Method and system for seafloor geological survey using vertical electric field measurement

摘要

A system for mapping electrical conductivity of the seafloor incorporates a plurality of data logging units, where each unit ( 100 ) is an assembly adapted for deployment at a location on the seafloor for measurement of horizontal electric and magnetic fields. Rigidly attached and extending vertically from the unit assembly is a vertically-oriented substantially rigid arm ( 158 ) having a pair of vertically-displaced electrodes ( 160, 162 ) disposed on the arm to create a vertically-oriented dipole antenna. The electrodes are in electrical communication with an amplifier located within the assembly which generates an amplified signal which is then provided to a data logging processor also located within the assembly. The processor collects time series of amplified electric field and magnetic signals over a predetermined period of time.