Alaska earthquakes

M5.2 earthquake 97 km SSW of Atka, Alaska

A magnitude 5.2 earthquake struck 97 km SSW of Atka, Alaska on Sun, Jul 8, 2018, 5:42 PM HADT (02:42 UTC), 18 km (11 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: 5.2 (Mww, W-phase moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Sun, Jul 8, 2018, 5:42 PM HADT
UTC: 2018-07-09 02:42:25 UTC
Depth: 17.9 km (11.2 mi), shallow
Epicenter: 51.365° N, 174.646° 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
5.2	Mww, W-phase moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.063 · 24 stations
5.19	Mw, moment	ISC-GEM global catalog	Final · ±0.1
5.2	Mw, moment	Alaska Earthquake Center	Preliminary

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: Reverse (thrust)
Moment magnitude: 5.2 Mww
Nodal plane 1: Strike 259°, dip 23°, rake 105°
Nodal plane 2: Strike 62°, dip 67°, rake 83°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.8 km horizontally, 3.8 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 116°
Stations used: 185

Nearby

Within 100 km, magnitude 2.2 and up: 44 in the 60 days after this one and 27 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 us2000g011 (also filed as ak0188q9jv54, ak19851507, iscgem612288100). Read Thu, Oct 1, 2026, 7:11 PM UTC.