| 西秦岭北缘断裂分段运动变形特征分析 |
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| 引用本文： | 陈长云,贺建明.西秦岭北缘断裂分段运动变形特征分析[J].大地测量与地球动力学,2016,36(9):784-788. |
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| 作者姓名： | 陈长云 贺建明 |
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| 摘 要： | 利用1999~2007年和2009~2013年西秦岭北缘断裂及其邻区的GPS观测数据，基于跨断层速度剖面，结合断裂带邻区应变率场的分布，综合分析断裂带的分段运动变形特征。1999~2007年观测结果表明，西秦岭北缘断裂各次级断裂段均表现出左旋走滑兼挤压的运动特征，其中锅麻滩段的活动性明显高于其他3条次级断裂；GPS主应变率场显示，沿西秦岭北缘断裂，各次级断裂所受主压应变的方向基本一致，均为NE向，但是各分段主压应变的量值变化较为明显，锅麻滩段和鸳凤段所受主压应变明显大于漳县段和天水-宝鸡段；主压应变所表现出的分段特征与跨断裂GPS站点剖面反映的结果比较一致。2009~2013年观测结果表明，漳县段滑动速率增加，主张应变率增大，可能与岷县漳县地震的发生有关。综合分析跨断层剖面和主应变率场反映的断裂带远场和近场变形特征认为，西秦岭北缘断裂4条次级断裂已处于闭锁状态，并且存在一定的应变积累，其中天水-宝鸡段平行断裂滑动速率和垂直断裂的挤压速率均较低，可能表明其在西秦岭北缘断裂4条次级断裂中闭锁程度最高。
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| 关 键 词： | 西秦岭北缘断裂 地壳形变 速度场 应变率场 闭锁深度 |
Analysis of the Motion and Deformation Characteristics of Subordinary Segments of the West Qinling Fault |
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| CHEN Changyun,HE Jianming.Analysis of the Motion and Deformation Characteristics of Subordinary Segments of the West Qinling Fault[J].Journal of Geodesy and Geodynamics,2016,36(9):784-788. |
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| Authors: | CHEN Changyun HE Jianming |
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| Abstract: | Based on GPS horizontal velocity data from 1999-2007 and 2009-2013, mainly from the crustal motion observation network of China(COMMON), using the GPS velocity profiles, and combing with the principal strain rate field near the west Qinling fault, this paper analyzes the motion and deformation along different segments of the west Qinling fault. The results show that from 1999-2007, the characteristic of the whole fault is left strike slip with compression; among all four segments, the Guomatan has the highest activity, and the Tianshui-Baoji segment has the lowest. The principal strain rate along the whole west Qinling fault derived from GPS measurements shows that the principal compression strain rates are apparently greater than the principal strain rates. However, strain rate values are obviously different: the compression strain rate of the Guomatan and Yuanfeng segments are greater than the Zhangxian and Tianshui-Baoji segments. Compared to data from 1999-2007, the results during 2009-2013 show that the Zhangxian segment becomes more active, and has a relatively large tensile strain rate. These changes in the Zhangxian segment maybe caused by the Minxian-Zhangxian MS6.6 earthquake on July 22, 2013. The characteristics of principal strain rate of all segments of the west Qinling fault are the same as the results derived from the GPS velocity profiles. After comprehensive analysis of the remote and near field deformation characteristics acquired by the GPS velocity profiles and GPS principal strain rate field, we find that the whole west Qinling fault may be in a locked state, showing strain accumulation to a certain extent; among the four segments, the Tianshui-Baoji segment has the lowest activity, and this feature may show that this segment is at the highest locked state. |
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| Keywords: | west Qinling fault crustal deformation velocity filed strain rate filed locking depth |
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