M4.7 earthquake 84 km S of Adak, Alaska
A magnitude 4.7 earthquake struck 84 km S of Adak, Alaska on Tue, Jun 30, 1987, 10:08 AM HADT (19:08 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.0 97 km S 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
- 4.7 (mb), light
- Local time
- UTC
- 1987-06-30 19:08:13 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.124° N, 176.459° 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 1.7 and up: 3 in the 60 days after this one and 8 in the 30 days before it.
After
- 5.097 km S of Adak, Alaska · 14330 days ago · 33 km deep · 13 km away
- 4.583 km S of Adak, Alaska · 14330 days ago · 33 km deep · 5 km away
- 4.1110 km SSE of Adak, Alaska · 14308 days ago · 33 km deep · 38 km away
Before
- 4.588 km S of Adak, Alaska · 14330 days ago · 33 km deep · 5 km away
- 4.0100 km S of Adak, Alaska · 14330 days ago · 33 km deep · 16 km away
- 4.588 km S of Adak, Alaska · 14336 days ago · 33 km deep · 8 km away
- 4.986 km S of Adak, Alaska · 14337 days ago · 33 km deep · 8 km away
- 4.386 km SSE of Adak, Alaska · 14345 days ago · 33 km deep · 27 km away
- 5.036 km SE of Adak, Alaska · 14359 days ago · 58 km deep · 61 km away
- 4.982 km SW of Adak, Alaska · 14360 days ago · 33 km deep · 73 km away
- 5.570 km WSW of Adak, Alaska · 14360 days ago · 33 km deep · 86 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp000367g. Read Wed, Sep 23, 2026, 2:07 PM UTC.