基于地震参数的缅甸弧俯冲带处板块间几何接触方式的研究
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摘要
从全球板块系统来看,中国大陆周边板块活动是其地壳运动的主要外部力源,明确周边板块与中国大陆间较精细的三维几何接触方式对中国大陆动力学研究具有实际意义.本文首先基于研究区域地震活动参数,引用Hayes等在2009和2010年提出的Slab1.0模型,对其进行改造以适用于研究缅甸弧俯冲带处欧亚大陆与印度板块接触的几何产状.其次,沿缅甸弧俯冲边界带截取了166个剖面,依次考察各剖面的震源深度分布情况,对其进行线性平面与非线性曲面拟合,定量地给出了缅甸弧俯冲带东向俯冲的三维几何产状及俯冲范围.最后,针对缅甸弧俯冲带上6个典型剖面的震源深度分布情况,并联合震源机制解和地质构造背景讨论并初步给出了该俯冲带可能的动力作用模式.本文企望为研究中国大陆与周边板块边界几何接触方式提供一个初步方案,并为板块间的动力作用及相关地球动力学研究提供基础研究资料.
引文
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