M5.9 earthquake 99 km S of Koshima, Japan
A magnitude 5.9 earthquake struck 99 km S of Koshima, Japan on Thu, Feb 23, 1978, 3:00 AM JST (18:00 UTC), 60 km (37 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.9 (mb), moderate
- Local time
- UTC
- 1978-02-22 18:00:35 UTC
- Depth
- 60.0 km (37.3 mi), shallow
- Epicenter
- 29.340° N, 130.535° 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
- CONSTRAINED_BY_DEPTH_PHASES
- Stations used
- 317
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.5 and up: 0 in the 60 days after this one and 0 in the 30 days before it.
None recorded.
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000t3g (also filed as gcmtb022278b, gcmt19780222180035, iscgem686861). Read Tue, Sep 22, 2026, 9:17 AM UTC.