The Distribution Characteristics And The Relationship Between The Tectonic Units Of The Moho Depth In South China Sea And Adjacent Areas

For the purpose of studying the distribution characteristics of Moho and its relation with the tectonic units such as marginal basins, trenchs, island arcs and cenozoic sedimentary basins in South China Sea and adjacent areas, we firstly do the complete Bouguer correction for the spatial gravity anomaly and get the Bouguer gravity anomaly of the study area. Then, we obtain the Moho depth and the crustal thickness of the study area used the method of 3D interface inversion with the control points which are from the achievements of sonobuoy measurement and OBS profiles in recent years. In this paper, we summarizes the relief, trend, gradient of Moho and crustal nature in the study area by the statistical analysis for the known seismic profiles and 9 profiles planed by us. Finally, we draw the diagram of the trench, island arc, back-arc basin system in the study area. The results of the studies are important to further research of tectonic characteristics, oil and gas prediction, lithosphere and geological and geophysical survey.