M3.8 earthquake 134 km W of Adak, Alaska

A magnitude 3.8 earthquake struck 134 km W of Adak, Alaska on Fri, Jul 18, 2025, 9:34 PM HADT (06:34 UTC), 168 km (105 mi) below the surface.

A larger quake followed: M4.8 54 km W of Adak, Alaska. This one was a foreshock.

Map

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

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
3.8	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.074 · 48 stations
3.6	ML, local (Richter)	Alaska Earthquake Center	Preliminary

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 151 in the 60 days after this one and 121 in the 30 days before it.

The first 60 of 151.

From the USGS Earthquake Hazards Program and its partner networks, event us7000qdrt (also filed as ak02596v9d6t). Read Mon, Oct 5, 2026, 8:42 AM UTC.