M4.6 earthquake 105 km SSE of Old Harbor, Alaska
A magnitude 4.6 earthquake struck 105 km SSE of Old Harbor, Alaska on Tue, Apr 11, 1978, 6:47 PM GMT-10 (04:47 UTC), 15 km (9 mi) below the surface.
A larger quake followed: M5.1 93 km SSE of Old Harbor, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.6 (mb), light
- Local time
- UTC
- 1978-04-12 04:47:16 UTC
- Depth
- 15.0 km (9.3 mi), shallow
- Epicenter
- 56.352° N, 152.559° 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
- 28
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.6 and up: 11 in the 60 days after this one and 4 in the 30 days before it.
After
- 5.193 km SSE of Old Harbor, Alaska · 17695 days ago · 24 km deep · 12 km away
- 4.6103 km SSE of Old Harbor, Alaska · 17695 days ago · 19 km deep · 3 km away
- 5.175 km SSE of Old Harbor, Alaska · 17695 days ago · 27 km deep · 30 km away
- 3.5172 km SSE of Old Harbor, Alaska · 17695 days ago · 33 km deep · 68 km away
- 4.5134 km SSE of Old Harbor, Alaska · 17694 days ago · 33 km deep · 31 km away
- 4.397 km SSE of Old Harbor, Alaska · 17693 days ago · 33 km deep · 19 km away
- 4.968 km SSE of Old Harbor, Alaska · 17691 days ago · 24 km deep · 37 km away
- 4.596 km SSE of Old Harbor, Alaska · 17689 days ago · 33 km deep · 18 km away
- 4.7Kodiak Island region, Alaska · 17685 days ago · 33 km deep · 22 km away
- 4.778 km SSE of Old Harbor, Alaska · 17680 days ago · 33 km deep · 27 km away
- 4.7104 km SSE of Old Harbor, Alaska · 17656 days ago · 33 km deep · 1 km away
Before
- 4.776 km SSE of Old Harbor, Alaska · 17695 days ago · 16 km deep · 31 km away
- 4.791 km SSE of Old Harbor, Alaska · 17695 days ago · 33 km deep · 16 km away
- 5.239 km SE of Akhiok, Alaska · 17695 days ago · 23 km deep · 79 km away
- 6.694 km SSE of Old Harbor, Alaska · 17695 days ago · 14 km deep · 11 km away
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000u22. Read Tue, Sep 22, 2026, 9:10 AM UTC.