⊕earthquakeactive

M4.5 Earthquake — 111 km ESE of Atka, Alaska

M4.5

51.6994°N, 172.7931°W·US-AK

Started 5d ago

USGS data as of 15:50 UTC

Event Details

Typeearthquake

SeverityM4.5

Statusactive

Location51.6994°N, 172.7931°W (AK)

Started2026-10-31T18:51:02.721+00:00

Last Updated2026-11-01T18:50:38.632+00:00

Sourceusgs

Source URLearthquake.usgs.gov

Confidence1.00

Impact Zones — modeled

Moderate Impact Zone

Light to moderate damage. Check structures for damage.

25.5 km

Affected Zone

Shaking felt. Minor damage possible in vulnerable structures.

142.9 km

Zone estimates are based on scientific models and may differ from actual local conditions.

Impact Analysis

Population Exposed7,232

Structures in Zone389

Schools1

Fire Stations1

Population from ACS 5-Year 2022 tract sampling; structure counts from Microsoft Building Footprints or Census ACS housing data, capped by USGS NLCD 2021 developed land. Estimates for situational awareness — not for actuarial, regulatory, or underwriting use.

Historical Comparison

2017 AK Earthquake47% match

M5.4 Earthquake in AK, 43km from current event

2016 AK Earthquake40% match

M5.4 Earthquake in AK, 77km from current event

2011 AK Earthquake38% match

M5.4 Earthquake in AK, 80km from current event

Historical comparison based on peril type, geography, and severity. Past events do not predict future outcomes.

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Zone estimates are based on scientific models and may differ from actual local conditions.