Geological Investigation


The Philippine Islands are situated on the circumpacific seismic belt, which is one of the areas in the world that is most conspicuously subject to earthquake. The Philippine archipelago is bounded on the east by active subduction faults known as the Philippine Trough and Mindanao Trough. Another fault known as the Philippine Master Fault crosses Central Luzon southeastwards from Lingayan Gulf to Dingalan Bay in Quezon Province, then trends southwards close to the east coast of Quezon Province and along the west coast of Bicol Peninsula to eastern Visayas, and then to Mindanao where it divides and forms the graben between the Province of Surigao and Bukidnon (Reference 3). The regional geological structure is shown in Figure B2.1).

Source InstitutionJapan International Cooperation Agency
Source URL
Page Count60
Place of PublicationManila
Original Publication Date