Alaska earthquakes

M6.7 earthquake 273 km WSW of Adak, Alaska

A magnitude 6.7 earthquake struck 273 km WSW of Adak, Alaska on Wed, Mar 26, 1997, 2:08 PM GMT+12 (02:08 UTC), 33 km (21 mi) below the surface.

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

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The earthquake

Magnitude: 6.7 (Mwc, centroid moment), strong
Magnitude from: USGS National Earthquake Information Center
Local time: Wed, Mar 26, 1997, 2:08 PM GMT+12
UTC: 1997-03-26 02:08:57 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 51.277° N, 179.533° E
Region: Alaska
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
6.7	Mwc, centroid moment	USGS National Earthquake Information Center	Preferred · Reviewed
6.65	Mw, moment	ISC-GEM global catalog	Final · ±0.1
6.6	Mwc, centroid moment	Global CMT project	Preliminary
6.07	Me, energy	Choy, USGS energy magnitude	Reviewed
6.7	Mww, W-phase moment	Duputel, W-phase inversion	Preliminary
6.6	Mw, moment	Alaska Earthquake Center	Preliminary

What happened

The USGS’s account of the effects of this earthquake.

Felt (IV) on Adak. This shallow-dipping thrust earthquake is located very near the eastern end of the rupture zone of the February 4, 1965 magnitude 8.7 (Mw) earthquake, which is also the eastern boundary of the Rat Island block.

From the USGS event page for usp0007zea. U.S. Geological Survey text and figures are in the public domain.

Did you feel it?

No one has reported feeling this quake to the USGS.

Fault motion and ground failure

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

Faulting: Reverse (thrust)
Moment magnitude: 6.7 Mww
Nodal plane 1: Strike 257°, dip 23°, rake 100°
Nodal plane 2: Strike 65°, dip 67°, rake 85°

How well it is located

Reviewed by a seismologist.

Depth from: OPERATOR_ASSIGNED

Nearby

Within 100 km, magnitude 3.7 and up: 36 in the 60 days after this one and 5 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 usp0007zea (also filed as choy19970326020857, gcmtc032697a, gcmt19970326020857, duputel032697a, ak9973wlx7cd, iscgem1018263). Read Thu, Oct 1, 2026, 12:05 PM UTC.