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
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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.
Suggested Citation
Pelekis, P.C., Savvaidis, A., Kayen, R.E., Vlachakis, V.S., Athanasopoulos, G.A., 2015, A comparative study of surface waves inversion techniques at strong motion recording sites in Greece, in Symposium on the Application of Geophysics to Engineering and Environmental Problems 2015, p. 452-455, https://doi.org/10.4133/SAGEEP.28-063.
Study Area
| 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 |
| Publication Date | March 26, 2015 |
| 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 |