MODERATE SEISMICITY TRIGGERED BY STRONG TROPICAL CYCLONES

 

EARTHQUAKE SUMMARY FOR JULY 22, 2014

 

Earthquakes in Assam, India of M 4.0-4.5) and in Guam, Mariana Islands (M 5.0-5.3) today appear to have been triggered by Typhoon Matmo and by a tropical cyclone respectively. Matmo was making landfall on the island of Taiwan and eastern  China when the series of three earthquakes hit near Dhuburi, Assam, India. While some distance from the landfall event, previous observations have demonstrated that seismicity in southeast Asia is often triggered by landfall of typhoons  such as this at some distance from the storm. The earthquake in Guam, the largest of the day occurred just at the eye of the tropical cyclone was passing over that epicenter and, given the long history of cyclone-triggered seismicity in Guam, was probably triggered by that storm.

 

NEIC reported the earthquakes in Assam, India of M 4.2 and 4.5 wre felt with intensity III in Bijni, Assam, India.  A great earthquake may be approaching in the region of Assam, India. Foreshock sequences such as this may help locate the most likely initiating rupture for such an events. Forecast 81934 had expected this activity was likely within about 100 km of this epicenter around July 23 but a stronger regional event is still possible in this sequence. The last earthquake of M>=4.2 within 200 km of this epicenter occurred on December 4, 2013. This summary had noted the occurrence of possible seismicity related to Typhoon Matmo as follows:

 

"Typhoon Matmo (10W) continued over Tawian today with winds up to 85 kts. A seismic watch is being called for Taiwan beginning on July 22 and lasting  through July 26. A moderate to large quake may occur in this region in this time period." (July 20-21, 2014)

 

O: 22JUL2014 23:35:14  26.1N   89.6E mb=4.0  ANSS   E of Dinhata India           

O: 22JUL2014 20:54:41  26.1N   89.9E ML=3.8  IMD  Dhuburi, Assam

O: 22JUL2014 22:58:28  26.3N   89.8E ML=4.4  IMD  Dhuburi, Assam

O: 22JUL2014 23:25:13  26.3N   89.8E ML=4.2  IMD  Dhuburi, Assam

O: 22JUL2014 22:58:31  26.2N   89.7E mb=4.2  ANSS   S of Tufanganj India         

P: 23JUL2014 81934     27.0N   88.0E 3.5-5.4 AABAA  Nepal                      

 

A moderate earthquake of M 5.0-5.3 occurred in the area south of Guam at Merizo Village today. This was the strongest earthquake in the world since the last summary. It was not widely reported felt but is of some interest because a tropical cyclone as passing through the epicenter at the time of the earthquake. This summary had noted this in the previous issue as follows:

 

"A new tropical storm may be forming south of Guam, Marianas. This storm  is located about 50 km south of Guam and is located at 12.6N 142.4E with winds up to 22 kts. A moderate seismic watch for the southern Mariana Islands is in effect through July 26." (July 22, 2014)

 

The last earthquake of M>=5 in Guam at shallow depths occurred on September 22, 2013 with M 5.0 The last of M>5.3 was an M 5.9 on September 11, 2012.  Both of these were closely associated with passing typhoons as noted for example in this summary:

 

"Typhoon Pabuk formed near this epicenter three days ago and likely had a triggering effect here as it did in the past two days in northern Marianas and Rota regions of the Marianas." (September 23, 2013)

 

Forecast 81921 had expected this activity around July 27 in Guam.

 

O: 22JUL2014 10:49:56  12.0N  142.4E mb=5.0  ANSS   Merizo Village Guam          

O: 22JUL2014 10:49:53  12.0N  142.5E ML=5.3  GSR  South of Mariana  Islands

P: 27JUL2014 81921     12.0N  145.0E 4.0-5.6 BABAA  So. Marianas/Guam          

 

A series of moderate earthquakes including an M 5.0 and 4.5 hit the Guerrero region of Mexico today. This followed moderate seismicity in the Gulf of California of M 4.1-4.2 and M 4.6-4.8. The area of Mexico to the Gulf of California is often active in mid-June to July as strong tropical cyclones pass through the area. The closest storm at this time is TD 02 currently east of the Leeward Islands in the Caribbean. Tropical Storm Fausto passed the area last week and may have set in motion some of this activity.  

 

NEIC reported this earthquake of M 4.5 in Guerrero, Mexico was felt with intensity II-III in the area(s) of Mexico City, Mexico.  The M 5.0 was felt with intensity II in Mexico City and I in Chilapa, Guerrero, Mexico.

 

O: 22JUL2014 21:56:14  16.8N  100.1W mb=4.5  ANSS   Bajos del Ejido Mexico       

O: 23JUL2014 00:28:14  16.6N  100.5W ML=5.2  UNAM   SUROESTE de COYUCA DE BENITEZ, GRO 

O: 22JUL2014 21:56:08  16.4N  100.8W ML=4.6  UNAM   SUR de TECPAN, GRO 

O: 22JUL2014 01:25:18  16.8N  101.0W ML=3.9  UNAM   SUROESTE de TECPAN, GRO 

O: 23JUL2014 00:28:18  17.1N  100.2W ML=5.2  GSR  Guerrero, Mexico

O: 23JUL2014 00:28:19  16.9N  100.2W mb=5.0  ANSS   Coyuca de Benitez Mexico     

P: 20JUL2014 81682     18.0N  100.0W 3.5-5.1 BAAAA  Oaxaca, Mexico             

P: 25JUL2014 81918     16.0N  100.0W 3.5-5.3 AAAAA  Oaxaca, Mexico             

 

O: 22JUL2014 23:46:51  25.7N  110.4W mb=4.1  ANSS   ESE of Loreto Mexico         

O: 22JUL2014 23:46:52  26.0N  110.3W ML=4.2  UNAM    ESTE de LORETO, BCS 

O: 22JUL2014 06:50:29  25.7N  111.2W ML=4.6  UNAM   SURESTE de LORETO, BCS 

P: 22JUL2014 81689     25.0N  113.0W 3.5-4.9 AABAA  Gulf of California         

 

O: 22JUL2014 06:50:31  26.1N  110.1W mb=4.8  ANSS   Higuera de Zaragoza Mexico   

P: 20JUL2014 81689     24.0N  109.0W 3.5-5.0 ABAAA  Gulf of 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: 22JUL2014 15:22:38  27.5N   57.3E mb=5.1  ANSS   NNE of Minab Iran            

P: 14JUL2014 81699     28.0N   57.0E 3.5-5.1 CAAAA  So. Iran/Persian Gulf      

 

O: 22JUL2014 08:01:54  26.8N   54.3E ML=4.2  EMS SOUTHERN IRAN                   

P: 31JUL2014 81938     28.0N   52.0E 3.5-5.1 CBBAA  So. Iran/Persian Gulf      

 

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

 

INDONESIA AND PHILIPPINES

 

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

 

CENTRAL AND SOUTH AMERICA

 

O: 22JUL2014 21:56:14  16.8N  100.1W mb=4.5  ANSS   Bajos del Ejido Mexico       

O: 23JUL2014 00:28:14  16.6N  100.5W ML=5.2  UNAM   SUROESTE de COYUCA DE BENITEZ, GRO 

O: 22JUL2014 21:56:08  16.4N  100.8W ML=4.6  UNAM   SUR de TECPAN, GRO 

O: 22JUL2014 01:25:18  16.8N  101.0W ML=3.9  UNAM   SUROESTE de TECPAN, GRO 

O: 23JUL2014 00:28:18  17.1N  100.2W ML=5.2  GSR  Guerrero, Mexico

O: 23JUL2014 00:28:19  16.9N  100.2W mb=5.0  ANSS   Coyuca de Benitez Mexico     

P: 20JUL2014 81682     18.0N  100.0W 3.5-5.1 BAAAA  Oaxaca, Mexico             

P: 25JUL2014 81918     16.0N  100.0W 3.5-5.3 AAAAA  Oaxaca, Mexico             

 

O: 22JUL2014 23:46:51  25.7N  110.4W mb=4.1  ANSS   ESE of Loreto Mexico         

O: 22JUL2014 23:46:52  26.0N  110.3W ML=4.2  UNAM    ESTE de LORETO, BCS 

O: 22JUL2014 06:50:29  25.7N  111.2W ML=4.6  UNAM   SURESTE de LORETO, BCS 

P: 22JUL2014 81689     25.0N  113.0W 3.5-4.9 AABAA  Gulf of California         

 

O: 22JUL2014 06:50:31  26.1N  110.1W mb=4.8  ANSS   Higuera de Zaragoza Mexico   

P: 20JUL2014 81689     24.0N  109.0W 3.5-5.0 ABAAA  Gulf of California         

 

 

O: 22JUL2014 06:33:53  13.9N   91.9W ML=3.8  UNAM   SURESTE de CD HIDALGO, CHIS 

O: 22JUL2014 07:59:14  14.6N   92.5W ML=3.3  UNAM   SUROESTE de CD HIDALGO, CHIS 

O: 22JUL2014 03:33:38  14.6N   92.7W ML=3.3  UNAM   SUROESTE de TAPACHULA, CHIS 

O: 22JUL2014 09:30:49  14.5N   92.7W ML=3.7  UNAM   SUROESTE de CD HIDALGO, CHIS 

O: 23JUL2014 00:21:54  14.4N   92.7W ML=4.1  UNAM   SUROESTE de CD HIDALGO, CHIS 

O: 22JUL2014 11:24:36  14.6N   92.8W ML=3.6  UNAM   SUROESTE de TAPACHULA, CHIS  

P: 21JUL2014 81667     14.0N   91.0W 3.5-5.1 AAAAA  Guatemala                   

 

O: 22JUL2014 03:55:31  16.7N   91.5W ML=3.9  UNAM   NORESTE de LAS MARGARITAS, CHIS 

P: 24JUL2014 81903     16.0N   93.0W 3.5-5.1 AAAAA  Chiapas, Mexico            

 

O: 22JUL2014 09:39:11  16.4N   96.4W ML=3.9  UNAM   ESTE de MIAHUATLAN, OAX      

O: 22JUL2014 02:00:16  15.9N   96.9W ML=3.2  UNAM   NORESTE de PUERTO ESCONDIDO, O

P: 20JUL2014 81680     16.0N   96.0W 3.5-5.1 AAAAA  Oaxaca, Mexico             

 

O: 22JUL2014 07:47:07  16.3N   98.3W ML=3.6  UNAM   OESTE de PINOTEPA NACIONAL, OA

P: 21JUL2014 81681     16.0N   99.0W 3.5-5.2 AAAAA  Oaxaca, Mexico             

 

AFRICA AND EUROPE

 

O: 22JUL2014 03:03:58  30.7N   31.8E mb=4.3  ANSS   Al Qurayn Egypt              

 

O: 22JUL2014 08:04:18  34.2N   26.1E mb=4.8  ANSS   Makry Gialos Greece          

O: 22JUL2014 08:04:17  34.3N   26.0E ML=5.0  GSR  Crete, Greece

P: 23JUL2014 81955     34.0N   25.0E 3.0-4.6 AAAAA  Crete                      

 

SOUTHWEST PACIFIC

 

O: 22JUL2014 14:11:15  20.3S  176.2W mb=5.0  ANSS   NW of Nuku`alofa Tonga        

O: 23JUL2014 00:27:00  20.5S  177.7W ML=5.3  AUS     Fiji Islands Region.

O: 22JUL2014 14:11:15  20.4S  176.0W ML=5.4  AUS     Tonga Islands.

O: 23JUL2014 00:27:01  20.6S  177.6W mb=5.0  ANSS   Ndoi Island Fiji             

P: 21JUL2014 81845     21.0S  177.0W 4.0-5.6 AAAAA  Tonga Islands              

 

OCEAN RIDGES

 

O: 23JUL2014 05:52:34   0.7N   67.1E MB=5.0  EMS CARLSBERG RIDGE                 

P: 18JUL2014 81642      2.0S   69.0E 4.0-5.4 BCBAA  Indian Ocean               

 

O: 22JUL2014 06:00:40   3.9S  103.2W ML=4.3  EMS CENTRAL EAST PACIFIC RISE       

P: 13JUL2014 81647      5.0S  105.0W 4.0-5.6 CBBAA  No. East Pacific Rise      

 

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

 

NEW ZEALAND AND AUSTRALIA REGION

 

O: 22JUL2014 06:12:57  30.7S  117.6E ML=2.4  AUS     Koorda, WA., AUSTRALIA

O: 22JUL2014 05:55:53  30.7S  117.6E ML=2.3  AUS     Koorda, WA., AUSTRALIA

O: 22JUL2014 05:23:36  30.6S  117.6E ML=2.3  AUS     Koorda, WA., AUSTRALIA

O: 22JUL2014 19:49:46  30.6S  117.7E ML=3.3  AUS     Koorda, WA., AUSTRALIA      

P: 20JUL2014 81849     30.0S  118.0E 2.0-3.4 AAAAA  Central Australia          

 

O: 23JUL2014 00:58:48  37.7S  144.9E ML=1.5  AUS     Campbellfield, North Melbourn

 

Geoscience Australia reported this M 2.0 earthquake near Melbourne was felt in a number of nearby suburbs including Craigieburn, Greenvale and Roxburgh Park near the epicenter. This is unusual as it was a shallow quake. It woke people from their sleep.

 

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

 

No earthquakes of M>=4 were located in Japan or the Kuril Islands today.

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 22JUL2014 08:35:04  31.6N  114.5W ml=2.9  ANSS   San Felipe Mexico            

O: 22JUL2014 08:34:51  31.7N  114.5W ml=2.5  ANSS   Estacion Coahuila Mexico     

P: 19JUL2014 81732     30.2N  114.1W 2.0-4.1 BBAAA  SW U.S.A                   

 

O: 22JUL2014 16:14:36  32.3N  115.3W ml=3.0  ANSS   Alberto Oviedo Mota Mexico   

O: 22JUL2014 16:14:36  32.3N  115.3W ML=3.0  NCSN    Calexico, CA

P: 17JUL2014 81733     32.0N  116.3W 2.5-4.4 BAAAA  So. California             

 

O: 22JUL2014 12:36:02  34.5N  118.0W ml=2.2  ANSS   SSW of Littlerock California 

O: 22JUL2014 12:36:02  34.5N  118.0W ML=2.2  NCSN    Palmdale, CA

P: 25JUL2014 81980     33.9N  118.3W 2.5-4.5 BAAAA  So. California             

 

O: 22JUL2014 15:34:36  35.8N  119.9W Md=2.6  ANSS   Kettleman City California    

O: 22JUL2014 15:34:36  35.8N  119.9W ML=2.6  NCSN    Kettleman City, CA

O: 22JUL2014 15:30:24  35.8N  119.9W ML=2.9  NCSN    Kettleman City, CA

O: 22JUL2014 15:30:24  35.8N  119.9W Md=2.9  ANSS   Kettleman City California    

P: 19JUL2014 81708     36.1N  120.1W 2.5-4.6 BAAAA  Central California         

 

O: 22JUL2014 09:45:09  36.7N  121.3W Md=2.8  ANSS   SSE of Ridgemark California  

O: 22JUL2014 09:45:09  36.7N  121.3W ML=2.8  NCSN    Tres Pinos, CA

O: 22JUL2014 07:11:06  36.7N  121.3W ML=2.9  NCSN    Tres Pinos, CA

O: 22JUL2014 07:11:06  36.7N  121.3W Md=2.9  ANSS   SSE of Ridgemark California  

P: 25JUL2014 81947     36.5N  121.0W 2.5-4.4 BAAAA  Central California         

P: 29JUL2014 81947     36.8N  121.3W 2.5-4.4 CAAAA  Central California         

 

O: 22JUL2014 09:34:13  37.6N  118.9W Md=2.0  ANSS   Mammoth Lakes California     

O: 22JUL2014 09:34:13  37.6N  118.9W ML=2.0  NCSN    Mammoth Lakes, CA

O: 22JUL2014 11:46:39  37.7N  118.9W ML=2.1  NCSN    Mammoth Lakes, CA

O: 22JUL2014 06:58:22  37.7N  118.9W ML=2.4  NCSN    Mammoth Lakes, CA

O: 22JUL2014 11:46:39  37.7N  118.9W Md=2.1  ANSS   Mammoth Lakes California     

O: 22JUL2014 06:58:22  37.7N  118.9W Md=2.4  ANSS   Mammoth Lakes California     

P: 23JUL2014 81943     37.5N  118.6W 2.5-4.8 AAAAA  California/Nevada area     

 

O: 23JUL2014 05:55:23  38.8N  122.4W md=2.1  ANSS   Hidden Valley Lake California

O: 23JUL2014 05:55:23  38.8N  122.5W ML=2.1  NCSN    Lower Lake, CA

O: 22JUL2014 17:09:06  38.8N  122.8W ML=2.0  NCSN    The Geysers, CA

O: 22JUL2014 16:32:32  38.9N  122.6W ML=2.2  NCSN    Clearlake, CA

O: 22JUL2014 17:09:06  38.8N  122.8W Md=2.0  ANSS   WNW of Cobb California       

P: 18JUL2014 81711     38.9N  122.8W 2.5-4.6 BAAAA  Central California         

 

NEIC reported this earthquake of M 2.2 in Northern California was felt with intensity II-III in the area(s) of Clearlake and Lower Lake, California.

 

O: 22JUL2014 16:32:32  38.9N  122.6W Md=2.2  ANSS   S of Clearlake California    

P: 23JUL2014 81950     38.5N  122.7W 2.5-4.6 AAAAA  Central California         

 

O: 23JUL2014 04:12:05  41.8N  119.7W Md=2.1  ANSS   SE of Lakeview Oregon        

O: 22JUL2014 12:25:27  41.9N  119.6W ML=2.3  NCSN    Wimer Place, NV

O: 22JUL2014 12:25:27  41.9N  119.6W ml=2.3  ANSS   ESE of Lakeview Oregon       

P: 18JUL2014 81777     42.2N  120.3W 2.0-4.1 BAAAA  Oregon state, U.S.         

 

 

ALASKA

 

O: 22JUL2014 20:15:11  51.7N  173.5W mb=4.1  ANSS   SE of Atka Alaska            

P: 25JUL2014 82053     51.8N  176.0W 3.5-4.9 BABAA  Andreanoff Isls, Aleutians 

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 22JUL2014 20:28:57  46.5N  117.9W Md=2.0  ANSS   NNE of Dayton Washington     

P: 27JUL2014 82025     47.7N  117.4W 2.0-3.9 BBAAA  Montana/Idaho               

 

O: 22JUL2014 20:01:29  46.9N  122.0W Ml=2.4  ANSS   ENE of Eatonville Washington 

P: 16JUL2014 81784     47.5N  121.8W 2.0-4.1 CAAAA  Washington state, U.S.     

 

ROCKY MOUNTAINS REGION

 

No earthquakes of M>=2 were located in the Rocky Mountain region today.

 

EASTERN U.S./CANADA

 

O: 22JUL2014 06:23:06  35.5N   97.2W mb=2.2  ANSS   E of Choctaw Oklahoma        

O: 23JUL2014 00:25:14  35.8N   97.4W ML=2.5  CESN   Cedar Valley, OK 

O: 22JUL2014 17:50:29  36.7N   98.2W ML=2.6  CESN   Helena, OK 

O: 22JUL2014 17:28:09  35.8N   97.4W ML=2.6  CESN   Cedar Valley, OK 

O: 22JUL2014 10:18:39  35.8N   97.4W ML=2.2  CESN   Cedar Valley, OK 

O: 22JUL2014 06:23:06  35.5N   97.2W ML=2.2  CESN   Midwest City, OK 

O: 22JUL2014 03:28:17  35.8N   97.4W ML=2.2  CESN   Cedar Valley, OK 

O: 22JUL2014 02:08:33  35.6N   97.4W ML=2.6  CESN   Lake Aluma, OK 

O: 22JUL2014 03:28:17  35.8N   97.4W mb=2.2  ANSS   S of Guthrie Oklahoma        

O: 22JUL2014 10:18:39  35.8N   97.4W mb=2.2  ANSS   S of Guthrie Oklahoma        

O: 23JUL2014 00:25:14  35.8N   97.4W mb=2.5  ANSS   SSW of Guthrie Oklahoma      

O: 22JUL2014 17:28:09  35.8N   97.4W ml=2.6  ANSS   S of Guthrie Oklahoma        

O: 23JUL2014 02:02:26  35.9N   97.3W mb=3.3  ANSS   SW of Langston Oklahoma      

P: 28JUL2014 81997     35.0N   97.0W 2.0-4.0 BAAAA  Southern Plains            

 

NEIC reported this earthquake of M 2.2 in Oklahoma was felt with intensity II-III in the area(s) of Guthrie, Oklahoma. The M 2.5 was felt in Guthrie with intensity IV and in Pawnee with intensity II. The M 3.3 was the most widely felt with itensity IV in Coyle and II-III in Newalla, Glencoe, Oklahoma City, Guthrie, and Edmond, Oklahoma and possibly in Derby, Kansas.

 

O: 22JUL2014 17:50:29  36.7N   98.2W ml=2.6  ANSS   NNE of Helena Oklahoma       

P: 13JUL2014 81744     37.0N   98.0W 2.0-3.9 CAAAA  Southern Plains            

 

O: 22JUL2014 07:10:34  36.6N   89.6W md=1.3  ANSS   SSW of Lilbourn Missouri     

O: 22JUL2014 07:10:34  36.6N   89.6W ML=1.3  CESN   New Madrid, MO 

P: 23JUL2014 81964     37.0N   88.0W 2.0-3.9 AAAAA  New Madrid area            

 

O: 22JUL2014 06:05:20  47.4N   70.6W ML=2.4  NRCA  CHARLEVOIX  SEISMIC ZONE, QC. 

O: 22JUL2014 06:05:21  47.2N   70.5W ML=2.5  WES    NE of Quebec City, Quebec    

P: 19JUL2014 81768     47.3N   70.5W 2.0-3.9 BAAAA  New England                

 

HAWAII

 

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