M5.5 earthquake 259 km W of Adak, Alaska
A magnitude 5.5 earthquake struck 259 km W of Adak, Alaska on Tue, Feb 9, 1965, 4:34 PM GMT+12 (04:34 UTC), 40 km (25 mi) below the surface.
A larger quake followed: M5.8 281 km WSW of Adak, 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 (mb, body-wave), moderate
- Magnitude from
- USGS historic United States catalog
- Local time
- UTC
- 1965-02-09 04:34:59 UTC
- Depth
- 40.0 km (24.9 mi), shallow
- Epicenter
- 52.270° N, 179.640° E
- Region
- Alaska
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
What happened
The USGS’s account of the effects of this earthquake.
Maximum observed Modified Mercalli Intensity (MMI) I
From the USGS event page for ushis2778. 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.
Nearby
Within 100 km, magnitude 2.5 and up: 1 in the 60 days after this one and 2 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 ushis2778. Read Thu, Oct 1, 2026, 11:32 AM UTC.