MONTH SEISMICITY REPORT FOR AUGUST 2023
During the month of August 2023, the Alaska Earthquake Center reported 3962 events within the state with magnitudes ranging between 0.3 and 5.6 and depths between 0 and 250 km. The largest earthquake was magnitude 5.6 that occurred on August 3 at 11:33:50 AKDT (August 3, 19:33:50 UTC), 53 miles SW of Sand Point.There were 9 other earthquakes with magnitudes 4.5.-5.0. They occurred along the subduction zone except the M4.8 crustal earthquake 92 miles NW of Haines Junction and M4.5 in Chukchi Sea. In Chukchi Sea, there were located also 12 smaller events with magnitudes ranging between 2.5 and 3.5.
We also reported seismic sources that were classified as other than regional tectonic earthquakes. Of these, 40 were suspected quarry blasts all of which were located in the vicinity of either Fort Knox or Usibelli mines in Interior Alaska, 127 icequakes primarily located in the Prince William Sound, Icy Bay, Yakutat Bay and Pothole glacier at Mt Spurr areas. We located 147 quakes associated with volcanic activity. The seismic activity was observed mostly at the Katmai volcanic group.
12 earthquakes were reported as being felt in August.
NOTABLE EVENTS IN DESCENDING ORDER OF MAGNITUDE
Magnitude 5.6, 53 miles SW of Sand Point, August 3 11:33:51 AKDT
Magnitude 5.2, 105 miles SE of Nikolski, August 19 17:48:59 AKDT
Magnitude 5.1, 51 miles SW of Sand Point, August 30 10:59:25 AKDT
Magnitude 5.0, 59 miles S of Westdahl Peak, August 14 14:13:12 AKDT
Magnitude 4.8, 36 miles NW of Burwash Landing, August 6 12:22:04 AKDT
Magnitude 4.7, 22 miles N of Augustine Volcano, August 5 16:17:51 AKDT
Magnitude 4.7, 62 miles S of Tanaga Volcano, August 15 08:20:54 AKDT
Magnitude 4.7, 45 miles S of Mt. Gareloi, August 30 23:13:23 AKDT
Magnitude 4.6, 54 miles SE of Herbert Island, August 16 01:50:23 AKDT
Magnitude 4.6, 51 miles SW of Sand Point, August 28 14:01:30 AKDT
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.