Very strong mag. 6.6 earthquake - 6 km west of South Upi, Province of Maguindanao, Mindanao Musulman, Philippines, on Friday, September 26, 1919 at 19:39 GMT

Date & time: Sep 26, 1919 19:39:43 UTC
Magnitude: 6.6
Depth: 35.0 km
Epicenter latitude / longitude: 6.85°N / 124.098°E (Province of Maguindanao, Mindanao Musulman, Philippines)
Antipode: 6.85°S / 55.902°W
Nearest volcano: Blit (19 km / 12 mi)
Nearby towns and cities:
6 km (4 mi) WNW of South Upi (Maguindanao, Autonomous Region in Muslim Mindanao) (pop: 12,500) --> See nearby quakes!
38 km (24 mi) W of Maganoy (Maguindanao, Autonomous Region in Muslim Mindanao) (pop: 17,400) --> See nearby quakes!
45 km (28 mi) SSW of Cotabato City (Autonomous Region in Muslim Mindanao) (pop: 179,400) --> See nearby quakes!
45 km (28 mi) SW of Pagaluñgan (Maguindanao, Autonomous Region in Muslim Mindanao) (pop: 31,100) --> See nearby quakes!
54 km (34 mi) SW of Malingao (Soccsksargen) (pop: 1,122,000) --> See nearby quakes!
55 km (34 mi) SW of Budta (Autonomous Region in Muslim Mindanao) (pop: 1,273,700) --> See nearby quakes!
61 km (38 mi) SSW of Parang (Autonomous Region in Muslim Mindanao) (pop: 44,900) --> See nearby quakes!
66 km (41 mi) WNW of Tacurong City (Soccsksargen) (pop: 54,600) --> See nearby quakes!
91 km (57 mi) WNW of Koronadal (Soccsksargen) (pop: 125,500) --> See nearby quakes!
927 km (576 mi) SSE of Manila (National Capital Region) (pop: 1,600,000) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 5 x 10¹⁴ joules (139 gigawatt hours, equivalent to 1.2 x 10⁵ tons of TNT or 7.5 atomic bombs!) | about seismic energy

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Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 398 km² (=154 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 35 km (21 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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