P052 Nondestructive DC Resistivity Surveying Using Flat Base Electrodes Abstract 1 E. ATHANASIOU P. TSOURLOS G. TSOKAS C. PAPAZACHOS and G. VARGEMEZIS Deparment of Geophysics School of Geology Aristotle University of Thessaloniki 54124 Thessaloniki Greece. In this work the application of flat base electrodes in performing geoelectrical measurements is examined. This study is motivated by the inability to apply geoelectrical techniques in environments where it is not possible to insert conventional electrodes. The performance of flat base electrodes is examined in various environments using different measuring modes and proved to be working satisfactorily in most cases producing data almost identical