M3.9 earthquake 141 km SSE of Koshima, Japan
A magnitude 3.9 earthquake struck 141 km SSE of Koshima, Japan on Mon, Jul 20, 1987, 1:48 PM JST (04:48 UTC), 33 km (21 mi) below the surface.
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
- 1987-07-20 04:48:30 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 29.047° N, 131.059° 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: 0 in the 60 days after this one and 6 in the 30 days before it.
Before
- 4.5101 km S of Koshima, Japan · 14311 days ago · 33 km deep · 48 km away
- 5.094 km S of Yudomari, Japan · 14314 days ago · 49 km deep · 69 km away
- 4.3109 km S of Koshima, Japan · 14314 days ago · 39 km deep · 44 km away
- 4.7178 km SSE of Koshima, Japan · 14314 days ago · 33 km deep · 39 km away
- 5.7108 km S of Koshima, Japan · 14315 days ago · 51 km deep · 53 km away
- 5.1111 km S of Yudomari, Japan · 14333 days ago · 57 km deep · 58 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00036ss. Read Tue, Sep 22, 2026, 10:27 PM UTC.