M6.2 earthquake, series of aftershocks hit Andreanof Islands, Alaska

ByTeo Blašković

A strong and shallow earthquake registered by the USGS as M6.2 hit near Adak, Andreanof Islands, Aleutian Islands, Alaska at 14:53 UTC on March 21, 2025. The agency is reporting a depth of 26 km (16 miles). EMSC is reporting M6.2 at a depth of 30 km (18 miles). The quake took place just 3 minutes after M6.2 south of Panama.

m6.2 earthquake andreanof island alaska march 21 2025 location map

Image credit: TW/SAM, Google

The epicenter was located 84 km (52 miles) SSE of Adak (population 332) and 1 545 km (960 miles) SSE of Anadyr, Russia.

The USGS issued a Green alert for shaking-related fatalities and economic losses. There is a low likelihood of casualties and damage.

Overall, the population in this region resides in structures that are resistant to earthquake shaking, though vulnerable structures exist. The predominant vulnerable building types are unreinforced brick masonry and reinforced masonry construction.

The quake was followed by M5.7 aftershock at 14:58 UTC and M5.0 at 15:03 UTC.

This is the second M6+ earthquake of the day, following M6.2 south of Panama at 14:50 UTC.

m6.2 earthquake andreanof island alaska march 21 2025 location map bg
Image credit: TW/SAM, Google

Regional seismicity

m6.2 earthquake andreanof island alaska march 21 2025 emsc regional seismicity
Image credit: EMSC

References:

1 M6.2 earthquake Alaska – USGS – March 21, 2025

2 M6.2 earthquake Alaska – EMSC – March 21, 2025

3 Shallow M6.2 earthquake hits south of Panama – The Watchers – March 21, 2025


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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