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Lin Bang-hui, Chen Yun-tai, Wei Fu-sheng, Li Zhi-yongcommult. 1979: A STUDY OF ASYMMETRICALLY BILATERAL RUPTURE PROCESS WITH APPLICATION TO THE HAICHENG EARTHQUAKE. Acta Seismologica Sinica, 1(2): 133-149.
Citation: Lin Bang-hui, Chen Yun-tai, Wei Fu-sheng, Li Zhi-yongcommult. 1979: A STUDY OF ASYMMETRICALLY BILATERAL RUPTURE PROCESS WITH APPLICATION TO THE HAICHENG EARTHQUAKE. Acta Seismologica Sinica, 1(2): 133-149.
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A STUDY OF ASYMMETRICALLY BILATERAL RUPTURE PROCESS WITH APPLICATION TO THE HAICHENG EARTHQUAKE

  • Institute of Geophysics, State Seismological Bureau

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  • Published Date: August 31, 2011
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  • In this paper, We calculated and analysed the theoretical spectral amplitudes of the displacements of P waves in the far-field radiated from a rectangular fault whose made of rupture is bilateral and asymmetrical. A preliminary method for analyzing the rupture process is presented and applied to the study of the Haicheng earthquake which occurred on February 4, 1975. The results show that the rupture process of this shock is bilateral and asymmetrical along a NWW direction. The total length of the fault is 54 km. The principal rupture propagated 38 km in the NWW direction and 16 km in the SEE direction, both with velocity of about 1.3 km/sec. The source parameters are estimated as follows: the average dislocation of strike slip 117 cm; dip slip, 33cm; seismic moment, 5.2×1026 dyne-cm; stress drop 22 bars and strain drop, 3.3×10-5. The total energy amp;quot;released is 3.4×1022ergs.
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  • [1] 顾浩鼎、陈运泰等, 1975年2月4日辽宁省海城地震的震源机制, 地球物理学报, 19, 4, 270—285, 1976.

    [2] 王妙月等, 新丰江水库地震的震源机制及其成因的初步探讨, 中国科学, 第1期, 85—97, 1976.

    [3] J. C. Savage, Relation of corner frequency to fault dimensions, J. Geophys. Res., 77, 3788—3795, 1972.

    [4] 中国科学院地球物理研究所, 地震仪器概论, 科学出版社, 1978.

    [5] H. Berckhemer and K. H. Jacohs, Investigation of the dynamical process in earthquake foci by analyzing the pulse shape of body waves, AD—738953, 1968.

    [6] 陈运泰等, 根据地面形变的观测研究1966年邢台地震的震源过程, 地球物理学报, 18, 3, 164—182, 1975.

    [7] S. J. Gibowicz, Stress drop and aftershocks, Bull. Seism. Soc. Amer., 63, 4, 1433—1446, 1973.

    [8] R. J. Geller, The June 10, 1975 Kurile Islands tsunami earthquake, Fault Mechanics and its Relation to Earthqnake Prediction, 213—226, 1977.
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