M6.6 earthquake 18 km WNW of Tenn?, Japan
A magnitude 6.6 earthquake struck 18 km WNW of Tenn?, Japan on Tue, May 2, 1939, 1:05 AM JST (16:05 UTC), 10 km (6 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 6.6 (mw), strong
- Local time
- UTC
- 1939-05-01 16:05:51 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 39.978° N, 139.771° 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
- 32.4% of gravity
- Peak ground velocity
- 3.7 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
- ±0.21
- Depth from
- From location
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 2 in the 30 days before it.
Before
Earthquakes todayJapan earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem901923. Read Tue, Sep 22, 2026, 8:05 AM UTC.