M4.7 earthquake 42 km ESE of Koseda, Japan
A magnitude 4.7 earthquake struck 42 km ESE of Koseda, Japan on Thu, Jul 30, 1987, 10:27 PM JST (13:27 UTC), 56 km (35 mi) below the surface.
A larger quake followed: M5.1 62 km ENE of Nishinoomote, Japan. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.7 (mb), light
- Local time
- UTC
- 1987-07-30 13:27:51 UTC
- Depth
- 55.8 km (34.7 mi), shallow
- Epicenter
- 30.226° N, 131.048° 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 1.7 and up: 3 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.162 km ENE of Nishinoomote, Japan · 14264 days ago · 51 km deep · 92 km away
- 4.578 km ESE of Nishinoomote, Japan · 14259 days ago · 33 km deep · 82 km away
- 4.352 km SSE of Nishinoomote, Japan · 14244 days ago · 65 km deep · 25 km away
Before
Earthquakes todayJapan earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp000372g. Read Tue, Sep 22, 2026, 8:46 PM UTC.