170 Geophysics in Geothermal Exploration The survey design phase is followed by the subsequent field preparation. It took one day to indicate on the field the future location of injection and receiving electrodes using a wooden sticks. This helps the subsequent deployment of the units and avoid any error (Figure 5.4). Figure 5.4 Receiver box deployed at the wooden stick location. The data acquisition campaign was completed in 2 days, including retrieval of equipment, by a team of 12 people, adequately trained. 5.3.3 Acquisition layout The acquisition was carried out by arranging the receiving (green) and transmitting (red) electrodes according to the design shown in Figure 5.5. The survey involved the arrangement of a 5.5 km long central transmission axe (from TX1 to TX23, in yellow in Figure 5.5), necessary to be able to achieve a depth of 800-900 meters. Other injection dipoles are positioned in the area of interest. These smaller dipoles (in white), located close to the receiver units (green dots), are designed to improve near-surface resolution. The field team deployed 34 reception boxes each one connected to three electrodes (in detail in Figure 5.6) according to the design previously described. The size of each receiving dipoles is 50 meters (P1-P2 = 50 m, P2-P3 = 50m). A total of 102 receiving electrodes has been set up.
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