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
Magnitude: 6.3
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.
| Magnitude | Depth | Location | Source |
| 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.
There are no user reports for this quake yet. If you felt it be the first to report it!
Aftershocks of the 6.3 quake North Pacific Ocean, 456 km northeast of Tokyo, Japan, 21 April 1968 08:34 GMT
More info
Recorded 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)
Earlier earthquakes in the same area
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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