Alaska earthquakes

M4.6 earthquake 80 km NNE of Adak, Alaska

A magnitude 4.6 earthquake struck 80 km NNE of Adak, Alaska on Thu, May 18, 2023, 4:13 AM HADT (13:13 UTC), 195 km (121 mi) below the surface.

Map

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The earthquake

Magnitude: 4.6 (mb), light
Local time: Thu, May 18, 2023, 4:13 AM HADT
UTC: 2023-05-18 13:13:19 UTC
Depth: 195.0 km (121.2 mi), intermediate-depth
Epicenter: 52.568° N, 176.309° W
Region: Alaska
Felt reports: 1
Strongest shaking: II, 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: II, weak shaking
Peak ground acceleration: 0.1% of gravity
Peak ground velocity: -3.4 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 III, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.5 km horizontally, 3.3 km in depth
Magnitude uncertainty: ±0.03
Depth from: From location
Station coverage gap: 56°
Stations used: 70

Nearby

Within 100 km, magnitude 1.6 and up: 33 in the 60 days after this one and 18 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000kct6 (also filed as ak0236cfzdg7). Read Wed, Sep 30, 2026, 11:20 PM UTC.