Alaska earthquakes

M5.7 earthquake 75 km S of Atka, Alaska

A magnitude 5.7 earthquake struck 75 km S of Atka, Alaska on Wed, May 7, 1986, 2:36 PM HADT (23:36 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M6.5 25 km NW of Atka, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 5.7 (mb, body-wave), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Wed, May 7, 1986, 2:36 PM HADT
UTC: 1986-05-07 23:36:18 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 51.518° N, 174.150° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

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
5.7	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · 30 stations
6.02	Mw, moment	ISC-GEM global catalog	Final · ±0.38
5.7	mb, body-wave	USGS historic United States catalog	Final

What happened

The USGS’s account of the effects of this earthquake.

Maximum observed Modified Mercalli Intensity (MMI) I

From the USGS event page for usp0002tne. U.S. Geological Survey text and figures are in the public domain.

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Depth from: OPERATOR_ASSIGNED

Nearby

Within 100 km, magnitude 2.7 and up: 169 in the 60 days after this one and 25 in the 30 days before it.

After

The first 60 of 169.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002tne (also filed as ushis3934, iscgem494957). Read Sat, Oct 3, 2026, 4:42 PM UTC.