STRONG EARTHQUAKE IN FIJI CONTINUES GEOMAGNETIC TRIGGERING

 

EARTHQUAKE SUMMARY FOR AUGUST 18, 2017

 

The strongest earthquake of the day was an M 6.4 in the Fiji Islands. This event occurred at the tail end of a solar flare of C4+ class which began about 30 minutes earlier. This flare is the strongest in more than a month - since a C5.8 class event of July 15, 2017. As today's event occurred within a few  degrees of the geomagnetic equator at deep focus, it is likely, like the Atlantic M 6.6 yesterday, it was promoted by this and other flare activity which began late on August 18 (UT). This had been expected in the previous summary as:

 

"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." (August 18, 2017)

 

While a strong M 7.0 quake hit the area about 500 km southwest of today's epicenter on January 3, 2017 and again on February 24, 2017 an equal distance to the south with M 6.9, this is the strongest event within about 250 km of this epicenter with M>=6.4 since an M 6.9 on September 24, 2016 and prior to that an M 7.1 on November 1, 2014, both about 200 km south of this epicenter. The last nearer such event occurred as an M 6.4 on April 3, 2011. Forecasts 109844 and 110082 had expected this event within about 100 km of the epicenter was likely between August 18 and 22. This epicenter is at the fifth node (72 degrees) from the M 7.7 in the Komandorsky Islands of July 17 and  may have been promoted from that source.

 

O: 19AUG2017 02:00:51  17.9S  178.8W Mw=6.4  EMSC   FIJI REGION                  

O: 19AUG2017 02:00:52  18.0S  178.9W mw=6.4  ANSS   SE of Lambasa Fiji

P: 18AUG2017 109844    17.0S  179.0W 4.0-5.5 AAAAA  Tonga Islands              

P: 22AUG2017 110082    18.0S  180.0W 4.0-5.8 BAAAA  Tonga Islands              

 

An earthquake of M 4.8 hit the region of Puerto Rico today. NEIC reported it was felt with maximum intensity IV in Puerto Rico at San German, Yauco, Penuelas, Caguas, Canovanas, Trujillo Alto, Carolina, Bayamon (V), San Juan, Arecibo, Fort Buchanan, Guaynabo, and in general within about 100 km of the epicenter. Heightened seismicity had been expected for Puerto Rico at this time. In the August 15, 2017 report for example, it was noted:

 

"An unusually large M 4.4-4.6 earthquake, also possibly related to stresses from Hurricane Gert was also located, but not reported felt, in Puerto Rico and the U.S. Virgin Islands today. At M 4.6 or M 4.4 this event is the strongest in the Puerto Rico area since an M 4.7 on July 17, 2017 and the second largest in the Puerto Rico area this year. Forecast 109677 had expected  this event was likely within about 100 km of this epicenter around August 15. Some of the great earthquakes in the Puerto Rico Trench have occurred in mid-August so there is some increased danger at this time for the region of the long-overdue great quake. Seismic effects from Hurricane Gert in this area had been anticipated in this summary as early as August 11 as:" (August 15, 2017)

 

"A system is currently northeast of the Virgin Islands at 21N 63W and tracking to the Leeward Islands and could help trigger a moderate earthquake in this area where seismicity has been occurring in recent weeks." (August 11, 2017)

 

The last earthquake in Puerto Rico with M>=4.9 was an M 6.4 on January 13, 2014 and prior to that an M 5.3 on December 17, 2011.   Forecast 109931 had expected today's moderate event was likely around August 22.

 

O: 18AUG2017 20:12:57  18.9N   66.6W mb=4.9  EMSC   PUERTO RICO REGION           

P: 22AUG2017 109931    18.0N   67.0W 3.4-5.0 AAAAA  Puerto Rico                

 

The strongest earthquake in the U.S. or Canada was an M 3.3 in the area of the Grise Fiord in northern Canada. This is a remote area and this event may be related to unloading of ice in the area at the end of summer. The last earthquake within about 250 km of this epicenter reported by NRCA with M>=3.3 was an 4.6 on November 9, 2014 about 200 km west of today's epicenter. Similar events occurred on November 26, 2012 and January 7, 2002. Forecast 109830 had expected a regional event was possible around August 19.  

 

O: 18AUG2017 07:06:51  76.4N   88.4W ML=3.3  NRCA  145 km W from Grise Fiord     

O: 18AUG2017 07:06:51  76.4N   88.4W ML=3.3  NRCA  145 km W from Grise Fiord     

P: 19AUG2017 109830    80.0N   90.0W 4.0-5.4 ACAAA  Arctic Ocean Region        

 

The most widely felt earthquake in the U.S. today was an M 3.2 in southeastern Missouri in the New Madrid Fault zone.  This earthquake of M 3.2 was widely felt in the New Madrid region of Missouri and Tennessee today. NEIC reported maximum intensity V in Marston, Missouri and IV in New Madrid, Missouri. Lesser shaking of intensity II-III was felt in Missouri at Portageville, Wardell, Perryville, Saint Louis; in Arkansas at Little Rock, Pine Bluff, Paragould; also felt in Paducah Kentucky, in Tennessee at Cordova, Tiptonville, and possibly in Oak Grove, Louisiana. This is the strongest earthquake within the region this year. The last earthquake in the area of southeastern Missouri with M>=3.2 was an M 3.4 on September 9, 2016 and prior to that an M 3.3 on June 17, 2012. Earthquakes in Tennessee about 75 km northeast of this epicenter occurred on May 16, 2017 (M 3.3) and March 15, 2017 (M 3.6). Forecast 109721 had expected this event within about 10 km of the epicenter was likely around August 17. The coincidence of today's event with the solar eclipse two days away suggests stresses related to that event may have helped promote today's earthquake as suggested in previous issues of this summary:

 

"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." (August 17-18, 2017)

 

O: 18AUG2017 15:18:21  36.5N   89.6W MD=3.2  EMSC   SOUTHEASTERN MISSOURI        

O: 18AUG2017 15:18:21  36.4N   89.6W md=3.2  ANSS   ENE of Portageville Missouri

P: 17AUG2017 109721    36.5N   89.6W 2.0-4.1 AAAAA  New Madrid area            

 

An equally unlikely earthquake to the New Madrid event occurred today with M 2.4 in the area of Dover, Arkansas. It was not reported felt in the epicentral area. The last event of M>=2.4 within about 50 km of this epicenter occurred on  M 2.9 on July 28, 2016. Forecast 109751 had expected this earthquake was likely around August 21.

 

O: 18AUG2017 12:49:57  35.4N   93.1W MD=2.4  EMSC   ARKANSAS                     

O: 18AUG2017 12:49:57  35.4N   93.1W md=2.4  ANSS   4km NE of Dover

P: 21AUG2017 109751    34.0N   93.0W 2.0-4.1 BBAAA  Southeast U.S.             

 

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: 18AUG2017 10:18:43  31.7N   46.1E mb=4.7  EMSC   IRAQ                         

P: 12AUG2017 109747    32.0N   49.0E 3.8-5.6 CABAA  So. Iran                   

 

NEIC reported this earthquake of M 4.7 in Iraq was felt with intensity IV in the area(s) of Qal'at Sikar, Iraq.

 

O: 18AUG2017 19:53:12  36.6N   71.3E mb=4.3  EMSC   HINDU KUSH REGION, AFGHANISTAN

P: 19AUG2017 109712    36.0N   71.0E 3.8-5.4 AAAAA  Hindu Kush/Pakistan        

 

O: 18AUG2017 08:10:01  38.5N   73.3E mb=4.2  EMSC   TAJIKISTAN                   

P: 16AUG2017 109713    38.0N   74.0E 3.8-5.3 AAAAA  Hindu Kush/Pakistan        

 

O: 18AUG2017 09:19:28  44.5N   82.3E mb=4.6  EMSC   NORTHERN XINJIANG, CHINA     

P: 14AUG2017 109771    44.0N   83.0E 4.0-5.6 BAAAA  Kirgizstan/Xinjiang        

 

O: 19AUG2017 01:00:00  53.1N  159.8E mb=4.6  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 25AUG2017 110039    53.0N  160.0E 4.0-5.4 CAAAA  E. of Kamchatka            

 

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

 

INDONESIA AND PHILIPPINES

 

O: 19AUG2017 00:40:45   0.3S  125.7E mb=4.3  EMSC   MOLUCCA SEA                  

P: 20AUG2017 109627     1.0N  124.0E 4.0-5.5 ABBAA  Mindanao, Philippines      

 

O: 18AUG2017 16:49:50   6.2S  130.4E mb=4.3  EMSC   BANDA SEA                    

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

 

O: 18AUG2017 21:00:49   6.3S  128.1E Mw=5.4  EMSC   BANDA SEA                    

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

 

CENTRAL AND SOUTH AMERICA

 

O: 19AUG2017 03:22:31  10.6S   78.8W mb=4.6  EMSC   NEAR COAST OF CENTRAL PERU   

P: 19AUG2017 109832    10.0S   75.0W 3.5-5.0 AACAA  Brazil                     

P: 21AUG2017 109645     9.0S   81.0W 4.0-5.5 ABBAA  No. Peru                   

 

O: 18AUG2017 14:36:15  14.3S   72.6W mb=5.0  EMSC   CENTRAL PERU                 

P: 13AUG2017 109833    14.0S   73.0W 4.0-5.4 BAAAA  Central Peru               

 

O: 18AUG2017 09:38:40  14.5N   93.2W ML=4.0  EMSC   OFFSHORE CHIAPAS, MEXICO     

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

 

O: 19AUG2017 05:42:17  14.6N   90.7W mb=4.4  EMSC   GUATEMALA                    

P: 20AUG2017 109660    13.0N   90.0W 3.5-5.2 ABAAA  Guatemala                  

P: 22AUG2017 109913    14.0N   91.0W 3.5-5.3 BAAAA  Guatemala                  

 

O: 18AUG2017 09:38:40  14.4N   93.2W ML=4.0  UNAM  al SUROESTE de HUIXTLA, CHIS *: 14

O: 18AUG2017 10:41:25  15.0N   92.0W ML=4.0  EMSC   GUATEMALA                    

O: 18AUG2017 10:41:25  14.9N   92.0W ML=4.0  UNAM  l ESTE de CACAHOATAN, CHIS *: 14.9

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

 

O: 18AUG2017 22:30:15  15.9N   98.9W ML=4.4  EMSC   OFFSHORE GUERRERO, MEXICO    

O: 18AUG2017 22:30:15  15.8N   98.9W ML=4.4  UNAM  al SUROESTE de OMETEPEC, GRO *: 15

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

 

O: 18AUG2017 16:44:15  16.8N  100.4W ML=4.1  UNAM  l SUR de ATOYAC DE ALVAREZ, GRO *:

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: 18AUG2017 05:18:26  16.8N  100.5W ML=4.0  UNAM  l SUR de ATOYAC DE ALVAREZ, GRO *:

O: 19AUG2017 02:30:20  16.9N  100.5W ML=4.2  UNAM  l SUROESTE de ATOYAC DE ALVAREZ, G

O: 18AUG2017 16:44:15  16.8N  100.4W ML=4.1  EMSC   OFFSHORE GUERRERO, MEXICO    

O: 19AUG2017 02:30:20  16.9N  100.5W ML=4.2  EMSC   OFFSHORE GUERRERO, MEXICO    

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

 

O: 18AUG2017 20:12:57  18.9N   66.6W mb=4.9  EMSC   PUERTO RICO REGION           

P: 22AUG2017 109931    18.0N   67.0W 3.4-5.0 AAAAA  Puerto Rico                

 

O: 18AUG2017 06:45:15  19.0N   66.6W MD=3.1  EMSC   PUERTO RICO REGION           

P: 19AUG2017 109681    20.0N   65.0W 3.0-4.4 AABAA  Bahamas/No. Caribbean      

 

O: 18AUG2017 20:31:50  45.5S   76.6W Mw=5.1  EMSC   OFF COAST OF AISEN, CHILE    

P: 21AUG2017 109867    43.0S   83.0W 4.0-5.5 BCCAA  Chile Rise                  

 

 

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

 

AFRICA AND EUROPE

 

O: 18AUG2017 12:47:33  36.9N   27.6E mb=4.4  EMSC   DODECANESE IS.-TURKEY BORDER R

O: 18AUG2017 14:10:48  36.9N   27.7E ML=4.4  EMSC   DODECANESE IS.-TURKEY BORDER R

P: 18AUG2017 109696    36.0N   27.0E 3.0-4.6 AAAAA  Aegean Sea                 

 

NEIC reported this earthquake of M 4.2 in Western Turkey was felt with intensity II-III in the area(s) of Kos, Greece and Marmaris, Mugla, Turkey. 

 

O: 19AUG2017 03:16:01  81.2N    2.3W mb=4.7  EMSC   NORTH OF SVALBARD            

O: 19AUG2017 03:16:03  81.2N    2.0W mb=4.7  ANSS   E of Nord Greenland          

P: 21AUG2017 109827    79.0N    7.0E 4.0-5.6 ABAAA  Arctic Ocean Region        

 

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

 

SOUTHWEST PACIFIC

 

O: 18AUG2017 12:54:56   5.6S  153.1E mb=4.7  EMSC   NEW IRELAND REGION, P.N.G.   

P: 20AUG2017 109640     4.0S  152.0E 4.0-5.4 ABAAA  New Britain                 

 

O: 19AUG2017 02:00:51  17.9S  178.8W Mw=6.4  EMSC   FIJI REGION                  

O: 19AUG2017 02:00:52  18.0S  178.9W mw=6.4  ANSS   SE of Lambasa Fiji

P: 18AUG2017 109844    17.0S  179.0W 4.0-5.5 AAAAA  Tonga Islands              

P: 22AUG2017 110082    18.0S  180.0W 4.0-5.8 BAAAA  Tonga Islands              

 

O: 18AUG2017 11:01:22  20.2S  175.9W mb=4.4  EMSC   TONGA                        

P: 14AUG2017 109856    20.0S  174.0W 4.0-5.5 BABAA  Tonga Islands              

 

O: 18AUG2017 15:16:58  24.4S  179.7E mb=4.5  EMSC   SOUTH OF FIJI ISLANDS        

P: 19AUG2017 109857    23.0S  179.0E 4.0-5.7 ABAAA  Tonga/Fiji                 

 

OCEAN RIDGES

 

O: 18AUG2017 15:35:55   1.3S   14.7W mb=4.8  EMSC   NORTH OF ASCENSION ISLAND    

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 18AUG2017 18:52:23  29.8S  176.3W 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: 18AUG2017 10:53:50  26.0N  143.9E mb=4.7  EMSC   BONIN ISLANDS, JAPAN REGION  

P: 15AUG2017 109682    26.0N  144.0E 4.0-5.5 AAAAA  Bonin Islands              

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 18AUG2017 23:57:25  35.1N  118.3W ML=2.6  EMSC   SOUTHERN CALIFORNIA          

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

 

O: 18AUG2017 21:05:10  36.4N  114.9W ML=2.0  EMSC   NEVADA                       

 

O: 18AUG2017 16:06:31  34.2N  118.1W ML=2.0  EMSC   GREATER LOS ANGELES AREA, CALI

P: 19AUG2017 109737    33.9N  118.3W 2.5-4.6 AAAAA  So. California             

 

O: 19AUG2017 05:19:32  36.5N  121.1W MD=2.0  EMSC   CENTRAL CALIFORNIA           

P: 15AUG2017 109703    36.4N  121.0W 2.5-4.6 BAAAA  Central California         

 

O: 18AUG2017 15:44:40  37.6N  118.9W MD=2.6  EMSC   CENTRAL CALIFORNIA           

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

 

O: 19AUG2017 01:22:11  37.9N  118.5W ML=2.5  EMSC   CENTRAL CALIFORNIA           

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

 

O: 18AUG2017 14:36:28  38.1N  118.9W ML=2.9  EMSC   CENTRAL CALIFORNIA           

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

 

O: 18AUG2017 09:01:31  38.8N  122.8W MD=2.3  EMSC   NORTHERN CALIFORNIA          

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

 

ALASKA

 

O: 18AUG2017 11:44:46  60.8N  152.2W ML=3.1  EMSC   SOUTHERN ALASKA              

P: 20AUG2017 109816    61.3N  152.3W 3.2-5.0 AAAAA  Central Alaska             

 

O: 18AUG2017 09:22:33  62.0N  147.7W Ml=3.0  EMSC   CENTRAL ALASKA               

P: 22AUG2017 110054    61.0N  147.7W 3.2-5.1 BAAAA  Central Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 19AUG2017 00:30:50  47.6N  120.3W MD=2.6  EMSC   WASHINGTON                   

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

 

ROCKY MOUNTAINS REGION

 

O: 18AUG2017 15:30:03  35.0N  104.4W mb=2.8  EMSC   NEW MEXICO                   

O: 18AUG2017 15:30:03  35.0N  104.3W mb=2.8  ANSS   Santa Rosa New Mexico

P: 15AUG2017 109734    35.4N  101.8W 2.0-4.0 BACAA  SW U.S.A                   

P: 17AUG2017 109732    32.6N  104.6W 2.0-4.3 ACAAA  SW U.S.A                   

 

EASTERN U.S./CANADA

 

O: 18AUG2017 12:49:57  35.4N   93.1W MD=2.4  EMSC   ARKANSAS                     

O: 18AUG2017 12:49:57  35.4N   93.1W md=2.4  ANSS   4km NE of Dover

P: 21AUG2017 109751    34.0N   93.0W 2.0-4.1 BBAAA  Southeast U.S.             

 

O: 18AUG2017 21:54:10  36.3N   97.0W mb=2.7  EMSC   OKLAHOMA                     

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

P: 25AUG2017 109995    36.0N   97.0W 2.0-4.2 CAAAA  Southern Plains            

 

NEIC reported this earthquake of M 2.7 in Central Oklahoma was felt with intensity II-III in the area(s) of Morrison, Oklahoma.

 

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 15:18:21  36.5N   89.6W MD=3.2  EMSC   SOUTHEASTERN MISSOURI        

O: 18AUG2017 15:18:21  36.4N   89.6W md=3.2  ANSS   ENE of Portageville Missouri

P: 17AUG2017 109721    36.5N   89.6W 2.0-4.1 AAAAA  New Madrid area            

 

O: 18AUG2017 01:26:42  47.0N   66.6W ML=2.9  NRCA  59 km E from Plaster Rock     

P: 21AUG2017 109773    47.0N   69.0W 2.0-3.9 BABAA  Maine                      

 

O: 18AUG2017 07:06:51  76.4N   88.4W ML=3.3  NRCA  145 km W from Grise Fiord     

O: 18AUG2017 07:06:51  76.4N   88.4W ML=3.3  NRCA  145 km W from Grise Fiord      

P: 19AUG2017 109830    80.0N   90.0W 4.0-5.4 ACAAA  Arctic Ocean Region        

 

HAWAII

 

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