DETERMINATION OF ELECTRICAL CONDUCTIVITY OF SEA BED IN SHALLOW WATERS

Electric and magnetic field components produced by horizontal dipole antennas (both electric and magnetic) located within upper layer of two-layer conducting earth are derived for quasi- near range; this range is defined as that in which measurement distance is much greater than earth skin depth but much less than free-space wavelength; ionospheric effects are neglected; it is shown that sea bed conductivity may be determined by measuring only horizontal electric field components produced by subsurface horizontal magnetic dipole antenna.