Alaska earthquakes

M5.0 earthquake 25 km SW of Adak, Alaska

A magnitude 5.0 earthquake struck 25 km SW of Adak, Alaska on Fri, Feb 15, 2019, 8:11 AM HAST (18:11 UTC), 55 km (34 mi) below the surface.

A larger quake followed: M5.2 122 km WSW of Adak, Alaska. This one was a foreshock.

Map

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

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The earthquake

Magnitude: 5.0 (Mww, W-phase moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Fri, Feb 15, 2019, 8:11 AM HAST
UTC: 2019-02-15 18:11:47 UTC
Depth: 54.6 km (33.9 mi), shallow
Epicenter: 51.721° N, 176.907° W
Region: Alaska
Felt reports: 2
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
5.0	Mww, W-phase moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.089 · 12 stations
5.04	Mw, moment	ISC-GEM global catalog	Final · ±0.1
4.8	ML, local (Richter)	Alaska Earthquake Center	Preliminary

Did you feel it?

2 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: 5.0 Mww
Nodal plane 1: Strike 285°, dip 38°, rake 131°
Nodal plane 2: Strike 58°, dip 63°, rake 63°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 7.1 km horizontally, 4.3 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 139°
Stations used: 230

Nearby

Within 100 km, magnitude 2.0 and up: 82 in the 60 days after this one and 44 in the 30 days before it.

After

The first 60 of 82.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000jiim (also filed as ak01924di82c, iscgem614785346). Read Thu, Oct 1, 2026, 4:52 PM UTC.