Alaska earthquakes

M3.9 earthquake Southern Alaska

A magnitude 3.9 earthquake struck in Southern Alaska on Mon, Oct 30, 2017, 6:10 AM AKDT (14:10 UTC), 102 km (63 mi) below the surface.

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

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Map

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

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The earthquake

Magnitude: 3.9 (ML, local (Richter)), minor
Magnitude from: Alaska Earthquake Center
Local time: Mon, Oct 30, 2017, 6:10 AM AKDT
UTC: 2017-10-30 14:10:23 UTC
Depth: 101.8 km (63.3 mi), intermediate-depth
Epicenter: 59.744° N, 153.141° W
Region: Alaska
Felt reports: 2
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
3.9	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
4.5	mb, body-wave	USGS National Earthquake Information Center	Reviewed · ±0.15 · 15 stations

Did you feel it?

2 people 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: 231

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 ak017dxc8f24 (also filed as ak17120184, us1000ayic). Read Fri, Oct 2, 2026, 2:28 PM UTC.