压扭性断裂的震前应力场与地应力变化异常

张超

张超. 1983: 压扭性断裂的震前应力场与地应力变化异常. 地震学报, 5(2): 185-194.
引用本文: 张超. 1983: 压扭性断裂的震前应力场与地应力变化异常. 地震学报, 5(2): 185-194.
1983: THE PRESEISMIC STRESS FIELD DUE TO A COMPRESSIONAL TORSIONAL FAULT AND STRESS VARIATION. Acta Seismologica Sinica, 5(2): 185-194.
Citation: 1983: THE PRESEISMIC STRESS FIELD DUE TO A COMPRESSIONAL TORSIONAL FAULT AND STRESS VARIATION. Acta Seismologica Sinica, 5(2): 185-194.

压扭性断裂的震前应力场与地应力变化异常

THE PRESEISMIC STRESS FIELD DUE TO A COMPRESSIONAL TORSIONAL FAULT AND STRESS VARIATION

  • 摘要: 为了探讨浅源构造地震孕育和发生的力学过程,本文提出了一种力学模式,其中把发震断层的震前状态划分为几个阶段,即相对稳定的闭锁区内应力积累——滑动区逐渐扩展、闭锁区收缩并造成闭锁应力高度集中——剩余闭锁区缩小至一定程度而导致断层剧烈错动的几个阶段.计算并分析了震源力学状态这种变化在其周围产生的附加应力场,以及反映这一过程的地应力变化特征.其结论与多年来地应力观测实践中取得的某些经验性认识相符,并较好地解释了1975年海城地震前的若干实测资料.
    Abstract: For studying the geomechanical process of the development and occurrence of shallow tectonic earthquakes, this paper proposes a model for the earthquake fault before the shock, consisting of three stages: the firststress accumulates in the relatively stable locked zone; the secondthe slipping zone extends and the locked zonecontracts in which high concentration of stress takes place; the thirdresiduallocked zone contracts to a certain degree causing violent displacement of the fault.Based on this variation of mechanical state at the earthquake fault, the additional stress given rise on its surroundings and the stress change of this process have been computed and analyzed. The results show that this model agrees with observations and experiences in practice and that it explains certain observed facts before the 1975 Haicheng earthquake.
  • [1] 李四光,地质力学概论,科学出版社,1973

    [2] 李四光,地壳构造与地壳运动——天文地质古生物资料摘要,科学出版社,1972

    [3] 丁文镜,强震前闭锁段附近断层错距分布特征,力学与实践,1, 1980.

    [4] 铁摩辛柯、古地尔,弹性理论,徐之纶、吴永祯译,高等教育出版社,1964

    [5] 中国科学院地质研究所四室,地震前形变异常的实验研究,地震战线,5, 1974.

    [6] 张超,钻孔法地应力测量中元件率定的若干力学问题,地应力测量的原理和应用,204——223,地质出版社,1981

    [7] 张超,应用地应力测值定性判别测区应力状态,地震,6, 1981.

    [8] 顾浩鼎等,1975年2月4日辽宁海城地震的震源机制,地球物理学报,19, 4, 1975.

    [9] 丹东市地震台,海城地震的地下水异常特征,地震战线,2, 1976.

    [1] 李四光,地质力学概论,科学出版社,1973

    [2] 李四光,地壳构造与地壳运动——天文地质古生物资料摘要,科学出版社,1972

    [3] 丁文镜,强震前闭锁段附近断层错距分布特征,力学与实践,1, 1980.

    [4] 铁摩辛柯、古地尔,弹性理论,徐之纶、吴永祯译,高等教育出版社,1964

    [5] 中国科学院地质研究所四室,地震前形变异常的实验研究,地震战线,5, 1974.

    [6] 张超,钻孔法地应力测量中元件率定的若干力学问题,地应力测量的原理和应用,204——223,地质出版社,1981

    [7] 张超,应用地应力测值定性判别测区应力状态,地震,6, 1981.

    [8] 顾浩鼎等,1975年2月4日辽宁海城地震的震源机制,地球物理学报,19, 4, 1975.

    [9] 丹东市地震台,海城地震的地下水异常特征,地震战线,2, 1976.

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  • 发布日期:  2011-08-31

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