南北地震带区域构造应力场反演

崔子健 陈章立 王勤彩 李君

崔子健, 陈章立, 王勤彩, 李君. 2019: 南北地震带区域构造应力场反演. 地震学报, 41(2): 219-229. doi: 10.11939/jass.20180073
引用本文: 崔子健, 陈章立, 王勤彩, 李君. 2019: 南北地震带区域构造应力场反演. 地震学报, 41(2): 219-229. doi: 10.11939/jass.20180073
Cui Zijian, Chen Zhangli, Wang Qincai, Li Jun. 2019: Inversion for regional tectonic stress field in the North-South Seismic Belt of China. Acta Seismologica Sinica, 41(2): 219-229. doi: 10.11939/jass.20180073
Citation: Cui Zijian, Chen Zhangli, Wang Qincai, Li Jun. 2019: Inversion for regional tectonic stress field in the North-South Seismic Belt of China. Acta Seismologica Sinica, 41(2): 219-229. doi: 10.11939/jass.20180073

南北地震带区域构造应力场反演

doi: 10.11939/jass.20180073
基金项目: 中国地震局地震预测研究所基本科研业务费专项(2017IES0201,2018IEF010203)资助
详细信息
    通讯作者:

    崔子健,e-mail:c_z_j@163.com

  • 中图分类号: P315.727

Inversion for regional tectonic stress field in the North-South Seismic Belt of China

  • 摘要: 利用区域应力张量阻尼方法,使用南北地震带及其邻近区域2009年1月—2017年8月466次ML≥3.5地震的震源机制解,及1976年1月—2017年8月GCMT公布的259次M≥4.5地震的震源机制解,反演得到研究区1.0°×1.0°网格大小区域的构造应力场。应力场空间分布特征显示,南北地震带作为青藏高原的东边界,由于所处动力环境复杂,其内部最大主应力方向具有明显的空间差异性。这种差异主要表现为:南北地震带北段最大主应力方向为NE向;南北地震带中段及周边除龙门山断裂带NE段最大主应力为NW-NNW向外,其它地段最大主应力近EW向;南北地震带中南段最大主应力方向逐渐由近EW向到NW或NE向,再到近NS向。整体而言,南北地震带及邻近区域最大主应力方向由北到南发生了顺时针旋转。川滇菱形块体内部最大主应力方向为NNW向,应力方向转换带与块体边界基本一致,其东边界以东最大主应力方向为NW向,西边界以西为NNE向。从区域构造应力场的角度分析,难以将“南北地震带”作为一个统一的地震带应用于中长期地震预测的研究与实践中。

     

  • 图  1  本研究所用震源机制解空间分布图

    Figure  1.  Spatial distribution of the focal mechanism solutions used in this study

    图  2  南北地震带震源机制解P (a),T (b)轴分布图

    Figure  2.  P axes (a) and T axes (b) of focal mechanism solutions in North-South Seismic Belt

    图  3  模型长度与数据方差拟合曲线图

    Figure  3.  Fitting curve between model length and data variance

    图  4  南北地震带应力场反演结果空间分布图

    (a) 最大主应力;(b) 最小主应力

    Figure  4.  Spatial distribution of the inverted stress field in North-South Seismic Belt of China

    (a) The maximum principal stress orientation;(b) The minimum principal stress orientation

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出版历程
  • 收稿日期:  2018-06-04
  • 修回日期:  2018-10-31
  • 网络出版日期:  2019-01-31
  • 刊出日期:  2019-03-01

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