Geoelectric Mapping for Subsurface Bedrock Identification Implications for Construction Planning at ITERA

Abstract

Sustainable infrastructure development in educational institution areas requires accurate subsurface characteristics, particularly in identifying the presence of hard rock layers for building foundations. One of the effective and non-destructive geophysical methods for this requirement is the electrical resistivity method. Therefore, geoelectric mapping measurements were carried out along two lines to identify the hard layers within the ITERA campus area. The configuration used in the mapping measurement was the Wenner-Schlumberger configuration, which is well-known for providing a balanced lateral and vertical resolution. These geoelectric measurements had minimum and maximum AB/2 values of 2 and 192 meters, respectively, to obtain an optimal imaging depth coverage. The processed geoelectric mapping data shows variations in subsurface resistivity, which is strongly suspected to be tuffaceous sandstone with high resistivity values (). This distribution of the hard layer is expected to serve as supporting data and recommendations for future physical construction planning and development within the ITERA campus environment.