Patent ID: 8253418

Claim:
A system for measuring electric properties of geologic formations within an area of interest on the seafloor, the system comprising: a data logger; one or more long-wires in electrical communication with the data logger for deployment on or above the seafloor in the area of interest, the one or more long-wires having a length greater than 10 m; and two or more pairs of electrodes disposed on the one or more long-wires in a serial relationship to each other, wherein each pair of electrodes defines an antenna that detects electric fields propagated beneath the seafloor and generates a signal in response thereto, wherein the signal is communicated to the data logger; wherein the signal comprises an amplitude and a phase, and the data logger collects the signals generated by the two or more pairs of electrodes and communicates the collected signals to a data processor for calculation of amplitude gradient and phase velocity in the area of interest by differencing the amplitude and phase measured by each pair of electrodes.