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Bulletin of the Seismological Society of America; June 1998; v. 88; no. 3; p. 862-873
© 1998 Seismological Society of America
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EURO-SEISTEST strong-motion array near Thessaloniki, Northern Greece: A study of site effects

P. P. Dimitriu, Ch. A. Papaioannou and N. P. Theodulidis

Institute of Engineering Seismology and Earthquake Engineering, P.O. Box 53 Finikas, GR-55102 Thessaloniki, Greecepedim{at}quake.itsak.gr

Abstract

The effects of local geology on the characteristics of strong ground motion have been, and continue to be, a field of active research. Despite the considerable efforts made so far, there are still several unresolved and controversial issues remaining. In particular, debates still continue over the limits of applicability of one-dimensional (1D) wave-propagation models. There are also unresolved questions related to the implementation and reliability of site-response estimation techniques such as the standard spectral ratio (SSR) and the horizontal-to-vertical spectral ratio (HVSR). This study addresses these issues on the basis of data from the EURO-SEISTEST strong-motion array at Volvi, near Thessaloniki, Greece. The data set used consists of accelerograms of 32 earthquakes, almost exclusively local, covering a magnitude range from ML 2.0 to 6.1. The range of recorded accelerations is 0.001 – 0.042 g.

We implement two 1D wave-propagation models (the Haskell-Thompson matrix method and Kennett's reflectivity-coefficient method) and the HVSR site-response assessment technique. We test the applicability of the 1D models in a basin environment. We use both Fourier-amplitude and response spectra to compute HVSR and investigate how HVSR is influenced by the choice of the time window and smoothing procedure.

We found the HVSR technique and 1D SH-wave modeling to perform reasonably well in a sediment-valley environment (the modeling was performed for a site in the center of the valley).




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R. R. Castro, F. Pacor, D. Bindi, G. Franceschina, and L. Luzi
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Bulletin of the Seismological Society of America, April 1, 2004; 94(2): 576 - 590.
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Verification of Horizontal-to-Vertical Spectral-Ratio Technique for Estimation of Site Response Using Borehole Seismographs
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