Alaska earthquakes

M5.6 earthquake 25 km SW of Cordova, Alaska

A magnitude 5.6 earthquake struck 25 km SW of Cordova, Alaska on Wed, Apr 8, 1964, 9:50 AM GMT-10 (19:50 UTC), 14 km (9 mi) below the surface.

A larger quake followed: M5.6 77 km SSE of Cordova, Alaska. This one was a foreshock.

Cordova forecastMore in Alaska

Map

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

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The earthquake

Magnitude
5.6 (mw), moderate
Local time
UTC
1964-04-08 19:50:19 UTC
Depth
14.3 km (8.9 mi), shallow
Epicenter
60.359° N, 146.037° W
Region
Alaska
Strongest shaking
V, moderate 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
V, moderate shaking
Peak ground acceleration
12.0% of gravity
Peak ground velocity
1.9 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
±0.24
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: 5 in the 60 days after this one and 14 in the 30 days before it.

After

  1. 5.677 km SSE of Cordova, Alaska · 22811 days ago · 17 km deep · 68 km away
  2. 5.536 km NE of Cordova, Alaska · 22800 days ago · 24 km deep · 62 km away
  3. 5.541 km SW of Cordova, Alaska · 22789 days ago · 25 km deep · 16 km away
  4. 5.676 km SW of Cordova, Alaska · 22761 days ago · 10 km deep · 50 km away
  5. 5.529 km SSW of Cordova, Alaska · 22754 days ago · 13 km deep · 6 km away

Before

  1. 5.866 km E of Chenega, Alaska · 22815 days ago · 15 km deep · 48 km away
  2. 6.067 km E of Chenega, Alaska · 22816 days ago · 25 km deep · 61 km away
  3. 5.658 km WSW of Cordova, Alaska · 22816 days ago · 15 km deep · 35 km away
  4. 6.078 km S of Cordova, Alaska · 22821 days ago · 11 km deep · 59 km away
  5. 5.558 km ESE of Chenega, Alaska · 22822 days ago · 15 km deep · 84 km away
  6. 5.775 km SE of Chenega, Alaska · 22822 days ago · 18 km deep · 96 km away
  7. 6.356 km WSW of Cordova, Alaska · 22823 days ago · 10 km deep · 36 km away
  8. 6.360 km SW of Cordova, Alaska · 22823 days ago · 10 km deep · 37 km away
  9. 5.749 km WSW of Cordova, Alaska · 22823 days ago · 25 km deep · 27 km away
  10. 5.375 km E of Cordova, Alaska · 22823 days ago · 15 km deep · 96 km away
  11. 6.1101 km SE of Chenega, Alaska · 22823 days ago · 15 km deep · 92 km away
  12. 5.7Southern Alaska · 22823 days ago · 15 km deep · 99 km away
  13. 5.765 km SSW of Cordova, Alaska · 22823 days ago · 15 km deep · 39 km away
  14. 9.2The 1964 Prince William Sound, Alaska Earthquake · 22823 days ago · 25 km deep · 94 km away · felt by 459

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event iscgem868530. Read Tue, Sep 22, 2026, 8:51 AM UTC.