Alaska earthquakes

M2.5 earthquake 259 km W of Adak, Alaska

A magnitude 2.5 earthquake struck 259 km W of Adak, Alaska on Sun, Jul 30, 2017, 4:49 PM GMT+12 (04:49 UTC), 172 km (107 mi) below the surface.

A larger quake followed: M4.6 Rat Islands, Aleutian Islands, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 2.5 (ML, local (Richter)), micro
Magnitude from: USGS National Earthquake Information Center
Local time: Sun, Jul 30, 2017, 4:49 PM GMT+12
UTC: 2017-07-30 04:49:33 UTC
Depth: 171.5 km (106.6 mi), intermediate-depth
Epicenter: 52.080° N, 179.603° E
Region: Alaska
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
2.5	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed
2.5	ML, local (Richter)	Alaska Earthquake Center	Preliminary

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 12.2 km horizontally, 5.9 km in depth
Depth from: From location
Station coverage gap: 192°, poorly surrounded by stations
Stations used: 17

Nearby

Within 100 km, magnitude 1.5 and up: 79 in the 60 days after this one and 41 in the 30 days before it.

After

The first 60 of 79.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000a7d7 (also filed as ak16497822, ak0179p12jd2). Read Fri, Oct 2, 2026, 12:51 PM UTC.