M4.0 earthquake 67 km NW of Yonakuni, Japan
A magnitude 4.0 earthquake struck 67 km NW of Yonakuni, Japan on Sun, Dec 24, 1978, 1:23 PM GMT+8 (05:23 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.9 24 km SE of Yonakuni, Japan. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.0 (mb), light
- Local time
- UTC
- 1978-12-24 05:23:47 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 24.850° N, 122.476° 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
- 8
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 1 in the 60 days after this one and 1 in the 30 days before it.
After
Before
Earthquakes todayJapan earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000y2v. Read Tue, Sep 22, 2026, 8:45 PM UTC.