M4.9 earthquake 65 km NE of Yonakuni, Japan
A magnitude 4.9 earthquake struck 65 km NE of Yonakuni, Japan on Fri, Aug 16, 1985, 8:22 AM JST (23:22 UTC), 118 km (73 mi) below the surface.
A larger quake followed: M5.1 14 km NW 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
- 4.9 (mb), light
- Local time
- UTC
- 1985-08-15 23:22:52 UTC
- Depth
- 118.2 km (73.4 mi), intermediate-depth
- Epicenter
- 24.847° N, 123.492° 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.
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.9 and up: 3 in the 60 days after this one and 1 in the 30 days before it.
After
- 3.820 km N of Yonakuni, Japan · 15002 days ago · 33 km deep · 56 km away
- 5.114 km NW of Yonakuni, Japan · 14993 days ago · 106 km deep · 69 km away
- 3.742 km W of Ishigaki, Japan · 14972 days ago · 33 km deep · 55 km away
Before
Earthquakes todayJapan earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002ht5. Read Mon, Sep 28, 2026, 10:41 AM UTC.