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acoustic anomaly apparent application approximately associated borehole buried caused changes channel clay coal common completion conductivity consisted contained core density depth detection determine drilling effect electrical electrode electromagnetic engineering environment Environmental example exploration feet field Figure flow fluid formation fracture gamma geologic geophysical gradient grid ground ground penetrating radar hole included indicate interpretation interval Lake Lignitic limited lithology located magnetic material measurements meters methods migration minerals mining natural neutron observed obtained occur ohm-m overburden physical porosity potential present probe problems processing properties radar range receiver recorded reflection refraction relative resistivity response rock sample sand seismic seismic refraction shown shows spacing subsurface surface survey techniques temperature thickness total field units values velocity vertical void waste water table wave zones