Alaska earthquakes

M3.6 earthquake 111 km E of Chignik, Alaska

A magnitude 3.6 earthquake struck 111 km E of Chignik, Alaska on Wed, Jul 11, 2018, 6:57 PM AKDT (02:57 UTC), 46 km (28 mi) below the surface.

Sand Point forecast More in Alaska

Map

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

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The earthquake

Magnitude: 3.6 (ML, local (Richter)), minor
Magnitude from: Alaska Earthquake Center
Local time: Wed, Jul 11, 2018, 6:57 PM AKDT
UTC: 2018-07-12 02:57:49 UTC
Depth: 45.6 km (28.3 mi), shallow
Epicenter: 56.219° N, 156.602° W
Region: Alaska
Strongest shaking: III, weak 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
3.6	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
3.6	ML, local (Richter)	AACSE	Preliminary
4.0	Mwr, regional moment	USGS National Earthquake Information Center	Reviewed · ±0.078 · 16 stations

Shaking

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

Strongest estimated: III, weak shaking
Peak ground acceleration: 275.0% of gravity
Peak ground velocity: 0.2 cm/s
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.

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: 4.0 Mwr
Nodal plane 1: Strike 31°, dip 74°, rake 117°
Nodal plane 2: Strike 149°, dip 31°, rake 33°

How well it is located

Reviewed by a seismologist.

Stations used: 137

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast263 kmENE

Nearby

Within 100 km, magnitude 1.5 and up: 29 in the 60 days after this one and 11 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 ak0188v8964i (also filed as ak19858158, us2000g2ps, aacse0188v8964i). Read Thu, Oct 1, 2026, 9:26 PM UTC.