四川宜宾地壳浅部三维S波速度结构及方位各向异性

王金泽 李红谊 张玉婷 陈辛平 崔华伟

王金泽,李红谊,张玉婷,陈辛平,崔华伟. 2022. 四川宜宾地壳浅部三维S波速度结构及方位各向异性. 地震学报,44(2):271−285 doi: 10.11939/jass.20210132
引用本文: 王金泽,李红谊,张玉婷,陈辛平,崔华伟. 2022. 四川宜宾地壳浅部三维S波速度结构及方位各向异性. 地震学报,44(2):271−285 doi: 10.11939/jass.20210132
Wang J Z,Li H Y,Zhang Y T,Chen X P,Cui W H. 2022. Shallow shear wave velocity structure and azimuthal anisotropy in Yibin,Sichuan. Acta Seismologica Sinica,44(2):271−285 doi: 10.11939/jass.20210132
Citation: Wang J Z,Li H Y,Zhang Y T,Chen X P,Cui W H. 2022. Shallow shear wave velocity structure and azimuthal anisotropy in Yibin,Sichuan. Acta Seismologica Sinica44(2):271−285 doi: 10.11939/jass.20210132

四川宜宾地壳浅部三维S波速度结构及方位各向异性

doi: 10.11939/jass.20210132
基金项目: 上海佘山地球物理国家野外科学观测研究站开发基金(2020K02)资助
详细信息
    作者简介:

    王金泽,在读硕士研究生,主要从事背景噪声层析成像方面的研究,e-mail:1209284532@qq.com

    通讯作者:

    李红谊,博士,教授,主要从事地震学方面的研究,e-mail:lih@cugb.edu.cn

  • 中图分类号: P315.2

Shallow shear wave velocity structure and azimuthal anisotropy in Yibin,Sichuan

  • 摘要: 利用四川宜宾及周边地区布设的30个临时台站连续44天的波形记录,采用背景噪声互相关方法提取了周期为1—15 s的瑞雷面波相速度频散曲线,然后使用基于面波射线路径追踪的瑞雷面波直接成像方法得到0—10 km深度范围内三维S波速度模型,最后利用该模型作为初始模型采用相同的反演框架得到该地区的方位各向异性结构. 结果表明:浅层S波波速横向分布不均匀,随着深度增加呈不均一性减弱,在2 km深度左右,筠连—高县—珙县—长宁背斜一带的S波速度呈高速分布,可能与该区域地层经历褶皱、抬升和地表风化剥蚀有关;从5 km深度起,随着深度增加狮子滩—双河场—长宁背斜区域的S波速度在西北部较东南部相对较低,而低速的分布反映出区域内介质力学性质较弱,因此可能是2019年长宁地震序列沿近北西向破裂的原因之一。方位各向异性结果表明: 在孔滩背斜附近,快波方向与背斜走向近似平行,随着深度增加各向异性强度变弱,而且快波方向逐渐向北收敛向西南撒开,呈帚状分布;在区域地质构造作用、主压应力场等的共同影响下,局部区域的方位各向异性快波方向在不同深度处呈现出复杂的特征。

     

  • 图  1  四川宜宾地区构造及地震和台站分布

    Figure  1.  The topography of the Yibin area and distribution of earthquakes and stations

    图  2  1—15 s周期的台站对之间的互相关函数(a)和基阶瑞雷面波相速度频散曲线(b)

    Figure  2.  nterstation cross-correlation function (a) and The fundamental Rayleigh wave phase velocity dispersion curves (b) in the 1−15 s period

    图  3  基阶瑞雷面波相速度频散的深度敏感核

    Figure  3.  Depth sensitivity kernels for the fundamental Rayleigh wave phase velocity dispersion at different periods

    图  4  2 km (a)和6 km (b)深度处的横向和纵向剪切波速棋盘测试结果

    左图为初始模型,右图为对应的恢复结果。三角形为台站位置,灰色阴影为地形

    Figure  4.  Lateral and vertical shear-wave velocity checkerboard tests at the depths of 2 km (a) and 6 km (b)

    The left panels are the initial models and the right ones are the corresponding recovery results. The location of the station and topography are shown as triangle and gray shadow,respectively

    图  5  方位各向异性棋盘测试的输入(a)和输出(b)结果

    Figure  5.  Checkerboard tests input (a) and output (b) results of azimuthal anisotropy

    图  6  研究区内深度为2 km (a),4 km (b),6 km (c)和10 km (d)的三维S波速度结构

    Figure  6.  3D shear wave velocity structures at the depths of 2 km (a),4 km (b),6 km (c) and 10 km (d) beneath the study area

    图  8  不同深度范围的三维S波速度模型及方位各向异性

    Figure  8.  Three-dimensional shear wave speed model and corresponding azimuthal anisotropy in different depth ranges

    图  7  AA′和BB′剖面 0—10 km深度范围内的S波速度结构

    (a) 5 km深度的S波速度图像,其中黑线剖面位置;(b) AA′剖面;(c) BB′剖面

    Figure  7.  Shear wave structures of the profiles AA′ and BB′ in the depth range of 0−10 km

    (a) vS structure at the depth of 5 km,the black lines respent the location of profiles;(b) AA′ profile;(c) BB′ profile

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出版历程
  • 收稿日期:  2021-08-03
  • 修回日期:  2021-09-18
  • 网络出版日期:  2022-03-18
  • 刊出日期:  2022-04-24

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