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Albarello D. Francescone M. Lunedei E. Paolucci E. Papasidero M. P. Peruzzi G. Pieruccini P. 《Natural Hazards》2016,86(2):401-416
We present a field procedure that has been extensively used in Italy to characterize local seismic response at accelerometric sites and to retrieve ground motion at reference soil conditions by deconvolution analysis. To allow a generalized application to large areas where borehole data are generally lacking or inadequate for the seismic characterization for soils down to the reference seismic bedrock, cost-effectiveness of the considered procedures is a main issue. Thus, major efforts have been devoted to optimize available information and exploit fast and cheap surface geophysical prospecting. In particular, geological/geomorphological survey and passive seismic prospecting (both in single- and multi-station configurations) were jointly considered to reconstruct seismo-stratigraphical site conditions. This information was then used to feed numerical modeling aiming at computing the local seismic response and performing a deconvolution analysis to reconstruct ground motion at reference soil conditions. Major attention was devoted to evaluate and manage uncertainty involved in the procedure and to quantify its effect on final outcomes. An application of this procedure to a set of sites included in the Italian Accelerometric Network is presented.
相似文献2.
Sebastiano Foti Fabrice Hollender Flora Garofalo Dario Albarello Michael Asten Pierre-Yves Bard Cesare Comina Cécile Cornou Brady Cox Giuseppe Di Giulio Thomas Forbriger Koichi Hayashi Enrico Lunedei Antony Martin Diego Mercerat Matthias Ohrnberger Valerio Poggi Florence Renalier Deborah Sicilia Valentina Socco 《Bulletin of Earthquake Engineering》2018,16(6):2367-2420
Surface wave methods gained in the past decades a primary role in many seismic projects. Specifically, they are often used to retrieve a 1D shear wave velocity model or to estimate the VS,30 at a site. The complexity of the interpretation process and the variety of possible approaches to surface wave analysis make it very hard to set a fixed standard to assure quality and reliability of the results. The present guidelines provide practical information on the acquisition and analysis of surface wave data by giving some basic principles and specific suggestions related to the most common situations. They are primarily targeted to non-expert users approaching surface wave testing, but can be useful to specialists in the field as a general reference. The guidelines are based on the experience gained within the InterPACIFIC project and on the expertise of the participants in acquisition and analysis of surface wave data. 相似文献
3.
Domenico Pileggi David Rossi Enrico Lunedei Dario Albarello 《Bulletin of Earthquake Engineering》2011,9(6):1839-1854
The problem of seismic characterization of rock-mass or stiff-soil outcrops by the use of passive seismic prospecting techniques
is discussed. Difficulties in the application of this kind of procedure in the presence of rugged morphology, high surface
wave velocities and low ambient vibration powers, typical of stiff-soil/rock-mass sites are examined. A methodology to face
these problems is here proposed, which is based on the strict synergy of detailed geologic surveys and application of robust
seismic prospecting techniques, jointly considering single-station and multi-station tools. The application of this approach
for the characterization of a number of sites belonging to the Italian Accelerometric Network is described, focusing on two
representative case histories. 相似文献
4.
D. Albarello M. Francescone E. Lunedei E. Paolucci M. P. Papasidero G. Peruzzi P. Pieruccini 《Natural Hazards》2017,86(2):401-416
We present a field procedure that has been extensively used in Italy to characterize local seismic response at accelerometric sites and to retrieve ground motion at reference soil conditions by deconvolution analysis. To allow a generalized application to large areas where borehole data are generally lacking or inadequate for the seismic characterization for soils down to the reference seismic bedrock, cost-effectiveness of the considered procedures is a main issue. Thus, major efforts have been devoted to optimize available information and exploit fast and cheap surface geophysical prospecting. In particular, geological/geomorphological survey and passive seismic prospecting (both in single- and multi-station configurations) were jointly considered to reconstruct seismo-stratigraphical site conditions. This information was then used to feed numerical modeling aiming at computing the local seismic response and performing a deconvolution analysis to reconstruct ground motion at reference soil conditions. Major attention was devoted to evaluate and manage uncertainty involved in the procedure and to quantify its effect on final outcomes. An application of this procedure to a set of sites included in the Italian Accelerometric Network is presented. 相似文献
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Alternative interpretations of horizontal to vertical spectral ratios of ambient vibrations: new insights from theoretical modeling 总被引：2，自引：1，他引：1
Different positions exist about the physical interpretation of horizontal to vertical spectral ratios (HVSR) deduced from
ambient vibrations. Two of them are considered here: one is based on the hypothesis that HVSR are mainly conditioned by body
waves approaching vertically the free surface, the other one assumes that they are determined by surface waves (Rayleigh and
Love, with relevant upper modes) only. These interpretations can be seen as useful approximations of the actual physical process,
whose reliability should be checked case-by-case. To this purpose, a general model has been here developed where ambient vibrations
are assumed to be the complete wave field generated by a random distribution of independent harmonic point sources acting
at the surface of a flat stratified visco-elastic Earth. Performances of the approximate interpretations and complete wave
field models have been evaluated by considering a simple theoretical subsoil configuration and an experimental setting where
measured HVSR values were available. These analyses indicate that, at least as concerns the subsoil configurations here considered,
the surface-waves approximation seems to produce reliable results for frequencies larger than the fundamental resonance frequency
of the sedimentary layer. On the other hand, the body waves interpretation provides better results around the resonance frequency.
It has been also demonstrated that the HVSR curve is sensitive to the presence of a source-free area around the receiver and
that most energetic contribution of the body waves component comes from such local sources. This dependence from the sources
distribution implies that, due to possible variations in human activities in the area where ambient vibrations are carried
on, significant variations are expected to affect the experimental HVSR curve. Such variations, anyway, only weakly affect
the location of HVSR maximum that confirms to be a robust indicator (in the range of 10%) of the local fundamental resonance
frequency. 相似文献
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