Major magnitude 8.6 earthquake - 27 mi southeast of Anagaksik Island, Aleutians West, Alaska, USA, on Saturday, March 9, 1957 at 14:22 GMT

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Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 39811 km² (=15371 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 346 km (215 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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