| Magnitude | 5.2 |
| Alert | Strong |
| Depth | 33.0 km |
| Coordinates | 33.763, 141.566 |
| UTC time | 1978-08-21 15:58:17.000 |
Earthquake details
Monday, August 21, 1978 Earthquake
The earthquake hit Japan on Monday, August 21, 1978 at 15:58 UTC with a magnitude of 5.2. The closest known location in the current dataset is Isumi (Japan - JP), about 195.0 km away. The epicenter is located at longitude 141.566 and latitude 33.763.
| Location | Isumi |
| Country | Japan (JP) |
| Severity | Strong |
Earthquake map 1978-08-21
Nearby earthquakes
The latest 8 earthquakes within 100 km of this epicenter.
M 4.7
Hasaki
Japan · 2026-08-29 15:17 UTC
232.8 km
M 5.8
Matsudo
Japan · 2026-08-22 17:00 UTC
277.3 km
M 4.4
Kamisu
Japan · 2026-07-17 19:45 UTC
227.7 km
M 4.7
Narita
Japan · 2026-07-16 00:01 UTC
237.2 km
M 4.3
Kamisu
Japan · 2026-07-02 07:17 UTC
234.5 km
M 4.4
Tateyama
Japan · 2026-06-30 15:02 UTC
135.7 km
M 4.2
Chiba
Japan · 2026-06-26 18:59 UTC
256.2 km
M 4.3
Sakura
Japan · 2026-06-26 04:31 UTC
244.0 km
Stay informed
Earthquake alerts
Create targeted notifications for important seismic activity near the places you follow.