Alaska earthquakes

M3.0 earthquake 74 km WNW of Ninilchik, Alaska

A magnitude 3.0 earthquake struck 74 km WNW of Ninilchik, Alaska on Thu, Sep 21, 2017, 12:38 AM AKDT (08:38 UTC), 134 km (83 mi) below the surface.

A larger quake followed: M4.8 68 km E of Port Alsworth, Alaska. This one was a foreshock.

Ninilchik forecast More in Alaska

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.0 (ML, local (Richter)), minor
Magnitude from: Alaska Earthquake Center
Local time: Thu, Sep 21, 2017, 12:38 AM AKDT
UTC: 2017-09-21 08:38:10 UTC
Depth: 134.3 km (83.5 mi), intermediate-depth
Epicenter: 60.239° N, 152.958° W
Region: Alaska
Felt reports: 1
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

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
3.0	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
3.0	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

How well it is located

Reviewed by a seismologist.

Stations used: 167

Nearest places

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

Nearby

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.

After

The first 60 of at least 200.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak017c4qv99a (also filed as ak16874715, us2000asdl). Read Sun, Oct 4, 2026, 7:37 AM UTC.