M5.5 earthquake 50 km SW of Yonakuni, Japan
A magnitude 5.5 earthquake struck 50 km SW of Yonakuni, Japan on Thu, Jun 30, 1966, 6:51 AM GMT+8 (22:51 UTC), 45 km (28 mi) below the surface.
A larger quake followed: M6.4 66 km WNW 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
- 5.5 (mw), moderate
- Local time
- UTC
- 1966-06-29 22:51:25 UTC
- Depth
- 45.2 km (28.1 mi), shallow
- Epicenter
- 24.200° N, 122.593° 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
- ±0.20
- 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: 3 in the 60 days after this one and 1 in the 30 days before it.
After
- 5.565 km ENE of Hualien City, Taiwan · 21999 days ago · 56 km deep · 45 km away
- 6.466 km WNW of Yonakuni, Japan · 21998 days ago · 113 km deep · 63 km away
- 5.666 km SSE of Yonakuni, Japan · 21945 days ago · 20 km deep · 73 km away
Before
Earthquakes todayJapan earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem847003. Read Tue, Sep 22, 2026, 7:08 AM UTC.