M4.0 earthquake 140 km W of Adak, Alaska
A magnitude 4.0 earthquake struck 140 km W of Adak, Alaska on Tue, Apr 7, 1998, 10:47 AM HADT (19:47 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.6 52 km SW 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
- 1998-04-07 19:47:35 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.691° N, 178.646° 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: 5 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.652 km SW of Adak, Alaska · 10394 days ago · 43 km deep · 99 km away
- 3.299 km SW of Adak, Alaska · 10385 days ago · 61 km deep · 81 km away
- 4.2119 km WSW of Adak, Alaska · 10373 days ago · 33 km deep · 49 km away
- 4.3122 km SW of Adak, Alaska · 10367 days ago · 33 km deep · 71 km away
- 3.7111 km SW of Adak, Alaska · 10348 days ago · 33 km deep · 68 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0008jq8. Read Sat, Oct 3, 2026, 4:08 AM UTC.