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

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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.

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  • [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] 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.

  • [3] Gucunski N. Woods R.D.(1991): Instrumentation for SASW testing in Geotechnical special publication no 29Recent 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] 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] 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.

  • [6] Jones H.A. Hockey R.D. (1964): The geology of part of South-Western Nigeria Geological Survey of Nigeria Bulletin No 31.

  • [7] Longe E.O. Malomo S. Olorunniwo M. A. (1987): Hydrogeology of Lagos metropolis. J. Afr Earth Sci. 6(3) 163-174.

  • [8] Adeyemi (1972): Sedimentology of Lagos lagoon. Unpublished B.Sc. Thesis Obafemi Awolowo University Ife-Ife Osun State Nigeria.

  • [9] Bankole I.S. Schrank E. Erdtmann B. (2007): Palynology of the Paleogene Oshosun formation in the Dahomey basin Southwestern Nigeria. Revista Espanola de Micropaleontologia39 (1-2) 29-44.

  • [10] Socco L.V. Strobbia C. (2004): Surface wave method for near-surface characterization: A tutorial. Near- Surface Geophysics 165-185.

  • [11] Rollins K.M. Evans M.D. Diehl N.B. Daily W.D. (1998b): Shear modulus and damping relationshipsfor gravels; J. Geotech. Geoenv. Eng. ASCE 124396-405.

  • [12] OhtaY. Goto N. (1978): Empirical shear wave velocity equations in terms of characteristics soil indexes. EarthqEngStructDyn 6(2) 167-187.

  • [13] Hanumantharao C. Ramana G.V. (2008): Dynamics soil properties for microzonation of Delhi India. J. Earth Science 117(2) 719-730.

  • [14] Terzaghi K. Peck R.B. (1967): “Soil Mechanics in Engineering Practice” 2nd edition John Wiley and Sons New York. 618p.

  • [15] Borcherdt R. D.(1994):“New development in estimating site response effect on ground motion” Proc. Seminar on New development in Earthquake Ground Motion Estimation and implications for Engineering Design Practice Applied Technology Council ATC 35(1) 101-144.

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