M4.1 earthquake 45 km W of Ninilchik, Alaska
A magnitude 4.1 earthquake struck 45 km W of Ninilchik, Alaska on Wed, Jul 20, 1977, 9:05 AM GMT-9 (18:05 UTC), 107 km (66 mi) below the surface.
A larger quake followed: M4.3 49 km ENE of Pedro Bay, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.1 (mb), light
- Local time
- UTC
- 1977-07-20 18:05:53 UTC
- Depth
- 107.0 km (66.5 mi), intermediate-depth
- Epicenter
- 60.126° N, 152.473° 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 1.5 and up: 5 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.349 km ENE of Pedro Bay, Alaska · 17960 days ago · 141 km deep · 49 km away
- 4.021 km NW of Anchor Point, Alaska · 17945 days ago · 52 km deep · 31 km away
- 4.369 km E of Port Alsworth, Alaska · 17942 days ago · 134 km deep · 36 km away
- 3.963 km ENE of Pedro Bay, Alaska · 17929 days ago · 144 km deep · 36 km away
- 3.540 km WNW of Clam Gulch, Alaska · 17901 days ago · 100 km deep · 35 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000pta. Read Tue, Sep 22, 2026, 10:49 AM UTC.