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2006年12月26日台湾屏东地震机制的地球动力学成因探讨

, PP. 1301-1309

Keywords: 屏东地震,地震机制,有限元模拟,流变性质,地球动力学

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Abstract:

?2006年12月26日发生了屏东Mw7.0级强烈地震,之后Harvard,USGS和中国台湾的BATS分别对其进行了定位.不同来源的震源机制研究结果均认为该地震属于正断层地震,但震源深度定位差别很大.多数学者都支持本次地震震源深度为40~44km之间.为进一步探讨本次地震的地球动力学成因,根据上述结果,在详细计算相关参数后进行了二维有限元数值实验分析.结果表明屏东地震发生的主要动力学背景与成因为:由于弧-陆碰撞的作用使得台湾地区地壳部分整体处于北西-南东向压应力状态,但由于柔性下地壳的存在,使得上地壳变形与岩石圈地幔变形解耦,岩石圈地幔板片在弯曲俯冲的过程中,会在其上表面处于拉张状态从而形成正断层机制的地震.

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