Alaska earthquakes

M4.5 earthquake 91 km ESE of Adak, Alaska

A magnitude 4.5 earthquake struck 91 km ESE of Adak, Alaska on Fri, Apr 7, 2023, 10:17 PM HADT (07:17 UTC), 55 km (34 mi) below the surface.

A larger quake followed: M4.7 81 km NE of Adak, Alaska. This one was a foreshock.

Map

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

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The earthquake

Magnitude: 4.5 (mb), light
Local time: Fri, Apr 7, 2023, 10:17 PM HADT
UTC: 2023-04-08 07:17:42 UTC
Depth: 55.1 km (34.2 mi), shallow
Epicenter: 51.720° N, 175.324° W
Region: Alaska
Felt reports: 2
Strongest shaking: III, weak shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

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

Strongest estimated: III, weak shaking
Peak ground acceleration: 0.4% of gravity
Peak ground velocity: -1.7 cm/s
Map: Automatic

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

Did you feel it?

2 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.7 km horizontally, 5.9 km in depth
Magnitude uncertainty: ±0.04
Depth from: From location
Station coverage gap: 131°
Stations used: 168

Nearby

Within 100 km, magnitude 1.5 and up: 138 in the 60 days after this one and 73 in the 30 days before it.

After

The first 60 of 138.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000k2u4 (also filed as ak0234i6xrxv). Read Wed, Sep 30, 2026, 5:35 PM UTC.