M5.5 earthquake 12 km S of Ōtsuki, Japan
A magnitude 5.5 earthquake struck 12 km S of Ōtsuki, Japan on Fri, Jul 23, 1971, 7:07 AM JST (22:07 UTC), 22 km (14 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.5 (mw), moderate
- Local time
- UTC
- 1971-07-22 22:07:20 UTC
- Depth
- 22.1 km (13.7 mi), shallow
- Epicenter
- 35.504° N, 138.992° E
- Region
- Japan
- Strongest shaking
- VI, strong 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
- VI, strong shaking
- Peak ground acceleration
- 12.6% of gravity
- Peak ground velocity
- 1.8 cm/s
- Map
- Automatic
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Magnitude uncertainty
- ±0.20
- Depth from
- From location
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 iscgem782574. Read Tue, Sep 22, 2026, 6:05 AM UTC.