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Christensen and Mooney give an typical P wave velocity of six.5 km−1 and mean density of 2830 kgm−3 with an typical thickness of 46 km for orogens and 30 km for extended crust. In contrast, oceanic crust is usually 7 km thick, and, in its reduce element usually has a P wave velocity of 7.five km−1 (White et al., 1992). Traditionally, continents have been subdivided into cratons, platforms, Phanerozoic orogenic belts, narrow rifts, and broad extensional provinces (Levander et al.,…