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| Citation: | Zhang Jiong, Chen Xiaobin, Yin Xiaokang, Zhao Siwei, Ye Tao, Xu Zhengxuan, Cai Juntao, Wang Peijie, Zhang Yunyun, Liu Zhongyin, 2022. 3-D AMT Array Exploration in the Selaha Fault and Adjacent Area. Earth Science, 47(3): 856-866. doi: 10.3799/dqkx.2022.060
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In order to avoid the geological hazards to the greatest extent in the processing of tunnel routes in the Selaha segment of the Sichuan-Tibet Railway line, we use audio magnetotelluric (AMT) data and obtain a reliable 3-D electrical structure model in the Salaha fault and adjacent area. The 3-D electrical resistivity model is comprehensively interpreted with the investigation of active faults. There is a large-scale high resistivity body at the depth from surface to 500 m, where the local area controlled by the faults is of low resistivity. Beneath the shallow 500 m, the resistivity decreases significantly, which results from the fault zone rich in aqueous fluids. In addition, there are two high conductors C1 and C2 in the study region; one is in the Mugecuo south stage area at the northwestern side of the Salaha fault, and the other is in the eastern side of the fault intersection area. These high conductors are presumed to be structural soft rocks. Therefore, it should be avoided as far as possible in designing the tunnel route.
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