<abstract xmlns="http://www.w3.org/1999/xhtml"><p> 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.</p></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.

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

Lagos state University, Department of Physics, Lagos,

University of Lagos, Department of Geosciences, Akoka, Lagos,

University of Lagos, Department of Physics, Akoka, Lagos,

Materials and Geoenvironment

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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...

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

Published Online: Oct 26, 2016

Page range: 81 - 90

Received: May 11, 2016

Accepted: Jun 16, 2016

DOI: https://doi.org/10.1515/rmzmag-2016-0007

Keywords
multichannel analysis of surface waves (MASW), weakening of structures, rigidity modulus, standard penetration test (SPT), N-value, subsidence

© 2016

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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

Published Online: Oct 26, 2016

Page range: 81 - 90

Received: May 11, 2016

Accepted: Jun 16, 2016

DOI: https://doi.org/10.1515/rmzmag-2016-0007

Keywordsmultichannel analysis of surface waves (MASW), weakening of structures, rigidity modulus, standard penetration test (SPT), N-value, subsidence

© 2016

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
multichannel analysis of surface waves (MASW), weakening of structures, rigidity modulus, standard penetration test (SPT), N-value, subsidence