M4.0 earthquake 96 km SW of Adak, Alaska

A magnitude 4.0 earthquake struck 96 km SW of Adak, Alaska on Sun, Jul 7, 1996, 4:23 PM HADT (01:23 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M6.0 Andreanof Islands, Aleutian Islands, 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
4.0	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · 6 stations
4.0	mb, body-wave	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: 44 in the 60 days after this one and at least 200 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event usp0007kuc (also filed as ak9968q8ubhg). Read Thu, Oct 1, 2026, 5:49 AM UTC.