IDENTIFICATION AND INVESTIGATION OF SHALLOW PALEOCHANNELS IN THE CHAMELECON VALLEY (HONDURAS): 1D VS 2D ELECTRICAL RESISTIVITY SURVEYS

• DOI: 10.4133/sageep2013-112.1
• Publication Date: 2015-01-21T14:05:27Z
• Authors: Patrizio Torrese; Mario Luigi Rainone; Fabio Colantonio; Patrizio Signanini
• Keywords: Vertical electrical sounding; Electrical Resistivity Tomography

Electrical Resistivity Tomography (ERT) and resistivity depth sounding surveys were undertaken at two sites located along the Chamelecòn Valley (Honduras). The objective of was to determine occurrence, geometry lithological properties River's shallow paleochannels. Following interpretation aerial photograms which indicated likely presence paleochannels, selected for surveys. soundings used achieve electro-stratigraphic sections obtained by interpolating 1D inverted data that would assist with assessing occurrence paleochannels a large scale. assessed through sections. At Site 2, abundant data, small distance between target, allowed determining course paleoriver as shown electrical transmissivity maps. results from although affected strong heterogeneities, are congruent 2D models. ERT confirmed achieving detailed imaging alluvial geological bodies. Paleochannel deposits show values ranging 70 100 ohm m 1, while range 90 120 2. latter coarser deposits. suggest both paleochannel have clay content is lower than 3 %. Other in area 19 30 These can be high 29 means characterisation logs boreholes drilled sites.