M4.7 earthquake 54 km SW of Adak, Alaska

A magnitude 4.7 earthquake struck 54 km SW of Adak, Alaska on Wed, Oct 23, 1996, 7:17 AM HADT (16:17 UTC), 42 km (26 mi) below the surface.

A larger quake followed: M5.4 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
4.7	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · 18 stations
4.7	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 1.7 and up: 29 in the 60 days after this one and 4 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event usp0007rud (also filed as ak996dng8pic). Read Sat, Oct 3, 2026, 9:25 AM UTC.