Magnitude 3.5 - 72 miles S of Sand Point
April 9, 2023 19:24:53 AKDT (April 10, 2023 03:24:53 UTC)
54.3742°N 159.8208°W Depth 18.9 miles (30 km)
This event has been reviewed by a seismologist
- 104 miles (168 km) SE of Mt. Dana
- 109 miles (176 km) S of Perryville
- 110 miles (178 km) SE of King Cove
- 110 miles (178 km) SE of Pavlof Sister
- 110 miles (178 km) SE of Pavlof Volcano
- 112 miles (181 km) SE of Emmons Lake
- 113 miles (183 km) SE of Mt. Dutton
- 113 miles (183 km) S of Mt. Kupreanof
- 125 miles (202 km) SE of Nelson Lagoon
- 127 miles (205 km) S of Mt. Veniaminof
- 128 miles (207 km) SE of Cold Bay
- 273 miles (442 km) E of Dutch
- Magnitude type: Ml2
- Event type: earthquake
Tectonic Setting of the Alaska Peninsula
Seismicity in the Alaska Peninsula region is produced by different tectonic features: (1) The Aleutian megathrust is the source of the strongest earthquakes in the region. The most recent examples include the 2020 M7.8 Simeonof Earthquake under the Shumagin Islands and the 2021 M8.2 Chignik Earthquake southwest of Kodiak Island. While these recent earthquakes did not produce damaging tsunamis, previous tsunamis were documented in historical records of Russian communities and in recently discovered paleo-tsunami deposits. (2) Intermediate depth seismicity (below 20 miles/32 km) occurs in the Wadati-Benioff Zone, where the subducting Pacific Plate descends towards the mantle beneath the North American Plate. This zone extends along the Aleutian Arc, Alaska Peninsula, and Cook Inlet. In the Alaska Peninsula region, the seismicity abates at approximately 150 miles (241 km) depth, reflecting the down-dip extension of the Pacific Plate. The Aleutian-Alaska Wadati-Benioff Zone produces thousands of earthquakes each year, most of which are too deep and too small to be felt. The most notable examples of such earthquakes are the 1999 M7.0 and the 2001 M6.9 Kodiak Island events. Both earthquakes caused damage and disruption to the City of Kodiak and other communities on the island. (3) Crustal seismicity in this region can be attributed to the Kodiak Shelf Fault Zone and to the volcanic arc. In 1912, a series of M7+ earthquakes was associated with the Novarupta eruption, which was the largest volcanic eruption of the 20th century worldwide.