M1.8 earthquake 58 km W of Adak, Alaska

A magnitude 1.8 earthquake struck 58 km W of Adak, Alaska on Fri, Apr 19, 2024, 3:19 PM HADT (00:19 UTC), 9 km (6 mi) below the surface.

A larger quake followed: M4.0 141 km WSW of Adak, 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
1.8	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
1.76	ML, local (Richter)	AV	Final · ±0.294533894835041 · 12 stations

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: at least 200 in the 60 days after this one and 179 in the 30 days before it.

The first 60 of at least 200.

From the USGS Earthquake Hazards Program and its partner networks, event ak02453kro4p (also filed as av93096591). Read Thu, Oct 1, 2026, 7:01 PM UTC.