M4.0 earthquake 59 km WNW of Ninilchik, Alaska

A magnitude 4.0 earthquake struck 59 km WNW of Ninilchik, Alaska on Tue, Apr 29, 2025, 6:14 PM AKDT (02:14 UTC), 108 km (67 mi) below the surface.

A larger quake followed: M4.3 50 km E of Port Alsworth, 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
4.0	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
4.2	Mwr, regional moment	USGS National Earthquake Information Center	Reviewed · ±0.058 · 29 stations

The USGS’s account of the effects of this earthquake.

Also felt at Kasilof.

From the USGS event page for ak0255ihrlkl. U.S. Geological Survey text and figures are in the public domain.

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

5 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

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

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

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

The first 60 of at least 200.

From the USGS Earthquake Hazards Program and its partner networks, event ak0255ihrlkl (also filed as us7000pw0f). Read Sat, Oct 3, 2026, 5:47 AM UTC.