| Magnitude | 5.7 |
| Alert | Strong |
| Depth | 32.7 km |
| Coordinates | 33.975, 141.554 |
| UTC time | 1984-09-20 21:53:55.250 |
Earthquake details
Thursday, September 20, 1984 Earthquake
The earthquake hit Japan on Thursday, September 20, 1984 at 21:53 UTC with a magnitude of 5.7. The closest known location in the current dataset is Isumi (Japan - JP), about 174.9 km away. The epicenter is located at longitude 141.554 and latitude 33.975.
| Location | Mobara |
| Country | Japan (JP) |
| Severity | Strong |
Earthquake map 1984-09-20
Closest countries
The 12 closest cities near the epicenter.
| Isumi | 174.9 km |
| Kamogawa | 182.7 km |
| Minamibōsō | 190.0 km |
| Tateyama | 191.2 km |
| Mobara | 198.3 km |
| Ōamishirasato | 203.3 km |
| Ōami | 205.6 km |
| Tōgane | 206.2 km |
| Hasaki | 206.5 km |
| Asahi | 210.7 km |
| Sanmu | 211.3 km |
| Yōkaichiba | 212.8 km |
Nearby earthquakes
The latest 8 earthquakes within 100 km of this epicenter.
M 4.8
Chiba
Japan · 2026-08-14 09:58 UTC
40.5 km
M 4.5
Chiba
Japan · 2026-07-16 16:04 UTC
46.1 km
M 4.3
Chiba
Japan · 2026-05-23 03:34 UTC
55.3 km
M 5.0
Chiba
Japan · 2026-04-16 14:43 UTC
83.2 km
M 4.6
Chiba
Japan · 2026-02-12 19:51 UTC
50.6 km
M 5.1
Chiba
Japan · 2025-12-21 06:58 UTC
92.1 km
M 4.7
Mobara
Japan · 2025-11-04 22:17 UTC
98.7 km
M 4.5
Chiba
Japan · 2025-10-01 19:26 UTC
99.5 km
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