| 摘要 |
A method for interpreting transient electromagnetic survey data includes imparting an electromagnetic field in the Earth's subsurface by passing elec tric current through a transmitter antenna. The electric current includes sw itched direct current at a selected switching frequency. Voltages induced in a receiver corresponding to electromagnetic effects induced in the Earth's subsurface are detected. Frequency domain electromagnetic response of the Ea rth's subsurface is determined from the detected voltages and transient elec tromagnetic response of the Earth's subsurface is determined from the detect ed voltages.
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