Alaska earthquakes

M1.8 earthquake 208 km W of Adak, Alaska

A magnitude 1.8 earthquake struck 208 km W of Adak, Alaska on Fri, Jul 21, 2017, 3:17 PM HADT (00:17 UTC), 70 km (43 mi) below the surface.

A larger quake followed: M5.1 125 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 1.8 (ML, local (Richter)), micro
Magnitude from: Alaska Earthquake Center
Local time: Fri, Jul 21, 2017, 3:17 PM HADT
UTC: 2017-07-22 00:17:31 UTC
Depth: 70.0 km (43.5 mi), intermediate-depth
Epicenter: 51.583° N, 179.619° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Stations used: 16

Nearby

Within 100 km, magnitude 1.5 and up: at least 201 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 201.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak0179bq75ts (also filed as ak16360277). Read Fri, Oct 2, 2026, 12:23 PM UTC.