Major magnitude 8.7 earthquake - 23 mi southwest of Amchitka Island, Aleutians West, Alaska, USA, on Thursday, February 4, 1965 at 05:01 GMT

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Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 50119 km² (=19351 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 388 km (241 mi).
Aftershocks typically occur during the weeks, months or even years 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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