English: 1. Northwestard subduction of the Philippine Sea Plate (PSP) beneath the Philippine Mobile Belt (PMB) along the East Luzon Trough (ELT) and Philippine Trenceh (PT)

2. Southeastward subduction of Sundaland Plate (SP) beneath the PMB along Manila (MT), Negros (NT), Sulu (ST), and Cotabato (CT) trenches. Trenches represent the deepest portions (dark blue) of the surrounding seas

3. Subduction along MT and NT is interrupted by the collision of the Palawan-Mindoro Continental Block (PCB) with the PMB along the Palawan-Mindoro Collision Zone (PCZ).

4. The Philippine Fault Zone (PFZ) traverses the length of the PMB.

5. Active volcanoes generally align with the trenches, and are found directly above the subducted lithospheric slabs.

For the profiles corresponding to A-A', B-B', and C-C', see https://commons.wikimedia.org/wiki/File:Philippine_plate_tectonics_-_selected_profiles.png .

Map created using the Free and Open Source QGIS (3.8.1-Zanzibar). Tectonic features adopted and modified from Aurelio et al (2013), bathymetric data from GEBCO Compilation Group (2020); volcano data from PHIVOLCS (2016), subducting slab data from Hayes (2018).

References:

Aurelio, M. A., Peña, R. E., & Taguibao, K. J. L. (2013). Sculpting the Philippine archipelago since the Cretaceous through rifting, oceanic spreading, subduction, obduction, collision and strike-slip faulting: Contribution to IGMA5000. Journal of Asian Earth Sciences, 72, 102–107. https://doi.org/10.1016/j.jseaes.2012.10.007

GEBCO Compilation Group 2020. (2020). GEBCO_2020 Grid. British Oceanographic Data Centre. doi:10.5285/a29c5465-b138-234d- e053-6c86abc040b9

Hayes, G. (2018). Slab2—A comprehensive subduction zone geometry model: U.S. Geological Survey Data Release [Data set]. United States Geological Survey. https://doi.org/10.5066/F7PV6JNV

PHIVOLCS. (2016). Volcanoes of the Philippines. https://www.phivolcs.dost.gov.ph/index.php/volcano-hazard/volcanoes-of-the-philippines