M3.7 earthquake 86 km SE of Chignik, Alaska

A magnitude 3.7 earthquake struck 86 km SE of Chignik, Alaska on Wed, Sep 18, 2024, 9:32 PM AKDT (05:32 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M3.9 174 km ESE of Chignik, Alaska. This one was a foreshock.

Map

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

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
3.7	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
4.1	mb, body-wave	USGS National Earthquake Information Center	Reviewed · ±0.262 · 4 stations

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

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 28 in the 60 days after this one and 22 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event ak024c31ib0y (also filed as us6000nszw). Read Sat, Oct 3, 2026, 2:12 AM UTC.