M6.0 earthquake 118 km WSW of Iwanai, Japan
A magnitude 6.0 earthquake struck 118 km WSW of Iwanai, Japan on Sat, May 9, 1981, 8:34 AM JST (23:34 UTC), 200 km (125 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 6.0 (mb), strong
- Local time
- UTC
- 1981-05-08 23:34:44 UTC
- Depth
- 200.4 km (124.5 mi), intermediate-depth
- Epicenter
- 42.660° N, 139.129° E
- Region
- Japan
- Strongest shaking
- IV, light shaking
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Shaking
The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.
- Strongest estimated
- IV, light shaking
- Peak ground acceleration
- 1.1% of gravity
- Peak ground velocity
- -0.4 cm/s
- Map
- Automatic
Did you feel it?
No one has reported feeling this quake to the USGS.
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.5 and up: 0 in the 60 days after this one and 0 in the 30 days before it.
None recorded.
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0001dke (also filed as gcmtb050881a, gcmt19810508233444, iscgem626381). Read Tue, Sep 22, 2026, 10:17 AM UTC.