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DING ZHIFENG, ZENG RONGSHENG. 1990: A PRELIMINARY STUDY OF FOCAL DEPTH DISTRIBUTION IN THE BEIJING-TIANJIN-TANGSHAN AREA. Acta Seismologica Sinica, 12(3): 242-247.
Citation: DING ZHIFENG, ZENG RONGSHENG. 1990: A PRELIMINARY STUDY OF FOCAL DEPTH DISTRIBUTION IN THE BEIJING-TIANJIN-TANGSHAN AREA. Acta Seismologica Sinica, 12(3): 242-247.
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A PRELIMINARY STUDY OF FOCAL DEPTH DISTRIBUTION IN THE BEIJING-TIANJIN-TANGSHAN AREA

  • Institute of Geophysics, State Seismological Bureau, Beijing

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  • Published Date: September 01, 2011
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  • When locating the earthquakes along the line Tangshan to Zhangjiakou in the Beijing-Tianjin-Tangshan area,we select the differences of arrival times at station-pairs to determine the position of the epicenter and use the differences in arrival times of seismic phases to determine depths of foci,seperately. This can raise the location accuracy. The earthquake sources of this area distribute between the depths of 5—22 km. This is in agreement with the estimated distribution,with depth,of crustal rock strength. So,we deduce that the crust here has the following characterisic: the upper part is fragile,and the lower part is plastic. The transition depth is about 20 km.
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    • References (1)
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    [3] 马宗晋、薛峰,1983.中国大陆地震深度分布与"易震层"初探.地震科学研究,3:43—46.

    [4] 臧绍先、杨军亮,1984.我国华北等地区板内地震的深度分布及其物理背景.地震地质,6,3,67—76.

    [5] 薛志照,1986.唐山地震震源深度分布与地壳结构的关系.地震地质,8,3,69—78.

    [6] 郝书俭、高华根、王春华,1982.京津唐地区居里等温面及其与地震的关系.地球物理学报,25,264—269.

    [7] Romney, C., 1957. Seismic waves from the Dixie Valley—Fairview Peak earthquakes, Bull. Seism. Soc.Amer, 47, 301—319.

    [8] Vetter, U. and Meissner, R., 1979. Rheologic properties of the lithosphere and application to passive continental margins, Tectonophysics, 59, 367—380.

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