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    三维复杂速度结构中深发地震的双差分定位

    江国明 赵大鹏 张贵宾

    江国明, 赵大鹏, 张贵宾, 2009. 三维复杂速度结构中深发地震的双差分定位. 地球科学, 34(6): 1001-1011.
    引用本文: 江国明, 赵大鹏, 张贵宾, 2009. 三维复杂速度结构中深发地震的双差分定位. 地球科学, 34(6): 1001-1011.
    JIANG Guo-ming, ZHAO Da-peng, ZHANG Gui-bin, 2009. Locating Deep Earthquakes in Complex 3-D Velocity Structure Using a Modified Double-Difference Location Method. Earth Science, 34(6): 1001-1011.
    Citation: JIANG Guo-ming, ZHAO Da-peng, ZHANG Gui-bin, 2009. Locating Deep Earthquakes in Complex 3-D Velocity Structure Using a Modified Double-Difference Location Method. Earth Science, 34(6): 1001-1011.

    三维复杂速度结构中深发地震的双差分定位

    基金项目: 

    地下信息探测技术与仪器教育部重点实验室开放课题项目 GDL0806

    “863”计划重大项目 2006AA06A202

    “863”计划重大项目 2006AA06A203

    详细信息
      作者简介:

      江国明(1979—),博士,主要从事天然地震层析成像方面的研究. E-mail:jiang_guoming@cugb.edu.cn

    • 中图分类号: P631

    Locating Deep Earthquakes in Complex 3-D Velocity Structure Using a Modified Double-Difference Location Method

    • 摘要: 双差分地震定位法采用了一维射线追踪法和直角坐标系, 不适合于复杂速度模型中的地震定位.本研究采用三维射线追踪技术和球坐标系改进了双差分定位法, 扩大了它的应用范围.为了检验新方法的可行性和准确性, 以日本海地区下方的深发地震为研究对象, 通过对比4种复杂速度模型中双差分定位结果, 分析速度结构对双差分定位的影响.结果表明, 改进后的双差分定位法受速度结构变化的影响较小, 而且当震源区的速度模型越接近真实速度结构时, 定位结果的精度越高, 这为利用深发地震研究地球深部构造奠定了基础.

       

    • 图  1  球坐标系及震源扰动示意图

      空心五角星表示某一深发震源的位置.纬度、经度和深度的单位分别为rad和km.θ表示震源的纬度

      Fig.  1.  A hypocenter perturbation in the spherical coordinates

      图  2  震中和地震观测台站位置分布

      a.空心圆圈和黑色正方形分别代表78个深发地震的震中和816个地震观测台站; 等深线代表太平洋俯冲板块的上边界深度, km (Zhao et al., 1997); b.横坐标表示震源位置相对于板块上边界的距离, 纵坐标表示震源深度

      Fig.  2.  Distribution of epicenters and seismic stations used in this study

      图  3  J-B速度模型和三维速度模型纵剖面示意图

      a.3条虚线自上而下分别代表康氏面、莫霍面和~410 km间断面; b.白色箭头表示太平洋板块俯冲的方向

      Fig.  3.  1-D J-B velocity model and 3-D velocity model in the vertical direction

      图  4  阻尼系数折中曲线图

      Fig.  4.  Trade-off curve of determining the optimal damping parameter (arrow)

      图  5  定位次数与走时残差均方根之间的关系

      Fig.  5.  Number of earthquake relocation versus the root-mean-square (RMS) travel-time residual

      图  6  震源参数随定位次数的变化情况

      左图和右图分别表示定位后的震源相对于Enew的发震时刻和空间位置的变化, 每个柱状图中, 每条“柱”的宽度分别为0.1 s (发震时刻变化量) 和1 km (震源位置变化量), 即横坐标, 而高度则表示在每个分段内的地震个数占总数的百分比, 即纵坐标.右侧的60%表示每个子图中纵坐标的最大值, 而最小值默认为0%

      Fig.  6.  Changes in hypocenter parameters with the iteration number of earthquake relocations

      图  7  在模型1中每个震源定位前后的对比

      a.纬度方向; b.经度方向; c.深度方向; d.空间距离; e.发震时刻; 空心圆圈和五角星分别代表78个深发地震定位前和定位后的位置及发震时刻与Enew之间的偏差

      Fig.  7.  Comparison of each hypocenter parameter before and after relocation in Model 1

      图  8  不同速度模型中的定位结果对比柱状

      CT和DD分别代表常规定位和双差分定位.左图和右图分别表示定位后的震源相对于Enew的发震时刻和空间位置的变化

      Fig.  8.  Histogram of relocated hypocenters in different velocity models

      表  1  不同速度模型中的速度扰动值

      Table  1.   Velocity perturbation (in %) in different velocity models (see text for details)

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    • 收稿日期:  2009-06-10
    • 刊出日期:  2009-11-25

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