Monthly Seismicity Report For October 1, 2018 to October 31, 2018

During the month of October, 2018, the Alaska Earthquake Center reported 4,213 earthquakes within the state. The largest earthquake was magnitude 5.3 that occurred on October 27 at 08:57:27 AKST (October 27, 16:57:27 UTC), 13 miles ENE of Tanana. 14 events were felt this month. Earthquakes of note include the unusual Hooper Bay earthquake that was a magnitude 4.9 just off shore, and the ongoing aftershock sequence caused by the magnitude 6.4 Kaktovik earthquake last August. There is also a vigorous cluster of earthquakes continuing in the Eastern Brooks Range, as well as continuing aftershocks from the magnitude 7.9 earthquake that occurred offshore from Kodiak last January. Another interesting location is the small cluster on the Seward Peninsula near Crooked Creek that lasted for a couple weeks. October is also a very active month for glacial earthquakes seen in the southeast. 

Notable Events in Descending Order of Magnitude

Magnitude 5.3, 15 miles E of Tanana
Magnitude 5.3, 61 miles NE of Ambler
Magnitude 5.0, 21 miles SE of Perryville
Magnitude 4.9, 43 miles SW of Hooper Bay
Magnitude 4.9, 151 miles SE of Kodiak
Magnitude 4.8, 50 miles S of Nikolski
Magnitude 4.8, 47 miles SE of Westdahl Peak
Magnitude 4.7, 28 miles W of Westdahl Peak
Magnitude 4.6, 6 miles SE of Mt. Vsevidof

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.