STRONG EARTHQUAKE WIDELY FELT IN BRITISH COLOMBIA AND WASHINGTON STATE

 

EARTHQUAKE SUMMARY FOR APRIL 23, 2014

 

A strong earthquake of M 6.6 hit the Vancouver Island region of British Columbia today and was widely felt in British Columbia and Washington State, U.S.  This event at high latitude coming four days after a major geomagnetic storm was probably promoted by that storm. A global seismic watch was called four days ago in connection with this geomagnetic disturbance as follows:

 

"The global seismic watch associated with the current unrest in the geomagnetic field is most likely to see a strong or major global earthquake around April 26. As much of the available seismic energy has been used up in the past three weeks as areas ready to rupture have done so by triggering from other earthquakes, the strength of this global seismic watch period is likely to be on the low end with maximum magnitudes in the  M 6.0-6.5 range." (April 21-24, 2014)

 

NEIC reported this event was felt in Canada with intensity IV in Gold River, Port Hardy, and II-III in Abbotsford, Aldergrove, Burns Lake, Campbell River, Chilliwack, Courtney, Cowichan Valley, Cultus Lake, Cumberland, Duncan, Kamloops, Keona, Kitmat, Nanamo, Parksville, Port Albemi, Port MacNell Powell River, Prince George, Quensi, Sechelt, Smithers, Squamish, Terrace, Ucluelet, Vancouver, Victoria, Walnut Grove, White Rock and Williams Lee, British Columbia, Canada. In Washington State, U.S. it was felt with intensity IV in Mount Vernon, and II-III in Auburn, Federal Way, Bellevue, Kent, Lynnwood, Medina, Mountain Terrace, Redmond, Lynnwood, Seattle, Anarcotes, Bellingham, Blaine, Bow, Burlington, Everson, Friday Harbor, Lyndon, Mount Vernon, Point Roberts, Sultan, Gig Harbor, Hansville, Puyallup, Stellacoom, Olympia, Battle Ground and Camas, Washington. More than 625 people reported to NEIC feeling this earthquake. An aftershock of M 5.0 was felt with intensity II-III in British Columbia in Courtenay, Duncan, Kamloops, Stechett, and Walnut Grove. An M 4.2 was felt with intensity IV in British Columbia in Vancouver and II-III in Campbell river, Courtenay, Penticton, Powell River, and Walnut Grove and in Washington at Redmond and Seattle with intensity II-III. There were no immediate reports of significant damage or casualties. No tsunami was expected or observed. This is the strongest earthquake to hit within 150 km of this epicenter since an M 6.6 on November 2, 2004. There have been no other such events at this magnitude or larger in the area in the past 25 years.

 

There were some precursory signs as noted in this summary yesterday. A unusual series of event occurred to the west of this. This was noted in this summary

as follows in the previous summary:

 

"The strongest earthquakes in North America today were a series of six events west of Vancouver Island, British Colombia in the northeastern Pacific of M 4.3-4.4. This may be a volcanic episode in this offshore region. These earthquakes are not being felt as this area is 500 km west of the nearest land. But they could represent seismic triggering of a volcanic vent system by waves from the M 7.4 in Mexico. This activity began shortly after that large Mexican earthquake at a distance of 45 degrees from it - the eighth node." (April 22-23, 2014)

 

The earthquake in Vancouver today is also at a distance (40 degrees - node 9) which would suggest promotion from the Mexican earthquake. An interesting aspect to the distances relation for this event is that it lies near the 90 degree distance (node 4) from most of the great earthquakes of the past month -

New Guinea, the Solomon Islands and the events off northern Chile. Constructive interference is a likely triggering influence for this event as well. In addition a strong spring storm was racing up the Atlantic coast of the U.S. at the time of this earthquake in Vancouver. This is a situation very much like that which preceded the M 7.7 in the Queen Charlotte Islands in October, 2012 as Hurricane Sandy did massive damage to the central east coast of the U.S. This summary has documented this relation with strong storms and major earthquakes in  the British Columbia region on many previous occasions.

 

Forecast 79813 had expected this earthquake within about 100 km of the epicenter with magnitude (corrected) up to M 6.1 to occur around April 24.

 

O: 24APR2014 03:10:12  49.8N  127.4W mw=6.6  ANSS   Port Hardy Canada

O: 24APR2014 03:20:14  49.9N  127.2W mb=5.0  ANSS   Port Hardy Canada

O: 24APR2014 05:16:21  50.0N  127.3W mb=4.2  ANSS   Port Hardy Canada

O: 24APR2014 03:10:10  49.7N  127.6W ML=6.8  AUS    Vancouver Island, Canada.

O: 24APR2014 03:10:10  49.6N  127.7W ML=6.6  NRCA   W of Gold River, BC, Canada.

O: 24APR2014 03:40:56  49.6N  127.7W ML=4.6  NRCA   W of Gold River, BC, Canada.

O: 24APR2014 03:44:17  49.6N  127.8W ML=4.8  NRCA   W of Gold River, BC, Canada.

O: 24APR2014 04:28:23  49.5N  127.7W ML=3.5  NRCA   W of Gold River, BC, Canada.

O: 24APR2014 05:16:17  49.6N  127.8W ML=4.3  NRCA   W of Gold River, BC, Canada.

O: 24APR2014 03:41:01  49.8N  127.4W Ml=4.2  ANSS   Port Hardy Canada            

P: 24APR2014 79813     49.0N  126.0W 2.8-6.1 AAAAA  Vancouver Island area      

 

The most unusual earthquake in the U.S. today occurred near Lincoln, Montana with M 3.5. This is an area which often sees unusual activity just prior to large earthquakes along the North American and Pacific Plate boundary. This is the strongest earthquake to hit within 100 km of this epicenter since an M 3.7 on January 16, 2011. Forecast 79816 had expected today's event to occur today (April 24) about 50-100 km to the southeast of this epicenter.

 

NEIC reported this earthquake of M 3.5 in Western Montana was felt with intensity II-III in the area(s) of Great Falls, Fort Benton, Helena, Clancy, Lincoln, Butte, Anaconda and Ovando, Montana.

 

O: 23APR2014 14:41:58  46.9N  112.6W mc=3.5  ANSS   ESE of Lincoln Montana       

O: 23APR2014 14:41:58  46.9N  112.6W ML=3.5  UUSN     Lincoln, MT

P: 24APR2014 79816     46.4N  111.4W 2.0-4.1 AAAAA  Yellowstone/Wyoming        

 

Today's earthquake and forecast map follows. Stippled White areas are nodal distances (360/n, n an integer) from the M 6.6 earthquake off Vancouver Island, B.C., Canada where promoted seismicity is possible.

 

 

OTHER GLOBAL EARTHQUAKE ACTIVITY

 

For most events there are two listings. The first line is the observed event starting with "O:" for Observed. There follows the date, month and year, the time in UT hours:minutes:seconds, the latitude and longitude, the given magnitude and the reporting agency followed by the geographic location. The second line starts with "P:" This is the forecast event as forecast in our summaries normally more than a month in advance. Magnitudes may vary in response to updated seismic watches and daily variations due to tidal and other influences. This line has the forecast date, month and year, the forecast number, latitude, longitude and forecast magnitude range.  This is followed by a comparison between the forecast and the event. The comparison includes letters A-D. The first is number of days difference from predicted (A:up to 2, B3-5; C:6-10; D:more than 10), Difference in latitude (A:up to 1 degree; B:1-2 degrees; C:2-4 degrees; D:more than 4 degrees); longitude (same comparison as with latitude); magnitude (A: within forecast range; B: higher than forecast range; C: lower than forecast range; D: no comparison possible). The last letter is a stand in for a future comparison which needs to be done statistically after a large number of forecasts have been made. In previous data, an excellent match is generally AAAAA; a good match as one or two B's; a fair match has several B's and C's and a poor match is one which contains a number of C's or D's. 

 

ASIA

 

O: 23APR2014 12:42:46  56.8N  129.0E mb=4.6  EMS SOUTHWESTERN SAKHA, RUSSIA      

 

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

 

INDONESIA AND PHILIPPINES

 

O: 23APR2014 13:12:26   0.6S  127.4E mb=4.6  ANSS   NNW of Laiwui Indonesia      

P: 22APR2014 79663      0.0N  126.0E 4.0-5.4 AABAA  Mindanao, Philippines      

 

O: 23APR2014 16:18:33   5.5N  123.9E mb=4.4  ANSS   SSW of Palimbang Philippines 

P: 25APR2014 79664      6.0N  125.0E 4.0-5.4 AAAAA  Mindanao, Philippines      

 

O: 23APR2014 14:38:25   3.4S  135.4E ML=4.3  EMS PAPUA, INDONESIA                

P: 22APR2014 79687      4.0S  136.0E 4.0-5.5 AAAAA  West Irian, PNG            

 

O: 23APR2014 21:30:53   7.6S  124.5E ML=4.3  EMS BANDA SEA                       

P: 29APR2014 79668      8.0S  125.0E 4.0-5.4 CAAAA  Banda Sea                  

 

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

 

CENTRAL AND SOUTH AMERICA

 

O: 23APR2014 07:18     15.5S   73.2W mb=4.0  IGP    NE of Caraveli,  Peru.       

P: 24APR2014 79849     15.0S   73.0W 4.0-5.5 AAAAA  Central Peru               

 

O: 23APR2014 18:15     25.8S   70.8W mb=4.5  IGP    Chanaral; II Copiapo, Tierra A

P: 30APR2014 79863     26.0S   71.0W 4.0-5.4 CAAAA  Coast Central Chile        

 

CSN reported this earthquake was felt with intensity III in Chanaral and II in Copiapo and Tierra Amarilla, Chile.

 

O: 23APR2014 18:56:42  12.0N   87.8W mb=4.4  ANSS   SW of Corinto Nicaragua      

P: 30APR2014 79706     14.0N   88.0W 3.5-5.1 CBAAA  Nicaragua                  

 

O: 24APR2014 03:54:23  18.4N   69.0W Md=3.5  ANSS   La Romana Dominican Republic 

O: 23APR2014 15:59:21  18.8N   68.2W Md=3.4  ANSS   Punta Cana Dominican Republic

P: 24APR2014 79711     19.0N   69.0W 3.4-4.9 AAAAA  Puerto Rico                

 

O: 23APR2014 08:20:43  18.9N   64.3W Md=3.4  ANSS   Town British Virgin Islands  

O: 23APR2014 06:14:59  19.3N   66.0W Md=3.0  ANSS   San Juan Puerto Rico         

O: 23APR2014 15:37:49  19.7N   65.2W Md=3.2  ANSS   Amalie U.S. Virgin Islands   

P: 29APR2014 79714     20.0N   66.0W 3.0-4.4 CAAAA  Bahamas/No. Caribbean      

 

O: 24APR2014 04:56:49  20.1S   70.8W mb=4.8  ANSS   W of Iquique Chile           

P: 21APR2014 79862     20.0S   70.0W 4.0-5.5 BAAAA  Argentina                  

P: 22APR2014 79857     19.0S   70.0W 4.0-5.4 AAAAA  So. Peru/Bolivia           

 

 

O: 23APR2014 18:15:16  25.8S   70.8W mw=4.2  ANSS   SW of Taltal Chile           

P: 30APR2014 79863     26.0S   71.0W 4.0-5.4 CAAAA  Coast Central Chile        

 

O: 23APR2014 04:46:27  17.3N  101.1W ML=3.4  UNAM   SURESTE de PETATLAN, GRO 

O: 23APR2014 09:57:57  17.4N  101.2W ML=3.2  UNAM   SURESTE de PETATLAN, GRO 

O: 23APR2014 08:38:13  17.5N  101.2W ML=3.6  UNAM   STE de PETATLAN, GRO 

O: 23APR2014 07:10:17  17.3N  101.2W ML=3.6  UNAM   SURESTE de PETATLAN, GRO 

O: 23APR2014 10:57:45  17.5N  101.4W ML=3.0  UNAM   ESTE de PETATLAN, GRO 

O: 23APR2014 04:46:47  17.7N  101.4W ML=3.0  UNAM   ESTE de ZIHUATANEJO, GRO 

O: 23APR2014 09:54:56  17.4N  101.6W ML=3.4  UNAM   SUR de ZIHUATANEJO, GRO 

O: 23APR2014 09:26:24  17.4N  100.9W ML=3.3  UNAM   NOROESTE de TECPAN, GRO      

P: 25APR2014 79703     17.0N  102.0W 3.5-5.3 AAAAA  Michoacan, Mexico          

 

O: 23APR2014 06:47:48  13.7N   92.4W ML=4.1  UNAM    SUR de CD HIDALGO, CHIS     

P: 30APR2014 79693     14.0N   93.0W 3.5-5.1 CAAAA  Chiapas, Mexico             

 

O: 23APR2014 10:18:55  13.5N   93.0W ML=4.0  UNAM    SUROESTE de CD HIDALGO, CHIS

P: 22APR2014 79693     14.0N   94.0W 3.5-5.3 AAAAA  Chiapas, Mexico            

 

O: 23APR2014 09:25:15  16.6N   94.4W ML=3.9  UNAM   ESTE de UNION HIDALGO, OAX   

P: 20APR2014 79694     16.0N   93.0W 3.5-5.1 BAAAA  Chiapas, Mexico            

 

O: 23APR2014 02:25:26  15.6N   95.5W ML=4.1  UNAM   SUROESTE de SALINA CRUZ, OAX 

P: 22APR2014 79693     15.0N   95.0W 3.5-5.1 AAAAA  Chiapas, Mexico            

 

O: 23APR2014 06:07:06  31.2N  115.5W ML=3.2  UNAM   NOROESTE de SAN FELIPE, BC   

P: 30APR2014 79761     32.0N  116.3W 2.5-4.5 CAAAA  So. California             

 

AFRICA AND EUROPE

 

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

 

SOUTHWEST PACIFIC

 

O: 24APR2014 02:17:30  10.8S  165.7E mb=5.1  ANSS   Lata Solomon Islands         

O: 24APR2014 02:17:38  10.9S  165.4E ML=5.2  AUS    Santa Cruz Islands

O: 24APR2014 02:17:24  10.8S  165.7E ML=5.2  AUS    Santa Cruz Islands

P: 25APR2014 79860     11.0S  165.0E 4.0-5.4 AAAAA  Vanuatu Islands            

 

O: 23APR2014 07:39:08  11.5S  161.9E mb=4.7  ANSS   Kirakira Solomon Islands     

P: 23APR2014 79854     10.0S  162.0E 4.0-5.4 ABAAA  No. of Santa Cruz Islands  

 

O: 23APR2014 20:04:03  23.7S  179.7W ML=5.5  AUS    South of Fiji Islands.

O: 23APR2014 20:04:06  23.8S  179.8W mb=5.0  ANSS   the Fiji Islands             

P: 30APR2014 79869     22.0S  177.0W 4.0-5.5 CBBAA  Tonga Islands              

 

O: 23APR2014 17:00:42   6.6S  154.9E mb=4.6  ANSS   Panguna Papua New Guinea

O: 23APR2014 05:57:46   6.8S  154.7E mb=4.9  ANSS   Panguna Papua New Guinea

O: 23APR2014 13:03:42   7.5S  154.4E mb=4.6  ANSS   Panguna Papua New Guinea

O: 23APR2014 14:20:52   7.5S  154.6E mb=4.9  ANSS   Panguna Papua New Guinea

O: 23APR2014 08:58:38   7.5S  154.6E mb=5.0  ANSS   Panguna Papua New Guinea

O: 23APR2014 09:03:32   7.5S  154.7E mb=4.7  ANSS   Panguna Papua New Guinea

O: 23APR2014 05:57:51   6.9S  154.4E ML=5.0  AUS    Bougainville Island Region, PNG.

O: 23APR2014 05:40:06   6.9S  154.4E ML=5.4  AUS    Bougainville Island Region, PNG.

O: 23APR2014 05:40:02   6.6S  154.5E mb=5.4  ANSS   Panguna Papua New Guinea     

P: 22APR2014 79676      6.0S  153.0E 4.0-5.8 AABAA  New Britain                

P: 28APR2014 79684      7.0S  155.0E 4.0-5.4 BAAAA  Solomon Islands            

 

OCEAN RIDGES

 

O: 23APR2014 18:21:09  14.8N   45.0W mb=5.1  ANSS   Northern Mid-Atlantic Ridge" 

O: 23APR2014 18:37:28  14.8N   45.1W mb=4.5  EMS NORTHERN MID-ATLANTIC RIDGE

O: 23APR2014 18:21:10  14.9N   45.1W Mw=5.3  EMS NORTHERN MID-ATLANTIC RIDGE

P: 21APR2014 79705     15.0N   46.0W 4.0-5.5 AAAAA  Mid-Atlantic Ridge         

 

NEW ZEALAND AND AUSTRALIA REGION

 

O: 23APR2014 22:42:23  30.7S  178.1W mb=4.7  ANSS   L'Esperance Rock New Zealand 

P: 28APR2014 79876     30.0S  179.0W 4.0-5.4 BAAAA  No. Kermadec Islands       

 

O: 23APR2014 13:01:06  33.3S  138.5E ML=2.6  AUS    Near Georgetown, SA., AUSTRALI

 

JAPAN AND KURIL ISLANDS

 

O: 23APR2014 22:25:07  27.5N  129.4E mb=5.0  ANSS   S of Naze Japan              

O: 23APR2014 22:25     27.6N  129.6E Mj=4.6  NIED   NEAR_AMAMI-OSHIMA_ISLAND , Japan

P: 27APR2014 79724     28.0N  128.0E 4.0-5.4 BAAAA  Ryukyu Islands             

 

JMA reported this earthquake of M 4.6 in the Ryukyu Islands was felt with intensity II in the area(s) of Kagoshima, Ryukyu Islands, Japan.

 

U.S./CANADA*

 

WESTERN U.S./CANADA

 

CALIFORNIA

 

O: 23APR2014 19:20:01  37.3N  122.1W Md=2.0  ANSS   S of Loyola California       

O: 23APR2014 19:20:01  37.3N  122.1W ML=2.0  NCSN    Cupertino, CA

O: 23APR2014 18:30:43  37.5N  121.5W ML=2.4  NCSN    Tracy, CA

O: 23APR2014 18:30:43  37.5N  121.5W Md=2.4  ANSS   East Foothills California    

P: 24APR2014 79734     37.2N  122.1W 2.5-4.5 AAAAA  Central California         

P: 27APR2014 79735     37.4N  121.8W 2.5-4.5 BAAAA  Central California         

 

O: 23APR2014 06:44:55  38.8N  119.8W Md=2.1  ANSS   Gardnerville Ranchos Nevada  

O: 23APR2014 06:44:55  38.8N  119.8W ML=2.1  NCSN    Markleeville, CA

P: 20APR2014 79732     39.1N  119.6W 2.5-4.4 BAAAA  California/Nevada area     

 

O: 23APR2014 09:40:19  38.8N  122.7W Md=2.4  ANSS   The Geysers California       

O: 23APR2014 09:40:19  38.8N  122.7W ML=2.4  NCSN    The Geysers, CA

O: 24APR2014 05:10:07  38.8N  122.8W Md=2.5  ANSS   WNW of Cobb California       

P: 18APR2014 79486     38.7N  122.7W 2.5-4.4 CAAAA  Central California         

P: 26APR2014 79736     39.2N  123.1W 2.5-4.8 AAAAA  Central California         

 

O: 23APR2014 19:20:47  39.6N  121.6W Md=2.3  ANSS   N of Oroville California     

O: 23APR2014 19:20:47  39.6N  121.6W ML=2.3  NCSN    Oroville, CA

P: 27APR2014 79801     40.2N  121.2W 2.5-4.6 BAAAA  Northern California        

 

O: 23APR2014 22:00:45  40.6N  125.4W Ml=3.3  ANSS   W of Ferndale California     

O: 23APR2014 22:00:45  40.6N  125.4W ML=3.3  NCSN    Ferndale, CA

P: 25APR2014 79802     40.6N  124.9W 2.5-4.7 AAAAA  Off Coast of No. Calif     

 

 

ALASKA

 

O: 23APR2014 18:25:34  52.9N  167.6W mb=4.1  ANSS   E of Nikolski Alaska         

P: 23APR2014 79822     53.5N  167.3W 3.5-4.9 AAAAA  Fox Islands, Aleutians     

 

O: 23APR2014 07:57:40  62.8N  150.6W ml=4.0  ANSS   NNW of Talkeetna Alaska      

P: 29APR2014 79839     62.6N  151.4W 3.2-4.9 CAAAA  Central Alaska             

 

O: 24APR2014 02:47:32  53.7N  163.8W ML=4.5  EMS UNIMAK ISLAND REGION, CNASKA    

P: 23APR2014 79822     53.7N  165.3W 3.5-4.9 AAAAA  Fox Islands, Aleutians     

 

PACIFIC NORTHWESTERN U.S./WESTERN CANADA

 

O: 24APR2014 04:18:58  47.3N  123.8W Md=2.3  ANSS   Census Designated Place Washin

P: 28APR2014 79814     47.5N  121.8W 2.0-3.9 BABAA  Washington state, U.S.     

 

O: 23APR2014 21:15:02  47.6N  122.9W Ml=2.4  ANSS   SSW of Seabeck Washington    

P: 24APR2014 79814     48.9N  122.1W 2.0-4.1 ABAAA  Washington state, U.S.     

 

NEIC reported this earthquake of M 2.4 in the Puget Sound area of Washington was felt with intensity II-III in the area(s) of Auburn and Stanwood, Washington.

 

ROCKY MOUNTAINS REGION

 

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

 

EASTERN U.S./CANADA

 

O: 23APR2014 15:35:33  36.7N   98.6W ml=3.1  ANSS   SE of Alva Oklahoma          

O: 23APR2014 15:35:33  36.7N   98.6W ML=3.1  CESN   Dacoma, OK 

P: 20APR2014 79774     36.0N   97.0W 2.0-3.9 BAAAA  Southern Plains             

 

HAWAII

 

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