Correlation of Dry Season and Wet Season Geoelectrical Values for the ABEM Terrameter SAS 4000 at Coincident Points of Measurements

Abstract

Workers have been engaged in year-round, all-season geoelectrical surveys at the Minna Area, which is Basement Complex in nature, and the terrameter of choice in these endeavours is the ABEM Terrameter SAS 4000. Questions have arisen whether the results of surveys carried out in the rainy season differ appreciably from those carried out in the dry season for coincident points at corresponding depths. From a database of vertical electrical sounding (VES) results for a 2 km x 2 km survey at the Gidan Kwano Campus, Federal University of Technology, Minna, the analysis here is basically restricted to six survey stations of the first cross-profile (or TT1); P1-1, P1-3, P1-5, P1-7, P1-9, and P1-11 are separated by 200 m, alternating over the even-numbered station designation. Over the period (2011, 2013, and 2014) for which the data presented herein for the present analysis was acquired, the workers stuck to field survey fidelity involving the Schlumberger array in the acquisition of the VES data; moreover, no component of the ABEM Terrameter SAS 4000 was altered over this period. Thus, for the information available from this preliminary analysis, it would be concluded that, statistically, the resistivity values computed as a result of surveying with the ABEM Terrameter SAS 4000 over the dry and the wet seasons agree fairly well with each other at coincident points of survey.