Alaska earthquakes

M5.2 earthquake 148 km WSW of Adak, Alaska

A magnitude 5.2 earthquake struck 148 km WSW of Adak, Alaska on Tue, Apr 15, 2025, 6:49 PM HADT (03:49 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: 5.2 (Mwr, regional moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Apr 15, 2025, 6:49 PM HADT
UTC: 2025-04-16 03:49:49 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.196° N, 178.470° W
Region: Alaska
Felt reports: 3
Strongest shaking: II, weak shaking
Tsunami flag: Yes: a large quake in an oceanic region
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
5.2	Mwr, regional moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.083 · 14 stations
5.2	Mwr, regional moment	Alaska Earthquake Center	Preliminary
5.1	ML, local (Richter)	NOAA National Tsunami Warning Center	Reviewed · 14 stations

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: II, weak shaking
Peak ground acceleration: 0.1% of gravity
Peak ground velocity: 0.0 cm/s
Map: Automatic

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

Did you feel it?

3 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Fault motion and ground failure

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

Faulting: Reverse (thrust)
Moment magnitude: 5.2 Mwr
Nodal plane 1: Strike 68°, dip 69°, rake 78°
Nodal plane 2: Strike 278°, dip 24°, rake 118°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 3.8 km horizontally, 1.8 km in depth
Magnitude uncertainty: ±0.08
Depth from: Operator assigned
Station coverage gap: 126°
Stations used: 170

Nearby

Within 100 km, magnitude 2.2 and up: 80 in the 60 days after this one and 48 in the 30 days before it.

After

The first 60 of 80.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000q6d9 (also filed as at00suslb2, ak0254vd1oxm). Read Sun, Oct 4, 2026, 4:28 AM UTC.