M3.7 earthquake 146 km SE of Perryville, Alaska

A magnitude 3.7 earthquake struck 146 km SE of Perryville, Alaska on Fri, Jul 30, 2021, 1:57 AM AKDT (09:57 UTC), 27 km (17 mi) below the surface.

A larger quake followed: M6.9 125 km SE of Perryville, Alaska. This one was a foreshock.

Map

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

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

1 person reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

The USGS PAGER system estimates deaths and economic losses from the shaking and the population and buildings exposed to it.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: at least 202 in the 60 days after this one and at least 200 in the 30 days before it.

The first 60 of at least 202.

From the USGS Earthquake Hazards Program and its partner networks, event ak0219p43fgh. Read Wed, Sep 30, 2026, 9:08 AM UTC.