MONTH SEISMICITY REPORT FOR MARCH 2023
During the month of March 2023, the Alaska Earthquake Center reported 4558 earthquakes within the state. The largest earthquake was magnitude 5.4 that occurred on March 19 at 07:06:27 AKDT (March 19, 15:06:27 UTC), 12 miles S of Anchor Point. This earthquake was widely felt in Kenai Peninsula communities and as far as the MatSu valley. 1263 felt reports were submitted.
Other 13 earthquakes of magnitude greater than 4.0 were located along the subduction zone except a M4.7 on March 1st 28 miles West of lake Minchumina in the interior of Alaska.
Seismic activity at volcanoes was elevated in March. We recorded 902 volcano-tectonic earthquakes along the Aleutian Arc at Trident (Katmai group) , Aniakchak, , Makushin, Takawangha and Tanaga volcanoes. These volcanoes are currently at "YELLOW Alert Level ADVISORY" by the Alaska Volcano Observatory. Please see https://avo.alaska.edu for more details.
Other than that we recorded 37 suspected quarry blasts, 41 glacial events, and 7 events of unknown origin.
We continue to monitor seismic activity within Anchorage, offshore Kodiak, Simeonof-Chignik, Kaktovik aftershock zones as well as crustal seismic activity in the Brooks Range, Seward Peninsula and Bering Strait.
Ten earthquakes were reported as felt in March.
NOTABLE EVENTS IN DESCENDING ORDER OF MAGNITUDE
Magnitude 5.4, 12 miles S of Anchor Point, March 19 07:06:27 AKDT
Magnitude 4.9, 50 miles E of Middleton Island, March 17 07:04:25 AKDT
Magnitude 4.9, 38 miles N of Uliaga Island, March 20 15:25:30 AKDT
Magnitude 4.7, 28 miles W of Lake Minchumina, March 1 21:56:29 AKST
Magnitude 4.6, 40 miles SE of Mt. Gareloi, March 10 15:39:00 AKST
Magnitude 4.5, 33 miles SE of Port Graham, February 28 20:57:59 AKST
Magnitude 4.5, 64 miles SE of Sand Point, March 7 04:12:10 AKST
Magnitude 4.5, 55 miles W of Burwash Landing, March 7 22:32:54 AKST
Magnitude 4.5, 138 miles S of Mt. Gareloi, March 26 21:25:22 AKDT
Magnitude 4.4, 56 miles SE of Westdahl Peak, March 5 17:59:35 AKST
This report was compiled by N. Kozyreva
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 authorized or unauthorized use.
For more information on earthquakes and seismology, contact the AEC at 907-474-7320.