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Major magnitude 6.8 earthquake - 434 km northeast of Tokyo, Japan, on Monday, April 7, 1958 at 18:05 GMT

Major magnitude 6.8 earthquake - 434 km northeast of Tokyo, Japan, on Monday, April 7, 1958 at 18:05 GMT Major magnitude 6.8 earthquake - 434 km northeast of Tokyo, Japan, on Monday, April 7, 1958 at 18:05 GMT

Major magnitude 6.8 earthquake at 10 km depth

Date & time: Apr 7, 1958 18:05:05 UTC
Magnitude: 6.8
Depth: 10.0 km
Epicenter latitude / longitude: 38.305°N / 143.317°E (North Pacific Ocean, Japan)
Antipode: 38.305°S / 36.683°W
Nearest volcano: Narugo (230 km / 143 mi)
Nearby towns and cities:
163 km (101 mi) ESE of Ofunato (pop: 35,400) --> See nearby quakes!
166 km (103 mi) SE of Kamaishi (pop: 43,100) --> See nearby quakes!
176 km (110 mi) E of Ishinomaki (pop: 117,200) --> See nearby quakes!
184 km (114 mi) E of Yamoto (Higashimatsushima) (pop: 32,000) --> See nearby quakes!
191 km (119 mi) SE of Miyako (pop: 51,700) --> See nearby quakes!
191 km (119 mi) SE of Tōno (pop: 26,800) --> See nearby quakes!
199 km (124 mi) E of Schiogama (pop: 59,500) --> See nearby quakes!
214 km (133 mi) E of Sendai (pop: 1,063,100) --> See nearby quakes!
434 km (270 mi) NE of Tokyo (pop: 8,336,600) --> See nearby quakes!
457 km (284 mi) NE of Yokohama (pop: 3,574,400) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1 x 1015 joules (278 gigawatt hours, equivalent to 2.4 x 105 tons of TNT or 14.9 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.
6.810 kmoff the east coast of Honshu, JapanUSGS
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 (4 quakes)

Date and timeMag
Sep 21, 1958 05:45
64 years ago

35 km
35 km SE of Kasakai-jima Island, JapanMore
Apr 11, 1958 00:58
64 years ago

20 km
446 km NE of Tokyo, JapanMore
Apr 10, 1958 11:50
64 years ago

15 km
428 km NE of Tokyo, JapanMore
Apr 7, 1958 18:30
64 years ago

15 km
441 km NE of Tokyo, JapanMore

Earlier earthquakes in the same area

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