Alaska earthquakes

M5.3 earthquake 105 km S of Adak, Alaska

A magnitude 5.3 earthquake struck 105 km S of Adak, Alaska on Tue, May 9, 2017, 12:01 AM HADT (09:01 UTC), 19 km (12 mi) below the surface.

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

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The earthquake

Magnitude: 5.3 (Mww, W-phase moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, May 9, 2017, 12:01 AM HADT
UTC: 2017-05-09 09:01:57 UTC
Depth: 19.0 km (11.8 mi), shallow
Epicenter: 50.928° N, 176.808° W
Region: Alaska
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
5.3	Mww, W-phase moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.086 · 13 stations
5.39	Mw, moment	ISC-GEM global catalog	Final · ±0.1
5.4	Mw, moment	Alaska Earthquake Center	Preliminary
5.3	Mwb, body-wave moment	USGS National Earthquake Information Center	Moment tensor · Reviewed

Did you feel it?

No one has reported feeling this quake to the USGS.

Fault motion and ground failure

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

Faulting: Oblique reverse
Moment magnitude: 5.3 Mww
Nodal plane 1: Strike 284°, dip 26°, rake 122°
Nodal plane 2: Strike 70°, dip 68°, rake 76°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.6 km horizontally, 1.7 km in depth
Magnitude uncertainty: ±0.09
Depth from: From modeling of broad-band P waveforms
Station coverage gap: 40°
Stations used: 315

Nearby

Within 100 km, magnitude 2.3 and up: 61 in the 60 days after this one and 28 in the 30 days before it.

After

The first 60 of 61.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us10008qrs (also filed as ak16008069, ak0175xhp0fq, iscgem610618945). Read Fri, Oct 2, 2026, 10:34 PM UTC.