M3.9 earthquake 18 km SE of It?, Japan
A magnitude 3.9 earthquake struck 18 km SE of It?, Japan on Sun, May 10, 1987, 10:38 AM JST (01:38 UTC), 22 km (14 mi) below the surface.
A larger quake followed: M4.6 27 km ESE of It?, Japan. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.9 (mb), minor
- Local time
- UTC
- 1987-05-10 01:38:41 UTC
- Depth
- 22.4 km (13.9 mi), shallow
- Epicenter
- 34.837° N, 139.210° 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.
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 0 in the 30 days before it.
After
- 4.119 km SE of It?, Japan · 14387 days ago · 27 km deep · 6 km away
- 4.130 km ESE of It?, Japan · 14387 days ago · 23 km deep · 15 km away
- 4.627 km ESE of It?, Japan · 14387 days ago · 27 km deep · 13 km away
- 4.625 km ESE of It?, Japan · 14386 days ago · 31 km deep · 11 km away
- 4.130 km SW of Tateyama, Japan · 14339 days ago · 128 km deep · 37 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00034vj. Read Tue, Sep 29, 2026, 9:06 AM UTC.