GNGTS 2019 - Atti del 38° Convegno Nazionale

GNGTS 2019 S essione 3.2 623 Initial data analysis shows how the artificial potentials, using 2 transmitters, could be considered readable almost along the entire survey line. At few spots the signal lowers below 0.5 mV and it appears to be covered by the site noise. The use of 4 transmitters resulted in a dramatic improvement in the signal levels. The artificial potentials are now readable along the entire survey line showing values as high as 0.5 mV also at larger geometric factors. The measured potentials, based on these first results could be considered reliable down to values of fractions of mV indicating how this new system has important potentials to be exploited. The MultiSource approach is then capable of providing substantial improvements in both depth of penetration and resolution over conventional approaches. References Bohm, G., Francese, R., and Giorgi, M., 2014, 3D Geophysical Model of the Vajont Rockslide from Seismic and Geoelectric Surveys, EAGE - 20th European Meeting of Environmental and Engineering Geophysics, WE OLYM 05, DOI: 10.3997/2214-4609.20142052. Bistacchi, A., Massironi, M., Superchi, L., Zorzi, L., Francese, R., Giorgi, M., Chistolini, F. and Genevois, R. [2013] A 3D geological model of the 1963 Vajont landslide. Italian Journal of Engineering Geology and Environment, BS6, 531-540. Francese, R., Giorgi, M., Böhm, G., Bistacchi, A., Bondesan, A., Massironi, and Genevois, R., 2013, 3D Geophysical imaging of the Vajont landslide and of its surroundings, Italian Journal of Engineering Geology and Environment, BS6, 555-565, DOI: 10.4408/IJEGE.2013-06.B-53. LaBrecque, D.J., Morelli, G., Fischanger, F., Lamoureux, P. and Brigham, R., 2013, Field Trials of the Multi-Source Approach for Resistivity and Induced Polarization Data Acquisition, American Geophysical Union, Fall Meeting 2013, abstract id. NS34A-03. LaBrecque, D.J., Casale, D., Brigham, R., and Flinchum, B., 2013, AMulti-Source approach for electrical resistivity tomography, Symposium on the Application of Geophysics to Engineering and Environmental Problems 2013, DOI: 10.4133/sageep2013-230.1. Picotti, S., Francese, R., Giorgi, M., Pettenati, F., and Carcione, J.M., 2017, Estimation of glacier thicknesses and basal properties using the horizontal-to-vertical component spectral ratio (HVSR) technique from passive seismic data. Journal of Glaciology, 63, 238, 229–248, DOI: 10.1017/jog.2016.135. Fig. 3 - Voltages measured with the passive array using 2 transmitters (above) and 4 transmitters (below).