Interconnection of electrical resistivity tomography and borehole records for subsurface lithologies and geological structures study

Urbanization calls for constructions of infrastructures in accommodating the growing number of people as well as providing sufficient safety, waste management, transportation, and other services.Developing areas always require ground investigation to analyze both ground conditions and subsurface structures prior to any establishment to map the subsurface and identify any presence of geological formations that could hinder construction processes.Subsurface cavity is one of the most concerning geological formations in urban areas, making the key objective of this study is to also detect any presence of subsurface cavity.Electrical resistivity tomography (ERT) was utilized in the study, along with borehole record to verify the geophysical results with physical data.Pole-dipole array was employed in the investigation due to its benefit of deeper penetration as compared to other arrays without losing significant data resolution required in this study.From the ERT results and borehole records, the lithologies were categorized into two separate layers: overburden silt and fractured sandstone bedrock.The study area was inferred to require overburden layer reinforcement prior to construction processes to ensure the safety of workers and future infrastructures in the area.