M2.5 earthquake 60 km SE of Adak, Alaska

A magnitude 2.5 earthquake struck 60 km SE of Adak, Alaska on Sat, Jul 11, 2020, 2:01 AM HADT (11:01 UTC), 127 km (79 mi) below the surface.

A larger quake followed: M4.0 72 km NE 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 · ±0.128 · 8 stations
2.1	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: 146 in the 60 days after this one and 84 in the 30 days before it.

The first 60 of 146.

From the USGS Earthquake Hazards Program and its partner networks, event us6000b33y (also filed as ak0208vda1lz). Read Thu, Oct 1, 2026, 3:41 PM UTC.