Awuah, B.2023-11-082023-11-082021-12http://ugspace.ug.edu.gh:8080/handle/123456789/40753MPhil. Applied GeophysicsThis study was undertaken in Accra over an abandoned landfill site on which the authorities of Apenkwa Presbyterian Basic School desire to build a school facility. Obtaining information about the ground condition of the study site to support the intended architectural design is crucial. The main objective of this study is therefore, to investigate the ground stiffness and depth to bedrock of the study site using the Multichannel analysis of surface waves (MASW) technique. Acquiring subsurface information using the MASW procedure is grouped into three phases: acquiring data from the field, extracting the fundamental mode dispersion curve, and inversion of dispersion curve. The inversion of the dispersion curve provides a 1-dimensional (1D) velocity profile that is a representative of the subsurface where a geophone on the surface picked a response of the source energy generated. Several 1D velocity profiles that make up a traverse line were stacked to produce a 2-dimensional (2-D) Vs profile. From the processed field data, it was observed that, the surveyed site has a shear wave velocity (Vs) ranging between 340m/s and 1925m/s. The Vs velocity showed five distinct clear cutting wide ranges. The shear wave velocity at a depth of 30m (Vs30) gave a least value of 350m/s and a maximum value of 1400m/s. From this information, it was concluded that, the study site has at least five different stratigraphic layers at a maximum depth of 30m. The bedrock of the site is estimated to a depth of 25 m representing deep-seated bedrock. The Vs30 information obtained suggests that the site falls under category B and category C of the National Earthquake Hazards Reduction Program (NEHRP) Soil Profile Type Classifications.enGround StiffnessMultichannel AnalysisBed rock investigationsAccraThesis