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WANG JUNGUO, WEI PENGFEI, WU XIAOZHIcom sh advance. 1988: COMPARATIVE STUDY BETWEEN THE CHARACTERISTICS OF SEISMIC WAVES RECORDED DOWNHOLE AND ON GROUNDSURFACE. Acta Seismologica Sinica, 10(3): 270-279.
Citation: WANG JUNGUO, WEI PENGFEI, WU XIAOZHIcom sh advance. 1988: COMPARATIVE STUDY BETWEEN THE CHARACTERISTICS OF SEISMIC WAVES RECORDED DOWNHOLE AND ON GROUNDSURFACE. Acta Seismologica Sinica, 10(3): 270-279.
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COMPARATIVE STUDY BETWEEN THE CHARACTERISTICS OF SEISMIC WAVES RECORDED DOWNHOLE AND ON GROUNDSURFACE

  • Tianjin Seismological Bureau

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  • Published Date: September 01, 2011
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  • A comparative study between the characteristics of seismic waves recorded downhole and on groundsurface in plain area is made; the travel time and the amplitude relationships of which are derived in this paper. Then the following conclusions are drown:1. Under the condition of uniform layered medium, tc, the travel time of seismic waves recorded on the ground is larger than th, the value recorded downhole. Their difference is given as follow:△t=tc-th=cosic/Vch Correspondingly, Tc, the travel time of seismic phase observed on groundsurface is greater than Th, the value observed downhole. The difference is represented by △T.2. Ahe ratio of Ac, the groundsurface amplitude to Ah, the downhole amplitude is defined as K = Ac/AhUnder specified conditions, K>1. Thus K is considered as the amplifying factor of the groundsurface amplitude relative to the downhole amplitude.The data observed downhole and on groundsurface at the Jinghai station are analysed and the results from the comparison between △T and K at a single station are obtained.
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    • References (1)
  • [1] 中国科学院地球物理研究所编著,近震分析,1977地震出版社.

    [2] 瓜野卓藏、末瓜重二、古田美佐夫、佐藤馨,地中地震计になめべツクグヲウンド·ノイブの研究(第二报),氧象研究所报告,19G9,20,189——206,

    [3] Doze, E. J., Noise Attenuation in shallow Holes, Bull Seism. Soc. Amen, 1966, 56, 619——632.

    [4] 高野敬,荻原尊礼,深井户地震计になる观测(第一报)东京大学地震研究所业报,1966,44,1135——1148,

    [5] 山本英二、滨田和郎、笠原敬司,岩枷深井观测所ひのベツクゲラウンド·ノイズなよひれむ媒体とすめノイズの除去,地震,1975,28,171——180

    [6] Markus Bath, Spectral A nalysis in Geophysics, 1974 Elsevier Scientific Publishing Company.

    [1] 中国科学院地球物理研究所编著,近震分析,1977地震出版社.

    [2] 瓜野卓藏、末瓜重二、古田美佐夫、佐藤馨,地中地震计になめべツクグヲウンド·ノイブの研究(第二报),氧象研究所报告,19G9,20,189——206,

    [3] Doze, E. J., Noise Attenuation in shallow Holes, Bull Seism. Soc. Amen, 1966, 56, 619——632.

    [4] 高野敬,荻原尊礼,深井户地震计になる观测(第一报)东京大学地震研究所业报,1966,44,1135——1148,

    [5] 山本英二、滨田和郎、笠原敬司,岩枷深井观测所ひのベツクゲラウンド·ノイズなよひれむ媒体とすめノイズの除去,地震,1975,28,171——180

    [6] Markus Bath, Spectral A nalysis in Geophysics, 1974 Elsevier Scientific Publishing Company.
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