Very strong mag. 6.4 earthquake - 121 km east of Hachinohe, Aomori, Japan, on Monday, March 29, 1965 at 10:47 GMT

Date & time: Mar 29, 1965 10:47:38 UTC
Magnitude: 6.4
Depth: 30.0 km
Epicenter latitude / longitude: 40.687°N / 142.915°E (North Pacific Ocean, Japan)
Antipode: 40.687°S / 37.085°W
Nearest volcano: Osore-yama (158 km / 98 mi)
Nearby towns and cities:
121 km (75 mi) E of Hachinohe (pop: 239,000) --> See nearby quakes!
129 km (80 mi) E of Misawa (pop: 42,800) --> See nearby quakes!
142 km (88 mi) NE of Miyako (pop: 51,700) --> See nearby quakes!
158 km (98 mi) ESE of Mutsu (pop: 49,200) --> See nearby quakes!
180 km (112 mi) NNE of Kamaishi (pop: 43,100) --> See nearby quakes!
184 km (115 mi) E of Aomori (pop: 298,400) --> See nearby quakes!
186 km (115 mi) NE of Morioka (pop: 295,200) --> See nearby quakes!
189 km (117 mi) ENE of Hanawa (Kazuno) (pop: 36,900) --> See nearby quakes!
295 km (183 mi) SSE of Sapporo (pop: 1,883,000) --> See nearby quakes!
623 km (387 mi) NNE of Tokyo (pop: 8,336,600) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 2.5 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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Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 251 km² (=97 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 27 km (17 mi).
Aftershocks typically occur during the weeks and months following the quake at or near the same fault, at distances of up to approx. two times the length of the rupture zone.
The often broadly linear arrangement of aftershock epicenters encompasses the rupture zone of the main shock (check on the map below to verify).

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