Seismotectonic Reactions to the Arc-continent Convergence in Central Philippines |
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| Authors: | Noelynna T Ramos Carla B Dimalanta Glenda M Besana Rodolfo A Tamayo Jr Graciano P Yumul Jr Victor B Maglambayan |
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| Institution: | National Institute of Geological Sciences, College of Science, University of the Philippines, Diliman, Quezon City, Philippines 1101 [e-mail: ];Center for Seismology, Volcanology and Disaster Mitigation, Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan;Philippine Council for Industry and Energy, Research and Development, Department of Science and Technology, Bicutan, Taguig, Metro Manila, Philippines |
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| Abstract: | Abstract. 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. |
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| Keywords: | seismicity central Philippines arc-continent collision seismic gap |
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