M6.4 earthquake 25 km NW of Nanwalek, Alaska
A magnitude 6.4 earthquake struck 25 km NW of Nanwalek, Alaska on Sun, Jun 23, 1963, 6:26 PM GMT-10 (04:26 UTC), 45 km (28 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 6.4 (mw), strong
- Local time
- UTC
- 1963-06-24 04:26:40 UTC
- Depth
- 45.0 km (28.0 mi), shallow
- Epicenter
- 59.499° N, 152.280° W
- Region
- Alaska
- Strongest shaking
- VI, strong shaking
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
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
- 11.6% of gravity
- Peak ground velocity
- 2.0 cm/s
- Map
- Automatic
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
- ±0.30
- Depth from
- From location
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.5 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 iscgem872570 (also filed as ushis2613, atlas19630624042637). Read Tue, Sep 22, 2026, 6:32 AM UTC.