Alaska earthquakes

M5.3 earthquake 135 km WSW of Adak, Alaska

A magnitude 5.3 earthquake struck 135 km WSW of Adak, Alaska on Tue, Jun 13, 2023, 7:16 AM HADT (16:16 UTC), 19 km (12 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: 5.3 (Mww, W-phase moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Tue, Jun 13, 2023, 7:16 AM HADT
UTC: 2023-06-13 16:16:02 UTC
Depth: 19.2 km (11.9 mi), shallow
Epicenter: 51.509° N, 178.509° W
Region: Alaska
Felt reports: 1
Strongest shaking: VI, strong 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
5.3	Mww, W-phase moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.038 · 68 stations
5.3	Mww, W-phase moment	Alaska Earthquake Center	Preliminary
5.0	ML, local (Richter)	NOAA National Tsunami Warning Center	Reviewed · 15 stations
5.3	Mww, W-phase moment	USGS, automatic first solution	First automatic solution · Confirmed

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: VI, strong shaking
Peak ground acceleration: 18.4% of gravity
Peak ground velocity: 2.0 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 V, moderate shaking.

Fault motion and ground failure

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

Faulting: Strike-slip
Moment magnitude: 5.3 Mww
Nodal plane 1: Strike 284°, dip 50°, rake -157°
Nodal plane 2: Strike 179°, dip 73°, rake -43°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 3.0 km horizontally, 3.1 km in depth
Magnitude uncertainty: ±0.04
Depth from: From location
Station coverage gap: 78°
Stations used: 151

Nearby

Within 100 km, magnitude 2.3 and up: 75 in the 60 days after this one and 49 in the 30 days before it.

After

The first 60 of 75.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000k86m (also filed as at00rw796s, usauto7000k86m, av91924751, ak0237jhra9p). Read Fri, Oct 2, 2026, 1:11 AM UTC.