| Magnitude | 5.5 |
| Alert | Strong |
| Depth | 182.4 km |
| Coordinates | 37.326, 138.748 |
| UTC time | 1971-09-21 08:43:32.600 |
Earthquake details
Tuesday, September 21, 1971 Earthquake
The earthquake hit Japan on Tuesday, September 21, 1971 at 08:43 UTC with a magnitude of 5.5. The closest known location in the current dataset is Ojiya (Japan - JP), about 5.4 km away. The epicenter is located at longitude 138.748 and latitude 37.326.
| Location | Nagaoka |
| Country | Japan (JP) |
| Severity | Strong |
Earthquake map 1971-09-21
Closest countries
The 12 closest cities near the epicenter.
| Ojiya | 5.4 km |
| Nagaoka | 16.5 km |
| Kashiwazaki | 18.1 km |
| Uonuma | 21.0 km |
| Tōkamachi | 21.5 km |
| Mitsuke | 28.3 km |
| Minamiuonuma | 29.3 km |
| Muikamachi | 31.3 km |
| Sanjō | 37.0 km |
| Tsubame | 40.8 km |
| Maki | 48.7 km |
| Jōetsu | 49.5 km |
Nearby earthquakes
The latest 8 earthquakes within 100 km of this epicenter.
|
M 4.8
Niigata
Japan · 2026-02-13 04:58 UTC
|
50.2 km |
|
M 4.3
Nagaoka
Japan · 2025-09-15 19:00 UTC
|
39.1 km |
|
M 4.2
Aizu-Wakamatsu
Japan · 2025-06-10 18:14 UTC
|
77.9 km |
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