M5.5 earthquake 65 km E of Onagawa Chō, Japan
A magnitude 5.5 earthquake struck 65 km E of Onagawa Chō, Japan on Fri, Mar 26, 1971, 1:19 AM JST (16:19 UTC), 42 km (26 mi) below the surface.
A larger quake followed: M6.1 68 km E of Onagawa Chō, Japan. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.5 (mw), moderate
- Local time
- UTC
- 1971-03-25 16:19:52 UTC
- Depth
- 42.2 km (26.2 mi), shallow
- Epicenter
- 38.475° N, 142.196° 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.
- 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 2.5 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 iscgem786621. Read Wed, Sep 30, 2026, 11:42 PM UTC.