M5.0 earthquake 30 km ESE of Adak, Alaska
A magnitude 5.0 earthquake struck 30 km ESE of Adak, Alaska on Tue, Jun 28, 1977, 10:47 PM GMT-10 (08:47 UTC), 60 km (37 mi) below the surface.
A larger quake followed: M5.3 56 km NNE 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
- 5.0 (mb), moderate
- Local time
- UTC
- 1977-06-29 08:47:15 UTC
- Depth
- 60.0 km (37.3 mi), shallow
- Epicenter
- 51.774° N, 176.216° 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.
- Stations used
- 115
Nearby
Within 100 km, magnitude 2.0 and up: 6 in the 60 days after this one and 0 in the 30 days before it.
After
- 4.4115 km SE of Adak, Alaska · 17948 days ago · 19 km deep · 87 km away
- 5.356 km NNE of Adak, Alaska · 17942 days ago · 125 km deep · 64 km away
- 4.536 km SSE of Adak, Alaska · 17935 days ago · 63 km deep · 23 km away
- 5.486 km WSW of Atka, Alaska · 17933 days ago · 57 km deep · 61 km away
- 4.278 km WSW of Atka, Alaska · 17932 days ago · 33 km deep · 72 km away
- 4.267 km WSW of Atka, Alaska · 17928 days ago · 33 km deep · 79 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000phu. Read Tue, Sep 22, 2026, 6:35 AM UTC.