Alaska earthquakes

M6.5 earthquake 15 km S of Rampart, Alaska

A magnitude 6.5 earthquake struck 15 km S of Rampart, Alaska on Tue, Oct 29, 1968, 12:16 PM GMT-10 (22:16 UTC), 10 km (6 mi) below the surface.

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Map

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

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The earthquake

Magnitude
6.5 (Mw, moment), strong
Magnitude from
ISC-GEM global catalog
Local time
UTC
1968-10-29 22:16:18 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
65.367° N, 150.132° W
Region
Alaska
Strongest shaking
VIII, severe shaking
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.ScaleComputed byNotes
6.45Mw, momentISC-GEM global catalogPreferred · Final · ±0.57
6.5Ms, surface-waveUSGS historic United States catalogFinal

What happened

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

Maximum observed Modified Mercalli Intensity (MMI) VII

From the USGS event page for iscgem816416. U.S. Geological Survey text and figures are in the public domain.

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated
VIII, severe shaking
Peak ground acceleration
32.4% of gravity
Peak ground velocity
3.6 cm/s
Map
Automatic
USGS ShakeMap: estimated shaking intensity around the epicenter
Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Magnitude uncertainty
±0.57
Depth from
From location

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 3.5 and up: 0 in the 60 days after this one and 0 in the 30 days before it.

None recorded.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event iscgem816416 (also filed as ushis3023). Read Sun, Oct 4, 2026, 6:25 PM UTC.