M4.2 earthquake 132 km SSW of ?yama, Japan
A magnitude 4.2 earthquake struck 132 km SSW of ?yama, Japan on Thu, Sep 12, 1985, 4:18 PM JST (07:18 UTC), 314 km (195 mi) below the surface.
A larger quake followed: M4.5 129 km SSE of ?yama, Japan. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.2 (mb), light
- Local time
- UTC
- 1985-09-12 07:18:34 UTC
- Depth
- 313.9 km (195.0 mi), deep
- Epicenter
- 33.492° N, 137.697° 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.
- Depth from
- FROM_LOCATION
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.5129 km SSE of ?yama, Japan · 14949 days ago · 355 km deep · 88 km away
- 4.4171 km S of ?yama, Japan · 14945 days ago · 341 km deep · 47 km away
Before
Earthquakes todayJapan earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002jpt. Read Wed, Sep 30, 2026, 11:04 AM UTC.