M4.5 earthquake 23 km W of Adak, Alaska
A magnitude 4.5 earthquake struck 23 km W of Adak, Alaska on Wed, Oct 21, 1998, 3:39 AM HADT (12:39 UTC), 60 km (37 mi) below the surface.
A larger quake followed: M5.3 70 km SSE 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
- 4.5 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1998-10-21 12:39:34 UTC
- Depth
- 60.2 km (37.4 mi), shallow
- Epicenter
- 51.850° N, 176.974° 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.
Nearby
Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 4 in the 30 days before it.
After
- 5.370 km SSE of Adak, Alaska · 10196 days ago · 33 km deep · 81 km away
- 4.673 km SSE of Adak, Alaska · 10196 days ago · 33 km deep · 85 km away
- 4.077 km SSE of Adak, Alaska · 10195 days ago · 33 km deep · 90 km away
- 5.241 km NE of Adak, Alaska · 10194 days ago · 35 km deep · 63 km away
- 4.324 km SW of Adak, Alaska · 10190 days ago · 58 km deep · 18 km away
- 4.7115 km SW of Adak, Alaska · 10172 days ago · 33 km deep · 95 km away
- 4.789 km N of Adak, Alaska · 10168 days ago · 196 km deep · 98 km away
- 3.9102 km W of Adak, Alaska · 10165 days ago · 66 km deep · 80 km away
Before
- 4.342 km S of Adak, Alaska · 10214 days ago · 67 km deep · 44 km away
- 4.731 km SW of Adak, Alaska · 10216 days ago · 58 km deep · 21 km away
- 4.6103 km WSW of Adak, Alaska · 10227 days ago · 33 km deep · 80 km away
- 5.4Andreanof Islands, Aleutian Islands, Alaska · 10228 days ago · 33 km deep · 92 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0008wut. Read Fri, Oct 2, 2026, 11:49 AM UTC.