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M2.4 Mount Griggs | Alaska Earthquake Center

M2.4 Mount Griggs | Alaska Earthquake Center

 


September 17, 2024 16:21:32 AKDT (September 18, 2024 00:21:32 UTC)58.6342°N 155.2594°W Depth 78.3 miles (126 km)

This event has not been reviewed by a seismologist.

26 miles (42 km) north of Novarupta27 miles (43 km) northwest of Mount Katmai28 miles (45 km) north of Trident Volcano29 miles (47 km) northwest of Mount Snowy30 miles (48 km) north of Mount Magic32 miles (51 km) north of Mount Martin33 miles (53 km) northwest of Mount Denison34 miles (55 km) northwest of Mount Stellar35 miles (56 km) west of Kokak Volcano36 miles (58 km) west of Devil's Bureau43 miles (69 km) west of Kaguyaak Crater119 miles (192 km) northwest of Kodiak257 miles (416 km) southwest of AnchorageMagnitude: ML2Event Type: EarthquakeTectonic Setting of the Alaska PeninsulaEarthquakes in the Alaska Peninsula are produced by various tectonic features: (1) The Aleutian Islands' massive thrust is the source of the strongest earthquakes In the region. More recent examples include the 2020 magnitude 7.8 Semyonov earthquake under the Shumagin Islands and the 2021 magnitude 8.2 Chizhnik earthquake southwest of Kodiak Island. While these recent earthquakes did not produce destructive waves, previous tsunamis have been documented in historical records of Russian communities and in recently discovered ancient tsunami deposits. (2) Earthquakes occur at intermediate depth (less than 20 miles/32 km) in the Wadati-Beniov zone, where the subducting quiescent plate descends into the mantle beneath the North American plate. This zone extends along the Aleutian Arc, the Alaska Peninsula, and Cook Inlet. In the Alaska Peninsula area, earthquakes quieten at a depth of about 150 miles (241 km), reflecting the downward extension of the quiescent plate. The Aleutian-Alaska Wadati-Benioff region produces thousands of earthquakes each year, most of which are too deep and small to be felt. Notable examples of these earthquakes include the 1999 magnitude 7.0 Kodiak Island earthquake and the 2001 magnitude 6.9 earthquake. Both earthquakes caused damage and disruption to the city of Kodiak and other communities on the island. (3) Crustal earthquakes in this region can be attributed to the Kodiak Escarpment Fault Zone and the volcanic arc. In 1912, a series of magnitude 7.0 earthquakes were associated with the eruption of Novarupta, the largest volcanic eruption worldwide in the 20th century.

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2/ https://earthquake.alaska.edu/event/024c1axhxb

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