| 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 4.0
Tokyo
Japan · 2026-04-05 23:17 UTC
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249.8 km |
|
M 4.9
Kashiwa
Japan · 2026-04-01 01:06 UTC
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274.7 km |
|
M 4.1
Fujisawa
Japan · 2026-03-28 10:36 UTC
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232.6 km |
|
M 4.4
Kamisu
Japan · 2026-02-26 11:55 UTC
|
155.1 km |
|
M 4.4
Isumi
Japan · 2026-02-19 08:24 UTC
|
172.2 km |
|
M 4.0
Kisarazu
Japan · 2026-02-10 16:12 UTC
|
126.5 km |
|
M 4.2
Saitama
Japan · 2026-02-06 15:58 UTC
|
280.3 km |
|
M 4.5
Sakura
Japan · 2026-02-05 00:19 UTC
|
204.0 km |
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