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Evaluation of Some Part of Lagos (Nigeria) Wetland for Liquefaction Vulnerability Using Integrated Approach

  • Hamid OladunjoyeEmail author
  • Kayode Oyedele
  • Omolara Adenuga
  • Sofiat Adekoya
Conference paper
Part of the Advances in Science, Technology & Innovation book series (ASTI)

Abstract

The study aimed to assess the vulnerability of some parts of Lagos wetland towards the liquefaction phenomenon. Due to the population density of Lagos, the coastal area has been an alternative to the dwellers. The recent review of seismicity phenomena recorded within the recent years shows that the country might not be safe anymore from Earthquake related hazards such as liquefaction. Multi-channel Analysis of Surface waves (MASW) and Cone penetration testing (CPT) were carried out. Twenty-four (24) channels geophones were connected to the ABEM Mark 6 Seismograph to detect the generated seismic wave produced through active method. 10-Ton Dutch Cone Penetrometer was employed in acquiring the CPT sounding data. The shear wave velocity models generated showed the presence of loose sands with shear wave velocity value ranging from 140–180 m/s. The soil behaviour type chart showed that the sediments in the study area are sand mixtures. These sands have the soil behaviour type index (Ic) that is within the liquefiable boundary. The sediments are mainly dilative soil with low degree of fine particles. Simplified procedure showed that the depth of 4.50–16.00 m has factor of safety less than 1 which is an indication of probable liquefaction during sudden ground shaking.

Keywords

Liquefaction Lagos Wetland MASW Factor of safety 

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Hamid Oladunjoye
    • 1
    Email author
  • Kayode Oyedele
    • 2
  • Omolara Adenuga
    • 1
  • Sofiat Adekoya
    • 1
  1. 1.Department of PhysicsOlabisi Onabanjo UniversityAgo IwoyeNigeria
  2. 2.Department of GeosciencesUniversity of LagosAkoka LagosNigeria

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