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The Philippine Mobile Belt (also called as Taiwan–Luzon–Mindoro Mobile Belt [11]) is a complex tectonic zone which sits at the convergence zone of the Eurasian plate, Philippine Sea plate, and Indo-Australian plate. [9] It covers the whole Philippine archipelago and extends southwards to the Molucca Sea and eastern Indonesia.
The Philippine Sea plate or the Philippine plate is a tectonic plate comprising oceanic lithosphere that lies beneath the Philippine Sea, to the east of the Philippines. Most segments of the Philippines, including northern Luzon , are part of the Philippine Mobile Belt , which is geologically and tectonically separate from the Philippine Sea plate.
Obduction zones occurs when the continental plate is pushed under the oceanic plate, but this is unusual as the relative densities of the tectonic plates favours subduction of the oceanic plate. This causes the oceanic plate to buckle and usually results in a new mid-ocean ridge forming and turning the obduction into subduction. [citation needed]
Where the plates meet, their relative motion determines the type of plate boundary (or fault): convergent, divergent, or transform. The relative movement of the plates typically ranges from zero to 10 cm annually. Faults tend to be geologically active, experiencing earthquakes, volcanic activity, mountain-building, and oceanic trench formation.
Continental-continental divergent/constructive boundary Oceanic divergent boundary: mid-ocean ridge (cross-section/cut-away view). In plate tectonics, a divergent boundary or divergent plate boundary (also known as a constructive boundary or an extensional boundary) is a linear feature that exists between two tectonic plates that are moving away from each other.
In Nankai Trough (Formed by oblique subduction of the Philippine Sea Plate), [22] seismic profiles reveal that the margin parallel strike slip fault and thrust structures are linked by the mega splay fault system, which align in a parallel manner with the subducting plate (i.e. Philippine Sea Plate). [21] Curved fault model
Major physiographic elements of the Philippine Mobile Belt Puerto Princesa Subterranean River National Park marker describing the geologic history of the Philippines. In the geology of the Philippines, 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.
The Philippine Mobile Belt is compressed on the west by the Eurasian plate and two arms of the Sunda plate, and on the east by the Philippine Sea plate. These tectonic plates have compressed and lifted parts of the Philippines causing extensive faulting, primarily on a north–south axis.