Rotation change in the orientation of the centre-of-figure frame caused by large earthquakes
Rotation change in the orientation of the centre-of-figure frame caused by large earthquakes
复制标题
大地震引起的图形中心框架方向的旋转变化
DOI：
10.1093/gji/ggw182
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发表时间：
2016
影响因子：
2.8
通讯作者：
Xu Jianqiao
中科院分区：
文献类型：
--
作者：
Zhou Jiangcun;Sun Wenke;Jin Shuanggen;Sun Heping;Xu Jianqiao
首次提出了一种估算地震引起的中心框架方位旋转变化的方法。该方法涉及使用基于球形、非旋转、完全弹性和各向同性（SNREI）地球的点位错理论。方位的旋转变化仅与垂直倾向滑移位错引起的1度环向位移有关，而地震引起的球向位移没有贡献。研究了2004年苏门答腊地震和2011年东北隐岐地震这两次大地震的影响。结果表明，苏门答腊地震和东北冲地震都引起CF框架旋转至少几十μ s（微弧秒）。虽然可以识别出可见的同震位移并将其从坐标时间序列中去除，但由于未识别的同震位移和去除误差而引起的旋转变化是不可忽略的。因此，在今后的参考框架和大地测量应用中，应考虑地震变形引起的CF框架方向的旋转变化。
A method to estimate the rotation change in the orientation of the centre-of-figure (CF) frame caused by earthquakes is proposed for the first time. This method involves using the point dislocation theory based on a spherical, non-rotating, perfectly elastic and isotropic (SNREI) Earth. The rotation change in the orientation is related solely to the toroidal displacements of degree one induced by the vertical dip slip dislocation, and the spheroidal displacements induced by an earthquake have no contribution. The effects of two recent large earthquakes, the 2004 Sumatra and the 2011 Tohoku-Oki, are studied. Results showed that the Sumatra and Tohoku-Oki earthquakes both caused the CF frame to rotate by at least tens of μas (micro-arc-second). Although the visible co-seismic displacements are identified and removed from the coordinate time-series, the rotation change due to the unidentified ones and errors in removal is non-negligible. Therefore, the rotation change in the orientation of the CF frame due to seismic deformation should be taken into account in the future in reference frame and geodesy applications.