台湾海峡及邻区地球物理特征及地壳密度结构

Geophysical Characteristic and Density Structure of Crust in Taiwan Strait and Neighboring Area

本文对台湾海峡及邻区的岩石物理性质和重力、磁力异常进行了分析研究。在此基础上,利用地震资料进行约束,对过台湾岛中部和南部恒春半岛的两条重力剖面进行了定量计算,并对建立的地壳密度结构进行了分析。研究表明,在台湾岛中部,欧亚大陆板块与菲律宾海板块碰撞,导致地壳增厚的模型更为符合迄今为止的地球物理探测结果。而台湾岛南部的地壳密度结构揭示了,属于欧亚大陆的南海板块向菲律宾海板块下俯冲的地壳密度分布。

The rock physical characteristics and gravity and magnetic anomaly in Taiwan strait and neighboring area has been studied in this paper. Under the restrictions of deep seismic data gravity anomalies of two profiles across central and south part of Taiwan island are calculated. The results show that the model of crust thicken across central part of Taiwan island accords with the data of geophysical prospecting, resulting from collision between Eurasia plan and Philippine blocks. The density distribution of crust in southern Taiwan has been showed, during South China Sea block nosing down Philippine block.