Major magnitude 7.7 earthquake - 46 km southeast of Kasakai-jima Island, Japan, on Monday, June 12, 1978 at 08:14 GMT

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Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 5012 km² (=1935 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 123 km (76 mi).
Aftershocks typically occur during the weeks, months or even a year 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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