Vincent Perron

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Perron

First Name

Vincent

ORCID

0000-0003-0283-7843

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Publications1 - 10 of 38

URBASIS Deliverable: General guidelines to assess soil response in urban areas
Janusz, Paulina; Fäh, Donat; Perron, Vincent (2021)
Evaluation of the variability of soil response in urban environment using reference-site methods: the case of Lucerne, Switzerland
Janusz, Paulina; Perron, Vincent; Knellwolf, Christoph; et al. (2020)
Abstract Volume 18th Swiss Geoscience Meeting
Can site effects be estimated with respect to a distant reference station? Performance of the spectral factorization of coda waves
Grendas, Ioannis; Theodoulidis, Nikolaos; Bard, Pierre-Yves; et al. (2022)
Geophysical Journal International
The reliability of the ground motion simulation is highly dependent on the quality of the site response (or site effects) evaluation. There are several methods to estimate the Site Amplification Factor (SAF) corresponding to Fourier Amplitude Spectra (FAS), either by using numerical simulation tools or empirical approaches. A widely used empirical method is the ‘Standard Spectral Ratio’ (SSR) technique based on the FAS ratio of the seismic record at a target site to the corresponding one at a nearby amplification-free ‘rock’ site (reference site). The main limitation of this method lies in the availability of a reference site relatively close to the target one. In this study a SAF estimation technique at a target site in relation to a distant reference site is presented and evaluated. This technique is based on the retrieval of the minimum phase Source Time Function (mpSTF) at a pair of examined sites (target-reference), with the Spectral Factorization analysis of Coda waves (SFC) proposed by Sèbe et al. The so derived mpSTF are considered as a convolution of the actual source function, and of the SAF, so that the FAS ratio of the mpSTF, derived at one site (target) and at a distant reference site, should be an estimate of the target SAF. The latter is confirmed in this study. Under the conditions of a common STF at the examined sites and of similar coda waves excitation factor, the ratio of the FAS of the mpSTFs (target over reference site) can safely approach the actual SAF, at least when target-reference distance is up to ∼60 km and provides encouraging results at longer distances. This technique was applied at 24 sites in western Greece in relation to 4 reference sites located at varying distances from the target ones (from 0.4 to 110 km). More than 700 STFs were calculated for 89 moderate magnitude earthquakes (3.9 ≤ M ≤ 5.1) located in this high seismicity area and SAFs were determined from each pair of target-reference stations using common seismic sources. Finally, the average SAFs were computed and compared to the ones computed by other methods (e.g. SSR, GIT and HVSR) demonstrating the reliability and robustness of the proposed technique in site effect estimation.
RESIF RAP and RLBP Dataset of Earthquake Ground Motion in Mainland France
Traversa, Paola; Maufroy, Emeline; Hollender, Fabrice; et al. (2020)
Seismological Research Letters
This work presents the implementation of a high standards dataset of earthquake ground motions recorded in Metropolitan France between 1996 and 2016. This dataset is intended to serve the scopes of a large seismological community; however, its primary aims are engineering seismology and earthquake engineering applications. The dataset includes records from broadband and accelerometric sensors provided by permanent and temporary seismic networks operated by French research institutions and partners grouped within the Réseau Sismologique et géodésique Français (RESIF) consortium (see Data and Resources). All the waveforms are first homogenized to acceleration units and underwent a full quality control process including: (1) visual verification and manual phase picking, (2) processing scheme, and (3) consistency check by residual analysis. These make the dataset fully compliant with international standards. Finally, the RESIF dataset includes more than 6500 quality‐checked records from 468 earthquakes recorded at 379 stations. Over the 379 stations included in the dataset, 177 are permanent stations (RA and FR networks) and 202 are temporary stations (YP and X7 networks). The dataset is complete down to magnitude ML 3.5 over the whole French territory and less (about ML 2.5) in the eastern part. Magnitudes range from ML 2.4 to 5.6 and from Mw 2.0 to 5.2, whereas distances range from less than 1 to 600 km. The disseminated dataset is constituted of (1) a versioned flatfile containing the metadata and main intensity measures computed on each processed record, (2) time histories, and (3) response spectra for several damping values and Fourier spectra. © 2020 Seismological Society of America.
A site amplification model for Switzerland based on site-condition indicators and incorporating local response as measured at seismic stations
Bergamo, Paolo; Fäh, Donat; Panzera, Francesco; et al. (2023)
Bulletin of Earthquake Engineering
The spatial estimation of the soil response is one of the key ingredients for the modelling of earthquake risk. We present a ground motion amplification model for Switzerland, developed as part of a national-scale earthquake risk model. The amplification model is based on local estimates of soil response derived for about 240 instrumented sites in Switzerland using regional seismicity data by means of empirical spectral modelling techniques. These local measures are then correlated to continuous layers of topographic and geological soil condition indicators (multi-scale topographic slopes, a lithological classification of the soil, a national geological model of bedrock depth) and finally mapped at the national scale resorting to regression kriging as geostatistical interpolation technique. The obtained model includes amplification maps for PGV (peak ground velocity), PSA (pseudo-spectral acceleration) at periods of 1.0, 0.6 and 0.3 s; the modelled amplification represents the linear soil response, relative to a reference rock profile with VS30 (time-averaged shear-wave velocity in the uppermost 30 m of soil column) = 1105 m/s. Each of these amplification maps is accompanied by two layers quantifying its site-to-site and single-site, within event variabilities, respectively (epistemic and aleatory uncertainties). The PGV, PSA(1.0 s) and PSA(0.3 s) maps are additionally translated to macroseismic intensity aggravation layers. The national-scale amplification model is validated by comparing it with empirical measurements of soil response at stations not included in the calibration dataset, with existing city-scale amplification models and with macroseismic intensity observations from historical earthquakes. The model is also included in the Swiss ShakeMap workflow.
Mapping site amplification with the dense recording of ambient vibration for the city of Lucerne (Switzerland): comparison between two approaches
Janusz, Paulina Agnieszka; Panzera, Francesco; Bergamo, Paolo; et al. (2025)
Bulletin of Earthquake Engineering
Reliable site-specific amplification information can be retrieved using earthquake-based methods that involve the deployment of a permanent (or temporary) network of seismic recording stations. Such an endeavour may need to operate for years, especially within regions of high risk but low recurrence rates in seismic activity. Hence, time- and cost-effective approaches using ambient vibrations are gaining popularity. Among such techniques, the canonical correlation approach (CC) collates measured empirical amplification with its indicator computed from ambient vibrations (i.e. horizontal-to-vertical spectral ratios) for a training set of seismic stations, to predict site response at locations without earthquake recordings. Another method, the hybrid standard spectral ratio method (SSRh) takes advantage of simultaneous recordings of ambient vibrations that are adjusted using earthquake ground motion data using a limited number of instrumented sites to estimate local seismic soil response. We apply both methods in the Lucerne area (Switzerland), which is located on a soft sedimentary basin, and obtain consistent results that are comparable to amplification estimates derived solely from earthquake ground motion data. These results show significant linear amplification factors (8–10 or more) at the fundamental frequency of resonance of the sediments (0.8–2 Hz). However, both techniques show systematic differences in the spatial and frequency domains. The CC method tends to underestimate the amplification at the fundamental frequency, while the SSRh technique predicts higher amplification in the centre of the basin and lower amplification at the basin edges in comparison to the CC approach. The study discusses the impact of the limitations in the completeness of the calibration dataset, and variability introduced by the choice of the shear wave velocity model of the shallow subsurface and inelastic behaviour treatment for the CC method, as well as the influence of the measurement setup for the SSRh method.
Estimating local empirical site amplification model for city of Lucerne in Switzerland
Janusz, Paulina; Perron, Vincent; Knellwolf, Christoph; et al. (2022)
Combining recordings of earthquake ground-motion and ambient vibration analysis to estimate site response variability in the city of Lucerne, Switzerland
Janusz, Paulina; Perron, Vincent; Knellwolf, Christoph; et al. (2021)
EGUsphere
Quantification of Distributed Acoustic Sensing Data Fidelity
Edme, Pascal; Paitz, Patrick; Nap, Ana; et al. (2020)
AGU Fall Meeting Abstracts
Insight on the use of canonical correlation to predict site amplification: application to the Japanese KiK-net network
Panzera, Francesco; Bergamo, Paolo; Perron, Vincent; et al. (2022)
Proceedings of the Third European Conference on Earthquake Engineering and Seismology – 3ECEES
Site specific seismic hazard assessment needs a ground motion amplification model of the investigated region. This model allows to highlight areas that can be strongly affected by earthquake ground motion, which is a crucial information for earthquake mitigation. Site response can be investigated by using technique such as standard spectral ratio, empirical spectral modelling or indirectly through analysis of horizontals-to-vertical spectral ratio (HVSR). The first two techniques are the most powerful, as they allow to retrieve the amplification function of the investigated site by using earthquake recordings, but they require a long observation time to record a sufficient number of events. The HVSR method is instead a simplified method based on the ambient vibration recordings or earthquake recordings. The HVSR is generally used to retrieve mainly the fundamental frequency of the site, while its amplitude as a function of frequency is not considered as directly representative of the site amplification. Here, we apply a method based on the statistical technique of the canonical correlation (CC) to link the amplitudes of HVSR and the earthquake site response. We test this approach on the measured amplification functions at 428 seismic stations of the Japanese KiK-net network. We show that the estimated CC coefficients can be used to reconstruct the expected amplification function at sites where only HVSR is available.

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Vincent Perron

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