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青海玉树MS7.1地震发震过程的数值模拟

王连捷 崔军文 王薇 乔子江 孙东生 赵卫华

王连捷, 崔军文, 王薇, 等, 2010. 青海玉树MS7.1地震发震过程的数值模拟. 地质力学学报, 16 (2): 137-145.
引用本文: 王连捷, 崔军文, 王薇, 等, 2010. 青海玉树MS7.1地震发震过程的数值模拟. 地质力学学报, 16 (2): 137-145.
WANG Lian-jie, CUI Jun-wen, WANG Wei, et al., 2010. NUMERICAL MODELING FOR MECHANISM OF YUSHU MS7.1 EARTHQUAKE. Journal of Geomechanics, 16 (2): 137-145.
Citation: WANG Lian-jie, CUI Jun-wen, WANG Wei, et al., 2010. NUMERICAL MODELING FOR MECHANISM OF YUSHU MS7.1 EARTHQUAKE. Journal of Geomechanics, 16 (2): 137-145.

青海玉树MS7.1地震发震过程的数值模拟

基金项目: 

国家“973”项目 2008CB425702

国土资源部深部探测技术与试验研究专项 SinoProbe-07

详细信息
    作者简介:

    王连捷(1933-), 男, 研究员, 从事地质灾害、地应力测量、应力场数值分析及应用研究。E-mail: wanglj01@sina.com

  • 中图分类号: P315.01

NUMERICAL MODELING FOR MECHANISM OF YUSHU MS7.1 EARTHQUAKE

  • 摘要: 根据玉树地区的地应力场、速度场和断层展布, 对青海玉树2010年4月14日MS7.1级地震发震机理进行了数值模拟。将围岩看成弹性体, 断层看成具有应变软化的弹塑性体, 断层和围岩组成统一的地质介质系统。在地应力、孔隙压力及边界位移的作用下, 应力逐渐积累, 当达到断层摩擦破坏强度时, 断层产生应变软化, 断层突然滑动, 能量突然释放, 应力突然下降, 形成地震。模拟结果表明:玉树7.1级地震是在印度板块向北推挤, 青藏高原向东南侧向挤压, 在玉树地区形成主压应力为北东80°方向的水平应力场, 使甘孜-玉树断裂带产生左旋走滑错动形成的。计算结果给出了应力降、能量释放量、断层走滑错动量、地震复发周期、应力积累速度等重要参数, 模拟结果与野外调查资料具有较好的一致性。

     

  • 图  1  玉树及周边地区的应力场

    Figure  1.  Stress field around the Yushu area

    图  2  玉树地震区及周边地区GPS速度场

    (据赖锡安等[19])

    Figure  2.  Velocity field by GPS around the Yushu area

    图  3  计算模型

    a-模型的平面图; b-模型的三维图; D-模型宽度; L-模型长度; H-模型深度; σH-最大水平主应力; σh-最小水平主应力; v-速度; p-孔隙压力

    Figure  3.  Model for calculationa

    图  4  模型网格(红线为断层面)

    Figure  4.  Mesh of model(red is fault plane)

    图  5  地震时断层的突然走向滑动(监测点为图 8 a点)

    Figure  5.  Sudden sliding of faultwhen the earthquake happened

    图  6  地震时的能量释放

    Figure  6.  Energy density curvewhen the earthquake happened

    图  7  地震应力降

    Figure  7.  Stress drop for the earthquake

    图  8  地震引起的沿断层走向的位移/m

    (a点为位移监测点)

    Figure  8.  Fault displacement along strike caused by the earthquake

    图  9  断层两侧位移分布

    Figure  9.  The displacements on both sides of fault

    表  1  断层和围岩参数

    Table  1.   Parameters of fault and surroundings

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  • 收稿日期:  2010-05-25
  • 刊出日期:  2010-06-28

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