Major magnitude 6.7 earthquake - 6.9 mi north of Coalinga, Fresno County, California, USA, on Monday, May 2, 1983 at 23:42 GMT

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Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 501 km² (=194 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 39 km (24 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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