The island of Taiwan lies in a complex tectonic area between the Eurasian plate and the philippine plate. The upper part of the crust on the island is primarily made up of a series of terranes, mostly old island arcs which have been forced together by the collision of the Eurasian and Philippine plates. These have been further uplifted as a result of the detachment of a portion of the Eurasian Plate as it subducted beneath the Philippine Plate, a process which left the crust under Taiwan more buoyant.
The major seismic faults in Taiwan correspond to the various suture zones between the various terranes. These have produced major quakes throughout the history of the island.
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