Strong mag. 6.3 earthquake - North Pacific Ocean, 456 km northeast of Tokyo, Japan, on Sunday, 21 April 1968 at 08:34 (GMT)
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Strong magnitude 6.3 earthquake at 25 km depth
Depth: 25.0 km
Epicenter latitude / longitude: 38.621°N / 143.286°E (North Pacific Ocean, Japan)
Nearest volcano: Kurikoma (219 km / 136 mi)
Nearby towns and cities:
143 km (89 mi) ESE of Kamaishi (pop: 43,100) --> See nearby quakes!
145 km (90 mi) ESE of Ōfunato (pop: 35,400) --> See nearby quakes!
146 km (91 mi) SE of Ōtsuchi (Kamihei-gun) (pop: 16,500) --> See nearby quakes!
149 km (93 mi) SE of Yamada (Shimohei-gun) (pop: 20,100) --> See nearby quakes!
163 km (101 mi) SE of Miyako (pop: 51,700) --> See nearby quakes!
174 km (108 mi) E of Ishinomaki (pop: 117,200) --> See nearby quakes!
190 km (118 mi) E of Ichinoseki (pop: 63,000) --> See nearby quakes!
202 km (125 mi) ESE of Kitakami (pop: 93,900) --> See nearby quakes!
214 km (133 mi) ENE of Sendai (pop: 1,063,100) --> See nearby quakes!
456 km (283 mi) NE of Tokyo (pop: 8,336,600) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1.8 x 1014 joules (49.4 gigawatt hours, equivalent to 42502 tons of TNT or 2.7 atomic bombs!) More info
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.
|M 6.3||25 km||off the east coast of Honshu, Japan||USGS|
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Aftershocks of the 6.3 quake North Pacific Ocean, 456 km northeast of Tokyo, Japan, 21 April 1968 08:34 GMT
More infoRecorded aftershocks, latest first (2 quakes):
- 16 Aug 1968 10:39 UTC| M 5.9 |15 km (9.3 mi) depth|25 km (16 mi) distance| USGS | Details
- 17 Jun 1968 18:57 UTC| M 6.4 |25 km (15.5 mi) depth|57 km (35 mi) distance| USGS | Strong mag. 6.4 earthquake - North Pacific Ocean, 187 km east of Kamaishi, Iwate, Japan, on Monday, 17 June 1968 at 18:57 (GMT)