Mount Stellar M1.6 | Alaska Earthquake Center

Jun 2, 2024 12:16:10 AKDT (Jun 2, 2024 8:16:10 PM UTC)
58.1662°N 153.9868°W Depth 65 km (40.1 miles)

This event has not been rated by a seismologist

Tectonic setting of the Alaska Peninsula

Seismicity in the Alaska Peninsula region is caused by several 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 beneath the Shumagin Islands and the 2021 M8.2 Chignik earthquake southwest of Kodiak Island. Although these recent earthquakes did not produce damaging tsunamis, previous tsunamis were documented in historical archives of Russian communities and in recently discovered paleo-tsunami deposits. (2) Intermediate depth seismicity (less than 32 km/20 miles) occurs in the Wadati-Benioff zone, where the subducting Pacific plate is descending into the mantle beneath the North American plate. This zone extends along the Aleutian Arch, the Alaska Peninsula and Cook Inlet. In the Alaska Peninsula region, seismicity decreases at a depth of approximately 241 km, reflecting the downward extension of the Pacific plate. The Aleutian Islands-Alaska Wadati-Benioff Zone produces thousands of earthquakes every year, most of which are too deep and small to be felt. The most notable examples of such earthquakes are the 1999 M7.0 events and the 2001 M6.9 events on Kodiak Island. Both earthquakes caused damage and disruption in 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 were associated with the eruption of Novarupta, the world’s largest volcanic eruption of the 20th century.

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