M4.9 earthquake 33 km ENE of Gero, Japan
A magnitude 4.9 earthquake struck 33 km ENE of Gero, Japan on Fri, Sep 14, 1984, 8:57 AM JST (23:57 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M5.7 17 km E of Gero, 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
- 1984-09-13 23:57:29 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 35.898° N, 137.581° 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
- OPERATOR_ASSIGNED
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.9 and up: 5 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.417 km E of Gero, Japan · 15349 days ago · 10 km deep · 18 km away
- 5.717 km E of Gero, Japan · 15348 days ago · 10 km deep · 20 km away
- 5.017 km E of Gero, Japan · 15348 days ago · 10 km deep · 20 km away
- 4.320 km E of Gero, Japan · 15348 days ago · 5 km deep · 18 km away
- 5.130 km E of Gero, Japan · 15330 days ago · 15 km deep · 10 km away
Before
Earthquakes todayJapan earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00027cc. Read Tue, Sep 22, 2026, 8:45 PM UTC.