Alaska earthquakes

M4.8 earthquake 132 km WSW of Adak, Alaska

A magnitude 4.8 earthquake struck 132 km WSW of Adak, Alaska on Wed, May 10, 2017, 5:50 PM HADT (02:50 UTC), 10 km (6 mi) below the surface.

Map

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

Open the live map with earthquakes

The earthquake

Magnitude: 4.8 (Mww, W-phase moment), light
Magnitude from: USGS National Earthquake Information Center
Local time: Wed, May 10, 2017, 5:50 PM HADT
UTC: 2017-05-11 02:50:43 UTC
Depth: 9.5 km (5.9 mi), shallow
Epicenter: 51.632° N, 178.513° W
Region: Alaska
Felt reports: 1
Strongest shaking: IV, light 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
4.8	Mww, W-phase moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.089 · 12 stations
4.8	Mw, moment	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: IV, light shaking
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.

Fault motion and ground failure

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

Faulting: Strike-slip
Moment magnitude: 4.8 Mww
Nodal plane 1: Strike 351°, dip 33°, rake -18°
Nodal plane 2: Strike 97°, dip 80°, rake -122°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 8.1 km horizontally, 4.0 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 125°
Stations used: 196

Nearby

Within 100 km, magnitude 1.8 and up: at least 199 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 199.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us10008rdr (also filed as ak16018762, ak01760ow50q). Read Sat, Oct 3, 2026, 3:06 PM UTC.