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从同震和震后形变分析1668年M8.5级郯城地震对周边地震活动性的影响

徐昊 孙玉军 吴中海

徐昊, 孙玉军, 吴中海, 2016. 从同震和震后形变分析1668年M8.5级郯城地震对周边地震活动性的影响. 地质力学学报, 22 (3): 568-576.
引用本文: 徐昊, 孙玉军, 吴中海, 2016. 从同震和震后形变分析1668年M8.5级郯城地震对周边地震活动性的影响. 地质力学学报, 22 (3): 568-576.
XU Hao, SUN Yu-jun, WU Zhong-hai, 2016. THE EFFECT OF 1668 TANCHENG M8.5 EARTHQUAKE ON THE SEISMIC ACTIVITY OF THE VICINITY FROM COSEISMIC AND POSTSEISMIC DEFORMATION. Journal of Geomechanics, 22 (3): 568-576.
Citation: XU Hao, SUN Yu-jun, WU Zhong-hai, 2016. THE EFFECT OF 1668 TANCHENG M8.5 EARTHQUAKE ON THE SEISMIC ACTIVITY OF THE VICINITY FROM COSEISMIC AND POSTSEISMIC DEFORMATION. Journal of Geomechanics, 22 (3): 568-576.

从同震和震后形变分析1668年M8.5级郯城地震对周边地震活动性的影响

基金项目: 

中国地质调查局地质调查项目“长江经济带活动构造与区域地壳稳定性调查” DD20160268

详细信息
    作者简介:

    徐昊(1993-), 男, 硕士研究生, 研究方向地球动力学。E-mail:xhdky2011@163.com

    通讯作者:

    孙玉军(1983-), 男, 博士, 副研究员, 主要从事地球动力学方面的研究。E-mail:sunyujunabc@163.com

  • 中图分类号: P315.5

THE EFFECT OF 1668 TANCHENG M8.5 EARTHQUAKE ON THE SEISMIC ACTIVITY OF THE VICINITY FROM COSEISMIC AND POSTSEISMIC DEFORMATION

  • 摘要: 以山东郯城1668年大地震为例,以前人地表地质调查结果为约束,利用弹性位错理论初步获取了该地震的同震破裂模型;在此基础上,基于粘弹性分层模型分析了该地震的同震和震后形变,同时以主震断层为接收断层计算了库仑应力分布,进一步讨论了地幔不同粘滞性系数对地表形变和库仑应力变化的影响。计算结果显示,该地震是一个右旋走滑为主兼有一定逆冲性质的地震,其同震位移巨大,能量释放较彻底;同震破裂造成震中郯城县西北、东北和南部部分断层库仑应力增加,而震后形变使得这些断层库仑应力进一步增加,在单县、宿迁和日照等地,地震后350 a库仑应力变化量达到+1bar-+1MPa量级;地幔粘滞性系数不同,形变量和库仑应力变化达到稳定的时间不同,但最终趋于稳定的数值基本一致。

     

  • 图  1  研究区构造背景图(椭圆内加粗断裂为此次地震主震断层)

    Figure  1.  Tectonic background map of Tanlu fault and its surrounding regions

    图  2  同震及震后0 km处地表形变量

    a—同震时刻地表水平方向形变量;b—同震时刻地表垂直方向形变量(向上为正);c—350 a后地表水平方向形变量;d—350 a后地表垂直方向形变量(向上为正)

    Figure  2.  The coseismic and postseismic deformation of the surface

    图  3  同震库仑应力变化分布图(灰色圆圈为1668年郯城地震后至今研究区内发生的M1—M7地震事件)

    a—地表处同震库仑应力变化分布;b—20 km深处同震库仑应力变化分布;c—地表处震后350 a库仑应力变化分布;d—20 km深处震后350 a库仑应力变化分布

    Figure  3.  The distribution map of coseismic Coulomb stress change

    图  4  研究区内不同城市震后350 a内形变量和库仑应力变化

    a—南京市;b—日照市;c—宿迁市;d—单县市△CFS—库仑应力变化量;U(x)—南北向位移(北方向为正);U(y)—东西向位移(东方向为正);U(z)—垂向位移(向上为正)

    Figure  4.  Deformation and Coulomb stress change in different cities in study regions 350 years after the earthquake

    图  5  不同地幔粘滞性系数对应的震后形变和库仑应力变化(南京市)

    Figure  5.  The postseismic deformation and Coulomb stress change of different mantle viscosities(Nanjing)

    表  1  分层模型及参数

    Table  1.   Parameters of the multilayer crustal model

    序号深度范围/kmP波速度/(km·s-1)S波速度/(km·s-1)密度/(kg·m-3)粘滞系数/(Pa·s)
    10~105.002.892100
    210~156.163.562500
    315~206.203.582800
    420~306.353.672850
    530~356.323.6629501.0×1018
    635~406.503.7630001.0×1018
    7>408.184.7331001.0×1018
    下载: 导出CSV
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  • 收稿日期:  2016-04-24
  • 刊出日期:  2016-09-01

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