M4.0 earthquake 25 km WNW of Yonakuni, Japan
A magnitude 4.0 earthquake struck 25 km WNW of Yonakuni, Japan on Fri, Sep 25, 1981, 6:34 PM GMT+8 (10:34 UTC), 110 km (68 mi) below the surface.
A larger quake followed: M4.5 50 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
- 4.0 (mb), light
- Local time
- UTC
- 1981-09-25 10:34:46 UTC
- Depth
- 110.2 km (68.5 mi), intermediate-depth
- Epicenter
- 24.547° N, 122.761° 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 1.5 and up: 3 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.550 km WNW of Yonakuni, Japan · 16411 days ago · 107 km deep · 25 km away
- 4.257 km SW of Yonakuni, Japan · 16402 days ago · 10 km deep · 53 km away
- 3.837 km ENE of Hualien City, Taiwan · 16381 days ago · 10 km deep · 97 km away
Before
Earthquakes todayJapan earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0001g3a. Read Tue, Sep 22, 2026, 9:11 AM UTC.