M4.1 earthquake 117 km SW of Adak, Alaska

A magnitude 4.1 earthquake struck 117 km SW of Adak, Alaska on Thu, Apr 25, 2019, 3:37 PM HADT (00:37 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M6.0 127 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
4.1	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.041 · 162 stations
3.7	ML, local (Richter)	Alaska Earthquake Center	Preliminary

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 179 in the 60 days after this one and 83 in the 30 days before it.

The first 60 of 179.

From the USGS Earthquake Hazards Program and its partner networks, event us70003c9l (also filed as ak0195buk6x9). Read Fri, Oct 2, 2026, 1:58 AM UTC.