Weekly Seismicity Report For February 18, 2019 to February 24, 2019

During the week of February 18, 2019, the Alaska Earthquake Center reported 814 earthquakes within the state. The largest earthquake was magnitude 4.4 that occurred on February 18 at 08:02:46 AKST (February 18, 17:02:46 UTC), 15 miles N of Elmendorf AFB. 4 events were felt this week, 3 of which were aftershocks of the M7.1 Anchorage earthquake on November 30, 2018. The largest aftershock this week was a magnitude 4.4 on February 18th. The offshore Kodiak aftershock sequence as well as the northern Kaktovik aftershock sequence are still fairly active. And of note, there are two earthquake swarms occurring on the Seward Peninsula: one is located northwest of Brevig Mission, and the other is located in the Purcell Mountains (42 miles south of Kobuk).

Notable Events in Descending Order of Magnitude

Magnitude 4.4, 15 miles N of Elmendorf AFB, February 18 07:02:46 AKST
Magnitude 4.4, 45 miles SE of Amchitka, February 17 17:41:47 AKST
Magnitude 4.2, 53 miles SE of Atka, February 21 07:13:45 AKST
Magnitude 4.0, 173 miles SE of Kodiak, February 22 18:45:11 AKST
Magnitude 3.9, 92 miles SE of Westdahl Peak, February 23 19:07:53 AKST
Magnitude 3.9, 34 miles SE of Nikolski, February 20 22:52:21 AKST
Magnitude 3.8, 7 miles SW of Augustine Volcano, February 19 20:16:41 AKST
Magnitude 3.7, 192 miles SE of Old Harbor, February 21 14:28:20 AKST
Magnitude 3.7, 19 miles NW of Brevig Mission, February 21 23:52:56 AKST
Magnitude 3.7, 30 miles S of Adak, February 19 15:14:39 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.