Alaska earthquakes

M4.6 earthquake 240 km WNW of Adak, Alaska

A magnitude 4.6 earthquake struck 240 km WNW of Adak, Alaska on Thu, Sep 15, 2022, 5:02 AM HADT (14:02 UTC), 233 km (145 mi) below the surface.

Map

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

Open the live map with earthquakes

The earthquake

Magnitude: 4.6 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Thu, Sep 15, 2022, 5:02 AM HADT
UTC: 2022-09-15 14:02:38 UTC
Depth: 232.6 km (144.6 mi), intermediate-depth
Epicenter: 52.587° N, 179.965° W
Region: Alaska
Felt reports: 1
Strongest shaking: II, weak shaking
Tsunami flag: Yes: a large quake in an oceanic region
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
4.6	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.029 · 353 stations
4.6	mb, body-wave	Alaska Earthquake Center	Preliminary
5.1	mb, body-wave	NOAA National Tsunami Warning Center	Reviewed · 55 stations

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: II, weak shaking
Peak ground acceleration: 0.1% of gravity
Peak ground velocity: -4.3 cm/s
Map: Automatic

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

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 9.4 km horizontally, 6.8 km in depth
Magnitude uncertainty: ±0.03
Depth from: From location
Station coverage gap: 58°
Stations used: 75

Nearby

Within 100 km, magnitude 1.6 and up: 18 in the 60 days after this one and 12 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 us7000i89p (also filed as at00ri98c9, ak022bux04b3). Read Fri, Oct 2, 2026, 7:39 PM UTC.