1984: THREE DIMENSIONAL ANALYSIS OF FRACTURE PROCESS OF THE 1976 TANGSHAN EARTHQUAKE. Acta Seismologica Sinica, 6(1): 22-28.
Citation: 1984: THREE DIMENSIONAL ANALYSIS OF FRACTURE PROCESS OF THE 1976 TANGSHAN EARTHQUAKE. Acta Seismologica Sinica, 6(1): 22-28.

THREE DIMENSIONAL ANALYSIS OF FRACTURE PROCESS OF THE 1976 TANGSHAN EARTHQUAKE

  • Publish Date: 2011-09-01
  • Following a previous paper by the same author[1], the fracture process of the Tangshan Earthquake of July 28, 1976 is hereby further studied. A three dimensional mechanical model is now presented and more complete results in comparison with that by two dimensional model are obtained. It is found that there exists an alpha () angulad region of about 10?near each end of the major axis of the main fault. Within the angular region, the initial extension direction of points on the fault front is no longer coplanar with the plane of the main fault but in a plane making an angle (0,0) with it. However for other parts of the fault, the front extents in the fault plane. Near the end points of the major axis the angle 00 080.5They agree with the didections obtained from two dimensional analysis. It is because that the extension within the angular region of about 10at the end points of the major axis of the fault plane is not coplanar, a large number of aftershocks occurred along this direction. So the fault plane becomes contorted in shape.

     

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    [1] 张之立等,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] H. Tada, P. C. Paris and G. R. Irwin, The stress analysis of cracks handbook, 1}c1. Res. Corp.Pennsylvania, 1973.

    [3] G. C. Sih, Strain energy density factor applied to mixed mode crack problems, fret. J, of Fraetrrre, 10,305——321, 1974.

    [4] 张之立等,三维断裂扩展方向的理论分析和余震分布图象的预报,地球物理学报,25, Supp, 569——581, 1982.

    [5] 邱群,1976年7月28日河北省唐山7.8级地震的发震背景及其活动性,地球物理学报,17, 4, 259——269,1976.

    [6] R. Bulter, G. S. Stewart and H. Kanamori, The July ?7, 1976, Tangahan, China Earthquake, A complex sequence of intraplate events, Bull. Seim.Soc. Am., B9, 1, 207——220, 1979.

    [7] 陈运泰等,用大地测量资料反演的1976年唐山地震的位错模式,地球物理学报,22, 3, 201——216, 1979,

    [8] 张祖胜等,地形变背景和异常分析<一九七六年唐山地震>,地震出版社,131——170, 1982
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