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Ground Motion and Site Effects

EUROSEISTEST experimental site allows the performance of integrated research studies in many fileds related to ground motion and site effects through its 3D permanent accelerometric array, the complete knowledge of the soil stratigraphy and the dynamic properties  as well as with its various other facilities including the permanent seismological network which is covering the whole area. It generates high quality set of data which will be disseminated in the international scientific community. The main target is to improve our fundamental knowledge on ground motion, wave propagation and site effects and thus to draw generalised conclusions that may highlight potential code implications.

The specific objectives of Euroseisrisk project are:

            Analysis of experimental data

bulletAnalysis of all existing from previous experiments as well as new data from the permanent and the temporary networks in the frequency and time domain (phases, duration etc)
bulletStudy of the spatial variabiliy of ground motion, F-K spectra, loss of coherency, differential motion, azimuthal and directivity effects.
bulletStudy of non-linear phenomena of ground response and liquefaction
bulletUse of the recordings obtained to define the 3D geometry of the basin and the location of the geological and tectonical discontinuities from the inversion of P,S, and surface waves.

          Theoretical studies

bulletPerform numerical and analytical studies of source mechanism and ray path modelling
bulletCompare all available models and and numerical tools for ground response analysis (1D,2D,3D, linear elastic, equivalent linear, non-linear, elastoplastic, finite element, finite difference, boundary element methods) with recorder motions in the temporary and permanent arrays in order to validate their accuracy.
bulletDevelop new modes or/and improve existing ones esspecially in the case of complex soil structures with important lateral discontinuites and very soft-loose surface materials where soil liquefaction is probable.
bulletValidate various models for spatial variability of ground motion with well constrained data
bulletDevelop Green's function for elastic waves in unbounded random medi, which could be used in BEM solutions to wave scattering problems.
bulletPerform specific parametric studies aiming to the improvement of specific code prescriptions regarding site characterisation and seismic design motions.

The following figures illustrate few examples of past studies in Euroseistest site. Detailed descriptions may be found in numerous publications.

 

 

Seismic section computed (low-pass filtered & anelastic attenuation) at the surface of the 2D model.
 
 
Theoretical transfer function obtained from the synthetics
 
Comparison between filtered seismograms (trans-versal component) and synthetics with respect to the cross-section.
 
 
Amplification factors of five resonant frequencies (0.7-2.5Hz) with respect to the cross-section and 1D amplification factors (bullets)
 

 

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 Copyright 2003-2004 by Aristotle University Thessaloniki, Dept. of Civil Eng., Lab. of Soil Mechanics and Foundation Eng.. All rights reserved.
Last Update: 27/02/04.