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GEOPHYSICS

The applications of geophysical methods include various fields: from near-surface researches to environmental ones, from engineering researches to hydrogeological ones.

We developed many Electromagnetics methods (both Frequency and Time Domain), so that we presented some experiences of ours to international meetings (the 1st Meeting of EEGS in Turin and the International Congress on Environment/Climate of UNESCO in Rome).

We report a case-history from a geophysical survey at Canterno Lake, near Fiuggi (Central Italy); in this case we used EM57 transmitter and a multi-turn 4 x 4 m loop put on a floating wooden frame, while the receiver system and the transmitter were placed on two different rubber boats. So it was possible to execute soundings on the water table. TDEM soundings were performed on land as well.

These three maps show the contouring of apparent resistivity registered by the 1st, 4th and 6th channel; they correspond respectively to about 20-30, 50-60 and 80-100 m depth of exploration; you can notice the progressive widening of the resistive zone (in red) towards north-east.

The contact with the conductive zone (in blue) is very sharp and is NW-SE oriented, according to the typical Appennine pattern. So it is possible to detect a direct fault which uplifted the carbonate unit (the resistor) and which brings into contact limestones with turbidites (the conductor).

It is interesting to notice that a natural karstic well is located just along this fault detected by geophysics, and that this fault seems to be the extension of an outcropping one detected by geological survey.