Multichannel analysis of the surface waves of earth materials in some parts of Lagos State, Nigeria

Author:

Adegbola R.B.1,Oyedele K.F.2,Adeoti L.2,Adeloye A.B.3

Affiliation:

1. Lagos state University, Department of Physics, Lagos, Nigeria

2. University of Lagos, Department of Geosciences, Akoka, Lagos, Nigeria

3. University of Lagos, Department of Physics, Akoka, Lagos, Nigeria

Abstract

Abstract We present a method that utilizes multichannel analysis of surface waves (MASW), which was used to measure shear wave velocities, with a view to establishing the probable causes of road failure, subsidence and weakening of structures in some local government areas in Lagos, Nigeria. MASW data were acquired using a 24-channel seismograph. The acquired data were processed and transformed into a two-dimensional (2-D) structure reflective of the depth and surface wave velocity distribution within a depth of 0–15 m beneath the surface using SURFSEIS software. The shear wave velocity data were compared with other geophysical/ borehole data that were acquired along the same profile. The comparison and correlation illustrate the accuracy and consistency of MASW-derived shear wave velocity profiles. Rigidity modulus and N-value were also generated. The study showed that the low velocity/ very low velocity data are reflective of organic clay/ peat materials and thus likely responsible for the failure, subsidence and weakening of structures within the study areas.

Publisher

Walter de Gruyter GmbH

Subject

Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics

Reference15 articles.

1. [1] Adegbola, R.B., Ayolabi, E. A., Allo, W. (2012): Subsurface characterization using seismic refraction and surface wave methods: a case of Lagos State University, Ojo, Lagos State. Arab J geosci. DOI 10.1007/ s12517-102-0784-2.

2. [2] Miller, R. D. Xia, J. Park, C.B. Ivanov, J. M. (1999): Multichannel analysis of surface waves to map bedrock. Leading Edge, 18 1392-96.10.1190/1.1438226

3. [3] Gucunski, N., Woods, R.D.(1991): Instrumentation for SASW testing, in Geotechnical, special publication no 29,Recent advances in instrumentation, data acquisition and testing in soil dynamics edited by K.S Bhatia and G.W. Blancy, America Society of Civil Engineers. 1-16.

4. [4] Park, C.B., Miller ,R.D., Xia, J. (1996): Multi-channel analysis of surface waves using vibroseis, paper presented at the 66th Ann. Mtg. of SEG, Denver, expanded abstract 68-71.

5. [5] Xia, J., Miller, R.D., Park, C.B. (1999): Estimation of near-surface shear-wave velocity by inversion of Rayleigh waves. Geophysics, 64 691-700.10.1190/1.1444578

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