M6.1 earthquake near the coast of Amatignak Island, Andreanof Islands, Alaska


A strong earthquake registered by the USGS as M6.1 hit near the coast of Amatignak Island, Andreanof Islands, Alaska at 11:52 UTC on September 24, 2021. The agency is reporting a depth of 39 km (24 miles). EMSC is reporting the same magnitude and depth.

The epicenter was located 182 km (113 miles) WSW of Adak (population 332), Alaska, U.S., and 1 429 km (888 miles) ESE of Klyuchi, Russia.

There are no people living within 100 km (62 miles).

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.

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.

A tsunami is not expected, NWS NTWC said.

Image credit: TW/SAM, Google

Estimated population exposure to earthquake shaking

Regional seismicity

Featured image credit: TW/SAM, Google


Commenting rules and guidelines

We value the thoughts and opinions of our readers and welcome healthy discussions on our website. In order to maintain a respectful and positive community, we ask that all commenters follow these rules.

One Comment

Leave a reply

Your email address will not be published. Required fields are marked *