M3.1 earthquake 128 km WNW of Nikolski, Alaska
A magnitude 3.1 earthquake struck 128 km WNW of Nikolski, Alaska on Wed, Aug 11, 2021, 8:16 AM HADT (17:16 UTC), 180 km (112 mi) below the surface.
A larger quake followed: M3.4 126 km W 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
- 3.1 (ml), minor
- Local time
- UTC
- 2021-08-11 17:16:31 UTC
- Depth
- 179.7 km (111.7 mi), intermediate-depth
- Epicenter
- 53.328° N, 170.676° 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.
- Location uncertainty
- About 11.4 km horizontally, 19.1 km in depth
- Magnitude uncertainty
- ±0.10
- Depth from
- From location
- Station coverage gap
- 144°
- Stations used
- 30
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 3 in the 30 days before it.
After
- 2.093 km WSW of Nikolski, Alaska · 1868 days ago · 3 km deep · 86 km away
- 1.996 km WSW of Nikolski, Alaska · 1868 days ago · 5 km deep · 100 km away
- 2.294 km WSW of Nikolski, Alaska · 1862 days ago · 2 km deep · 79 km away
- 2.097 km WSW of Nikolski, Alaska · 1862 days ago · 5 km deep · 80 km away
- 2.957 km W of Nikolski, Alaska · 1854 days ago · 11 km deep · 76 km away
- 2.6139 km WSW of Nikolski, Alaska · 1842 days ago · 88 km deep · 77 km away
- 3.4126 km W of Nikolski, Alaska · 1840 days ago · 217 km deep · 33 km away
- 3.2104 km WNW of Nikolski, Alaska · 1829 days ago · 204 km deep · 38 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000f8l7 (also filed as ak021a9329a2). Read Thu, Sep 24, 2026, 11:37 AM UTC.