M2.5 earthquake 101 km SSW of Unalaska, Alaska

A magnitude 2.5 earthquake struck 101 km SSW of Unalaska, Alaska on Mon, Aug 5, 2019, 5:56 PM AKDT (01:56 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M5.3 139 km ESE of Nikolski, 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
2.5	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed
2.5	ML, local (Richter)	Alaska Earthquake Center	Preliminary

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: 116 in the 60 days after this one and 79 in the 30 days before it.

The first 60 of 116.

From the USGS Earthquake Hazards Program and its partner networks, event us700058s9 (also filed as ak019a0k36h5). Read Thu, Oct 1, 2026, 4:42 AM UTC.