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ZHANG ZHILI, FANG XING, YIAN HONGcom sh advance. 1987: A MECHANICAL MODEL OF THE FORMATION MECHANISM OF THE SHANXl GRABEN ZONE AND THE CHARACTERIS-TICS OF SHANXl EARTHQUAKE ZONE. Acta Seismologica Sinica, 9(1): 28-36.
Citation: ZHANG ZHILI, FANG XING, YIAN HONGcom sh advance. 1987: A MECHANICAL MODEL OF THE FORMATION MECHANISM OF THE SHANXl GRABEN ZONE AND THE CHARACTERIS-TICS OF SHANXl EARTHQUAKE ZONE. Acta Seismologica Sinica, 9(1): 28-36.
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A MECHANICAL MODEL OF THE FORMATION MECHANISM OF THE SHANXl GRABEN ZONE AND THE CHARACTERIS-TICS OF SHANXl EARTHQUAKE ZONE

  • Institute of Geophysics, State Seismological Bureau

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  • Published Date: September 01, 2011
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    • Abstract
  • The Shanxi Graben zone in North China is a small continental rift valley. Its principal characteristics are the same as that of the other continental rife valleys of the world. Based on the observed facts that the formation and development of the rift valleys and grabens are the results of the propagation of the fracture system existing in the crust, it is possible to study the mechanism of their mechanical formation by using the method of fracture mechanics. In this paper, a three-dimensional mechanical model is presented in order to study the formation and development processes of the Shanxi graben and explain the zigzag pattern of the Shanxi graben system. The angles between the segments of shear and tension are calculated from this model and their magnitude depends on such factors as the direction of the regional stress field, the aspect ratio between the depth and length of the graben fracture zone, the mechanical properties of the materials etc. The general direction of the tension segments always directs to that of the maximum principal compression stress of this region, so that the direction of the maximum principal compression stress of the region can be given from the general direction of the tension segments and vice versa. The characteristics of earthquake distribution in the Shanxi graben zone are also analysed by means of the seismicity data.Besides the Shanxi graben system, the Rhine graben, the Rio Grande rift valley and the Baikal rift valley are also analysed by using the same method. The results show that there also exist obvious segments of shear and tension in grabens and rift valleys.
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    • References (1)
  • [1] 光谱,漫话山西地堑,地震战线,19793: 1——3,

    [2] 巩玉琪,山西地堑带地质构造特征及地震活动性,山西地震,1980,1,22——26,

    [3] 张文佑、钟嘉酞、叶洪、从柏林,初论断裂的形成和发展及其与地震的关系,地质学报,1,17——27,1975,

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

    [5] 张之立、刘新美,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,增刊,569——581,1982,

    [6] Sih, G. C., Mechanics of fracture, Noordhoff lnt. Pub., 1973.

    [7] Brace, W. F., and E. G. Bombolakis, A note on brittle crack growth in compression, J. Geophys. Res,68,3709——3713, 1963.

    [8] Hoek, E. and Z. T. Bieniawski, Brittle fracture propagation in rock under compression, Int. J. of Fraczure Mech., 3, 137——155, 1965

    [9] Ahorner, L., Seismotectonic relations between the graben zones of the Upper and Lower Rhine valley, In:H. J. Illies and S. Mueller (Eds). Graben Problems, Schweizerbart, Stuttgart, 155——15G, 1970.

    [10] Logatchev, N. A., and N. A. Florensov, The Baikal system of Rift valleys, Tectonophyrics, 45, 1——13, 1978

    [11] 张文佑、李荫槐、马福臣、钟嘉酞,地堑形成的力学机制,地质科学,1, 1——11, 1981,

    [12] Golombek, M.P., G. E, hlcGill, and L. Brown, Tectonic and geologic evolution of the Espanola basin, Ric Grande rift:Structure rate of extension, and relation to the state of stress in the western United States Tectonophysics,94,483——507,1983.

    [1] 光谱,漫话山西地堑,地震战线,19793: 1——3,

    [2] 巩玉琪,山西地堑带地质构造特征及地震活动性,山西地震,1980,1,22——26,

    [3] 张文佑、钟嘉酞、叶洪、从柏林,初论断裂的形成和发展及其与地震的关系,地质学报,1,17——27,1975,

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

    [5] 张之立、刘新美,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,增刊,569——581,1982,

    [6] Sih, G. C., Mechanics of fracture, Noordhoff lnt. Pub., 1973.

    [7] Brace, W. F., and E. G. Bombolakis, A note on brittle crack growth in compression, J. Geophys. Res,68,3709——3713, 1963.

    [8] Hoek, E. and Z. T. Bieniawski, Brittle fracture propagation in rock under compression, Int. J. of Fraczure Mech., 3, 137——155, 1965

    [9] Ahorner, L., Seismotectonic relations between the graben zones of the Upper and Lower Rhine valley, In:H. J. Illies and S. Mueller (Eds). Graben Problems, Schweizerbart, Stuttgart, 155——15G, 1970.

    [10] Logatchev, N. A., and N. A. Florensov, The Baikal system of Rift valleys, Tectonophyrics, 45, 1——13, 1978

    [11] 张文佑、李荫槐、马福臣、钟嘉酞,地堑形成的力学机制,地质科学,1, 1——11, 1981,

    [12] Golombek, M.P., G. E, hlcGill, and L. Brown, Tectonic and geologic evolution of the Espanola basin, Ric Grande rift:Structure rate of extension, and relation to the state of stress in the western United States Tectonophysics,94,483——507,1983.
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