Monthly Seismicity Report For December 1, 2019 to December 31, 2019

During the month of December 2019, the Alaska Earthquake Center reported 3,265 earthquakes within the state. The largest earthquake was magnitude 6.0 that occurred on December 1 at 20:01:54 AKST (December 2, 05:01:54 UTC), 52 miles S of Tanaga Volcano. 24 events were felt this Month. 7 of these felt events were from the November 2018 M7.1 Anchorage Earthquake, however, the event with the most felt reports goes to the magnitude 5.1 earthquake just off shore of Lituya Bay, 71 miles west of Gustavus, with over 250 responses! The Offshore Kodiak and Kaktovik aftershocks continue to be quite active this month, along with the Purcell Mountains and Eastern Brooks Range swarm.

Notable Events in Descending Order of Magnitude

Magnitude 6.0, 52 miles S of Tanaga Volcano, December 1 20:01:55 AKST
Magnitude 5.1, 55 miles NW of Elfin Cove, December 18 12:52:04 AKST
Magnitude 5.0, 75 miles SE of Old Harbor, December 21 13:52:37 AKST
Magnitude 4.7, 158 miles SE of Kodiak, December 1 20:46:45 AKST
Magnitude 4.6, 114 miles SE of Old Harbor, December 21 13:52:34 AKST
Magnitude 4.5, 84 miles SE of Old Harbor, December 21 13:52:11 AKST
Magnitude 4.5, 28 miles NE of Augustine Volcano, December 1 03:27:53 AKST
Magnitude 4.4, 41 miles S of Unalaska, December 2 06:23:53 AKST
Magnitude 4.4, 49 miles SW of Kaktovik, December 16 03:17:44 AKST
Magnitude 4.2, 114 miles S of Akhiok, December 1 19:31:50 AKST

This report was compiled by M. Braun.

The data in this report are preliminary and subject to revision. The earthquake parameters have been determined by the AEC, with supplemental data provided by the USGS National Earthquake Information Center. The data are released on the condition that none of the cooperating agencies may be held liable for any damaged resulting from its authroized or unauthorized use.

For more information on earthquakes and seismology, contact the AEC at (907)-474-7320.