Alaska earthquakes

M4.1 earthquake 6 km SW of Point MacKenzie, Alaska

A magnitude 4.1 earthquake struck 6 km SW of Point MacKenzie, Alaska on Tue, Aug 27, 2019, 11:48 PM AKDT (07:48 UTC), 41 km (25 mi) below the surface.

A larger quake followed: M5.2 28 km NW of Susitna, Alaska. This one was a foreshock.

Point MacKenzie 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: 4.1 (ml), light
Local time: Tue, Aug 27, 2019, 11:48 PM AKDT
UTC: 2019-08-28 07:48:25 UTC
Depth: 40.9 km (25.4 mi), shallow
Epicenter: 61.322° N, 150.075° W
Region: Alaska
Felt reports: 827
Strongest shaking: III, weak shaking
Tsunami flag: Yes: a large quake in an oceanic region
Status: Reviewed by a seismologist

Tsunami

The USGS flags a quake this large in an oceanic region. The flag does not mean a tsunami happened; the tsunami warning centers decide that, and their messages are below when they issued any.

Current tsunami warnings: tsunami.gov. Warnings in force in the US also appear on our alerts pages.

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: 318.0% of gravity
Peak ground velocity: 0.5 cm/s
Map: Automatic

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

Did you feel it?

827 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

Fault motion and ground failure

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

Faulting: Normal
Moment magnitude: 4.1 Mwr
Nodal plane 1: Strike 199°, dip 79°, rake -61°
Nodal plane 2: Strike 308°, dip 31°, rake -158°

How well it is located

Reviewed by a seismologist.

Stations used: 179

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 197 in the 60 days after this one and 106 in the 30 days before it.

After

The first 60 of 197.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak019b11fo13 (also filed as at00pwxscp, us7000592u). Read Tue, Sep 29, 2026, 5:20 AM UTC.