M5.6 earthquake 100 km SSE of Honchō, Japan
A magnitude 5.6 earthquake struck 100 km SSE of Honchō, Japan on Mon, Aug 2, 1971, 10:00 PM JST (13:00 UTC), 50 km (31 mi) below the surface.
A larger quake followed: M5.8 174 km SSE of Hiroo, Japan. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.6 (mw), moderate
- Local time
- UTC
- 1971-08-02 13:00:02 UTC
- Depth
- 50.0 km (31.1 mi), shallow
- Epicenter
- 41.350° N, 143.541° 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.
- 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: 2 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.8174 km SSE of Hiroo, Japan · 20126 days ago · 26 km deep · 74 km away
- 5.1146 km SSE of Honchō, Japan · 20116 days ago · 39 km deep · 46 km away
Before
Earthquakes todayJapan earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem780843. Read Tue, Sep 22, 2026, 3:33 PM UTC.