M2.5 earthquake 4 km NW of Tanaina, Alaska

A magnitude 2.5 earthquake struck 4 km NW of Tanaina, Alaska on Sun, May 30, 2021, 7:09 PM AKDT (03:09 UTC), 29 km (18 mi) below the surface.

A larger quake followed: M4.0 16 km WSW of Trapper Creek, 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)	Alaska Earthquake Center	Preferred · Preliminary
2.7	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.03 · 150 stations

2 people 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: 196 in the 60 days after this one and 115 in the 30 days before it.

The first 60 of 196.

From the USGS Earthquake Hazards Program and its partner networks, event ak0216xrzond (also filed as us6000eg3y). Read Thu, Oct 1, 2026, 7:57 PM UTC.