Earthquake details

Thursday, September 20, 1984 Earthquake

The earthquake hit Japan on Thursday, September 20, 1984 at 16:56 UTC with a magnitude of 5.5. The closest known location in the current dataset is Isumi (Japan - JP), about 174.0 km away. The epicenter is located at longitude 141.592 and latitude 34.010.

Magnitude 5.5
Alert Strong
Depth 29.9 km
Coordinates 34.010, 141.592
UTC time 1984-09-20 16:56:24.340
Location Mobara
Country Japan (JP)
Severity Strong

Earthquake map 1984-09-20

Nearby earthquakes

The latest 8 earthquakes within 100 km of this epicenter.
M 4.5
Chiba
Japan · 2026-10-21 01:04 UTC
240.6 km
M 5.3
Narita
Japan · 2026-10-01 12:27 UTC
210.8 km
M 4.9
Saitama
Japan · 2026-09-28 19:45 UTC
283.3 km
M 5.0
Kashiwa
Japan · 2026-09-16 15:07 UTC
268.7 km
M 4.7
Hasaki
Japan · 2026-08-29 15:17 UTC
206.7 km
M 5.8
Matsudo
Japan · 2026-08-22 17:00 UTC
254.9 km
M 4.4
Kamisu
Japan · 2026-07-17 19:45 UTC
201.1 km
M 4.7
Narita
Japan · 2026-07-16 00:01 UTC
213.2 km

Stay informed

Earthquake alerts

Create targeted notifications for important seismic activity near the places you follow.

Choose the places you want to monitor.
Set a minimum magnitude for notifications.