Alaska earthquakes

M5.3 earthquake 191 km WSW of Adak, Alaska

A magnitude 5.3 earthquake struck 191 km WSW of Adak, Alaska on Tue, Feb 14, 2023, 9:35 PM HAST (07:35 UTC), 35 km (22 mi) below the surface.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 5.3 (mww), moderate
Local time: Tue, Feb 14, 2023, 9:35 PM HAST
UTC: 2023-02-15 07:35:22 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.218° N, 179.186° W
Region: Alaska
Felt reports: 1
Strongest shaking: IV, light shaking
Tsunami flag: Yes: a large quake in an oceanic region
Status: Reviewed by a seismologist

Tsunami

The USGS flags a quake this large in an oceanic region. The flag does not mean a tsunami happened; the tsunami warning centers decide that, and their messages are below when they issued any.

Current tsunami warnings: tsunami.gov. Warnings in force in the US also appear on our alerts pages.

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: IV, light shaking
Peak ground acceleration: 4.4% of gravity
Peak ground velocity: 0.4 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Oblique reverse
Moment magnitude: 5.3 Mww
Nodal plane 1: Strike 284°, dip 33°, rake 130°
Nodal plane 2: Strike 60°, dip 66°, rake 68°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 6.5 km horizontally, 1.7 km in depth
Magnitude uncertainty: ±0.06
Depth from: Operator assigned
Station coverage gap: 51°
Stations used: 174

Nearby

Within 100 km, magnitude 2.3 and up: 68 in the 60 days after this one and 36 in the 30 days before it.

After

The first 60 of 68.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000jp24 (also filed as at00rq42f0, usauto6000jp24, ak0232473kgo). Read Wed, Sep 30, 2026, 4:12 AM UTC.