Alaska earthquakes

M3.6 earthquake 146 km ENE of Atka, Alaska

A magnitude 3.6 earthquake struck 146 km ENE of Atka, Alaska on Fri, Apr 22, 2016, 2:15 AM HADT (11:15 UTC), 100 km (62 mi) below the surface.

A larger quake followed: M3.7 174 km ESE 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: 3.6 (ML, local (Richter)), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Fri, Apr 22, 2016, 2:15 AM HADT
UTC: 2016-04-22 11:15:40 UTC
Depth: 100.3 km (62.3 mi), intermediate-depth
Epicenter: 52.684° N, 172.204° 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
3.6	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.148 · 6 stations
2.8	ML, local (Richter)	Alaska Earthquake Center	Preliminary

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 13.5 km horizontally, 9.1 km in depth
Magnitude uncertainty: ±0.15
Stations used: 21

Nearby

Within 100 km, magnitude 1.5 and up: 31 in the 60 days after this one and 5 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us10005cb9 (also filed as ak13490443, ak016572dafy). Read Sun, Oct 4, 2026, 12:41 PM UTC.