M7.0 earthquake 90 km SSE of Honchō, Japan
A magnitude 7.0 earthquake struck 90 km SSE of Honchō, Japan on Mon, Aug 2, 1971, 4:24 PM JST (07:24 UTC), 50 km (31 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 7.0 (mw), major
- Local time
- UTC
- 1971-08-02 07:24:58 UTC
- Depth
- 50.0 km (31.1 mi), shallow
- Epicenter
- 41.413° N, 143.432° 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
- 12.3% of gravity
- Peak ground velocity
- 2.4 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
- ±0.52
- 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: 3 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 iscgem780829 (also filed as atlas19710802072458). Read Tue, Sep 22, 2026, 10:26 PM UTC.