M2.5 earthquake 241 km WNW of Adak, Alaska
A magnitude 2.5 earthquake struck 241 km WNW of Adak, Alaska on Fri, May 28, 2021, 4:15 PM HADT (01:15 UTC), 92 km (57 mi) below the surface.
A larger quake followed: M3.8 170 km WNW 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
- 2.5 (ml), micro
- Local time
- UTC
- 2021-05-29 01:15:34 UTC
- Depth
- 92.1 km (57.2 mi), intermediate-depth
- Epicenter
- 52.680° N, 179.920° 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 14.5 km horizontally, 32.3 km in depth
- Magnitude uncertainty
- ±0.15
- Depth from
- From location
- Station coverage gap
- 255°, poorly surrounded by stations
- Stations used
- 23
Nearby
Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 1 in the 30 days before it.
After
- 3.8170 km WNW of Adak, Alaska · 1936 days ago · 206 km deep · 71 km away
- 2.2256 km W of Adak, Alaska · 1904 days ago · 141 km deep · 94 km away
- 1.5213 km W of Adak, Alaska · 1899 days ago · 110 km deep · 99 km away
- 2.7147 km WNW of Adak, Alaska · 1896 days ago · 238 km deep · 93 km away
- 2.0269 km W of Adak, Alaska · 1892 days ago · 147 km deep · 89 km away
- 1.9281 km W of Adak, Alaska · 1891 days ago · 154 km deep · 88 km away
- 2.1244 km W of Adak, Alaska · 1889 days ago · 135 km deep · 87 km away
- 2.2256 km W of Adak, Alaska · 1888 days ago · 130 km deep · 92 km away
- 2.9211 km W of Adak, Alaska · 1888 days ago · 158 km deep · 82 km away
- 2.8266 km W of Adak, Alaska · 1887 days ago · 195 km deep · 81 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us7000edy3 (also filed as ak0216ufrfkm). Read Fri, Sep 25, 2026, 9:48 PM UTC.