M4.8 earthquake 140 km WSW of Adak, Alaska
A magnitude 4.8 earthquake struck 140 km WSW of Adak, Alaska on Fri, Feb 28, 1997, 8:45 PM HAST (06:45 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.5 115 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
- 4.8 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1997-03-01 06:45:14 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.448° N, 178.542° 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.
- Depth from
- OPERATOR_ASSIGNED
Nearby
Within 100 km, magnitude 1.8 and up: 6 in the 60 days after this one and 3 in the 30 days before it.
After
- 4.8107 km WSW of Adak, Alaska · 10798 days ago · 56 km deep · 35 km away
- 4.242 km W of Adak, Alaska · 10798 days ago · 64 km deep · 98 km away
- 4.2194 km WSW of Adak, Alaska · 10786 days ago · 33 km deep · 56 km away
- 4.1163 km WSW of Adak, Alaska · 10782 days ago · 33 km deep · 35 km away
- 4.8112 km WSW of Adak, Alaska · 10782 days ago · 33 km deep · 37 km away
- 5.5115 km WSW of Adak, Alaska · 10777 days ago · 33 km deep · 33 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0007y25. Read Thu, Oct 1, 2026, 11:24 AM UTC.