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Seismotectonic Reactions to the Arc‐continent Convergence in Central Philippines
Author(s) -
Ramos Noelynna T.,
Dimalanta Carla B.,
Besana Glenda M.,
Tamayo Rodolfo A.,
Yumul Graciano P.,
Maglambayan Victor B.
Publication year - 2005
Publication title -
resource geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.597
H-Index - 43
eISSN - 1751-3928
pISSN - 1344-1698
DOI - 10.1111/j.1751-3928.2005.tb00241.x
Subject(s) - geology , hypocenter , seismology , induced seismicity , archipelago , tectonics , subduction , block (permutation group theory) , slab , island arc , collision zone , eurasian plate , paleontology , oceanography , geometry , mathematics
. High seismic activity in the Philippines originates from tectonic convergence related to surface and subsurface seismotectonic features. Based on earthquake data, the archipelago can be divided into the seismically‐active Philippine Mobile Belt and the aseismic North Palawan Block. The latter represents a rifted continental fragment of the Eurasian margin that juxtaposed with the rest of island arc units in central Philippines. Earthquake hypocenter plots on planar and in vertical profiles show that the seismic events are associated with known seismotectonic features. In addition, data suggest that the collision zone between the North Palawan Block and the Philippine Mobile Belt is characterized by a decreased amount of hypocenters at > 100 km depths. Although field evidence favors the presence of a subducted slab or slabs beneath western central Philippines, these are difficult to image using the present seismicity distribution dataset.