M4.6 earthquake 145 km WSW of Adak, Alaska
A magnitude 4.6 earthquake struck 145 km WSW of Adak, Alaska on Sat, Jul 4, 1987, 8:39 PM HADT (05:39 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.8 173 km WSW of Adak, AK. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.6 (mb), light
- Local time
- UTC
- 1987-07-05 05:39:31 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.249° N, 178.484° 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 1.6 and up: 4 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.8173 km WSW of Adak, AK · 14300 days ago · 33 km deep · 29 km away
- 4.6161 km WSW of Adak, Alaska · 14297 days ago · 33 km deep · 18 km away
- 4.8154 km WSW of Adak, Alaska · 14297 days ago · 33 km deep · 13 km away
- 5.0177 km WSW of Adak, Alaska · 14285 days ago · 33 km deep · 34 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00036bn. Read Tue, Sep 22, 2026, 9:39 AM UTC.