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Ground Motion and Site Effects
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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
 | Analysis 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) |
| Study of the spatial
variabiliy of ground motion, F-K spectra, loss of coherency, differential
motion, azimuthal and directivity effects. |
| Study of non-linear
phenomena of ground response and liquefaction |
| Use 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
| Perform numerical and
analytical studies of source mechanism and ray
path modelling |
| Compare 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. |
| Develop 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. |
| Validate various
models for spatial variability of ground motion with well constrained data
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| Develop Green's
function for elastic waves in unbounded random medi, which could be used
in BEM solutions to wave scattering problems. |
| Perform specific
parametric studies aiming to the improvement of specific code
prescriptions regarding site characterisation and seismic design motions.
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The following figures
illustrate few examples of past studies in Euroseistest site. Detailed
descriptions may be found in numerous publications.
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Seismic section computed (low-pass filtered
& anelastic attenuation) at the surface of the 2D model.
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Theoretical transfer function obtained from
the synthetics
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Comparison between filtered seismograms (trans-versal
component) and synthetics with respect to the cross-section.
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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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