Seismological Study of the Upper Mantle Transition Zone Associated with Western Pacific Subduction Zones

本研究是对菲律宾海、日本海、黄海、东中国海、渤海一带俯冲板块内部及周围上地幔过渡带结构研究的继续。在日本地区，停滞不前或被压扁的板块似乎比早期的断层扫描研究显示的要小。过渡区内的横向差异似乎很大。这些结果是通过一维建模获得的，因此具有一定的局限性。目前的研究将利用二维有限差分格式来改进建模。这项工作是与东京大学地震研究所(ERI)的科学家合作进行的。这项短波长工作将与东京大学的大尺度结果相结合，为西太平洋提供更准确的上地幔过渡带模式。这些结果将对垂直对流模式跨越过渡区边界的约束具有重要意义。

9805006TajimaThis research is a continuation of an investigation of the upper-mantle transition-zone structure in and around subducting slabs around the Philippine Sea, Japan Sea, Yellow Sea, East China Sea and Bohai Sea. In the Japan region, the stagnant, or flattened, slab appears to be smaller than earlier tomographic studies would suggest. Lateral variations within the transition zone appear to be substantial. These results were obtained by means of 1-D modeling, and therefore are somewhat limited. The current research will utilize a 2-D finite difference scheme to improve the modeling. The work is carried out in collaboration with scientists at the Earthquake Research Institute (ERI) at the University of Tokyo. This short-wave-length work will be combined with the large-scale results from the University of Tokyo to provide a more accurate upper mantle transition zone model for the western Pacific. These results will be important for the constraint of vertical convection models across the transition zone boundaries.