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WEI BAILIN, XUE JIAMOU, WU XIANJI, ZHANG LINYUNcom sh. 1983: STUDY ON THE TYPES OF EARTHQUAKE FAULTING OF THE HAIFENG EARTHQUAKE SWARM. Acta Seismologica Sinica, 5(4): 418-428.
Citation: WEI BAILIN, XUE JIAMOU, WU XIANJI, ZHANG LINYUNcom sh. 1983: STUDY ON THE TYPES OF EARTHQUAKE FAULTING OF THE HAIFENG EARTHQUAKE SWARM. Acta Seismologica Sinica, 5(4): 418-428.
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STUDY ON THE TYPES OF EARTHQUAKE FAULTING OF THE HAIFENG EARTHQUAKE SWARM

  • Seismological Bureau of Guangdong Province

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  • Published Date: August 31, 2011
    Graphical Abstract
    • Abstract
  • The major Haifeng-Meilong fault trending NE and a series of small faults parallel to it are distributed in the Haifeng earthquake region. Besides, there also exist disconnected conjugate faults trending NW. The nodal planes of the focal mechanisms of the largest shocks of each of the three sub-swarms are quite similar and one of the nodal plane is trending NE and that of the other NW. According to the space distribution of the aftershock sequences and the direction of the longer axis of the maximum intensity region, the faults causing the earthquake ML 3.3 on February 26 and ML 4.2 on April 9 should strike NE while that associated with the event ML 3.4 on March 14 strikes NW. In addition, by examining the data of signs of first motion of 137 small earthquakes recorded by four seismic stations, we found that there are eight types of combinations from which composite focal mechanisms can b eobtained. Therefore the fracturing process associated with the main-shock as well as theⅠ, Ⅵ type small earthquakes are stick-slip of rock masses along conjugate faults trending NE and NW. The small earthquakes of the Ⅱ, Ⅲ, Ⅳ, Ⅴ, Ⅶ, Ⅷ types are concerned with the. shear fractures caused by a transformed stress field resulted from compression on adjacent rockmasses at the front and tension on the rear and parallel to the direction of slip during the stick-slip of rockmasses.
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    • References (1)
  • [1] 魏柏林等,广东海丰震群字列特征,地震地质,4, 1, 1932.

    [2] 朱传镇等,震群与大地震关系的研究,地震学报,3, 2, 1981.

    [3] 吴开统等,海城地震序列特征,地球物理学报,19, 2, 1976.

    [4] 迁浦贤,论从地晨波形的相似性看前震与震群的差异,日本地震学会1979年度春季大会讲演预稿集,地震译丛,1, 1980.

    [5] 柯龙生等,前震序列与一般小震群活动规律的探讨,地球物理学报,20, 2, 1977.

    [6] 陈颙,用震源机制的一致性作为描述地震活动性的新参数,地球物理学报,21, 2, 1977.

    [7] 国家地震局广州地震大队,中国大地构造图,地图出版社,1975.

    [8] 魏柏林等,东南地震区现代构造应力场与地震活动,地震科学研究,1, 1981.

    [9] 林纪曾等,东南沿海地区的震源机制与构造应力场,地震学报,2, 4, 1980.

    [10] 魏柏林,余震震源机制变化的原因,地球物理学报,23, 1, 1980.

    [1] 魏柏林等,广东海丰震群字列特征,地震地质,4, 1, 1932.

    [2] 朱传镇等,震群与大地震关系的研究,地震学报,3, 2, 1981.

    [3] 吴开统等,海城地震序列特征,地球物理学报,19, 2, 1976.

    [4] 迁浦贤,论从地晨波形的相似性看前震与震群的差异,日本地震学会1979年度春季大会讲演预稿集,地震译丛,1, 1980.

    [5] 柯龙生等,前震序列与一般小震群活动规律的探讨,地球物理学报,20, 2, 1977.

    [6] 陈颙,用震源机制的一致性作为描述地震活动性的新参数,地球物理学报,21, 2, 1977.

    [7] 国家地震局广州地震大队,中国大地构造图,地图出版社,1975.

    [8] 魏柏林等,东南地震区现代构造应力场与地震活动,地震科学研究,1, 1981.

    [9] 林纪曾等,东南沿海地区的震源机制与构造应力场,地震学报,2, 4, 1980.

    [10] 魏柏林,余震震源机制变化的原因,地球物理学报,23, 1, 1980.
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