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ZHAO GENMO, CHU BAOLONG, Guo RUIZHIcom sh advance. 1984: THE CHANGE OF ORIENTATION OF STRESS OF THE MINOR EARTHQUAKES BEFORE THE STRONG NINGHE EARTHQUAKE OF 1976. Acta Seismologica Sinica, 6(4): 414-424.
Citation: ZHAO GENMO, CHU BAOLONG, Guo RUIZHIcom sh advance. 1984: THE CHANGE OF ORIENTATION OF STRESS OF THE MINOR EARTHQUAKES BEFORE THE STRONG NINGHE EARTHQUAKE OF 1976. Acta Seismologica Sinica, 6(4): 414-424.
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THE CHANGE OF ORIENTATION OF STRESS OF THE MINOR EARTHQUAKES BEFORE THE STRONG NINGHE EARTHQUAKE OF 1976

  • Seismological Bureau of Tianjin

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  • Published Date: August 31, 2011
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    • Abstract
  • The focal mechanisms of minor earthquakes before the strong Ninghe earthquake of November 15, 1976 (Ms=6.9) are analysed. Within three months before this earthquake, the orientations of the principal stress axes started to be disordered and again oriented and finally deviated. The deviation of the strike of the P-axis was about 40. Based on the conjugate nature of the faults developed in this region, such deviation in stress direction has been priliminary explained geologically. In addition, by stacking up of all the signs of the first motions of minor earthquakes, the average focal mechanism solutions can be obtained. They show only disordering and reorientation but not deviation, which may be caused by the nature of the data and the method of analysis used.
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    • References (1)
  • [1] 张之立、李钦祖、谷继成、靳雅敏、杨想源、刘万琴,唐山地震的破裂过程及其力学分析,地震学报,2, 2, 111——129 1980.

    [2] 李钦祖、刁桂芬、戴英华,唐山地震序列的应力释放调整过程,地球物理学报,26, 3, 224——236 1983.

    [3] 许忠淮、刘玉芬、张邓珍,京津唐地区小地震的平均释放应力场,地震学报,1, 2, 121——132 1979.

    [4] Brady, B. T., Theory of earthquakes, I, Pure and ApPl. Geophys, 112, 701——725, 1974.

    [5] Brady, I3. T., Theory of earthquakes II Pure and Appt. C——eophys, 113, 149——168, 1975.

    [6] 陈非比等,1976年唐山地震,地震出版社,1982.

    [1] 张之立、李钦祖、谷继成、靳雅敏、杨想源、刘万琴,唐山地震的破裂过程及其力学分析,地震学报,2, 2, 111——129 1980.

    [2] 李钦祖、刁桂芬、戴英华,唐山地震序列的应力释放调整过程,地球物理学报,26, 3, 224——236 1983.

    [3] 许忠淮、刘玉芬、张邓珍,京津唐地区小地震的平均释放应力场,地震学报,1, 2, 121——132 1979.

    [4] Brady, B. T., Theory of earthquakes, I, Pure and ApPl. Geophys, 112, 701——725, 1974.

    [5] Brady, I3. T., Theory of earthquakes II Pure and Appt. C——eophys, 113, 149——168, 1975.

    [6] 陈非比等,1976年唐山地震,地震出版社,1982.
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