STRONG QUAKE IN NORTHERN MID-ATALNTIC RIDGE

 

EARTHQUAKE SUMMARY FOR FEBRUARY 14, 2019

 

A strong earthquake of M 6.2, followed by an M 5.0 aftershock occurred in the Northern Mid-Atlantic Ridge today. These events were not felt in this remote area and no tsunami was generated or expected. This is located at an unusual epicenter south of the Azores. The last earthquake within about 250 km of this epicenter in the Northern  Mid-Atlantic Ridge occurred as an M 6.3 on May 24, 2010. Other events in the region in the past 30 years with equal or greater magnitude occurred in August, 1990 (M 6.3); April, 1995 (M 6.2); April, 2003 (M 6.1).  Forecast 113516 had expected a possibly moderately large event in this region of the Atlantic was possible around February 13.

 

O: 14FEB2019 20:43:31  35.3N   36.1W mb=5.0  EMSC   NORTHERN MID-ATLANTIC RIDGE  

O: 14FEB2019 20:43:32  35.4N   35.9W mb=5.0  ANSS   Northern Mid-Atlantic Ridge"

O: 14FEB2019 19:57:05  35.4N   36.1W mw=6.2  ANSS   Northern Mid-Atlantic Ridge"

O: 14FEB2019 19:57:06  35.4N   36.3W Mw=6.1  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P: 13FEB2019 113516    38.0N   32.0W 4.0-5.7 ACCAA  No. Mid-Atlantic Ridge     

 

An earthquake of M 5,4 on the geomagnetic equator today was strongly felt in central Peru. NEIC reported maximum intensity VII in Pampas, Huancavelica, Peru with V in Huancavelica, and Ayacucho; IV in San Luis, Lima, Huancayo and Huanta and II-III in Satipo, Junin, Santa Ana, Cusco, and Huanuco, Peru.  Recent such earthquakes have occurred about 150 km north or south of this epicenter. The last within about 150 km of today's epicenter occurred nearly 18 years ago on February 21, 2001 with M 5.6-5.7. Forecast 113629 expected a possible moderately large event in this area was possibly around February 13.

 

O: 14FEB2019 14:33:16  12.1S   74.2W Mw=5.4  EMSC   CENTRAL PERU                 

P: 13FEB2019 113629    11.0S   74.0W 4.0-5.6 ABAAA  Central Peru               

 

The strongest earthquakes in the U.S. or Canada today continued in the swarm which began yesterday with the geomagnetic storm in the Vancouver Island area of Canada. Earthquakes today included the M 5.1 mainshock as well as events of M 4.4, 4.3, 3.7, and 3.5. This summary had noted this series in the previous issue as:

 

"The earthquake swarm in the Vancouver Island, region of Canada began at 0715 with an N 3,2 as the geomagnetic storm was reaching towards maximum and included an M 3.4, 3.5, 4.1 and 4.8-5.1. These events were lightly felt in the epicentral area according to Earthquakes Canada. Earthquakes Canada reported the largest of these at M 5.1. The last earthquake within about 100 km of these epicenters off Vancouver with M>=5.1 in the NEIC database was an M 5.3 more than two years ago on January 7, 2017. Forecast 113591 had expected today's event within about 10 km of the epicenter was likely around February 13." (February 13-14, 2019)

 

 

O: 14FEB2019 04:43:51  50.6N  130.2W ML=3.7  NRCA  195 km W   of Pt. Hardy

O: 14FEB2019 00:54:39  50.5N  130.4W ML=4.3  NRCA  212 km W   of Pt. Hardy

O: 14FEB2019 00:34:40  50.5N  130.3W ML=5.1  NRCA  203 km W   of Pt. Hardy

O: 13FEB2019 22:53:55  50.5N  130.3W ML=4.4  NRCA  207 km W   of Pt. Hardy

O: 14FEB2019 12:29:20  50.5N  130.4W ML=3.5  NRCA  209 km W   of Pt. Hardy       

P: 13FEB2019 113591    50.6N  130.5W 3.0-5.0 AAAAA  British Colombia           

 

The swarm in the Kuril Islands also continued today and was joined by earthquake of moderate magnitude in the Komandorsky Islands and Kamchatka. The events in the Kurils were reported with M 4.9 and 4.6 and forecast within about 100 km in forecast 113579 to occur around February 12.

 

O: 14FEB2019 07:18:50  45.7N  150.3E mb=4.9  EMSC   KURIL ISLANDS                

O: 14FEB2019 18:53:15  45.7N  151.1E mb=4.6  EMSC   KURIL ISLANDS                

P: 12FEB2019 113579    45.0N  152.0E 3.5-5.9 AAAAA  So. Kurils                 

 

The activity in the northwest Pacific in Kamchatka, the Komandorsky Islands and the Kurils was associated with an M 4.9 in the South Georgia Island region of the South Atlantic. This is near the antipode of the Kurils and occurred within an hour of local solar midnight. It was probably enhanced by antipodal and tidal effects. A similar M 4.9 hit this area within about 200 km of this epicenter on January 30 but the last of larger magnitude in this area was an M 5.4 on December 12, 2018 and an M 5.0 on April 4, 2018. Forecast 113403 expected a moderate quake in this region around February 7.

 

O: 15FEB2019 02:56:16  55.2S   31.7W mb=4.9  EMSC   SOUTH GEORGIA ISLAND REGION  

P:  7FEB2019 113403    56.0S   29.0W 4.0-5.8 CABAA  So. Sandwich Islands       

 

The earthquake swarm in the Gulf of California noted in the previous issue of this summary migrated to the south today. There were four moderate quakes in this newly located swarm including events of M 4.0, 4.0 and 4.2. Forecast 113474  

expected this series was likely around February 17. In the previous issue this summary had noted this series as:

 

 

"While not at high latitudes a swarm of light to moderate earthquakes also  occurred in the Gulf of California at the start of the geomagnetic storm and was probably promoted by it. These events of M 3.7, 3.8, 3.9 and 4.1 were the first of this size to be intimately associated with the geomagnetic storm. They occurred within minutes of local solar midnight, a prime time for geomagnetic effects. The last events within about 100 km of this epicenter with M>=4.1 occurred nearly two years ago on May 23, 2017 (M 4.3) and prior to that as an M 4.1 on January 18, 2017. Forecast 113474 had expected this activity within about 25 km was likely around February 17. This area is antipodal to Tropical Cyclone Gelena currently east of Madagascar. This summary had expected some seismic enhancement in the Gulf of California at this time due to focusing of seismic energy at the antipode of TC Gelena" (February 13-14, 2019)

 

O: 14FEB2019 10:52:33  27.4N  111.5W ML=3.6  EMSC   GULF OF CALIFORNIA           

O: 14FEB2019 11:07:22  27.7N  111.8W ML=4.2  EMSC   GULF OF CALIFORNIA           

O: 14FEB2019 10:46:42  27.8N  111.8W ML=4.0  EMSC   GULF OF CALIFORNIA           

O: 14FEB2019 10:49:49  27.8N  111.9W ML=4.0  EMSC   GULF OF CALIFORNIA           

P: 17FEB2019 113474    28.0N  112.0W 3.5-4.9 AAAAA  Gulf of California         

 

GEOMAGNETIC STORM MAY HAVE TRIGGERED SERIES  NEAR VANCOUVER AND KURILS

 

EARTHQUAKE SUMMARY FOR FEBRUARY 13, 2019

 

A new geomagnetic storm occurred today beginning about 0700 UT and was accompanied by a series of moderate earthquake in the high latitudes of the Kuril Islands (M 5.0, 5.0, 5.1, 4.5) and in the region of Vancouver Island, British Columbia, Canada (M 3.6, 3.4, 3.2, 4.1, 5.1). Other locations at high latitudes showing moderate seismicity during this short-lived storm included the South Sandwich Islands (M 4.9, 4.9); Kamchatka (M 5.2) and the Rat Islands, Aleutians (M 4.8). A swarm in the northern Gulf of California also coincided with the start of this geomagnetic storm with magnitudes up to M 4.1. All of these were probably promoted by effects from the geomagnetic storm. The geomagnetic storm is described in this summary as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 13. High latitude geomagnetic field saw active conditions  with AP at 28. This may be the beginning of a new geomagnetic storm but more likely it is a short excursion which peaked around 1200-1500 UT on February 13. Seismicity along the geomagnetic equator may be slightly enhanced but is more likely to be promoted at high latitudes. The storm began about 0700 UT and was immediately followed by a series of light to moderate earthquake in the Vancouver Island area of B.C. Canada which was near local solar midnight at the time of maximum KP. KP at high  latitudes reached 6 between 0700 and 1400 UT. The only other time high latitude KP has reached level 6 in the past month was during the storm of February 1" (February 13-14, 2019)

 

The swarm in the Kuril Islands northeast of Hokkaido, Japan was unusual and began as the geomagnetic storm was reaching maximum Kp. It included events of M 5.1, 5.0, 5.0 and 4.5. These were not reported felt in the epicentral area.

The Kuril Islands have been relatively quiet in recent months. The last event within about 300 km of today's epicenter with greater magnitude than M 5.1 was an M 5.8 nearly a year ago on March 7, 2018. The last of M 5.1 occurred on December 28, 2018. Forecast 113579 had expected today's activity within about 50 km of these epicenters was likely around February 12.

 

O: 13FEB2019 10:02:55  45.3N  151.4E Mw=5.0  EMSC   KURIL ISLANDS                

O: 13FEB2019 09:25:27  45.3N  151.5E mb=5.0  EMSC   KURIL ISLANDS                

O: 13FEB2019 11:43:58  45.4N  151.4E mb=5.1  EMSC   KURIL ISLANDS                

O: 14FEB2019 04:52:08  45.6N  151.5E mb=4.5  EMSC   KURIL ISLANDS                

P: 12FEB2019 113579    45.0N  152.0E 3.5-5.9 AAAAA  So. Kurils                 

 

The earthquake swarm in the Vancouver Island, region of Canada began at 0715 with an N 3,2 as the geomagnetic storm was reaching towards maximum and included an M 3.4, 3.5, 4.1 and 4.8-5.1. These events were lightly felt in the epicentral area according to Earthquakes Canada. Earthquakes Canada reported the largest of these at M 5.1. The last earthquake within about 100 km of these epicenters off Vancouver with M>=5.1 in the NEIC database was an M 5.3 more than two years ago on January 7, 2017. Forecast 113591 had expected today's event within about 10 km of the epicenter was likely around February 13.

 

O: 13FEB2019 22:53:58  50.7N  130.1W mb=4.1  EMSC   VANCOUVER ISLAND, CANADA REGIO

O: 14FEB2019 00:34:40  50.5N  130.3W ML=5.1  NRCA  W   of Pt. Hardy

O: 13FEB2019 07:51:10  50.5N  130.4W ML=3.6  NRCA  W  of Pt. Hardy

O: 13FEB2019 07:50:01  50.5N  130.5W ML=3.4  NRCA  W   of Pt. Hardy

O: 13FEB2019 07:15:23  50.6N  130.3W ML=3.2  NRCA  W   of Pt. Hardy

O: 14FEB2019 00:34:44  50.7N  130.1W mb=4.8  EMSC   VANCOUVER ISLAND, CANADA REGIO

P: 13FEB2019 113591    50.6N  130.5W 3.0-5.0 AAAAA  British Colombia           

 

O: 13FEB2019 06:34:28  54.8N  160.6E mb=5.2  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 14FEB2019 113593    56.0N  162.0E 4.0-5.6 ABAAA  E. of Kamchatka            

 

O: 13FEB2019 07:09:11  51.7N  179.6E mb=4.8  EMSC   RAT ISLANDS, ALEUTIAN ISLANDS

P: 15FEB2019 113603    52.0N  177.0E 4.0-5.8 AABAA  Rat Islands                

 

O: 13FEB2019 13:21:02  55.4S   27.2W mb=4.9  EMSC   SOUTH SANDWICH ISLANDS REGION

P:  7FEB2019 113403    56.0S   29.0W 4.0-5.8 CAAAA  So. Sandwich Islands       

 

O: 13FEB2019 05:56:00  57.6S   25.0W mb=4.9  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 14FEB2019 113675    57.0S   25.0W 4.0-5.9 AAAAA  So. Sandwich Islands       

 

While not at high latitudes a swarm of light to moderate earthquakes also  occurred in the Gulf of California at the start of the geomagnetic storm and was probably promoted by it. These events of M 3.7, 3.8, 3.9 and 4.1 were the first of this size to be intimately associated with the geomagnetic storm. They occurred within minutes of local solar midnight, a prime time for geomagnetic effects. The last events within about 100 km of this epicenter with M>=4.1 occurred nearly two years ago on May 23, 2017 (M 4.3) and prior to that as an M 4.1 on January 18, 2017. Forecast 113474 had expected this activity within about 25 km was likely around February 17. This area is antipodal to Tropical Cyclone Gelena currently east of Madagascar. This summary had expected some seismic enhancement in the Gulf of California at this time due to focusing of seismic energy at the antipode of TC Gelena as:

 

 

 

"TC Gelena (13S) continued today east of Madagascar with winds up to 065 kts. It is expected to track to the southeast over the next week. The antipodal region at 26N 107W is antipodal to the Western Mexico and the Gulf of California.  Antipodal triggering may occur in the region of the Gulf of California and Baja, California." (February 11-13, 2019)

 

O: 13FEB2019 07:01:43  28.0N  112.3W ML=3.8  EMSC   GULF OF CALIFORNIA           

O: 13FEB2019 06:57:05  28.1N  112.3W ML=3.7  EMSC   GULF OF CALIFORNIA            

O: 13FEB2019 06:54:06  28.1N  112.3W ML=3.9  EMSC   GULF OF CALIFORNIA           

O: 13FEB2019 06:52:07  28.1N  112.4W ML=4.1  EMSC   GULF OF CALIFORNIA           

P: 17FEB2019 113474    28.0N  112.0W 3.5-4.9 AAAAA  Gulf of California         

 

MODERATELY LARGE QUAKE SHAKES NORTHERN MARIANA ISLANDS

 

EARTHQUAKE SUMMARY FOR FEBRUARY 12, 2019

 

The strongest earthquake in the world today was n M 5.9 in the Northern Mariana Islands. NEIC reported it was felt with intensity II-III in Tinian, Marianas and Tamuning, Guam. No damage or tsunami was expected nor reported. This is the strongest earthquake in the Northern Mariana Islands within about 100 km of this epicenter since an M 7.7 about 75 km south of today's epicenter on July 29, 2016. Forecast 113462 had expected today's event in the Northern Marianas was likely Around February 15.

 

O: 12FEB2019 12:34:15  19.0N  145.9E Mw=5.9  EMSC   MAUG ISLANDS REG, N. MARIANA I

P: 15FEB2019 113462    18.0N  145.0E 4.0-5.4 BAAAA  No. Marianas               

 

The second largest earthquake today was an M 5.1-5.2 in central Vanuatu.  This may have been promoted by Tropical Cyclone Oma which was over the epicenter when the earthquake occurred. This triggering had been expected in previous issues of this report as:

 

 

"TC 15P formed today in the region of northern Vanuatu with winds up to 45 kts. It is expected to track to the southeast over the next several days. Seismic enhancement in the region of Vanuatu could accompany the passage of this storm through the area." (February 11-12. 2019)

 

The last earthquake of M>=5.1 within about 100 km of this epicenter occurred with M 5.1 on November 19, 2018. The last of larger magnitude was an M 5.3 on September 17, 2018. Forecast 113644 had expected this event within about 15 km of the epicenter was likely around February 14.

 

O: 12FEB2019 10:53:06  15.1S  168.1E Mw=5.1  EMSC   VANUATU                      

P: 14FEB2019 113644    15.0S  168.0E 4.0-5.6 AAAAA  Vanuatu Islands            

 

An earthquake of M 4.7 in the Tonga Islands today followed passage of Tropical Cyclone Neil through the epicentral area over the past several days. Forecast 113658 had expected this event within about 100 km was likely around February 13.

 

O: 13FEB2019 04:05:32  23.8S  174.5W mb=4.7  EMSC   TONGA REGION                 

P: 13FEB2019 113658    23.0S  175.0W 4.0-5.6 AAAAA  Tonga Islands              

 

The elevated seismicity along the North Anatolian Fault zone in Turkey to Greece continued today with an M 4.8 and aftershocks of M 4.2 in Central Turkey east of Istanbul. A strong earthquake in the Istanbul area is expected in the near term by many geophysicists and is apparently overdue. The recent activity along the North Anatolian Fault including today's event may be preparatory seismicity to such and event. The last event of M>=4.8 within about 150 km of this epicenter in Central Turkey occurred  more than three years ago on January 10, 2016 (M 4.9) and prior to that an M 5.0 on November 24, 2013. A major M 7.3 event occurred in this area on November 12, 1999 following the great quake in Izmit, Turkey in August, 1999. Forecast 113565 had expected this event was likely within about 50 km of the epicenter around February 13.

 

NEIC reported this earthquake of M 4.8 in northern Turkey was felt with intensity IV in Kizilcahamam, Ankara, and II-III in Incesu, Kayseri, Turkey.

 

O: 12FEB2019 17:23:24  40.6N   33.0E mb=4.2  EMSC   CENTRAL TURKEY               

O: 12FEB2019 17:14:31  40.6N   33.0E mb=4.7  EMSC   CENTRAL TURKEY               

O: 12FEB2019 17:14:30  40.6N   32.9E mb=4.8  ANSS   CENTRAL TURKEY               

P: 13FEB2019 113565    41.0N   33.0E 3.5-5.2 AAAAA  No. Turkey/Black Sea       

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 in the central

Andreanof Islands, Aleutians, Alaska. This event was not reported felt in this remote area. The last event with M>=4.1 within about 100 km of this epicenter occurred November 21, 2018 with M 4.7. Forecast 113588 had expected a moderate event in this region was likely around February 12.

 

O: 12FEB2019 15:59:39  52.0N  174.4W mb=4.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 12FEB2019 113588    51.7N  175.3W 3.5-5.1 AAAAA  Andreanoff Isls, Aleutians 

 

An event of M 3.4 occurred today west of Parkfield in Central California. NEIC reported this earthquake of M 3.4 in Central California was felt with intensity II-III in the area(s) of San Juan Bautista and Turlock, California. The last event of M>=3.4 within about 50 km of this epicenter was an M 3.5 on January 23, 2018 with M 3.4. The last of significantly larger magnitude was an M 3.9 on May 19, 2015. Forecast 113220 had expected today's event within about 10 km of the epicenter was likely around February 11.

 

O: 12FEB2019 17:27:23  36.3N  120.8W ML=3.4  EMSC   CENTRAL CALIFORNIA            

P: 11FEB2019 113220    36.2N  120.8W 2.5-4.5 AAAAA  Central California         

 

ANOTHER QUIET DAY INCLUDES UNUSUAL M 4.8 IN BAY OF BENGAL

 

EARTHQUAKE SUMMARY FOR FEBRUARY 11, 2019

 

Global seismicity remained at very quiet levels today. No earthquakes of M>5 were recorded. a rarity in global seismicity. An unusual quake in the Bay of Bengal, India was the largest recorded within about 250 km of that epicenter in at least 30 years.

 

An unusual event of M 4.9 occurred in the Bay of Bengal east of India today. NEIC reported this earthquake of M 4.9 in the Bay of Bengal was felt with intensity IV in Chetpet, Tamil Nadu, India and II-III in the area(s) of Tamil Nadu, India at Tinuverkadu, Saint Thomas, Ambattur, Manapakkam, Alandur, Madras and Anakaputhur, India.  This is the strongest earthquake recorded within about 300 km of this epicenter in at least 30 years. The only other event recorded in this area since 1990 with M>=4.0 was an M 4.8 on December 9, 1995.  Forecast 113168 had expected moderate activity southeast of this in early February.

 

O: 12FEB2019 01:32:36  14.3N   86.0E mb=4.9  EMSC   BAY OF BENGAL                

P:  6FEB2019 113168    12.0N   92.0E 4.0-5.4 CCCAA  Andaman Islands            

 

 

The strongest earthquake of the day was an M 5.0 in the region of Samoa. This

occurred following the passage of Tropical Cyclone Neil through the region as noted in previous issues:

 

 

"TC Neil formed today in the region of Tonga with winds up to 45 kts. It is expected to track to the southeast over the next several days. Seismic enhancement in the region of Tonga and Fiji could accompany the passage of this ttorm through the area." (February 10-11, 2019)

 

Forecast 113641 had expected this event was likely in mid-February.

 

O: 11FEB2019 23:26:59  15.8S  172.3W mb=5.0  EMSC   SAMOA ISLANDS REGION         

P: 15FEB2019 113641    16.0S  174.0W 4.0-5.9 BABAA  Tonga Islands              

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 off the coast of Oregon. This event had been expected in this summary to occur at this time in forecast 113570 within about 50 km of this epicenter. It appears to be part of the recent activation of seismicity off the northwest U.S. Earthquakes of larger or equal magnitude last occurred within about 100 km of this epicenter on January 27, 2019 (M 4.5) and July 29, 2018 (M 5.3, 4.4). 

 

O: 12FEB2019 03:52:32  44.6N  129.3W mb=4.1  EMSC   OFF COAST OF OREGON          

P: 13FEB2019 113570    44.1N  128.8W 3.0-4.4 AAAAA  Off Coast of Oregon        

 

QUIET GLOBAL SEISMICITY CONTINUES

 

EARTHQUAKE SUMMARY FOR FEBRUARY 10, 2019

 

Global seismicity continued today at quiet levels. As with the past two days, the largest earthquake in the world today were M 5.0-5.3 and occurred in Southern Iran (M 5.3); Nicaragua/Honduras (M 5.3); Tonga (M 5.1) and Mindanao, Philippines (M 5.2). None of these earthquakes caused reported damage or casualties and most of this activity occurred in area which have been active over the past week.

 

The last earthquake in southern Iran of M>=5.3 within about 200 km of today's epicenter was an M 5.4 on July 22, 2018. The last of significantly larger magnitude was an M 6.1 on May 11, 2013. Forecast 113209 had expected today's event in Southern Iran was likely within about 150 km of the epicenter in early February. NEIC reported this earthquake of M 5.3 in Southern Iran was felt with intensity V in Bandar Abbas, Iran and II-III in the area(s) of Gheshm, Iran; Hasab, Oman; and in the United Arab Emirates at Abu Dhabi (IV) and II-III in Ras Al Khaiman, Ulman, Ash-Shanqaj. 

 

O: 11FEB2019 04:12:35  27.0N   55.7E mb=4.5  EMSC   SOUTHERN IRAN                

O: 10FEB2019 10:54:48  27.1N   55.7E Mw=5.3  EMSC   SOUTHERN IRAN                

P:  4FEB2019 113209    28.0N   57.0E 3.5-5.0 CAAAA  So. Iran/Persian Gulf      

 

The earthquake of M 5.3 in Nicaragua/El Salvador was the strongest within  about 150 km of that epicenter since an M 5.3 on July 27, 2018 and prior to that an M 5.6 on May 6, 2018 Forecast 113186 had expected today's event was likely within this area around February 11.

 

O: 11FEB2019 00:08:48  13.2N   87.7W Mw=5.3  EMSC   GOLFO DE FONSECA, EL SALVADOR

P: 11FEB2019 113186    13.0N   87.0W 3.5-5.1 AAAAA  Nicaragua                  

 

The moderate earthquakes in Tonga of M 5.1 and 4.5 were felt in their epicentral zones. They may have been promoted by Tropical Cyclone Neil which was in the area at the time of these events. This had been anticipated in this summary in  the previous issue as:

 

"TC Neil formed today in the region of Tonga with winds up to 45 kts. It is expected to track to the southeast over the next several days. Seismic enhancement in the region of Tonga and Fiji could accompany the passage of this storm through the area." (February 9-10, 2019)

 

Forecast 113363 expected this activity in early February.

 

NEIC reported this earthquake of M 5.1 in Tonga was felt with intensity II-III in the area(s) of Samoa.  NEIC reported the earthquake of M 4.5 in Tonga was felt with intensity II-III in the area(s) of Apia, Samoa.

 

O: 10FEB2019 13:27:10  15.2S  173.7W mb=5.1  EMSC   TONGA                        

O: 10FEB2019 17:12:55  16.8S  174.5W mb=4.5  EMSC   TONGA                        

P:  3FEB2019 113363    17.0S  173.0W 4.0-5.7 CAAAA  Tonga Islands              

 

The earthquake of M 5.2 in the Philippines was an aftershock of the M 5.9 that

hit the area of northern Mindanao two days ago. PHIVOLCS reported the M 4.2 was felt with intensity III in General Luna, Surigao Del Norte, Philippines.

The M 5.1-5.2 was reported felt with intensity IV in General Luna, Surigao Del Norte, and II in Surigao City, Philippines. Forecast 113180 expected this activity was likely in Northern Mindanao around February 9.

 

O: 10FEB2019 14:33:38   9.9N  126.3E Mw=5.2  EMSC   MINDANAO, PHILIPPINES         

O: 10FEB2019 14:39:02  09.9N  126.5E MS=4.2  PHI  Felt with intensity III

O: 10FEB2019 14:33:32  09.9N  126.5E MS=5.1  PHI  Felt with intensity IV

O: 10FEB2019 16:48:51   9.9N  126.4E mb=4.6  EMSC   MINDANAO, PHILIPPINES        

P:  9FEB2019 113180    11.0N  126.0E 3.5-5.1 AAAAA  Luzon, Philippines         

 

An earthquake of M 3.6 east of Los Angeles, California today was widely felt in the Los Angeles, California area. NEIC reported maximum intensity IV in Hemet, Beaumont,  and II-III in Winchester, Banning, Homeland, Palm Springs, Nuevo, Temecula, Murrieta, Menifee, Sun City, Mountain Center, Cathedral Citym Moreno, Perris, Rancho Mirage, Palm Desert, Yucaipa Wildomar, Redlands, Indian Wells, Lake Elsinore, La Quinto, Riverside, Idyllwild, San Jacinto, Anza, and in general within about 100 km of the epicenter. The last earthquakes within about 50 km of today's epicenter with M>=3.6 occurred as an M 3.7 and 3.8 on November 9, 2018. The last of significantly larger magnitude in the region was an M 4.4 on August 15, 2018, the largest in the area since an M 5.2 on June 10, 2016. Forecast 113254 had expected today's event in this area was likely around February 8.

 

O: 10FEB2019 17:12:24  33.7N  116.8W ML=3.6  EMSC   SOUTHERN CALIFORNIA          

P:  8FEB2019 113254    33.7N  116.1W 2.5-4.4 AAAAA  So. California             

 

The strongest earthquake in the U.S. or Canada today occurred in northwestern Alaska with M 4.8. It was followed by a series of aftershocks of M 3.0-3.5. NEIC reported this earthquake of M 4.8 in Northern Alaska was felt with intensity II-III in the area(s) of Nulato, Alaska. The last earthquake within about 200 km of this epicenter with M>=4.8 occurred more than 10 years ago on October 28, 2008 with M 4.9. An earthquake of M 5.3 hit about 200 km northeast of today's epicenter on October 14, 2018. The only other such event in this region in the past 30 years was an M 5.1 on November 13, 2003.

 

O: 10FEB2019 14:09:43  66.3N  157.2W ML=3.2  EMSC   NORTHERN ALASKA              

O: 10FEB2019 13:35:47  66.3N  157.2W mb=4.8  EMSC   NORTHERN ALASKA              

O: 10FEB2019 22:20:58  66.3N  157.2W ml=3.0  EMSC   NORTHERN ALASKA              

O: 10FEB2019 22:46:48  66.3N  157.2W ml=3.1  EMSC   NORTHERN ALASKA              

O: 10FEB2019 16:56:45  66.3N  157.3W ML=3.3  EMSC   NORTHERN ALASKA              

 

A moderate earthquake of M 4.2 also occurred near Vancouver Island, B.C. Canada. NEIC reported this earthquake of M 4.2 in Vancouver Island, B.C., Canada was felt with intensity II-III in the area(s) of Vancouver,, Canada.  Earthquakes are common in this region, but seldom reach this magnitude level. An M 4.2 occurred near this on January 17, 2019 and an M 4.7 on December 1, 2018 after a lull since August 21, 2018. Earthquakes Canada has substantially more date on seismicity of this region not in the NEIC Database. Forecast 113318 had expected today's event was likely around February 7.

 

O: 11FEB2019 00:02:01  50.7N  130.0W mb=4.2  EMSC   VANCOUVER ISLAND, CANADA REGIO

P:  7FEB2019 113318    50.7N  130.5W 3.0-5.1 BAAAA  British Colombia           

 

GLOBAL SEISMICITY REDUCED

 

EARTHQUAKE SUMMARY FOR FEBRUARY 9, 2019

 

As geomagnetic and tidal effects on seismicity diminished today, global seismicity was also reduced. The strongest earthquakes of the day were of M 5.0-5.2 and occurred in areas where activity has been strong over the past week. These include the Molucca/Halmahera area of Indonesia (M 5.2); northern Chile (M 5.1); Northern Mindanao, Philippines (M 5.2); and the Myanmar-India border (M 5.2).  None of these were damaging but most were felt in their respective epicentral areas. Tropical Cyclone Neil formed in the Tonga/Fiji region where events of M 4.8 and 4.9 occurred today. This storm could encourage elevated seismicity in the Tonga/Fiji region over the next several days.

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in the Near Islands, Aleutians, Alaska. It was not reported felt in the epicentral area. The last earthquake in the Near Islands within about 200 km of this epicenter with M>=4.5 occurred on October 26, 2018 with M 4.5-4.6 and prior to that on July 10, 2018 also with M 4.6. The last such event in the area with significantly larger magnitude than M 4.5 was an M 5.1 on August 8, 2017. Forecast 11332 had expected a moderate event in this region around February 5.

 

O:  9FEB2019 10:34:00  53.3N  172.7E mb=4.5  EMSC   NEAR ISLANDS, ALEUTIAN ISLANDS

P:  5FEB2019 113322    55.0N  169.0E 4.0-6.1 BBBAA  Near Islands               

 

An outer-rise earthquake of M 3.6 occurred south of the Aleutians in the Fox Islands area today. Outer-rise events can be indicator of stress down slope in the subduction zone and have been used to identify area which may see a large to major upcoming earthquake. Forecast 113321 had expected activity in this area was likely around February 10.

 

O:  9FEB2019 14:18:37  50.8N  170.4W ml=3.6  EMSC   SOUTH OF ALEUTIAN ISLANDS    

P: 10FEB2019 113321    52.4N  169.4W 3.5-5.2 ABAAA  Fox Islands, Aleutians     

 

Seismicity in California today continued at quiet levels. Today was the 48th anniversary of the M 6.7 San Fernando, California earthquake of 1971. The pattern in the area today included events south of Los Angeles, in the Channel Islands and west in the valleys which are similar to precursory activity in the region in February, 1971 and before the Northridge earthquake of January 1994. As earthquakes of M>6 in  the area tend to recur in 20-25 year cycles, it is possible that another significant earthquake in the area is near. Factors which could increase this probability include cyclones in the region east of Madagascar, strong geomagnetic or solar storms,  and strong tidal effects among others.

 

STRONG EARTHQUAKE SHAKES NORTHERN MINDANAO, PHILIPPINES

 

EARTHQUAKE SUMMARY FOR FEBRUARY 8, 2019

 

The strongest earthquake in the world today was an M 5.9 in Northern Mindanao, Philippines. NEIC reported maximum intensity V in Caraga, Philippines at Purok and Pilar; IV in Santa Fe Matalon, Leyte and II-III in Caraga at Union, Carrascal, Dana, Cabadbaran, Butuan and in the Eastern Visayas at Sogod and Maasin. PHIVOLCS reported it was felt with intensity V in General Luna, Del Carmen, Pilar, Carrascal and Mainit, Surigao Del Norte, Cortes and Bayabas, Surigao Del Sur, Surigao City, Talacogon, Agusan Del Sur, Butuan City; IV in Hinatuan, Surigao Del Sur, Tandag City, Gingoog City, Limasawa, San Francisco, Hinunangan, San Ricardo and San Juan, Southern Leyte; III in Palo, Abuyog, Julita, Tanauan, San Miguel, Bato, Leyte, Medina, Tagoloan, Jasaan, and Salay, Minamis Oriental, Kaillangan and Libona, Bukidnon, San Francisco, Agusan del Sur, Nabunturan, Compostella Valley, Cagayan De Oro City; LLigan City, Tacloban City, Davao City; II in Jaro and Leyte, Leyte, Mainbajao, Camiguin, El Salvador City, Manolo, Fortich, Bukidnon,, Bislig City and I in Dipolog City, Philippines. Aftershocks followed and were felt with moderate intensity in the epicentral area. The last earthquake within about 250 km of this epicenter with M>=5.9 occurred two years ago to the northwest on February 10, 2017 with M 6.5.Foredast 113180 had expected a moderate event in the area around February 9.

 

Forecasts 113180 had expected this activity in Mindanao was likely around

February 5-9.

 

O: 08FEB2019 17:01:34   9.8N  126.2E mb=4.6  EMSC   MINDANAO, PHILIPPINES

O: 08FEB2019 20:10:25   9.8N  126.3E mb=4.7  EMSC   MINDANAO, PHILIPPINES

O: 08FEB2019 20:37:50   9.8N  126.3E mb=4.8  EMSC   MINDANAO, PHILIPPINES

O: 08FEB2019 21:10:06   9.8N  126.4E Mw=5.0  EMSC   MINDANAO, PHILIPPINES

O: 08FEB2019 16:09:25   9.8N  126.4E mb=5.0  EMSC   MINDANAO, PHILIPPINES

O: 08FEB2019 11:55:06   9.8N  126.5E Mw=5.9  EMSC   MINDANAO, PHILIPPINES

O: 08FEB2019 15:28:39   9.8N  126.5E mb=4.7  EMSC   MINDANAO, PHILIPPINES

O: 08FEB2019 12:35:42   9.9N  126.3E mb=4.7  EMSC   MINDANAO, PHILIPPINES

O: 08FEB2019 21:48:23   9.9N  126.4E mb=4.6  EMSC   MINDANAO, PHILIPPINES

O: 08FEB2019 17:02:42   9.9N  126.4E mb=4.9  EMSC   MINDANAO, PHILIPPINES

O: 08FEB2019 12:45:38   9.9N  126.4E mb=5.1  EMSC   MINDANAO, PHILIPPINES

O:  8FEB2019 11:55:08   9.8N  126.5E mw=5.9  ANSS   General Luna Philippines     

O: 08FEB2019 11:55:06  09.8N  126.5E MS=5.9  PHI  Felt with intensity V

P:  9FEB2019 113180    11.0N  126.0E 3.5-5.1 ABAAA  Luzon, Philippines         

 

NEIC reported an earthquake of M 5.0 in Northern Mindanao, Philippines was felt with intensity II-III in the area(s) of Union, Caraga and Cagayan, Northern Mindanao, Philippines.

 

O:  8FEB2019 12:29:23  10.0N  126.2E mb=5.0  EMSC   PHILIPPINE ISLANDS REGION    

P:  5FEB2019 113180    10.0N  126.0E 3.5-5.2 BAAAA  Luzon, Philippines         

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 in the Fox Islands, Aleutians, Alaska. It was not reported felt in this remote area. An aftershock of M 3.3 followed about 3.5 hours later. A similar M 3.8 hit the same epicenter on February 7. Forecast 113317 had expected activity in this area in early February.

 

O:  8FEB2019 08:30:02  52.5N  169.8W mb=3.7  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  2FEB2019 113317    52.3N  171.3W 3.5-5.3 CAAAA  Andreanoff Isls, Aleutians 

 

O:  8FEB2019 12:04:27  51.9N  170.0W ml=3.3  EMSC   FOX ISLANDS, ALEUTIAN ISLANDS

P:  6FEB2019 113317    52.1N  172.8W 3.5-5.3 AABAA  Andreanoff Isls, Aleutians 

 

Seismicity in California was active in the M 2-3 range today but no events of M>=3 occurred and the swarms in the Landers area and the moderate quake in the northern coastal area discontinued. This may be due to lessening tidal stresses and/or the conclusion of the geomagnetic storm which appear to have helped promote this regional activation.

 

The most unusual earthquake in the U.S. or Canada was an M 3.1 in Ontario, Canada. NEIC reported this earthquake of M 3.1 in Ontario, Canada was felt with intensity II-III in the area(s) of Sudbury, Ontario, Canada.  This is the strongest event within about 100 km of this epicenter since an M 3.1 on September 30, 2015 more than three years ago. The last of larger magnitude

in this area was an M 3.8 on August 5, 2014. Forecast 113047 had expected this event was likely within about 50 km of the epicenter at the end of January or early February.

 

O:  8FEB2019 07:23:37  46.5N   81.2W mb=3.1  EMSC   ONTARIO, CANADA               

P: 30JAN2019 113047    46.0N   81.0W 2.0-4.1 CAAAA  Ohio/Lake Erie             

 

STRONG SWARM EAST OF LOS ANGELES, CALIFORNIA; MODERATE QUAKE SOUTH OF HAWAII

 

EARTHQUAKE SUMMARY FOR FEBRUARY 7, 2019

 

An earthquake of M 4.0 in the area of Southern California near Ludlow east of Los Angeles  was widely felt today. It was followed by a series of lightly felt aftershocks. Several light foreshocks including an M 3.2 also occurred. NEIC reported the mainshock was felt lightly with intensity II-II in Ludlow, Newberry Springs, Joshua Tree, Yucca Valley, Twentynine Palms, Apple Valley, Indian Wells, La Quinto, Ontario and in general within about 100 km of the epicenter. This is the strongest earthquake in this region within about 75 km of this epicenter since February 23, 2016 and February 20, 2016 with M 4.1 and 4.3 respectively. A major earthquake of M 7.3 hit this area near Lander, California on June 28, 1992. Forecast 113259 had expected this activity was likely around February 7. This summary had anticipated regional seismicity would be enhanced at this time as:

 

"The area of Southern California, especially in the area east of Los Angeles ...

Seismicity in the Los Angeles area often increases in January and February. This includes the Northridge quake of  January 16, 1994 (M 6.7) and the San Fernando earthquake of February 9, 1971 (M 6.7). The time for stress to build up in the area may be about 23-25 years, consistent with the possibility of another such event on the horizon. This summary has noted this relation in the past. The Northridge event was preceded by a series of light earthquake south and west of Los Angeles not unlike the series which is now occurring. These may precede a moderate earthquake in the area." (January 31, 2019; February 6-7, 2019)

 

O: 07FEB2019 08:30:03  34.7N  116.3W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 07FEB2019 16:48:20  34.7N  116.3W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 07FEB2019 16:58:04  34.7N  116.3W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 07FEB2019 18:02:02  34.7N  116.3W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 08FEB2019 04:08:09  34.7N  116.3W Ml=2.0  EMSC   SOUTHERN CALIFORNIA

O: 07FEB2019 17:09:58  34.7N  116.3W Ml=2.1  EMSC   SOUTHERN CALIFORNIA

O: 07FEB2019 16:16:57  34.7N  116.3W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 07FEB2019 16:29:12  34.7N  116.3W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 07FEB2019 20:13:37  34.7N  116.3W Ml=2.2  EMSC   SOUTHERN CALIFORNIA

O: 08FEB2019 00:03:37  34.7N  116.3W Ml=2.3  EMSC   SOUTHERN CALIFORNIA

O: 07FEB2019 15:56:50  34.7N  116.3W Ml=2.4  EMSC   SOUTHERN CALIFORNIA

O: 07FEB2019 16:56:30  34.7N  116.3W Ml=2.4  EMSC   SOUTHERN CALIFORNIA

O: 08FEB2019 00:06:51  34.7N  116.3W Ml=2.4  EMSC   SOUTHERN CALIFORNIA

O: 08FEB2019 00:49:41  34.7N  116.3W Ml=2.4  EMSC   SOUTHERN CALIFORNIA

O: 08FEB2019 04:06:50  34.7N  116.3W Ml=2.5  EMSC   SOUTHERN CALIFORNIA

O: 08FEB2019 01:52:31  34.7N  116.3W Ml=2.6  EMSC   SOUTHERN CALIFORNIA

O: 07FEB2019 16:44:33  34.7N  116.3W Ml=2.7  EMSC   SOUTHERN CALIFORNIA

O: 07FEB2019 19:32:53  34.7N  116.3W Ml=2.7  EMSC   SOUTHERN CALIFORNIA

O: 08FEB2019 01:57:09  34.7N  116.3W Ml=2.9  EMSC   SOUTHERN CALIFORNIA

O: 07FEB2019 08:24:37  34.7N  116.3W Ml=3.2  EMSC   SOUTHERN CALIFORNIA

O: 07FEB2019 16:14:55  34.7N  116.3W Mw=3.5  EMSC   SOUTHERN CALIFORNIA

O: 07FEB2019 16:41:24  34.7N  116.3W Mw=4.0  EMSC   SOUTHERN CALIFORNIA

O:  7FEB2019 14:16:39  34.7N  116.3W ML=2.7  EMSC   SOUTHERN CALIFORNIA          

P:  7FEB2019 113259    34.6N  116.7W 2.5-4.4 AAAAA  So. California             

 

The largest earthquake in the world today was an M 5.4 in the Southwest Indian Ridge. It was not reported felt in the epicentral area. This epicenter is nearly antipodal to the earthquake in Southern California. Seismic energy from this may change the nature of the swarm in Southern California with the potential to enhance larger events in the region. The last earthquake on the Southwest Indian Ridge within about 200 km of this epicenter with M>=5.4 occurred on July 10, 2018 with M 5.6 and prior to that on July 12, 2016 (M 5.4). Only one event in the area has exceeded M 6.0 in the past 20 years  - an M 6.1 on August 17, 2013.    Forecast 113391 had expected today's event within about 25 km was likely around February 6.

 

O:  8FEB2019 03:11:06  32.8S   57.1E mb=5.4  EMSC   SOUTHWEST INDIAN RIDGE       

O: 08FEB2019 03:11:05  32.8S   57.1E mb=5.4  ANSS   Southwest Indian Ridge"

P:  6FEB2019 113391    33.0S   57.0E 4.0-5.6 AAAAA  So. Indian Ocean           

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 south of Hawaii.  This is the largest earthquake south of Hawaii within about 200 km since an  NEIC reported this earthquake of M 4.6 south of Hawaii  was felt with intensity II-III in the area(s) of Naalehu, Captain Cook, Kealakekua, Honolulu, Kailua, Hilo, Waikoloa, Kamuela, Pahoa and Papaikou, Hawaii.  M 5.2 on June 5, 2013 and prior to that an M 4.8 on October 23, 2009. Forecasts 113199 and 112975 had expected this activity in early February.

 

O:  7FEB2019 19:06:58  18.5N  156.3W mb=4.5  ANSS   HAWAII REGION, HAWAII        

O:  7FEB2019 19:06:58  18.5N  156.3W mb=4.4  EMSC   HAWAII REGION, HAWAII        

P:  4FEB2019 113199    20.3N  155.1W 4.0-5.8 BBAAA  Hawaii area                

P: 30JAN2019 112975    20.1N  156.1W 4.0-5.5 CBAAA  Hawaii area                

 

An earthquake of M 5.4 also occurred in the Molucca and Halmahera, Indonesia region. This continues strong, expected activation of the region associated with the new moon. This had been discussed in the previous issue of this summary as:

 

 

"Strong earthquakes which occurred at the time of the previous new moon on January 6 included an M 5.8 in the Andreanof Islands, Alaska; an M 6.8 deep beneath Brazil; an M 6.6 in the Molucca area of Indonesia and an M 6.3 in Kyushu, Japan. These areas may see additional moderate to strong seismicity at this time." (February 1-6, 2019)

 

The last earthquake within about 200 km of this epicenter with M>-5.7 occurred on January 6, 2019 with M 6.6 and prior to that on April 15, 2018 (M 5.9). Today's event is probably an aftershock of the January, 2019." (February 6-7, 2019)

 

Forecast 113139 had anticipated today's activity was likely within about 50 km around February 7.

 

O:  7FEB2019 10:03:08   2.3N  128.8E mb=5.4  EMSC   HALMAHERA, INDONESIA         

O: 07FEB2019 10:03:08   2.2N  128.8E mb=5.4  ANSS   ENE of Tobelo Indonesia

O:  7FEB2019 09:40:25   2.9N  129.1E ML=4.5  EMSC   HALMAHERA, INDONESIA         

O:  8FEB2019 00:23:47   4.0N  128.6E ML=4.5  EMSC   NORTH OF HALMAHERA, INDONESIA

P:  7FEB2019 113139     3.0N  129.0E 4.0-5.5 AAAAA  Halmahera                  

 

MODERATELY STRONG SEISMICITY CONTINUES ALONG GEOMAGNETIC EQUATOR

 

EARTHQUAKE SUMMARY FOR FEBRUARY 6, 2019

 

A series of moderately strong quakes hit along the geomagnetic equator in the Southwest Pacific today and in South America in northern Chile (M 5.3). These included an M 5.4 in the Central Philippines; M 5.7 in the Molucca Sea; an M 5.7 in Sulawesi and an M 5.5 in the Solomon Islands. As noted in previous issues of this summary, this was activity expected to be related to the recent geomagnetic storm and the new moon tides as:

 

 

"The new moon will arrive on February 4, 2019 at 21:04 UT. Longitudes which  are sub-lunar at this time are near 45 East and those which are sub-solar at near 135 West longitude. These are the zones which will experience maximum tidal stresses at this time. In the west they include western North America and Eastern Alaska and in the east, the Middle East and eastern Africa." (February 1-5, 2019)

 

and

 

"This is the strongest geomagnetic storm in more than a month (especially at high latitudes) since AP reached 24 on  December 28, 2018. Seismicity is expected to increase with a possible strong event near the geomagnetic equator and at high latitudes over the next three days as geomagnetic effects and the new moon promote fault slippage." (February 1-4, 2019)

 

Moderately strong earthquakes hit the region of Indonesia in the Molucca and Sulawesi areas. NEIC reported an M 5.7 was felt with intensity IV in Bitung and II in Manado, Sulawesi, Indonesia. BMG reported it was felt with intensity III-IV in Manado, Minahasa, Bitung, Ternate and Minahasa, Molucca, Indonesia. The last earthquake within about 200 km of this epicenter with M>-5.7 occurred on January 6, 2019 with M 6.6 and prior to that on April 15, 2018 (M 5.9). Today's event is probably an aftershock of the January, 2019 event as suggested in  earlier issues of this report:

 

"Strong earthquakes which occurred at the time of the previous new moon on January 6 included an M 5.8 in the Andreanof Islands, Alaska; an M 6.8 deep beneath Brazil; an M 6.6 in the Molucca area of Indonesia and an M 6.3 in Kyushu, Japan. These areas may see additional moderate to strong seismicity at this time." (February 1-6, 2019)

 

 

Forecast 113138 had expected this area to be active around February 8.

 

O:  7FEB2019 04:15:29   1.4N  126.5E Mw=5.7  EMSC   MOLUCCA SEA                  

P:  8FEB2019 113138     1.0N  128.0E 4.0-5.4 AABAA  Halmahera                  

 

An earthquake of M 5.5 also hit the Solomon Islands where it was reported with intensity II-III in Buala, Isabel and Honiara, Guadalcanal, Solomon Islands. This epicenter is located within about 5 degrees of the local geomagnetic equator. The last earthquake within about 200 km of this epicenter with M>=5.5 was an M 6.0 on March 19, 2017. Forecast 113355 had expected a moderate earthquake in this area was likely in early February.

 

O:  7FEB2019 01:41:34   8.5S  161.0E mb=5.5  EMSC   SOLOMON ISLANDS              

P:  2FEB2019 113355    10.0S  162.0E 4.0-5.4 BBAAA  No. of Santa Cruz Islands  

 

The M 5.3 in northern Chile was reported by NEIC to have been felt with intensity IV in Iquique and II in Arica, Tarapaca, Chile. CSN reported this earthquake was felt with intensity  III in  Tarapaca at Alto Hospicio, Huara, Iquique, La Tirana and II in Pica and in Arica and Parinacota at Arica with intensity III. NEIC reported these earthquake of M 4.5 and 4.2 in Northern Chile were felt with intensity II-III in the area(s) of Iquique, Tarapaca, Chile.  Moderate aftershocks were felt in the same area. This epicenter lies about 5 degrees south of the local geomagnetic equator. The last event in Tarapaca within about 150 km of this epicenter with M>=5.2 occurred on April 5, 2018 with M 5.6.An M 6.2 occurred about 200 km to the northeast on November 1, 2018.

Forecast 113379 had expected today's event was likely within this area around February 6. These earthquakes are located at 103 degrees from the M 7.1 near Anchorage, Alaska of November 30, 2018 and may have been promoted by energy from that source.

 

O:  6FEB2019 18:50:40  19.9S   71.1W Mw=4.2  EMSC   OFF COAST OF TARAPACA, CHILE 

O:  6FEB2019 17:56:49  19.9S   71.1W Mw=5.2  EMSC   OFF COAST OF TARAPACA, CHILE 

O:  6FEB2019 22:58:18  20.0S   71.1W Mw=4.5  EMSC   OFF COAST OF TARAPACA, CHILE 

P:  6FEB2019 113379    20.0S   70.0W 4.0-5.5 AAAAA  So. Peru/Bolivia           

 

The M 5.4 in the Central Philippines was reported by NEIC to have been felt with intensity II in Ilocos, Philippines at Bolingit, Nilombot, Santo Domingo, Lingayen, and in Central Luzon at Angeles, Bibiclat, Plaridel, Baguio, Mabalacat, Philippines. PHI reported it was felt with intensity V in Villasis, Pangasinan; IV in Baguio City and II in Subic, Zambales, Pasay City, Manila City, Mandaluyong City and Quezon City, Philippines. The last earthquake within about 200 km of this epicenter with M>=5.4 occurred on July 3, 2018 also with M 5.4 and prior to that on June 17, 2018 with M 5.4. The last of larger magnitud was an M 5.7 on October 2, 2016.  Forecasts 113180 and 113181 had expected this activity was likely around February 5-6.

 

O:  6FEB2019 10:25:20  15.8N  120.6E Mw=5.4  EMSC   LUZON, PHILIPPINES           

P:  5FEB2019 113181    18.0N  120.0E 3.5-4.9 ACAAA  Luzon, Philippines         

P:  6FEB2019 113180    14.0N  122.0E 3.5-5.1 ABBAA  Luzon, Philippines         

 

The strongest earthquake in the U.S. or Canada today was an M 4.4 in Northern California. This is the latest in a series of events which are migrating from west to east and included an M 4.5 earthquake and aftershocks off the coast of Northern California and an unusual series on the coast. Today's event was reported with  maximum intensity IV in Willow Creek, California and moderate shaking in California at Blue Lake, Korbel, Arcata, Bayside, McKinleyville, Salyer, Eureka and Samoa, California among others within about 100 km of this epicenter.

 

This is the strongest earthquake in Northern California within about 50 km of this epicenter since an M 4.5 on August 28, 2015, an aftershock of an M 4.7 of July 21, 2106. A moderate earthquake of M 5.6 hit about 50 km to the north of today's epicenter on February 13, 2012. Forecast 113224 had expected a moderate earthquake was possible in this area in early February. This had been emphasized in earlier issues of this summary as:

 

 

"The area of California saw increasing seismicity today after several days of relative quiet. Light earthquakes occurred near Los Angeles and San Francisco with M 2.8. The M 2.8 in the San Francisco Bay area was followed by an M 2.2. These epicenters are located off the coast of San Francisco. Light to moderate earthquake in this area occasionally are followed by stronger events in the land area near San Francisco. One of the more interesting of these occurred on April 11, 1906 and followed a major earthquake in the Gulf of California of M 7.5 on April 10, 1906. These preceded the great M 8.3 quake in San Francisco on April 18, 1906. Further activity with a possible moderate event is likely in this area in the next week to ten days. A major solar or geomagnetic storm or the full moon of February 4, 2019. This tidal event is strongest in the area of California maximizing at 21:04 UT - near local solar noon and could trigger enhanced activity in California at that time. A further promoter of seismicity  in this area at this time is the M 7.1 in Mindanao, Philippines of December 29, 2018. This epicenter is located at 103 degrees from Central California, a distance at which triggering is likely from concentrated energy from Mindanao." (January 31, 2019).

 

This event is located at 101 degrees from the Molucca Sea M 7.0 of December 29, 2018 and was probably enhanced by concentrated seismic energy from that source.

 

The area of Southern California, especially in the area east of Los Angeles was also noted at the time as being subject to moderate seismicity at this time as:

 

"Seismicity in the Los Angeles area often increases in January and February. This includes the Northridge quake of  January 16, 1994 (M 6.7) and the San Fernando earthquake of February 9, 1971 (M 6.7). The time for stress to build up in the area may be about 23-25 years, consistent with the possibility of another such event on the horizon. This summary has noted this relation in the past. The Northridge event was preceded by a series of light earthquake south and west of Los Angeles not unlike the series which is now occurring. These may precede a moderate earthquake in the area." (January 31, 2019)

 

 

O:  6FEB2019 18:35:04  40.8N  123.8W Md=2.4  EMSC   NORTHERN CALIFORNIA          

O:  6FEB2019 18:23:01  40.8N  123.8W mb=4.4  EMSC   NORTHERN CALIFORNIA          

P:  2FEB2019 113224    39.7N  123.7W 2.5-4.7 BBAAA  Central California         

 

EARTHQUAKE IN AZERBAIJAN PROBABLY TIDALLY TRIGGERED

 

EARTHQUAKE SUMMARY FOR FEBRUARY 5, 2019

 

An unusual earthquake of M 5.1 shook the area of Azerbaijan today. NEIC reported maximum shaking IV in Parsabad, Ardabil, Iran and II-III in Navur, Armenia and in Azerbaijan at Zig Balq, Mugan, Resulzada, Baku, Kesla, Ohmadli. The quake was generally felt within about 150 km of the epicenter. No major damage or casualties were initially reported. This event follows activation of the North Anatolian Fault zone which included an M 5.5 in Greece yesterday. Today's event occurred within about an hour of local solar midnight near the longitude of maximum tidal stress with the new moon and was probably promoted by tidal effects. In previous issues this summary had noted the potential for enhanced seismicity in this area as:

 

"The new moon will arrive on February 4, 2019 at 21:04 UT. Longitudes which

are sub-lunar at this time are near 45 East and those which are sub-solar at near 135 West longitude. These are the zones which will experience maximum tidal stresses at this time. In the west they include western North America and eastern Alaska and in the east, the Middle East and eastern Africa." (February 1-5, 2019)

 

"Other moderate activity near the eastern longitude of maximum stress with the new moon occurred in eastern Turkey where an event of M 4.0 occurred." (February 4-5, 2019)

 

The earthquake of M 5.1 in Azerbaijan today was the largest within about 200 km  of this epicenter since an M 5.1 on November 15, 2017. Both may be aftershocks of an M 6.4 which occurred August 11, 2012 about 200 km southwest of today's epicenter.   Forecast 113286 had expected this activity within this area was likely in early February.

 

O:  5FEB2019 13:24:53  38.9N   48.5E ML=3.9  EMSC   AZERBAIJAN                   

O:  6FEB2019 02:25:50  40.8N   48.5E ML=3.9  EMSC   AZERBAIJAN                   

O:  5FEB2019 19:19:54  40.8N   48.5E ML=4.4  EMSC   AZERBAIJAN                   

O:  5FEB2019 19:31:36  41.0N   48.7E Mw=5.1  EMSC   AZERBAIJAN                   

P:  1FEB2019 113286    40.0N   50.0E 4.0-5.5 BAAAA  Kazakhstan                 

 

Another area which may have been promoted by tidal stresses today was Pakistan and northern India. An M 5.5 occurred today in Northwestern Kashmit near local solar midnight.  NEIC reported this earthquake of M 5.3 in Pakistan was felt with intensity V in Gilgit, northern Pakistan;IV in Jammu and Kashmir, India at Sopur, Handwaram, and II-III in the area(s) of Kashmir and NW Frontier, Pakistan at Muzafferabad Azad, Mansehra, Abottabad, Islamabad and in India in Jammu and Kashmir at Badami Bagh, Srinagar.  The last earthquake of M>=5.5 within about 150 km of this epicenter occurred on October 8, 2005 of M 7.6 and was highly damaging in the area about 150 km southwest of today's epicenter. Forecast 112992 had expected a moderate quake in this area was likely at the end of January or early February. This activity is located at 104-106 degrees from the Loyalty Islands where a strong swarm occurred in December, 2018 and may have been promoted by energy from that source. The M 6.6 and aftershocks in Chiapas, Mexico of the past three days is located at similar distances from the Loyalty Islands.

 

O:  5FEB2019 13:38:35  35.1N   74.1E mb=4.4  EMSC   NORTHWESTERN KASHMIR         

O:  5FEB2019 16:47:09  35.1N   74.2E mb=5.5  EMSC   NORTHWESTERN KASHMIR         

O:  5FEB2019 21:11:32  35.3N   74.0E mb=4.3  EMSC   NORTHWESTERN KASHMIR         

P: 31JAN2019 112992    35.0N   74.0E 3.8-5.4 BAAAA  Hindu Kush/Pakistan         

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 in the Andreanof Islands, Aleutians, Alaska. Earthquakes of M>=4.1 within about 150 km of this epicenter area common but this may be an aftershock of an M 4.7 which occurred January 31, 2019. Forecast 113316 had expected activity in this area around February 3.

 

O:  5FEB2019 10:32:45  52.0N  178.6W mb=4.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  3FEB2019 113316    50.8N  175.8W 3.5-5.1 ABBAA  Andreanoff Isls, Aleutians 

 

NEW MOON BRINGS ACTIVE SEISMICITY

 

EARTHQUAKE SUMMARY FOR FEBRUARY 4, 2019

 

Moderately large earthquakes of M 5.8-6.1 occurred at the antipodal areas of Ecuador and Sumatra today. Both appear to have been promoted by geomagnetic and tidal stresses but the antipodal relation between them should not be ignored

When large earthquakes occur the surface seismic energy focuses at the antipode due to the near-spherical shape of the earth. This concentration of energy at the antipode (the point directly opposite on the surface of the earth to the epicenter) can help promote seismicity at th antipode as it appears to have done in this case.

 

A moderately large earthquake of M 5.8 shook Ecuador within minutes of local solar noon today. NEIC reported maximum shaking with intensity V in Ecuador at Eloy Alfaro, Guayas and IV in Guayaquil and Santa Lucia. Intensity II-II occurred at Samborondon, Machala, Cuenca, Pajan, Santa Elena, Salinas, and Guaranda. The timing of this earthquake with the new moon strongly suggests tidal promotion. This event is also near the geomagnetic equator and may have been promoted by geomagnetic processes. This is the strongest earthquake in Ecuador within about 200 km of this epicenter since an M 6.2 on September 7, 2018 and prior to that an M 6.3 on May 21, 2005. Other such events have occurred about 200 km north or west of today's epicenter since.  Forecast 113149 had expected this event in this region of Ecuador was likely around February 2.

 

O:  4FEB2019 17:45:47   2.4S   79.9W Mw=5.8  EMSC   NEAR COAST OF ECUADOR        

P:  2FEB2019 113149     2.0S   78.0W 4.0-5.4 AABAA  Ecuador                    

 

An earthquake in Sumatra of M 5.8 also occurred within about an hour of local solar midnight and may have been promoted by tidal effects from the new moon. BMG  reported this earthquake was felt with intensity III in Nias Selatan, Pasaman, Bukit Tinggi, Padang Panjang, Pariaman, Padang and Payakumbu, Sumatra, Indonesia. Like the earthquake in Ecuador, this earthquake is located near the geomagnetic equator and was probably promoted by the current geomagnetic storm. This potential had been summarized in previous issues of this summary as:

 

"This is the strongest geomagnetic storm in more than a month (especially at high latitudes) since AP reached 24 on December 28, 2018. Seismicity is expected to increase with a possible strong event near the geomagnetic equator and at high latitudes over the next three days as geomagnetic effects and the new moon promote fault slippage." (February 1-4, 2019)

 

The last earthquake within about 150 km of this epicenter of M>=5.8 occurred on November 29, 2018 with M 5.8. The last of larger magnitude in this area was an M 6.3 on August 31, 2017. Forecast 113142 had expected today's earthquake was likely around February 4-5. This epicenter is at 101-102 degrees from the M 7.1 in the Anchorage, Alaska region of November 30, 2018 and may have been promoted by energy from that source. It is also at the fifth node (72 degrees) from the Loyalty Islands where strong activity may have helped promote seismicity at this distance.

 

O:  4FEB2019 22:27:41   0.4S   98.0E mb=4.5  EMSC   KEPULAUAN BATU, INDONESIA    

O:  4FEB2019 19:29:54   0.4S   98.2E Mw=5.8  EMSC   KEPULAUAN BATU, INDONESIA    

O:  4FEB2019 19:29:53   0.5S   98.0E MS=6.1  BMG  Felt with intensity III in Nias

P:  4FEB2019 113142     0.0N   99.0E 4.0-5.4 AAAAA  So. Sumatera               

P:  5FEB2019 113142     0.0N   97.0E 4.0-5.4 AAAAA  Nicobar Islands            

 

An earthquake of M 5.4 shook Greece today. NEIC reported it was felt with intensity IV in Greece at Preveza and II-III in Leukas, Nidrioin, Agrinion, Megala and as far aas about 150 km from the epicenter. No tsunami or damage was reported. This event may have been promoted by new moon tidal effects. Several moderate quakes also occurred in southern Greece today. All these occurred near the longitude of maximum tidal stresses as noted in previous summaries:

 

"The new moon will arrive on February 4, 2019 at 21:04 UT. Longitudes which

are sub-lunar at this time are near 45 East and those which are sub-solar at near 135 West longitude. These are the zones which will experience maximum tidal stresses at this time. In the west they include western North America and eastern Alaska and in the east, the Middle East and eastern Africa." (February 1-2, 2019)

 

The last earthquake of M>=5.4 within about 150 km of this epicenter in western Greece occurred on October 25, 2016 with M 5.5. The last of larger magnitude was an M 6.5 on November 17, 2015. Forecast 113238 had expected this event within this area in early February. The M 5.3 in Greece and the M 5.8 in Ecuador are at 105 degrees from the M 7.1 in the South Sandwich Islands of December 11, 2018 and may have been promoted from that source.

 

O:  5FEB2019 02:26:09  39.0N   20.6E Mw=5.4  EMSC   GREECE                       

P:  2FEB2019 113238    38.0N   22.0E 3.0-4.7 BAAAA  No. Greece                 

P:  8FEB2019 113238    38.0N   21.0E 3.0-4.6 BAAAA  No. Greece                 

 

An M 4.2 also shook the region of Mayotte today. NEIC reported this earthquake of M 4.2 in Mayotte was felt with intensity IV in the area(s) of Dzoudzi, Pamanzi, Mayotte.  This epicenter is at 45 East longitude on the longitude of maximum tidal stresses (45 degrees East longitude). It occurred within about half an hour of local solar midnight, a time when tidal stresses maximize and was probably promoted by those stresses. Forecast 11353 had expected this event was likely around February 5 within about 150 km of this epicenter.

 

O:  4FEB2019 21:31:39  12.9S   45.3E mb=4.2  EMSC   MAYOTTE REGION               

P:  5FEB2019 113353    12.0S   44.0E 3.0-4.6 AAAAA  Mayotte                    

 

Other moderate activity near the eastern longitude of maximum stress with the new moon occurred in eastern Turkey where an event of M 4.0 occurred.  The last event of M>=4 within about 150 km of this epicenter was an M 4.1 on  January 1, 2019 and prior to that an M 4.2 on December 27, 2018 after a  three month lull in regional activity. Forecast 113280 had expected today's activity was likely in early February.

 

O:  5FEB2019 05:18:01  38.8N   38.1E ML=4.0  EMSC   EASTERN TURKEY               

P:  2FEB2019 113280    40.0N   41.0E 3.5-5.3 BBBAA  Caucasus/Caspian Sea       

 

O:  4FEB2019 17:21:07  39.6N   38.6E ML=3.8  EMSC   EASTERN TURKEY               

O:  4FEB2019 18:28:09  39.6N   39.7E ML=3.4  EMSC   EASTERN TURKEY               

P:  2FEB2019 113280    40.0N   41.0E 3.5-5.3 AAAAA  Caucasus/Caspian Sea       

 

An M 5.3 also shook the area of the southern Dominican Republic today. NEIC reported this event with maximum intensity IV in the Dominican Republic at La Romana, Otra Banda La Altagracia, and Los Llanos and Santo Domingo with II-III shaking in Boca de Yuma, Ramon Sntana, San Pedro de Macoris, Hato Major, and in Puerto Rico at Aguada and Mayaguez. In the previous summary a series of small events in the region had been discussed as possible precursory activity to today's event as:

 

"A series of earthquakes in the Dominican Republic today may related to an M 4.5 in Western Australia of February 1. It is near the antipode of that event. Antipodal pairing has been seen before in these two regions. Stronger events in the region including Haiti, the Dominican Republic and Puerto Rico may follow in the next several days." (February 3-4, 2019)

 

The mainshock  occurred within about an hour of local solar noon and may have been enhanced by strong tidal stresses associated with the new moon. At M 5.3 this  is the strongest earthquake in the Dominican Republic within about 150 km of this epicenter since an M 5.8 within about 25 km of this occurred on May 28, 2014. Forecasts 113196 and 113192 expectd this activity was likely around February 3-5.

 

The epicenter is at the fifth node (72 degrees) from the Anchorage, Alaska quake of November 30, 2018 and may have been enhanced by energy from that event.

 

O:  4FEB2019 11:53:22  18.1N   68.2W Md=3.1  EMSC   MONA PASSAGE, DOMINICAN REPUBL

O:  4FEB2019 14:33:48  18.1N   68.6W Mw=5.3  EMSC   DOMINICAN REPUBLIC REGION    

P:  3FEB2019 113196    20.0N   69.0W 3.0-4.6 ABAAA  Bahamas/No. Caribbean      

P:  5FEB2019 113192    18.0N   67.0W 3.4-5.2 AABAA  Puerto Rico                

 

O:  5FEB2019 02:28:26  19.5N   68.5W Md=3.2  EMSC   DOMINICAN REPUBLIC REGION    

P:  3FEB2019 113196    20.0N   69.0W 3.0-4.6 AAAAA  Bahamas/No. Caribbean      

 

A new epicenter became active in Northern California today following the series off the coast of the past two days. NEIC reported the mainshock of M 3.2 in Northern California was felt with intensity IV in Bayside and II-III in the area(s) of California at Eureka, Arcata, Fortuna, Loleta, Kneeland, McKinleyville, Korbel and Emeryville.  A shock of M 2.5 was felt with intensity II in Eureka and Albany, California. This epicenter may have been excited by the swarm of events off hte coast of Northern California over the past two days but is too far east to be part of that series. The mainshock occurred within five minutes of local solar noon and was probably enhanced by strong tidal effects associated with this tidal alignment. The M 3.2 is the strongest earthquake within about 50 km of this onshore epicenter since an M 4.0 on June 24, 2017.

Forecasts 113224 and 113301 had expected activity in this area in early February.

 

O:  4FEB2019 18:19:20  40.7N  124.1W ML=3.2  EMSC   NORTHERN CALIFORNIA          

P:  2FEB2019 113224    39.7N  123.7W 2.5-4.7 AAAAA  Central California         

 

O:  4FEB2019 17:30:55  40.7N  124.1W Md=2.5  EMSC   NORTHERN CALIFORNIA          

P:  7FEB2019 113301    40.3N  124.7W 2.5-4.6 BAAAA  Off Coast of No. Calif     

MODERATE SWARM CONTINUES OFF THE COAST OF NORTHERN CALIFORNIA

 

EARTHQUAKE SUMMARY FOR FEBRUARY 3, 2019

 

Unusual earthquake swarms occurred today in Western Montana and off the coast of

Northern California with maximum magnitudes M 4.3 and 4.5 respectively. The strongest seismic activity in the U.S. or Canada today continued in a swarm of events off the coast of Northern California. Light to moderate quakes in the area today were reported felt on the mainland at Rio Dell, Arcata, (M 3.7); IV in Petrolia and II-III in Ferndale, Rio Dell, Scotia, Fortuna, Loleta, Carlotta, Whitethorn, Eureka (M 4.1); Petrolia and Arcata (M 3.4); IV in Petrolia and Myers Flat, II-III in Ferndale, Rio Dell, Scotia, Fortuna, Hydesville, Loleta, Redcrest, Carlotta (M 4.5); Ferndale, Fortuna, Myers Flat, Eureka (M 3.0;   This swarm had been anticipated over the past week in this summary including  in the previous three summaries and in yesterday's as:

 

"The nature of this swarm suggests it may extend for another day, possibly with a larger event included." (February 2-3, 2019)

 

Today's swarm intensified around local solar noon - at the time of the new moon - a time at which tidal stresses were maximized. In the tidal forecast, this summary had expected this activity as:

 

"The new moon will arrive on February 4, 2019 at 21:04 UT. Longitudes which  are sub-lunar at this time are near 45 East and those which are sub-solar at near 135 West longitude. These are the zones which will experience maximum tidal stresses at this time. In the west they include western North America and eastern Alaska and in the east, the Middle East and eastern Africa. While tidal forces can help promote seismicity in many areas beyond these zones, moderate to large earthquakes are most likely in these zones. A large to major earthquake is likely in the next seven days. Strong earthquakes which occurred at the time of the previous new moon on January 6 included an M 5.8 in the Andreanof Islands, Alaska; an M 6.8 deep beneath Brazil; an M 6.6 in the Molucca area of Indonesia and M 6.3 in Kyushu, Japan. These areas may see additional moderate to strong seismicity at this time." (February 2-4, 2019)

 

At the end of January this summary had noted the increased likelihood of enhanced seismicity in the area of central and northern California with the new moon as:

 

"A major solar or geomagnetic storm or the full moon of February 4, 2019. This tidal event is strongest in the area of California maximizing at 21:04 UT - near local solar noon and could trigger enhanced activity in California at that time. A further promoter of seismicity  in this area at this time is the M 7.1 in Mindanao, Philippines of December 29, 2018. This epicenter is located at 103 degrees from Central California, a distance at which triggering is likely from concentrated energy from Mindanao." (January 31, 2019)

 

Another factor which may have helped promote the activity off Northern California was antipodal concentration of seismic energy from the M 6.7 in the Prince Edward Islands of January 22. At the time this summary noted this possibility as:

 

"Seismicity off the coast of northern California to Washington may be enhanced by antipodal focusing of energy from the Prince Edward Islands. The active seismic area off the west coast of Oregon is abou 8 degrees east of the true antipode from the Prince Edward Islands region. While a major earthquake is not expected at this time off Oregon increases in magnitude beyond those previously expected could be +0.5-1.0 units." (January 23, 2019)

 

The last earthquake off the coast of Northern California within about 100 km

of these epicenters with M>4.5 was an M 4.7 on March 23, 2018. Forecast 113301 had expected today's activity was likely around February 7.

 

O: 04FEB2019 04:06:24  40.3N  124.4W Md=2.8  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 03FEB2019 07:37:41  40.3N  124.4W Ml=3.0  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 03FEB2019 22:18:13  40.3N  124.4W Mw=4.5  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 03FEB2019 23:13:22  40.3N  124.5W ML=3.4  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 04FEB2019 00:05:06  40.3N  124.5W ML=3.7  EMSC   OFFSHORE NORTHERN CALIFORNIA

O:  3FEB2019 23:43:22  40.3N  124.5W Mw=4.1  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P:  7FEB2019 113301    40.3N  124.7W 2.5-4.6 BAAAA  Off Coast of No. Calif     

 

A moderate M 4.3 occurred today in the region of Western Montana. NEIC reported intensity IV in Lincoln, Montana with II-III shaking at Helena, Wolf Creek, Calncy, East Helena, Missoula, and Great Falls among others. It was followed by a series of light aftershocks. The mainshock occurred within minutes of local solar noon and was probably triggered by tidal effects from the new moon alignment which was simultaneous with this earthquake and aftershocks. The M 4.3 is the largest event in western Montana since an M 4.3 on October 19, 2017. This activity is proably aftershocks of an M 5.8 that hit the area on July 6, 2017. Forecasts 113292, 113314 and 113037 had expected this activity in Montana  was likely around February 4. This epicenter is at 105 degrees from the M 7.1 in Mindanao, Philippines of December 29, 2018, a distance at which triggering is likely and may have been promoted by energy from that event.

 

O: 03FEB2019 17:19:00  46.8N  112.6W ML=3.3  EMSC   WESTERN MONTANA

O: 03FEB2019 17:48:34  46.8N  112.7W ML=2.6  EMSC   WESTERN MONTANA

O: 03FEB2019 17:45:58  46.8N  112.8W ML=2.8  EMSC   WESTERN MONTANA

O: 03FEB2019 17:17:01  46.9N  112.6W ML=2.4  EMSC   WESTERN MONTANA

O: 03FEB2019 20:01:52  46.9N  112.7W Ml=2.1  EMSC   WESTERN MONTANA

O: 03FEB2019 17:22:15  46.9N  112.7W Ml=2.3  EMSC   WESTERN MONTANA

O: 03FEB2019 20:32:46  46.9N  112.7W Ml=2.3  EMSC   WESTERN MONTANA

O:  3FEB2019 17:11:18  46.9N  112.7W Ml=4.3  EMSC   WESTERN MONTANA              

P:  4FEB2019 113292    45.7N  112.1W 2.0-4.1 ABAAA  Montana/Idaho              

P:  4FEB2019 113314    45.6N  111.9W 2.0-4.1 ABAAA  Yellowstone/Wyoming        

P: 29JAN2019 113037    44.5N  112.6W 2.0-4.1 BAAAA  Montana/Idaho              

 

A series of earthquakes in the Dominican Republic today may related to an M 4.5 in Western Australia of February 1. It is near the antipode of that event. Antipodal pairing has been seen before in these two regions. Stronger events in the region including Haiti, the Dominican Republic and Puerto Rico may follow in the next several days. Today's Dominican Republic activity was expected in forecast 113196 within about 25 km.

 

O:  1FEB2019 08:28:16  24.3S  113.1E mb=4.5  EMSC   WESTERN AUSTRALIA            

 

O:  3FEB2019 11:26:22  19.1N   68.2W ML=3.0  EMSC   DOMINICAN REPUBLIC REGION    

O:  3FEB2019 21:24:55  19.4N   68.2W Md=3.1  EMSC   DOMINICAN REPUBLIC REGION    

P:  3FEB2019 113196    20.0N   69.0W 3.0-4.6 AAAAA  Bahamas/No. Caribbean      

 

The strongest earthquake in the world today was an M 5.7 on the geomagnetic equator in Ceram, Indonesia. The current geomagnetic storm had been expected to activate this as as noted in previous issues of this summary as:

 

"This is the strongest geomagnetic storm in more than a month (especially at high latitudes) since AP reached 24 on December 28, 2018. Seismicity is expected to increase with a possible strong event near the geomagnetic equator and at high latitudes over the next five days as geomagnetic effects and the new moon promote fault slippage." (February 2-4, 2019)

 

This event is the strongest within about 200 km of this epicenter since an M 5.7 on March 8, 2018 and prior to that an M 6.9 on December 9, 2015. Forecast 113167 had expected this epicenter to be active within about 100 km  around February 4.

The tidal forecast had noted the possibility of enhanced seismicity in the Molucca area associated with the new moon.

 

O:  3FEB2019 12:43:20   3.1S  130.7E ML=3.8  EMSC   SERAM, INDONESIA             

O:  3FEB2019 07:36:45   3.3S  130.8E mb=5.7  EMSC   SERAM, INDONESIA             

P:  4FEB2019 113167     4.0S  131.0E 4.0-5.6 AAAAA  West Irian, PNG            

 

 

STRONG GLOBAL SEISMIC ACTIVATION ACCOMPANIES GEOMAGNETIC STORM

 

EARTHQUAKE SUMMARY FOR FEBRUARY 2, 2019

 

The strongest geomagnetic storm in more than a month has been occurring over the past two days. This was accompanied by a strong activation of global seismicity. This included a strong sequence of events along or near the geomagnetic equator in Indonesia included several events of M 6.1. Moderate seismicity along the geomagnetic equator occurred in Afghanistan, Chile, Peru.  At high latitudes moderate earthquakes occurred in the West Chile Rise (M 5.5); Jan Mayen Island (M 4.6, 4.1, 4.9) and the South Sandwich Islands (M 4.6), off the coast of Northern California (M 3.0-4.3) and Alaska in the Near Islands (M 5.1) among others. In previous issues of this summary this had been anticipated as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 17. High latitude geomagnetic field saw active to minor storm conditions  with AP at 24.

This is the strongest geomagnetic storm in more than a month (especially at high latitudes) since AP reached 24 on  December 28, 2018. Seismicity is expected to increase with a possible strong event near the geomagnetic equator and at high latitudes over the next five days as geomagnetic effects and the new moon promote fault slippage." (February 1-2, 2019)

 

The strongest earthquakes in the world today were a series of events of M 5.9-6.1 in the Mentawai region of Indonesia. The strongest of these of M 6.1 were felt with minor damage and intensity VII at Baturaja, Sumatra and IV in Padang, Sumatra. Lesser shaking was reported from Sungaipenuh Jambi, Solol. NEIC reported these earthquakes were felt with intensity II-III in Sungaipenuh Jambi, and in Sumatra at Padang and Solol, Indonesia. The last earthquake of M>=6.1 in the Mentawai region of Indonesia occurred as an M 6.5 on June 1, 2016. A major quake hit the are with M 7.8 on October 24, 2010. These events may be aftershock of that. Forecast 112943 expected this activity in late January or early February. This epicenter is near the geomagnetic equator and may have been promoted by the geomagnetic storm. This epicenter is at 102-103 degrees from the Anchorage, Alaska earthquake (M 7.1) of November 30, 2018 and from the South Sandwich Islands quake of December 11, 2018 (M 7.1) and may also have been promoted from those sources from concentrated seismic energy.

 

O: 02FEB2019 09:27:35   2.7S  100.2E Mw=6.1  EMSC   KEP. MENTAWAI REGION, INDONESIA

O: 02FEB2019 09:56:22   2.8S  100.0E ML=4.0  EMSC   EP. MENTAWAI REGION, INDONESIA

O: 02FEB2019 09:38:10   2.8S  100.0E ML=4.3  EMSC   EP. MENTAWAI REGION, INDONESIA

O: 02FEB2019 09:03:10   2.8S  100.1E Mw=5.4  EMSC   KEP. MENTAWAI REGION, INDONESIA

O: 02FEB2019 10:59:30   2.8S  100.2E Mw=6.1  EMSC   KEP. MENTAWAI REGION, INDONESIA

O: 02FEB2019 09:58:12   2.8S  100.2E mb=5.2  EMSC   KEP. MENTAWAI REGION, INDONESIA

O: 02FEB2019 11:01:38   2.8S  100.3E Mw=5.9  EMSC   KEP. MENTAWAI REGION, INDONESIA

O: 02FEB2019 09:45:12   2.9S  100.0E ML=4.0  EMSC   EP. MENTAWAI REGION, INDONESIA

O: 02FEB2019 10:09:22   2.9S  100.0E ML=4.1  EMSC   P. MENTAWAI REGION, INDONESIA

O: 02FEB2019 20:40:24   2.9S  100.0E mb=4.7  EMSC   KEP. MENTAWAI REGION, INDONESIA

O: 02FEB2019 14:59:57   2.9S  100.1E ML=3.9  EMSC   EP. MENTAWAI REGION, INDONESIA

O: 02FEB2019 13:10:20   2.9S  100.1E mb=5.1  EMSC   KEP. MENTAWAI REGION, INDONESIA

O: 02FEB2019 13:33:45   3.0S   99.9E mb=4.6  EMSC   EP. MENTAWAI REGION, INDONESIA

O: 02FEB2019 11:30:56   3.0S  100.0E ML=4.0  EMSC   EP. MENTAWAI REGION, INDONESIA

O: 02FEB2019 10:06:03   3.0S  100.0E ML=4.0  EMSC   P. MENTAWAI REGION, INDONESIA

O: 02FEB2019 09:39:16   3.0S  100.0E ML=4.7  EMSC   UTHWEST OF SUMATRA, INDONESIA

O: 02FEB2019 10:11:07   3.0S  100.0E mb=4.8  EMSC   KEP. MENTAWAI REGION, INDONESIA

O: 02FEB2019 11:09:38   3.2S  100.0E ML=4.8  EMSC   EP. MENTAWAI REGION, INDONESIA

O:  2FEB2019 09:27:35   2.7S  100.2E Mw=6.1  EMSC   KEP. MENTAWAI REGION, INDONESI

P:  6FEB2019 113161     4.0S  102.0E 4.0-5.6 BBBAA  So. of Sumatera            

P: 25JAN2019 112943     2.0S  100.0E 4.0-5.6 CAAAA  So. of Sumatera            

 

A moderately strong earthquake of M 5.7 occurred under Hindu Kush in Afghanistan today.  NEIC reported it was felt with intensity II-III in Afghanistan at Qunduz, Mahmoud Raqui, Baghrami, Kabul, in Dushanbe, Tajikistan; and in Pakistan at Peshawar, Haripur, Wah and Islamabad. This is the strongest earthquake in Hindu Kush, Afghanistan within about 150 km of this epicenter since an M 6.2 on May 9, 2018 and prior to that n M 6.1 on January 31, 2018, one year ago. Forecast 113230 had expected this event within this area was likely around February 4.

 

O:  2FEB2019 08:48:44  36.5N   71.1E mb=4.1  EMSC   HINDU KUSH REGION, AFGHANISTAN

O:  2FEB2019 12:04:36  36.6N   70.8E Mw=5.7  EMSC   HINDU KUSH REGION, AFGHANISTAN

P:  4FEB2019 113230    36.0N   70.0E 3.8-5.4 AAAAA  Hindu Kush/Pakistan        

 

Seismicity at high latitudes included an M 5.5 in the West Chile Rise, possibly related to the strong activation of western South America over the past week. There is no populated area near this epicenter and the quake was not felt.  Forecast 113122 had expected this event was likely at the end of January within  about 50 km of this epicenter. The last earthquake within about 250 km of this  epicenter with M>=5.5 was an M 5.7 on December 25, 2015 and prior to that an M 5.6 on October 26, 2010. The  largest quake in this region in the past 30 years was the December, 2015 quake.

 

O:  2FEB2019 17:55:39  41.3S   88.2W Mw=5.5  EMSC   WEST CHILE RISE               

P: 21JAN2019 113122    41.0S   88.0W 4.0-5.8 CAAAA  Chile Rise                 

 

The largest earthquake in the U.S. or Canada today was an M 5.1 in the Near Islands, Aleutians. It was not reported felt in this remote area. This is the strongest earthquake in the Near Islands within about 200 km of this epicenter since an M 6.6 in the Rat Islands on October 8, 2017. Forecast 113327 expected today's event was likely around February 3. The October, 2017 also followed a strong geomagnetic storm.

 

O:  3FEB2019 04:45:57  52.1N  174.2E mb=5.1  EMSC   NEAR ISLANDS, ALEUTIAN ISLANDS

O: 03FEB2019 04:45:58  52.1N  174.1E mb=5.1  ANSS   Shemya Island Alaska

P:  3FEB2019 113327    51.0N  177.0E 4.0-5.8 ABBAA  Rat Islands                

 

The strongest earthquake in the U.S. or Canada today ouside Alaska was an M 4.3 off the coast of Northern California. NEIC reported it was felt with intensity II-III in California at Ferndale, Fortuna, Hydesville, Loleta, Carlotta, Eureka, Bayside, Arcata and Bridgeville among others. NEIC reported aftershocks of M 3.6 and M 3.0 Off the Coast of Northern California  were felt with intensity II-III in the area(s) of Fortuna, California. An earlier M 3.2 in the area was felt with intensity II in Rio Dell, California. The nature of this swarm suggests it may extend for another day, possibly with a larger event included. The last earthquake within about 50 km of this epicenter with M>=4.3 occurred July 25, 2018 with M 4.5. Forecast 113301 expected today's activity was likely in early February within  about 25 km of this epicenter. This series may have been promoted by the new moon tidal alignment which will be complete tomorrow as it began near local solar midnight, a time when earth tidal stresses are maximized. In previous issues this summary had expected enhanced seismicity at this longitude in the tidal forecast as:

 

"The new moon will arrive on February 4, 2019 at 21:04 UT. Longitudes which

are sub-lunar at this time are near 45 East and those which are sub-solar at near 135 West longitude. These are the zones which will experience maximum tidal stresses at this time. In the west they include western North America and eastern Alaska and in the east, the Middle East and eastern Africa. While tidal forces can help promote seismicity in many areas beyond these zones, moderate to large earthquakes are most likely in these zones. A large to major earthquake is likely in the next seven days. Strong earthquakes which occurred at the time of the previous new moon on January 6 included an M 5.8 in the Andreanof Islands  Alaska; an M 6.8 deep beneath Brazil; an M 6.6 in the Molucca area of Indonesia and M 6.3 in Kyushu, Japan. These areas may see additional moderate to strong seismicity at this time." (February 1-2, 2019)

 

These epicenters area at 100-101 degrees from the M 7.0 in Mindanao, Philippines of December 29, 2018 and were probably enhanced by energy from tht source. This summary had expected regional enhancement in Central and Northern California from this event at this time in previous issues.

 

O: 02FEB2019 16:00:16  40.2N  124.8W ML=3.0  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 03FEB2019 00:36:51  40.3N  124.4W ML=3.5  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 03FEB2019 01:38:24  40.3N  124.4W ML=3.6  EMSC   OFFSHORE NORTHERN CALIFORNIA

O: 02FEB2019 11:18:26  40.3N  124.4W Ml=3.2  EMSC   OFFSHORE NORTHERN CALIFORNIA

O:  2FEB2019 10:52:23  40.3N  124.4W mb=4.3  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P:  7FEB2019 113301    40.3N  124.7W 2.5-4.6 BAAAA  Off Coast of No. Calif     

 

The most unusual earthquake in the U.S. or Canada today was an M 3.5 in the San Clemente Island area of Southern California. NEIC reported it was felt with intensity II-III in Avalon, La Jolla, San Diego and possibly as far as 125 km from the epicenter. The last event of M>=3.5 in the Gulf of Santa Catalina within about 50 km of today's epicenter occurred on June 20, 2018 (M 3.5) and May 1, 2018 (M 3.7). Forecast 113252 had expected this event within about 5 km was likely around February 4. This may be a precursor to a larger regional event in the next week.

 

O:  2FEB2019 20:19:18  32.8N  118.3W ML=3.5  EMSC   GULF OF SANTA CATALINA, CALIF.

O: 02FEB2019 20:19:18  32.8N  118.3W ml=3.5  ANSS   Is. (SE tip) CA

P:  4FEB2019 113252    32.8N  118.3W 2.5-4.6 AAAAA  So. California             

 

STRONG M 6.6 SHAKES EASTERN MEXICO AND GUATEMALA

 

EARTHQUAKE SUMMARY FOR FEBRUARY 1, 2019

 

An earthquake of M 6.6 shook areas of Chiapas and Oaxaca, Mexico and areas of western Guatemala today. This event was reported with slight damage and intensity VI in Chiapas, Mexico at Tapachula and in San Marcos, Guatemala. Intensity V was reported from Guatemala at Quetzaltenango, Panajachel,  and Mazatenango with IV in Cajola, Almolonga, San Pablo la Laguna and San Marcos La Laguna, Guatemala. It was also reported with IV in Chiapas at Comitan and Tuxtla Gutierrez. Lesser Shaking occurred within about 1000 km of the epicenter in the States of Mexico, Morelos, Puebla, Veracruz, and in Honduras, El Salvador, Honduras and Belize. No deaths were reported with this earthquake but damage occurred at Suciate, Chiapas. Buildings in Mexico City, 500 km to the west swayed during the earthquake and some buildings were evacuated. Landslides and mudslides occurred in the epicentral area. While no major injuries were reported, some damage was also  felt in Quetzaltenango, Guatemala where some minor damage was reported. This event occurred at the maximum point of a geomagnetic storm, the strongest in more than a month near local solar noon. This summary described this storm as:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 27. High latitude geomagnetic field saw active to minor storm conditions  with AP at 40.  This is the strongest geomagnetic storm in more than a month since AP reached 24 on  December 28, 2018. Seismicity is expected to increase with a possible strong event near the geomagnetic equator and at high latitudes over the next five days as geomagnetic effect and the new moon promote fault slippage. The earthquake in Mexico today occurred as today's geomagnetic storm reached its maximum intensity at high latitudes and was likely promoted by effects from this storm." (February 1, 2019)

 

In the previous issue of this summary it was anticipated that the area could be active at this time as:

 

 

"A region at 90 degrees (node 4) from Fiji is eastern Mexico which has been active in the same time period of late January as the Fiji Islands. It may be promoted from that source. The unusual activity in the Mexican State of Ozxaca which has been occurring over the past three days temporarily ceased today. The area has shown activation with the west coast of South America and Central America since the full moon. The largest event in the area today was M 4.3. Quiet periods of seismicity in this area of Mexico have been proposed as possible precursors to large regional events. In previous issues this summary noted these unusual prior events in part as:

 

"A moderate earthquake of M 5.4 continued the elevated seismicity in eastern Mexico today.  NEIC reported this event in Veracruz was felt with intensity II-III in Oaxaca at Oaxaca, Santa Lucia, Maczoquitlan, Veracruz, Villahermosa, Tabasco and in Mexico City. When a smaller event of M 5.0 hit about 50 km west of this yesterday this summary noted:

 

"An unusually large M 5.0 also occurred in the Oaxaca, Mexico area today. NEIC reported this earthquake of M 5.0 in Oaxaca, Mexico was felt with intensity IV in Huatulco, Oaxaca, Mexico and II-III in the area(s) of Mexico at Xadani, Oaxaca and Mexico City. This is the first event of M>=5 within about 100 km of this epicenter since an M 5.4-5.5 on October 14, 2017. Most of the recent activity in the area including an M 5.8 on January 21, 2019 has been occurring about 100-150 km south of this off the  Oaxaca coast and has not been widely felt. Forecast 112953 expected today's event was likely within about 100 km around January 27. This epicenter is at 102 degrees from the Loyalty Islands and may have been promoted by concentrated seismic energy from that source." (January 28-31, 2019)

 

The last earthquake in the region of Chiapas within about 250 km of today's epicenter with M>=6.6 was the major quake of September 8, 2017 (M 8.1) about 200 km to the west of today's epicenter. That quake killed more than 400. Like today's earthquake that event also appears to have been triggered by a major solar flare and geomagnetic storm. This summary noted this at the time as:

 

"The geomagnetic field was at severe storm conditions today.  The AP level was 38. High latitude geomagnetic field saw severe storm conditions with AP at 60.  Triggering of strong seismicity from the severe geomagnetic storms  today and tomorrow is likely and includes the M 8.0-8.4 quake in eastern Mexico today.  A flare of X1.3 occurred near UT noon today, This follows two similar quakes yesterday including an X9.3 the first X-class solar flare since an X2.1 on March 11, 2015 and the strongest flare in at least 11 year, the solar cycle period. Strong seismicity is likely to be promoted 10-15 degrees from the geomagnetic equator and at high auroral latitudes around September 10-13. This is most likely in areas near 90 East and West longitudes including Indonesia and Central America among others. This is a combined effect of weather, geomagnetic and tidal effects associated with the full moon. The earthquake today in eastern Mexico appears to confirm this analyses. The planetary K-index reached maximum of 8 today, around 0400 UT on September 8. This is the first time it has reach 8 since  March 17, 2015, two and a half years ago. The simultaneity of this geomagnetic storm and the M8+ at the same time in Chiapas, Mexico is powerful coincidental evidence for a triggering relation as previously noted in this summary on many occasions." (September 8, 2017)

 

Forecasts 113171 amd 113175 had expected today's event within about 25 km  of the epicenter was likely around February 1.

 

O:  1FEB2019 16:59:28  14.5N   92.6W ML=4.5  EMSC   OFFSHORE CHIAPAS, MEXICO     

O:  1FEB2019 18:44:41  14.5N   92.7W ML=4.3  EMSC   OFFSHORE CHIAPAS, MEXICO     

O:  2FEB2019 06:16:39  14.7N   92.4W ML=4.2  EMSC   CHIAPAS, MEXICO              

O:  1FEB2019 18:01:57  14.8N   92.4W ML=4.2  EMSC   CHIAPAS, MEXICO              

O:  1FEB2019 22:42:50  14.8N   92.5W ML=4.3  EMSC   OFFSHORE CHIAPAS, MEXICO      

O:  1FEB2019 16:14:12  14.9N   92.2W Mw=6.6  EMSC   CHIAPAS, MEXICO              

P:  1FEB2019 113171    14.0N   93.0W 3.5-5.5 AAAAA  Chiapas, Mexico            

P:  5FEB2019 113175    15.0N   92.0W 3.5-5.6 BAAAA  Guatemala                  

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in the Alaska Peninsula. The last earthquake in the Alaska Peninsula with M>=4.7 within about 150 km of this epicenter occurred on January 22, 2019 with M 5.2 and prior to that on May 11, 2018 with M 5.1-5.2.  Forecast 113315 had expected today's event was likely to the south in the Alaska Peninsula around February 2.

 

O:  1FEB2019 15:09:38  57.0N  157.8W mb=4.7  EMSC   ALASKA PENINSULA             

P:  2FEB2019 113315    54.7N  156.9W 3.5-5.1 ACAAA  Alaska Peninsula           

 

An unusual pair of events occurred near Glenwood Springs, Colorado with M 3.1 and 2.0. NEIC reported this earthquake of M 3.1 in Colorado was felt with intensity II-III in the area(s) of Glenwood Springs, New Castle, Carbondale, Aspen, Salida, Fort Collins and Colorado Springs.  The last event within about 100 km of this epicenter in Colorado with M>=3.1 occurred as a series (M 3.4, 3.6 and 3.2) on December 11, 2018.  Forecast 113228 had expected today's earthquake within about 10 km was likely at the beginning of February.

 

O:  1FEB2019 08:59:49  39.6N  107.3W ML=2.0  EMSC   COLORADO                     

O:  1FEB2019 08:58:32  39.6N  107.4W ML=3.1  EMSC   COLORADO                     

P:  7FEB2019 113228    39.6N  107.4W 2.0-3.9 CAAAA  Colorado area              

 

PAIRED ACTIVITY CONTINUES IN FIJI AND MEXICO

 

EARTHQUAKE SUMMARY FOR JANUARY 31, 2019

 

The strongest earthquake in the world today was an M 5.5 in the area south of the Fiji Islands. This region has been active over the past week with regional events of M 6.2 on January 26 and M 5.8 on January 27, the strongest deep focus  activity in the region within about 150 km of today's epicenter since an M 5.5 on July 12, 2018. Forecast 113113 had expected today's event in this area  was likely around January 31.

 

O: 31JAN2019 14:33:57  24.4S  179.8W Mw=5.5  EMSC   SOUTH OF FIJI ISLANDS        

P: 31JAN2019 113113    23.0S  180.0W 4.0-5.7 ABAAA  Tonga Islands              

 

A region at 90 degrees (node 4) from Fiji is eastern Mexico which has been active in the same time period of late January as the Fiji Islands. It may be promoted from that source. The unusual activity in the Mexican State of Oaxaca which has been occurring over the past three days temporarily ceased today. The area has shown activation with the west coast of South America and Central America since the full moon. The largest event in the area today was M 4.3. Quiet periods of seismicity in this area of Mexico have been proposed as possible precursors to large regional events. In previous issues this summary noted these unusual prior events in part as:

 

"A moderate earthquake of M 5.4 continued the elevated seismicity in eastern Mexico today. NEIC reported this event in Veracruz was felt with intensity II-III in Oaxaca at Oaxaca, Santa Lucia, Maczoquitlan, Veracruz, Villahermosa, Tabasco and in Mexico City. When a smaller event of M 5.0 hit about 50 km west of this yesterday this summary noted:

 

"An unusually large M 5.0 also occurred in the Oaxaca, Mexico area today. NEIC reported this earthquake of M 5.0 in Oaxaca, Mexico was felt with intensity IV in Huatulco, Oaxaca, Mexico and II-III in the area(s) of Mexico at Xadani, Oaxaca and Mexico City. This is the first event of M>=5 within about 100 km of this epicenter since an M 5.4-5.5 on October 14, 2017. Most of the recent activity in the area including an M 5.8 on January 21, 2019 has been occurring about 100-150 km south of this off the  Oaxaca coast and has not been widely felt. Forecast 112953 expected today's event was likely within about 100 km around January 27. This epicenter is at 102 degrees from the Loyalty Islands and may have been promoted by concentrated seismic energy from that source." (January 28-29, 2019)

 

Forecasts 112952 and 113171 had expected this event within about 100 km of the epicenter was likely in late January to early February.

 

This activity in eastern Mexico was probably promoted by the strong earthquakes in  the Loyalty Islands over the past two months including an M 7.6. This swarm is located at 101-102 degrees from Mexico - a distance at which seismic energy is concentrated at the surface and can help trigger additional seismicity -  and this may be the case here as noted in previous issues of this report. A resurgence of a storm in the geomagnetic field today may exacerbate regional activity in Central and South America.

 

O: 31JAN2019 17:20:54  15.5N   94.7W mb=4.3  EMSC   OFFSHORE OAXACA, MEXICO      

P:  1FEB2019 113171    14.0N   94.0W 3.5-5.3 ABAAA  Chiapas, Mexico            

P: 28JAN2019 112952    15.0N   94.0W 3.5-5.4 BAAAA  Chiapas, Mexico            

 

The strongest earthquake in the western hemisphere today, however was an M 5.1 in Costa Rica.  NEIC reported this earthquake of M 4.9 in Costa Rica was felt with intensity II-III in the area(s) of Puerto Cortes Puntarenas, Palmares, San Isidro, Buenos Aires, Quepos, La Suiza, Cartago, Santiago, San Jose, Angeles, Heredia, Cahuita, Limon Costa Rica and Almirante, Panama.  The last quake in Costa Rica within about 200 km of this epicenter with M>=5. occurred a year ago on February 11, 2018 with M 5.3. These may be aftershocks of an M 6.5 event in Costa Rica of November 13, 2017. Forecast 113136 expected today's quake within about 25 km of the epicenter was likely in early February.

 

O: 31JAN2019 13:09:54   9.1N   83.8W Mw=5.1  EMSC   COSTA RICA                   

P:  8FEB2019 113136     9.0N   84.0W 3.5-5.3 CAAAA  Costa Rica                 

 

The strongest earthquake in the U.S. or Canada today was an M 4.3 in the Gulf of Alaska aftershock zone. It was not reported felt. Aftershocks of this great earthquake of January 23, 2018 (M 7.9) have been frequent and occasionally of moderate magnitudes, so today's event is not uncommon at this time. The last event of M>=4.3 in this aftershock sequence was an M 4.4 on July 21, 2018.

Forecast 113080 had expected today's event was likely at the end of January.

 

O: 31JAN2019 13:03:49  56.3N  149.3W mb=4.3  EMSC   GULF OF ALASKA               

P: 25JAN2019 113080    55.4N  150.5W 3.2-5.0 CAAAA  Gulf of Alaska             

 

 

MODERATELY STRONG QUAKES CONTINUE NEAR SOUTH AMERICA; CALIFORNIA ACTIVE

 

EARTHQUAKE SUMMARY FOR JANUARY 30, 2019

 

Moderately strong earthquakes occurred today in the East Pacific Rise (M 5.9) and in Central Chile (M 5.6). Seismicity in California also suggested increased activation in this region in the next week to 10 days. This continued the activation of the region which has been followed by this summary for the past week. This may have been promoted by tidal stresses associated with the past full moon and eclipse and by the  recent geomagnetic storm, which may continue today and tomorrow as a resurgence.

 

The strongest of today's events was an M 5.9 in the Central East Pacific Rise off western Ecuador and south of the Galapagos Islands. This is a remote area and this event was not reported felt. This is the strongest earthquake within  about 300 km of this epicenter in the East Pacific Rise in more than five years – since an M 6.1 about 100 km to the east on September 11, 2013. Forecast 112938 had anticipated the possibility of this event at the end of January about 150 km to the east of today's epicenter.

 

O: 30JAN2019 15:31:33   4.6S  105.5W Mw=5.9  EMSC   CENTRAL EAST PACIFIC RISE    

P: 21JAN2019 112938     4.0S  104.0W 4.0-5.5 CABAA  No. East Pacific Rise      

 

The strongest earthquake to be felt in the world today was an M 5.6 in Central Chile. NEIC reported it was felt with intensity V in Copiapo, Atacama, Chile; IV in Antofagasta and II-III in Taltal and Diego de Almagro, Chile. CSN reported this earthquake was felt with intensity  VI in  Atacama at Copiapo, Tierra Amarilla; V in Caldera, Chanaral, Diego de Almagro, IV in Vallenar and III in Alto del Carmen and in Antofagasta with V in Taltal and III in Antofagasta, Chile. This is the strongest earthquake within about 150 km of this epicenter since an M 6.1 1.5 years ago on July 25, 2016 and prior to that an M 6.2 on November 27, 2015. Forecasts 113372 and 113104 had expected this event was likely within about 50 km at the end of January or in early February.

 

O: 30JAN2019 07:44:43  25.9S   70.6W Mw=5.6  EMSC   ANTOFAGASTA, CHILE           

O: 30JAN2019 07:44     25.9S   70.6W mb=5.5  GUC    Atacama at Copiapo, Tierra Ama

P:  3FEB2019 113372    26.0S   71.0W 4.0-5.8 BAAAA  Coast Central Chile         

P: 24JAN2019 113104    26.0S   71.0W 4.0-5.9 CAAAA  Coast Central Chile        

 

The largest earthquake in the U.S. or Canada today was an M 4.7 in the western Andreanof Islands, Aleutians. It was not reported felt in this remote area. The last event within about 200 km of this epicenter in the Andreanof Islands with M>=4.7 occurred on May 3, 2018 with M 4.8. The last of M>=5 was an M 5.1 on February 16, 2018. Forecast 113058 had expected this event within about 30 km of the epicenter was likely at the end of January.

 

O: 31JAN2019 00:22:04  51.4N  178.3W mb=4.7  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 22JAN2019 113058    51.7N  178.3W 3.5-5.1 CAAAA  Andreanoff Isls, Aleutians 

 

The area of California saw increasing seismicity today after several days of relative quiet. Light earthquakes occurred near Los Angeles and San Francisco with M 2.8. The M 2.8 in the San Francisco Bay area was followed by an M 2.2. These epicenters are located off the coast of San Francisco. Light to moderate earthquake in this area occasionally are followed by stronger events in the land area near San Francisco. One of the more interesting of these occurred on April 11, 1906 and followed a major earthquake in the Gulf of California of M 7.5 on April 10, 1906. These preceded the great M 8.3 quake in San Francisco on April 18, 1906. Further activity with a possible moderate event is likely in this area in  the next week to ten days. A major solar or geomagnetic storm or the full moon of February 4, 2019. This tidal event is strongest in the area of California maximizing at 21:04 UT - near local solar noon and could trigger enhanced activity in California at that time. A further promoter of seismicity  in this area at this time is the M 7.1 in Mindanao, Philippines of December 29, 2018. This epicenter is located at 103 degrees from Central California, a distance at which triggering is likely from concentrated energy from Mindanao.

 

NEIC reported the earthquake of M 2.8 in Central California was felt with intensity II-III in the area(s) of Daly City, San Francisco, South San Francisco, San Francisco, Brisbane, Pacifica and San Bruno, California.

 

O: 31JAN2019 00:11:27  37.7N  122.5W Md=2.2  EMSC   OFFSHORE NORTHERN CALIFORNIA 

O: 30JAN2019 18:28:53  37.7N  122.5W Md=2.8  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 28JAN2019 112987    37.1N  121.5W 2.5-4.5 AAAAA  Central California         

 

An M 2.8 in Southern California also occurred today.  NEIC reported this earthquake of M 2.8 in Southern California was felt with intensity II-III in the area(s) of Northridge, North Hills, Van Nuys, Encino, Reseda, Porter Ranch, and Winnetka, California among others. The M 2.8 was accompanied by a series of light earthquakes in the valleys west and south of Los Angeles. Seismicity in the Los Angeles area often increases in January and February. This includes the Northridge quake of  January 16, 1994 (M 6.7) and the San Fernando earthquake of February 9, 1971 (M 6.7). The time for stress to build up in the area may be about 23-25 years, consistent with the possibility of another such event on the horizon. This summary has noted this relation in the past. The Northridge event was preceded by a series of light earthquake south and west of Los Angeles not unlike the series which is now occurring. These may precede a moderate earthquake in the area.

 

The earthquake in eastern Los Angeles occurred with M 3.2 is the first at this magnitude level since an M 3.6 about 50 km northeast of today's epicenter yesterday on January 30, 2019, the first such activity in this area since July 10, 2018 when a similar M 3.6 hit. Forecast 113257 expected this event was likely around February 1 within about 30 km of this epicenter.

 

NEIC reported this earthquake of M 3.2 in Southern California was felt with intensity II-III in the area(s) of Loma Linda, Colton, Redlands, San Bernardino, Moreno, Grand Terrace, Highland, California among others within about 100 km of the epicenter.

 

O: 30JAN2019 08:00:48  34.0N  117.2W Ml=3.2  EMSC   GREATER LOS ANGELES AREA, CALI

P:  1FEB2019 113257    33.9N  116.9W 2.5-4.5 AAAAA  So. California             

 

An M 3.2 also occurred north of Los Angeles today.  NEIC reported this earthquake of M 3.2 in Southern California was felt with intensity II-III in the area(s) of Mojave and Palmdale, California.  This is the strongest earthquake within about 50 km of this epicenter since an M 3.5 1.5 years ago on July 28m 2017 but the last nearer today's epicenter was an M 3.6 on June 4, 2017. Forecast 113261 had expected seismic activity in this region was likely around February 4.

 

O: 31JAN2019 03:13:36  35.4N  117.9W ML=3.2  EMSC   SOUTHERN CALIFORNIA          

O: 31JAN2019 06:43:28  35.4N  117.9W Ml=2.1  EMSC   SOUTHERN CALIFORNIA          

P:  4FEB2019 113261    35.0N  117.7W 2.5-4.5 BAAAA  So. California             

 

O: 30JAN2019 11:45:01  33.9N  118.4W Ml=2.1  EMSC   SANTA MONICA BAY, CALIFORNIA 

P:  3FEB2019 113258    34.0N  118.7W 2.5-4.6 BAAAA  So. California             

P: 30JAN2019 113011    34.3N  118.5W 2.5-4.5 AAAAA  So. California             

 

O: 30JAN2019 17:46:08  34.2N  118.5W Ml=2.8  EMSC   GREATER LOS ANGELES AREA, CALI

P: 30JAN2019 113011    34.3N  118.5W 2.5-4.5 AAAAA  So. California             

 

MODERATELY LARGE QUAKES CONTINUE IN SOUTH AMERICA AND TAIWAN

 

EARTHQUAKE SUMMARY FOR JANUARY 29, 2019

 

The enhanced seismicity from Veracruz, Mexico through the coast of South America continued for the second day today. Earthquakes of M 5.4 occurred in Oaxaca, Mexico; These were accompanied by an M 5.3-5.7 off the east coast of Taiwan, an event which was widely felt in Taiwan.

 

The earthquake off eastern Taiwan was not reported to have done any damage

in Taiwan.  CWB reported this earthquake was felt with intensity IV in Taitung; III in Hualien, Yilan, Hsinchu, Yunlin, Changhua; II in Nantou, Taichung, Taipei, Chiayi, Hsinchu, Taoyuan, Miaoli, Kaohsiung and Pingtung and I in Tainan and Penghu Counties, Taiwan. NEIC reported this earthquake of M 5.3 in Taiwan was felt with intensity II-III in the area(s) of Taipei, Taiwan at Yungho and Tanshui. No tsunami was expected nor observed. The last event within about 150 km of this epicenter in Taiwan with M>=5.7 was an M 5.7 on February 7,, 2018 which followed mainshocks of M 6.4 on February 6 and M 6.1 on February 4, 2018. Forecast 113208 had expected today's event was likely about 150 km northwest of this epicenter at the end of January or early February.

 

O: 30JAN2019 05:21:32  23.7N  122.5E Mw=5.3  EMSC   TAIWAN REGION                

O: 30JAN2019 05:21:35  23.7N  122.4E ML=5.7  TAI    Hualien, Taiwan              

P:  1FEB2019 113208    25.0N  122.0E 4.0-5.6 ABAAA  Ryukyu Islands             

 

A moderate earthquake of M 5.4 continued the elevated seismicity in eastern Mexico today. NEIC reported this event in Veracruz was felt with intensity II-III in Oaxaca at Oaxaca, Santa Lucia, Maczoquitlan, Veracruz, Villahermosa, Tabasco and in Mexico City. When a smaller event of M 5.0 hit about 50 km west of this yesterday this summary noted:

 

"An unusually large M 5.0 also occurred in the Oaxaca, Mexico area today. NEIC reported this earthquake of M 5.0 in Oaxaca, Mexico was felt with intensity IV in Huatulco, Oaxaca, Mexico and II-III in the area(s) of Mexico at Xadani, Oaxaca and Mexico City. This is the first event of M>=5 within about 100 km of this epicenter since an M 5.4-5.5 on October 14, 2017. Most of the recent activity in the area including an M 5.8 on January 21, 2019 has been occurring about 100-150 km south of this off the Oaxaca coast and has not been widely felt. Forecast 112953 expected today's event was likely within about 100 km around January 27. This epicenter is at 102 degrees from the Loyalty Islands and may have been promoted by concentrated seismic energy from that source." (January 28-29, 2019)

 

Today's event is the strongest within about 150 km of this epicenter since an M 6.1 on September 23, 2017. Subsequent activity has stayed consistently southwest  of today's epicenter by about 150 km. Forecast 112953 had expected today's  event within about 50 km was likely around January 27.

 

O: 30JAN2019 01:46:12  17.5N   93.9W Mw=5.4  EMSC   VERACRUZ, MEXICO             

P: 27JAN2019 112953    17.0N   94.0W 3.5-5.3 BAAAA  Chiapas, Mexico            

 

An M 5.5 also occurred in Central Peru today. NEIC reported it was felt with intensity II-III in Peru at Arequipe, Cusco and Iquique, Tarapaca, Chile. When a similar M 5.5-5.7 hit north of this in Peru on January 25, 2019, this summary noted:

 

"The M 5.7 in southern Peru is the strongest within about 200 km of this epicenter since an M 7.1 about 150 km to the south that occurred a year ago on January 14. 2018. Forecast 113090 had expected this event was likely around January 25. The event of M 5.1 to the north occurred in the vicinity of forecast 112939." (January 25, 2019).

 

Today's event is the strongest within about 200 km of the epicenter since an M 7.1 on January 14, 2018. Most of the subsequent activity has been at shallow depths about 200 km to the west of the current epicenter with M 5.3-5.5. Forecast 113097 had expected today's activity was likely within about 50 km around January 28. 

 

O: 29JAN2019 23:34:59  15.5S   72.4W Mw=5.5  EMSC   SOUTHERN PERU                

P: 28JAN2019 113097    16.0S   72.0W 4.0-5.8 AAAAA  So. Peru/Bolivia           

 

The most unusual earthquake today was an M 4.8 in the region of Poland.  NEIC reported this earthquake of M 4.1 in Poland was felt with intensity II-III in the area(s) of Doinoslaskie, Poland at Polkowice and Lubin. Seismicity in this area is often associated with mining and rockbursts but events of M>=4.8 are not common. The last such event in the region within about 150 km of today's epicenter occurred on July 20, 2018 with M 5.0 and prior to that on December 30, 2010 also with M 5.0. Forecast 113067 had expected a possibly moderate event in this region was likely within about 50 km of this epicenter around January 28.

 

O: 29JAN2019 12:53:45  51.6N   16.1E mb=4.8  EMSC   POLAND                       

P: 28JAN2019 113067    51.0N   16.0E 3.0-4.6 AAAAA  Poland                     

 

The strongest earthquakes in the U.S. or Canada today were of M 3.6 and occurred in the Landers region of Southern California and off the coast of northern  California.

 

The earthquake east of Los Angeles was widely felt. NEIC reported this earthquake of M 3.6 in Southern California was felt with intensity IV in Lucerne Valley, California and II-III in the area(s) of Big Bear City, Big Bear Lake, Apple Valley, Angelus Oaks, Skyforest, Landers, Cedar Glen and Lake Arrowhead among others. The last event within about 50 km of this epicenter with M>=3.6 occurred on July 10, 2018 and on July 7, 2018 both with M 3.6. The last of larger magnitude was an M 4.5 on May 8, 2018. Forecasts 113012 and 113257 had expected this activity at the end of January or early February.

 

O: 30JAN2019 02:40:12  34.4N  116.9W ML=3.6  EMSC   SOUTHERN CALIFORNIA          

P:  1FEB2019 113257    33.9N  116.9W 2.5-4.5 AAAAA  So. California             

P: 30JAN2019 113012    34.3N  116.5W 2.5-4.5 AAAAA  So. California             

 

The M 3.6 off the coast of northern California is the strongest within about 50 km of that epicenter since July 25, 2018 when an M 4.5 occurred about 50 km to the east of today's epicenter. Forecast 113045 had expected today's event was likely within about 30 km of the epicenter around January 31.

 

O: 30JAN2019 00:34:50  40.4N  125.5W ML=3.6  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P: 31JAN2019 113045    40.5N  125.8W 2.5-4.6 AAAAA  Off Coast of No. Calif     

 

MODERATE SEISMICITY CONTINUES IN SOUTH AMERICA

 

EARTHQUAKE SUMMARY FOR JANUARY 28, 2019

 

Moderately strong seismicity continued along the west coast of South America today. Moderate quakes of M 5.4 and M 5.3 occurred in Colombia and Maule, Central Chile respectively. These may have been promoted by the geomagnetic storm, now concluded but tidal triggering of these events is unlikely. An M 5.0 east  of Tokyo, Japan was more likely enhanced by tidal effects. These were joined by an unusual M 5.0 in Oaxaca, Mexico.

 

The M 5.4-5.5 in Colombia is the second mainshock of a series which began January 26, 2019, with an M 5.6. This is the strongest activity within about 200 km of this epicenter since an M 5.5 on February 6, 2017.  NEIC reported today's earthquake of M 5.5 in Colombia was felt with intensity IV in Colombia at Planadas, Palmira Valle del Cauca, Cali, Popauyan, Ibague, and V in Pereira and II-III in the area(s) of Jamundi, Restrepo, Armenia and Cartago, Colombia.

Forecast 112918 had expected this activity in Colombia was possible towards the end of January. These epicenters are located at 103 degrees from the M 7.3 in the Komansorsky Islands of December 20, 2018 and from the Fiji Islands earthquakes and was probably promoted from those sources.

 

O: 28JAN2019 21:28:00   3.0N   75.9W ML=4.0  EMSC   COLOMBIA

O: 29JAN2019 06:10:00   3.0N   76.0W ML=4.0  EMSC   COLOMBIA

O: 28JAN2019 21:07:14   3.1N   75.8W Mw=5.4  EMSC   COLOMBIA

O: 28JAN2019 21:07:14   3.1N   75.8W Mw=5.5  ANSS   COLOMBIA

O: 28JAN2019 22:02:00   3.1N   75.9W ML=4.0  EMSC   COLOMBIA

O: 28JAN2019 22:33:00   3.1N   75.9W ML=4.1  EMSC   COLOMBIA                     

P: 24JAN2019 112918     5.0N   76.0W 4.0-5.6 BBAAA  Colombia                   

 

The earthquake of M 5.3 off the coast of Maule, Chile was the strongest within about 100 km of that epicenter since an M 5.6 pm July 12, 2017, an aftershock of an M 5.9 of July 4, 2017.  CSN reported today's earthquake was felt with intensity V in Maule at Cauquenes, Constitucion, Pelluhue and III in Talca; in Biobio with III in Concepcion, Hualpen, Lota, San Pedro de la Paz and Talcahuano, Chile. NEIC reported this earthquake of M 5.3 in Central Chile was felt with intensity IV in Concepcion, Biobio, Chile and II-III in the area(s) of Cauquenes, Maule, Chillan, Linares, and Valparaiso, Chile. Forecast 113116 had expected this event within about 50 km around January 27. It was probably promoted by regional moderate to large earthquakes in the  Coquimbo region of Chile about 600 km to the north of today's event.

 

O: 28JAN2019 09:00:45  35.6S   72.9W mb=5.3  EMSC   OFFSHORE MAULE, CHILE        

O: 28JAN2019 09:00     35.6S   73.0W mb=5.0  GUC    Maule at Cauquenes, Constituci

P: 27JAN2019 113116    36.0S   73.0W 4.0-5.6 AAAAA  Central Chile              

 

An unusually large M 5.0 also occurred in the Oaxaca, Mexico area today. NEIC reported this earthquake of M 5.0 in Oaxaca, Mexico was felt with intensity IV in Huatulco, Oaxaca, Mexico and II-III in the area(s) of Mexico at Xadani, Oaxaca and Mexico City. This is the first event of M>=5 within about 100 km of this epicenter since an M 5.4-5.5 on October 14, 2017. Most of the recent activity in the area including an M 5.8 on January 21, 2019 has been occurring about 100-150 km south of this off the  Oaxaca coast and has not been widely felt. Forecast 112953 expected today's event was likely within about 100 km around January 27. This epicenter is at 102 degrees from the Loyalty Islands and may have been promoted by concentrated seismic energy from that source.

 

O: 29JAN2019 00:53:20  16.7N   94.9W Mw=5.0  EMSC   OAXACA, MEXICO               

P: 27JAN2019 112953    17.0N   94.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

An earthquake of M 5.0 occurred east of Tokyo, Japan today. The last earthquake of M>=5 within about 100 km of today's epicenter was an M 5.9 on July 7, 2018. Forecast 113005 had expected today's event within about 50 km was likely around January 30. This earthquake occurred within about an hour of local solar noon, a prime time for tidal stresses. It may also have been  promoted by geomagnetic effects from the geomagnetic storm which concluded three days ago as noted in previous issues of this summary:

 

"Increased seismicity in eastern Honshu at this time may be related to the current geomagnetic storm. This region often sees enhanced seismicity related to geomagnetic storms." (January 25-27, 2019)

 

O: 29JAN2019 03:42:20  34.9N  141.2E Mw=5.0  EMSC   OFF EAST COAST OF HONSHU, JAPA

P: 30JAN2019 113005    35.0N  142.0E 4.0-5.5 AAAAA  Off East Coast Honshu      

 

A moderate M 5.5 also continued the activation of the Fiji Islands which began several days ago with the geomagnetic storm. This event was not felt in the epicentral area due to its deep focus (621 km) and the sparse population density in the  region. It is the strongest event within about 150 km of this epicenter since an M 5.9 on May 1, 2018. Forecast 113101 had expected this event within about 30 km was likely around January 29.

 

O: 28JAN2019 16:00:14  18.0S  179.3W Mw=5.5  EMSC   FIJI REGION                  

P: 29JAN2019 113101    18.0S  179.0W 4.0-5.6 AAAAA  Tonga Islands              

 

An M 4.1 in Java, Indonesia today may reflect stresses from a tropical cyclone passing to the south. Several smaller events of M 3.5-4.0 also occurred in conjunction with this storm in Bali and Sumbawa. This summary had expected this activity in late January in forecast 112942 and in the "weather" section as:

 

"TC Riley (11S) continued today south of Java, Indonesia with winds up to 50 kts. It is  expected to track to the west over the next several days possibly promoting seismicity in the region of entral Indonesia to Bali and Java." (January 27-28, 2019)

 

Java is also at 103 degrees from Anchorage, Alaska and from the South Sandwich Islands where recent major earthquakes may have promoted seismicity in Java.

 

O: 28JAN2019 14:00:25   8.2S  107.2E ML=4.1  EMSC   JAVA, INDONESIA              

P: 23JAN2019 112942     9.0S  108.0E 4.0-5.6 BAAAA  So. of Java                

 

SOUTHWEST PACIFIC CONTINUES ACTIVE

 

EARTHQUAKE SUMMARY FOR JANUARY 27, 2019

 

The strongest seismicity in the world today continued in the Fiji Islands to Vanuatu and the Solomon Islands. This activity occurred at the geomagnetic storm came to an end and may continue for several more days. This region is near the geomagnetic equator and can be activated by geomagnetic storms. The largest event in the world today was an M 5.8 in the Central Fiji Islands, but a number of other moderate earthquakes also hit the area including the Santa Cruz Islands (4.8), northern Vanuatu (M 4.9), Samoa (M 4.8) and a wide area of the Fiji Islands (M 4.5, 4.5, 5.8). Forecasts 113093-113110 covered seismicity in this area at the end of January.

 

O: 27JAN2019 19:35:39   9.3S  159.3E mb=4.8  EMSC   SOLOMON ISLANDS              

P: 30JAN2019 113093    10.0S  162.0E 4.0-5.5 BACAA  No. of Santa Cruz Islands  

 

O: 28JAN2019 03:10:16  13.4S  166.5E mb=4.9  EMSC   VANUATU                      

P: 21JAN2019 113102    13.0S  167.0E 4.0-5.5 CAAAA  Vanuatu Islands            

 

O: 28JAN2019 05:29:46  14.7S  175.5W mb=4.8  EMSC   SAMOA ISLANDS REGION         

P: 27JAN2019 113094    15.0S  176.0W 4.0-5.6 AAAAA  Samoa Islands              

 

O: 27JAN2019 10:16:27  20.2S  177.8W Mw=5.8  EMSC   FIJI REGION                  

O: 28JAN2019 00:00:26  21.2S  178.9W mb=4.5  EMSC   FIJI REGION                  

P: 31JAN2019 113112    21.0S  174.0W 4.0-5.7 BACAA  Tonga Islands              

 

O: 27JAN2019 07:14:04  24.3S  179.1W mb=4.5  EMSC   SOUTH OF FIJI ISLANDS        

P: 31JAN2019 113113    23.0S  180.0W 4.0-5.7 BBAAA  Tonga Islands              

 

The strongest earthquake in the U.S. or Canada today was an M 3.7 in Southern Alaska. NEIC reported this earthquake of M 3.7 in Southern Alaska was felt with intensity II-III in the area(s) of Homer, Alaska.  This is the strongest earthquake within about 100 km of this epicenter since an M 4.0 on July 7, 2018. Forecast 113074 expected today's event within about 50 km was likely around January 25.

 

O: 27JAN2019 10:31:33  59.9N  153.0W mb=3.7  EMSC   SOUTHERN ALASKA              

P: 25JAN2019 113074    60.1N  153.4W 3.2-5.0 AAAAA  Central Alaska             

 

An earthquake of M 3.7 also occurred in Hawaii today.  NEIC reported this earthquake of M 3.7 in Hawaii was felt with intensity II-III in the area(s) of Captain Cook, Hawaii.  The last earthquake in Hawaii of M>=3.7 was an M 5.3 which ended the eruption and seismicity in the area on July 31, 2018.  This may be the beginning of a new round of seismicity in Hawaii and more such earthquakes may follow. Forecast 112957 expected this event was likely around January 26.

 

O: 27JAN2019 18:24:04  19.4N  155.6W ML=3.7  EMSC   ISLAND OF HAWAII, HAWAII     

P: 26JAN2019 112957    19.2N  155.2W 3.0-4.8 AAAAA  Hawaii                     

 

An unusually large M 3.3 hit southern Quebec, Canada today. It occurred within 5 minutes of local solar midnight and may have been enhanced by tidal stresses which maximize at this hour. It was also in the longitude zone where stresses were maximized at the full moon. This is the strongest earthquake within about 100 km of this epicenter since an M 3.7 on September 9, 2015. Forecast 113041  had expected this event within about 50 km was likely around January 29.

 

O: 28JAN2019 04:56:59  46.2N   75.8W ML=3.3  EMSC   SOUTHERN QUEBEC, CANADA      

P: 29JAN2019 113041    45.7N   75.2W 2.0-4.0 AAAAA  New York State             

 

STRONG SEISMIC ENHANCEMENT CONTINUES ALONG GEOMAGNETIC EQUATOR

 

EARTHQUAKE SUMMARY FOR JANUARY 26, 2019

 

The series of moderately strong to strong earthquakes continued today along the geomagnetic equator. These included an M 6.2 in Fiji, a M 5.8-6.6 in New Guinea, Indonesia, an M 5.1 in central Philippines and an M 5.5 in southern Colombia as well as an M 5.5 in northern Honshu, Japan, not on the geomagnetic equator. This activity had been expected in this summary to accompaany and follow the current geomagnetic storm which is now ending as:

 

"This is the strongest geomagnetic storm since AP reached 24 on December 28, 2018. The strong geomagnetic storm could bring enhanced seismicity to the geoequatorial zones and at high latitudes in the next several days through January 29." (January 24-26, 2019)

 

Strongly enhanced seismicity continued along western South America today. An M 5.6 in southern Colombia was felt with intensity V in Teruel Huila, Colombia and IV in Palmira Valle del Cauca and Cali Valle, Popa, Calarca and Ibaque and II-III in Armenia, Yumbo, Jamundi and Candelaria, Colombia.  This is the strongest earthquake in Colombia within about 200 km of this epicenter since an M 5.6 on February 22, 2015 although an M 5.5 was felt in the region on February 6, 2017. A major earthquake of M 7.2 hit the region on September 30, 2012 with M 7.3 about 150 km southwest of today's epicenter. Forecat 112918 had expected today's event in this area was likely around January 24. This epicenter is at 103 degrees from the Komandorsky Islands M 7.3 of December 20, 2018 and from the M 8.2 in Fiji of August 19, 2018, the last great earthquake in the world and was likely promoted from those sources.

 

O: 26JAN2019 12:32:27   3.0N   75.8W Mw=5.5  EMSC   COLOMBIA                      

O: 26JAN2019 12:32:27   3.0N   75.8W Mw=5.6  ANSS   COLOMBIA                     

O: 26JAN2019 13:10:00   3.0N   76.0W ML=4.4  EMSC   COLOMBIA                     

P: 24JAN2019 112918     5.0N   76.0W 4.0-5.6 ABAAA  Colombia                   

 

An earthquake of M 5.5 also shook northern Japan today. NEIC reported it was felt with intensity IV in Machinohe, Aomori and Misaw and II-III in Morioka and Shizukuishi, Iwate, Japan. This is the strongest earthquake within about 100 km of this epicenter in the past year since an M 6.2 on January 24, 2018 and prior to that on September 26, 2017 as an M 5.8-5.9. Forecasts 113006 and 113030 had expected activity in this area at the end of January. In the previous issue of this summary it was speculated that further enhanced seismicity in the region of Japan could continue in response to the current geomagnetic storm as:

 

"Increased seismicity in eastern Honshu at this time may be related to the  current geomagnetic storm. This region often sees enhanced seismicity related to geomagnetic storms." (January 25-26, 2019)

 

O: 26JAN2019 08:23:03  40.3N  142.3E Mw=5.5  EMSC   NEAR EAST COAST OF HONSHU, JAP

P: 23JAN2019 113006    39.0N  141.0E 4.0-5.5 BBAAA  Off East Coast Honshu      

P: 30JAN2019 113030    42.0N  144.0E 3.5-5.6 BBBAA  Hokkaido, Japan            

 

The strongest earthquake in the world today was an M 6.2 in the active Fiji Islands. It was not reported felt in this region which is south of the previous recent strong activity in the region. This is the strongest earthquake within  about 150 km of this epicenter in about two years, since an M 6.9 on February 24, 2017. Forecast 113112 had expected a moderately large event to the east of this at the end of January.

 

O: 26JAN2019 19:56:43  21.2S  178.9W Mw=6.2  EMSC   FIJI REGION                  

P: 31JAN2019 113112    21.0S  174.0W 4.0-5.7 BACAA  Tonga Islands              

 

A moderate earthquake of M 5.1 also occurred near the geomagnetic equator

in Samar, Philippines today. PHIVOLCS reported this earthquake was felt with intensity IV in Hernani Salcedo and Gen. Macarthur, Eastern Samar; III in Tacloban City; Babtngon and Barugo, Leyti' Borongan City, San Julian, Quinapondan, Maydolong and Dolores, Eastern Samar and II in Palo, Leyte. This is the strongest earthquake within about 150 km of this epicenter since an M 5.6 on May 10, 2018. Forecast 112960 expected it within about 50 km  at the end of January.

 

O: 27JAN2019 06:24:55  11.5N  125.8E mb=5.1  EMSC   SAMAR, PHILIPPINES           

O: 27JAN2019 06:24:53  11.5N  126.0E MS=5.1  PHI  Felt with intensity IV

P: 23JAN2019 112960    11.0N  126.0E 3.5-5.0 BAAAA  Luzon, Philippines         

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 off the coast of Oregon.

 

This summary had anticipated this event as promoted from the M 6.7 in the Prince Edward Islands region of the South Indian Ocean as an example of antipodal triggering as:

 

"Seismicity off the coast of northern California to Washington may be enhanced by antipodal focusing of energy from the Prince Edward Islands. The active seismic area off the west coast of Oregon is about 8 degrees east of the true antipode from the Prince Edward Islands region. While a major earthquake is not expected at this time off Oregon increases in magnitude beyond those previously expected could be +0.5-1.0 units." (January 22-23, 2019)

 

This is the strongest earthquake off the coast of Oregon within about 100 km of this epicenter since an M 5.3 on July 2, 2018 and prior to that an M 4.8 on October 9, 2016, a distinct enhancement of seismicity in the area.

 

O: 27JAN2019 03:40:51  44.6N  130.0W mb=4.5  EMSC   OFF COAST OF OREGON          

O: 27JAN2019 03:40:51  44.6N  129.9W mb=4.5  ANSS   the coast of Oregon

 

An unusual earthquake of M 2.9 occurred near Pecos, New Mexico today.  NEIC reported this earthquake of M 2.9 in New Mexico was felt with intensity I-II in the area(s) of New Mexico at Santa Fe, San Jose and Mora and in Durango, Colorado. This is the strongest earthquake within about 100 km of this epicenter since an M 3.0 on March 31, 2013 and prior to that an M 3.5 on October 17, 2011.  Forecasts 112991 and 113008 had expected regional activity at the end of January.

 

O: 26JAN2019 07:21:53  35.8N  105.7W ML=2.9  EMSC   NEW MEXICO                   

O: 26JAN2019 07:21:53  35.8N  105.7W ml=2.9  ANSS   Pecos New Mexico

P: 21JAN2019 112991    37.1N  104.7W 2.0-4.2 BBAAA  Colorado area              

P: 29JAN2019 113008    35.4N  101.8W 2.0-4.2 BACAA  SW U.S.A                   

 

An unusual earthquake of M 2.0 also occurred today in eastern Kentucky near the Ohio border. It was not reported felt. The last earthquake of M>=2 within about 100 km of this epicenter was an M 2.3 on March 25, 2018 and prior to that an M 2.8 on December 17, 2017. Forecast 113047 had expccted seismic activity to the north of this in Ohio around January 29.

 

O: 26JAN2019 12:11:29  38.5N   83.9W Md=2.0  EMSC   EASTERN KENTUCKY             

O: 26JAN2019 12:11:29  38.5N   83.9W md=2.0  ANSS   Mount Olivet Kentucky

P: 29JAN2019 113047    40.0N   84.0W 2.0-4.1 ABAAA  Ohio/Lake Erie             

 

STRONG SEISMICITY IN SOUTHWEST PACIFIC RELATED TO GEOMAGNETIC STORM

 

EARTHQUAKE SUMMARY FOR JANUARY 25, 2019

 

A pair of moderately strong to strom earthquakes occurred today in the Southwest Pacific. These occurred as an M 5.7 in the Santa Cruz Islands followed nearly two hours later by an M 6.2 in the Solomon Islands. Both these epicenters lie within about 5 degrees of the geomagnetic equator and both occurred within about an hour of local solar noon, a prime time for geomagnetic and tidal  effects to promote seismicity. The current geomagnetic storm was expected to enhance seismicity at this time as noted in previous summaries:

 

"This is the strongest geomagnetic storm since AP reached 24 on December 28, 2018. The strong geomagnetic storm could bring enhanced seismicity to the geoequatorial zones and at high latitudes in the next several days through January 29." (January 25-26, 2019)

 

The last earthquake in the Solomon Islands of M>=6.2 occurred two years ago as an M 7.9 on January 22, 2017. The only earthquake in this magnitude range and area with depth greater than the 357 km depth of today's event in the past 30 years was an M 6.4 on February 7, 2011. Forecast 112945 had expected today's event within about 50 km of this epicenter was likely at the end of January.

 

O: 26JAN2019 03:51:38   7.1S  156.3E Mw=6.2  EMSC   SOLOMON ISLANDS              

P: 31JAN2019 112945     7.0S  156.0E 4.0-5.6 BAAAA  Solomon Islands            

 

The last earthquake in the Santa Cruz Islands within about 200 km of today's epicenter there with equal or greater magnitude was an M 5.9 on July 17, 2018. An M 5.8 also hit the area ib September 6, 2016 within about 20 km of tod's epicenter. Forecast 113102 had expected today's event within about 100 km was likely around January 26.

 

O: 26JAN2019 02:07:21  10.8S  166.0E Mw=5.7  EMSC   SANTA CRUZ ISLANDS           

P: 26JAN2019 113102    11.0S  165.0E 4.0-5.6 AAAAA  Vanuatu Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 4.0 in the central Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote area. Two earthquakes of M 4.4 and 4.6 hit this area on January 13 and 14, 2019 after a long quiet from July 13, 2018 which saw an M 4.3. Forecast 113058 had expected today's activity was likely around January 22.

 

O: 25JAN2019 08:43:31  51.3N  176.5W mb=4.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 22JAN2019 113058    51.7N  178.3W 3.5-5.1 BAAAA  Andreanoff Isls, Aleutians 

 

A moderate earthquake of M 4.5 shook the region south of the Marmara Sea in Western Turkey today. This follows an M 5.3 southwest of this in Turkey January 24 and an M 4.8 January 22 and may have triggered by regional stress redistribution from those events. NEIC reported this earthquake of M 4.3 in Turkey was felt with intensity II-III in the area(s) of Turkey at Izmir, Foca and Manisa. The last earthquake within about 200 km of this epicenter in western Turkey was an M 4.6 on December 25, 2017.  Forecast 112983 had expected today's event within about 50 km was likely around January 27. This activity is located at 144 degrees from the strong swarm in the Loyalty Islands of early December. Seismic energy is concentrated on the surface at this distance from strong events.

 

O: 25JAN2019 20:20:33  38.6N   27.1E ML=4.5  EMSC   WESTERN TURKEY               

P: 27JAN2019 112983    39.0N   27.0E 3.0-4.6 AAAAA  Aegean Sea                 

 

Increased seismicity in eastern Honshu at this time may be related to the  current geomagnetic storm. This region often sees enhanced seismicity related to geomagnetic storms. The only such event today was an M 4.4 in eastern Honshu, Japan. This is first event of M>=4.4 within about 100 km of this epicenter in eastern Honshu, Japan since an M 5.1 on January 14, 2019 and prior to that July 29, 2018 when ann M 4.4 was recorded. Today's event occurred at an intermediate depth of 117 km - the deepest in the  area since an M 4.4 on December 15, 2017. Forecast 113005 had expected today's activity within about 50 km was likely around January 25.

 

O: 26JAN2019 00:31:30  36.4N  140.0E mb=4.4  EMSC   EASTERN HONSHU, JAPAN        

P: 25JAN2019 113005    36.0N  140.0E 4.0-5.6 AAAAA  Off East Coast Honshu      

 

TIDAL, GEOMAGNETIC PROMOTION STRONG IN SOUTH AMERICA

 

EARTHQUAKE SUMMARY FOR JANUARY 24, 2019

 

A moderately strong earthquake of M 5.6 hit the region of Southern Peru today. This earthquake was reported by NEIC to have been felt with maximum intensity VI in  Rio Grande, Arequipa, Peru and V in Nazca, Ica, Peru. Lesser shaking of II-III was felt in Peru at Vista Alegre, Ica, Subtanjalla, Piscolca, Puquio, Imperial, Lima, Llala and Matucana and in general within about 300 km of the epicenter. An earlier event about 500 km north of this epicenter occurred earlier in the day with M 5.1. It was felt with intensity III in Pucallpa and Huanuco, Peru. The M 5.6 event occurred within about 15 minutes of local solar midnight in a zone where tidal stresses were maximized at the full moon and was probably promoted by these stresses as emphasized in previous issues of this summary:

 

 

"The full moon arrived at 05:16 UT on January 21, 2019. This is an especially powerful tidal event as the moon is a supermoon (closest to earth) and this will be a total lunar eclipse. Longitudes which will experience maximum tidal stresses at this time are near 80 West and 100 East longitudes and include in the west western South America and Central America and portions of the East Pacific Rise and central U.S. In the east this maximum passes through western Indonesia including southeast Asia and Sumatra, Indonesia These are most likely to see tidal tiggering at this time, bu many regions can see tidal triggering at this time." (January 21-23, 2019)

 

The events in Peru are near the geomagnetic equator and were also probably promoted by a geomagnetic storm which occurred today as noted in this summary:

 

"The geomagnetic field saw disturbed conditions today. The AP level was 19. High latitude geomagnetic field also saw disturbed  conditions  with AP at 1. This is the strongest geomagnetic storm since AP reached 24 on December 28, 2018. The strong geomagnetic storm could bring enhanced seismicity to the geoequatorial zones and at high latitudes in the next several days." (January 24, 2019)

 

The M 5.7 in southern Peru is the strongest within about 200 km of this epicenter since an M 7.1 about 150 km to the south that occurred a year ago on January 14. 2018. Forecast 113090 had expected this event was likely around January 25. The event of M 5.1 to the north occurred in the vicinity of forecast 112939.

 

O: 24JAN2019 15:56:05   9.6S   74.7W mb=5.1  EMSC   CENTRAL PERU                 

P: 21JAN2019 112939     8.0S   78.0W 4.0-5.6 BBCAA  No. Peru                    

 

O: 25JAN2019 04:45:20  14.5S   75.4W Mw=5.7  EMSC   NEAR COAST OF CENTRAL PERU   

P: 25JAN2019 113090    14.0S   73.0W 4.0-5.6 AABAA  Central Peru               

 

An earthquake of M 5.5 also occurred in the Philippines near the geomagnetic equator. NEIC reported this earthquake of M 5.5 in the northern Philippines was felt with intensity II-III in the area(s) of Davila Ilocos, Aparri Cagayan Valley and Laoag, Ilocos, Philippines. PHIVOLCS reported it was felt with intensity V in Calayan, Cagayan; IV in Aparri, Claveria and Pamplona, Cagayan; Laoag City; Adams, Bacarra Bangui Batar, Currimao, Dingras, Pagudpud, Pasuquin, Sn Nicolas and Vintar, Ilocoa Norte; III in Clcata Cagayan, Cervantes and Sinalt, Ilocos Sur and II in Gonzaga and Santa Ana, Cagayan, Philippines.

It occurred within about half an hour of local solar noon and was probably also promoted by strong tidal stresses which maximize at this hour. This is the strongest earthquake in northern Philippines within about 200 km of this epicenter since an M 5.6 nearly three years ago on March 12, 2016. The last of significantly larger magnitude was an M 5.7 on December 31, 2013.

 

O: 24JAN2019 08:34:54  19.2N  121.2E Mw=5.5  EMSC   BABUYAN ISL REGION, PHILIPPINE

O: 24JAN2019 08:34:53  19.2N  121.3E MS=5.5  PHI  Felt with intensity V

 

The strongest earthquake in the U.S or Canada today was an M 4.0 in the Kodiak Island region of southern Alaska. This is the strongest shallow focus earthquake within about 150 km of Kodiak Islands since an M 4.2 to the west on July 1, 2019. Rorecast 113074 had expected regional activity around January 25.

 

O: 25JAN2019 03:48:59  57.4N  154.6W mb=4.0  EMSC   KODIAK ISLAND REGION, ALASKA 

P: 25JAN2019 113074    60.1N  153.4W 3.2-5.0 ACAAA  Central Alaska              

 

An unusual earthquake of M 2.5 was felt in South Carolina today. NEIC reported this earthquake of M 2.5 in South Carolina was felt with intensity IV in Lexington, SC and II-III in the area(s) of South Carolina at Jenkinsville, Chapin, Newberry, Ridgeway, Columbia, Elgin, Saint Matthews and Orangeburg. This is the strongest earthquake within about 100 km of this epicenter since an M 2.9 on March 21, 2011. Forecast 112994 had expected regional seismicity was possible around January 21.

 

O: 24JAN2019 09:03:29  34.3N   81.3W Md=2.5  EMSC   SOUTH CAROLINA               

O: 24JAN2019 09:03:29  34.3N   81.3W md=2.5  ANSS   Chapin South Carolina

P: 21JAN2019 112994    36.0N   83.0W 2.0-4.1 BBBAA  Kentucky/Tennessee/NC      

 

An unusually large earthquake of M 5.3 also occurred in the Lardos area of the Dodecanese Islands, Greece today.  NEIC reported this earthquake of M 5.3 in the Dodecanese Islands, Greece  was felt with intensity IV in Marmara, Turkey and II-III in the area(s) of Greece at Lardos, and Rodos.  This is the strongest earthquake within about 150 km of this epicenter in Greece since and M 5.3 of August 8, 2017 and may be an aftershock of an event about 100 km to the west which occurred with M 6.8 on July 20, 2017. Forecast 113019 had expected today's event in this area was possible with magnitude up to M 5.3 around January 24.

 

O: 24JAN2019 14:30:54  36.0N   28.2E mb=5.3  EMSC   EASTERN MEDITERRANEAN SEA    

O: 24JAN2019 14:30:49  36.0N   28.2E mw=5.3  ANSS   ESE of Lardos Greece

P: 24JAN2019 113019    37.0N   29.0E 3.5-5.4 AAAAA  Turkey                     

 

STRONG PRINCE EDWARD ISLANDS QUAKE MAY AFFECT SEISMICUTY WEST OF OREGON

 

EARTHQUAKE SUMMARY FOR JANUARY 22, 2019

 

The largest earthquake in the world today was an M 6.7 near Prince Edward Island, South Indian Ocean. It was not reported felt in this remote area. Seismicity off the coast of northern California to Washington may be enhanced by antipodal focusing of energy from the Prince Edward Islands. The active seismic area off the west coast of Oregon is abou 8 degrees east of the true antipode from the Prince Edward Islands region. While a major earthquake is not expected at this time off Oregon increases in magnitude beyond those previously expected could be +0.5-1.0 units. The last earthquake of M>=6.7  within about 300 km of today's epicenter in the Prince Edward Islands region  occurred within about 100 km of today's epicenter on April 28, 1997 with M 6.8 and is the only such event in the region in at least 30 years.  This epicenter may have been promoted to seismicity from the M 6.8 under Brazil of January 5, 2019 which lies at 101-102 distance from this epicenter, a distance at which seismic enhancement is expected following large earthquakes.

 

O: 22JAN2019 19:01:43  43.1S   42.2E mw=6.7  ANSS   Prince Edward Islands region"

O: 22JAN2019 19:01:44  43.1S   42.2E Mw=6.7  EMSC   PRINCE EDWARD ISLANDS REGION 

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in the Anchorage, Alaska aftershock zone following the M 7.1 there on November 30, 2018. NEIC reported today's event was felt with intensity II-III within about 100 km of this epicenter. Felt reports at this intensity came from Alaska at Willow, Wasilla, Elmendorf AFB, Anchorage, and Fort Richardson among others.

This is the second strongest aftershock within about 50 km of this epicenter since the mainshock of November 30, 2018. The other was an M 5.0 on January 13, 2019. Forecast 113075 had expected today's event was likely around January 24.

 

O: 23JAN2019 05:41:47  61.5N  150.2W Mw=4.5  EMSC   SOUTHERN ALASKA              

P: 24JAN2019 113075    61.3N  150.0W 3.2-5.0 AAAAA  Central Alaska             

 

 

A light earthquake in the Brawley area of Southern California with M 3.6. NEIC reported this event was felt with intensity IV in Brawley, California and II-III in Imperial, Westmorland, El Centro, Mexicali, Baja, Lakeside and Pinon Hills, California. NEIC reported an aftershock of M 2.7 in Southern California was felt with intensity II-III in the area(s) of Brawley, Imperial, Escondido, San Diego, California. This is part of a series that began with an M 3.9 on January 17, 2019 and is the second largest in the series. Forecast 113010 had expected today's event was likely around January 25.

 

O: 22JAN2019 08:24:44  32.9N  115.5W ml=3.6  ANSS   SSE of Brawley CA            

O: 22JAN2019 21:36:23  33.1N  115.6W ml=2.0  ANSS   WNW of Calipatria CA         

P: 25JAN2019 113010    33.7N  116.1W 2.5-4.5 BAAAA  So. California             

 

STRONG SUB-SOLAR QUAKE HITS WESTERN INDONESIA

 

EARTHQUAKE SUMMARY FOR JANUARY 21, 2019

 

A strong earthquake of M 6.4 hit south of Sumbawa, Indonesia today. It was reported felt with intensity II in Mataram, Indonesia by NEIC. This event occurred within about an hour of local solar noon, a prime time for high tidal stresses which can help promote seismicity. The epicenter was nearly sub-solar at the time of the earthquake. This region of Indonesia had been expected in previous issues of this report to see tidal triggering at this time as:

 

"The full moon arrived at 05:16 UT on January 21, 2019. This is an especially powerful tidal event as the moon is a supermoon (closest to earth) and this

will be a total lunar eclipse. Longitudes which will experience maximum tidal stresses at this time are near 80 West and 100 East longitudes and include in the west western South America and Central America and portions of the East Pacific Rise and central U.S. In the east this maximum passes through western Indonesia including southeast Asia and Sumatra, Indonesia. These are most likely to see tidal tiggering at this time, bu many regions can see tidal triggering at this time." (January 21, 2019)

 

The mainshock of M 6.4 was preceded by an M 6.0 several hours earlier which was felt with intensity II in Bali, Indonesia. The M 6.4 is the strongest earthquake within about 200 km of today's epicenter in at least 30 years. The most recent nearby event was an M 6.6 about 250 km to the northwest of this on November 8, 2009.  Forecast 113098 had expected this earthquake was likely within about 100 km around January 22. This epicenter is located at 100 degrees from the Anchorage, Alaska quake (M 7.0) of November 30, 2018 and at 105 degrees from the South Sandwich Islands M 7.1 of December 11, 2018 and was probably promoted by concentrated seismic energy from these events. Energy from large earthquakes is returned to the surface after reflection and refraction off the core-mantle boundary to areas between 100 and 106 degrees on the surface from the mainshock and is often associated with enhanced seismicity in this distance range..

 

O: 22JAN2019 00:56:54  10.3S  118.9E mb=4.5  ANSS   SSW of Kahale Indonesia      

O: 21JAN2019 23:59:22  10.3S  119.1E mw=6.0  ANSS   SSW of Bogorawatu Indonesia  

O: 22JAN2019 01:57:00  10.4S  119.1E mb=4.8  ANSS   SSW of Bogorawatu Indonesia  

O: 22JAN2019 00:08:31  10.4S  119.1E mb=4.9  ANSS   SSW of Bogorawatu Indonesia  

O: 22JAN2019 05:10:03  10.5S  119.0E mw=6.4  ANSS   SSW of Bogorawatu Indonesia  

P: 22JAN2019 113098    11.0S  118.0E 4.0-5.7 AAAAA  So. of Indonesia           

 

The strongest earthquake in the U.S. or Canada today was an M 5.2 in the Alaska Peninsula.

NEIC reported it was widely felt up to about 500 km from the epicenter with light to moderate shaking of intensity II-III in Alaska at King Salmon, Kodiak, Homer, Cooper Landing, and Anchorage. The last earthquake in the Alaska Peninsula with M>=5.2 within about 150 km of today's epicenter occurred May 11, 2018 about 100 km south of today's epicenter. Forecast 113074 expected activity in this area was likely around January 25.

 

O: 22JAN2019 04:43:19  58.3N  155.4W mw=5.2  ANSS   Alaska Peninsula             

P: 25JAN2019 113074    60.1N  153.4W 3.2-5.0 BBAAA  Central Alaska              

 

An earthquake of M 4.5 in Guadeloupe preceded that activity in Sumbawa, Indonesia. The Guadeloupe epicenter occurred within about an hour of local solar noon and was nearly antipodal to the subsequent activity in Indonesia. NEIC reported the event in Guadeloupe was felt with intensity VI in Terre-de-Bas; Baie-Mahault and  and II-III in Petit-Bourg, Guadeloupe. The last earthquake of M>=4.5 within about 200 km of this epicenter in the region of Guadeloupe occurred as an M 4.5 on April 28, 2018 and prior to that an M 4.6 on September 15, 2017. The last of significantly larger magnitude was an M 5.8 on February 3, 2017. Forecast 112958 had expected this activity was likely around January 24, 2019 within about 50 km of the epicenter.

 

O: 21JAN2019 14:42:48  15.8N   61.7W mb=4.5  ANSS   S of Terre-de-Bas Guadeloupe 

P: 24JAN2019 112958    16.0N   62.0W 3.0-5.1 BAAAA  Leeward Islands            

 

An M 5.8 also occurred today off the south coast of Oaxaca, Mexico. NEIC reported it was felt with intensity IV in Oaxaca at Kadani, Guichicovi, and in Tuxtla Gutierrez, Chiapas, Mexico. Lesser shaking of II-III was reported in Oaxaca at Matias Romero, Huatulco, Pochutia, Puerto Escondido and at Coatepec, Veracrus and Mexico City. This earthquake occurred within minutes of local solar midnight, a time when tidal forces are at maximum and was probably enhanced by these. This is the strongest earthquake within about 150 km of this epicenter since an M 6.1 on September 23, 2017, an aftershock of an M 8.1 of September 8, 2017. Forecast 112787 had expected this earthquake was likely around January 18 within about 100 km of the epicenter.

 

O: 21JAN2019 11:57:17  15.6N   94.7W mw=5.8  ANSS   Francisco del Mar Mexico     

P: 18JAN2019 112787    15.0N   94.0W 3.5-5.4 BAAAA  Chiapas, Mexico            

 

PAIR OF NEW CALEDONIA QUAKES PROMOTED BY TIDES; CHILE

 

EARTHQUAKE SUMMARY FOR JANUARY 20, 2019

 

The strongest earthquakes in the world today were a pair of aftershocks of M 5.5 and M 5.7 in the Loyalty/New Caledonia Islands of the Southwest Pacific. They were not reported felt in this remote area. These events are at 103 degrees from the M 6.7 in the Coquimbo, Chile region which occurred earlier in the day and was discussed in the previous issue of this summary as:

 

"This epicenter (in Chile) is located at 102 degrees from the major earthquake of M 7.6 and aftershocks in the region of the Loyalty Islands which occurred on December 5, 2018. Seismic energy from major earthquakes reflects off core-mantle boundaries and returns in concentrated form to the surface at distances of 101-104 degrees where it can help promote further seismicity as apparently happened in this case." (January 20, 2019)

 

The timing of these two earthquakes also appears to be related to the full moon tidal stresses. The M 5.5 occurred within about half an hour of local solar noon when tidal effects from the full moon are maximized. These epicenters were almost exactly sub-solar (sun directly overhead) at the time of the earthquakes. The M 5.7, the strongest long-term aftershock of the M 7.6 of December 5, 2018 occurred about an hour later. This summary had expected seismic activity related to the full moon in previous issues as:

 

 

"The full moon will arrive at 05:16 UT on January 21, 2019. Longitudes which will experience maximum tidal stresses at this time are near 80 West and 100 East longitudes and include in the west western South America and Central America and portions of the East Pacific Rise and central U.S. In the east this maximum passes through western Indonesia including southeast Asia and Sumatra, Indonesia. These are most likely to see tidal tiggering at this time, but many regions can see tidal triggering at this time. ... " (January 19-20, 2019)

 

Forecast 113106 had expected this activity was likely in the Loyalty Islands around January 24.

 

O: 21JAN2019 00:35:45  21.9S  169.0E mw=5.5  ANSS   Tadine New Caledonia         

O: 21JAN2019 01:36:36  21.9S  169.1E mw=5.7  ANSS   Tadine New Caledonia         

P: 24JAN2019 113106    22.0S  171.0E 4.0-5.8 BABAA  Loyalty Islands             

 

The largest earthquake in the U.S. or Canada today was an M 4.9 in the Rat Islands of western Aleutians, Alaska. It was not reported felt in this remote epicentral region. The last earthquake of M>=4.9 in the Rat Islands within about 200 km of today's epicenter occurred on May 9, 2018 with M 4.9. The last of larger magnitude was an M 5.1 on March 2, 2018.  Forecast 113068 had expected today's epicenter would be active around January 22 within about 50 km of the epicenter.

 

O: 21JAN2019 05:27:23  51.6N  176.3E mb=4.7  ANSS   Buldir Island Alaska         

P: 22JAN2019 113068    52.0N  176.0E 4.0-6.0 AAAAA  Rat Islands                

 

An earthquake of M 3.6 in Oklahoma today may also have been triggered by tidal stresses from the new moon. NEIC reported this earthquake of M 3.6 in Oklahoma was felt with intensity II-III in the area(s) of Meno, Lahoma and Waynoka, Oklahoma.  The event occurred at 05:27 UT near local solar midnight and within about 10 minutes of the full moon. Stronger earthquakes in this region of Oklahoma often coincide with full moons  or new moons. Tidal stresses probably push water into cracks enabling slippage as noted in previous issues of this summary. The last earthquake of M>=3.6 within about 50 km of today's epicenter was an M 4.4 on June 9, 2018. The relation with lunar tides was emphasized in this summary at the time as:

 

"Stronger earthquakes in Oklahoma often occur near the new or full moons and  may be promoted by tidal forces and their action on ground waters in Oklahoma and Kansas. These often occur near local solar noon or midnight when local tidal stresses maximize." (June 10, 2018)

 

 

O: 21JAN2019 05:27:36  36.4N   98.1W ml=3.6  ANSS   20km SE of Helena, Oklahoma  

P: 21JAN2019 113017    36.0N   97.0W 2.0-4.0 AAAAA  Southern Plains            

 

STRONG EARTHQUAKE DAMAGES CENTRAL CHILE

 

EARTHQUAKE SUMMARY FOR JANUARY 20, 2019

 

A strong earthquake of M 6.7 hit the region of Central Chile near Coquimbo today. NEIC reported strong shaking with maximum intensity VII in Coquimbo at Coquimbo, La Serena, and Ovalle; VI in Andacollo, Vicuna, Illapel, and IV in  areas within about 350 km of the epicenter including Valparaiso at La Ligua, Cabildo and Caleara and in Vallenar, Atacama, Chile. GUC reported this earthquake of M 6.7 was felt with intensity  VIII in  Coquimbo at La Serena; VII in Vicuna, VI in La Higuera; IV in Los Vilos; in Atacama with VI in Caldera, Chanaral, Freirinha, Huasco, Vallenar; V in Alto del Carmen, Copiapo, Tierra Amarilla, IV in Caldera, Chanaral, Diego de Almagro, in Valparaiso with V in Calera, Casablanca, La Cruz, Llaillay, Nogales, Olmue, Puchuncavi, Putendo, Quillota, San Felipe, Santa Maria, Valparaiso, VI in Zapallar, IV ini Quilpue, Los Andes, and III in Algarrobo, Cartagena, El Quisco, El Tabo, San Antonio, Santo Domingo; in Santiago with V in El Monte, Padre Hurtado, Penaflor, Puente Alto, San Bernardo, Santiago, Talagante; in O'Higgins with IV in Santa Cruz, San Fernando, Rancagua, Navidad, Mostazal, Litueche, Las Cabras and II-III in Chimbarongo, Graneros, La Estrella, Peralillo, Chile. It is likely that high tidal stresses associated with the full moon helped enhance this earthquake at this time. The earthquake occurred near local solar midnight, a time when tidal stresses are maximized. In the previous issue of this report these had been expected in the areas as:

 

"The full moon will arrive at 05:16 UT on January 21, 2019. Longitudes which will experience maximum tidal stresses at this time are near 80 West and 100 East longitudes and include in the west western South America and Central America and portions of the East Pacific Rise and central U.S. In the east this maximum passes through western Indonesia including southeast Asia and Sumatra, Indonesia. These are most likely to see tidal tiggering at this time, but many regions can see tidal triggering at this time. A major nor'easter off the east coast  of North America could enhance stresses in this area in the next several days. This includes enhanced seismicity along the northwestern Pacific-North American plate junctions." (January 19-20, 2019)

 

A number of moderate aftershocks of the Chile earthquake were also reported felt lightly in the Coquimbo area. At least two people reportedly died from heart attacks related to the earthquake and more than 200,000 were without power. Landslides occurred in the mountains and a tsunami evacuation was initiated but later cancelled. Minor damage to older buildings in La Serena was reported by no major damage occurred.

 

The last earthquake in the Coquimbo area of central Chile within about 200 km  of today's M 6.7 with M>=6.7 occurred on November 11, 2015 with M 6.9. This was

a regional aftershock about 200 km north of a great M 8.3 in the Coquimbo area which  occurred September 16, 2015.  Forecast 113117 had expected today's event was likely around January 23 within about 50 km  of this epicenter. This epicenter is located at 102 degrees from the major earthquake of M 7.6 and aftershocks in the region of the Loyalty Islands which occurred on December 5, 2018. Seismic energy from major earthquakes reflects off  core-mantle boundaries and returns in concentrated form to the surface at distances of 101-104 degrees where it can help promote further seismicity as apparently happened in this case.

 

O: 20JAN2019 01:32     30.3S   71.4W mb=6.7  GUC    Coquimbo at La Serena; VII in

O: 20JAN2019 04:59:45  30.1S   71.4W mb=4.4  ANSS   SSW of Coquimbo Chile        

O: 20JAN2019 01:32:51  30.1S   71.4W mw=6.7  ANSS   SSW of Coquimbo Chile        

O: 20JAN2019 02:36:00  30.1S   71.5W mb=4.3  ANSS   SW of Coquimbo Chile         

P: 23JAN2019 113117    30.0S   72.0W 4.0-5.6 BAAAA  Coast Central Chile        

 

A strong nor'easter storm hit the northeastern U.S. today and yesterday. The track of this storm ran over land and stresses from this are unlikely to generate a strong or moderate increase in seismicity on the western rim of North America. This requires a push horizontally on the North American plate which is small with land-based storm but strong when storm move up the east coast over water and then hit land in the New England region.

 

A series of light earthquakes in the region of Central California in the Parkfield to San Francisco region continued today following the M 3.7 in San Francisco earlier in the week. iLike the M 3.7-3.8 in San Francisco, these epicenters are located at 103 degrees from the M 7.0 in Mindanao, Philippines of December 29, 2018 and may have been promoted by concentrated energy from that source. Further such regional seismicity is likely by the end of January, 2019.

 

O: 19JAN2019 09:10:36  36.0N  120.6W md=2.5  ANSS   NW of Parkfield CA           

P: 17JAN2019 112808    37.7N  121.7W 2.5-4.6 ABAAA  Central California         

 

NEIC reported this earthquake of M 2.5 in Central California was felt with intensity II-III in the area(s) of San Juan Bautista and Salinas, California.

 

O: 19JAN2019 21:41:46  36.9N  121.6W md=2.5  ANSS   San Juan Bautista CA         

P: 17JAN2019 112808    37.7N  121.7W 2.5-4.6 AAAAA  Central California         

 

O: 19JAN2019 15:00:13  37.9N  121.6W md=2.1  ANSS   Discovery Bay CA             

P: 17JAN2019 112808    37.7N  121.7W 2.5-4.6 AAAAA  Central California         

 

STRONG SEISMICITY RETURNS

 

EARTHQUAKE SUMMARY FOR JANUARY 19, 2019

 

After a week on relatively quiet global seismicity, a series of moderately strong to strong earthquakes hit in Oceanic regions today. These events of M 6.0 occurred in Vanuatu, the East Pacific Rise with an M 5.7 off the coast of Northern Peru. This enhanced activity may be related to the full moon which arrives early on January 21. This summary noted this in the tidal forecast as:

 

"The full moon will arrive at 05:16 UT on January 21, 2019. Longitudes which will experience maximum tidal stresses at this time are near 80 West and 100 East longitudes and include in the west western South America and Central America and portions of the East Pacific Rise and central U.S. In the east this maximum passes through western Indonesia including southeast Asia and Sumatra, Indonesia. These are most likely to see tidal tiggering at this time, bu many regions can see tidal triggering at this time. A major nor'easter off the east coast  of North America could enhance stresses in this area in the next several days. This includes enhanced seismicity along the northwestern Pacific-North American plate junctions." (January 19-20, 2019)

 

A strong earthquake of M 6.0 in the northern East Pacific Rise today was followed by at least three moderated aftershocks. It was not reported felt in this remote area. This event of M 6.0 is the strongest within about 200 km of this epicenter since an M 6.6 on April 29, 2016. This was about 200 km north of today's epicenter. Similar events in the past 30 years occurred as an M 6.0 on March 26, 2012 and an M 6.6 on December 1, 1995. No other events have occurred within about 150 km of today's epicenter in the past 30 years. Forecast 112938 had expected moderately strong seismicity in the East Pacific Rise around

January 18.

 

O: 19JAN2019 02:15:30   7.4N  103.3W mb=4.4  ANSS   Northern East Pacific Rise"

O: 18JAN2019 17:08:40   8.2N  103.3W mb=4.8  ANSS   Northern East Pacific Rise"

O: 19JAN2019 02:24:27   8.3N  103.3W mb=4.6  ANSS   Northern East Pacific Rise"

O: 18JAN2019 16:40:42   8.3N  103.5W mw=6.0  ANSS   Northern East Pacific Rise"  

P: 21JAN2019 112938     4.0S  104.0W 4.0-5.5 AAAAA  East Pacific Rise          

 

The other event of M 6.0 today occurred in the southern Vanuatu Islands. It was not reported felt in this remote area. As it occurred within about half an hour of local solar midnight, it is likely to have been promoted by thidal stresses which maximize near this time. Although a series of strong earthquakes hit south of this in the Loyalty Islands in early December, 2018, the last in Vanuatu within about 200 km of today's epicenter was an M 6.4 on July 13, 2018 and prior to that an M 6.1 on June 21, 2018.  A similar event occurred before that on September 20, 2017 with M 6.4. Forecast 112899 had expected today's event in mid-January. to the south of this epicenter.

 

O: 18JAN2019 13:18:32  19.2S  168.6E mw=6.0  ANSS   WNW of Isangel Vanuatu       

O: 19JAN2019 05:40:35  22.2S  169.5E mb=4.7  ANSS   Tadine New Caledonia         

P: 14JAN2019 112899    22.0S  171.0E 4.0-5.8 BABAA  Loyalty Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 3.4 in the Calipatria area of Southern California. It was followed by a series of at least 10 light events of M 2-3 and felt in the Calipatria area and in surrounding communities with light intensity. It may have been promoted by tidal stresses as it occurred within a few minutes of local solar midnight, a prime time for maximum tidal stresses. This is the strongest earthquake within about 50 km of this epicenter since an M 3.6 on June 17, 2018. The last event in the area of significantly larger magnitude was an M 3.7 on May 13, 2018. Forecast 112825 had expected this activity in southern California was likely in mid-January. This region is located at 108 degrees from the  Mindanao quake of December 29, 2018 and may indicate an area where triggering in Southern California may occur in later January (most likely around January 28 through early February).

 

O: 19JAN2019 05:20:56  33.1N  115.6W ml=2.2  ANSS   WNW of Calipatria CA

O: 18JAN2019 16:47:40  33.1N  115.6W ml=2.4  ANSS   WNW of Calipatria CA

O: 18JAN2019 08:19:15  33.1N  115.6W ml=3.4  ANSS   WNW of Calipatria CA

O: 18JAN2019 07:54:40  33.2N  115.6W ml=2.2  ANSS   WNW of Calipatria CA

O: 18JAN2019 07:54:55  33.2N  115.6W ml=2.2  ANSS   WNW of Calipatria CA

O: 18JAN2019 07:10:10  33.2N  115.6W ml=2.4  ANSS   WNW of Calipatria CA

O: 18JAN2019 07:54:07  33.2N  115.6W ml=2.5  ANSS   WNW of Calipatria CA

O: 18JAN2019 10:55:07  33.1N  115.6W ml=2.1  ANSS   WNW of Calipatria CA         

P: 15JAN2019 112825    32.9N  116.4W 2.5-4.6 BAAAA  So. California             

 

EASTERN HONSHU, JAPAN HAS THE SHAKES

 

EARTHQUAKE SUMMARY FOR JANUARY 13, 2019

 

An M 5.1 earthquake was felt widely with moderate intensity in southeastern Honshu, Japan today.  NEIC reported maximum intensity V in Tochigi with IV felt in Ibaraki, Saitama, Gunma, and lesser shaking in Chiba and Tokyo, Japan.

This event was followed later in the day by an M 5.0 off the east coast of

Honshu, Japan.  NEIC reported this earthquake of M 4.8 off eastern Honshu, Japan  was felt with intensity II-III in the area(s) of Miyagi, Japan. The last earthquake within about 100 km of the event of M 5.1 in Eastern Honshu was an M 5.4 on October 20, 2016. There have been other events of this size in the intervening time but they all occurred about 100 km to the east of today's epicenter. This activity had been expected in forecast 122614 and 122632 in early to mid-January.

 

O: 14JAN2019 04:23:42  36.2N  139.8E mb=5.1  EMSC   EASTERN HONSHU, JAPAN        

P:  9JAN2019 122614    38.0N  141.0E 4.0-5.6 BBAAA  Off East Coast Honshu      

 

O: 13JAN2019 12:14:44  37.3N  141.3E mb=5.0  EMSC   NEAR EAST COAST OF HONSHU, JAP

P:  7JAN2019 122632    38.0N  143.0E 4.0-5.5 CABAA  So. of Honshu              

 

The strongest earthquake in the U.S. or Canada today was an M 5.0 in the Anchorage, Alaska aftershock zone. This is the strongest aftershock of M 7.1 of November 30, 2018 since a similar M 5.0 on January 1, 2019. NEIC reported today's event was widely felt with moderate intensity V in Anchorage, Elmendoft AFB, Fort Richardson, and IV in Willow, Eagle River, Chugiak, Girdwood, Moose Pass, Palmer, and in geral within about 150 km of the epicenter. Forecast 122706 had expected today's event was likely around January 10 in the aftershock zone.

 

O: 13JAN2019 16:45:53  61.3N  150.1W Mw=5.0  EMSC   SOUTHERN ALASKA              

O: 14JAN2019 01:06:58  61.4N  150.1W ML=3.1  EMSC   SOUTHERN ALASKA              

P: 10JAN2019 122706    61.2N  151.2W 3.2-5.0 BAAAA  Central Alaska             

 

Two other  moderate earthquakes were also located in Alaska today  - an M 4.8 in the northern aftershock zone and an M 4.4 in the central Andreanof Islands. These were not unusual and had been forecast 122713 and 122683.

 

O: 14JAN2019 00:41:19  69.7N  145.0W mb=4.8  EMSC   NORTHERN ALASKA              

P:  9JAN2019 122713    69.0N  144.0W 3.0-4.8 BAAAA  Northern Alaska            

 

O: 13JAN2019 20:48:17  51.7N  177.6W mb=4.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  9JAN2019 122683    50.7N  179.5W 3.5-4.9 BABAA  Andreanoff Isls, Aleutians 

 

The strongest earthquake in the U.S. outside Alaska today was an M 4.1 off the coast of Northern California. The last earthquake of M>=4.1 within about 50 km of this epicenter occurred as an M 4.1 on October 8, 2018. The last with larger magnitude was am M 4.5 half a year ago  on July 25, 2018. Forecast 122665 had expected this activity around January 9.

 

 

O: 13JAN2019 09:35:48  40.3N  125.0W Mw=4.1  EMSC   OFFSHORE NORTHERN CALIFORNIA 

P:  9JAN2019 122665    40.3N  127.2W 2.5-4.5 BABAA  Off Coast of No. Calif     

 

An unusual earthquake of M 2.7 also hit in the Texas Panhandle region today.

NEIC reported this earthquake of M 2.7 in Texas was felt with intensity II-III in the area(s) of Mobeetle, Texas. It is the strongest within about 100 km since an 2.7 on December 26, 2015. A moderate quake shook the area abpit 150 km west of this on October 20, 2018. Forecast 122344 had expected regional seismicity in late December or early January.

 

O: 13JAN2019 20:58:38  35.5N  100.2W mb=2.7  EMSC   TEXAS PANHANDLE REGION       

P: 29DEC2018 122344    35.4N  101.8W 2.0-4.3 DAAAA  SW U.S.A                   

 

The strongest earthquake in the world today was an M 5.3 in the Solomon Islands where it was not reported felt. This is the strongest earthquake within about 150 km of this epicenter since an M 5.4 on December 27, 2018 and prior to that an M 5.3 on October 3, 2018. A stong M 6.5 hit the area on September 9, 2018 and this may be aftershokc activity following that event. Forecast 122724 had expected this activity was likely in early January.

 

O: 13JAN2019 12:40:14  10.1S  161.4E mb=5.3  EMSC   SOLOMON ISLANDS              

P:  4JAN2019 122724    10.0S  160.0E 4.0-5.6 CABAA  No. of Santa Cruz Islands  

 

 

 

 

GLOBAL SEISMICITY QUIET

 

EARTHQUAKE SUMMARY FOR JANUARY 12, 2019

 

Global seismicity was at quiet levels today. Despite an M 5.0 and 5.1 near Sumatra, Indonesia, and an M 5.4 in New Britain, little noteworthy seismicity occurred.  Triggering agents  are absent - no geomagnetic storm, low tides (7th day in lunar lycle); and  no tropical cyclones probably are contributing to this lull in seismicity.

 

The strongest earthquake in the U.S. or Canada today was an M 4.2 in the aftershock zone in Northern Alaska. It was accompanied by events of M 3.4, 3.1 and 3.0. This is a remote area and these events were not reported felt. Earthquakes of M>=4.2 have more recently occurred in this area with M 4.5 each on January 9, 2019 and December 30, 2018. Forecast 122713 had expected today's activit was likely around January 9.

 

O: 12JAN2019 21:00:36  69.2N  144.5W ML=3.0  EMSC   NORTHERN ALASKA              

O: 12JAN2019 17:14:05  69.2N  144.6W ML=4.2  EMSC   NORTHERN ALASKA              

O: 12JAN2019 18:30:30  69.2N  144.7W ml=3.1  EMSC   NORTHERN ALASKA              

O: 13JAN2019 06:45:31  69.2N  144.7W ml=3.4  EMSC   NORTHERN ALASKA              

P:  9JAN2019 122713    69.0N  144.0W 3.0-4.8 BAAAA  Northern Alaska            

 

 

Enhanced seismicity, as discussed in the previous issue of this summary,  in the valleys west of Los Angeles, California continued today. The most notable of these events was an M 3.0 near Northridge, California. NEIC reported this earthquake of M 3.0 in Southern California was felt with intensity II-III in the area(s) of Northridge, North Hill, Van Nuis, Reseda, Encino and others in the Northridge area. The last aftershock of M>=3 in the Northridge area occurred more than a year ago with in M 3.1 on December 8, 2017. Forecast 122626 had expected today's aftershock was likely around January 9.

 

O: 12JAN2019 18:38:48  34.2N  118.5W ML=3.0  EMSC   GREATER LOS ANGELES AREA, CALI

P:  9JAN2019 122626    34.4N  118.6W 2.5-4.5 BAAAA  So. California             

 

Mid-January has been an active eeismic period in recent years. Among others, this has seen major earthquake in Pakista/India in 2001; Mexico in 2003 and in Puerto Rico and Haiti, It is expected that this trend will continue this year despite a slow start.

 

The strongest earthquake in the world today was an M 5.4 in the New Britain area of PNG. It was not reported felt in this remote area. This is an active area but the last event of M>=5.4 within about 200 km of this epicenter occurred December 21, 2018, a long time for this region. Forecast 122528 had expected this event was likely around January 10.

 

O: 12JAN2019 17:13:17   5.8S  152.2E mb=5.4  EMSC   NEW BRITAIN REGION, P.N.G.   

P: 10JAN2019 122528     6.0S  151.0E 4.0-5.6 AAAAA  New Ireland                

 

LOS ANGELES, CALIFORNIA SEES SEISMIC ENHANCEMENT

 

EARTHQUAKE SUMMARY FOR JANUARY  11, 2019

 

A series of light foreshocks? hit in the region of Los Angeles, California. The epicenters were not localized to a sincgle area but spread across the region. In many ways this resembles the foreshokc activity in January 1994 prior to the M 6.7 Northridge earthquake west of Los Angeles where at least one of today's events was located with M 2.5. Earthquakes of M 3.1, 2.2 and 2.8 among others also occurred today in the Los Angeles Region. The months of January and February are often active periods in this area of Los Angeles. The may be due to tropical cyclone season at the antipode in the South Indian Ocean or more local causes. This summary has previously noted the occurrence of a Northridege or San Fernando Valley quake approximately 22-23 years apart and such an event is overdue. An M 5.3 April 5, 2018 outh of Los Angeles may have released some of the stress but not all. The April, 2018 event remains the strongest in the valleys west of Los Angeles since immediate aftershocks of he January 17, 1994 Northridge earthquake. An M 5.3-5.4 quake hit eastern Los Angeles on July 29, 2008, the only other regionally comparable event since Northridge. The event was located near the epicenter of ht M 3.1 today. The area is located near but not at 103 degrees from the Mindanao quake of M 7.0 on December 29, 2018 and the series in the Molucca Sea of early January, 2019. Energy from these events may be stirring the pot in California at this time.

 

Forecasts 122624-122626 and 122592 had expected the area would be active in early January. The last earthquake in Los Angeles of M>=3.1 was an M 3.1 on October 12, 2018. The last of larger magnitude was an M 4.4 and M 3.4 aftershock about 25 km north of today's epicenter on August 29, 2018.

 

NEIC reported this earthquake of M 3.1 in Yorba Linda, California was felt with intensity II-III in the area(s) of Brea, Yorba Linda, Placentia, China Hills, Diamond Bar, Anaheim, among others in California.

 

O: 11JAN2019 21:19:05  33.9N  117.8W ML=3.1  EMSC   GREATER LOS ANGELES AREA, CALI

P:  9JAN2019 122624    34.2N  117.8W 2.5-4.4 AAAAA  So. California             

 

NEIC reported the earthquake of M  2.5 in  Santa Monica, California was felt with intensity II-III in the area(s) of Sana Monica, Los Angeles and Venice, Calirornia, among others.

 

O: 12JAN2019 01:07:54  34.0N  118.5W Ml=2.5  EMSC   GREATER LOS ANGELES AREA, CALI

P:  9JAN2019 122626    34.4N  118.6W 2.5-4.5 BAAAA  So. California              

P: 11JAN2019 122624    34.0N  118.7W 2.5-4.4 AAAAA  So. California             

 

O: 11JAN2019 13:04:07  34.9N  120.4W Ml=2.2  EMSC   CENTRAL CALIFORNIA           

P:  7JAN2019 122592    36.6N  120.7W 2.5-4.4 BBAAA  Central California         

 

O: 11JAN2019 17:43:08  35.1N  119.0W Ml=2.8  EMSC   CENTRAL CALIFORNIA           

P:  8JAN2019 122626    35.0N  119.2W 2.5-4.4 BAAAA  So. California             

 

The strongest earthquake in the U.S. or Canada today was na M 4.0 in the aftershock zone of Anchorage, Alaska where an M 7.1 stuck on November 30. Earthquake of M>=4 are nearly a daily occurrence at this point in the aftershock cycle and generally do no damage. Forecast 122706 had expected this activity around January 9.

 

O: 11JAN2019 15:56:29  61.4N  150.0W mb=4.0  EMSC   SOUTHERN ALASKA              

P:  9JAN2019 122706    61.3N  150.9W 3.2-4.9 AAAAA  Central Alaska             

 

The strongest earthquake in the world today was an M 5.4 in Southern Sumatra, Indonesia. This epicenter is located near the site of a trong tsunami in late December which  was probably generated by an ruption of Krakatu. Further such activity could lead to another such tsunami. Forecast 122539 expected this activity in early January.

 

O: 11JAN2019 19:05:30   3.3S  101.4E Mw=5.4  EMSC   SOUTHERN SUMATRA, INDONESIA  

P:  7JAN2019 122537     5.0S  102.0E 4.0-5.4 BBAAA  So. of Sumatera            

 

NORTHERM KERMADEC ISLANDS ACTIVE

 

EARTHQUAKE SUMMARY FOR JANUARY  10, 2019

 

The strongest earthquake in the world today was an M 5.8 in the Kermadec Islands of northern New Zealand. It was accomopanied by regional activity of M 4.9, 4.9 a dn 4.9 in the Kermadec Islands and an M 4.7 in Southern Tonga. When an M 5.2 hit the southern Kermadec Islands yesterday this reported noted:

 

"The strongest earthquake in the world today was an M 5.2 in the Kermadec Islands of northern New Zealand. This is a remote area and this event was not reported felt in the region. The region of the Kermadec Islands is generally active and events of M 5.2 or greater are not uncommon. One of the few populated areas in the region is the seismic station on Raoul Island. The last event within about 150 km of today's epicenter with M>=5.2 was an M 5.6 on November 25, 2018. The last of significantly larger size was an M 5.9 on July 7, 2018." (January 10, 2019)

 

Today's activity may have been promoted by Tropical Cyclone Mona as the remnants of that storm passed to the north as noted in earlier summaries:

 

"Tropical cyclone Mona continued in the southwest Pacific north of Samoa today with winds up to 50 kts. It is expected to track to the south reaching Samoa around January 6. Enhanced seismicity in the area is likely over the next five days." (January 7, 2019)

 

The last earthquake within about 200 km of today's M 5.8 with that magnitude or larger occurred on July 2, 2017 also with M 5.2 and prior to that on August 12, 2016 with M 6.1. Forecast 122739 had expected today's event was likely around January 10 within about 100 km of this epicenter. These earthquake area at 99-100 degrees from the earthquake deep under Brazil which occurred on January 5, 2018 with M 6.8. It was expected at this distance at the time as:

 

 

"Deep quakes such as the under Brazil can trigger far-field seismicity. But is is slightly different than that from shallow events. In general maximum concentration of energy on the surface from deep focus events occurs not around 103 degrees but around 100 degrees (or at 106 degrees due to a surface reflection near the epicenter) from the mainshock. This is the distance where maximum seismic enhancement is expected with events such as today's under Brazil." (January 5-6, 2019)

 

An earthquake of M 4.9 in Crete was also located today at 100 degrees from Brazil.

 

O: 10JAN2019 18:24:37  34.4N   26.6E mb=4.9  EMSC   CRETE, GREECE                

P:  8JAN2019 122599    34.0N   26.0E 3.0-4.7 AAAAA  Crete                      

 

O: 10JAN2019 17:00:39  27.1S  175.5W Mw=5.8  EMSC   KERMADEC ISLANDS REGION      

O: 10JAN2019 17:11:58  27.2S  176.1W mb=4.9  EMSC   KERMADEC ISLANDS REGION      

P: 10JAN2019 122739    28.0S  176.0W 4.0-5.6 AAAAA  No. Kermadec Islands       

 

O: 10JAN2019 19:26:09  30.6S  175.1W mb=4.9  EMSC   KERMADEC ISLANDS REGION      

P:  7JAN2019 122739    29.0S  176.0W 4.0-5.5 BBAAA  No. Kermadec Islands       

P:  8JAN2019 122756    31.0S  179.0W 4.0-5.6 AACAA  So. Kermadec Islands       

 

O: 11JAN2019 02:03:59  26.9S  176.1W mb=4.7  EMSC   SOUTH OF FIJI ISLANDS        

P: 10JAN2019 122739    28.0S  176.0W 4.0-5.6 ABAAA  No. Kermadec Islands       

 

A light earthquake of M 3.8 was felt in Saint John area of New Brunswick, Canada today. NEIC reported it was felt with intensity II-III in New Brunswick at Saint John, Hampton, Fredericton, Campbellton, Digby, Nova Scotia, and perhaps as far as Massachusetts and Quebec, This is the strongest earthquake within about 200 km of this epicenter in New Brunswick since an M 4.0 on July 15, 1998. Similar events occurred on May 6, 1995 (M 3.9) and July 14, 1994. No such earthquakes have occurred within about 150 km of today's epicenter in at least 30 years.  Forecast 122645 had expected today' event within about 50 km of the epicenter was likely around January 7. This epicenter is at the fifth node (72 degrees) from the M 7.3 in  the Komandorsky Islands of December 20 and was probably promoted from that source. This was also true of the M 3.8 in Mississippi yesterday, also the strongest in that area in at least 30 years as noted in the previous issue of this summary:

 

O: 10JAN2019 13:48:59  45.4N   66.3W mb=3.8  EMSC   NEW BRUNSWICK, CANADA        

O: 10JAN2019 13:49:00  45.4N   66.2W ML=3.8  NRCA  20 km NW from Saint John

P:  7JAN2019 122645    46.0N   66.0W 2.0-4.3 BAAAA  E. of Maine                

 

The strongest earthquake in the U.S. or Canada today was an M 4.7 in the Anchorage aftershock zone in Alaska. The last aftershock of the K 7.1 in Anchorage of November 30 with M>=4.7  occurred on January 1, 2019 with M 5.0.  Forecast 122706 expected today's event was likely around January 9.

 

O: 11JAN2019 02:33:37  61.5N  149.9W mb=4.7  EMSC   SOUTHERN ALASKA              

P:  9JAN2019 122706    61.3N  150.9W 3.2-4.9 AAAAA  Central Alaska             

ST

MODERATE QUAKE RECORDED IN KERMADEC ISLANDS

 

EARTHQUAKE SUMMARY FOR JANUARY  9, 2019

 

The strongest earthquake in the world today was an M 5.2 in the Kermadec Islands of northern New Zealand. This is a remote area and this event was not reported felt in the region. The region of the Kermadec Islands is generally active and events of M 5.2 or greater are not uncommon One of the few populated areas in the region is the seismic station on Raoul Island. The last event within about 150 km of today's epicenter with M>=5.2 was an M 5.6 on November 25, 2018. The last of significantly larger size was an M 5.9 on July 7, 2018. Forecast 122756 had expected today's event was likely around January 8.

 

O: 10JAN2019 04:54:19  30.2S  176.2W mb=5.2  EMSC   KERMADEC ISLANDS REGION      

P:  8JAN2019 122756    31.0S  179.0W 4.0-5.6 AABAA  So. Kermadec Islands       

 

The strongest earthquakes in the U.S. or Canada today occurred in Southern Alaska with M 4.4 An M 4.4 first occurred in the Kenai Peninsula about 200 km southwest of Anchorage and was followed later in the day by an M 4.4 in the Anchorage, Alaska aftershock zone of the November 30, 2018 M 7.1 mainshock. Moderate aftershock are nearly a daily occurrence in the Anchorage area. The last of M>=4.4 was an M 5.0 on January 1, 2019. Forecast 122706 had expected enhanced aftershocks in the area around January 9-10.

 

NEIC reported this earthquake of M 4.4 in Southern Alaska was felt with intensity IV-V in Wasilla, Willow, Anchorage, Alaska and II-III in the area(s) of Elmendorf AFB, Fort Richardson, Alaska.

 

O:  9JAN2019 10:57:41  61.4N  149.9W ML=3.7  EMSC   SOUTHERN ALASKA              

O: 10JAN2019 00:49:27  61.5N  150.0W ML=3.0  EMSC   SOUTHERN ALASKA              

O: 10JAN2019 00:04:31  61.5N  150.0W mb=4.4  EMSC   SOUTHERN ALASKA              

P:  9JAN2019 122706    61.3N  150.9W 3.2-4.9 AAAAA  Central Alaska             

P: 10JAN2019 122706    61.2N  151.2W 3.2-5.0 AAAAA  Central Alaska             

 

The earthquake of M 4.4 in the Kenai Peninsula was a bit less common that the event near Anchorage and was not part of the local aftershock series. The last earthquake in the Kenai Peninsula area with M>=4.4 within about 100 km of today's epicenter occurred on November 17, 2017 with M 4.4. Forecast 122706 had expected today's event was likely around January 10.

 

NEIC reported this earthquake of M 4.5 in Southern Alaska was felt with intensity II-III in the area(s) of Soldotna, Ninichik, Sterling, Anchor Point, Kenai, Homer, Seward, and Anchorage.

 

O:  9JAN2019 16:11:30  60.2N  151.0W Mw=4.4  EMSC   KENAI PENINSULA, ALASKA      

P: 10JAN2019 122706    61.2N  151.2W 3.2-5.0 AAAAA  Central Alaska             

 

RONG QUAKE RATTLES KYUSHU, JAPAN

 

EARTHQUAKE SUMMARY FOR JANUARY  8, 2019

 

The strongest earthquake in the world today was an M 6.3 in Kyushu, Japan. NEIC reported maximum intensity IV in Oita, Japan with lesser shaking in Kagoshima, Miyasaki, Oita and Okinawa, Japan. No major damage or tsunami was associated with this earthquake. A tsunami watch was lifted about an hour after the quake when no tsunami was observed. JMA gave intensity V in Fukuoka, Nagasaki and Kumamoto in the the southwest Kyushu. A series of damaging quakes hit Kyushu in 2016. These damaged a local castle as well as leaving nine dead an over 800 injured. Homes and infrastructure was also damaged in those earthquakes. The last earthquake of M>=6.3 within about 200 km of today's epicenter was an M 6.8 about 200 km southwest of this in the Ryukyu Islands on October 30, 2009. The last within about 150 km of today's epicenter was an M 6.4 on January 24, 1999. Forecasts 122603 and 122575 had expected this activity in Kyushu in early January.

 

O:  8JAN2019 12:39:29  30.6N  131.1E Mw=6.3  EMSC   KYUSHU, JAPAN                

P:  3JAN2019 122603    30.0N  131.0E 3.5-4.9 BAAAA  Kyushu, Japan area         

P: 11JAN2019 122575    29.0N  130.0E 4.0-5.4 BBAAA  Kyushu Japan               

 

An unusual earthquake of M 3.7 along the border of Misissippi and Arkansas today was the strongest in the U.S. or Canada. NEIC reported it was felt with light intensity II-III in Mississippi at Hollandale, Greenville, Wayside, Anguilla, Glen Allan, Leland, Isola, Greenville, and in Eudora, Arkansas among others.

This is the strongest earthquake within about 100 km of this epicenter in at least 30 years. The largest event in the area since 1990 was an M 3.6 on August 11, 1006 and the last of M>=3 was an M 3.2 on June 29, 2015. Forecast 122606 expected activity in this area around January 11.

 

O:  8JAN2019 22:26:33  33.2N   90.9W Mw=3.7  EMSC   MISSISSIPPI                  

O: 08JAN2019 22:26:33  33.2N   90.9W mw=3.7  ANSS   9km NW of Hollandale

P: 11JAN2019 122606    35.0N   89.0W 2.0-4.0 BBBAA  New Madrid area            

 

The strongest earthquake in the U.S. or Canada today was an M 4.5 in the region of Northern Alaska where a series of moderate to strong quakes began August 12, 2018. The last earthquake with M 4.5 in the area was an M 4.5 on December 30, 2018 while the last of larger magnitude occurred on December 18, 2018. Forecast 122713 had expected today's event was likely around January 9.

 

O:  9JAN2019 06:51:40  69.2N  144.6W ml=4.5  ANSS   Northern Alaska               

P:  9JAN2019 122713    69.0N  144.0W 3.0-4.8 AAAAA  Northern Alaska            

 

The eruption of Mt. Etna, Sicily, Italy continued today with M 4.1. This area has been quiet in recent days following a strong eruption at the end of December, 2018. The last event in the sequence of M>=4 was an 5.1 on December 26, 2018. Forecast 122604 had expected today's activity was likely between January 7 and 11.

 

O:  8JAN2019 23:50:34  37.8N   15.1E ML=4.1  EMSC   SICILY, ITALY                

P:  7JAN2019 122604    39.0N   15.0E 3.0-4.7 ABAAA  Mediterranean/Sicily       

P: 11JAN2019 122604    38.0N   15.0E 3.0-4.7 BAAAA  Mediterranean/Sicily       

 

MODERATE QUAKES CONTINUE IN SOUTHERN PHILIPPINES/INDONESIA

 

EARTHQUAKE SUMMARY FOR JANUARY  7, 2019

 

Moderately strong earthquakes continued today in the region of the Molucca Sea and western Mindanao, Philippines with M 5.4-5.5. These may reflect continuing

influence on regional seismicity from the M 7.0 in Mindanao of December 29; the passage of Tropical Cyclone Pabuk through the region; a strong geomagnetic storm and tidal effects from the new moon of January 6.

 

A moderately large M 5.5 also occurred today in the region of Mindanao, Philippines. PHIVOLCS reported it was felt with intensity V in Socon, Zamboanga del Norte; IV in Zamboanga City; Liloy, Zamboanda del Norte; III in Sindangan and Labason, Zamboanga del Norte and II in Dipolog City; Manukan, Zamboanga del Norte, Philippines. NEIC reported this earthquake of M 5.5 in Mindanao, Philippines was felt with intensity II-III in the area(s) of Zamboanga, Western Mindanao, Philippines. This is not a classic aftershock of the M 7.0 in Mindanao on December 29. That shock hit about 500 km to the southeast of this epicenter.  It was probably enhanced by regional stress redistribution following the M 7.0 in southern Mindanao. An M6.0 hit about 200 km to the east of this at a deep epicenter on November 4, but appears to have had little relation to today's earthquake. The last event in the region within about 200 km of today's epicenter at a shallow focus was an M 5.9 on April 13, 2015 and prior to that an M 6.1 on December 29, 2014. Forecast 122225 had expected activity in this area of the Philippines was likely near the beginning of 2019. This event occurred within about a half hour of local solar noon and was probably promoted by tidal stresses. This summary had noted in previous issues in this regard:

 

"The new moon will arrive at 01:28  UT on January 6, 2019. Longitudes that are sub-lunar at this time are near 22 West while those which are sub-solar are near 158 East longitude. These include the mid-Atlantic, South Sandwich Islands and Iceland in the west and Kamchatka, Komandorsky Islands, Kurils, the Solomon and Vanuatu among others. These areas will experience the strongest tidal stresses associated with the new moon and could see a triggered strong earthquake in the next week. Other areas will also see tidal stresses and could see increased seismicity at this time." (January 2-5, 2019)

 

O: 07JAN2019 03:11:51  07.9N  121.8E MS=5.4  PHI  Felt with intensity V

O:  7JAN2019 03:11:56   7.9N  122.0E Mw=5.5  EMSC   MINDANAO, PHILIPPINES        

P:  1JAN2019 122225     7.0N  124.0E 4.0-5.4 CABAA  Central Philippines        

 

The second strongest earthquake in the world today was an M 5.4 aftershock  following yesterday's M 6.6 in the Molucca Sea, Indonesia. Four moderate aftershocks occurred in the Molucca Sea today. In regard to the mainshock of M 6.6 this summary - in the previous issue - noted:

 

"A strong earthquake of M 6.6 hit the Molucca Sea region of Indonesia today. NEIC reported it was felt lightly in Manado, Sulawesi, Indonesia. This is part of the antipodal activity involving Tropical Cyclone Pabuk. Pabuk passed over Mindanao, Philippines 10 days ago helping to trigger an M 7.0 in  Mindanao, on December 29. As it continued to the west it made landfall at the antipode of the M 6.8 earthquake which followed beneath Brazil. The Molucca Sea activity followed that event and is in the antipodal area of Brazil. This seismic ping-pong can continue for some time but will gradually die out.  At least 20 moderte aftershocks followed the M 6.6 in the Molucca Sea today but as this is a remote area no major damage was reported. The last earthquake located within about 200 km of today's M 6.6 with larger magnitude occurred on December 21, 2014 with M 6.6, an aftershock of an M 7.1 on November 15, 2014." (January 6-7, 2019)

 

O:  7JAN2019 14:40:03   2.2N  126.8E mb=4.8  EMSC   MOLUCCA SEA                  

O:  7JAN2019 07:36:43   2.3N  126.8E ML=3.7  EMSC   MOLUCCA SEA                  

O:  7JAN2019 07:20:42   2.3N  126.9E mb=4.7  EMSC   MOLUCCA SEA                  

O:  7JAN2019 14:11:48   2.5N  126.8E mb=5.4  EMSC   MOLUCCA SEA                  

P:  6JAN2019 122514     3.0N  127.0E 4.0-5.9 AAAAA  Halmahera                  

 

 

A moderate earthquake of M 5.2 also continued enhanced seismicity in the region of Tarapaca, Chile. An M 6.2 hit this epicenter on November 1, 2018. This may be the strongest aftershock to date of that event. Forecast 122728 expected today's epicenter would be active around January 9.

 

GUC reported this earthquake was felt with intensity  IV in  Arica at Codpa, Cuya and II in Arica; IV in Tarapaca at Mamina; III in Alto Hospicio, Iquique, Pica and Pozo Qlmont3 qne II in Dqminq, Dhil3. NEIC reported this earthquake of M 5.0 in Iquique, Chile was felt with intensity II-III in the area(s) of Iquique, Tarapaca, Chile.

 

O:  7JAN2019 13:43:29  19.7S   69.0W mb=5.2  EMSC   TARAPACA, CHILE              

O:  7JAN2019 13:43     19.8S   69.1W mb=5.0  GUC    Arica at Codpa, Cuya and II in

P:  9JAN2019 122728    19.0S   69.0W 4.0-6.1 AAAAA  So. Peru/Bolivia           

 

STRONG QUAKE IN THE MOLUCCA SEA, INDONESIA; AFTERSHOCK DAMAGE IN IRAN/IRAQ

 

EARTHQUAKE SUMMARY FOR JANUARY  6, 2019

 

A strong earthquake of M 6.6 hit the Molucca Sea region of Indonesia today. NEIC reported it was felt lightly in Manado, Sulawesi, Indonesia. This is part of the antipodal activity involving Tropical Cyclone Pabuk. Pabuk passed over Mindanao, Philippines 10 days ago helping to trigger an M 7.0 in  Mindanao, on December 29. As it continued to the west it made landfall at the antipode of the M 6.8 earthquake which followed beneath Brazil. The Molucca Sea activity followed that event and is in the antipodal area of Brazil. This seismic ping-pong can continue for some time but will gradually die out.  At least 20 moderate aftershocks followed the M 6.6 in the Molucca Sea today but as this is a remote area no major damage was reported. The last earthquake located within about 200 km of today's M 6.6 with larger magnitude occurred on December 21, 2014 with M 6.6, an aftershock of an M 71. on November 15, 2014. Forecast 122514 had expected today's event was likely around January 6. These events also lie at the third node (120 degrees) from the South Sandwich event of M 7.1 of December 11, 2018 and may have been been promoted from that source.

 

O: 06JAN2019 11:26:08   1.3N  125.8E ML=3.9  EMSC   MOLUCCA SEA

O: 06JAN2019 18:14:34   2.2N  126.7E mb=4.7  EMSC   MOLUCCA SEA

O: 06JAN2019 18:18:10   2.2N  126.7E mb=5.1  EMSC   MOLUCCA SEA

O: 06JAN2019 23:02:05   2.3N  126.7E ML=4.0  EMSC   MOLUCCA SEA

O: 07JAN2019 00:09:06   2.3N  126.7E ML=4.0  EMSC   MOLUCCA SEA

O: 06JAN2019 18:35:36   2.3N  126.7E mb=4.7  EMSC   MOLUCCA SEA

O: 06JAN2019 18:43:26   2.3N  126.8E ML=3.7  EMSC   MOLUCCA SEA

O: 06JAN2019 23:55:22   2.3N  126.8E ML=4.0  EMSC   MOLUCCA SEA

O: 07JAN2019 01:37:18   2.3N  126.8E ML=4.0  EMSC   MOLUCCA SEA

O: 06JAN2019 17:27:18   2.3N  126.8E Mw=6.6  EMSC   MOLUCCA SEA

O: 06JAN2019 20:23:54   2.3N  126.8E mb=4.5  EMSC   MOLUCCA SEA

O: 06JAN2019 17:57:23   2.3N  126.8E mb=4.7  EMSC   MOLUCCA SEA

O: 06JAN2019 21:33:00   2.3N  126.8E mb=4.9  EMSC   MOLUCCA SEA

O: 06JAN2019 18:25:30   2.3N  126.9E mb=5.1  EMSC   MOLUCCA SEA

O: 06JAN2019 18:12:09   2.3N  127.0E mb=4.4  EMSC   MOLUCCA SEA

O: 06JAN2019 20:31:42   2.3N  127.2E mb=4.6  EMSC   MOLUCCA SEA

O: 06JAN2019 21:27:30   2.4N  126.7E mb=4.7  EMSC   MOLUCCA SEA

O: 06JAN2019 18:44:28   2.4N  126.8E ML=4.0  EMSC   MOLUCCA SEA

O: 06JAN2019 17:42:33   2.4N  126.8E ML=4.2  EMSC   MOLUCCA SEA

O: 06JAN2019 18:23:48   2.4N  126.8E ML=4.3  EMSC   MOLUCCA SEA

O: 06JAN2019 18:01:42   2.4N  126.8E mb=4.9  EMSC   MOLUCCA SEA

O: 06JAN2019 20:06:29   2.4N  126.8E mb=4.9  EMSC   MOLUCCA SEA

O: 06JAN2019 19:16:02   2.4N  126.8E mb=5.0  EMSC   MOLUCCA SEA

O: 07JAN2019 04:12:13   2.4N  126.9E mb=4.4  EMSC   MOLUCCA SEA

O: 06JAN2019 21:07:32   2.4N  126.9E mb=4.5  EMSC   MOLUCCA SEA

O: 07JAN2019 04:03:21   2.4N  126.9E mb=4.5  EMSC   MOLUCCA SEA

O: 06JAN2019 19:12:24   2.5N  126.8E ML=4.0  EMSC   MOLUCCA SEA

O: 06JAN2019 19:54:51   2.5N  126.8E ML=4.0  EMSC   MOLUCCA SEA

O: 06JAN2019 19:00:37   2.5N  126.8E ML=4.1  EMSC   MOLUCCA SEA

O: 06JAN2019 18:57:48   2.5N  126.8E ML=4.2  EMSC   MOLUCCA SEA

O:  6JAN2019 21:24:02   2.6N  127.1E mb=4.4  EMSC   MOLUCCA SEA                  

P:  6JAN2019 122514     3.0N  127.0E 4.0-5.9 AAAAA  Halmahera                  

 

 

A moderately strong earthquake of M 5.6 was also felt along the Iran-Iraq border today with some damage reported. NEIC reported intensity up to IV inIraq at Khalis Diyala, ad-Dujal, Balad, Bagdad and in Iran at Eilam Ilam, Bakhtaran, Aslamabad and other communities within about 200 km of the epicenter. An aftershock of M 4.9 was felt in Baghdad with intensity V and in Sannandaj, Iran with intensity II. Local Medical personel reported at least 75 were injured in the quake, most  with light injuries. The quake damaged some farms and residential buildings and cause several landslides affecting drinking water in Gilan Gharb, Iran. It is part of a series of events that have damaged this area in the past months. The strongest of these was an M 7.3 on November 12, 2017. The last strong aftershock was an M 6.3 on November 25, 2018.  Forecast 122609 had expected today's event was likely within about 50 km around January 6.

 

O: 06JAN2019 13:41:57  34.0N   45.6E Mw=5.6  EMSC   IRAN-IRAQ BORDER REGION

O: 06JAN2019 14:15:07  34.0N   45.7E ML=4.7  EMSC   IRAN-IRAQ BORDER REGION

O: 06JAN2019 13:46:49  34.2N   45.6E ML=4.1  EMSC   IRAN-IRAQ BORDER REGION

O:  6JAN2019 14:29:24  34.0N   45.5E ML=4.1  EMSC   IRAN-IRAQ BORDER REGION      

P:  6JAN2019 122609    34.0N   45.0E 3.8-5.4 AAAAA  No. Iran                   

 

The strongest earthquake in the U.S. or Canada today was an M 5.0 aftershock of the M 6.1 quake yesterday in the Andreanof Islands, Aleutians, Alaska. It was not reported felt in this remote area. Forecast 122683 had expected a moderate quake in this region around January 5.

 

O:  7JAN2019 00:25:05  51.2N  178.2W mb=4.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

O:  6JAN2019 07:25:41  51.4N  178.2W mb=5.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P:  5JAN2019 122683    51.8N  178.0W 3.5-4.9 AAAAA  Andreanoff Isls, Aleutians 

 

TRONG EARTHQUAKE UNDER BRAZIL FOLLOWED BY M 6.1 IN ALEUTIANS, ALASKA

 

EARTHQUAKE SUMMARY FOR JANUARY  5, 2019

 

Moderately strong to strong earthquakes hit three areas today as the new moon tidal alignment occurred. An M 6.8 at a focus near 600 km depth occurred beneath Brazil and was followed shortly by an M 6.0-6.1 in the Andreanof Islands, Alaska.  An M 5.8 then occurred in the Volcano Islands of Japan.

 

The strongest earthquake in the world today was the M 6.8 at a deep focus beneath Acre, Brazil. NEIC reported intensity II-III in Brazil at Porto Velho Rondonia and in Quito, Ecuador as well as in central Peru at Pucallpa, Huancuco and Lima.  The earthquake under Brazil was probably triggered by a combination of stresses from the tidal stresses associated with the new moon tidal alignment which  occurred today and by stresses associated with the current geomagnetic  storm. This epicenter is located in an area (at or near the geomagnetic equator at great depth and near the Atlantic) where stresses from these two were expected to maximize at this time as noted in previous issues of this summary:

 

"The geomagnetic field saw quiet conditions today. The AP level was 9. High latitude geomagnetic field saw unsettled  conditions  with AP at 11. This appears to conclude the strongest geomagnetic storm in at least a month - since it reached 35 on November 5, 2018. Areas near the geomagnetic equator and at high latitudes are expected to see enhanced seismicity with this storm with the possibility of a strong to major earthquake in the period through January 7, 2019." (January 3-5, 2019)

 

"The new moon will arrive at 01:28  UT on January 6, 2019. Longitudes that are sub-lunar at this time are near 22 West while those which are sub-solar are near 158 East longitude. These include the mid-Atlantic, South Sandwich Islands and Iceland in the west and Kamchatka, Komandorsky Islands, Kurils, the Solomon and Vanuatu among others. These areas will experience the strongest tidal stresses associated with the new moon and could see a triggered strong earthquake in the next week. Other areas will also see tidal stresses and could see increased seismicity at this time." (January 2-5, 2019)

 

Deep quakes such as the under Brazil can trigger far-field seismicity. But is is slightly different than that from shallow events. In general maximum concentration of energy on the surface from deep focus events occurs not around 103 degrees but around 100 degrees (or at 106 degrees due to a surface reflection near the epicenter) from the mainshock. This is the distance where maximum seismic enhancement is expected with events such as today's under Brazil.

 

The most unusual earthquake today was an M 4.7 in Uganda, Africa. NEIC reported this earthquake of M 4.7 in Uganda was felt with intensity IV in Arua Northern Uganda and II-III in the area(s) of Uganda at Gulu, Nakasongola, Jinja-Kawempe and Kampala and in Bunia Haut-Congo, DR Congo. This epicenter is located at 103 degrees from the M 6.8 in Brazil and could be related. Forecast 122243 expected activity in this area of Uganda at the beginning os 2019.

 

O:  5JAN2019 18:13:44   3.1N   31.4E mb=4.7  EMSC   UGANDA                       

P:  1JAN2019 122243     2.0S   29.0E 3.0-4.5 BCBAA  Lake Victoria area         

 

 

The last earthquake under Brazil within about 250 km of this with M>=6.8 was an M 7.1 about 250 km south of this on August 24, 2018 and prior to that an M 7.6 near that same epicenter on November 24, 2015. The last within about 200 km was an 7.1 on June 20, 2003. An event of M 6.9 hit within about 25 km of today's epicenter on October 12, 2002. Forecasts 12251 and 122452 had expected this activity was likely in late December or early January but at a lower magnitude than occurred.

 

A further promoter of the Brazil event may have been Tropical Storm Pabuk. This storm has been passing over the region of Thailand west of the Philippines over the past several days. It passed over the antipode of the Brazil event two days ago. Such tropical storms can generate microseisms which focus at the antipode and can destabilize regional tectonics. A case can be made for this as a seismic promoter to a large number of significant evetns.  

 

 

O:  5JAN2019 19:25:39   8.2S   71.6W Mw=6.8  EMSC   ACRE, BRAZIL                 

P:  1JAN2019 122251     8.0S   78.0W 4.0-5.5 BACAA  No. Peru                   

P: 28DEC2018 122452    11.0S   74.0W 4.0-5.6 CCBAA  Central Peru               

 

The strongest earthquake in the U.S. or Canada today was an M 6.0 in the eastern Andreanof Islands. NEIC reported it was felt with intensity V in Adak and II in Atka, Alaska. It was followed by a series of light to moderate aftershocks including an M 4.0 and 4.1. Like the earthquake in Brazil, this epicenter also experienced strong tidal and geomagnetic effects at this time and the magnitude of this event was probably enhanced by these. The last earthquake within about 150 km of this epicenter with M>=6.0 occurred on August 23, 2018 with M 6.3, an aftershock of an M 6.6 on August 15, 2018. Several outer rise events in this area had suggested the possibility of a  strong earthquake at this longitude was coming. Forecast 122413 had expected the Andreanof Islands would be active in late December or early January. The distance from the M 6.8 under Brazil is 106 degrees and concentrated energy from that event about an hour earlier may have helped enhance today's magnitude in the Andreanof Islands.

 

 

O: 05JAN2019 19:03:24  51.1N  178.2W mb=4.1  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 05JAN2019 18:55:42  51.2N  178.1W ml=3.2  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 05JAN2019 18:50:14  51.2N  178.1W ml=3.4  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 06JAN2019 01:26:41  51.2N  178.4W mb=4.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O: 05JAN2019 18:58:59  51.4N  178.1W ml=3.6  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS.

O:  5JAN2019 18:47:11  51.4N  178.3W Mw=6.0  EMSC   ANDREANOF ISLANDS, ALEUTIAN IS

P: 29DEC2018 122413    52.4N  174.3W 3.5-5.4 CACAA  Andreanoff Isls, Aleutians 

 

An M 5.0 quake also hit northern Alaska near Tanana. NEIC reported it was felt with maximum intensity V in Galena, Alaska and II-IV in Manie Hot Springs, Huslia, Ruby, Clear, oldotna and Fairbanks, Alaska. This area has shown some swarming of moderate sized earthquakes in the past several months, possibly precursory activity to larger regional events. The last event within about 150 km of this epicenter with M>=5 was an M 5.3 on October 27, 2018 and prior to that an M 5.1 on November 13, 2003. This is the fourth event in Alaska of M>=5 since the beginning of 2019, an active start to the New Year. Each occurred in a separate epicentral area. Forecast 122436 had expected today's activity to the southeast.

 

O:  6JAN2019 03:45:35  65.4N  153.3W ML=5.0  EMSC   NORTHERN ALASKA              

P: 29DEC2018 122436    63.3N  151.0W 3.2-5.1 CBAAA  Central Alaska             

 

An unusually large M 3.1 occurred in Yellowstone National Park, Wyoming today within minutes of local solar noon and was probably enhanced by energy from the new moon tidal alignment. It has been some time - the last of M>=3.1 in  Yellowstone was an M 3.1 on May 6, 2008 - since an event of this magnitude

 in Yellowstone. The last of M>3.1 was an M 3.3 pm August 21, 2017.  Forecast 122409 had expected Yellowstone to be active at the beginning of January.

 

O:  5JAN2019 19:35:00  44.5N  110.2W Ml=3.1  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O:  6JAN2019 05:35:11  44.8N  110.2W Ml=2.2  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P:  1JAN2019 122409    44.6N  110.8W 2.0-4.0 BAAAA  Yellowstone/Wyoming        

 

The third moderately strong to strong earthquake of the day was an M 5.8 in the northern Volcano Islands, Japan. It was not reported felt in the epicentral area but may have been felt in Okinawa according to JMA. The last event within about 200 km of this epicenter with M>=5.8 occurred with M 7.4 on December 21, 2010. Forecast 122310 expected the Volcano Islands would be active near the turn of the year.  This epicenter is at 142 degrees from the M 6.8 under Brazil earlier in the day. Seismic energy from deep focus quakes reflects and refracts off core  boundaries and return in a concentrated form at about 142 degrees on the  surface. Given this, today's event in the Volcano Islands was probably promoted from Brazil.

 

O:  5JAN2019 22:54:16  25.8N  144.6E Mw=5.8  EMSC   VOLCANO ISLANDS, JAPAN REGION

P: 28DEC2018 122310    21.0N  146.0E 4.0-5.8 CCAAA  Volcano Islands            

 

UNUSUAL QUAKES FROM NORTH ATLANTIC TO GULF OF CALIFORNIA

 

EARTHQUAKE SUMMARY FOR JANUARY  4, 2019

 

A series of moderate quakes hit unusual epicenter from the North Atlantic (M 4.9) to Guadeloupe and Trinidad (4.6, 4.4) in the Caribbean to the Gulf of California (M 4.9, 4.2). Some of these appear to have relation of tropical cyclones. The earthquake in Trinidad is at 103 degrees from the major Komandorsky M 7.3 and may have been promoted by concentrated energy from that event.

 

An unusually large M 4.9 earthquake shook the region of the Gulf of California today. It was followed by an M 4.2 seven hours later. The last earthquake with M>4.9 in the Gulf of California within about 200 km of these epicenters was an M 6.3 on January 19, 2018 and prior to that an M 4.7 on January 29, 2017.  NEIC reported this earthquake of M 4.9 in the Gulf of California, Mexico was felt with intensity II-III in the area(s) of Loreto and Cabo San Lucas, Baja California. Earthquakes in the Gulf of California can migrate to the north threatening areas of Baja California in several days time. Today's events were forecast in forecast 122299 to occur in early January.

 

NHC is reporting an area south of the Gulf of California is showing tropical storm characteristics. This system extends north to the Gulf of California and  stresses from this may have helped promote two moderate quakes in the Gulf of California today. NHC gives this a 30% chance of developing into a tropical depression in the next two days (through January 7).

 

O:  4JAN2019 19:55:39  26.4N  110.7W ML=4.2  EMSC   GULF OF CALIFORNIA           

P: 30DEC2018 122299    28.0N  112.0W 3.5-5.2 BBAAA  Gulf of California         

 

O:  4JAN2019 12:33:07  26.4N  110.8W mb=4.9  EMSC   GULF OF CALIFORNIA           

P:  1JAN2019 122299    25.0N  113.0W 3.5-5.0 BBBAA  Gulf of California         

 

An unusual earthquake of M 4.9 also occurred in the northern Mid-Atlantic Ridge today. It was not reported felt in this remote area. The last earthquake within about 200 km of this epicenter of M>=4.9 occurred on  Forecast 122223 had expected activity in this area at the end of December or early January. The antipode of this epicenter is at a point between New Guinea and northern Australia where Tropical Storm Penny passed over December 31, 2018 as noted in this summary at the time. Antipodal activity in the North Atlantic had been expected with Penny.

 

"An earthquake of M 5.0 in the northern Mid-Atlatnic today may have been promoted by antipodal effects from Tropical Cyclone Penny. This oceanic storm is near the antipode of the North Atlantic epicenter. There are a number of cases in which antipodal concentration of energy from storms appears to help  promote ocean ridge seismicity an dvolcanism." (January 1, 2019)

 

TC    08P      2018-12-31  00:00 UT  12.3S  140.2E  045 kts  North of eastern Australian

 

The last earthquake within about 200 km of this epicenter in the North Atlantic with M>=4.9 occurred December 3, 2017 with M 4.1.

 

O:  4JAN2019 21:43:11  11.3N   39.8W mb=4.9  EMSC   NORTH ATLANTIC OCEAN         

P: 26DEC2018 122223     8.0N   37.0W 4.0-5.8 CCAAA  Central Mid-Atlantic Ridg  

 

Moderate earthquakes today also shook regions of Trinidad (M 4.6) and Guadeloupe (M 4.4). These were forecast (#122295 and 122279) to occur in late December to early January. The last earthquake of M>=4.5 in the Trinidad region was an M 5.1 on October 21 while the last in Guadeloupe of M>=4.4 was an M 5.0 on April 5, 2018.

 

NEIC reported the earthquake of M 4.4 in Guadeloupe was felt with intensity II-III in the area(s) of Point-a-Pitre, Grande-Terre and Petit Bourg Basse-Terra, Guadeloupe.

 

O:  4JAN2019 14:33:03  11.0N   61.5W ML=4.6  EMSC   TRINIDAD REGION, TRINIDAD-TOBA

P: 30DEC2018 122295    11.0N   62.0W 3.4-5.1 BAAAA  Windward Islands           

 

O:  4JAN2019 22:52:47  16.9N   61.1W Mw=4.4  EMSC   GUADELOUPE REGION, LEEWARD ISL

P: 27DEC2018 122279    15.0N   61.0W 3.0-5.0 CBAAA  Leeward Islands            

 

The strongest earthquake in the U.S. or Canada today was an M 4.1 off the western coast of northern California. It was not reported felt on the mainland. The last earthquake within about 100 km of this epicenter with M>=4.1 was recorded on 4.1 and 4.5 on November 16, 2018. Forecast 122393 had expected this activity was likely at the end of December within about 50 km of this epicenter.

 

O:  4JAN2019 22:58:43  41.9N  126.1W mb=4.1  EMSC   OFF COAST OF NORTHERN CALIFORN

P: 27DEC2018 122393    42.1N  126.9W 3.0-4.8 CAAAA  Off Coast of Oregon        

 

ANTIPODAL KOMANDORSKY; SOUTH SANDWICH ISLANDS REMAIN ACTIVE

 

EARTHQUAKE SUMMARY FOR JANUARY  3, 2019

 

The strongest seismicity in the world today were a pair of events of M 5.4 in the antipodal areas of the Komandorsky Islands, Russia dn in the South Sandwich Islands. These areas are aftershock regions of recent major earthquakes. The last earthquake in the Komandorsky aftershock sequence of M>=5.4 was an M 6.2 on December 24, 2018 following a major event of M 7.3 on December 20, 2018. The last earthquake in the South Sandwich Islands within about 200 km of today's epicenter was an M 7.1 on December 11, 2018, the mainshock in the current activity in the South Sandwich Islands. Forecasts 1222505 and 122419 had expected these areas to be active in late December or early January.

 

O:  3JAN2019 21:35:15  54.9N  164.8E mb=5.4  EMSC   KOMANDORSKIYE OSTROVA REGION 

O: 04JAN2019 06:49:23  54.9N  164.8E mb=4.4  ANSS   WSW of Nikol'skoye Russia

O:  3JAN2019 20:07:17  54.9N  165.5E mb=4.3  EMSC   KOMANDORSKIYE OSTROVA REGION 

O:  3JAN2019 17:56:42  55.0N  164.7E mb=4.3  EMSC   KOMANDORSKIYE OSTROVA REGION 

P: 27DEC2018 122419    55.0N  164.0E 4.0-5.7 CAAAA  Komandorsky Isl            

 

O:  3JAN2019 12:47:41  59.8S   26.6W mb=5.4  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 28DEC2018 122505    61.0S   26.0W 4.0-5.4 BBAAA  Southern  Ocean            

 

The strongest earthquake in the world today was an M 5.6 in the region of the Banda Sea, Indonesia. NEIC reported this earthquake of M 5.6 in The Banda Sea, Indonesia was felt with intensity II-III in the area(s) of Coonawarra, Northern Territory, Australia. The last earthquake within about 200 km of this epicenter with M>=5.6 in the Banda Sea occurred December 1, 2018 with M 6.3 and prior to that as an M 6.4 on March 24, 2018. Forecast 122264 had expected today's event was likely around December 30 within about 75 km of today's epicenter.

 

O:  4JAN2019 06:22:44   6.5S  130.4E mw=5.6  ANSS   NNW of Saumlaki Indonesia    

P: 30DEC2018 122264     7.0S  131.0E 4.0-5.6 BAAAA  West Irian, PNG            

 

The strongest seismicity in the U.S. or Canada today continued in the region of the Alaska Peninsula. An M 4.7 in this region was not reported felt today. The last earthquake within about 150 km of this epicenter with M>=4.7 occurred on November 21, 2018 with M 5.7 and prior to that an M 5.3 on May 11, 2018. Forecast 122411 had expected today's activity in early January 2019. This follows earthquakes of M 5.0 in the Anchorage and Kodiak Island areas on January 1 and 2.

 

O:  3JAN2019 18:51:35  58.6N  154.3W mb=4.7  EMSC   ALASKA PENINSULA             

O: 04JAN2019 04:37:54  55.3N  158.0W mb=4.1  ANSS   Chernabura Island Alaska

P:  1JAN2019 122411    54.7N  156.9W 3.5-4.9 AABAA  Alaska Peninsula           

 

An earthquake of M 4.5 occurred today in the Andaman Islands, India. It was not reported felt, but may have been triggered by TS Pabuk which was passing south of this epicenter at the time of the event as noted in previous issues of this summary:

 

"TS PABUK continued today over the Nicobar and Andaman Islands with winds up to 65 kts. It is expected to track over Sumatra and the Malay Peninsula over the next several days, The region is currently active with moderate earthquakes nearly every day and this should continue with Pabuk in the area.  Other enhanced seismicity is likely in southeast Asia in the next several days." (January 2, 2019)

 

A similar M 4.5 hit the Andaman Islands December 27, 2018 but the last of larger

 magnitude in the region was an M 5.1 on October 1, 2018. Forecasts 122265 had expected today's event in the Andaman Islands was likely around January 1, 2019.

 

O:  3JAN2019 14:03:42  11.9N   93.3E mb=4.5  EMSC   ANDAMAN ISLANDS, INDIA REGION

P:  1JAN2019 122265    11.0N   92.0E 4.0-5.7 AAAAA  Andaman Islands             

 

MODERATE SHAKING IN SICHUAN, CHINA

 

EARTHQUAKE SUMMARY FOR JANUARY  2, 2019

 

The strongest earthquake in the world today was an M 5.2 in Sichuan, China. NEIC reported this earthquake of M 5.2 in Sichuan, China was felt with intensity II-III in the area(s) of Changdu, Sichuan and in Ganzhou, Jiangxi, China.  The last earthquake within about 200 km of this epicenter of M>=5.2 was an M 5.4 on December 16, 2018 and prior to that on January 27, 2017.  Forecast 122305 had expected this event within this area was likely at the end of 2018 or in early 2019. Minor, unreported damage is likely in the epicentral area.  This epicenter is at the fifth node (72 degrees) from Anchorage, Alaska where an M 7.1 occurred November 30 and may have been promoted from that source. O:  3JAN2019 00:48:08  28.3N  105.0E mb=5.2  ANSS   WSW of Zhongcheng China   

 

O:  3JAN2019 00:48:08  28.2N  105.0E mb=5.2  EMSC   SICHUAN-GUIZHOU BORDER RG, CHI

P: 29DEC2018 122305    27.0N  104.0E 4.0-5.4 BBAAA  Myanmar                    

 

The Anchorage, Alaska aftershock zone remained active today with six events of M>=3 including the largest in the U.S. or Canada - an M 4.4. The area experienced the strong long-term aftershock to date as an M 5.0 on January 1, 2019. Forecast 122433 had expected aftershocks up to M 5.0 in the area in late December or early January.

 

O: 03JAN2019 01:56:33  61.1N  150.2W ML=3.3  EMSC   SOUTHERN ALASKA

O: 02JAN2019 15:16:00  61.3N  150.0W mb=4.4  EMSC   SOUTHERN ALASKA

O: 02JAN2019 20:03:24  61.4N  150.1W ML=3.0  EMSC   SOUTHERN ALASKA

O: 02JAN2019 11:15:31  61.5N  150.0W ML=3.0  EMSC   SOUTHERN ALASKA

O:  2JAN2019 11:12:14  61.5N  150.0W ML=3.3  EMSC   SOUTHERN ALASKA              

P: 24DEC2018 122433    61.1N  150.2W 3.2-5.0 CAAAA  Central Alaska             

 

A series of moderate earthquakes shook the region of New Zealand today. These included an M 5.2 in the Te Anau  region of South Island and an M 4.9 off eastern North Island. Others of M 4.1 also hit South Island and northwest of North Island.

 

GEONET reported 2 people felt the M 4.2 quake with weak intensity.

GEONET reported the M 5.2 felt with weak intensity by one person.

GEONET reported the M 4.9 felt with light intensity northeast of Whanganui and in southeastern North Island. More than 65 people reported feeling this earthquake. Light to moderate intensity was reported throughout much of southern and eastern North Island and northern South Island. 47 reports of weak intensity; 13 of light intensity; 5 with moderate; 0 with strong shaking and 0 with severe and 0 with extreme intensity. GEONET reported the M 4.2 off North Island was felt with moderate intensity in the area of northern North Island,  New Zealand. 82 people reported feeling this earthquake with 38 feeling weak intensity and 39 with light intensity; four with moderate intensity and 1 with severe intensity in North Island, New Zealand; none felt the quake with strong or extreme intensity.

 

Forecasts 122499, 122497 and 122488 had expected this active in New Zealand at

this time. The events in South Island are at 103 degrees from the Komandorsky M 7.3 of December 20 and were probably promoted by energy from that event. Those in North Island area 101-103 degrees from Anchorage, Alaska.

 

O:  3JAN2019 05:07:11  45.0S  166.7E mb=4.1  EMSC   OFF W. COAST OF S. ISLAND, N.Z

P: 30DEC2018 122499    46.0S  167.0E 3.0-4.9 BAAAA  Southern S. Isl. N.Z.      

 

O:  3JAN2019 03:25:50  48.0S  165.5E mb=4.7  EMSC   OFF W. COAST OF S. ISLAND, N.Z

O:  3JAN2019 03:25:51  47.9S  165.3E ML=5.2  GEONET Felt with weak intensity by on

P: 30DEC2018 122499    46.0S  167.0E 3.0-4.9 BBBAA  Southern S. Isl. N.Z.      

 

O:  2JAN2019 21:20:30  41.0S  176.6E MS=4.9  GEONET Felt with light intensity nort

P: 24DEC2018 122497    41.0S  176.0E 3.0-5.0 CAAAA  So. Island, N.Z.            

 

O:  2JAN2019 12:38:37  35.7S  175.0E ML=4.2  GEONET Felt with moderate intensity i

P: 29DEC2018 122488    37.0S  177.0E 3.0-4.6 BBBAA  North Island, N.Z.         

 

MODERATE QUAKE SHAKES KODIAK, ALASKA

 

EARTHQUAKE SUMMARY FOR JANUARY  1, 2019

 

The strongest earthquake in the U.S. or Canada today was an M 4.8-5.0 near Kodiak Station, Alaska. NEIC reported it was felt with intensity II-III within about 400 km of the epicenter with reported intensities at Kodiak, Homer, Kenai, and Anchorage, Alaska. This is the second M 5.0 in Alaska in the past two days, an unusual occurrence for the beginning of the year. The last event of M>=5 in the Kodiak Island area within about 150 km of this epicenter was an M 5.4 on August 31, 2017. An M 5.7 occurred about 150 km north of this at an intermediate depth on November 21, 2018 and as an M 5.1 on March 9, 2018, the only such events in the past year in the region.  Forecast 122411 had expected today's activity around January 1.

 

O:  2JAN2019 06:48:42  58.4N  153.2W mb=5.0  EMSC   KODIAK ISLAND REGION, ALASKA 

P:  1JAN2019 122411    54.7N  156.9W 3.5-4.9 ACBAA  Alaska Peninsula           

 

The activity in Kodiak is at a high latitude and may have been promoted by the current geomagnetic storm - described previous in this summary as:

 

"The geomagnetic field saw minor storm conditions today. The AP level was 21. High latitude geomagnetic field also saw minor storm conditions  with AP at 06.  This continues the strongest geomagnetic storm in at least a month - since it reached 35 on November 5, 2018. Areas near the geomagnetic equator and at high latitudes are expected to see enhanced seismicity with this storm with the possibility of a strong to major earthquake. Mindanao, Philippines lies on the geomagnetic equator." (December 29-30, 2018)

 

An earthquake of M 4.3 was widely felt today in southern Italy. NEIC reported this earthquake of M 4.3 in Italy was felt with intensity II-III in the area(s) of Ovindoli, Sora Lazio, Roccaraso Abruzzen, Cave Lazio, San Cesareo, Poggio, Frascati, Castel Gandolfo and Rome, Italy. This may be related to the current eruption of Mt. Etna to the southeast. Both (and central California) are located at 103 degrees from the M 7.0 in Mindanao, Philippines and may have been promoted by concentrated energy from that event. A series of moderate quakes hit the region about 150 km to the east of today's epicenter from August 14 to August 16, 2018 with maximum magnitude up to M 5.3. The last within about 100 km of this epicenter with M>4.3 was an M 5.2 on January 18, 2017.

 

O:  1JAN2019 18:37:47  41.9N   13.6E mb=4.3  EMSC   SOUTHERN ITALY               

P: 30DEC2018 122328    39.0N   15.0E 3.0-4.7 ACAAA  Mediterranean/Sicily       

 

The most active region of the world today was the area of Sumatra, Indonesia.  The largest event of the day was an M 5.2 in northern Sumatra but other events of moderate size also occurred south and east of this. This area is located near 103 degrees from the M 7.1 in Anchorage, Alaska of November 30, 2018 and has active since that time. Forecasts 122233 and 122257 had expected moderate activity in this zone at the end of December, 2018 or early January, 2019.

 

NEIC reported the event of M 5.2 in Sumatra, Indonesia was felt with intensity II-III in the area(s) of Banda Aceh, Indonesia.

 

O:  1JAN2019 11:55:01   5.4N   94.6E mb=5.2  EMSC   NORTHERN SUMATRA, INDONESIA  

P: 24DEC2018 122233     3.0N   94.0E 4.0-5.5 CCAAA  Nicobar Islands             

 

O:  1JAN2019 20:24:39   2.4S   99.8E mb=5.0  EMSC   EP. MENTAWAI REGION, INDONESIA

P: 26DEC2018 122257     2.0S   99.0E 4.0-5.5 BAAAA  So. of Sumatera            

P: 29DEC2018 122257     2.0S  101.0E 4.0-5.6 AAAAA  So. of Sumatera            

 

More Statistics:

 

The following list is the number of times this summary has cited earthquakes in the given region(s) of the U.S. or Canada during the course of 2018 and gives some idea of the relative activity.

 

# Citations Region

 

 170 Alaska Peninsula            

  26 Alberta                    

 282 Andreanoff Isls, Aleutians 

  10 Arctic Ocean Region        

 108 Baffin/Davis Strait Canada 

 172 British Colombia           

 942 California/Nevada area     

 748 Central Alaska             

1682 Central California         

 106 Central Chile              

 100 Colorado area              

 108 E. of Maine                

 148 Fox Islands, Aleutians     

 444 Gulf of Alaska             

 208 Gulf of California         

 494 Hawaii                      

 164 Kentucky/Tennessee/NC      

 200 Maine                      

 196 Montana/Idaho              

   8 Nebraska                   

  58 Nevada area                

 144 New England                

 330 New Madrid area            

 190 New York State             

 244 Northern Alaska            

 250 Northern California        

  18 Nunavit/Hudson Bay, Canada 

 288 Off Coast of No. Calif     

 144 Off Coast of Oregon        

  84 Off So. California         

  56 Ohio/Lake Erie              

  80 Oregon state, U.S.         

   4 Quebec, Canada             

 198 SW U.S.A                   

2008 So. California             

 110 So. Peru/Bolivia           

  30 So. Sandwich Islands       

  44 So. of Panama              

  84 Southeast Alaska           

  86 Southeast U.S.             

 732 Southern Plains            

 150 Unimak Islands, Aleutians  

 140 Utah area                  

 136 Vancouver Island area      

 266 Washington state, U.S.     

 284 Yellowstone/Wyoming         

  56 Yukon Territory, Canada    

 

MODERATE AFTERSHOCK NEAR ANCHORAGE WIDELY FELT

 

EARTHQUAKE SUMMARY FOR DECEMBER 31, 2018

 

Some earthquake statistics from the year 2018 are in order as the world enters the year 2019. The following list is the approximate number of events at each magnitude arround the world during 2018.

 

M 5.0 - 408; M 5.1 - 304; M 5.2 - 266; M 5.3 - 196; M 5.4 - 145

M 5.5 - 99; M 5.6 - 90; M 5.7 - 51; M 5.8 - 41; M 5.9 - 44

M 6.0 - 25; M 6.1 - 21; M 6.2 - 16; M 6.3 - 18; M 6.4 - 8

M 6.5 - 6; M 6.6 - 7; M 6.7 - 3; M 6.8 - 6; M 6.9 - 6

M 7.0 - 4; M 7.1 - 4; M 7.2 - 1; M 7.3 - 3; M 7.4 - 0

M 7.5-8.2 - 8.

 

More such statistics will be added in coming issues.

 

A moderate earthquake of M 5.0 shook the aftershock zone of the Anchorage, Alaska region today. NEIC reported it was felt with intensity up to IV in Anchorage, Elmendorf AFB, abd Fort Richardson, Alaska and with lesser intensity of II-III as far as 200 km from the epicenter at Homer, Alaska. This is the strongest long-term aftershock of the M 7.1 in Anchorage of November 30, 2018. The last event of M>=5 in the area was an M 5.2 on December 1, 2018 Forecast 122433 had expected enhanced seismicity in the aftershock zone at the end of December. There were no reports of major damage or casualties from today's aftershock. This is the strongest earthquake on January 1 in the U.S. or Canada in at least 30 years.

 

O: 31DEC2018 10:31:34  61.1N  151.2W ML=3.7  EMSC   SOUTHERN ALASKA              

O: 31DEC2018 14:23:06  61.4N  150.1W ML=3.1  EMSC   SOUTHERN ALASKA              

O: 31DEC2018 22:57:42  61.4N  150.1W ML=3.2  EMSC   SOUTHERN ALASKA              

O:  1JAN2019 03:03:29  61.4N  150.1W Mw=4.9  EMSC   SOUTHERN ALASKA              

P: 24DEC2018 122433    61.1N  150.2W 3.2-5.0 CAAAA  Central Alaska             

 

A pair of light earthquakes of M 2.4 and 2.7 were felt in the area near Old Faithful Geyser in Yellowstone National Park today. NEIC reported this earthquake of M 2.7 in Yellowstone, Wyoming was felt with intensity II-III in the area(s) of Thermopolis, Wyoming and Saint Regis, Montana.  The last event within about 50 km of this epicenter with M>=2.7 occurred October 21, 2018also with M 2.7. The last of larger magnitude was an M 2.9 on September 11, 2018. Forecast 122409 expected this event was likely at the beginning of 2019. Yellowstone is located at the seventh node (52 degrees) from the M 7.3 in the Komandorsky Islands of December 20.

 

O: 31DEC2018 10:21:08  44.6N  110.5W Ml=2.4  EMSC   YELLOWSTONE NAT. PARK, WYOMING

O: 31DEC2018 07:25:45  44.6N  110.5W Ml=2.7  EMSC   YELLOWSTONE NAT. PARK, WYOMING

P:  1JAN2019 122409    44.6N  110.8W 2.0-4.0 AAAAA  Yellowstone/Wyoming        

 

The strongest earthquake in the world today was an M 5.3-5.4 in the region of San Juan, Argentina. NEIC reported this earthquake of M 5.3 in Argentina was felt with intensity IV in San Juan, Argentina and Quillota and Vina Del Mar, Chile and II-III in the area(s) of Chile at Villa Alemana, Limache, Valparaiso, Santiago, Lampa, Calera, Chile and in Mendoza, Argentina.  GUC reported this earthquake was felt with intensity  IV in  Santiago at Colina; III in Santiago and Talagante; in Valparaiso at Los Andes and Putaendo and in Coquimbo with III in La Serena dn Salamnca, Chile. Forecast 122483 had expected this activity in Chile at the end of December.

 

O: 31DEC2018 10:49:40  31.8S   69.3W Mw=5.3  EMSC   SAN JUAN, ARGENTINA          

P: 27DEC2018 122483    32.0S   70.0W 4.0-5.4 BAAAA  Central Chile              

 

An earthquake of M 5.0 in the northern Mid-Atlantic today may have been promoted by antipodal effects from Tropical Cyclone Penny. This oceanic storm is near  the antipode of the North Atlantic epicenter. There are a number of cases in which antipodal concentration of energy from storms appears to help  promote ocean ridge seismicity and volcanism. This summary had noted this in previous issues such as:

 

"TC    PENNY    2019-01-01  00:00 UT  12.7S  143.0E  045 kts  North of eastern Australian

 

Tropical cyclone Penny continued today between New Guinaa and Australia with winds up to 45 kts. It is expected to track tio the south and east over the next several days. Some seismic enhance is likely in New Guinea in this time frame." (December 31, 2018)

 

Forecast 122285 had expected the event in the North Atlantic was likely at the first of 2019.

 

O: 31DEC2018 20:45:31  15.2N   46.3W mb=5.0  EMSC   NORTHERN MID-ATLANTIC RIDGE  

P:  1JAN2019 122285    15.0N   45.0W 4.0-5.8 AAAAA  Mid-Atlantic Ridge         

 

STRONG EARTHQUAKE SHAKES ALASKA PENINSULA

 

EARTHQUAKE SUMMARY FOR DECEMBER 30, 2018

 

A strong earthquake of M 6.1 shook a large portion of the Alaska Peninsula today continuing strong high latitude activation associated with the current geomagnetic storm. NEIC reported this earthquake was felt with moderate (II-III) intensity in  Alaska at King Cove, Akutan, Unalaska, Homer, Anchorage, and Chugiak among other localities within about 1000 km. The last earthquake in the Alaska Peninsula with M>=6.1 within about 200 km of this epicenter was an M 6.3 on July 26. 2011 and prior to that an M 6.3 on October 2, 2007. The strongest earthquake in the area in the past 30 yeasrs was an M 7.0 on May 30, 1991. Forecast 122430 jad expected this event within about 100 km was likely to  occur around December 30.

 

O: 31DEC2018 02:35:39  54.6N  161.6W Mw=6.1  EMSC   ALASKA PENINSULA             

P: 30DEC2018 122430    54.1N  162.8W 3.5-5.1 AAAAA  Unimak Islands, Aleutians  

 

The description of likely seismic consequences of the current geomagnetic storm read:

 

"The geomagnetic field saw minor storm conditions today. The AP level was 21. High latitude geomagnetic field also saw minor storm conditions  with AP at 06.  This continues the strongest geomagnetic storm in at least a month - since it reached 35 on November 5, 2018. Areas near the geomagnetic equator and at high latitudes are expected to see enhanced seismicity with this storm with the possibility of a strong to major earthquake. Mindanao, Philippines lies on the geomagnetic equator." (December 29-30, 2018)

 

A moderately strong earthquake of M 5.8 also occurred in southern Sumatra, Indonesia today. This epicenter is about 10 degrees south of the geomagnetic equator and was probably promoted by that storm as noted above. BMG reported this earthquake was felt with intensity IV in Kota Bengkulu; III in Manna, Mukomuko, Lebong, Oesisir Selatan and II in Mentawai, Panaman and Padang, Sumatra, Indonesia. This does not appear to be a part of the eruption of Krakatau which triggered a tsunami killing over 400 on December 22. It is close to that eruption however. Nearby earthquakes can distrupt the plumbing of volcanoes and can lead to  changes in the characteristics of eruptions, bor better or worse. This epicenter is located at 101-103 degrees from the M 7.1 near Anchorage, Alaska of November 30, 2018. As the eruption is also at this distance from Anchorage, it is likely this  regional activation was in part promoted by energy from that Alaskan event.

 

The last earthquake of M>=5.8 within about 250 km of this epicenter was an M

6.4 on August 13, 2017 and prior to that an M 5.8 on August 24, 2016. Forecasts 122257 and 122258 had expected a moderately large quake in this area was likely at the end of December.

 

O: 30DEC2018 08:39:12   2.7S  102.3E Mw=5.8  EMSC   SOUTHERN SUMATRA, INDONESIA  

P: 24DEC2018 122258     4.0S  103.0E 4.0-5.5 CBAAA  So. of Sumatera            

P: 29DEC2018 122257     2.0S  101.0E 4.0-5.6 AABAA  So. of Sumatera            

 

An unusual series of earthquakes also occurred today in the region of northern Arizona with events of M 2.5, 3.1 and 3.2.  NEIC reported this earthquake of M 3.2 in Arizona  was felt with intensity II-III in the area(s) of Ash Fork, Fountain Hills and Tempe, Arizona.  An earlier event in the day hit the same areas with M 3.1. NEIC reported it was felt with intensity II-III in Ash Fork, Williams, and Chandler, Arizona. The last earthquake within about 100 km of this epicenter with M>=3.2 occurred on OCtober 9, 2016 about 75 km northwest of this epicenter with M 3.5.  Forecast 122343 had expected this activity to the southeast was likely around December 29.

 

O: 30DEC2018 09:08:56  35.3N  112.6W ML=3.1  EMSC   ARIZONA                      

O: 30DEC2018 20:31:27  35.3N  112.6W ML=3.2  EMSC   ARIZONA                      

O: 30DEC2018 14:40:08  35.4N  112.6W ML=2.5  EMSC   ARIZONA                      

P: 29DEC2018 122343    34.7N  111.0W 2.0-4.0 AAAAA  SW U.S.A                   

 

An unusual earthquake occurred with M 4.9 in Thailand today.  This may have been triggered by stresses from TD 35W, the same storm which was in Mindanao at the time of the M 7.2 there two days ago. This summary had expected seismicity enchancement in the region with this storm as:

 

"TD 35W continued today west of the southern Philippines with winds up to 40 kts. It is expected to track to dissipate over the next day. but may intensify as it reaches the Gulf of Thailand. An unusual earthquake in Thailand today was probably promoted by stresses associated with this storm. Other enhanced seismicity is likely in southeast Asia in the next several days." (December 30-31, 2018)

 

Forecast 122266 had expected regional activity at the end of December.

 

O: 30DEC2018 15:39:18  14.9N   99.1E ML=4.9  EMSC   THAILAND                      

P: 25DEC2018 122266    19.0N   96.0E 4.0-5.4 BCCAA  Andaman Islands            

 

SEISMICITY UP NEAR 103 DEGREES FROM MINDANAO, PHILIPPINES

 

EARTHQUAKE SUMMARY FOR DECEMBER 29, 2018

 

The expected pattern of enhanced seismicity near 103 degrees from the M 7.0-7.2 quake in southern Mindanao yesterday occurred today. This activity occurred in central California, Iceland, the Reykjanes Ridge, and Sicily among others. This summary had expected in the previous issue:

 

"The distance near 103 degrees from Mindanao passes through central and Southern California. In 1992 the Landers quake in southern California (M 7.6) hit a month after the M 7.3 quake in Mindanao near this distance and was probably promoted from it. Other areas near 103 degrees from today's epicenter in the Philippines include Sicily, Iceland and portions of northwestern U.S as well as the Antarctic and East Pacific Rise. Areas at 144 degrees or nearby include the northern Caribbean, Panama and southern Chile as well as portions of the Central Mid-Atlantic ridge. These areas are particularly prone to seismic enhancement at this time." (December 29, 2018)

 

A somewhat unusual epicenter in Central California was active at 103 degrees from Mindanao today. An event of M 2.6 at 37N was the first of this magnitude or greater within about 40 km of this epicenter since an M 2.8 on January 14, 2017 nearly two years ago. The last event of M>=3 in this area was an M 3.4 on June 4, 2016. At this distance and timing, this event is likely promoted by energy from Mindanao. Forecast 122319 had expected this activity in this area around December 28.

 

NEIC reported this earthquake of M 2.6 in Central California was felt with intensity II-III in the area(s) of Aptos, Soquet, Capitola, Santa Cruz, Scotts Valley, Felton, Ben Lomond among others in California.

 

O: 30DEC2018 06:15:04  37.0N  121.9W Md=2.6  EMSC   NORTHERN CALIFORNIA          

P: 28DEC2018 122319    37.3N  121.6W 2.5-4.6 AAAAA  Central California         

 

An unusual earthquake near Reykjavik, Iceland of M 4.3 also occurred near 103 degrees from Mindanao today.  NEIC reported this earthquake of M 4,3 in Iceland was felt with intensity II-III in the area(s) of Reykjavik, Icealand.  This is the strongest earthquake within about 150 km of this epicenter since an M 4.8 on October 13, 2013. More recent activity has been centered about 200 km to the northeast of this. Forecast 122439 had expected activity in Iceland at the end of December.

 

O: 30DEC2018 02:56:21  64.1N   20.9W mb=4.3  EMSC   ICELAND                      

O: 30DEC2018 02:56:22  64.2N   21.0W mb=4.3  ANSS   ICELAND                       

P: 24DEC2018 122439    62.0N   27.0W 3.0-4.6 CCBAA  Iceland area               

 

South of this a pair of earthquakes of M 4.7 and 4.8 occurred on the Reykjanes Ridge in the Northern Mid-Atlantic Ridge system. They were not felt in this remote area but had been expected in forecast 122422 to occur at the end of December. The last events within about 250 km of these epicenter with M>=4.8 was recorded on December 14, 2018 with M 5.0. Other such quakes in the past year in this region included an M 4.9 and 5.3 on November 2, 2018 and an M 4.9 on August 14, 2018.

 

O: 29DEC2018 19:44:40  56.9N   34.3W mb=4.7  EMSC   REYKJANES RIDGE              

O: 30DEC2018 06:48:28  57.0N   34.1W mb=4.8  EMSC   REYKJANES RIDGE              

O: 30DEC2018 06:48:28  57.1N   34.0W mb=4.9  ANSS   REYKJANES RIDGE              

P: 30DEC2018 122422    59.0N   30.0W 4.0-5.9 ABBAA  North Mid-Atlantic Ridge   

 

The continuing eruption of Mt. Etna in Sicily, Italy is also located at 103 degrees from Mindanao. After a brief lull this eruption continued today. Earthquakes of M 2.9 and 2.9 were the largest associated seismic events. Forecast 122328 had expected this activity at the end of December.

 

O: 29DEC2018 23:36:21  37.7N   14.9E ML=2.9  EMSC   SICILY, ITALY                

O: 30DEC2018 03:12:14  37.7N   15.0E ML=2.9  EMSC   SICILY, ITALY                

O: 30DEC2018 02:53:20  37.7N   15.1E ML=2.2  EMSC   SICILY, ITALY                

P: 30DEC2018 122328    39.0N   15.0E 3.0-4.7 ABAAA  Mediterranean/Sicily       

 

The strongest earthquake in the U.S. or Canada today was an M 4.6 in the Gulf of Alaska aftershock series but is located about 150 km northeast of the main aftershock series which occurred following the M 8.0 ther in January, 2018. It was not reported felt. The last aftershock in this area of M>=4.6 within about 150 km of this epicenter was an M 4.9 on October 27, 2018 and prior to that another M 4.9 on August 25, 2018. Forecast 122438 had expected this event was likely around December 26.

 

 

O: 30DEC2018 00:36:16  56.4N  148.5W mb=4.6  EMSC   GULF OF ALASKA               

P: 26DEC2018 122438    55.2N  150.5W 3.2-5.1 BAAAA  Gulf of Alaska             

 

This high latitude seismic activation is probably due in part to the current geomagnetic storm which continued for a second day today. This is described as:

 

"The geomagnetic field saw minor storm conditions today. The AP level was 21. High latitude geomagnetic field also saw minor storm conditions  with AP at 06.  This continues the strongest geomagnetic storm in at least a month - since it reached 35 on November 5, 2018. Areas near the geomagnetic equator and at high latitudes are expected to see enhanced seismicity with this storm with the possibility of a strong to major earthquake. Mindanao, Philippines lies on the geomagnetic equator." (December 29-30, 2018)

 

The strongest earthquake in the world today occurred in the Hokkaido region

of Northern Japan with M 5.5. A series of earthquakes in the southern Kuril Islands and Hokkaido over the past week may preceded something a bit larger. The last event of M>=5.5 within about 200 km of today's epicenter was an M 6.6 on September 5, 2018 about 100 km to the west. An M 5.4-5.5 also occurred a month ago about a month ago on November 28 100 km to the south of today's epicenter.

Forecast 122376 had expected today's event in this region around December 27.

 

O: 29DEC2018 19:08:29  42.3N  143.1E mb=5.5  EMSC   HOKKAIDO, JAPAN REGION       

P: 27DEC2018 122376    43.0N  144.0E 3.5-5.5 AAAAA  Hokkaido, Japan            

 

MAJOR QUAKE HITS MINDANAO, PHILIPPINES AT LOCAL SOLAR NOON

 

EARTHQUAKE SUMMARY FOR DECEMBER 28, 2018

 

A major earthquake of M 7.0 (EMSC) - 7.2 (PHIVOLCS) hit the area of Mindanao, Philippines today. It occurred as Tropical Depression 35W was making landfall in Mindanao north of this epicenter and was almost certainly triggered by that landfall event. A further factor promoting the timing of this earthquake was high tidal stresses associated with the full moon. The earthquake occurred within a minute of local solar  noon, a time when tidal stresses are maximized. This summary had noted the occurrence and possibility of seismic triggering by TD 35W in previous issues as:

 

 

"TD 35W continued today northeast of the central Philippines with winds up to 35 kts. It is expected to track to the west passing over the Philippines around December 28. A moderate quake in this region today may indicate stresses associated with TD 35W are seismoactive in the region." (December 26, 2018)

 

The strength of the M 7.0 was probably brought about by a combination of stresses. Another factor promoting seismicity in Mindanao at this time was the occurrence of a geomagnetic storm, the strongest in nearly two months. This report summarized this storm as:

 

"The geomagnetic field saw minor storm conditions today. The AP level was 24. High latitude geomagnetic field also saw minor storm conditions  with AP at 26.  This is the strongest geomagnetic storm in at least a month - since it reached 35 on November 5, 2018. Areas near the geomagnetic equator and at high latitudes are expected to see enhanced seismicity with this storm with the possibility of a strong to major earthquake. Mindanao, Philippines lies on the geomagnetic equator. The M 7.0 there today occurred during today's geomagnetic storm and was probably promoted by it." (December 28, 2018)

 

NEIC reported today's earthquake was felt with intensity up to IV in Mindanao, Philippines at Santa Maria, Talicod, Samal, Buayan, Katangawan, Glan, Buihing, Balutalia, Davao and Digos, Southern Sumatra among other communities.

An aftershock of M 5.6 was reported by PHIVOLCS to have been felt with intensity II in Manay, Davao Oriental. Shallow focus earthquakes of M>=7 are generally responsible for minor tsunamis. But, as today's event is at an intermediate focus (66 km) a tsunami is unlikely and was not reported. An initial tsunami advisory had been issued by PTWC and local officials but was later dropped. Minor damage was expected but no major damage was reported due to the depth and location of this earthquake.

 

The last earthquake in southern Mindanao within about 250 km of today's epicenter with M>=7 occurred as an M 7.5 on March 5, 2002 and prior that an M 7.4 on January 1, 2001. Two other such earthquakes have hit the region in the past 30 years - an M 7.3 on May 17, 1992 and and M 7.0 on May 11, 1993. Local aftershocks up to M 6+ are expected over the next week. Far-field aftershocks area also likely. The distance near 103 degrees from Mindanao passes through central and Southern California. In 1992 the Landers quake in southern alifornia (M 7.6) hit a month after the M 7.3 quake in Mindanao near this distance and was probably promoted from it. Other areas near 103 degrees from today's epicenter in the Philippines include Sicily, Iceland and portioins of northwestern U.S as well as the Antarctic and East Pacific Rise. Areas at 144 degrees or nearby include the northern Caribbean, Panama and southern Chile as well as portions of the Central Mid-Atlantic ridge. These areas are particularly prone to seismic enhancement at this time. Forecasts 122232, 121953 and 122231 had expected a moderately strong to strong earthquake in Mindanao at the end of December within about 150-200 km of today's epicenter.  The Mindanao epicenter is at the seventh node (51 degrees) from the Loyalty Islands swarm and at the sixth node (60 degrees) from the last great global earthquake - an M 8.2 in Fiji and also at this distance from the M 7.3 in the Komandorsky Islands of December 20 and may have been promoted from those source.

 

PHIVOLCS reported it was felt with intensity V in Governor Generoso, Davao IOriental, Glan, Saranoani, Koronadal City, IV in General Santos City, Tupi, South Cotabato, Alabel, Sarangani, Kiamba and Malungon Sarangani, Mati City and Manay, Davao Oriental, Davao City, Rosario, Agusan Del Sur, Lebak and Kalamasigm Sultan Kudarat. Also felt with intensity III in Makilala, North Cotabto, Valencia City and Manolo Fortick, Budkinan and Cagayan De Oro City, Maitum, Sarangani, Tagum City, Mabini, Compostela Valley, Tacurong, City, Sta. Cruz, Davao del Sur; Don Marcelino, Davao Occidental, Kidapawan City, Tactoban City, Banga, South Cotabato, Palo, Leyte, Borobo Surigao del Sur, Bislig City, Hinatuan Surigao del Sur, Butuan City, II i Kadingilan and Don Carlos, Bukidnon, Tagoloan and El Salvador City, Misamis Oriental, M'lang and Tulunan, North Cotabato, Surallah, South Corabato, Surigao City, Iligan City, Cagwait, Surigao Del Sur, and intensity I in Zambonga City, Philippines.

 

O: 29DEC2018 03:39:10   6.0N  126.8E Mw=7.0  EMSC   MINDANAO, PHILIPPINES        

O: 29DEC2018 04:48:00   5.8N  126.7E ML=4.4  EMSC   MINDANAO, PHILIPPINES        

O: 29DEC2018 03:39:03  05.5N  127.1E MS=7.2  PHI  Felt with intensity V

O: 29DEC2018 04:29:01   5.9N  126.6E ML=4.6  EMSC   MINDANAO, PHILIPPINES        

P: 24DEC2018 122232     5.0N  125.0E 4.0-5.6 BABAA  Mindanao, Philippines      

P: 21DEC2018 121953     7.0N  126.0E 4.0-5.7 CAAAA  Central Philippines        

P: 29DEC2018 122231     9.0N  127.0E 4.0-5.7 ACAAA  Halmahera                  

 

A moderately large earthquake also occurred in the southern Kuril Islands today with M 5.5. It was not reported felt in this region. The aftershocks in the Komandorsky Islands to the north also continued and may have promoted this event in the Kuril Islands. Forecast 122402 had expected this event was likely within

about 150 km around December 29.

 

O: 28DEC2018 13:03:33  44.3N  148.6E Mw=5.5  EMSC   KURIL ISLANDS                

P: 29DEC2018

HIGH LATITUDES ACTIVE

 

EARTHQUAKE SUMMARY FOR DECEMBER 27, 2018

 

The strongest seismicity in the world today concentrated at high latitudes and included moderate to moderately large quakes in the Alaska aftershock Zone; the Kodiak Island area of Alaska; the South Sandwich Islands and Iceland among others.

 

The strongest earthquake in the U.S. or Canada today was an M 5.2 in the Alaska Peninsula. It was followed less than an hour later by an M 4.9 northwest of Anchorage. This is probably an aftershock of the M 7.1 of November 30, 2018. NEIC reported it was widely felt with maximum intensity IV in Anchorage, Elmendorf AFB, and Fort Richardson and as far as 200 km from the epicenter in Homer, Alaska. The last Anchorage aftershockof the November 30, 2018 mainshock of M 7.1 with M>=4.8 occurred on December 1, 2018 with M 5.2. Today's event is the strongest aftershock in the area in the long-term to date. Forecast 122433 had expected today's event was likely around December 24.

 

O: 27DEC2018 19:08:10  61.3N  150.1W ML=3.3  EMSC   SOUTHERN ALASKA              

O: 27DEC2018 22:00:49  61.3N  150.1W Ml=3.1  EMSC   SOUTHERN ALASKA              

O: 27DEC2018 14:21:11  61.3N  150.1W Mw=4.9  ANSS   SOUTHERN ALASKA              

O: 27DEC2018 14:21:11  61.3N  150.1W Mw=4.8  EMSC   SOUTHERN ALASKA              

O: 27DEC2018 22:09:45  61.4N  149.9W Ml=3.3  EMSC   SOUTHERN ALASKA              

P: 24DEC2018 122433    61.1N  150.2W 3.2-5.0 BAAAA  Central Alaska             

 

The last earthquake of M>=5.2 in the Kodiak Island, Alaska area of M>=5.2 occurred on May 11, 2018 (M 5.3) and prior to that May 11, 2017 (M 5.2). The last of significantly larger size was an M 6.8 on May 29, 2015. Today's event was not reported felt in this remote area Forecasts 122411 and 122438 had expected activity in this region was likely around December 25-26.

 

O: 27DEC2018 13:37:10  56.6N  154.9W mb=5.2  EMSC   KODIAK ISLAND REGION, ALASKA 

P: 25DEC2018 122411    54.8N  158.7W 3.5-4.9 ACBAA  Alaska Peninsula           

P: 26DEC2018 122438    55.2N  150.5W 3.2-5.1 ABCAA  Gulf of Alaska             

 

 

The alert status for Anak Krakatau has been raised. More than 20,000 are now in shelters and another tsunami is feared. Tolls continue to rise as rescuers reach remote areas.

 

The South Sandwich Islands remained activ today with three moderate quakes including two of M 5.1. These are not aftershocks, but occurred at a different epicenter from those which have recently hit the area. They were not reported felt in this remote area. Forecast 122504 had expected this activity was likely around December 27-28.

 

O: 27DEC2018 16:24:44  56.7S   24.4W mb=4.9  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 27DEC2018 11:25:33  56.7S   24.8W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

O: 27DEC2018 12:26:21  56.7S   24.8W mb=5.1  EMSC   SOUTH SANDWICH ISLANDS REGION

P: 27DEC2018 122504    56.0S   28.0W 4.0-6.1 AABAA  So. Sandwich Islands       

P: 28DEC2018 122504    58.0S   26.0W 4.0-5.6 ABAAA  So. Sandwich Islands       

 

On the other end of the Atlantic a moderate M 4.6-4.7 earthquake was lightly felt in Iceland. This continued activation of volcanic centers around the world over the past several days which included eruption of Etna, Sicily and Krakatau,

Sumatra, Indonesia. The last earthquake within about 250 km of today's Iceland epicenter  with M>=4.7 occurred June 14, 2018 also with N 4.7. The last such event of larger magnitude was an M 5.0 on February 19, 2018. Forecast 122439 had expected Iceland would be active at the end of December.

 

O: 28DEC2018 01:16:36  64.6N   17.8W mb=4.6  EMSC   ICELAND                      

O: 28DEC2018 01:38:17  64.7N   17.4W ML=3.2  EMSC   ICELAND                      

O: 28DEC2018 01:20:19  64.7N   17.4W ML=3.5  EMSC   ICELAND                      

O: 28DEC2018 01:16:36  64.6N   17.7W mb=4.7  ANSS   S of Akureyri Iceland        

P: 24DEC2018 122439    62.0N   27.0W 3.0-4.6 BCCAA  Iceland area               

 

Earthquakes of M 5.6 and 5.0 also occurred today in Venezuela. This was reported

in the previous summary issued yesterday as:

 

 

"A moderately strong earthquake of M 5.5 occurred today in northern Venezuela  NEIC reported it was felt with maximum intensity VI in Valencia, Venezuela and IV-V om Venezuela at Mariara, Tacangua, and Maracay and II-III in Goalgoaza, El Limon, Palo Negro, Turmero, Los Teguesnd Carrizal, Venezuela among other areas of northern Venezuela. It was followed by an aftershock of M 5.0, felt in the same general area. An M 3.7 foreshock hit south of the mainshock earlier in the day and was felt lightly in the epicentral area. There was no reported major damage, casualties or tsunami with theses earthquakes. The mainshock of M 5.5 is the strongest within about 200 km  of this epicenter since an M 5.5 on February 19, 2014. The last such earthquake with greater magnitude was an M 6.3 near today's epicenter on September 12, 2009 Forecast 121963 had expected this event about 200 km to the southeast was likely towards the end of December. The foreshock of M 3.7 had been expected within about 50 km towards the end of December. This epicenter is in the antipodal region of Java, Indonesia where tolls from a major tsunami surpass 430 and are still being updated. It is also in the antipodal region of Lombok, Indonesia where a major tsunami and earthquake struck in August 2018." (December 27, 2018)

 

O: 27DEC2018 09:24:20  10.3N   68.0W mb=5.0  EMSC   CARABOBO, VENEZUELA          

O: 27DEC2018 08:59:11  10.3N   68.1W Mw=5.5  EMSC   CARABOBO, VENEZUELA          

P: 21DEC2018 121963     9.0N   70.0W 4.0-5.5 CBBAA  Venezuela                   

 

The strongest earthquake in the world today was an M 5.8 in northern Papua New

Guinea. It was not reported felt and did not generate a tsunami. The last earthquake with M>=5.8 within about 400 km of this epicenter was an M 5.8 on April 1, 2015 also with M 5.8. The only significantly larger event in this area in the past 30 years was an M 6.4 on Aril 4, 2001.. No earthquakes of M>=5.8 have occurred within 300 km of this epicenter in the past 30 years. This is a region where a strong earthquake can and has triggered destructive tsunami waves.  Foredast 122262 had expected this activity was likely around December 26.

 

O: 28DEC2018 03:03:33   1.5S  134.1E Mw=5.8  EMSC   NEAR N COAST OF PAPUA, INDONES

P: 26DEC2018 122262     1.0S  133.0E 4.0-5.6 AAAAA  West Irian, PNG            

P: 26DEC2018 122262     3.0S  134.0E 4.0-5.6 ABAAA  West Irian, PNG            

 

 

MODERATE EARTHQUAKES SHAKE NORTHERN VENEZUELA

 

EARTHQUAKE SUMMARY FOR DECEMBER 26, 2018

 

A moderately strong earthquake of M 5.5 occurred today in northern Venezuela. NEIC reported it was felt with maximum intensity VI in Valencia, Venezuela and IV-V in Venezuela at Mariara, Tacangua, and Maracay and II-III in Goalgoaza, El Limon, Palo Negro, Turmero, Los Teguesnd Carrizal, Venezuela among other areas of northern Venezuela. It was followed by an aftershock of M 5.0, felt in the same general area. An M 3.7 foreshock hit south of the mainshock earlier in the day and was felt lightly in the epicentral area. There was no reported major damage, casualties or tsunami with theses earthquakes. The mainshock of M 5.5 is the strongest within about 200 km  of this epicenter since an M 5.5 on February 19, 2014. The last such earthquake with greater magnitude was an M 6.3 near today's epicenter on September 12, 2009. Forecast 121963 had expected this event about 200 km to the southeast was likely towards the end of December. The foreshock of M 3.7 had been expectedd within about 50 km towards the end of December. This epicenter is in the antipodal region of Java, Indonesia where tolls from a major tsunami urpass 430 and are still being updated. It is also in the antipodal region of Lombok, Indonesia where a major tsunami and earthquake struck in August 2018. A moderate aftershock in that region was also recorded and felt today. This activity is near the third node (120 degrees) from the strong Loyalty Islands quakes of early December and may have been promoted from that source. It is more likely however, that a trigger for this activity in Venezuela was the M 7.3 in the Komandorsky Islands of December 20. The distance between these epicenters is 101-102 degrees. Following strong earthquakes refracted and reflected body waves return in a concentrated bundle in the region 101-104 degrees from the mainshock and can help trigger additional seismicity at that distance.

 

 

O: 27DEC2018 08:59:11  10.3N   67.9W mw=5.5  ANSS   San Diego Venezuela          

O: 27DEC2018 09:24:20  10.3N   68.0W mb=5.0  ANSS   San Diego Venezuela          

P: 21DEC2018 121963     9.0N   70.0W 4.0-5.5 CBBAA  Venezuela                  

 

O: 26DEC2018 18:17:00   8.8N   70.6W ML=3.7  EMSC   BARINAS, VENEZUELA           

P: 21DEC2018 121963     9.0N   70.0W 4.0-5.5 BAAAA  Venezuela                  

 

NEIC reported the earthquake of M 4.6 in Lombok, Indonesia was felt with intensity II-III in the area(s) of Mataram, Indonesia. Forecast 122261 had expected activity in this area around December 24.

 

O: 26DEC2018 12:22:25   8.4S  116.7E mb=4.6  EMSC   LOMBOK REGION, INDONESIA     

P: 24DEC2018 122261     8.0S  118.0E 4.0-5.4 AAAAA  Sumbawa Island area        

 

The strongest earthquake in the world today was an M 5.6 in Tonga. NEIC reported it was felt with intensity III in Neiafu and Vaini Tongatapu, Tonga. Thio is the strongest earthquake in eastern Tonga within about 150 km of this epicenter since an M 6.4 on September 24, 2016. An M 6.1 occurred about 200 km

to the south more recently on October 8, 2017. Forecast 122463 had expected it within about 150 km likely around December 29.

 

O: 26DEC2018 14:11:17  17.2S  174.1W Mw=5.8  EMSC   TONGA                        

P: 29DEC2018 122463    16.0S  175.0W 4.0-5.9 BBAAA  Tonga Islands              

 

Activity in the Mt. Etna eruption was down today. The strongest associated

earthquake of M 3.5 and few events of M>=2.5 occurred today.

 

O: 26DEC2018 17:48:10  38.6N   14.9E ML=3.5  EMSC   SICILY, ITALY                 

O: 27DEC2018 00:56:12  37.7N   14.7E ML=2.4  EMSC   SICILY, ITALY                

P: 22DEC2018 122048    39.0N   15.0E 3.0-4.6 BBAAA  Mediterranean/Sicily       

 

 

 

 

 

 

EARTHQUAKES; ERUPTION CONTINUE IN SICILY, ITALY

 

EARTHQUAKE SUMMARY FOR DECEMBER 25, 2018

 

The major eruption of Mt. Etna in Sicily contineud today. The largest associated earthquake was an M 5.1 felt with intensity up to VII in Viagrande and VI in Catania Sicilien. Lesser shaking was felt throughout the area of Sicily especially at Aci Bonaccorsi and San Gregorio with intensity IV. Other areas reporting moderate shaking of II-III included Aci Catena, Gravina di Catania, Tremestieri Etna, and Belpasso, Sicily.  Lighter earthquakes were also felt in Sicily today. This reported summarized this activity in the previous issue as:

 

 

"A strong eruption of Mt. Etna in Sicily, Italy occurred today following a

series of moderate earthquakes in the area. No tsunami was reported or expected but volcanic eruptions can cause local tsunamis. The eruption included lava flows and steam and ash thrown high in the air. Strong eruptions at Etna have occasionally be followed by unusual seismicity in Central California in the next week. There were no reports or damage or casualties from today's eruption or earthquakes. Etna is an active volcano but today's eruption was especially vigorous. The strongest of the associated earthquakes was an M 4.3. Earthquakes in this region are common but usually smaller than M 4.0. The last event of M>=4.3 within about 150 km of this epicenter was an M 4.6 on October 6, 2018, the only  significantly larger event in the area since an M 4.6 on February 8, 2016.  NEIC reported today's earthquake of M 4.3 in Sicily,, Italy was felt with intensity II-III in the area(s) of Piedimonte Etnas, Ao Calera, and Catania, Italy.  Forecast 122048 had expected a moderate swarm in the region of Sicily was likely around December 22. This epicenter is located at 102-103 degrees from the M 7.1 in the South Sandwich Islands of December 11 and was probably promoted by concentrated energy from that event After major earthquakes energy is reflected and refracted off the core-mantle boundary and and reaches the surface in this distance range, often with a subsequent increase in zonal seismicity at about 103 degrees." (December 25, 2018)

 

The strongest earthquake in Sicily, and the most deadly, also occurred in  late December - on December 28, 1908, 110 years ago. This was one of the most deadly earthquakes in recent times in Europe. This reported summarized this event as follows in previous issues:

 

"12 28  4 20 27 1908  38.167   15.583  10 7.5   Mediterranean/Sicily

 

An earthquake in Messina, Italy and Reggio. At Messina 2400 were killed outside the city in the province of Reggio about 11,000 were killed at Monteleone, 10 - a total of 13,282. About 25-50% of the population of the nearby towns were killed. Estimated total death toll was 47,000 to 82,000 people. Many houses in every village were destroyed. Destruction was complete near the epicenter. At Messina about 98% of houses were ruined. The city looked like rows of debris. The quake was felt as far as Greece for an area of about 170,000 sq. miles. Subsidence of the coast was up to 3 feet.  Sea cables were ruptured most of the was between Sicily and Italy. A tsunami was generated with an intial retreat of the sea. Maximum tsunami height was 38 feet. On both sides of the strait of Messina buildings were swept away be the tsunami. 79 were killed or drowned in the tsunami at Sicily and more than 140 on the Calabrian coast. The tsunami destroyed bridges and railways." (December 28, 2017)

 

The last earthquake at a shallow focus in the region of Sicily occurred as an M 5.3 on October 25, 2012 and prior to that as an M 6.0 east of Sicily on September 6, 2002. Forecast 122048 had expected today's activity wqas likely around December 22 in the area of Sicily.

 

O: 26DEC2018 02:19:16  37.6N   15.1E mb=5.1  EMSC   SICILY, ITALY                 

P: 22DEC2018 122048    39.0N   15.0E 3.0-4.6 BBAAA  Mediterranean/Sicily       

 

The tolls in the Indonesian tsunami of December 22 continued to rise today as rescuers arrive in areas previously inaccessible. Much of eastern Java was affected by the tsunami which was probably generated by mass movements associated with eruptions of Krakatau Volcano and tidal effects off eastern Sumatra. More than 430 confirmed deaths and 120 still missing are the latest figures. Fourteen year ago a massive tsunami in Sumatra, Indonesia occurred on December 26 with waves that killed more than a quarter million around the Indian Ocean.  The tidal forecast for the area in this summary had noted in summaries

prior to the tsunami:

 

"The full moon will arrive at 17:49 UT on December 22. Longitudes experiencing maximum tidal stresses at this time are near 90 West and 90 East longitude and include Central America, the Central U.S. and in the east Sumatra and Indonesia among others. Tidal triggering is most likely in these regions but can occur in any area near rupture increasing maximum magnitude by up to about 0.4. This is sufficient to turn a  large quake into a strong quake." (December 20-22, 2018)

 

STRONG SEISMICITY CONTINUES IN KOMANDORSKY IS; ERUPTION HITS SICILY, ITALY

 

EARTHQUAKE SUMMARY FOR DECEMBER 24, 2018

 

Aftershocks in the Kamchatka/Komandorsky Islands continued today at high levels. The strongest earthquake in the world today was in this region with M 6.1. The mainshock  was an M 7.3 on December 20, 2018 but today's M 6.1 is the strongest aftershock to date. Forecast 122419 had expected today's activity was likely around December 24-27 with moderately large aftershocks likely at this time.

As the mainshock of M 6.1 occurred within minutes of local solar midnight, tidal stresses were also a promotional factor.

 

O: 25DEC2018 03:11:05  54.4N  164.2E mb=4.8  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 24DEC2018 11:15:24  54.5N  164.3E mb=4.4  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 24DEC2018 12:55:55  54.5N  164.3E mb=4.7  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 24DEC2018 10:41:39  54.6N  164.2E Mw=5.4  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 24DEC2018 08:43:20  54.7N  164.1E mb=4.8  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 24DEC2018 13:21:35  54.8N  164.1E mb=5.0  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 24DEC2018 09:09:38  54.9N  164.5E mb=4.4  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 24DEC2018 15:25:17  55.2N  164.2E mb=4.7  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 24DEC2018 12:05:47  55.3N  164.5E mb=4.7  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 24DEC2018 12:34:55  55.4N  164.2E mb=4.6  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 24DEC2018 12:41:19  55.4N  164.5E Mw=6.1  EMSC   KOMANDORSKIYE OSTROVA REGION

O: 24DEC2018 17:43:35  55.6N  162.9E mb=4.6  EMSC   NEAR EAST COAST OF KAMCHATKA 

P: 24DEC2018 122419    56.0N  163.0E 4.0-5.7 AAAAA  Komandorsky Isl            

P: 26DEC2018 122419    55.0N  163.0E 4.0-5.7 AAAAA  Komandorsky Isl            

P: 27DEC2018 122419    55.0N  164.0E 4.0-5.7 BAAAA  Komandorsky Isl            

 

A strong eruption of Mt. Etna in Sicily, Italy occurred today following a  series of moderate earthquakes in the area. No tsunami was reported or expected but volcanic eruptions can cause local tsunamis. The eruption included lava flows and steam and ash thrown high in the air. Strong eruptions at Etna have occasionally be followed by unusual seismicity in Central California in the next week. There were no reports or damage or casualties from today's eruption or earthquakes. Etna is an active volcano but today's eruption was especially vigorous. The strongest of the associated earthquakes was an M 4.3. Earthquakes in this region are common but usually smaller than M 4.0. The last event of M>=4.3 within about 150 km of this epicenter was an M 4.6 on October 6, 2018, the only  significantly larger event in the area since an M 4.6 on February 8, 2016.  NEIC reported today's earthquake of M 4.3 in Sicily,, Italy was felt with intensity II-III in the area(s) of Piedimonte Etnas, Ao Calera, and Catania, Italy.  Forecast 122048 had expected a moderate swarm in the region of Sicily was likely around December 22. This epicenter is located at 102-103 degrees from the M 7.1 in the South Sandwich Islands of December 11 and was probably promoted by concentrated energy from that event After major earthquakes energy is reflected and refracted off the core-mantle boundary and and reaches the surface in this distance range, often with a subsequent increase in zonal seismicity at about 103 degrees. The beginning of this appears to be related to tidal stresses as it starts about local solar noon, a prime time for maximum tidal stresses.

 

O: 24DEC2018 16:50:13  37.6N   15.4E mb=4.3  EMSC   SICILY, ITALY                 

O: 24DEC2018 11:01:50  37.7N   15.0E ML=3.9  EMSC   SICILY, ITALY                

O: 24DEC2018 12:08:55  37.7N   15.0E ML=4.0  EMSC   SICILY, ITALY                

O: 24DEC2018 19:26:18  37.7N   15.0E ML=4.0  EMSC   SICILY, ITALY                 

P: 22DEC2018 122048    39.0N   15.0E 3.0-4.6 ABAAA  Mediterranean/Sicily       

 

A moderate M 4.7 earthquake shook regions of Puerto Rico today. NEIC reported intensity II-III in Puerto Rico at Aquadilla, Oltra Banda La Altagracia, Anasco, Mayaguez, San Juan, El Carril, El Llano and others. This continues a regional activation involving Puerto Rico, the Virgin Islands and the Dominican Republic which has been ongoing over the past week. Larger regional earthquakes often hit the region in December and January, so further such events are still likely. The last earthquake with M>=4.7 within about 100 km of this epicenter in Puerto Rico was an M 4.7 on December 7, 2018 and prior to that an M 4.8 on August 18, 2017. The last of larger magnitude was an M 5.8 on May 28, 2014.  Forecast 122292 had expected this event was likely in this area around December 24.

 

O: 25DEC2018 03:46:14  19.2N   67.6W mb=4.7  EMSC   PUERTO RICO REGION           

P: 24DEC2018 122292    19.0N   69.0W 3.4-4.9 AAAAA  Puerto Rico                 

 

Death and other tolls from the Indonesia tsunami of December 22 continued to rise today as rescue workers reached previously unreached areas of devastation. Much of the western coastline of Java was affected by the tsunami. Tolls are expected to continue to rise. The region is in the rainy season and access to many areas is restricted by rains floods and other waters. Currently 429  re known dead from the tsunami with an additional 120 still unaccounted for.

 

The warm of moderate quakes southeast of eastern Honshu, Japan also continued

today. The largest wer of M 5.2 and 4.7 and 4.7. This summary noted in the

previous issue in this regard:

 

 

"A series of moderate earthquakes with maximum size 5.5 and 5.6 also occurred today southeast of Tokyo, Japan. These represent an unusual epicenter and may indicate a change in the stresses in the area. This inturn, may bring the large earthquake  in tokyo which is expected soon, closer in time. Like the unusual activity in Central California this is located at 34 north latitude, probably just a  coincidence. The last earthquake within about 100 km of these epicenters with M>=5.6 occurred on September 23, 2016 with M 6.2.  Forecasts 122079 and 122337 had expected this activity in this area was likely between December 21 and 24. This activity is at the seventh node (51 degrees) from Anchorage, Alaska M 7.1 of November 30 and the sixth node (60 degrees) from the Loyalty Islands and was probably promoted from those ources." (December 24, 2018)

 

O: 25DEC2018 00:10:30  34.0N  141.6E Mw=5.2  EMSC   OFF EAST COAST OF HONSHU, JAPA

O: 24DEC2018 23:20:02  34.0N  141.6E mb=4.7  EMSC   OFF EAST COAST OF HONSHU, JAPA

O: 24DEC2018 09:13:48  34.1N  141.7E mb=4.7  EMSC   OFF EAST COAST OF HONSHU, JAPA

P: 24DEC2018 122337    34.0N  140.0E 4.0-5.6 AAAAA  Off East Coast Honshu      

P: 28DEC2018 122337    35.0N  142.0E 4.0-5.7 BAAAA  Off East Coast Honshu      

 

The strongest earthquake in the U.S. or Canada today was an M 3.8 in the Anchorage, Alaska aftershock zone. The area has been relatively quiet in recent days with the last event of M>=3.8 in this aftershock zone an M

Forecast 122433 had expected today's epicenter would be active around December 24.

 

O: 24DEC2018 20:46:13  61.5N  149.9W Ml=3.8  EMSC   SOUTHERN ALASKA               

P: 24DEC2018 122433    61.1N  150.2W 3.2-5.0 AAAAA  Central Alaska             

 

STRONG QUAKE FELT IN TONGA; MODERATE SWARM SOUTHEAST OF TOKYO, JAPAN

 

EARTHQUAKE SUMMARY FOR DECEMBER 23, 2018

 

A strong earthquake of M 6.4 was felt in Tonga today. NEIC reported it was felt with intensity II-III in Tong at Nuku'alofa; in Tubou, Fiji and in Utulaelae, Samoa. This is the strongest earthquake within about 200 km of this epicenter in eastern Tonga since an M 6.4 on September 24, 2016 (M 6.4). The last such quake of larger magnitude was an M 6.7 on April 28, 2012.  Forecast 122478 had expected this event was likely in Tonga around December 25. It is likely that it was promoted by tidal stresses as it occurred within about half an hour of local solar noon, and was nearly sub-solar at the time of the earthquake. Tidal stresses maximize at local noon and midnight.

 

O: 24DEC2018 01:00:52  20.2S  175.3W mb=5.0  EMSC   TONGA                        

O: 23DEC2018 23:08:42  20.3S  175.4W Mw=6.4  EMSC   TONGA                        

P: 25DEC2018 122478    21.0S  178.0W 4.0-5.7 AABAA  Tonga Islands               

 

An unusual M 3.4 earthquake occurred today off the coast of southern Central California. NEIC reported it was felt with intensity II-III in Santa Maria, Nipono, Buellton, Lomboc, Arroyo Grande, Oceano and Santa Ynez among others within about 50 km of the epicenter. This is the strongest earthquake within about 50 km of this epicenter since an M 3.8 on January 7, 2018 and prior to that an M 4.3 on October 26, 2017. Forecast 122339 had expected this event was likely around December 24.

 

O: 23DEC2018 18:04:34  34.9N  120.4W ML=3.3  EMSC   CENTRAL CALIFORNIA           

O: 24DEC2018 03:16:47  34.9N  120.4W Ml=2.4  EMSC   CENTRAL CALIFORNIA           

P: 24DEC2018 122339    34.8N  121.3W 2.5-4.4 AAAAA  Off So. California         

 

Tolls continued to rise in the deadly tsunami in Sumda Indonesia which occurred

on December 22. An eruption of Krakatau was reported (with picures on the internet) about an hour before the tsunami and was probably the tsunami generator. More such tsunamis are possible as this eruption continues. Sunda is located across the strait from  eastern Sumatra in Indonesia at about  5S 104-105E latitude and longitude. The eruption which coincided with the full moon was probably promoted by tidal effects from the full moon as noted in previous issues of this summary:

 

"The full moon will arrive at 17:49 UT on December 22. Longitudes experiencing maximum tidal stresses at this time are near 90 West and 90 East longitude and include Central America, the Central U.S. and in the east Sumatra and Indonesia among others. Tidal triggering is most likely in these regions but can occur in any area near rupture increasing maximum magnitude by up to about 0.4. This is sufficient to turn a  large quake into a strong quake." (December 21-24, 2018)

 

A series of moderate earthquakes with maximum size 5.5 and 5.6 also occurred today southeast of Tokyo, Japan. These represent an unusual epicenter and may indicate a change in the stresses in the area. This inturn, may bring the large earthquake in Tokyo which is expected soon, closer in time. Like the unusual activity in Central California this is located at 34 north latitude, probably just a  coincidence. The last earthquake within about 100 km of these epicenters with M>=5.6 occurred on September 23, 2016 with M 6.2.  Forecasts 122079 and 122337 had expected this activity in this area was likely between December 21 and 24. This activity is at the seventh node (51 degrees) from Anchorage, Alaska M 7.1 of November 30 and the sixth node (60 degrees) from the Loyalty Islands and was probably promoted from those ources.

 

O: 24DEC2018 00:43:11  34.1N  141.7E Mw=5.5  EMSC   OFF EAST COAST OF HONSHU, JAPA

O: 24DEC2018 00:18:06  34.1N  141.8E Mw=5.6  EMSC   OFF EAST COAST OF HONSHU, JAPA

O: 24DEC2018 03:00:20  34.1N  141.8E mb=4.7  EMSC   OFF EAST COAST OF HONSHU, JAPA

O: 24DEC2018 05:42:40  34.2N  141.5E mb=4.6  EMSC   OFF EAST COAST OF HONSHU, JAPA

P: 21DEC2018 122079    34.0N  143.0E 4.0-5.4 BABAA  So. of Honshu              

P: 24DEC2018 122337    34.0N  140.0E 4.0-5.6 AABAA  Off East Coast Honshu      

 

Aftershocks in the Komandorsky Islands extended into the area east of the coast of Kamchatke todar with moderate quakes in that area of M 4.4 and 4.6. Moderate aftershocks also continued in the Komandoraky area with events of M 4.7 and 4.8 among others. Forecasts 122416 and 122419 had expected this activity at the end of December.

 

O: 23DEC2018 23:52:19  54.5N  164.2E mb=4.8  EMSC   KOMANDORSKIYE OSTROVA REGION 

O: 24DEC2018 05:05:30  54.7N  164.5E mb=4.4  EMSC   KOMANDORSKIYE OSTROVA REGION 

O: 23DEC2018 15:41:04  54.8N  164.4E mb=4.3  EMSC   KOMANDORSKIYE OSTROVA REGION 

O: 23DEC2018 10:57:48  54.8N  164.5E mb=4.7  EMSC   KOMANDORSKIYE OSTROVA REGION 

P: 25DEC2018 122416    54.0N  162.0E 4.0-5.6 AABAA  E. of Kamchatka            

P: 27DEC2018 122419    55.0N  164.0E 4.0-5.7 BAAAA  Komandorsky Isl            

 

O: 23DEC2018 09:02:42  55.2N  162.5E mb=4.4  EMSC   NEAR EAST COAST OF KAMCHATKA 

O: 23DEC2018 14:34:24  55.2N  163.1E mb=4.6  EMSC   OFF EAST COAST OF KAMCHATKA  

P: 24DEC2018 122419    56.0N  163.0E 4.0-5.7 AAAAA  Komandorsky Isl            

P: 26DEC2018 122419    55.0N  163.0E 4.0-5.7 BAAAA  Komandorsky Isl            

 

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