MODERATELY STRONG QUAKES UNDER MARIANA IS; ARGENTINA CONTINUE GLOBAL ACTIVATION

 

EARTHQUAKE SUMMARY FOR JULY 20, 2018

 

Moderately strong earthquakes shook the northern Mariana Islands and a deep hypocenter under Argentina with M 5.6-5.7 each today. These continued the sudden global seismic activation which began two days ago. The earthquake in the northern Mariana Islands of M 5.7 was reported by NEIC to have been felt with intensity IV in Garapan, Saipan and in Tinian, Guam, Mariana Islands. The last earthquake within about 200 km of this epicenter with M>=5.7 occurred on September 14, 2017. Both are likely aftershocks of an M 7.7 which hit the area on July 29, 2016. Forecast 118145 had expected today's event was likely around July 16 within about 50 km of the epicenter. It is likely this was promoted by strong typhoon which passed directly over this epicenter earlier this month as noted in previous issues of this summary:

 

"Super-Typhoon Maria (TS 10W) continued today over Guam with winds up to 150 kts. It is expected to track to the northwest passing over Guam as a typhoon on  July 5-6. This storm could trigger a moderate to large quake in the region of Guam and the southern Mariana Islands which are currently seeing seismicity at moderately high levels." (July 7, 2018)

 

This quake in the Northern Marianas occurred at the sixth node (60 degrees) from the great Gulf of Alaska quake and was likely promoted from that source.

 

O: 20JUL2018 23:56:07  18.5N  145.9E Mw=5.7  EMSC   PAGAN REG., N. MARIANA ISLANDS

P: 16JUL2018 118145    18.0N  146.0E 4.0-5.4 BAAAA  No. Marianas               

 

The earthquake in Argentina of M 5.6 was not widely felt on the surface due to its deep focus. It is located near the antipode of TD 13 and TS Ampil current strong storms in the Philippines and Ryukyu Islands and may have been promoted by microseisms from that activity. This is the strongest earthquake within about

300 km of this epicenter since an M 5.6 on March 25, 2018 about 150 km to the north and prior to that an M 5.8 on November 13, 2015 about 250 km to the southwest of today's epicenter.  Forecast 118299 had expected today's event was likely in mid-July. This epicenter is located at 106 degrees from the great Gulf of Alaska quake and at 101 degrees from Hawaii and may have been promoted from those sources. 

 

O: 20JUL2018 10:24:56  28.1S   63.2W Mw=5.6  EMSC   SANTIAGO DEL ESTERO, ARGENTINA

P: 15JUL2018 118299    28.0S   67.0W 4.0-5.8 BACAA  Argentina                  

 

An earthquake of M 2.6 was felt widely in the region of northwestern Missouri and Kansas today. NEIC reported intensity II-III in Missouri at Saint Joseph, Amazonia, Agency, Faucett, De Kalb, Rayville, Trenton, Kirsville, Salem, and in Kansas at Wathena, Troy, Overland Park. It was also reported lightly felt in Saline, Michigan and Park River, North Dakota. This may be related to the M 6.0 in the Alaska yesterday. Earthquakes in Nebraska and South Dakota often are associated with strong earthquakes in Alaska - before or after those events. This relation has been frequently noted in this summary.  This is a very unusual earthquake and may point to additional seismicity in the area of Missouri and the Dakotas. A series of earthquakes in central Nebraska over the past two weeks near Broken Bow was probably precursory to the strong earthquakes in Alaska of the past two days as previously suggested in this summary. The last earthquake within about 100 km of today's Missouri epicenter was an M 3.1 on March 23, 2007 and prior to that an M 3.0 on May 13, 1999. Forecast 118209 had expected a light quake in the area in mid-July. This area should be watched as it may also indicate a spreading of the Oklahoma/Kansas/Nebraska activity into an extended area of the central Plain States of the U.S.

 

O: 20JUL2018 22:46:49  39.8N   94.9W mb=2.6  EMSC   MISSOURI                     

P: 15JUL2018 118209    38.0N   99.0W 2.0-4.3 BBCAA  Southern Plains            

 

The strongest earthquake in the U.S. or Canada today occurred off the coast of Oregon with M 3.9. NEIC reported this earthquake of M 3.9 off the coast of Oregon  may have been felt with intensity II-III in the area(s) of Florence, Oregon. This earthquake is the strongest within about 200 km of this epicenter off the coast of Oregon with  M>=3.9 was an M 4.6 two months ago on May 24, 2018. Forecast 118236 had expected this event was likely in mid-July within this region.

 

O: 20JUL2018 11:04:04  43.9N  128.1W mb=3.9  EMSC   OFF COAST OF OREGON          

P: 16JUL2018 118236    44.3N  129.4W 3.0-4.6 BAAAA  Off Coast of Oregon        

P: 20JUL2018 118236    43.1N  126.5W 3.0-4.7 AABAA  Off Coast of Oregon        

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: 21JUL2018 05:18:18  36.3N   69.7E mb=4.8  EMSC   HINDU KUSH REGION, AFGHANISTAN

O: 20JUL2018 22:45:52  36.4N   71.1E mb=4.0  EMSC   HINDU KUSH REGION, AFGHANISTAN

P: 20JUL2018 118178    36.0N   71.0E 3.8-5.2 AAAAA  Hindu Kush/Pakistan        

 

NEIC reported this earthquake of M 4.8 in Afghanistan was felt with intensity II-III in the area(s) of Mahmoud Raqui, Kapisa, Afghanistan.

 

O: 20JUL2018 06:36:35  15.1N   96.7E ML=4.0  EMSC   NEAR SOUTH COAST OF MYANMAR  

P: 17JUL2018 118126    14.0N   94.0E 4.0-5.6 BBBAA  Andaman Islands            

 

O: 21JUL2018 00:40:34  35.0N   80.9E mb=4.6  EMSC   WESTERN XIZANG               

P: 20JUL2018 118216    30.0N   80.0E 3.8-5.3 ACAAA  Xizang                     

 

O: 21JUL2018 04:19:17  51.9N  159.2E mb=4.9  EMSC   OFF EAST COAST OF KAMCHATKA  

P: 18JUL2018 118258    51.0N  157.0E 4.0-5.9 BABAA  Kamchatka                  

 

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

 

INDONESIA AND PHILIPPINES

 

O: 20JUL2018 19:58:10   1.6S   99.9E Mw=5.2  EMSC   KEP. MENTAWAI REGION, INDONESI

O: 20JUL2018 19:58:07  01.8S  099.2E MS=5.4  BMG  Felt with intensity II-III

P: 19JUL2018 118108     2.0N  100.0E 4.0-5.4 ACAAA  So. Sumatera               

 

BMG reported this earthquake was felt with intensity II-III in Padang, Pariaman and Kep. Mentawai and I-II i Padang Panjang, Kukit Tinggi and Painan, Sumatra, Indonesia.

NEIC reported this earthquake of M 5.2 in Mentawai, Indonesia was felt with intensity V in Padang Pariaman, Sumatra and II-III in the area(s) of Padang, Sumatra, Indonesia.

 

O: 20JUL2018 12:03:19   2.5N  128.3E mb=4.6  EMSC   HALMAHERA, INDONESIA         

O: 20JUL2018 12:03:17  02.6N  128.3E MS=4.5  BMG  Felt with intensity II

P: 21JUL2018 118105     4.0N  127.0E 4.0-5.5 ABAAA  Halmahera                  

 

BMG reported this earthquake was felt with intensity II in Morotai Selatan, Maluku, Indonesia.

 

O: 20JUL2018 23:56:07  18.5N  145.9E Mw=5.7  EMSC   PAGAN REG., N. MARIANA ISLANDS

P: 16JUL2018 118145    18.0N  146.0E 4.0-5.4 BAAAA  No. Marianas               

 

O: 20JUL2018 18:32:53   3.5S  146.3E mb=4.8  EMSC   BISMARCK SEA                 

P: 16JUL2018 118120     5.0S  144.0E 4.0-5.5 BBBAA  Papua New Guinea           

 

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

 

CENTRAL AND SOUTH AMERICA

 

O: 20JUL2018 11:29     27.6S   70.3W mb=4.0  GUC    Atacama at Copiapo and Tierra

P: 18JUL2018 118299    29.0S   70.0W 4.0-5.7 ABAAA  Coast Central Chile        

 

CSN reported this earthquake was felt with intensity  V in  Atacama at Copiapo and Tierra Amarilla III in Caldera and II in Diego de Almagra, Chile.

 

O: 20JUL2018 09:26:20  13.7N   90.5W mb=4.3  EMSC   OFFSHORE GUATEMALA           

P: 15JUL2018 118133    14.0N   90.0W 3.5-5.2 BAAAA  Guatemala                  

P: 18JUL2018 118133    15.0N   91.0W 3.5-5.3 ABAAA  Guatemala                  

 

NEIC reported this earthquake of M 4.3 in Guatemala was felt with intensity II-III in the area(s) of San Miguel Duenas and Antigua Guatemala, Sacatepequez; Mixco and San Antonio Palopo, Solola, Guatemala.

 

O: 20JUL2018 15:34:42  15.3N   94.8W ML=4.1  EMSC   OFF COAST OF OAXACA, MEXICO  

O: 20JUL2018 23:33:45  16.1N   94.9W mb=4.0  EMSC   OFFSHORE OAXACA, MEXICO      

P: 18JUL2018 118129    17.0N   95.0W 3.5-5.4 AAAAA  Chiapas, Mexico            

 

O: 20JUL2018 08:05:55  16.3N   98.1W ML=4.0  EMSC   OAXACA, MEXICO               

O: 21JUL2018 01:29:40  16.3N   99.1W mb=4.7  EMSC   OFFSHORE GUERRERO, MEXICO    

P: 18JUL2018 118147    17.0N   99.0W 3.5-5.3 BAAAA  Oaxaca, Mexico             

 

O: 20JUL2018 17:42:04  17.8N   95.5W mb=4.6  EMSC   VERACRUZ, MEXICO             

P: 18JUL2018 118129    17.0N   95.0W 3.5-5.4 AAAAA  Chiapas, Mexico            

 

NEIC reported this earthquake of M 4.6 in Veracruz, Mexico was felt with intensity II-III in the area(s) of Nanchital and Martinez, Veracruz, Mexico.

 

O: 20JUL2018 22:02:31  18.2N   67.9W MD=3.2  EMSC   MONA PASSAGE, PUERTO RICO    

P: 21JUL2018 118148    18.0N   66.0W 3.4-5.1 AABAA  Puerto Rico                

 

O: 21JUL2018 00:50:53  19.6N   63.3W mb=4.4  EMSC   NORTH OF ANGUILLA, LEEWARD ISL

P: 20JUL2018 118151    20.0N   63.0W 3.0-4.6 AAAAA  Bahamas/No. Caribbean      

 

O: 20JUL2018 18:03:38  23.8S   67.3W ML=4.1  EMSC   ANTOFAGASTA, CHILE           

P: 17JUL2018 118298    24.0S   66.0W 4.0-5.5 BAAAA  Argentina                  

 

O: 20JUL2018 11:29:43  27.6S   70.3W ML=4.0  EMSC   ATACAMA, CHILE               

P: 18JUL2018 118299    29.0S   70.0W 4.0-5.7 ABAAA  Coast Central Chile        

 

O: 20JUL2018 10:24:56  28.1S   63.2W Mw=5.6  EMSC   SANTIAGO DEL ESTERO, ARGENTINA

P: 15JUL2018 118299    28.0S   67.0W 4.0-5.8 BACAA  Argentina                  

 

AFRICA AND EUROPE

 

O: 21JUL2018 00:18:16  40.4N   52.2E ML=3.9  EMSC   CASPIAN SEA, OFFSHR TURKMENIST

P: 20JUL2018 118223    40.0N   52.0E 4.0-5.5 AAAAA  Kazakhstan                 

 

O: 20JUL2018 06:28:34  64.6N   17.3W ML=3.3  EMSC   ICELAND                      

P: 17JUL2018 118275    66.0N   17.0W 3.0-4.4 BBAAA  Iceland area               

 

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

 

SOUTHWEST PACIFIC

 

O: 20JUL2018 12:32:01  10.3S  161.2E mb=5.0  EMSC   SOLOMON ISLANDS              

P: 13JUL2018 118291    10.0S  162.0E 4.0-5.4 CAAAA  No. of Santa Cruz Islands  

 

OCEAN RIDGES

 

O: 20JUL2018 16:19:22   0.8S   91.1W ML=3.4  EMSC   GALAPAGOS ISLANDS, ECUADOR   

O: 20JUL2018 19:20:46   0.8S   91.2W ML=3.0  EMSC   GALAPAGOS ISLANDS, ECUADOR   

O: 20JUL2018 15:45:48   0.9S   91.1W ML=3.7  EMSC   GALAPAGOS ISLANDS, ECUADOR   

P: 10JUL2018 117912     2.0N   85.0W 4.0-5.6 CCCAA  So. of Panama              

 

O: 20JUL2018 19:46:58   9.1S  109.7W mb=4.7  EMSC   CENTRAL EAST PACIFIC RISE    

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 21JUL2018 02:07:14  33.9S  179.2W mb=4.5  EMSC   SOUTH OF KERMADEC ISLANDS    

P: 21JUL2018 118320    33.0S  178.0W 4.0-5.4 AAAAA  So. Kermadec Islands       

 

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: 21JUL2018 03:25:34  35.2N  118.9W ML=2.8  EMSC   CENTRAL CALIFORNIA           

P: 19JUL2018 118202    35.3N  118.6W 2.5-5.1 AAAAA  So. California             

 

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

 

O: 20JUL2018 12:06:53  36.0N  120.1W MD=2.1  EMSC   CENTRAL CALIFORNIA           

O: 20JUL2018 14:59:29  36.1N  120.7W MD=2.1  EMSC   CENTRAL CALIFORNIA           

P: 20JUL2018 118173    37.2N  122.1W 2.5-4.6 ABAAA  Central California         

 

O: 20JUL2018 23:04:15  38.8N  122.4W MD=2.1  EMSC   NORTHERN CALIFORNIA          

P: 19JUL2018 118174    38.7N  122.7W 2.5-4.6 AAAAA  Central California         

 

O: 20JUL2018 22:50:50  39.4N  118.1W ML=2.2  EMSC   NEVADA                       

O: 21JUL2018 04:28:25  39.9N  117.9W ml=2.0  EMSC   NEVADA                       

P: 19JUL2018 118218    40.2N  119.6W 2.5-4.4 AAAAA  California/Nevada area     

 

O: 20JUL2018 12:29:22  40.4N  125.3W ML=3.0  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 16JUL2018 118234    40.3N  124.7W 2.5-4.4 BAAAA  Off Coast of No. Calif     

 

ALASKA

 

O: 20JUL2018 18:12:50  53.6N  169.5W ML=3.4  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P: 19JUL2018 118254    52.1N  171.3W 3.5-5.1 ABAAA  Andreanoff Isls, Aleutians 

 

O: 20JUL2018 20:46:28  56.4N  148.6W ML=3.6  EMSC   GULF OF ALASKA               

O: 20JUL2018 10:42:45  56.6N  148.7W Ml=3.0  EMSC   GULF OF ALASKA               

P: 17JUL2018 118252    55.0N  148.7W 3.5-4.9 BAAAA  Gulf of Alaska             

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 20JUL2018 11:04:04  43.9N  128.1W mb=3.9  EMSC   OFF COAST OF OREGON          

P: 16JUL2018 118236    44.3N  129.4W 3.0-4.6 BAAAA  Off Coast of Oregon        

P: 20JUL2018 118236    43.1N  126.5W 3.0-4.7 AABAA  Off Coast of Oregon        

 

O: 20JUL2018 21:35:19  48.1N  122.0W MD=2.4  EMSC   WASHINGTON                   

P: 19JUL2018 118247    47.5N  121.8W 2.0-4.1 AAAAA  Washington state, U.S.     

 

ROCKY MOUNTAINS REGION

 

O: 20JUL2018 11:38:46  30.9N  103.5W mb=2.4  EMSC   WESTERN TEXAS                

P: 19JUL2018 118193    32.6N  103.6W 2.0-4.0 AABAA  SW U.S.A                   

 

EASTERN U.S./CANADA

 

O: 20JUL2018 19:46:55  35.9N   97.3W mb=2.5  EMSC   OKLAHOMA                     

O: 20JUL2018 21:01:54  35.9N   97.3W mb=2.6  EMSC   OKLAHOMA                     

P: 19JUL2018 118208    36.0N   97.0W 2.0-4.0 AAAAA  Southern Plains             

 

NEIC reported this earthquake of M 2.6 in Oklahoma was felt with intensity V in Guthrie, Oklahoma and II-III in the area(s) of Coyle, Oklahoma. An earlier M 2.5 was felt with intensity IV in Guthrie and II in Coyle, Oklahoma. Strong tornadic activity was present at the time of these quakes.

 

O: 20JUL2018 22:46:49  39.8N   94.9W mb=2.6  EMSC   MISSOURI                     

P: 15JUL2018 118209    38.0N   99.0W 2.0-4.3 BBCAA  Southern Plains            

 

O: 19JUL2018 21:46:43  71.9N   70.6W ML=3.0  NRCA  175 km NW from Clyde River    

P: 20JUL2018 118280    71.0N   75.0W 2.5-3.9 AAAAA  Baffin/Davis Strait Canada 

 

HAWAII

 

O: 20JUL2018 20:43:12  19.4N  155.3W MD=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 20JUL2018 10:45:56  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 20JUL2018 14:43:07  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 20JUL2018 15:08:22  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 20JUL2018 18:50:58  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 20JUL2018 21:25:47  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 20JUL2018 22:02:39  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 20JUL2018 23:25:38  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 21JUL2018 02:32:40  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 21JUL2018 05:54:09  19.4N  155.3W ML=3.0  EMSC   ISLAND OF HAWAII, HAWAII

O: 20JUL2018 22:19:45  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 21JUL2018 00:12:49  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 21JUL2018 02:31:04  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 21JUL2018 05:56:05  19.4N  155.3W ML=3.1  EMSC   ISLAND OF HAWAII, HAWAII

O: 20JUL2018 19:46:25  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 21JUL2018 01:18:05  19.4N  155.3W ML=3.2  EMSC   ISLAND OF HAWAII, HAWAII

O: 20JUL2018 17:31:48  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 20JUL2018 18:51:58  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 20JUL2018 19:02:31  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 20JUL2018 22:17:52  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 21JUL2018 00:34:33  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 21JUL2018 00:36:06  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 21JUL2018 02:21:45  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 21JUL2018 02:28:43  19.4N  155.3W ML=3.3  EMSC   ISLAND OF HAWAII, HAWAII

O: 20JUL2018 23:16:24  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 21JUL2018 02:23:51  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 21JUL2018 03:17:02  19.4N  155.3W ML=3.4  EMSC   ISLAND OF HAWAII, HAWAII

O: 20JUL2018 20:29:34  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 21JUL2018 00:26:28  19.4N  155.3W ML=3.5  EMSC   ISLAND OF HAWAII, HAWAII

O: 20JUL2018 20:26:18  19.4N  155.3W ML=3.7  EMSC   ISLAND OF HAWAII, HAWAII

O: 21JUL2018 03:12:24  19.4N  155.3W ML=3.7  EMSC   ISLAND OF HAWAII, HAWAII

O: 21JUL2018 00:28:01  19.4N  155.3W ML=3.8  EMSC   ISLAND OF HAWAII, HAWAII     

P: 20JUL2018 118135    19.9N  156.1W 3.0-4.6 AAAAA  Hawaii