M4.5 earthquake 109 km S of Koshima, Japan
A magnitude 4.5 earthquake struck 109 km S of Koshima, Japan on Tue, Oct 29, 1985, 1:45 AM JST (16:45 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.9 79 km ENE of Naze, Japan. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.5 (mb), light
- Local time
- UTC
- 1985-10-28 16:45:54 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 29.250° N, 130.616° 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: 5 in the 60 days after this one and 0 in the 30 days before it.
After
- 4.7113 km S of Koshima, Japan · 14946 days ago · 33 km deep · 5 km away
- 4.7100 km NE of Naze, Japan · 14940 days ago · 52 km deep · 47 km away
- 4.8114 km NE of Naze, Japan · 14929 days ago · 59 km deep · 35 km away
- 4.163 km ENE of Naze, Japan · 14915 days ago · 70 km deep · 89 km away
- 4.979 km ENE of Naze, Japan · 14913 days ago · 51 km deep · 76 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002m7r. Read Wed, Sep 30, 2026, 1:43 AM UTC.