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A FEW WORDS ABOUT THE INSTALLATION
The recording station is situated in a rural area outside Volos, Magnesia, Greece. The initial installation consisted of one electric dipole, approximating the North-South direction. Two boreholes were used as electrodes, each placed 36 meters underground. The distance between the electrodes was 110 meters. Picture 4 shows the electrode installation in detail.
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Picture 4
The link between the electrodes and the recording station consisted of two coaxial cables. They were followed by a differential amplifier and a low pass filter, F<0,2Hz.
Recently, there have been improvements in the installation. It now consists of two electric dipoles set at right angles; a third borehole was added to the first two. The length of the dipoles has remained the same. Picture 5 shows the arrangement of the electrodes in the area of the installation.
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Picture 5
The two dipoles are electrically independent from each other. Each is led into a different processor units via different entrance. Each unit consists of a low pass filter (F<0,2Hz) and a band pass filter recording data for an approximate period of 24 hours. A computer follows the above arrangement where all recordings are stored in digital form - this was also the case of the previous installation.
