The movement age of hidden fault and analysis on width of its effect zone from shallow seismic sounding and drilling data |
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Authors: | Yang Xiao-ping Li De-qing Zhao Cheng-bin Liu Bao-jin Sun Zhen-guo Zhao Jing-yao |
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Affiliation: | (1) Institute of Geology, China Earthquake Administration, 100029 Beijing, China;(2) Geophysical Exploration Center, China Earthquake Administration, 450003 Zhengzhou, China;(3) Earthquake Administration of Zhengzhou City, 450000 Zhengzhou, China |
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Abstract: | Field experimental seismic sounding permitted us to obtain optimal shallow seismic reflection sounding parameters. In process of data processing, we obtained a high-qualitative shallow seismic reflection sounding profile by using the techniques such as filtering, edition surgical blanking, prediction deconvolution, fitting static correlation of first arrival time, and velocity analysis. Comprehensive analysis on the information of reflection wave groups along the seismic sounding profile and the stratigraphic and neogeochronological data obtained from many drills near the sounding line reveals that the upper termination of the detected fault zone is located at depth of 75–80 m, in the Middle Pleistocene deposits dated to be about 220 ka BP. The continuity, discontinuity, increasing and decreasing amount of reflection wave groups and change of their configurations, in combination with geological columns of drills, permitted us to know that the width of upper termination of the fault zone is 100 m. It can be inferred from the variation of number of reflection wave groups along the profile that the scarp of hidden fault is 200 m wide and the fault is a synsedimentary active fault in the Early Pleistocene and the early stage of Middle Pleistocene. No tectonic movement, which offset the covering deposits, had occurred since the late stage of Middle Pleistocene. Foundation item: A High-new Technique Project by State Development and Planning Commission of China (2001977). |
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Keywords: | shallow seismic reflection sounding drill geological data stratum dating hidden fault fault movement |
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