M4.2 earthquake Alaska Peninsula
A magnitude 4.2 earthquake struck in the Alaska Peninsula on Sat, Aug 22, 1987, 3:18 AM AKDT (11:18 UTC), 150 km (93 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.2 (mb), light
- Local time
- UTC
- 1987-08-22 11:18:45 UTC
- Depth
- 150.0 km (93.2 mi), intermediate-depth
- Epicenter
- 56.362° N, 161.538° 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
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 0 in the 60 days after this one and 0 in the 30 days before it.
None recorded.
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00037qq. Read Tue, Sep 22, 2026, 7:31 AM UTC.