Geophysical surveys for the characterization of the seismic local response at instrumented sites: a case study from a station of the Swiss strong motion network
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Date
2022-09
Publication Type
Conference Paper
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yes
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Abstract
Site characterization surveying is one of the key efforts for the understanding of local amplification effects in earthquake engineering. In this perspective, geophysical measurements for the estimation of the physical properties of the subsurface at instrumented sites are particularly important. For instance, the comparison between simulated site amplification based on the retrieved Vs profile and empirical local response observed at the station allows assessing whether the site is characterized by a purely 1D response or additional 2D-3D effects are present. We present a case study involving a site characterization measurement at a station of the Swiss strong-motion network. The survey includes active seismic data acquisition along two geophone lines, of 15 and 115 m length, for the imaging of the near-surface and deeper layers, respectively. The acquired data were interpreted in terms of P-wave refraction and Rayleigh-wave multi-modal propagation analysis. The reconstructed Vs-Vp profiles achieve a high level of accuracy over a wide depth range and allow modelling the SH-transfer function of the local soil column; the latter is in excellent agreement with the local amplification function estimated by means of empirical spectral modelling of the station’s recordings. The agreement confirms a purely 1D site response for the surveyed station.
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Publication status
published
External links
Book title
Proceedings of the Third European Conference on Earthquake Engineering and Seismology – 3ECEES
Journal / series
Volume
Pages / Article No.
4765 - 4774
Publisher
Editura Conspress
Event
3rd European Conference on Earthquake Engineering and Seismology (3ECEES 2022)
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Seismic site response; geophysical surveys; wavefield decomposition; strong-motion station; empirical spectral modelling
Organisational unit
02818 - Schweiz. Erdbebendienst (SED) / Swiss Seismological Service (SED)