GEOLOGICAL SOCIETY OF THE PHILIPPINES

CURRENT TECTONIC FEATURES OF THE PHILIPPINES FROM GEOMORPHIC, GEOPHYSICAL, GEOLOGIC AND GPS DATA

 

Ramos, E. G.*, Morado, A. A. Jr.**, Aurelio, M. A.*** and Ferrer, A. P.**

*Philippne Institute of Volcanology & Seismology
Quezon City, Metro Manila, Philippines
**COMEXCO, Incorporated
Pasig City, Metro Manila,
***Mines and Geosciences Bureau
Quezon City, Metro Manila, Philippines

 

ABSTRACT

        Details in the tectonic features of the Philippines can be seen in the recent geomorphic, geophysical and geologic and GPS data, hinting on the geometry of boundaries, nature of deformation processes and direction of ongoing movement of crustal segments that make up the archipelago. Integration of the data with geologic, structural and seismicity data suggests discontinuities in the major subduction zones, existence of possible recently abandoned arcs and imbricate relationship between some crustal blocks. These interpretations coincide with much of earlier notions about the plate tectonics of the Philippines, and with the concept that the archipelago is an amalgamation of arcs, oceanic and continental blocks whose boundaries had been actively shifting. The present observable features can be attributed to the inhomogeneity of the crust that composes the region, causing shifts in position of the margins and convergence of some blocks, and to changes in the direction of movement of the surrounding tectonic plates (or in the orientation of stress). All these features indicate that the Philippine archipelago is mainly a complicated tectonic margin absorbing the deformation between the Philippine Sea and the Eurasian tectonic plates.

 
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