Alaska earthquakes

M3.7 earthquake 12 km ENE of Adak, Alaska

A magnitude 3.7 earthquake struck 12 km ENE of Adak, Alaska on Fri, Jun 30, 2023, 8:20 PM HADT (05:20 UTC), 116 km (72 mi) below the surface.

A larger quake followed: M4.1 86 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.

Open the live map with earthquakes

The earthquake

Magnitude: 3.7 (mb), minor
Local time: Fri, Jun 30, 2023, 8:20 PM HADT
UTC: 2023-07-01 05:20:40 UTC
Depth: 115.8 km (72.0 mi), intermediate-depth
Epicenter: 51.928° N, 176.473° W
Region: Alaska
Felt reports: 1
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: 0.2% 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 II, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 8.1 km horizontally, 2.6 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 103°
Stations used: 75

Nearby

Within 100 km, magnitude 1.5 and up: at least 200 in the 60 days after this one and 120 in the 30 days before it.

After

The first 60 of at least 200.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000kpde (also filed as ak0238d2wpcu). Read Wed, Sep 30, 2026, 3:29 PM UTC.