M4.7 earthquake 100 km ESE of Adak, Alaska
A magnitude 4.7 earthquake struck 100 km ESE of Adak, Alaska on Mon, Jan 12, 1987, 9:04 AM HAST (19:04 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.2 69 km SSW of Atka, 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
- 1987-01-12 19:04:30 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.378° N, 175.413° 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: 8 in the 60 days after this one and 5 in the 30 days before it.
After
- 4.681 km SSE of Adak, Alaska · 14501 days ago · 33 km deep · 48 km away
- 5.269 km SSW of Atka, Alaska · 14496 days ago · 33 km deep · 73 km away
- 4.781 km WSW of Atka, Alaska · 14467 days ago · 33 km deep · 49 km away
- 5.144 km SSW of Adak, Alaska · 14462 days ago · 33 km deep · 95 km away
- 5.094 km SSW of Atka, Alaska · 14462 days ago · 33 km deep · 42 km away
- 4.5106 km ESE of Adak, Alaska · 14460 days ago · 33 km deep · 15 km away
- 4.880 km S of Atka, Alaska · 14451 days ago · 33 km deep · 88 km away
- 5.091 km SW of Atka, Alaska · 14448 days ago · 33 km deep · 34 km away
Before
- 5.065 km ESE of Adak, Alaska · 14505 days ago · 33 km deep · 36 km away
- 3.950 km WSW of Atka, Alaska · 14511 days ago · 33 km deep · 83 km away
- 4.687 km SE of Adak, Alaska · 14518 days ago · 33 km deep · 33 km away
- 4.895 km SSW of Atka, Alaska · 14530 days ago · 33 km deep · 64 km away
- 5.290 km ESE of Adak, Alaska · 14532 days ago · 33 km deep · 28 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00031mc. Read Tue, Sep 29, 2026, 6:32 AM UTC.