ISHIKAWA YUZOup, ZHU CHUANZHENup2, CAD TIANQINGup3. 1983: ON SOME CHARACTERISTICS OF STRONG AFTERSHOCKS OF THE 1976 TANGSHAN, 1975 HAICHENG AND 1976 YANYUAN-NINGLANG EARTHQUAKES. Acta Seismologica Sinica, 5(1): 15-30.
Citation: ISHIKAWA YUZOup, ZHU CHUANZHENup2, CAD TIANQINGup3. 1983: ON SOME CHARACTERISTICS OF STRONG AFTERSHOCKS OF THE 1976 TANGSHAN, 1975 HAICHENG AND 1976 YANYUAN-NINGLANG EARTHQUAKES. Acta Seismologica Sinica, 5(1): 15-30.

ON SOME CHARACTERISTICS OF STRONG AFTERSHOCKS OF THE 1976 TANGSHAN, 1975 HAICHENG AND 1976 YANYUAN-NINGLANG EARTHQUAKES

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  • Published Date: August 31, 2011
  • The source mechanisms of strong aftershocks, that occurred after large earthquakes, have been closely investigated on the basis of the space-time distribution of smaller aftershocks around the mainshock fault area.Large intra-plate earthquakes that recently occurred in China, the 1976 Tangshan, 1975 Haicheng and 1976 Yanyuan-Ninglang earthquakes were well recorded at network stations over China. The hypocenters of smaller aftershocks just after the respective mainshocks and before and after several strong aftershocks weve located by a convergence method using S-P time. The faults of the strong aftershocks were traced from epicentral distribution of these smaller aftershocks. It was found that there are three different cases. In the first case, a strong aftershock occurred in a less concentrated portion of minor aftershocks within the mainshock fault area. The second case is that a strong aftershock along a fault being conjugate to the mainshock fault, and in the third case, it took place along a fault which is nearly parallel to and apart from the main shock fault. It might be concluded that geological conditions control the location where strong aftershocks occur.As possible precursors of the strong aftershocks, it was found that there were some foreshocks prior to a Tangshan strong aftershock with a magnitude of 7.1 and the change of the first motion direction in some stations located near the directions of mainshock faults. It may be considered that the stress field around there changed to some extent before the occurrence of the strong aftershocks.
  • [1] 大绿道男,地震の起リ方のツミエレーミヨン,第五部余震とは何な,地震(II),29, 137——145, 1976.

    [2] T. Mikumo and T. Miyatake, bynamic.3I rapture process on' a three——dimensional fault with nonuniform friction and near`field seismic waves, Geophya. J. Roy. dstrou. Soc., 54, 417——438, 1978.

    [3] K. Aki, Characterization of barriers on an earthquake fault, J.‘·五,84, 6140——6148, 1979.

    [4] 谷继成等,强余震的时间分布特征及其理论解释,地球物理学报,22,1,32——46, 1979.

    [5] 顾浩鼎等,1975年2月4日辽宁省海城地展的震源机制,地球物理学报,19, 4, 270——285, 1976,

    [6] 张之立,唐山地震的破裂过程及其力学分析,地震学报,2, 2, 111——129, 1980.

    [7] M. A. Sadovaky, I. L. Nevaecov et al, The processes of predicting strong earthquakes in some regiona of Middle Aaia, Tectomophysics, 14, No3/4, 295——307, 1972.

    [8] H. Wotahabo and A. Kuroiao, Seismic activity in the northern part of. ,the Kinki diBtriet and related problems (I)——Earthquake swarm accompanying the Wachi earthquake of Aug: 18, 1968, special comtributions,Geophyaical Institute, Kyoto Univ. No. 9, 123——136.

    [9] 井元政二郎,余震活动K すける活动域の缩小、移动Kついて(IV),地震学会讲演予稿集,No. 2, A33,1979.

    [10] 三云健、大塜道男、尾池和夫,和歌山地方の地殻构造と微小地震の凳震机构,地震II, 23, 213——225,1970.

    [11] H. Oike, The deep earthquake of June 22, 1966 in Bands Sea: A Multiple shock, Bulletin of D.P. R. L, Kyoto Univ , 19, 55——65, 1969.

    [12] 滕吉文等,北京、天津、唐山和张家口地区的地壳结构,地球物理学报,22, 3, 218——236, 1979,

    [13] 鄢家全等,强余晨的断层面解特征,地震学报,2, 4, 395——403, 1980,

    [14] R. Butler, G. S. Stewart and H. Kanamori, The July 27, 1976 Tangahan, China Earthquake——A complex sequence of intraplate events, B. S. S. A, 69, 1, 207——220, 1979.

    [15] 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——217,1979,

    [16] 林邦慧等,1977年5月12日宁河地震烈度明显偏低的探讨,地球物理学报,22, 1, 14——24, 1979,

    [17] J. C. Savage, Relation of corner frequency to fault dimensions, J. G.R.,77, 20, 3788——3795, 1972.

    [18] 安芸敬一等,地震の物理,岩波书店,1978.

    [19] 山下辉夫,Energy balance of fault motions and radiated seismic energy and seismic efficiency of shallow earthquakes, J. Phys. Earth, 27, 171——186, 1979.

    [20] J. Cipar, Source processes of the Haicheng, Chin, Earthquake from observations of P and S waves, B. S. S. A, 69, 1903——1916, 1979.

    [21] 吴开统等,海城地震序列的特征,地球物理学报,19, 2, 95——100, 1976,

    [22] 刘赛君等,盐源——宁菠地震余震序列,地震研究,2, 1978,

    [23] 津村建四郎,1978年伊豆大岛近海地震前后公地震活动,东京大学地震研究所巢报,3册,675——706, 1978.

    [1] 大绿道男,地震の起リ方のツミエレーミヨン,第五部余震とは何な,地震(II),29, 137——145, 1976.

    [2] T. Mikumo and T. Miyatake, bynamic.3I rapture process on' a three——dimensional fault with nonuniform friction and near`field seismic waves, Geophya. J. Roy. dstrou. Soc., 54, 417——438, 1978.

    [3] K. Aki, Characterization of barriers on an earthquake fault, J.‘·五,84, 6140——6148, 1979.

    [4] 谷继成等,强余震的时间分布特征及其理论解释,地球物理学报,22,1,32——46, 1979.

    [5] 顾浩鼎等,1975年2月4日辽宁省海城地展的震源机制,地球物理学报,19, 4, 270——285, 1976,

    [6] 张之立,唐山地震的破裂过程及其力学分析,地震学报,2, 2, 111——129, 1980.

    [7] M. A. Sadovaky, I. L. Nevaecov et al, The processes of predicting strong earthquakes in some regiona of Middle Aaia, Tectomophysics, 14, No3/4, 295——307, 1972.

    [8] H. Wotahabo and A. Kuroiao, Seismic activity in the northern part of. ,the Kinki diBtriet and related problems (I)——Earthquake swarm accompanying the Wachi earthquake of Aug: 18, 1968, special comtributions,Geophyaical Institute, Kyoto Univ. No. 9, 123——136.

    [9] 井元政二郎,余震活动K すける活动域の缩小、移动Kついて(IV),地震学会讲演予稿集,No. 2, A33,1979.

    [10] 三云健、大塜道男、尾池和夫,和歌山地方の地殻构造と微小地震の凳震机构,地震II, 23, 213——225,1970.

    [11] H. Oike, The deep earthquake of June 22, 1966 in Bands Sea: A Multiple shock, Bulletin of D.P. R. L, Kyoto Univ , 19, 55——65, 1969.

    [12] 滕吉文等,北京、天津、唐山和张家口地区的地壳结构,地球物理学报,22, 3, 218——236, 1979,

    [13] 鄢家全等,强余晨的断层面解特征,地震学报,2, 4, 395——403, 1980,

    [14] R. Butler, G. S. Stewart and H. Kanamori, The July 27, 1976 Tangahan, China Earthquake——A complex sequence of intraplate events, B. S. S. A, 69, 1, 207——220, 1979.

    [15] 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——217,1979,

    [16] 林邦慧等,1977年5月12日宁河地震烈度明显偏低的探讨,地球物理学报,22, 1, 14——24, 1979,

    [17] J. C. Savage, Relation of corner frequency to fault dimensions, J. G.R.,77, 20, 3788——3795, 1972.

    [18] 安芸敬一等,地震の物理,岩波书店,1978.

    [19] 山下辉夫,Energy balance of fault motions and radiated seismic energy and seismic efficiency of shallow earthquakes, J. Phys. Earth, 27, 171——186, 1979.

    [20] J. Cipar, Source processes of the Haicheng, Chin, Earthquake from observations of P and S waves, B. S. S. A, 69, 1903——1916, 1979.

    [21] 吴开统等,海城地震序列的特征,地球物理学报,19, 2, 95——100, 1976,

    [22] 刘赛君等,盐源——宁菠地震余震序列,地震研究,2, 1978,

    [23] 津村建四郎,1978年伊豆大岛近海地震前后公地震活动,东京大学地震研究所巢报,3册,675——706, 1978.

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