走滑断层震间形变GPS观测站点布设的合理性分析

GPS Observation Station Layout for the Analysis of Interseismic Deformation of Strike-slip Fault

针对单条断层合理布设GPS站点可准确反映断层形变状态。远场布设的有效距离与近场的布设间隔是影响断层运动分析结果的重要因素。远场有效距离为变形宽度的边界,其与断层闭锁深度之间的关系约为6.31倍;近场间隔利用分段折线近似替代断层震间形变曲线,根据形变曲线的变化特点将形变区域分区,得到"近场区"和"过渡区"与断层闭锁深度之间的关系。并且,对川滇块体东边界目前站点布设状态对结果可能的影响进行初步分析。研究结果可对今后GPS站点布设方案提供理论参考。

A reasonable GPS station layout for a single fault can accurately reflect the fault deformation state. The effective distance of far field and spacing of the near field are the important factors that affect observation result. The far-field effective distance should be 6.31 times the locking depth of the fault. The near-field interval is approximated by the segmented line, and the deformation area is divided according to the deformation curve, which is the relation between ＂near-field and transition zone＂ and the depth of fault loc king. As an example, we analyzed the possible impact of the current layout of the eastern boundary of the Sichuan-Yunnan block on the possible results. The conclusion can provide a theoretical reference for future GPS station deployment.