M4.1 earthquake 30 km ESE of It?, Japan
A magnitude 4.1 earthquake struck 30 km ESE of It?, Japan on Sun, May 10, 1987, 5:58 PM JST (08:58 UTC), 23 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
- 4.1 (mb), light
- Local time
- UTC
- 1987-05-10 08:58:05 UTC
- Depth
- 22.7 km (14.1 mi), shallow
- Epicenter
- 34.849° N, 139.379° 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.
- Depth from
- FROM_LOCATION
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.627 km ESE of It?, Japan · 14387 days ago · 27 km deep · 2 km away
- 4.625 km ESE of It?, Japan · 14387 days ago · 31 km deep · 5 km away
- 4.130 km SW of Tateyama, Japan · 14340 days ago · 128 km deep · 21 km away
Before
Earthquakes todayJapan earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00034vw. Read Tue, Sep 29, 2026, 10:45 PM UTC.