M3.8 earthquake 214 km SSE of Adak, Alaska
A magnitude 3.8 earthquake struck 214 km SSE of Adak, Alaska on Wed, Apr 15, 2020, 11:32 AM HADT (20:32 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M4.5 146 km SSE 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
- 3.8 (mb), minor
- Local time
- UTC
- 2020-04-15 20:32:56 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 50.186° N, 175.144° 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 9.7 km horizontally, 2.0 km in depth
- Magnitude uncertainty
- ±0.12
- Depth from
- Operator assigned
- Station coverage gap
- 208°, poorly surrounded by stations
- Stations used
- 18
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 2 in the 30 days before it.
After
- 1.9144 km S of Adak, Alaska · 2357 days ago · 23 km deep · 90 km away
- 1.8152 km SE of Adak, Alaska · 2337 days ago · 12 km deep · 83 km away
- 4.5146 km SSE of Adak, Alaska · 2330 days ago · 21 km deep · 73 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us70008x35. Read Wed, Sep 30, 2026, 11:12 PM UTC.