O: 17AUG2017 11:51:58  46.1N  111.4W ML=2.8  EMSC   WESTERN MONTANA              

P: 19AUG2017 109775    46.7N  112.1W 2.0-4.4 AAAAA  Montana/Idaho              

 

NEIC reported this earthquake of M 2.8 in Montana was felt with intensity II-III in the area(s) of Clancy, Montana.

 

O: 17AUG2017 16:49:06  38.3N  108.9W md=1.9  ANSS   Dove Creek Colorado          

O: 17AUG2017 14:31:00  38.3N  108.9W ml=1.2  ANSS   Dove Creek Colorado          

P: 14AUG2017 109709    38.9N  107.5W 2.0-4.2 BAAAA  Colorado area              

 

EASTERN U.S./CANADA

 

O: 18AUG2017 08:05:48  34.7N   95.9W mb=2.4  EMSC   OKLAHOMA                     

O: 18AUG2017 08:07:28  34.7N   95.9W mb=2.5  EMSC   OKLAHOMA                     

P: 19AUG2017 109753    35.0N   96.0W 2.0-4.1 AAAAA  Southern Plains            

 

O: 18AUG2017 05:25:20  36.5N   98.8W mb=2.7  EMSC   OKLAHOMA                     

P: 18AUG2017 109752    37.0N   98.0W 2.0-4.1 AAAAA  Southern Plains            

 

O: 18AUG2017 01:26:42  47.0N   66.5W mb=2.5  EMSC   NEW BRUNSWICK, CANADA        

O: 18AUG2017 01:26:42  47.0N   66.5W mb=2.5  ANSS   W of Miramichi Canada

P: 15AUG2017 109766    46.0N   66.0W 2.0-3.9 BAAAA  E. of Maine                

 

NEIC reported this earthquake of M 2.5 in New Brunswick, Canada was felt with intensity II-III in the area(s) of Halifax, Nova Scotia, Canada.

 

O: 17AUG2017 07:46:15  47.4N   75.3W ML=2.3  NRCA  76 km N from Ferme-Neuve      

P: 19AUG2017 109778    46.0N   75.0W 2.0-4.4 ABAAA  New York State             

 

O: 17AUG2017 01:58:34  46.3N   78.9W ML=1.5  NRCA  15 km W from Mattawa          

P: 11AUG2017 109510    46.0N   81.0W 2.0-3.9 CABAA  Ohio/Lake Erie              

 

HAWAII

 

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

 

MODERATELY STRONG QUAKE SHAKES RYUKYU ISLANDS, JAPAN

 

EARTHQUAKE SUMMARY FOR AUGUST 16, 2017

 

A moderately strong earthquake of M 5.7 was widely felt in the Ryukyu Islands of Japan today. NEIC reported it was felt with intensity II-III in Okinawa at Nago, Ishikawa, Yomitan, Gushikawa, Okinawa, Chatan, Ginowan, Urasoe,  and Nana, Japan. This is probably related to stresses from Typhoon Noru which passed over this epicenter last week. This level of activity in the Ryukyu Islands had been

expected at this time in this report:

 

Super -"Typhoon Noru continued today over Kyushu, Japan with winds up to 080 kts. It is expected to continue on the unusual track to the south of Honshu. Seismicity in the region of Kyushu, the Ryukyu Islands and Honshu may include a moderate to large event as Noru passes through the region." (August 7-10, 2017)

 

and

 

"... lessening of normal friction along the subduction zone under Honshu as the island rises with lessened atmospheric pressure load. Seismicity in the region of  Honshu may include a moderate to large event as Noru passes through the region. A moderate seismic watch for the area is in effect through August 11." (August 7-8, 2017)

 

Two earthquakes of M>=5.7 have hit the Ryukyu Islands during 2007 - an M 6.1 on May 9 and an M 5.9 on July 26 but none have occurred within 200 km of this epicenter this year. The last earthquake of M>=5.7 within about 200 km of this epicenter was an M 6.0 on September 26, 2016 and prior to that an M 5.8 on October 22, 2014.  Forecast 109691 had expected a moderate event in this region was likely around August 18.

 

O: 16AUG2017 12:51:24  28.8N  127.9E Mw=5.7  EMSC   NORTHWEST OF RYUKYU ISLANDS  

P: 18AUG2017 109691    27.0N  127.0E 4.0-5.4 ABAAA  Ryukyu Islands             

 

An M 3.6 in Hawaii today was felt with intensity III in Keaau, Honokaa and Kamuela, Hawaii. The last event in Hawaii of M>=3.6 was an M 4.2 on July 30, 2017. Forecast 109662 expected a moderate event in Hawaii was likely around August 18.

 

NEIC reported an earthquake of M 2.9 in Hawaii was also felt with intensity II-III in the area(s) of Ookala, Laupahoehoe, Honokaa, Pepeekeo, Paauilo, Kamuela, and Princeville, Hawaii.

 

O: 16AUG2017 13:53:42  19.9N  154.6W ML=3.6  EMSC   HAWAII REGION, HAWAII        

O: 16AUG2017 13:53:42  19.9N  154.6W ml=3.6  ANSS   Hawaiian Paradise Park Hawaii

O: 16AUG2017 15:24:03  20.1N  155.3W ML=2.9  EMSC   HAWAII REGION, HAWAII        

P: 18AUG2017 109662    18.8N  155.2W 3.0-4.6 AAAAA  Hawaii                     

 

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: 17AUG2017 03:52:32  26.6N   95.4E ML=3.8  EMSC   MYANMAR-INDIA BORDER REGION  

P: 18AUG2017 109687    27.0N   97.0E 4.0-5.6 AAAAA  Myanmar                    

 

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

 

INDONESIA AND PHILIPPINES

 

O: 17AUG2017 02:18:49   1.4N  126.3E mb=4.8  EMSC   MOLUCCA SEA                  

P: 20AUG2017 109627     2.0N  126.0E 4.0-5.6 BAAAA  Mindanao, Philippines      

 

O: 17AUG2017 04:04:01   2.8N  128.5E ML=4.3  EMSC   HALMAHERA, INDONESIA         

P: 14AUG2017 109626     3.0N  128.0E 4.0-5.6 BAAAA  Halmahera                   

 

O: 16AUG2017 05:38:11   6.9S  129.7E mb=4.3  EMSC   BANDA SEA                    

P: 17AUG2017 109653     7.0S  131.0E 4.0-5.6 AAAAA  West Irian, PNG            

 

O: 16AUG2017 07:23:47  11.4N  139.0E mb=4.8  EMSC   STATE OF YAP, MICRONESIA      

P: 18AUG2017 109678    11.0N  144.0E 4.0-5.7 AACAA  So. Marianas/Guam          

 

CENTRAL AND SOUTH AMERICA

 

O: 16AUG2017 10:29     13.3S   76.6W mb=3.9  IGP    Tambo de Mora, Chincha, Peru.

P: 18AUG2017 109833    13.0S   77.0W 4.0-5.6 AAAAA  Central Peru               

 

IGP reported this earthquake was felt with intensity II in  Tambo de Mora, Chincha, Peru.

 

O: 16AUG2017 10:38:13   5.0N   78.4W Mw=3.4  EMSC   SOUTH OF PANAMA              

P:  6AUG2017 109348     5.0N   78.0W 4.0-5.9 CAAAA  Colombia                   

 

O: 16AUG2017 10:26:53  15.3N   93.3W ML=4.0  EMSC   OFFSHORE CHIAPAS, MEXICO     

O: 16AUG2017 10:26:53  15.3N   93.3W ML=4.0  UNAM  l SUR de PIJIJIAPAN, CHIS *: 15.33

P: 15AUG2017 109656    14.0N   93.0W 3.5-5.4 ABAAA  Chiapas, Mexico            

 

O: 16AUG2017 21:52:41  15.5N   95.7W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

O: 16AUG2017 19:37:45  15.5N   95.7W ML=4.0  UNAM  l SURESTE de CRUCECITA, OAX *: 15.

O: 16AUG2017 21:52:41  15.4N   95.7W ML=4.0  UNAM  l SURESTE de CRUCECITA, OAX *: 15.

O: 17AUG2017 01:02:39  15.5N   95.8W ML=4.4  UNAM  l SURESTE de CRUCECITA, OAX *: 15.

O: 17AUG2017 01:02:39  15.5N   95.8W ML=4.4  EMSC   OFFSHORE OAXACA, MEXICO      

O: 16AUG2017 19:37:45  15.6N   95.7W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

P: 12AUG2017 109675    17.0N   96.0W 3.5-5.5 BBAAA  Oaxaca, Mexico             

 

O: 16AUG2017 20:54:05  17.5N   99.6W ML=4.1  EMSC   GUERRERO, MEXICO             

O: 16AUG2017 20:54:05  17.4N   99.6W ML=4.1  UNAM  l SUROESTE de CHILPANCINGO, GRO *:

P: 13AUG2017 109676    18.0N   99.0W 3.5-5.2 BAAAA  Oaxaca, Mexico             

 

O: 16AUG2017 10:46:18  18.5N   68.4W MD=3.1  EMSC   MONA PASSAGE, DOMINICAN REPUBL

O: 17AUG2017 01:23:55  18.9N   68.2W MD=3.1  EMSC   DOMINICAN REPUBLIC REGION    

O: 16AUG2017 08:03:17  18.9N   68.4W MD=3.4  EMSC   DOMINICAN REPUBLIC REGION    

P: 19AUG2017 109677    18.0N   69.0W 3.4-5.1 BAAAA  Puerto Rico                

 

O: 16AUG2017 20:19:53  30.0S   71.9W ML=4.2  EMSC   OFFSHORE COQUIMBO, CHILE     

P: 14AUG2017 109862    30.0S   69.0W 4.0-5.6 AACAA  Coast Central Chile        

 

 

O: 16AUG2017 11:54:03  22.0S   67.3W mb=4.4  EMSC   POTOSI, BOLIVIA              

O: 16AUG2017 13:03:44  22.7S   66.2W mb=4.3  EMSC   JUJUY, ARGENTINA             

P: 13AUG2017 109846    22.0S   68.0W 4.0-5.6 BAAAA  Argentina                  

 

O: 16AUG2017 15:49:31  24.3S   67.1W mb=4.6  EMSC   SALTA, ARGENTINA             

P: 12AUG2017 109846    24.0S   67.0W 4.0-5.4 BAAAA  Argentina                  

 

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

 

AFRICA AND EUROPE

 

O: 16AUG2017 15:53:29  36.5N   24.7E mb=4.7  EMSC   SOUTHERN GREECE              

P: 20AUG2017 109695    35.0N   24.0E 3.0-4.8 BBAAA  Aegean Sea                 

 

NEIC reported this earthquake of M 5.1 in Greece was felt with intensity IV in Rethimnon, Greece and II-III in the area(s) of Khania, Ayia Marina, Hania; Gazion, Iraklioin, Nea Alikarnassos, Tilisos, Vasiliai and Stalis, Iraklion, Greece.

 

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

 

SOUTHWEST PACIFIC

 

O: 16AUG2017 22:35:52  20.4S  177.6W mb=4.5  EMSC   FIJI REGION                  

P: 12AUG2017 109856    20.0S  176.0W 4.0-5.6 BABAA  Tonga Islands              

 

O: 16AUG2017 15:35:26  22.2S  179.6W mb=4.5  EMSC   SOUTH OF FIJI ISLANDS        

P: 19AUG2017 109857    22.0S  180.0W 4.0-5.6 BAAAA  Tonga Islands              

 

OCEAN RIDGES

 

O: 16AUG2017 08:32:53   4.1N   32.4W mb=4.6  EMSC   CENTRAL MID-ATLANTIC RIDGE   

 

O: 16AUG2017 19:46:59  25.0S   13.5W mb=5.0  EMSC   SOUTHERN MID-ATLANTIC RIDGE  

P: 20AUG2017 109854    20.0S   12.0W 4.0-5.6 BCBAA  So. Mid-Atlantic Ridge     

 

O: 16AUG2017 23:49:25  80.4N  122.4E mb=4.7  EMSC   EAST OF SEVERNAYA ZEMLYA     

 

No significant (M>=5) or unusual earthquakes were reported on Ocean Ridges today.

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 16AUG2017 19:21:54  29.6S  176.2W mb=5.2  EMSC   KERMADEC ISLANDS REGION      

P: 18AUG2017 109850    29.0S  178.0W 4.0-5.8 AABAA  No. Kermadec Islands       

 

JAPAN AND KURIL ISLANDS

 

O: 16AUG2017 12:51:24  28.8N  127.9E Mw=5.7  EMSC   NORTHWEST OF RYUKYU ISLANDS  

P: 18AUG2017 109691    27.0N  127.0E 4.0-5.4 ABAAA  Ryukyu Islands             

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 16AUG2017 15:09:07  34.4N  116.5W ML=2.2  EMSC   SOUTHERN CALIFORNIA          

P: 21AUG2017 109740    34.3N  116.5W 2.5-4.5 BAAAA  So. California             

 

O: 16AUG2017 04:30:48  35.1N  118.3W ML=2.2  EMSC   SOUTHERN CALIFORNIA          

P: 17AUG2017 109743    35.6N  118.4W 2.5-4.6 AAAAA  So. California             

 

O: 16AUG2017 14:06:21  35.8N  121.1W MD=2.2  EMSC   CENTRAL CALIFORNIA           

P: 17AUG2017 109730    35.8N  121.3W 2.5-4.5 AAAAA  Off So. California         

 

O: 16AUG2017 17:48:34  37.5N  121.8W MD=2.4  EMSC   SAN FRANCISCO BAY AREA, CALIF.

P: 14AUG2017 109704    37.4N  121.8W 2.5-4.7 AAAAA  Central California         

 

O: 16AUG2017 23:15:52  37.1N  117.9W ML=2.3  EMSC   CENTRAL CALIFORNIA           

O: 16AUG2017 20:01:08  37.6N  117.9W ML=2.4  EMSC   NEVADA                       

O: 16AUG2017 16:42:08  37.6N  118.9W MD=2.7  EMSC   CENTRAL CALIFORNIA           

P: 14AUG2017 109700    37.6N  118.7W 2.5-4.4 AAAAA  California/Nevada area     

 

O: 16AUG2017 19:46:35  38.3N  118.7W ml=2.2  EMSC   NEVADA                       

P: 14AUG2017 109700    37.6N  118.7W 2.5-4.4 AAAAA  California/Nevada area     

P: 21AUG2017 109700    38.0N  118.8W 2.5-4.4 BAAAA  California/Nevada area     

 

O: 16AUG2017 16:45:55  38.8N  122.7W MD=2.4  EMSC   NORTHERN CALIFORNIA          

P: 17AUG2017 109705    38.7N  122.7W 2.5-4.7 AAAAA  Central California         

 

 

ALASKA

 

O: 16AUG2017 20:33:08  51.6N  178.4W ML=3.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 17AUG2017 109799    51.9N  179.8W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 16AUG2017 05:57:58  47.4N  122.7W MD=2.4  EMSC   SEATTLE-TACOMA AREA, WASHINGTO

P: 21AUG2017 109794    46.9N  122.0W 2.0-4.1 BAAAA  Washington state, U.S.     

 

ROCKY MOUNTAINS REGION

 

O: 16AUG2017 08:33:45  46.1N  110.3W ML=2.3  EMSC   WESTERN MONTANA              

P: 15AUG2017 109795    44.2N  110.3W 2.0-3.9 ABAAA  Yellowstone/Wyoming        

 

O: 16AUG2017 09:13:58  46.9N  112.5W ML=2.0  EMSC   WESTERN MONTANA               

O: 16AUG2017 18:04:37  46.9N  112.5W ML=2.2  EMSC   WESTERN MONTANA              

P: 14AUG2017 109796    46.4N  112.4W 2.0-4.2 AAAAA  Yellowstone/Wyoming        

 

EASTERN U.S./CANADA

 

O: 17AUG2017 03:52:31  36.1N   97.8W mb=3.4  EMSC   OKLAHOMA                      

P: 18AUG2017 109752    37.0N   98.0W 2.0-4.1 AAAAA  Southern Plains            

 

NEIC reported this earthquake of M 3.4 in Oklahoma was felt with intensity IV in Dover, and Enid, Oklahoma and II-III in the area(s) of Bison, Edmond and Oklahoma City, Oklahoma.

 

HAWAII

 

O: 16AUG2017 13:53:42  19.9N  154.6W ML=3.6  EMSC   HAWAII REGION, HAWAII        

O: 16AUG2017 13:53:42  19.9N  154.6W ml=3.6  ANSS   Hawaiian Paradise Park Hawaii

O: 16AUG2017 15:24:03  20.1N  155.3W ML=2.9  EMSC   HAWAII REGION, HAWAII        

P: 18AUG2017 109662    18.8N  155.2W 3.0-4.6 AAAAA  Hawaii