M4.7 earthquake 102 km S of Koshima, Japan
A magnitude 4.7 earthquake struck 102 km S of Koshima, Japan on Thu, Nov 9, 1978, 8:46 PM JST (11:46 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.9 128 km SE of Koshima, 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
- 1978-11-09 11:46:34 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 29.308° N, 130.537° 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
- Stations used
- 12
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.7 and up: 1 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayJapan earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000xc5. Read Tue, Sep 22, 2026, 9:38 AM UTC.