Alaska earthquakes

M4.0 earthquake 13 km E of Ninilchik, Alaska

A magnitude 4.0 earthquake struck 13 km E of Ninilchik, Alaska on Sun, Jun 24, 2018, 10:33 AM AKDT (18:33 UTC), 75 km (47 mi) below the surface.

A larger quake followed: M4.3 29 km SE of Seldovia Village, Alaska. This one was a foreshock.

Ninilchik 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: 4.0 (ML, local (Richter)), light
Magnitude from: Alaska Earthquake Center
Local time: Sun, Jun 24, 2018, 10:33 AM AKDT
UTC: 2018-06-24 18:33:00 UTC
Depth: 75.4 km (46.9 mi), intermediate-depth
Epicenter: 60.033° N, 151.434° W
Region: Alaska
Felt reports: 45
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
4.0	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
4.0	Mwr, regional moment	USGS National Earthquake Information Center	Reviewed · ±0.038 · 68 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: 216.0% 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?

45 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

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: 4.0 Mwr
Nodal plane 1: Strike 143°, dip 58°, rake 148°
Nodal plane 2: Strike 252°, dip 63°, rake 37°

How well it is located

Reviewed by a seismologist.

Stations used: 260

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and 143 in the 30 days before it.

After

The first 60 of at least 199.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak01881pylyd (also filed as ak19798433, us1000f0ff). Read Fri, Oct 2, 2026, 7:08 AM UTC.