M1.5 earthquake 76 km SE of Adak, Alaska

A magnitude 1.5 earthquake struck 76 km SE of Adak, Alaska on Tue, Jul 7, 2020, 3:34 PM HADT (00:34 UTC), 50 km (31 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
1.5	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
-0.13	ML, local (Richter)	AV	Final · ±0.138 · 5 stations

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 78 in the 30 days before it.

The first 60 of 146.

From the USGS Earthquake Hazards Program and its partner networks, event ak0208q8bbaj (also filed as av62193571). Read Fri, Oct 2, 2026, 8:19 PM UTC.