The Crustal Structure of Landmark University and OMU-ARAN Environment, Nigeria, using High-Resolution Aeromagnetic Data

Abstract

The areas of crustal structures have been delineated using high-resolution aeromagnetic data (HRAD) over Landmark University and its environs with a view to identifying the zones of weakness and high groundwater potential zones in Landmark University and Omu-Aran environs. Local subsurface structures' positions and depths were determined using a combination of methods, including filtered horizontal gradient magnitude (HGM), first vertical derivative (FVD), and Euler deconvolution (ED). After identifying geological lineaments in the study's area, a frequency rose diagram of lineament orientations was created. The crustal structures at Landmark University were extracted using the defined geological lineament map. The study area's fault zones and depths of occurrence were identified using the Euler deconvolution method, which showed non-uniform depth distribution of the faults/fractures, ranging from shallow depths <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$(&lt; 100 \ m)$</tex> to deeper zones <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\boldsymbol{(&gt; 1000 \ m)}$</tex> . The results obtained revealed that several crustal structures, with dominant trends in the ENE-WSW and NE-SW directions, exist in the study area. Additionally, the results showed evidence of subsurface geological structures at Landmark University. However, most buildings in the University are sited in geologically safe zones. This study concluded that the subsurface of Landmark University and Omu-Aran environs consists of crustal structures, whose locations are zones of weakness and groundwater potential zones that should be avoided when siting new buildings but should be targeted while prospecting for groundwater in the area.