M4.3 earthquake 18 km NNE of Nikk?, Japan
A magnitude 4.3 earthquake struck 18 km NNE of Nikk?, Japan on Fri, Apr 24, 1987, 10:19 PM JST (13:19 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.7 21 km ESE of Suibara, Japan. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.3 (mb), light
- Local time
- UTC
- 1987-04-24 13:19:31 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 36.892° N, 139.725° 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
- OPERATOR_ASSIGNED
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 1 in the 30 days before it.
After
- 4.721 km ESE of Suibara, Japan · 14365 days ago · 37 km deep · 100 km away
- 4.16 km SSW of Tsukuba, Japan · 14348 days ago · 66 km deep · 88 km away
- 4.87 km SW of Inawashiro, Japan · 14343 days ago · 37 km deep · 75 km away
Before
Earthquakes todayJapan earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00034eg. Read Tue, Sep 22, 2026, 12:17 PM UTC.