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Philippine Mobile Belt
The Philippine Mobile Belt is a complex portion of the tectonic boundary between the Eurasian Plate and the Philippine Sea Plate, comprising most of the country of the Philippines. It includes two subduction zones, the Manila Trench to the west and the Philippine Trench to the east, as well as the Philippine Fault System. Within the Belt, a number of crustal blocks or microplates which have been sheared off the adjoining major plates are undergoing massive deformation.〔(Modeling the Philippine Mobile Belt: Tectonic blocks in a deforming plate boundary zone Galgana, G. A.; Hamburger, M. W.; McCaffrey, R.; Bacolcol, T. C.; Aurelio, M. A. American Geophysical Union, Fall Meeting 2007, abstract #G21C-0670 )〕
Most segments of the Philippines, including northern Luzon, are part of the Philippine Mobile Belt, which is separate from the Philippine Sea Plate to the east, the Molucca Sea Collision Zone to the south, Sunda Plate to the southwest, and the South China Sea Basin to the west and north-west.〔Rangin and Pubellier (1990) in ''Tectonics of Circum-Pacific Continental Margins'' ISBN 90-6764-132-4 p140 ff〕 To the north it ends in eastern Taiwan, the zone of active collision between the North Luzon Trough portion of the Luzon Volcanic Arc and South China.〔Clift, Schouten and Draut (2003) in ''Intra-Oceanic Subduction Systems: Tectonic and Magmatic Processes'', ISBN 1-86239-147-5 p84-86〕 The Philippine Mobile Belt has also been called the ''Philippine Microplate''〔Hashimoto, M, ed., (1981) ''Accretion Tectonics in the Circum-Pacific Regions'', ISBN 90-277-1561-0 p302〕 and the ''Taiwan-Luzon-Mindoro Belt''.〔Nicolas Pinet and Jean Francois Stephan (1989) in ''Tectonics of Circum-Pacific Continental Margins'' ISBN 90-6764-132-4 p165〕
==Palawan and Sulu==
Although they are part of the Republic of the Philippines, Palawan with the Calamian Islands, plus the Sulu Archipelago with the Zamboanga Peninsula of western Mindanao, are the tops of two protruding north-eastern arms of the Sunda Plate. They are not part of the Philippine Mobile Belt but are in collision with it. The Sulu Trench marks the boundary of the Sulu micro-block with the Sulu Sea basin and the Palawan micro-block. The Palawan Trench marks the subduction boundary between the Palawan microblock and the Spratly Islands plateau of the South China Sea basin.〔Rangin and Pubellier (1990) in ''Tectonics of Circum-Pacific Continental Margins'' ISBN 90-6764-132-4 p148〕 The Palawan/Calamian arm was also known in 1981 as the Palawan block and Palawan microcontinent,〔Hashimoto, M, ed., (1981) ''Accretion Tectonics in the Circum-Pacific Regions'', ISBN 90-277-1561-0 p303〕 and in 1989 as the Palawan Micro-Block.〔Nicolas Pinet and Jean Francois Stephan (1989) in ''Tectonics of Circum-Pacific Continental Margins'' ISBN 90-6764-132-4 p167 Fig 1, p175, p177〕
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