劉家瑄2006-08-232018-06-282006-08-232018-06-281999http://ntur.lib.ntu.edu.tw//handle/246246/29299This research project investigates the crustal structures and tectonic features in the area offshore eastern Taiwan for the purposes of providing basic geological and tectonic framework for the Taiwan ocean drilling proposal, as well as to provide observational constraints on the geometry of the plate boundary between the Philippine Sea and Eurasia plates along the Taiwan subduction-collision zone. This report summarizes the results of the 2nd year study. During this year, main efforts were devoted on compiling and analyzing the geophysical data (especially the bathymetry and seismic reflection data) acquired previously, and scientific results on four different topics have been presented. A 500-m gridded digital bathymetric data set has been compiled that reveals details of the seafloor topography around Taiwan. The relationships between the bathymetric features and their tectonic implications have been discussed. For the study offshore eastern Taiwan, two papers have been published. One 2 discusses the kinematic movements of the southern Ryukyu Arc relative to Taiwan, and presents their geodynamic implications; the other paper reveals trench-parallel stretching and folding of the Ryukyu forearc basins due to oblique convergence of the plate motion. The last paper focused on the deformation of the Philippine Sea plate in the Taiwan collision zone, and proposes two possible mechanisms to accommodate the *subduction on one side and collision on the other side* geometry of the Philippine Sea plate.application/pdf34221 bytesapplication/pdfzh-TW國立臺灣大學海洋研究所Digital bathymetric dataRyukyu subduction - Taiwan collision systemForearc basin structureHuatung Basinreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/29299/1/882611M002024ODP.pdf