Alaska earthquakes

M5.3 earthquake 88 km SSW of Atka, Alaska

A magnitude 5.3 earthquake struck 88 km SSW of Atka, Alaska on Sat, Jul 4, 1987, 3:06 PM HADT (00:06 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.6 85 km SSW of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 5.3 (mw), moderate
Local time: Sat, Jul 4, 1987, 3:06 PM HADT
UTC: 1987-07-05 00:06:10 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 51.465° N, 174.690° 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.

Depth from: OPERATOR_ASSIGNED

Nearby

Within 100 km, magnitude 2.3 and up: 13 in the 60 days after this one and 4 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00036b9 (also filed as gcmtb070587a, gcmt19870705000611, iscgem461299). Read Tue, Sep 22, 2026, 12:12 PM UTC.