In the detailed magnetotelluric survey of the structural development section of Gaoligongshan tunnel of Darui railway, the terrain within the survey line is seriously cut and the vegetation is dense. Node distributed acquisition is adopted to give full play to the advantages of ultra-small volume of equipment and improve the acquisition efficiency. The exploration depth is 1000m, and the electrical characteristics of magnetotelluric profile are basically consistent with geological and borehole data. The spatial characteristics of geological inferred faults in the deep are revealed, and the electrical characteristics of surrounding rock in multiple lithologic interfaces and tunnel elevations are found out.

Construction method: MT vector measurement, acquisition time 2 hours, electric track distance 20-40m, magnetic track distance 100m.