Abstract: A method of processing geophysical data from a survey of a surveyed region of the earth to provide a three-dimensional representation of the underlying geology of said surveyed region, the method comprising: inputting geophysical data for said surveyed region, generating an initial three-dimensional representation depicting faults of said underlying geology of said surveyed region using said input geophysical data, calculating the accommodation zone for each depicted fault using geomechanical parameters including at least stress and strain, generating a final three-dimensional representation depicting both faults and accommodation zones.

Abstract: A gravity meter comprises a casing, a vacuum tube mounted in the casing in a vibration-free manner, a sensor mechanism mounted within the vacuum tube, the sensor mechanism comprising two masses of different size acting on the respective arms of a beam balance comprising a material whose shape is arranged to change in response to changes in gravity and whose shape can be restored by the application of an electrical current thereto, and detector means arranged to provide from the restoring current an output representative of changes in gravity. The material is preferably a piezoelectric material.