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Investigation of near-surface structures using seismic refraction and multi-channel analysis of surface waves methods—a case study of the University of Lagos main campus

  • Olawale Johnson AlloEmail author
  • Elijah Adebowale Ayolabi
  • Sunday Oladele
Review Paper
  • 44 Downloads

Abstract

The need to use locations which are hitherto swamps or recreation centers to construct more building facilities that range from medium to huge structures within the University main campus informed the decision to embark on this study. Structures within the subsurface layers were investigated by analyzing the distribution pattern of some geophysical properties such as compressional wave (P-wave) velocity, shear wave (S-wave) velocity, and Poisson ratio. The near-surface layers were identified from the first break picks of P-waves velocities. Moreover, the dispersive capability of the surface wave produced S-wave velocity information that identified different geological structures based on the orientations of the lithological layer’s rigidity. The P-wave velocities reveal three-layer structures of thicknesses between 3.0 m to 6.0 m and 2.0 m to 5.0 m for Layer 1 and Layer 2 respectively. These layers are in three categories of “Complex”, “Mild,” and “Simple” based on the distribution pattern of shear velocities. Poisson ratio analysis shows two categories of Topsoil/Lateritic layer of less than 2.0 m (thin) and between 2.0 m and 4.5 m (thick). Areas identified as “Complex” structure with thick Topsoil will require comprehensive foundation design than other areas especially when erecting huge building. Whereas, locations around the New Halls (NHs) may require simple foundation plan for building development compared to other areas since it is characterized by thin Topsoil and simple layer structure. The study will assist construction engineers with prior information of the structures of subsurface layers which thereby reduce time and cost of building development within the University campus.

Keywords

P-velocity S-velocity Poisson ratio Surface waves Subsurface structures 

Notes

Acknowledgments

The authors appreciate the Department of Geosciences, University of Lagos, for the release of the 24 channel ABEM seismograph used to acquire the seismic data for this study.

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  • Olawale Johnson Allo
    • 1
    Email author
  • Elijah Adebowale Ayolabi
    • 1
  • Sunday Oladele
    • 1
  1. 1.Department of Geosciences, Faculty of ScienceUniversity of LagosLagosNigeria

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