| 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 4.8
Chiba
Japan · 2026-08-14 09:58 UTC
17.2 km
M 4.5
Chiba
Japan · 2026-07-16 16:04 UTC
68.3 km
M 4.6
Yokohama
Japan · 2026-06-06 11:29 UTC
90.4 km
M 4.3
Chiba
Japan · 2026-05-23 03:34 UTC
52.2 km
M 5.0
Chiba
Japan · 2026-04-16 14:43 UTC
68.8 km
M 4.6
Chiba
Japan · 2026-02-12 19:51 UTC
27.6 km
M 4.5
Chiba
Japan · 2025-10-01 19:26 UTC
85.4 km
M 4.9
Chiba
Japan · 2025-09-13 00:17 UTC
97.7 km
Stay informed
Earthquake alerts
Create targeted notifications for important seismic activity near the places you follow.