| Magnitude | 5.5 |
| Alert | Strong |
| Depth | 29.9 km |
| Coordinates | 34.010, 141.592 |
| UTC time | 1984-09-20 16:56:24.340 |
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.
| Location | Mobara |
| Country | Japan (JP) |
| Severity | Strong |
Earthquake map 1984-09-20
Closest countries
The 12 closest cities near the epicenter.
| Isumi | 174.0 km |
| Kamogawa | 182.6 km |
| Minamibōsō | 190.4 km |
| Tateyama | 191.8 km |
| Mobara | 197.2 km |
| Ōamishirasato | 202.0 km |
| Hasaki | 204.0 km |
| Ōami | 204.3 km |
| Tōgane | 204.8 km |
| Asahi | 208.6 km |
| Sanmu | 209.6 km |
| Yōkaichiba | 210.8 km |
Nearby earthquakes
The latest 8 earthquakes within 100 km of this epicenter.
M 4.7
Hasaki
Japan · 2026-08-29 15:17 UTC
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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
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M 4.3
Kamisu
Japan · 2026-07-02 07:17 UTC
209.9 km
M 4.2
Chiba
Japan · 2026-06-26 18:59 UTC
234.8 km
M 4.3
Sakura
Japan · 2026-06-26 04:31 UTC
220.4 km
M 4.5
Asahi
Japan · 2026-06-26 04:00 UTC
192.3 km
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