Very strong mag. 6.5 earthquake - 133 km south of Obihiro, Hokkaido, Japan, on Sunday, December 6, 1970 at 20:20 GMT
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Very strong magnitude 6.5 earthquake at 40 km depth
1 Jan 00:00 UTC: First to report: USGS after 30 seconds.
Earthquake details
| Date & time | Dec 6, 1970 20:20:52 UTC |
| Local time at epicenter | |
| Status | Confirmed |
| Magnitude | 6.5 |
| Depth | 40.0 km |
| Epicenter latitude / longitude | 41.787°N / 143.742°E  (North Pacific Ocean, Japan) |
| Antipode | 41.787°S / 36.258°W |
| Shaking intensity | Strong shaking near epicenter |
| Felt | 0 reports |
| Primary data source | USGS (United States Geological Survey) |
| Nearest volcano | Shikaribetsu Group (173 km / 107 mi) |
| Nearby towns and cities | 129 km (80 mi) ESE of Shizunai-furukawachō (pop: 22,400) | Show on map | Quakes nearby 133 km (83 mi) SSE of Obihiro (pop: 173,900) | Show on map | Quakes nearby 141 km (88 mi) SSE of Otofuke (pop: 40,900) | Show on map | Quakes nearby 142 km (88 mi) SSW of Kushiro (pop: 183,600) | Show on map | Quakes nearby 200 km (124 mi) ESE of Tomakomai (pop: 174,800) | Show on map | Quakes nearby 207 km (128 mi) ESE of Chitose (pop: 92,900) | Show on map | Quakes nearby 225 km (140 mi) S of Kitami (pop: 113,100) | Show on map | Quakes nearby 243 km (151 mi) SE of Sapporo (pop: 1,883,000) | Show on map | Quakes nearby 274 km (170 mi) ENE of Aomori (pop: 298,400) | Show on map | Quakes nearby 764 km (474 mi) NNE of Tokyo (pop: 8,336,600) | Show on map | Quakes nearby |
| Estimated seismic energy released | 3.5 x 1014 joules (98.6 gigawatt hours, equivalent to 84802 tons of TNT or 5.3 atomic bombs!) | about seismic energy |
Data for the same earthquake reported by different agencies
Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
| Mag. | Depth | Location | Source |
| 6.5 | 40 km | Hokkaido, Japan region | USGS |
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Aftershocks
[More info]
Recorded aftershocks, latest first (2 quakes)
Date and time | Mag Depth | Location | Details |
| Mar 15, 1971 05:35 51 years ago | 5.7 34 km | 143 km SE of Obihiro, Hokkaido, Japan | More |
| Jan 18, 1971 05:02 52 years ago | 5.5 45 km | 86 km S of Shizunai-furukawachō, Hidaka-gun, Hokkaido, Japan | More |
Earlier earthquakes in the same area
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