A seismic wave generating tool, such as a spark gap, of an electric arc generation device includes an upper part and a lower part defining a discharge chamber between them, at least one retaining arm connecting the upper part to the lower part, first and second electrodes respectively associated with the upper and lower parts and arranged in the discharge chamber. The retaining arm comprises an electrically insulating part facing the electrodes. The tool includes a first deployable device implementing a current return and connecting the upper part to the lower part. The first deployable device is configured to be in a retracted state and in a deployed state in which it is at a distance from the discharge chamber.

One or more images of subsurface geological features are generated based on recorded seismic data that contain controlled source components and uncontrolled source components blended together. A current recorded dataset is determined from the recorded seismic data, and one or more iterations of a separation procedure are performed on the current recorded dataset to accumulate isolated controlled source components and isolated uncontrolled source components therefrom. The one or more images are generated based on the isolated controlled source components and on the isolated uncontrolled source components.

One or more images of subsurface geological features are generated based on recorded seismic data that contain controlled source components and uncontrolled source components blended together. A current recorded dataset is determined from the recorded seismic data, and one or more iterations of a separation procedure are performed on the current recorded dataset to accumulate isolated controlled source components and isolated uncontrolled source components therefrom. The one or more images are generated based on the isolated controlled source components and on the isolated uncontrolled source components.

A spark-gap of the invention comprises: a first body supporting a first electrode mounting connected to a first electrode having a first electrode end, a second body supporting a second electrode mounting connected to a second electrode placed so as to face the first electrode end, and a connection arm connecting the first body to the second body. The first body and the second body have a generally cylindrical outer shape and are aligned along a common longitudinal axis. The first electrode end is offset, relative to the longitudinal axis, toward the side opposite the connection arm. The invention also relates to an electric arc generation device comprising such a spark-gap.

A spark-gap of the invention comprises: a first body supporting a first electrode mounting connected to a first electrode having a first electrode end, a second body supporting a second electrode mounting connected to a second electrode placed so as to face the first electrode end, and a connection arm connecting the first body to the second body. The first body and the second body have a generally cylindrical outer shape and are aligned along a common longitudinal axis. The first electrode end is offset, relative to the longitudinal axis, toward the side opposite the connection arm. The invention also relates to an electric arc generation device comprising such a spark-gap.

A probe for generating seismic waves, includes at least: a tubular body (10) having a first end linked to an electrical power cable, a capacitor bank arranged within the body, a spark gap installed at a second end of the body and linked to the capacitor bank, suitable for generating a seismic wave upon the release of the energy stored by the capacitor bank,
wherein: the capacitor bank is formed from cylindrical capacitors (621) including bases each having a different polarity, the capacitors are mounted coaxially to each other, parallel to the main axis of the body, and the capacitors are electrically linked into at least two groups of capacitors connected in parallel, each group of capacitors having a positive pole and a negative pole, the groups being arranged in the body such that the facing poles of two adjacent groups are of the same polarity.

A probe for generating seismic waves, includes at least: a tubular body (10) having a first end linked to an electrical power cable, a capacitor bank arranged within the body, a spark gap installed at a second end of the body and linked to the capacitor bank, suitable for generating a seismic wave upon the release of the energy stored by the capacitor bank,
wherein: the capacitor bank is formed from cylindrical capacitors (621) including bases each having a different polarity, the capacitors are mounted coaxially to each other, parallel to the main axis of the body, and the capacitors are electrically linked into at least two groups of capacitors connected in parallel, each group of capacitors having a positive pole and a negative pole, the groups being arranged in the body such that the facing poles of two adjacent groups are of the same polarity.