Very strong mag. 6.4 earthquake - 226 km east of Morioka, Iwate, Japan, on Tuesday, February 20, 1979 at 06:32 GMT

Very strong mag. 6.4 earthquake - 226 km east of Morioka, Iwate, Japan, on Tuesday, February 20, 1979 at 06:32 GMT Very strong mag. 6.4 earthquake - 226 km east of Morioka, Iwate, Japan, on Tuesday, February 20, 1979 at 06:32 GMT

Very strong magnitude 6.4 earthquake at 10 km depth

1 Jan 00:00 UTC: First to report: USGS after 30 seconds.

Earthquake details

Date & timeFeb 20, 1979 06:32:32 UTC
Local time at epicenter
StatusConfirmed
Magnitude6.4
Depth10.0 km
Epicenter latitude / longitude40.232°N / 143.703°E (North Pacific Ocean, Japan)
Antipode40.232°S / 36.297°W
Shaking intensityVery strong shaking near epicenter
Felt0 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoOsore-yama (219 km / 136 mi)
Nearby towns and cities164 km (102 mi) ENE of Miyako (pop: 51,700) | Show on map | Quakes nearby
172 km (107 mi) ENE of Yamada (Shimohei-gun) (pop: 20,100) | Show on map | Quakes nearby
182 km (113 mi) ENE of Ōtsuchi (Kamihei-gun) (pop: 16,500) | Show on map | Quakes nearby
189 km (117 mi) E of Hachinohe (pop: 239,000) | Show on map | Quakes nearby
189 km (118 mi) NE of Kamaishi (pop: 43,100) | Show on map | Quakes nearby
226 km (140 mi) ENE of Morioka (pop: 295,200) | Show on map | Quakes nearby
245 km (152 mi) ENE of Kitakami (pop: 93,900) | Show on map | Quakes nearby
259 km (161 mi) ESE of Aomori (pop: 298,400) | Show on map | Quakes nearby
371 km (231 mi) SSE of Sapporo (pop: 1,883,000) | Show on map | Quakes nearby
615 km (382 mi) NNE of Tokyo (pop: 8,336,600) | Show on map | Quakes nearby
Estimated seismic energy released2.5 x 1014 joules (69.8 gigawatt hours, equivalent to 60036 tons of TNT or 3.8 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
6.410 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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Aftershocks

[More info]

Recorded aftershocks, latest first (10 quakes)

Date and timeMag
Depth
LocationDetails
Jul 12, 1979 17:22
43 years ago
4.0

36 km
97 km E of Miyako, Iwate, JapanMore
Apr 22, 1979 02:39
43 years ago
4.9

31 km
238 km NE of Morioka, Iwate, JapanMore
Apr 14, 1979 14:40
43 years ago
3.8

33 km
123 km E of Sangan-jima Island, Iwate, JapanMore
Mar 13, 1979 07:24
43 years ago
4.7

33 km
133 km E of Sangan-jima Island, Iwate, JapanMore
Mar 10, 1979 12:55
43 years ago
4.7

66 km
249 km E of Morioka, Iwate, JapanMore
Feb 28, 1979 06:56
43 years ago
4.7

33 km
240 km E of Morioka, Iwate, JapanMore
Feb 24, 1979 22:01
44 years ago
5.1

33 km
223 km E of Morioka, Iwate, JapanMore
Feb 21, 1979 13:39
44 years ago
5.5

30 km
229 km E of Morioka, Iwate, JapanMore
Feb 21, 1979 12:36
44 years ago
4.7

33 km
237 km E of Morioka, Iwate, JapanMore
Feb 20, 1979 07:05
44 years ago
5.0

10 km
241 km E of Morioka, Iwate, JapanMore

Earlier earthquakes in the same area

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