Major magnitude 6.3 earthquake - 5.7 mi south of Brawley, Imperial County, California, USA, on Thursday, April 19, 1906 at 00:30 GMT

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Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 200 km² (=77 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 24 km (15 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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