Geophysical studies of the Pianosa island have started in late November 2021 Researchers of the CNR-IGG, hosted in the BRP, carried out measurements of the subsoil electrical resistivity applying electrical and electromagnetic geophysical methods. These studies are aimed at increasing knowledge about the water circulation systems in the subsoil of the Pianosa island.
During this studies, a new instrumentation was tested for the construction of electrical resistivity tomographies (ERT), recently purchased by the CNR-IGG as a part of the observatory upgrading of the Pianosa Island. The tomographic acquisitions use a series of electrodes appropriately aligned and positioned in the ground. The measurement involves the insertion into the ground of an electric current (controlled) by means of a pair of electrodes and the measurement of the response (electric potential) through one or more pairs of electrodes proceeding with different measurement combinations.
Magnetotelluric measurements were also performed, which involve the measurement of electromagnetic fields naturally generated by the interaction of the solar wind with the earth's magnetic field and by storm activity for the study of the subsoil electrical resistivity. This methodology involves the use of particular sensors for measuring magnetic fields and electrodes for measuring the electric field.
These first tests will be followed by geophysical campaigns for the completion of these studies.
|
|