Alaska earthquakes

M4.9 earthquake 36 km ESE of Adak, Alaska

A magnitude 4.9 earthquake struck 36 km ESE of Adak, Alaska on Tue, Jan 30, 2018, 1:49 AM HAST (11:49 UTC), 56 km (35 mi) below the surface.

A larger quake followed: M5.2 22 km SSW 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: 4.9 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Jan 30, 2018, 1:49 AM HAST
UTC: 2018-01-30 11:49:28 UTC
Depth: 56.1 km (34.9 mi), shallow
Epicenter: 51.732° N, 176.157° W
Region: Alaska
Felt reports: 2
Strongest shaking: III, weak shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
4.9	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.04 · 192 stations
4.9	mb, body-wave	Alaska Earthquake Center	Preliminary

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
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 III, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.8 km horizontally, 5.2 km in depth
Magnitude uncertainty: ±0.04
Depth from: From location
Station coverage gap: 132°
Stations used: 186

Nearby

Within 100 km, magnitude 1.9 and up: 89 in the 60 days after this one and 70 in the 30 days before it.

After

The first 60 of 89.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000cr8s (also filed as ak0181dsyqny, ak18238740). Read Fri, Oct 2, 2026, 7:44 AM UTC.