利用精密水准资料研究西秦岭北缘断裂带的垂向运动特征  

Vertical Movement Characteristics of the Northern Margin Fault of Western Qinling Mountains Using Precise Leveling Data

作　　者：赵勃 季灵运[1] 郝明[1] 邱江涛[1] 朱良玉[1] 蒋锋云[1] 刘雷 ZHAO Bo;JI Lingyun;HAO Ming;QIU Jiangtao;ZHU Liangyu;JIANG Fengyun;LIU Lei(The Second Monitoring and Application Center,CEA,316 Xiying Road,Xi’an 710054,China)

机构地区：[1]中国地震局第二监测中心,西安市710054

出　　处：《大地测量与地球动力学》2025年第4期426-430,435,共6页Journal of Geodesy and Geodynamics

基　　金：陕西省自然科学基础研究计划(2023-JC-QN-0324,2023-JC-QN-0296,2023-JC-YB-260)。

摘　　要：利用精密水准测量数据,结合改进的倾滑位移模型,系统分析西秦岭北缘断裂带各区段的垂向运动特征。结果表明,西秦岭北缘断裂带正经历左旋走滑与逆冲挤压的复合变形机制,且不同区段的活动性存在显著差异。垂向倾滑速率呈现从西段的0.24 mm/a向东增大到2.31 mm/a后,又减小到1.51 mm/a的空间变化趋势。通过反演获得的闭锁深度与地震精定位所揭示的小震活动深度高度吻合,说明该断裂带各区段处于不同的闭锁状态。结合地震活动性发现,天水-宝鸡段发震危险性最紧迫。Using precise leveling measurement data and a modified dip-slip displacement model,we systematic analyze the vertical movement characteristics of each section of the northern margin fault of western Qinling mountains.The results show that the northern margin fault of western Qinling mountains is undergoing a composite deformation mechanism of left-lateral strike-slip and thrust compression,and the activity varies among different sections.The vertical dip-slip rate increase from 0.24 mm/a in the western section to a maximum of 2.31 mm/a in the eastern section,and then decrease to 1.51 mm/a.The inverted locking depths are consistent with the relocation depths of small earthquakes,which indicates that there are different locking states in each section.Combining seismic activity,the Tianshui-Baoji section has the highest earthquake risk.

关 键 词：西秦岭北缘断裂带 精密水准 倾滑速率 闭锁深度 

分 类 号：P313[天文地球—固体地球物理学] P315[天文地球—地球物理学]