西沙地块海底地震仪转换横波的数据处理与震相识别

张浩宇, 丘学林, 王强, 黄海波, 赵明辉. 2021. 西沙地块海底地震仪转换横波的数据处理与震相识别. 地球物理学报, 64(11): 4090-4104, doi: 10.6038/cjg2021O0293
引用本文: 张浩宇, 丘学林, 王强, 黄海波, 赵明辉. 2021. 西沙地块海底地震仪转换横波的数据处理与震相识别. 地球物理学报, 64(11): 4090-4104, doi: 10.6038/cjg2021O0293
ZHANG HaoYu, QIU XueLin, WANG Qiang, HUANG HaiBo, ZHAO MingHui. 2021. Data processing and seismic phase identification of OBS converted shear wave in the Xisha Block. Chinese Journal of Geophysics (in Chinese), 64(11): 4090-4104, doi: 10.6038/cjg2021O0293
Citation: ZHANG HaoYu, QIU XueLin, WANG Qiang, HUANG HaiBo, ZHAO MingHui. 2021. Data processing and seismic phase identification of OBS converted shear wave in the Xisha Block. Chinese Journal of Geophysics (in Chinese), 64(11): 4090-4104, doi: 10.6038/cjg2021O0293

西沙地块海底地震仪转换横波的数据处理与震相识别

  • 基金项目:

    国家自然科学基金(41674092,41676045,41730532,42106082,91958212),国家重点研发计划(2018YFC0309800),南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0204)联合资助

详细信息
    作者简介:

    张浩宇, 男, 1995年生, 博士, 研究方向为海洋地球物理.E-mail: zhanghy435.swty@sinopec.com

    通讯作者: 丘学林, 男, 1964年生, 博士, 研究员, 研究方向为海洋地球物理.E-mail: xlqiu@scsio.ac.cn
  • 中图分类号: P738

Data processing and seismic phase identification of OBS converted shear wave in the Xisha Block

More Information
  • 主动源海底地震仪(OBS)转换横波震相的分析和模拟,能够从泊松比的角度更准确地约束地下结构和物质组成,有助于地壳精细结构和构造属性的研究.本文对南海北部陆缘西沙地块的OBS2013-3测线进行了转换横波数据处理和分析,通过能量扫描法求取极化角,并对OBS水平分量数据进行旋转,获取了径向分量数据.结合本测线的地质情况,求解佐布里兹(Zoeppritz)方程,得到了不同转换模式的能量分配关系,定量地指示了沉积基底和海底面为主导的P-S转换界面,Moho面为次一级转换界面.在OBS2013-3测线的各个台站径向分量地震剖面上识别出了一系列PPS和PSS型转换震相,最大偏移距达到130km,并进行了初步的正演模拟试算和验证.结合本测线实际情况,对OBS转换横波研究的基础问题进行了探讨.这些工作为后续的二维横波速度结构和泊松比结构模拟、物质组成和地壳属性分析打下了坚实的基础,为研究方法的进一步完善提供思路.

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  • 图 1 

    西沙海域海底地形与OBS2013-3测线位置图

    Figure 1. 

    Bathymetric and topographic map of Xisha area, showing location of OBS2013-3

    图 2 

    OBS主动源探测地震波P-S转换模式示意图

    Figure 2. 

    Schematic diagrams of P-S wave conversion in active-source OBS prospecting

    图 3 

    罗盘角校正前后分量旋转效果对比(以OBS11台站径向分量为例)

    Figure 3. 

    Comparison between component rotations using recorded and calculated compass angle (take the radial component of OBS11 as an example)

    图 4 

    OBS06台站第3158道(偏移距约20km)质点运动轨迹对比

    Figure 4. 

    Particle motion comparison of seismic trace 3158 in OBS06

    图 5 

    基于Zoeppritz方程计算的转换波反射、透射系数分布

    Figure 5. 

    Plots on amplitude coefficients of reflective and transmissive converted waves based on Zoeppritz equations

    图 6 

    OBS11台站转换S波PPS型震相识别与射线追踪

    Figure 6. 

    Identification and ray-tracing of PPS type converted S-wave seismic phases in OBS11

    图 7 

    OBS11台站转换S波PSS型震相识别与射线追踪

    Figure 7. 

    Identification and ray-tracing of PSS type converted S-wave seismic phases in OBS11

    图 8 

    OBS2013-3测线识别的主要转换S波震相

    Figure 8. 

    Main converted S-wave seismic phases identified in OBS2013-3

    图 9 

    OBS2013-3测线下方的S波速度结构

    Figure 9. 

    Shear-wave velocity structure beneath OBS2013-3

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出版历程
收稿日期:  2020-08-05
修回日期:  2021-05-27
上线日期:  2021-11-10

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