青藏高原东北缘中上地壳介质各向异性及其构造意义

钱旗伟, 吴晶, 刘庚, 沙成宁, 马建新, 白占孝, 赵燕杰, 刘小梅. 2017. 青藏高原东北缘中上地壳介质各向异性及其构造意义. 地球物理学报, 60(6): 2338-2349, doi: 10.6038/cjg20170625
引用本文: 钱旗伟, 吴晶, 刘庚, 沙成宁, 马建新, 白占孝, 赵燕杰, 刘小梅. 2017. 青藏高原东北缘中上地壳介质各向异性及其构造意义. 地球物理学报, 60(6): 2338-2349, doi: 10.6038/cjg20170625
QIAN Qi-Wei, WU Jing, LIU Geng, SHA Cheng-Ning, MA Jian-Xin, BAI Zhan-Xiao, ZHAO Yan-Jie, LIU Xiao-Mei. 2017. Anisotropy of middle-upper crust derived from shear-wave splitting in the northeastern Tibetan plateau and tectonic implications. Chinese Journal of Geophysics (in Chinese), 60(6): 2338-2349, doi: 10.6038/cjg20170625
Citation: QIAN Qi-Wei, WU Jing, LIU Geng, SHA Cheng-Ning, MA Jian-Xin, BAI Zhan-Xiao, ZHAO Yan-Jie, LIU Xiao-Mei. 2017. Anisotropy of middle-upper crust derived from shear-wave splitting in the northeastern Tibetan plateau and tectonic implications. Chinese Journal of Geophysics (in Chinese), 60(6): 2338-2349, doi: 10.6038/cjg20170625

青藏高原东北缘中上地壳介质各向异性及其构造意义

  • 基金项目:

    国家自然科学基金(41574055,41374064,41074037)、岩石圈演化国家重点实验室自主研究课题(11731210)与开放研究课题(81300001)、地震行业科研专项基金(201308011)联合资助

详细信息
    作者简介:

    钱旗伟, 男, 1991年生, 硕士研究生, 主要从事地震各向异性研究.E-mail:qianqiwei@mail.iggcas.ac.cn

    通讯作者: 吴晶, 女, 1977年生, 副研究员, 主要从事地震各向异性、断裂带结构与震源研究.E-mail:wujing_js@mail.iggcas.ac.cn
  • 中图分类号: P315

Anisotropy of middle-upper crust derived from shear-wave splitting in the northeastern Tibetan plateau and tectonic implications

More Information
  • 青藏高原东北缘(94°E—105°E,32°N—40°N)是高原北东向扩张的前沿地带,亦是研究高原生长过程的重要区域.本文利用青海省数字地震台网(2008—2014年)共7年的地震目录和波形数据,首先使用双差定位获取精定位震源位置,在此基础上,挑选位于S波窗口内(射线入射角≤45°)的地震事件,依据S波分裂分析方法(SAM),获取研究区域内共26个台站的S波分裂参数.研究结果表明:地处多个块体交汇部位的西宁及其周缘,地壳各向异性呈现两个优势偏振方向,表明该区中上地壳应力环境由区域主压应力场和活动断层共同约束;玉树地震序列的地壳各向异性优势偏振方向与区域主压应力场一致.

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  • 图 1 

    研究区域地质构造、断层和台站分布

    Figure 1. 

    Geological structures, faults and stations in the study area

    图 2 

    丛集2(玉树余震)定位前后震中位置分布对比

    Figure 2. 

    Comparison of epicenters in cluster 2(aftershocks of the Yushu earthquake)

    图 3 

    带通滤波(1~20 Hz)后地震事件三分向波形记录

    Figure 3. 

    Band-pass filtered (1~20 Hz) waveforms of seismic events in three directions

    图 4 

    S波分裂分析检验

    Figure 4. 

    Check of S-wave splitting analysis

    图 5 

    有效记录的震源深度分布

    Figure 5. 

    Focal depths of effective records

    图 6 

    研究区域内26个台站单台快波偏振方向等面积投影玫瑰图

    Figure 6. 

    Equal-area projection rose diagram of fast shear-wave polarizations beneath 26 stations in the study area

    图 7 

    研究区域内26个台站快波偏振方向等面积投影玫瑰图

    Figure 7. 

    Equal-area projection rose diagram of fast shear-wave polarizations beneath 26 stations in the study area

    图 8 

    研究区域内26个台站快波偏振方向空间分布图

    Figure 8. 

    Spatial distribution of fast shear-wave polarizations beneath 26 stations in the study area

  •  

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出版历程
收稿日期:  2016-12-23
修回日期:  2017-05-04
上线日期:  2017-06-05

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