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ZHU CHUAN-ZHEN, FU CHANG-HONG, LUO SHENG-LIcom sh adv. 1981: STUDY OF EARTHQUAKE SWARMS IN RELATION TO LARGE EARTHQUAKES (NORTH CHINA AREA). Acta Seismologica Sinica, 3(2): 105-117.
Citation: ZHU CHUAN-ZHEN, FU CHANG-HONG, LUO SHENG-LIcom sh adv. 1981: STUDY OF EARTHQUAKE SWARMS IN RELATION TO LARGE EARTHQUAKES (NORTH CHINA AREA). Acta Seismologica Sinica, 3(2): 105-117.
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STUDY OF EARTHQUAKE SWARMS IN RELATION TO LARGE EARTHQUAKES (NORTH CHINA AREA)

  • Institute of Geophysics, State Seismological Bureau

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  • Published Date: August 31, 2011
    Graphical Abstract
    • Abstract
  • From 1956 to 1976, there occurred thirty-seven earthquake swarms in North China, (i.e. east of 106 E, north of 33N, south of 42 N and west of Yellow sea). Among these, the number of earthquake swarms occurred just after the 1966 Xingtai (邢台) Earthquake to the 1976 Tangshan (唐山) Earthquake is about three times more than the number of swarms occurred in the period of 1956-1966. During the last ten years, all of the large earthquakes (M>7.0) occurred on the background of a continuously increasing activities of earthquake swarms.In view of the spatial distribution, the scope of activity of earthquake swarms) is limited in smaller areas, close to the epicenters of future large earthquakes. However, since 1974, the swarm activity has been clearly enlarged in spatial distribution. Around the epicenter of the subsequent Tangshan Earthquake, both in the NE-SW and NW-SE directions it was lengthened by more than 1000 kms, in less than half a year before the earthquake.Such a phenomenon of seismic activity spreading out from the epicenter of the impending major earthquake with the lapse of time can also be noticed before several historical earthquakes, the average spreading rate may be roughly estimated as about 100 km/year.Besides, it is also observed that precursory earthquake swarms, appear several months to one or two years before the impending large earthquakes at a not too far distance (about 100 kms).The possible differences between the precursory earthquake swarms and the ordinary ones in focal mechanism, dynamic source parameters, b value as well as the amplitude ratios of P and S waves have-been analysed. Preliminary results show that the stress drops for precursory earthquake swarms are higher. Finally, the physical and tectonic conditions under which precursory swarms might be observed are briefly discussed.
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    • References (1)
  • [1] 関谷溥,群凳性地震と地震予知,地震予知研究ッンポジワム,1972

    [2] 茂木清夫,地震活动と地震予知,地震予知ッンポジワム,1977

    [3] M .Isliida, and H. Kanamori., The foresliock activity of the 1971 san fernaudo earthquake California, BSSA,68, 5,1265——1280,1978

    [4] F. F. Evison, Precursory seismi;e sequences in mew Zealand,NZ Jour of Geology and Geo——physics,20,11129——141,1977.

    [5] F. F. Evison, The precursory earthquake swarm, Phaysics of the earth and Planatary Interiors,15,19——23,1977

    [6] 华北地区ML地震目录(1952——1974)地震出版社(待发表).

    [7] 北京及邻区地震目录汇编,地震出版社(待发表).

    [8] 张祖胜,唐山7.8级地震的地面形变,欧洲地震委员会地球物理年会报告,1978,斯特拉斯堡.

    [9] 赛克斯,缓慢地震与应力重新分布,国外地震,3, 10——13, 1979

    [10] 许忠淮等,京津唐张地区地震应力场的方向特征,地震学报,1, 2, 121——132, 1979

    [11] 约翰逊,粘滑源参数和地震源参数,国外地震,4, 41——43, 1975

    [12] T .Mikumo, Source process of deep and Intermediate eartliauakes as inferred from long——period P and S waveforms, Physics of the Earth, 19. 4. 303——320. 1971,

    [13] 朱传镇等,海城地震前后微震震源参数和介质品质因子,地球物理学报,20, 3, 228——231, 1977.

    [14] R. Green, A. McGarr, A comparison of the focal mechanism and aftersliock distribution of the Ceres South Africa earthquake of September 29, 1969, BSS9, 62, 3, 869——871, 1972

    [15] 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

    [16] 邢台地震总结,地震出版社(待发表).

    [17] 顾浩鼎等,1975, 2, 4.辽宁省海城地震的震源机制,地球物理学报,19, 4, 270——284, 1976.

    [18] 吴开统等,海城地震序列的特征,地球物理学报,19, 2, 95——109, 1976.

    [19] D. F'. Hill, A model of earthquake swarm J. G.R.82. 8. 1347——1352. 1977.

    [1] 関谷溥,群凳性地震と地震予知,地震予知研究ッンポジワム,1972

    [2] 茂木清夫,地震活动と地震予知,地震予知ッンポジワム,1977

    [3] M .Isliida, and H. Kanamori., The foresliock activity of the 1971 san fernaudo earthquake California, BSSA,68, 5,1265——1280,1978

    [4] F. F. Evison, Precursory seismi;e sequences in mew Zealand,NZ Jour of Geology and Geo——physics,20,11129——141,1977.

    [5] F. F. Evison, The precursory earthquake swarm, Phaysics of the earth and Planatary Interiors,15,19——23,1977

    [6] 华北地区ML地震目录(1952——1974)地震出版社(待发表).

    [7] 北京及邻区地震目录汇编,地震出版社(待发表).

    [8] 张祖胜,唐山7.8级地震的地面形变,欧洲地震委员会地球物理年会报告,1978,斯特拉斯堡.

    [9] 赛克斯,缓慢地震与应力重新分布,国外地震,3, 10——13, 1979

    [10] 许忠淮等,京津唐张地区地震应力场的方向特征,地震学报,1, 2, 121——132, 1979

    [11] 约翰逊,粘滑源参数和地震源参数,国外地震,4, 41——43, 1975

    [12] T .Mikumo, Source process of deep and Intermediate eartliauakes as inferred from long——period P and S waveforms, Physics of the Earth, 19. 4. 303——320. 1971,

    [13] 朱传镇等,海城地震前后微震震源参数和介质品质因子,地球物理学报,20, 3, 228——231, 1977.

    [14] R. Green, A. McGarr, A comparison of the focal mechanism and aftersliock distribution of the Ceres South Africa earthquake of September 29, 1969, BSS9, 62, 3, 869——871, 1972

    [15] 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

    [16] 邢台地震总结,地震出版社(待发表).

    [17] 顾浩鼎等,1975, 2, 4.辽宁省海城地震的震源机制,地球物理学报,19, 4, 270——284, 1976.

    [18] 吴开统等,海城地震序列的特征,地球物理学报,19, 2, 95——109, 1976.

    [19] D. F'. Hill, A model of earthquake swarm J. G.R.82. 8. 1347——1352. 1977.
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