M6.3 earthquake 3 km ENE of Imaichi, Japan
A magnitude 6.3 earthquake struck 3 km ENE of Imaichi, Japan on Mon, Dec 26, 1949, 8:17 AM JST (23:17 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M6.3 2 km ESE of Imaichi, Japan. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 6.3 (mw), strong
- Local time
- UTC
- 1949-12-25 23:17:31 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 36.731° N, 139.722° E
- Region
- Japan
- Strongest shaking
- VII, very strong shaking
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Shaking
The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.
- Strongest estimated
- VII, very strong shaking
- Peak ground acceleration
- 31.2% of gravity
- Peak ground velocity
- 3.4 cm/s
- Map
- Automatic
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Magnitude uncertainty
- ±0.22
- Depth from
- From location
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 3.3 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 iscgem897116. Read Sat, Sep 26, 2026, 12:25 PM UTC.