The Philippine Institute for Volcanology and Seismology maps out the faults and trenches all over the country. They also put out more detailed maps showing the location of fault lines per region.

Distribution of Active Faults and Trenches in Region I

Distribution of Active Faults and Trenches in CAR and Region II

Distribution of Active Faults in Region 4-A

Distribution of Active Faults in Region 5

Distribution of Active Faults in Region 6

Distribution of Active Faults in Region 7

Distribution of Active Faults in Region 8

Distribution of Active Faults in Region 9

Distribution of Active Faults in Region 10

Distribution of Active Faults in Region 11

Distribution of Active Faults in Region 12

Distribution of Active Faults in the Autonomous Region in Muslim Mindanao (ARMM)

Distribution of Active Faults in ARMM (Maguindanao and Lanao del Sur)

* Regions 3, 4-B and CARAGA are not available

Source: Philippine Institute for Volcanology and Seismology