M4.6 earthquake 35 km ESE of Adak, Alaska

A magnitude 4.6 earthquake struck 35 km ESE of Adak, Alaska on Thu, Jun 20, 2024, 8:24 AM HADT (17:24 UTC), 59 km (37 mi) below the surface.

A larger quake followed: M5.0 66 km W of Atka, 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
4.6	Mwr, regional moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.089 · 12 stations
4.6	Mwr, regional moment	Alaska Earthquake Center	Preliminary

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 V, moderate shaking.

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

Reviewed by a seismologist.

Within 100 km, magnitude 1.6 and up: at least 199 in the 60 days after this one and 130 in the 30 days before it.

The first 60 of at least 199.

From the USGS Earthquake Hazards Program and its partner networks, event us7000mtm3 (also filed as ak0247wqp7ld). Read Thu, Oct 1, 2026, 8:12 PM UTC.