Abstract: A method of seismic exploration using acoustic logging comprises transmitting and receiving sound waves, recording all of the signals received by the receivers, the respective positions of the emitter-receiver pair which give rise to each recording, grouping the recordings in pairs so that each recording of a given pair of sound paths have a common path segment and a part which is not common to both which is located facing the geological stratum of interest and the difference in time of arrival for at least one type of wave is measured for each pair.

Abstract: Seismic exploration on land and on ocean beds is performed by emitting vibrational acoustic signals of long time-duration within a desired frequency spectrum at one or a number of points, the signals corresponding to the waves received from the reflectors being then processed. The method further consists in forming the complex spectrum of the received signal corresponding to the emitted signal in respect of each frequency band, in forming the complex spectrum of a reference of the emitted signal in respect of each frequency band and in dividing the complex spectrum of the received signal by the complex spectrum of the reference of the emitted signal, at least an external portion of each complex spectrum being eliminated in the case of each complex spectrum.