Alaska earthquakes

M5.0 earthquake 272 km W of Adak, Alaska

A magnitude 5.0 earthquake struck 272 km W of Adak, Alaska on Thu, Jun 22, 2017, 7:20 AM GMT+12 (19:20 UTC), 159 km (99 mi) below the surface.

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The earthquake

Magnitude: 5.0 (mb, body-wave), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Thu, Jun 22, 2017, 7:20 AM GMT+12
UTC: 2017-06-21 19:20:27 UTC
Depth: 159.3 km (99.0 mi), intermediate-depth
Epicenter: 52.176° N, 179.423° E
Region: Alaska
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
5.0	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.026 · 454 stations
5.0	Mw, moment	ISC-GEM global catalog	Final · ±0.1
5.0	Mw, moment	Alaska Earthquake Center	Preliminary
5.5	mb, body-wave	NOAA National Tsunami Warning Center	Reviewed · 33 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.

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 7.3 km horizontally, 4.9 km in depth
Magnitude uncertainty: ±0.03
Depth from: From location
Station coverage gap: 43°
Stations used: 115

Nearby

Within 100 km, magnitude 2.0 and up: 59 in the 60 days after this one and 27 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 us20009nwi (also filed as ak16210866, at00orwwe2, ak0177wrv9x4, iscgem610690710). Read Sat, Oct 3, 2026, 1:16 AM UTC.