M3.7 earthquake 77 km SW of Unalaska, Alaska

A magnitude 3.7 earthquake struck 77 km SW of Unalaska, Alaska on Thu, Apr 4, 2024, 11:59 AM AKDT (19:59 UTC), 87 km (54 mi) below the surface.

A larger quake followed: M4.6 87 km SSW of Unalaska, 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	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.16 · 10 stations
3.4	ML, local (Richter)	Alaska Earthquake Center	Preliminary

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

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 113 in the 60 days after this one and 68 in the 30 days before it.

The first 60 of 113.

From the USGS Earthquake Hazards Program and its partner networks, event us7000m9yu (also filed as ak0244dfpv66). Read Thu, Oct 1, 2026, 2:30 PM UTC.