M3.8 earthquake 30 km S of Hakodate, Japan
A magnitude 3.8 earthquake struck 30 km S of Hakodate, Japan on Fri, Sep 4, 1981, 4:38 PM JST (07:38 UTC), 157 km (97 mi) below the surface.
A larger quake followed: M4.7 35 km ENE of Mutsu, Japan. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.8 (mb, body-wave), minor
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1981-09-04 07:38:53 UTC
- Depth
- 156.9 km (97.5 mi), intermediate-depth
- Epicenter
- 41.507° N, 140.698° 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: 1 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 usp0001fnz. Read Sat, Oct 3, 2026, 9:50 PM UTC.