Major magnitude 7.4 earthquake - 5.4 km south of Santa Maria Zapotitlan, Santa Maria Ecatepec, Oaxaca, Mexico, on Monday, August 23, 1965 at 19:46 GMT

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Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 2512 km² (=970 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 87 km (54 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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