With altimeter data from Geosat, ERS-1/2 and Topex/Poseidon, and the EGM96 geopotential model, we calculated various Earth gravity field models for the west Pacific, covering the area over 0∼45°N and 100∼150°E. Within the Philippine Sea and the South China Sea, lineations of the residual geoid relative to EGM96 are found to be parallel to or across spreading ridges. Some trails of spreading ridges and trench-arcs are evident in the gravity anomaly signature. The intensities of the subduction activity with the accompanying resistant compression are different along different segments of trench-arcs. The Moho depth is inversed from the Glenni geoid undulation, and the tectonic implications are discussed. The stress fields from long- and medium-wavelength mantle convections are calculated from EGM96. The stress field from short-wavelength mantle convection is calculated from the isostatic geoid undulation to a reasonable degree of precision. The models are discussed jointly to elucidate the geodynamic processes of evolution of the marginal sea basins and troughs. All these models display unique features that are representative of the tectonics and geodynamics of the marginal seas.
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- Joint Application of Altimeter Data and EGM96 to Submarine Tectonic and Geodynamic Study in West Pacific
- Springer Berlin Heidelberg
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