M3.9 earthquake 46 km N of Yonakuni, Japan
A magnitude 3.9 earthquake struck 46 km N of Yonakuni, Japan on Tue, Mar 31, 1981, 9:35 PM GMT+8 (13:35 UTC), 32 km (20 mi) below the surface.
A larger quake followed: M5.2 76 km NE of Yonakuni, Japan. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.9 (mb, body-wave), minor
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1981-03-31 13:35:00 UTC
- Depth
- 32.2 km (20.0 mi), shallow
- Epicenter
- 24.883° N, 122.954° E
- Region
- Japan
- 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
- FROM_LOCATION
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 4 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayJapan earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0001cyu. Read Sun, Oct 4, 2026, 7:58 AM UTC.