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GU JICHENGup, XIE XIAOBIup2, ZHAO LIup2. 1982: ON SPATIAL DISTRIBUTION OF LARGE AFTERSHOCKS OF THE SEQUENCE OF A MAJOR EARTHQUAKE AND PRELIMINARY THEORETICAL EXPLANATION. Acta Seismologica Sinica, 4(4): 389-394.
Citation: GU JICHENGup, XIE XIAOBIup2, ZHAO LIup2. 1982: ON SPATIAL DISTRIBUTION OF LARGE AFTERSHOCKS OF THE SEQUENCE OF A MAJOR EARTHQUAKE AND PRELIMINARY THEORETICAL EXPLANATION. Acta Seismologica Sinica, 4(4): 389-394.
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ON SPATIAL DISTRIBUTION OF LARGE AFTERSHOCKS OF THE SEQUENCE OF A MAJOR EARTHQUAKE AND PRELIMINARY THEORETICAL EXPLANATION

  • 1. Institute of Geophysics, State Seismological Bureau; 2. University of Science and Technology of China

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  • Published Date: August 31, 2011
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    • Abstract
  • Sequences of 11 major earthquakes occurred in the continental area of China have been analysed for the characteristics of their spatial distribution of large aftershocks. It is found that:1. The large aftershocks are located in three areas: in the vicinities of the ends of the earthquake fault and the epicenter of the main shock.2. The characteristics of spatial migration of the large aftershocks are as follows: (1) The migration distance of the large aftershocks corresponds to the rupture length of the main shock, and increases with time; (2) The distance and direction of migration are related to the rupture pattern. For stronger main shocks with unilateral rupture, the migration of large aftershocks relative to the epicenter of the main shock will be unilateral; for an earthquake with bilateral rupture, the migration of the large aftershocks will be some what similar to relaxation oscillation from one end of the earthquake fault to the other relative to the epicenter of the main shock. For a twin earthquake (two main shocks), the large aftershocks migrate usually in a unilateral manner relative to the first main shock while in a bilateral manner relative to the second main shock.3. The vertical distribution of the large aftershocks in a section is within the fault plane and mostly are located on the front of the fault.A preliminary theoretical explanation for the above observational results has been attempted based upon the principles of rheology and fracture mechanics.
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    • References (1)
  • [1] P .Richter, Elementary Seismology, Chapter 6, 1958.

    [2] N. Yamakawa (山川宜男),Foreshocks, aftershocks and earthquake swarms (VI), Papers in iVIeteorology and Geophysics, 20, 3, 275——286, 1969.

    [3] I. N. Gupta, Dilatancy and spatial distribution of aftershocks, Bull. Seis. Soc. dm., 64, 4,1707——1713, 1974.

    [4] M. Bonafeda, F. Mulargia and E. Boschi, A physical model for the prediction of large late aftershocks, Presented at the International Symposium on Earthquake Prediction, 2——6, April,1979, Paris.

    [5] 石川有三,朱传镇,曹夭青,大地震强余震特征的研究,地晨学报,待发表.

    [6] 谷继成,从断裂力学观点研究地震的力学过程,地震科学研究,第二辑,1980,

    [7] 谷继成,谢小碧,赵莉,强余震的时间分布特点及其理论解释,地球物理学报,22, 1, 32——46, 1979,

    [8] S. T. Algermissen, Preshoeks and aftershocks, The Great Alaska Earthquake of 1964, p. 313.

    [1] P .Richter, Elementary Seismology, Chapter 6, 1958.

    [2] N. Yamakawa (山川宜男),Foreshocks, aftershocks and earthquake swarms (VI), Papers in iVIeteorology and Geophysics, 20, 3, 275——286, 1969.

    [3] I. N. Gupta, Dilatancy and spatial distribution of aftershocks, Bull. Seis. Soc. dm., 64, 4,1707——1713, 1974.

    [4] M. Bonafeda, F. Mulargia and E. Boschi, A physical model for the prediction of large late aftershocks, Presented at the International Symposium on Earthquake Prediction, 2——6, April,1979, Paris.

    [5] 石川有三,朱传镇,曹夭青,大地震强余震特征的研究,地晨学报,待发表.

    [6] 谷继成,从断裂力学观点研究地震的力学过程,地震科学研究,第二辑,1980,

    [7] 谷继成,谢小碧,赵莉,强余震的时间分布特点及其理论解释,地球物理学报,22, 1, 32——46, 1979,

    [8] S. T. Algermissen, Preshoeks and aftershocks, The Great Alaska Earthquake of 1964, p. 313.
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