海洋地质与第四纪地质2001，Vol.21Issue(1)：1-6,6.
太平洋卫星测高重力场与地球动力学特征
THE SATELLITE ALTIMETRY GRAVITY FIELD AND THE GEODYNAMIC FEATURE IN THE WEST PACIFIC
摘要
Abstract
Through synthetic processing of altimetry data from Geosat, ERS-1/2 and Topex/Poseidon, the satellite altimetry gravity field has been calculated in the West Pacific and tectonic information for different scales and depth s is separated and extracted from the gravity field in order to probe into geodynamics in marginal sea basins. The altimetry geoid undulation is mainly conducted by convergence between two or three plates, and its components at short wavelength characterize tectonics within basins. The altimetry free-air gravity anomaly can describe structure and basin on continental shelves, and its derived submarine topography contains lots of submarine tectonic information. The Moho depth among marginal s ea basins goes shallower southward, and it is similar to that of the Philippine Sea. Such a case means that strength of tectonic activities is almost the same in either side of the arc. The stress field from large scale of mantle convection is consistent with the southeastward rift of the Eurasian plate and the northwestward spread of the Pacific plate. Middle scale of mantle convection is closely related to the mantle plumes north of the Japan Sea and southwest of the South China Sea, and middle scale of mantle convection in the Philippine Sea has upgraded strength of the arc tectonic activities. Small scale of mantle convection restricted in asthenosphere diverges in sea basins, converges in Okinawa Trough and Mariana Trough, and it can be generally analogized with isostatic gravity anomaly. Features and relationships among large, middle and small scales of mantle convection systems are discussed to elucidate the geodynamic process of evolution of sea basins and troughs.关键词
卫星测高重力场/莫霍面/地幔流/地球动力学/西太平洋分类
海洋科学引用本文复制引用
金翔龙,高金耀..太平洋卫星测高重力场与地球动力学特征[J].海洋地质与第四纪地质,2001,21(1):1-6,6.基金项目
国家重点基础研究发展规划项目资助(G 2000046703) （G 2000046703）
