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- W9836632 abstract "The objective of this work is to develop a general method for remotely sensing the presence of tunneling activities using one or more boreholes and a combination of surface sources. New techniques for tunnel detection and location of tunnels containing no metal and of tunnels containing only a small diameter wire have been experimentally demonstrated. A downhole magnetic dipole and surface loop sources were used as the current sources. The presence of a tunnel causes a subsurface scattering of the field components created by the source. Ratioing of the measured responses enhanced the detection and location capability over that produced by each of the sources individually. 4 refs., 18 figs., 2 tabs." @default.
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- W9836632 date "1991-02-01" @default.
- W9836632 modified "2023-09-24" @default.
- W9836632 title "Electromagnetic geophysical tunnel detection experiments---San Xavier Mine Facility, Tucson, Arizona" @default.
- W9836632 hasPublicationYear "1991" @default.
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