- Earthquake summary

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MODERATE QUAKES SHAKE VANCOUVER ISLAND, CANADA

EARTHQUAKE SUMMARY FOR DECEMBER 9, 2018

A series of moderate to moderately strong earthquakes occurred in the region west of Vancouver Island, British Columbis today. The strongest of these was an M 7.6 which was lightly felt in the Vancouver Island region.It was accompanied by several of M4.5-5.5. No tsunamis or damages were reported nor were than anticipated. These earthquakes are located at 103-104 degrees from the M 7.5 in Minahasa of September, 2018 and the fourth node (90 degrees) from the strong quakes in the Loyalty Islands of December 5 and following and were probably promoted by energy from that source. Seismicity in the Loyalty Islands today included an M 4.9 and 5.0 earthquake but the immediate moderate aftershocks are largely over at this point. The Vancouver event of M 5.4 is the strongest in the region since the major shocks of October 22, 2018 which included an M 6.6, 6.8 and 6.5. Forecast 121860 had expected elevated seismicity in the Vancouver area around December 8.

O: 9DEC2018 17:48:39 49.0N 128.9W mb=4.8 EMSC VANCOUVER ISLAND, CANADA REGIO

O: 09DEC2018 20:58:53 48.8N 129.3W ML=3.9 NRCA 249 km W of Tofino

O: 09DEC2018 18:14:19 48.7N 129.2W ML=4.1 NRCA 243 km W of Tofino

O: 09DEC2018 17:48:37 48.7N 129.2W ML=4.4 NRCA 243 km W of Tofino

O: 09DEC2018 16:20:10 48.7N 129.2W ML=4.7 NRCA 245 km W of Tofino

O: 9DEC2018 18:14:25 49.1N 128.3W mb=4.2 EMSC VANCOUVER ISLAND, CANADA REGIO

O: 9DEC2018 16:20:14 49.1N 128.8W Mw=5.4 EMSC VANCOUVER ISLAND, CANADA REGIO

P: 8DEC2018 121860 48.3N 128.5W 2.8-4.9 AAAAA Vancouver Island area

O: 9DEC2018 20:37:51 21.9S 169.2E mb=5.1 EMSC SOUTHEAST OF LOYALTY ISLANDS

O: 9DEC2018 07:03:06 21.9S 169.7E mb=4.6 EMSC SOUTHEAST OF LOYALTY ISLANDS

P: 9DEC2018 121918 21.0S 169.0E 4.0-5.6 AAAAA Loyalty Islands

A moderate aftershock of M 5.0 also occurred in the Anchorage, Alaska aftershock zone today where ut was felt with moderate intensity in the area of Anchorage. This is the strongest aftershock in the series in the past 9 days following an M 5.2 on December 1, 2018. The mainshock of M 7.0 occurred on November 30, 2018.Over all, however seismicity in the aftershock zone did not significantly increase today with just six events of M>=3 recorded. Forecast 121886 had expected today's activity around December 9.

O: 9DEC2018 12:20:53 61.3N 149.9W ML=3.0 EMSC SOUTHERN ALASKA

O: 10DEC2018 06:41:28 61.4N 149.9W Ml=3.0 EMSC SOUTHERN ALASKA

O: 9DEC2018 19:00:29 61.4N 149.9W mb=5.0 EMSC SOUTHERN ALASKA

O: 9DEC2018 19:26:15 61.4N 150.1W ML=3.8 EMSC SOUTHERN ALASKA

O: 9DEC2018 15:40:00 61.4N 150.1W Ml=3.4 EMSC SOUTHERN ALASKA

O: 9DEC2018 07:03:36 61.5N 150.0W ML=3.9 EMSC SOUTHERN ALASKA

P: 9DEC2018 121886 61.3N 150.9W 3.2-5.3 AAAAA Central Alaska

A light earthquake of M 2.1 also occurred in the region of Illinois, U.S today. The only other earthquake located in Illinois during 2018 was an M 2.3 on September 2-. Today's event was not reported felt. Other earthquakes occurred in Eastern Tennessee with M 2.3 about three hours later. Forecast 121794 had expected the event in Illinois was likely around December 6.

O: 9DEC2018 11:00:13 38.1N 89.3W MD=2.3 EMSC ILLINOIS

P: 6DEC2018 121794 38.0N 91.0W 2.0-4.1 BABAA New Madrid area

O: 9DEC2018 14:22:29 35.9N 83.8W MD=2.3 EMSC EASTERN TENNESSEE

P: 8DEC2018 121788 35.0N 82.0W 2.0-3.9 AABAA Kentucky/Tennessee/NC

An unusually large earthquake of M 4.7 also occurred today in the region of Puerto Rico. It was lightly felt in the epicentral area. This is the strongest earthquake in Puerto Rico since an M 4.9 on November 14, 2018 and prior to that an M 4.8 on August 18, 2017. The last event of significantly larger magnitude in Puerto Rico was an M 66.4 on January 13, 2014. Puerto Rico often sees an upsurge is seismic activity in mid-December, but the cause of this is not known. Forecast 121757 had expected today's activity was likely around December 6.

O: 9DEC2018 23:00:37 18.8N 66.4W mb=4.7 EMSC PUERTO RICO REGION

O: 9DEC2018 16:12:15 18.9N 65.1W Md=3.0 EMSC VIRGIN ISLANDS REGION

P: 6DEC2018 121757 20.0N 65.0W 3.0-4.6 BBAAA Bahamas/No. Caribbean

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: 9DEC2018 15:15:4. 24.1N 121.5E ML=5.1 TAI Hualien, Taiwan

P: 7DEC2018 121769 23.0N 121.0E 4.0-5.6 ABAAA Taiwan

CWB reported the M 5.2 was felt with intensity V in Hualien; IV in Nantou and Taichung; III in Yilan; II in Taoyuan, Hsinchu, Changhua, Yunlin, Taitung and Taipei and I in Kaohsiung Counties, Taiwan.

NEIC reported this earthquake of M 5.1 in Taiwan was felt with intensity II-III in the area(s) of Hualien, Taipei, Taoyuan, Taiwan.

O: 9DEC2018 14:58:18 36.0N 70.2E mb=4.2 EMSC HINDU KUSH REGION, AFGHANISTAN

O: 9DEC2018 15:39:35 36.6N 71.0E mb=4.3 EMSC HINDU KUSH REGION, AFGHANISTAN

P: 8DEC2018 121786 36.0N 70.0E 3.8-5.2 AAAAA Hindu Kush/Pakistan

O: 10DEC2018 04:06:05 40.4N 63.2E mb=4.5 EMSC WESTERN UZBEKISTAN

P: 8DEC2018 121786 36.0N 70.0E 3.8-5.2 ACCAA Hindu Kush/Pakistan

INDONESIA AND PHILIPPINES

O: 10DEC2018 01:26:13 0.8N 125.3E mb=4.8 EMSC MOLUCCA SEA

P: 8DEC2018 121705 2.0N 125.0E 4.0-5.4 ABAAA Mindanao, Philippines

O: 10DEC2018 03:00:30 3.7N 122.3E mb=4.4 EMSC CELEBES SEA

P: 9DEC2018 121697 1.0N 122.0E 4.0-5.6 ACAAA Celebes Sea

O: 9DEC2018 12:23:43 9.0S 108.4E mb=4.5 EMSC SOUTH OF JAVA, INDONESIA

P: 7DEC2018 121910 10.0S 109.0E 4.0-5.6 AAAAA So. of Java

O: 9DEC2018 10:33:23 9.6S 112.9E mb=4.6 EMSC SOUTH OF JAVA, INDONESIA

P: 8DEC2018 121910 10.0S 116.0E 4.0-5.4 AACAA Sumbawa Island area

P: 9DEC2018 121721 6.0S 113.0E 4.0-5.6 ACAAA So. of Bali

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

CENTRAL AND SOUTH AMERICA

O: 10DEC2018 05:03:38 10.1N 103.9W mb=4.6 EMSC NORTHERN EAST PACIFIC RISE

P: 4DEC2018 121745 10.0N 104.0W 3.5-5.5 CAAAA Michoacan, Mexico

P: 11DEC2018 121699 9.0N 103.0W 4.0-5.7 ABAAA Central Pacific Ocean

O: 9DEC2018 16:27:00 4.1S 80.3W ML=4.0 EMSC PERU-ECUADOR BORDER REGION

O: 9DEC2018 10:00:00 4.7S 78.6W ML=4.4 EMSC PERU-ECUADOR BORDER REGION

P: 6DEC2018 121711 4.0S 80.0W 4.0-5.6 BABAA Ecuador

O: 9DEC2018 19:42:32 14.5N 92.4W ML=4.1 EMSC OFFSHORE CHIAPAS, MEXICO

P: 9DEC2018 121735 14.0N 93.0W 3.5-5.3 AAAAA Chiapas, Mexico

O: 9DEC2018 22:25:18 14.7N 60.1W ML=3.8 EMSC MARTINIQUE REGION, WINDWARD IS

P: 6DEC2018 121742 15.0N 60.0W 3.0-5.6 BAAAA Leeward Islands

O: 9DEC2018 21:36:10 15.5N 95.1W ML=4.2 EMSC OFFSHORE OAXACA, MEXICO

P: 8DEC2018 121735 16.0N 95.0W 3.5-5.4 AAAAA Chiapas, Mexico

O: 9DEC2018 08:33:24 15.5N 96.0W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO

O: 10DEC2018 05:17:09 15.5N 97.5W ML=4.0 EMSC OFFSHORE OAXACA, MEXICO

P: 8DEC2018 121752 15.0N 96.0W 3.5-5.3 AAAAA Oaxaca, Mexico

O: 9DEC2018 18:48:23 18.0N 68.2W Md=3.1 EMSC DOMINICAN REPUBLIC REGION

P: 11DEC2018 121758 20.0N 68.0W 3.0-4.6 ABAAA Bahamas/No. Caribbean

O: 9DEC2018 07:18:19 18.2N 103.4W ML=3.3 EMSC OFFSHORE MICHOACAN, MEXICO

O: 9DEC2018 15:46:32 18.2N 103.4W ML=4.0 EMSC OFFSHORE MICHOACAN, MEXICO

P: 7DEC2018 121747 18.0N 104.0W 3.5-5.6 AAAAA Michoacan, Mexico

O: 9DEC2018 23:00:37 18.8N 66.4W mb=4.7 EMSC PUERTO RICO REGION

O: 9DEC2018 16:12:15 18.9N 65.1W Md=3.0 EMSC VIRGIN ISLANDS REGION

P: 6DEC2018 121757 20.0N 65.0W 3.0-4.6 BBAAA Bahamas/No. Caribbean

O: 9DEC2018 23:06:55 21.9S 68.3W mb=4.9 EMSC ANTOFAGASTA, CHILE

O: 9DEC2018 15:54:59 24.8S 70.6W mb=4.0 EMSC OFFSHORE ANTOFAGASTA, CHILE

P: 8DEC2018 121915 24.0S 68.0W 4.0-5.9 AABAA Argentina

O: 9DEC2018 20:42:42 23.9S 66.7W mb=4.5 EMSC JUJUY, ARGENTINA

P: 8DEC2018 121915 24.0S 68.0W 4.0-5.9 AAAAA Argentina

O: 9DEC2018 15:54:59 24.8S 70.6W mb=4.0 EMSC OFFSHORE ANTOFAGASTA, CHILE

P: 8DEC2018 121915 24.0S 68.0W 4.0-5.9 AABAA Argentina

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

AFRICA AND EUROPE

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

SOUTHWEST PACIFIC

O: 9DEC2018 21:52:24 20.8S 170.0E mb=5.0 EMSC VANUATU

P: 9DEC2018 121918 21.0S 169.0E 4.0-5.6 AAAAA Loyalty Islands

O: 9DEC2018 12:36:44 21.1S 178.2W mb=4.6 EMSC FIJI REGION

P: 5DEC2018 121926 22.0S 179.0W 4.0-5.5 BAAAA Tonga Islands

O: 10DEC2018 04:22:55 18.9S 177.7W mb=4.3 EMSC FIJI REGION

P: 10DEC2018 121911 18.0S 178.0W 4.0-5.8 AAAAA Tonga Islands

O: 9DEC2018 20:37:51 21.9S 169.2E mb=5.1 EMSC SOUTHEAST OF LOYALTY ISLANDS

O: 9DEC2018 07:03:06 21.9S 169.7E mb=4.6 EMSC SOUTHEAST OF LOYALTY ISLANDS

P: 9DEC2018 121918 21.0S 169.0E 4.0-5.6 AAAAA Loyalty Islands

No significant (M>=5) or unusual earthquakes were reported in the Southwest Pacific region today.

OCEAN RIDGES

O: 10DEC2018 05:03:38 10.1N 103.9W mb=4.6 EMSC NORTHERN EAST PACIFIC RISE

P: 4DEC2018 121745 10.0N 104.0W 3.5-5.5 CAAAA Michoacan, Mexico

P: 11DEC2018 121699 9.0N 103.0W 4.0-5.7 ABAAA Central Pacific Ocean

O: 10DEC2018 03:07:13 41.0S 43.6E mb=4.9 EMSC SOUTHWEST INDIAN RIDGE

P: 11DEC2018 121940 41.0S 43.0E 4.0-5.4 AAAAA So. Indian Ocean

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

ZEALANDIA AND AUSTRALIA REGION

No earthquakes of M>=4 were recorded in the regions of Zealandia or Australia

today. GeoNet did not report any felt events in the area.

JAPAN AND KURIL ISLANDS

O: 9DEC2018 15:21:41 33.2N 137.9E mb=4.9 EMSC NEAR S. COAST OF HONSHU, JAPAN

P: 5DEC2018 121789 34.0N 132.0E 3.5-5.1 BACAA Kyushu, Japan area

NEIC reported this earthquake of M 4.9 in Eastern Honshu, Japan was felt with intensity II-III in the area(s) of Kanagawa, Tokyo and Chiba Prefectures, Japan.

O: 9DEC2018 14:06:27 46.7N 153.0E mb=4.8 EMSC KURIL ISLANDS

P: 7DEC2018 121843 47.0N 155.0E 3.5-5.8 ABAAA NE Pacific

O: 9DEC2018 10:53:18 48.4N 155.0E mb=4.5 EMSC KURIL ISLANDS

P: 7DEC2018 121843 47.0N 155.0E 3.5-5.8 ABAAA NE Pacific

U.S./CANADA*

WESTERN U.S./CANADA

CALIFORNIA

O: 10DEC2018 00:21:45 33.5N 116.8W Ml=2.1 EMSC SOUTHERN CALIFORNIA

P: 5DEC2018 121810 33.7N 117.5W 2.5-4.5 AAAAA So. California

O: 9DEC2018 22:52:22 36.5N 121.1W Md=2.0 EMSC CENTRAL CALIFORNIA

P: 7DEC2018 121778 36.4N 121.0W 2.5-4.4 AAAAA Central California

NEIC reported this earthquake of M 2.6 in Northern California was felt with intensity II-III in the area(s) of Port Costa, Vallejo, Benicia, Pinole, Martinez, and El Centro among other communities in California.

O: 10DEC2018 04:29:23 38.4N 122.6W Md=2.4 EMSC NORTHERN CALIFORNIA

O: 9DEC2018 13:15:04 38.8N 122.7W Md=2.8 EMSC NORTHERN CALIFORNIA

O: 10DEC2018 06:22:13 38.8N 122.8W Md=2.3 EMSC NORTHERN CALIFORNIA

O: 9DEC2018 12:10:17 38.8N 122.8W Md=2.4 EMSC NORTHERN CALIFORNIA

P: 11DEC2018 121781 38.7N 122.7W 2.5-4.4 AAAAA Central California

NEIC reported this earthquake of M 2.5 in Northern California was felt with intensity II-III in the area(s) of Middletown and Calistoga, California.

ALASKA

O: 9DEC2018 12:44:49 56.4N 148.5W Ml=3.2 EMSC GULF OF ALASKA

P: 7DEC2018 121892 55.0N 149.0W 3.0-4.6 AAAAA Gulf of Alaska

O: 9DEC2018 12:20:53 61.3N 149.9W ML=3.0 EMSC SOUTHERN ALASKA

O: 10DEC2018 06:41:28 61.4N 149.9W Ml=3.0 EMSC SOUTHERN ALASKA

O: 9DEC2018 19:00:29 61.4N 149.9W mb=5.0 EMSC SOUTHERN ALASKA

O: 9DEC2018 19:26:15 61.4N 150.1W ML=3.8 EMSC SOUTHERN ALASKA

O: 9DEC2018 15:40:00 61.4N 150.1W Ml=3.4 EMSC SOUTHERN ALASKA

O: 9DEC2018 07:03:36 61.5N 150.0W ML=3.9 EMSC SOUTHERN ALASKA

P: 9DEC2018 121886 61.3N 150.9W 3.2-5.3 AAAAA Central Alaska

PACIFIC NORTHWESTERN U.S./WESTERN CANADA