Very strong mag. 6.5 earthquake - 30 km northwest of Pulau Umang Island, Banten, Indonesia, on Monday, December 16, 1963 at 01:51 GMT

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Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 316 km² (=122 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 31 km (19 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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