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Major magnitude 6.9 earthquake - 134 km east of Shikotan, Sakhalin Oblast, Russia, on Saturday, December 21, 1946 at 10:18 GMT

Major magnitude 6.9 earthquake - 134 km east of Shikotan, Sakhalin Oblast, Russia, on Saturday, December 21, 1946 at 10:18 GMT Major magnitude 6.9 earthquake - 134 km east of Shikotan, Sakhalin Oblast, Russia, on Saturday, December 21, 1946 at 10:18 GMT

Major magnitude 6.9 earthquake at 20 km depth

Date & time: Dec 21, 1946 10:18:48 UTC
Magnitude: 6.9
Depth: 20.0 km
Epicenter latitude / longitude: 43.632°N / 148.374°E (North Pacific Ocean, Russia)
Antipode: 43.632°S / 31.626°W
Nearest volcano: Urbich Caldera (143 km / 89 mi)
Nearby towns and cities:
134 km (83 mi) E of Shikotan (pop: 2,100) --> See nearby quakes!
182 km (113 mi) SSE of Kuril'sk (pop: 1,720) --> See nearby quakes!
206 km (128 mi) E of Yuzhno-Kurilsk (pop: 6,470) --> See nearby quakes!
207 km (129 mi) ESE of Otrada (pop: 3,220) --> See nearby quakes!
228 km (142 mi) E of Nemuro (Japan) (pop: 31,200) --> See nearby quakes!
261 km (162 mi) E of Shibetsu (Japan) (pop: 21,700) --> See nearby quakes!
332 km (206 mi) ENE of Kushiro (Japan) (pop: 183,600) --> See nearby quakes!
332 km (206 mi) E of Abashiri (Japan) (pop: 42,500) --> See nearby quakes!
344 km (214 mi) E of Motomachi (Abashiri District, Japan) (pop: 23,000) --> See nearby quakes!
361 km (224 mi) E of Kitami (Japan) (pop: 113,100) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1.4 x 1015 joules (392 gigawatt hours, equivalent to 3.4 x 105 tons of TNT or 21.1 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.
Mag.DepthLocationSource
6.920 kmeast of the Kuril Islands (Russia)USGS
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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Aftershocks

[More info]

Recorded aftershocks, latest first (2 quakes)

Date and timeMag
Depth
LocationDetails
Apr 14, 1947 07:15
75 years ago
6.9

30 km
143 km E of Shikotan, Sakhalin Oblast, RussiaMore
Jan 3, 1947 02:17
75 years ago
6.5

15 km
Russia, 265 km E of Nemuro, Hokkaido, JapanMore

Earlier earthquakes in the same area

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