A comparative study of surface waves inversion techniques at strong motion recording sites in Greece

Panagiotis C. Pelekis, ASPETE, Civil Engineering Dept., N. Heraklion, Greece Alexandros Savvaidis, Institute of Engineering Seismology and Earthquake Engineering, Greece Vasileios S. Vlachakis, University of Patras, Civil Engineering Dept., Greece George A. Athanasopoulos, University of Patras, Civil Engineering Dept., Greece
By: , and 

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Abstract

Surface wave method was used for the estimation of Vs vs depth profile at 10 strong motion stations in Greece. The dispersion data were obtained by SASW method, utilizing a pair of electromechanical harmonic-wave source (shakers) or a random source (drop weight). In this study, three inversion techniques were used a) a recently proposed Simplified Inversion Method (SIM), b) an inversion technique based on a neighborhood algorithm (NA) which allows the incorporation of a priori information regarding the subsurface structure parameters, and c) Occam's inversion algorithm. For each site constant value of Poisson's ratio was assumed (ν=0.4) since the objective of the current study is the comparison of the three inversion schemes regardless the uncertainties resulting due to the lack of geotechnical data. A penalty function was introduced to quantify the deviations of the derived Vs profiles. The Vs models are compared as of Vs(z), Vs30 and EC8 soil category, in order to show the insignificance of the existing variations. The comparison results showed that the average variation of SIM profiles is 9% and 4.9% comparing with NA and Occam's profiles respectively whilst the average difference of Vs30 values obtained from SIM is 7.4% and 5.0% compared with NA and Occam's.

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Additional publication details

Publication type Conference Paper
Publication Subtype Abstract or summary
Title A comparative study of surface waves inversion techniques at strong motion recording sites in Greece
DOI 10.4133/SAGEEP.28-063
Year Published 2015
Language English
Publisher Society of Exploration Geophysicists
Contributing office(s) Pacific Coastal and Marine Science Center
Description 4 p.
Larger Work Type Book
Larger Work Subtype Conference publication
Larger Work Title Symposium on the Application of Geophysics to Engineering and Environmental Problems 2015
First page 452
Last page 455
Country Greece