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汉中盆地及邻区地壳结构和如何登录365bet_365bet官网备用网址_365bet体育在线世爵活动性研究

危自根 ,? 储日升 ,? 杨小林 ,? 谢军 ,? 田忠华 ,? 凌媛 ,? 董非非

引用本文: 危自根,?储日升,?杨小林,?谢军,?田忠华,?凌媛,?董非非. 2019.?汉中盆地及邻区地壳结构和如何登录365bet_365bet官网备用网址_365bet体育在线世爵活动性研究.?如何登录365bet_365bet官网备用网址_365bet体育在线世爵学报,?41(4):?445-458. doi: 10.11939/jass.20180145 shu
Citation:? Wei Zigen,?Chu Risheng,?Yang Xiaolin,?Xie Jun,?Tian Zhonghua,?Ling Yuan,?Dong Feifei. 2019.?Crustal structure and seismic activity in the Hanzhong basin and its adjacent areas.?Acta Seismologica Sinica,?41(4):?445-458. doi: 10.11939/jass.20180145 shu

汉中盆地及邻区地壳结构和如何登录365bet_365bet官网备用网址_365bet体育在线世爵活动性研究

    通讯作者: 储日升, chur@asch.whigg.ac.cn
摘要: 为了进一步探查汉中盆地的深部动力学机制和孕震构造特征,本文基于背景噪声成像、多频接收函数和面波联合反演以及莫霍面Ps震相时深转换方法反演了汉中盆地及其邻区的地壳S波速度和厚度,并进一步对比分析了研究区深部结构与如何登录365bet_365bet官网备用网址_365bet体育在线世爵活动性之间的关系。结果表明:汉中盆地不同区域的浅表沉积厚度和速度存在差异;部分区域莫霍面处的速度变化平缓,Ps震相与P震相的振幅比<0.2;汉中盆地内部鲜有如何登录365bet_365bet官网备用网址_365bet体育在线世爵发生,其周边10 km范围内如何登录365bet_365bet官网备用网址_365bet体育在线世爵分布主要受到断层控制;4—16 km震源深度上下界面大致对应于低速体底层和高速体顶层。本文获得的非均匀分布的沉积厚度、渐变的壳幔过渡带结构与汉中盆地长期处于秦岭构造带、大巴山褶皱带以及青藏地块交界区的三联点构造位置密切相关。

English

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  • 图?1? 汉中盆地及其邻区地质构造背景(邓起东等,2002) (a)以及2009年以来的如何登录365bet_365bet官网备用网址_365bet体育在线世爵和台站分布(b)

    Figure?1.? Regional geological tectonic settings (Deng et al,2003) (a) and distribution of earthquakes since 2009 and stations (b) in the Hanzhong basin and its adjacent regions

    图?2? 典型台站对垂直分量波形之间的互相关函数(a),邻域算法反演结果(b),群速度频散曲线(c,黄色线条所示)及其拟合结果(d)

    Figure?2.? Vertical-component cross-correlation functions (a),neighborhood algorithm inversion results (b),group velocity dispersion measurement denoted by the yellow curve (c) and the fitting of group velocity dispersion curves (d) for typical station-pairs

    图?3? 汉中盆地及其邻区浅层频散曲线路径覆盖(a)和不同深度hS波速度分布(b?f)

    Figure?3.? Path coverage of dispersion curves (a) and distribution of S-wave velocity at different depths h (b?f) in the Hanzhong basin and its surrounding areas

    图?4? 多频接收函数及面波频散联合反演示例图

    Figure?4.? The schematic diagrams for the joint inversion of multi-frequency receiver function and surface wave dispersion

    图?5? 16个台站远震接收函数叠加后的前8 s波形(a)和两个典型台站S22 (b)和LUYA (c)叠加前的接收函数波形

    Figure?5.? The stacked teleseismic receiver functions from ?1 s to 8 s for 16 stations (a)and original receiver functions for two typical stations S22 (b) 和LUYA (c)

    图?6? 汉中盆地及其邻区地形(a)和地壳厚度(b)

    Figure?6.? Topography (a) and crustal thickness (b) in Hanzhong basin and its adjacent areas

    图?7? 2009年1月1日至2018年9月1日汉中盆地及其周边10 km范围内的如何登录365bet_365bet官网备用网址_365bet体育在线世爵分布(a)及最大震级统计分析(b)

    Figure?7.? Distribution of the earthquakes in the Hanzhong basin and its surrounding areas (<10 km) from 1 January 2009 to 1 September 2018 (a) and statistic on corresponding maximum magnitude (b)

    图?8? 研究区E?W (a)和WS?EN (b)方向两条典型剖面(位置见图7)下方的地壳S波速度和如何登录365bet_365bet官网备用网址_365bet体育在线世爵分布(虚线表示从图6中提取的地壳厚度)

    Figure?8.? Distribution of the crustal S-wave velocity and earthquakes beneath the profiles (Fig. 7) in E?W (a) and WS?EN (b) directions,where dashed lines show the crustal thickness extracted from Fig. 6

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  • 通讯作者:? 储日升, chur@asch.whigg.ac.cn
  • 收稿日期:? 2018-12-17
  • 录用日期:? 2019-01-29
  • 网络出版日期:? 2019-07-01
通讯作者: 陈斌, bchen63@163.com
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