Alaska earthquakes

M5.2 earthquake 52 km WNW of Adak, Alaska

A magnitude 5.2 earthquake struck 52 km WNW of Adak, Alaska on Tue, Jul 14, 2020, 11:59 PM HADT (08:59 UTC), 12 km (7 mi) below the surface.

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

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The earthquake

Magnitude: 5.2 (mww), moderate
Local time: Tue, Jul 14, 2020, 11:59 PM HADT
UTC: 2020-07-15 08:59:54 UTC
Depth: 11.8 km (7.3 mi), shallow
Epicenter: 51.979° N, 177.377° W
Region: Alaska
Felt reports: 2
Tsunami flag: Yes: a large quake in an oceanic region
Status: Reviewed by a seismologist

Tsunami

The USGS flags a quake this large in an oceanic region. The flag does not mean a tsunami happened; the tsunami warning centers decide that, and their messages are below when they issued any.

Current tsunami warnings: tsunami.gov. Warnings in force in the US also appear on our alerts pages.

Did you feel it?

2 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Strike-slip
Moment magnitude: 5.2 Mww
Nodal plane 1: Strike 176°, dip 65°, rake 9°
Nodal plane 2: Strike 82°, dip 82°, rake 155°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 2.4 km horizontally, 1.6 km in depth
Magnitude uncertainty: ±0.04
Depth from: From location
Station coverage gap: 22°
Stations used: 114

Nearby

Within 100 km, magnitude 2.2 and up: 38 in the 60 days after this one and 25 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 us7000antd (also filed as at00qdi6bv, ak02091xzljz, av61907958, iscgem618680826). Read Tue, Sep 29, 2026, 5:30 AM UTC.