PHILIPPINE FAULT LINES AND TRENCHES

This is a map showing the active faults and trenches in the Philippines. The Philippine Fault Zone is a 1,200 km zone that runs across the country. It extends from Bangui, Ilocos Norte, crosses Infanta, Quezon and travels across Northern Samar, and traverses up to Mati, Davao Oriental.

The fault zone has been the source of large-magnitude earthquakes over the years including magnitude 7.7 Luzon earthquake in 1990 and the magnitude 6.2 Masbate earthquake in 2003.

List of faults in the Philippines:
Bangui Fault
West Ilocos Fault System
Dummon River Fault Sytem
Abra River Fault
Divalacan Fault
Tubao Fault
Casiguran Fault
East Zamabales Fault
Iba Fault
Digdig Fault
Infanta Fault
Guinyangan Fault
Valley Fault System
Central Marinduque Fault
Lubang Fault
Sibuyan Fault
Central Mindoro Fault
Aglubang River Fault
Lake Bato Lineament
Southern Mindoro Fault
Northern Samar Lineament
Tablas Fault
Masbate Fault
Southern Samar Lineament
West Panay Fault
Central Negros Fault
Cebu Linemanet
Central Leyte Fault
East Bohol Fault
Cabanglasan Fault
Tagoloan River Fault
Lanao Fault System
Davao River Fault
Lianga Fault
Eastern Mindanao Fault
Central Mindanao Fault
Mati Fault
Tangbulan Fault
Mindanao Fault Daguma Extension
Zamboanga Fault System

The Philippines has six trenches.

The Philippine Trench is an underwater or submarine trench to the east of the Philippines that has a length of about 1,320 km and a width of about 30 km. Separated by the Benham Plateau, on its north is the East Luzon Trench.

Other trenches include Manila Trench, Negros Trench, Sulu Trench, and Cotabato Trench.




References:
http://www.affordablecebu.com/load/philippine_government/philippines_fault_lines_and_trenches/5-1-0-28503
http://www.phivolcs.dost.gov.ph/index.php?option=com_content&view=article&id=379&Itemid=500023