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Xu Zhong-huaiup, Liu Yu-fenup, Zhang Ying-zhenup2. 1979: ON THE CHARACTERISTIC OF DIRECTION OF THE EARTHQUAKE STRESS FIELD AROUND THE BEIJING AERA. Acta Seismologica Sinica, 1(2): 121-132.
Citation: Xu Zhong-huaiup, Liu Yu-fenup, Zhang Ying-zhenup2. 1979: ON THE CHARACTERISTIC OF DIRECTION OF THE EARTHQUAKE STRESS FIELD AROUND THE BEIJING AERA. Acta Seismologica Sinica, 1(2): 121-132.
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ON THE CHARACTERISTIC OF DIRECTION OF THE EARTHQUAKE STRESS FIELD AROUND THE BEIJING AERA

  • 1. Institute of Geophysics, State Seismological Bureau; 2. State Seismological Bureau

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  • Published Date: August 31, 2011
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  • The composite nodal-plane solutions of the earthquakes occurred in the area around Beijing during 1960 to 1977 are obtained on the basis of P wave onset data and also the confidence curves of the results. The directions of the maximum and minimum principal stresses are given as NE 65°—75° and NW 15°—25° respectively, whereas that of intermediate stress is nearly vertical. They appear to be uniform and stable in the entire area. The fault angle of the crustal rock is estimated not less then 27°. It is inferred that the earthquakes in the area are caused probably by the action of additional horizontal tension. No significant variation of the composite nodal-plane solutions was found before the great Tangshan earthquake.
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  • [1] 李钦祖等, 由单台小地震资料所得两个区域的应力场, 地球物理学报, 16, 49—61, 1973.

    [2] K. Aki(安芸敬一), Earthquake generating stress in Japan for the years 1961 to 1963 obtained by smoothing the first motion patterns, Bull. Earthq. Res, Inst., 44, 447—471, 1966.

    [3] N. Yamakawa(山川宜男), Stress Fields in Focal Regions, J. Phys. Earth, 19, 347—353, 1971.

    [4] D. P. Mekenzie, The relation between fault plane solutions for earthquakes and the direction  of the principal stress, B. S. S. A.,  59, 591—601, 1969.

    [5] B. C. Haimson, The state of stress in the earth's crust, Rev. Geophys. Space Phys., 13, 3, 350—352, 1975.

    [6] 李四光, 地质力学概论, 科学出版社, 1973.

    [7] E. M. Anderson, The Dynamies of Faulting, Oliver & Boyd Ltd., Edinburgh, 1951.

    [8] R. M. Stesky et al., Friction in faulted rock at high temperature, and pressure, Tectomophysics, 23, 177—203, 1974.
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