M2.5 earthquake 172 km SSE of Adak, Alaska

A magnitude 2.5 earthquake struck 172 km SSE of Adak, Alaska on Wed, Mar 20, 2024, 8:48 PM HADT (05:48 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.8 89 km S 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
2.5	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.121 · 9 stations
2.5	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: 18 in the 60 days after this one and 12 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event us7000mb7j (also filed as ak0243q1snvt). Read Fri, Oct 2, 2026, 8:49 AM UTC.