Alaska earthquakes

M3.8 earthquake 56 km SW of Tatitlek, Alaska

A magnitude 3.8 earthquake struck 56 km SW of Tatitlek, Alaska on Tue, Aug 21, 2018, 9:43 PM AKDT (05:43 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M4.0 56 km SSE of Glacier View, 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: 3.8 (ML, local (Richter)), minor
Magnitude from: Alaska Earthquake Center
Local time: Tue, Aug 21, 2018, 9:43 PM AKDT
UTC: 2018-08-22 05:43:06 UTC
Depth: 6.9 km (4.3 mi), shallow
Epicenter: 60.479° N, 147.364° W
Region: Alaska
Felt reports: 6
Strongest shaking: IV, light shaking
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
3.8	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
3.8	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed

What happened

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

Also felt at Valdez.

From the USGS event page for ak018ar2zlux. U.S. Geological Survey text and figures are in the public domain.

Shaking

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

Strongest estimated: IV, light shaking
Peak ground acceleration: 179.0% of gravity
Peak ground velocity: 0.9 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

6 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

How well it is located

Reviewed by a seismologist.

Stations used: 160

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 68 in the 60 days after this one and 29 in the 30 days before it.

After

The first 60 of 68.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak018ar2zlux (also filed as ak20140217, us1000gf6n). Read Thu, Oct 1, 2026, 9:23 AM UTC.