Alaska earthquakes

M4.4 earthquake 244 km WSW of Adak, Alaska

A magnitude 4.4 earthquake struck 244 km WSW of Adak, Alaska on Tue, Aug 22, 2017, 12:10 PM GMT-12 (00:10 UTC), 10 km (6 mi) below the surface.

Map

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

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The earthquake

Magnitude: 4.4 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Aug 22, 2017, 12:10 PM GMT-12
UTC: 2017-08-23 00:10:52 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 51.010° N, 179.873° W
Region: Alaska
Strongest shaking: II, weak shaking
PAGER alert: Green
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
4.4	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.051 · 110 stations
4.4	mb, body-wave	Alaska Earthquake Center	Preliminary

Shaking

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

Strongest estimated: II, weak shaking
Map: Automatic

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

Did you feel it?

No one has reported feeling this quake to the USGS.

Estimated impact

The USGS PAGER system estimates deaths and economic losses from the shaking and the population and buildings exposed to it.

Alert level: Green: little or no damage or loss of life expected

Deaths: estimated chance of each range
Range	Chance
Under 1	69%
1 to 10	29%
10 to 100	2%
100 to 1,000	Under 1%
1,000 to 10,000	Under 1%
10,000 to 100,000	Under 1%
100,000 to 10,000,000	Under 1%

Economic losses: estimated chance of each range
Range, million USD	Chance
Under 1	65%
1 to 10	30%
10 to 100	4%
100 to 1,000	Under 1%
1,000 to 10,000	Under 1%
10,000 to 100,000	Under 1%
100,000 to 10,000,000	Under 1%

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.2 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.05
Depth from: Operator assigned
Station coverage gap: 188°, poorly surrounded by stations
Stations used: 146

Nearby

Within 100 km, magnitude 1.5 and up: 58 in the 60 days after this one and 62 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000aatv (also filed as ak16626398, ak017asncter). Read Fri, Oct 2, 2026, 9:59 AM UTC.