Very strong mag. 6.5 earthquake - 133 km south of Obihiro, Hokkaido, Japan, on Sunday, December 6, 1970 at 20:20 GMT

Very strong mag. 6.5 earthquake - 133 km south of Obihiro, Hokkaido, Japan, on Sunday, December 6, 1970 at 20:20 GMT Very strong mag. 6.5 earthquake - 133 km south of Obihiro, Hokkaido, Japan, on Sunday, December 6, 1970 at 20:20 GMT

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 & timeDec 6, 1970 20:20:52 UTC
Local time at epicenter
Depth40.0 km
Epicenter latitude / longitude41.787°N / 143.742°E (North Pacific Ocean, Japan)
Antipode41.787°S / 36.258°W
Shaking intensityStrong shaking near epicenter
Felt0 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoShikaribetsu Group (173 km / 107 mi)
Nearby towns and cities129 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 released3.5 x 1014 joules (98.6 gigawatt hours, equivalent to 84802 tons of TNT or 5.3 atomic bombs!) | about seismic energy
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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.
6.540 kmHokkaido, Japan regionUSGS
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake.
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Recorded aftershocks, latest first (2 quakes)

Date and timeMag
Mar 15, 1971 05:35
51 years ago

34 km
143 km SE of Obihiro, Hokkaido, JapanMore
Jan 18, 1971 05:02
52 years ago

45 km
86 km S of Shizunai-furukawachō, Hidaka-gun, Hokkaido, JapanMore

Earlier earthquakes in the same area

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