Major magnitude 8.0 earthquake - Sigaboy Island, 5.9 km west of La Union, Province of Davao Oriental, Philippines, on Monday, April 14, 1924 at 16:20 GMT

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Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 10000 km² (=3861 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 173 km (108 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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