Moderate mag. 5.1 earthquake - Philippine Sea, 12 km west of Sigaboy Island, Philippines, on Tuesday, March 20, 2001 at 11:33 (GMT)

Date & time: Mar 20, 2001 11:33:10 UTC
Magnitude: 5.1
Depth: 119.1 km
Epicenter latitude / longitude: 6.639°N / 125.962°E (Philippine Sea, Philippines)
Antipode: 6.639°S / 54.038°W
Nearest volcano: Leonard Range (83 km / 52 mi)
Nearby towns and cities:
12 km (8 mi) W of Sigaboy (Davao Oriental) (pop: 7,980) --> See nearby quakes!
29 km (18 mi) S of Lupon (Davao Oriental) (pop: 27,200) --> See nearby quakes!
45 km (28 mi) SW of Mati (pop: 105,900) --> See nearby quakes!
46 km (29 mi) ENE of Malita (pop: 41,100) --> See nearby quakes!
56 km (35 mi) SSE of Samal (pop: 43,500) --> See nearby quakes!
62 km (38 mi) SE of Central (pop: 1,212,500) --> See nearby quakes!
68 km (42 mi) E of Digos (pop: 116,100) --> See nearby quakes!
80 km (50 mi) SSE of Panabo (pop: 84,700) --> See nearby quakes!
92 km (57 mi) S of Magugpo Poblacion (pop: 233,300) --> See nearby quakes!
179 km (112 mi) ESE of Budta (pop: 1,273,700) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 2.8 x 10¹² joules (783 megawatt hours, equivalent to 674 tons of TNT) | 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. 13 km² (=5 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 6 km (4 mi).
Aftershocks typically occur during the days and weeks 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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