Strong and shallow M6.3 earthquake hits Andreanof Islands, Alaska
Image credit: TW/SAM, Google
A strong earthquake registered by the USGS as M6.3 hit Andreanof Islands, Alaska, U.S. at 14:55 UTC on December 21, 2023. The agency is reporting a depth of 33 km (20.5 miles). EMSC is reporting M6.1 at a depth of 10 km (6.2 miles).
The epicenter was located 106.5 km (66.2 miles) SE of Adak, U.S., and 1 540 km (960 miles) SSE of Anadyr, Russia.
1 000 people are estimated to have felt light shaking.
The USGS issued a Green alert for shaking-related fatalities and economic losses. There is a low likelihood of casualties and damage.
Based on a rapid preliminary assessment of the earthquake’s magnitude and depth (M6.0; Depth: 1.6 km (1 mile)), a tsunami is not expected, NWS NTWC said at 14:59 UTC.
Regional seismicity
Teo Blašković founded The Watchers in 2011 and edited it until 2026, covering seismic and volcanic activity, extreme weather, space weather and near-Earth objects. Articles on this page are his archive.
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