M5.5 earthquake 51 km SSE of Chignik, Alaska
A magnitude 5.5 earthquake struck 51 km SSE of Chignik, Alaska on Wed, Feb 23, 1972, 3:43 PM GMT-10 (01:43 UTC), 59 km (37 mi) below the surface.
A larger quake followed: M6.4 77 km ESE of Chignik, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.5 (mw), moderate
- Local time
- UTC
- 1972-02-24 01:43:05 UTC
- Depth
- 58.9 km (36.6 mi), shallow
- Epicenter
- 55.846° N, 158.214° W
- Region
- Alaska
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
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: 1 in the 60 days after this one and 1 in the 30 days before it.
After
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem776426. Read Tue, Sep 22, 2026, 8:56 PM UTC.