DOUBLE WHAMMY IN IRAN

 

EARTHQUAKE SUMMARY FOR DECEMBER 11, 2017

 

Two moderately large earthquakes hit the region of Iran today. These included and M 5.9 and aftershocks in eastern Iran and an M 5.5 on the Iran-Iraq border region and were accompanied by moderately large events in Tonga, Vanuatu and northern Chile. Active seismic conditions today probably reflect the influence of the geomagnetic storm of the past three days as noted in the previous summary:

 

“The Increased seismicity is expected near the geomagnetic equator over the next four days. A strong related earthquake is most likely around December 11-13.”

 

The largest of today’s events was the M 5.9 in Eastern Iran. NEIC reported it was felt with intensity IV in Kerman and II-III in Bam, Yazd, Tabas and possibly in Karaj, Teheran, Iran. This is a region which became active after the M 7.2 of November 12, 2017 along the Iran-Iraq border. The last earthquake within about 200 km of this epicenter with M>=5.9 occurred on December 1, 2017 with M 5.9-6.0, the first such event in the region since an M 6.4 on February 22, 2005. An M 6.6 also hit about 100 km southeast of today's epicenter on March 14, 1998. It is likely that this earthquake was promoted by high tidal stresses. It occurred within about 30 minutes of local solar noon, a time of maximized tidal stresses.  Forecast 112588 expected this epicenter to be active around December 11. This earthquake is located at the third node (120 degrees) from the earthquakes of M 6.7-7.0 in Iran which occurred last month and were probably promoted from that source.

 

O: 12DEC2017 09:42:20  30.8N   57.3E ML=4.2  EMSC   EASTERN IRAN

O: 12DEC2017 09:50:27  30.8N   57.3E ML=4.2  EMSC   EASTERN IRAN

O: 12DEC2017 08:43:18  30.7N   57.3E Mw=5.9  EMSC   EASTERN IRAN                  

P: 11DEC2017 112588    30.0N   57.0E 3.5-4.9 AAAAA  So. Iran/Persian Gulf      

 

A moderate aftershock of M 5.4 also hit the border region of Iran and Iraq today. This is the strongest aftershock in the region since the mainshock of M 7.3 on November 12, 2017. NEIC reported today's event was felt with maximum intensity VI in Irbil, Iraq at Halubjah. It was also felt with intensity II-III in Dezh Shahpur, Kordestan, Iran and III-V in Kusanjaq, Iraq and Naghada and Bane Kordestan, Iran. Lesser shaking in Iraq was felt in Kirkuk, Qal'at Dizah, Balad, Baghdad and Dahuk and in Iran at Orumiyeh, Mehran, Bidjar, Aslamabad, Sannandaj, Iran. An M 4.7 aftershock was reported with intensity IV-V within about 65 km of the epicenter at Pawa, Iran and II-III in Kirkuk, Iraq and Aslamabad, Iran. This may have been triggered by a strong geomagnetic storm which reached high latitude Kp of 6 from 1200-1900 UT. It was during this period when moderately strong earthquakes near the geomagnetic equator occurred in Tarapaca Chile (M 5.5) and in Vanuatu (M 5.7). Forecast 112877 expected this aftershock was likely around December 12, 2017 with magnitude up to M 5.4.

 

O: 11DEC2017 14:09:56  34.9N   45.8E Mw=5.4  EMSC   IRAN-IRAQ BORDER REGION      

O: 11DEC2017 14:42:46  35.0N   45.8E mb=4.9  EMSC   IRAN-IRAQ BORDER REGION      

P: 12DEC2017 112877    36.0N   46.0E 3.8-5.4 AAAAA  No. Iran                   

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 in Northern Alaska northwest of Unalakleet, Alaska. It was not reported felt in this area. This is the strongest earthquake within  about 150 km of this epicenter in northwestern Alaska in more than 7 years – since an M 3.7 on November 9, 2010. The last earthquake in the are of M>3.7 occurred on July 6, 2006 with M 4.8. Forecast 112972 expected this area could be active in mid-December. 

 

O: 12DEC2017 01:02:09  64.4N  162.5W ML=3.7  EMSC   NORTHERN ALASKA              

O: 12DEC2017 01:02:09  64.4N  162.5W ml=3.7  ANSS   NW of Unalakleet Alaska      

P: 21DEC2017 112972    61.3N  158.5W 3.2-5.1 CCCAA  Central Alaska             

 

A moderately large earthquake of M 5.5 also occurred off the coast of northern Tarapaca, Chile today. CSN reported this earthquake was felt with intensity III in  Huara, Pisagua, Pozo Almonte; II Alto Hospicio, Iquique, Felt in Tarapaca, Chile. NEIC reported this earthquake of M 5.5 in Chile was felt with intensity VI in Iquique, Tarapaca and II-III in the area(s) of Arica, Tarapaca, Chile.  This is the strongest earthquake in this region within about 100 km since an M 5.7 on August 14, 2014. Like other activity today this event occurred near the geomagnetic equator and was associated with a strong geomagnetic storm which maximized at this time.  Forecast 112755 expected this event in this area was likely in early December. This event is at the third node (120 degrees) from the Iran events of earlier in the day. It is also at 107 degrees from the Loyalty Islands and may have been promoted from that source.

 

O: 11DEC2017 19:00:56  19.7S   71.1W Mw=5.5  EMSC   OFF COAST OF TARAPACA, CHILE 

O: 11DEC2017 19:40:24  19.7S   71.2W mb=4.0  EMSC   OFF COAST OF TARAPACA, CHILE 

O: 11DEC2017 19:00     19.7S   71.2W mb=5.4  GUC    Huara, Pisagua, Pozo Almonte;

P:  6DEC2017 112755    20.0S   70.0W 4.0-5.4 BAAAA  So. Peru/Bolivia           

 

Another moderately strong earthquake today occurred in northern Vanuatu with M 5.7. This earthquake was not reported felt in the area. It follows an M 4.8 foreshock which occurred on December 9, 2017 to the south of this event. The last earthquake within about 150 km of this epicenter with M>=5.7 was an M 6.8 on May 9, 2017.  Forecast 112995 had expected this event was likely in mid- December.

 

O: 11DEC2017 17:29:12  14.3S  167.4E Mw=5.7  EMSC   VANUATU                       

P: 18DEC2017 112995    15.0S  167.0E 4.0-5.5 CAAAA  Vanuatu Islands            

 

An M 5.6 in Tonga also occurred today.  Like many of the larger events in the region in the past week, this appears to have been promoted by high tidal stresses. It occurred within about an hour of local solar midnight when tidal stresses are maximized. The last earthquake within about 200 km of this epicenter in Tonga was an M 6.0 about 50 km to the south on October 18, 2017 and prior to that an M 5.7 on July 17, 2017. Forecast 112757 had expected this epicenter would be active in early December within about 10 km of this event. This earthquake is at 143 degrees from the M 7.2 in Iran of November 12 (M 7.2), the last major quake in the world. This is a distance at which seismic energy from large events concentrates at the surface and can help promoted further seismicity.

 

O: 11DEC2017 10:50:02  21.0S  173.9W mb=5.6  EMSC   TONGA                        

P:  4DEC2017 112757    21.0S  174.0W 4.0-5.5 BAAAA  Tonga Islands              

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: 11DEC2017 14:09:56  34.9N   45.8E Mw=5.4  EMSC   IRAN-IRAQ BORDER REGION      

O: 11DEC2017 14:42:46  35.0N   45.8E mb=4.9  EMSC   IRAN-IRAQ BORDER REGION      

P: 12DEC2017 112877    36.0N   46.0E 3.8-5.4 AAAAA  No. Iran                   

 

O: 12DEC2017 02:05:28  37.8N   69.8E mb=4.5  EMSC   TAJIKISTAN                   

P: 13DEC2017 112866    37.0N   70.0E 3.8-5.5 AAAAA  Hindu Kush/Pakistan        

 

O: 11DEC2017 11:44:49  53.3N  107.7E Ms=4.1  EMSC   LAKE BAYKAL REGION, RUSSIA   

P:  4DEC2017 112709    56.0N  110.0E 3.0-4.8 CCBAA  So. Siberia                

 

O: 12DEC2017 09:42:20  30.8N   57.3E ML=4.2  EMSC   EASTERN IRAN

O: 12DEC2017 09:50:27  30.8N   57.3E ML=4.2  EMSC   EASTERN IRAN

O: 12DEC2017 08:43:18  30.7N   57.3E Mw=5.9  EMSC   EASTERN IRAN                 

P: 11DEC2017 112588    30.0N   57.0E 3.5-4.9 AAAAA  So. Iran/Persian Gulf      

 

INDONESIA AND PHILIPPINES

 

O: 11DEC2017 14:11:19   1.7N  127.4E mb=4.6  EMSC   HALMAHERA, INDONESIA         

O: 11DEC2017 11:51:19   2.2N  128.3E ML=4.7  EMSC   HALMAHERA, INDONESIA         

P: 12DEC2017 112789     2.0N  127.0E 4.0-5.4 AAAAA  Halmahera                  

 

O: 12DEC2017 02:23:11   7.3S  107.0E mb=4.5  EMSC   JAVA, INDONESIA              

P:  4DEC2017 112540     9.0S  107.0E 4.0-5.6 CBAAA  So. of Java                 

 

O: 11DEC2017 16:49:50  11.8N   93.8E mb=4.6  EMSC   ANDAMAN ISLANDS, INDIA REGION

P: 17DEC2017 112812    12.0N   93.0E 4.0-5.6 CAAAA  Andaman Islands            

 

O: 11DEC2017 23:41:54  18.4N  145.5E mb=4.5  EMSC   PAGAN REG., N. MARIANA ISLANDS

P: 11DEC2017 112568    18.0N  145.0E 4.0-5.6 AAAAA  No. Marianas               

 

CENTRAL AND SOUTH AMERICA

 

O: 11DEC2017 19:59:22   4.0N   74.1W Mw=4.1  EMSC   COLOMBIA                     

P:  7DEC2017 112514     5.0N   76.0W 4.0-5.5 BABAA  Colombia                    

 

O: 12DEC2017 01:49:30   9.1N   85.0W ML=4.0  EMSC   COSTA RICA                   

P: 12DEC2017 112787     9.0N   84.0W 3.5-5.1 AAAAA  Costa Rica                 

 

O: 11DEC2017 11:11:59  15.3N   94.4W ML=4.0  EMSC   OFFSHORE CHIAPAS, MEXICO     

O: 11DEC2017 10:23:16  15.9N   94.3W ML=4.1  UNAM  l SUROESTE de ARRIAGA , CHIS *: 15

O: 11DEC2017 11:11:59  15.3N   94.4W ML=4.0  UNAM  al SUROESTE de TONALA, CHIS *: 15.

P: 16DEC2017 112815    15.0N   94.0W 3.5-5.1 BAAAA  Chiapas, Mexico             

 

O: 11DEC2017 04:46:31  14.8N   92.6W ML=4.3  UNAM  l SUROESTE de TAPACHULA, CHIS *: 1

O: 11DEC2017 22:57:49  15.5N   93.6W ML=4.2  UNAM  l SUROESTE de PIJIJIAPAN, CHIS *:

O: 11DEC2017 07:50:09  15.3N   93.7W ML=4.0  UNAM  l SUROESTE de PIJIJIAPAN, CHIS *:

O: 11DEC2017 22:57:49  15.5N   93.6W ML=4.2  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 13DEC2017 112815    15.0N   93.0W 3.5-5.2 AAAAA  Chiapas, Mexico            

 

O: 11DEC2017 13:19:03  15.5N   95.0W ML=4.1  UNAM  l SURESTE de SALINA CRUZ, OAX *: 1

O: 11DEC2017 20:58:48  16.4N   95.1W ML=4.0  UNAM   OESTE de JUCHITAN DE ZARAGOZA, OA

O: 12DEC2017 03:36:17  16.0N   95.1W ML=4.3  UNAM  l SURESTE de SALINA CRUZ, OAX *: 1

O: 11DEC2017 11:59:45  16.0N   95.2W ML=4.0  UNAM  l SUR de SALINA CRUZ, OAX *: 16.04

O: 11DEC2017 13:19:03  15.6N   95.0W ML=4.1  EMSC   OFFSHORE OAXACA, MEXICO      

O: 12DEC2017 03:36:17  16.0N   95.1W ML=4.3  EMSC   OFFSHORE OAXACA, MEXICO      

O: 11DEC2017 11:59:45  16.0N   95.2W ML=4.0  EMSC   OFFSHORE OAXACA, MEXICO       

O: 11DEC2017 20:58:48  16.4N   95.1W ML=4.0  EMSC   OAXACA, MEXICO               

P: 10DEC2017 112553    17.0N   95.0W 3.5-5.4 AAAAA  Chiapas, Mexico            

 

O: 11DEC2017 19:00:56  19.7S   71.1W Mw=5.5  EMSC   OFF COAST OF TARAPACA, CHILE 

O: 11DEC2017 19:40:24  19.7S   71.2W mb=4.0  EMSC   OFF COAST OF TARAPACA, CHILE 

P:  6DEC2017 112755    20.0S   70.0W 4.0-5.4 BAAAA  So. Peru/Bolivia           

 

O: 11DEC2017 21:20:37  24.0S   67.0W mb=4.2  EMSC   SALTA, ARGENTINA             

P: 13DEC2017 112996    24.0S   68.0W 4.0-5.4 AAAAA  Argentina                  

 

O: 12DEC2017 08:53:22  15.3N   94.2W mb=4.9  EMSC   OFFSHORE CHIAPAS, MEXICO     

P: 11DEC2017 112552    14.0N   94.0W 3.5-5.3 ABAAA  Chiapas, Mexico            

P: 16DEC2017 112815    15.0N   94.0W 3.5-5.1 BAAAA  Chiapas, Mexico            

 

O: 12DEC2017 08:00:29  27.7N  103.3W ML=4.2  EMSC   COAHUILA, MEXICO             

 

 

AFRICA AND EUROPE

 

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

 

SOUTHWEST PACIFIC

 

O: 11DEC2017 17:29:12  14.3S  167.4E Mw=5.7  EMSC   VANUATU                      

P: 18DEC2017 112995    15.0S  167.0E 4.0-5.5 CAAAA  Vanuatu Islands            

 

O: 11DEC2017 10:50:02  21.0S  173.9W mb=5.6  EMSC   TONGA                        

P:  4DEC2017 112757    21.0S  174.0W 4.0-5.5 BAAAA  Tonga Islands              

 

OCEAN RIDGES

 

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

 

 

ZEALANDIA AND AUSTRALIA REGION

 

O: 11DEC2017 19:16:31  30.2S  177.9W mb=4.9  EMSC   KERMADEC ISLANDS, NEW ZEALAND

P: 18DEC2017 113013    30.0S  177.0W 4.0-5.8 CAAAA  No. 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: 11DEC2017 15:05:42  33.8N  116.9W ML=2.1  EMSC   SOUTHERN CALIFORNIA          

P:  9DEC2017 112633    34.3N  116.5W 2.5-4.6 AAAAA  So. California             

 

O: 11DEC2017 16:07:56  34.4N  117.2W ML=2.3  EMSC   SOUTHERN CALIFORNIA          

P:  8DEC2017 112632    34.1N  117.4W 2.5-4.4 BAAAA  So. California             

 

O: 11DEC2017 20:02:34  38.8N  122.8W MD=2.0  EMSC   NORTHERN CALIFORNIA          

P: 12DEC2017 112860    38.7N  122.7W 2.5-4.4 AAAAA  Central California         

 

O: 11DEC2017 21:01:01  39.5N  119.6W ML=2.2  EMSC   NEVADA                       

P:  9DEC2017 112676    40.0N  120.9W 2.5-4.4 AAAAA  Northern California        

 

O: 11DEC2017 20:31:56  39.6N  123.4W MD=2.1  EMSC   NORTHERN CALIFORNIA          

P: 13DEC2017 112861    39.7N  123.7W 2.5-4.6 AAAAA  Central California         

 

O: 11DEC2017 07:04:12  31.7N  115.0W ML=3.0  UNAM  l SUR de GPE VICTORIA(KM.43), B

O: 11DEC2017 12:42:46  31.0N  115.6W ML=2.8  UNAM  l NORESTE de VICENTE GUERRERO,

P:  9DEC2017 112625    30.2N  114.1W 2.0-3.9 AABAA  SW U.S.A                   

P: 18DEC2017 112887    31.9N  116.3W 2.5-4.4 CAAAA  So. California             

 

O: 12DEC2017 09:06:06  33.5N  116.8W ML=2.0  EMSC   SOUTHERN CALIFORNIA          

P: 21DEC2017 112889    33.4N  116.7W 2.5-4.4 CAAAA  So. California             

 

ALASKA

 

O: 12DEC2017 01:02:09  64.4N  162.5W ML=3.7  EMSC   NORTHERN ALASKA              

O: 12DEC2017 01:02:09  64.4N  162.5W ml=3.7  ANSS   NW of Unalakleet Alaska      

P: 21DEC2017 112972    61.3N  158.5W 3.2-5.1 CCCAA  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

 

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

 

EASTERN U.S./CANADA

 

O: 12DEC2017 00:11:28  36.5N   99.1W mb=2.6  EMSC   OKLAHOMA                     

P: 16DEC2017 112902    38.0N   99.0W 2.0-4.3 BBAAA  Southern Plains            

 

O:  8DEC2017 11:47:48  47.4N   70.2W ML=1.4  NRCA  CHARLEVOIX SEISMIC ZONE       

P:  5DEC2017 112669    47.3N   70.5W 2.0-4.1 BAAAA  New England                

P: 10DEC2017 112662    47.0N   69.0W 2.0-4.1 AAAAA  Maine                      

 

HAWAII

 

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