M2.7 earthquake 102 km ESE of Adak, Alaska

A magnitude 2.7 earthquake struck 102 km ESE of Adak, Alaska on Sat, Aug 29, 2020, 1:52 PM HADT (22:52 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M5.3 76 km SW of Atka, 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
2.7	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.128 · 8 stations
2.2	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: 138 in the 60 days after this one and 82 in the 30 days before it.

The first 60 of 138.

From the USGS Earthquake Hazards Program and its partner networks, event us7000bp0u (also filed as ak020b4lgqyi). Read Thu, Oct 1, 2026, 7:53 AM UTC.