M4.3 earthquake 124 km SW of Adak, Alaska

A magnitude 4.3 earthquake struck 124 km SW of Adak, Alaska on Thu, Sep 19, 1996, 5:18 AM HADT (14:18 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.2 142 km WSW 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
4.3	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · 9 stations
4.3	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: 10 in the 60 days after this one and 13 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event usp0007q4f (also filed as ak996c36sbgd). Read Thu, Oct 1, 2026, 5:05 AM UTC.