M4.3 earthquake 109 km S of Koshima, Japan
A magnitude 4.3 earthquake struck 109 km S of Koshima, Japan on Thu, Jul 16, 1987, 7:03 AM JST (22:03 UTC), 39 km (24 mi) below the surface.
A larger quake followed: M5.0 94 km S of Yudomari, 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
- 1987-07-15 22:03:41 UTC
- Depth
- 39.3 km (24.4 mi), shallow
- Epicenter
- 29.250° N, 130.675° 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 3 in the 30 days before it.
After
- 5.094 km S of Yudomari, Japan · 14314 days ago · 49 km deep · 26 km away
- 4.5101 km S of Koshima, Japan · 14310 days ago · 33 km deep · 8 km away
- 3.9141 km SSE of Koshima, Japan · 14310 days ago · 33 km deep · 44 km away
Before
Earthquakes todayJapan earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00036p7. Read Tue, Sep 22, 2026, 8:47 PM UTC.