M4.7 earthquake 78 km SSE of Hasaki, Japan
A magnitude 4.7 earthquake struck 78 km SSE of Hasaki, Japan on Mon, Sep 2, 1985, 12:23 AM JST (15:23 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.4 62 km SE of Katsuura, Japan. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.7 (mb), light
- Local time
- UTC
- 1985-09-01 15:23:16 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 35.113° N, 141.258° 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 1.7 and up: 2 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.966 km SSE of Katsuura, Japan · 14972 days ago · 75 km deep · 92 km away
- 5.462 km SE of Katsuura, Japan · 14969 days ago · 74 km deep · 54 km away
Before
Earthquakes todayJapan earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002jbb. Read Sun, Sep 27, 2026, 8:45 PM UTC.