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Surveys for underground cavities with the HFCSMT system in near-field regions
high frequency CSMT survey of underground cavities near-field
2009/3/5
The surveys for the tunnels at depths of about 15 m and 2 m were made with a high frequency controlled source magneto telluric (HFCSMT) system, of which transmitter is a horizontal loop-coil, in Kouya...