M4.0 earthquake 235 km WSW of Adak, Alaska
A magnitude 4.0 earthquake struck 235 km WSW of Adak, Alaska on Thu, Aug 27, 1998, 11:44 PM HADT (08:44 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.9 182 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
- 4.0 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1998-08-28 08:44:52 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.258° N, 179.879° 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 1.5 and up: 9 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.4Rat Islands, Aleutian Islands, Alaska · 10249 days ago · 33 km deep · 98 km away
- 4.3Rat Islands, Aleutian Islands, Alaska · 10249 days ago · 33 km deep · 95 km away
- 4.3178 km WSW of Adak, Alaska · 10245 days ago · 33 km deep · 57 km away
- 4.9182 km WSW of Adak, Alaska · 10245 days ago · 33 km deep · 55 km away
- 4.6154 km W of Adak, Alaska · 10239 days ago · 33 km deep · 92 km away
- 4.1146 km WSW of Adak, Alaska · 10228 days ago · 33 km deep · 91 km away
- 4.7142 km WSW of Adak, Alaska · 10225 days ago · 52 km deep · 93 km away
- 4.4Rat Islands, Aleutian Islands, Alaska · 10222 days ago · 33 km deep · 89 km away
- 4.7Rat Islands, Aleutian Islands, Alaska · 10222 days ago · 33 km deep · 94 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0008tzz. Read Fri, Oct 2, 2026, 7:38 AM UTC.