M5.1 earthquake 83 km SSW of Nikolski, Alaska
A magnitude 5.1 earthquake struck 83 km SSW of Nikolski, Alaska on Sun, Oct 18, 1987, 2:23 PM AKDT (22:23 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.2 139 km WSW of Nikolski, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.1 (mb, body-wave), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1987-10-18 22:23:50 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 52.281° N, 169.442° 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
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.1 and up: 5 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.775 km SSW of Nikolski, Alaska · 14229 days ago · 33 km deep · 8 km away
- 5.2139 km WSW of Nikolski, Alaska · 14220 days ago · 33 km deep · 88 km away
- 4.5137 km WSW of Nikolski, Alaska · 14187 days ago · 33 km deep · 87 km away
- 5.1171 km SW of Nikolski, Alaska · 14187 days ago · 33 km deep · 92 km away
- 4.6146 km SW of Nikolski, Alaska · 14186 days ago · 33 km deep · 78 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00039d2. Read Sat, Oct 3, 2026, 4:42 PM UTC.