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Date & time: Tuesday, 6 May 1919 19:41 UTC
Magnitude: 7.8
Depth: 35.0 km
Epicenter latitude / longitude: 4.852°S / 153.714°E (Papua New Guinea)
Nearest volcano: Ambitle (86 km / 53 mi)
Primary data source: USGS
Estimated released energy: 3.2 x 10¹⁶ joules (8784 gigawatt hours, equivalent to 7.6 x 10⁶ tons of TNT or 472.4 atomic bombs!) [learn more]

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Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 6310 km² (=2436 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 138 km (85 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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