地电地磁观测
observation of geoelectricity and geomagnetism
地下－地表水
groundwater and surface water
groundwater-surface water
地下地震测量
underground seismic survey
地下地质
subsurface geologic survey
subsurface geology
地下地质学
subsurface geologic survey
subsurface geology
地下电波法
underground EM wave method