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Tsunami damage at Barangay Tibpuan, Lebak, Mindanao. Several fault zones in the region are capable of producing major earthquakes and destructive local tsunamis. The two major fault zones that are most dangerous are the Sulu Trench in the Sulu Sea and the Cotabato Trench, a region of subduction that crosses the Celebes Sea and the Moro Gulf in Southern Mindanao.
Mindanao Fault – a prominent NW-trending linear fracture zone on the western third of Mindanao Island and has 2 distinct segments, including that which separates the Daguma Range from the Cotabato Basin corresponding to the Cotabato Fault segment. This segment is highly linear and has features suggestive of normal faulting although it may ...
On Luzon, the fault zone splays out into a number of different faults, including the Digdig Fault. One of the largest historical earthquake on the fault zone was the 1990 Luzon M s 7.8 event that left nearly 2,000 people dead or missing. The same part of the fault zone is thought to have ruptured in the 1645 Luzon earthquake. [7]
The Philippine Fault is a left-lateral strike-slip fault which cuts across the Philippine archipelago behind the subduction zone. It is a northwest–southeast trending fault, which aligns subparallel to the Philippine Trench, extends from northern Luzon to Mindanao.
Major subduction complexes are also active along the southwestern coast of Mindanao at the Cotabato Trench and along the Manila Trench of the west Luzon. Running through the Philippine Mobile Belt is the Philippine fault system; a large 1,200-kilometer-long, highly segmented strike-slip fault system. This left-lateral system of faults runs from ...
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A finite fault model suggests rupture occurred around an elliptical area measuring 80 km × 80 km (50 mi × 50 mi). Maximum slip was concentrated around the epicenter, although slightly up-dip, which was estimated at up to 1.8 m (5 ft 11 in). [7]
The Philippine fault has been slipping at a rate of 33 ± 11 mm/yr in the northern and central Leyte sections. The southern part of the Philippine fault is mainly located in eastern Mindanao and constitutes a complex fault system with discrete strands and splays.