Guidelines for the good practice of surface wave analysis: a product of the InterPACIFIC project

Foti, Sebastiano; Hollender, Fabrice; Garofalo, Flora; Albarello, Dario; Asten, Michael; Bard, Pierre Yves; Comina, Cesare; Cornou, Cécile; Cox, Brady R.; Giulio, Giuseppe Di; Forbriger, Thomas; Hayashi, Koichi; Lunedei, Enrico; Martin, Antony; Mercerat, Diego; Ohrnberger, Matthias; Poggi, Valerio; Renalier, F.; Sicilia, D.; Socco, Laura

doi:10.1007/s10518-017-0206-7

Cited by 402 publications

(249 citation statements)

References 20 publications

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“…The survey conducted for nine sites in the Pyrenees used 5-s velocimeters (Lennartz LE-3D) connected to a wireless array analysis system (Ohrnberger (Foti et al 2017). Indeed, we usually used 15 sensors, which allowed double-circle geometry (one in the center; 29 seven equally spaced around two circles).…”

Section: Acquisition Layoutmentioning

confidence: 99%

“…The overall processing procedure from the 'raw data' to the velocity profiles and the other outcomes was consistent with the current state-of-the-art practices. A description of this procedure can be found in the recommendations of the InterPacific project guidelines (Foti et al 2017), which focus on fundamental Rayleigh-wave processing and inversion. In the present study, when possible, we also use multi-mode inversion, and Rayleigh-wave and Love-wave joint inversion.…”

Section: Acquisition Layoutmentioning

confidence: 99%

“…Alternatively, methods based on analysis of Rayleigh-wave and/or Love-wave surface-wave dispersion characteristics can allow the derivation of shear-wave velocity profiles. Even if the capabilities of these methods have been debated for a long time, they provide good estimates when implemented with care, as demonstrated within the InterPacific project (Garofalo et al 2016a, b;Foti et al 2017). In particular, Garofalo et al (2016b) outlined that V S30 can be equally well estimated using 'noninvasive' approaches (e.g., surface-wave-based methods) and 'invasive' approaches (e.g., cross-holes, down-holes).…”

Section: Introductionmentioning

confidence: 99%

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Characterization of site conditions (soil class, VS30, velocity profiles) for 33 stations from the French permanent accelerometric network (RAP) using surface-wave methods

Hollender

Cornou

Dechamp

et al. 2017

Bull Earthquake Eng

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Data provided by accelerometric networks are important for seismic hazard assessment. The correct use of accelerometric signals is conditioned by the station site metadata quality (i.e., soil class, V S30 , velocity profiles, and other relevant information that can help to quantify site effects). In France, the permanent accelerometric network consists of about 150 stations. Thirty-three of these stations in the southern half of France have been characterized, using surface-wave-based methods that allow derivation of velocity profiles from dispersion curves of surface waves. The computation of dispersion curves and their subsequent inversion in terms of shear-wave velocity profiles has allowed estimation of V S30 values and designation of soil classes, which include the corresponding uncertainties. From a methodological point of view, this survey leads to the following recommendations: (1)

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Section: Acquisition Layoutmentioning

confidence: 99%

Section: Acquisition Layoutmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of site conditions (soil class, VS30, velocity profiles) for 33 stations from the French permanent accelerometric network (RAP) using surface-wave methods

Hollender

Cornou

Dechamp

et al. 2017

Bull Earthquake Eng

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“…Modos superiores são particularmente excitados quando há grande contraste de impedância acústica entre camadas geológicas ou na presença de uma camada de baixa velocidade entre camadas de alta (FOTI et al, 2017). Modos superiores trazem informações adicionais importantes aos dados, especialmente por corresponderem a maiores profundidades de propagação da onda (STEIN e WYSESSION, 2003) (Figura 11).…”

Section: Dissertação De Mestrado -Claus Naves Eikmeier (2018) -Iag-uspunclassified

“…A curva preta indica o limite inferior de comprimento de onda para o qual não ocorre falseamento espacial (FOTI et al, 2017 Figura 31 -Exemplos de geometrias para arranjos 2D com espaçamento crescente entre geofones (adaptado de (FOTI et al, 2017) Figura 38 -Exemplo de resultado obtido no processo de inversão pelo software Dinver.…”

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Análise Multicanal de Ondas de Superfície (MASW): um estudo comparativo com fontes ativas e passivas, ondas Rayleigh e Love e diferentes modos de propagação

Eikmeier¹

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Dedico este trabalho aos meus pais, Jürgen Eikmeier e Letícia Naves CorrêaEikmeier, pelo amor e dedicação a minha educação e formação, e a minha esposa Olívia Portella André Cardoso, pelo amor, apoio, companheirismo e compreensão ao longo do tempo... AGRADECIMENTOS Agradeço primeiramente aos meus pais, Jürgen Eikmeier e Letícia Naves CorrêaEikmeier, pelo amor e educação que recebi ao longo da vida fazendo de mim a pessoa que sou hoje. Qualquer conquista alcançada será sempre por causa de vocês.A minha esposa Olívia Portella André Cardoso pelo amor, carinho, paciência, companheirismo e compreensão de tantas horas afastado para que fosse possível a realização desta etapa.Aos meus familiares e amigos que me deram condições e suporte em momentos adversos.Agradeço ao meu orientador Prof. Dr. Renato Luiz Prado pela amizade, ensinamentos e paciência ao longo da trajetória acadêmica e deste trabalho. the results. The rammer compactor showed to be a better active source in relation to sledgehammer through different aspects: generation of greater energy in vertical and transverse components; better quality of ( , ) spectrum; the data have the advantage that they can be processed using the f-k beamforming technique. The acquisition with ambient noise did not allow the dispersion curves interpretation due to the short acquisition time used. Passive Roadside MASW data contributed to the active data through the lower frequency. Besides that, due to the clear identification of the 1st higher mode in its ( , ) spectrum it was possible to identify the same mode in the ( , ) spectrum of the active data, interpretation that was, until then, doubtful. However, the joint inversion of the Passive Roadside dispersion curves with the active curves did not produce better results compared to the inversion obtained only by the active curves. The joint inversion of dispersion curves from radial (Rayleigh) and transversal (Love waves) components with the curves obtained by the vertical component (Rayleigh waves) also did not bring a better result when compared with the inversion achieved only by the vertical component curves.The use of the first higher mode with the fundamental mode, however, showed significant improvements in the joint inversions results compared to inversions only of the fundamental mode curve. Considering the uncertainties involved, the best results of this work converge with the a priori information of the study area. At the current MASW method stage of development, several steps are quite dependent on the operator. Therefore, the studies carried out in this work contribute to a better understanding of the method in its fundamentals, acquisition parameters and processing.

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Forward modeling of Rayleigh surface waves for analytical characterization of dominant dispersion trends

Lin

Ashlock

et al. 2021

Earthq Engng Struct Dyn

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Forward modeling is of critical importance for inversion analysis of surface wave methods to obtain shear‐wave velocity (VS) profiles of soil sites. The dynamic stiffness matrix (DSM) method can provide forward modeling of Rayleigh surface waves to simulate complex wave propagation in layered soil sites. However, contamination from body waves and interference of multiple Rayleigh wave modes can reduce the accuracy of theoretical dispersion curves, especially at irregular soil sites with embedded low‐velocity or high‐velocity layers. An analytical method is developed herein to combine the techniques of the multichannel analysis of surface waves method with the DSM method to improve the accuracy of the theoretical dispersion analysis for soil sites. The proposed method implements multichannel analysis of the analytical displacement responses to capture dominant dispersion trends. Comparison of the results obtained with the new method against those from the transfer matrix method and the literature indicates that the new method can (1) effectively minimize the effects of contamination caused by body waves and interference from several Rayleigh wave modes, and (2) generate accurate dominant dispersion trends for soil sites with various stiffness profiles, especially for the high‐frequency dispersion characteristics of the profiles with embedded low‐velocity layers.

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Guidelines for the good practice of surface wave analysis: a product of the InterPACIFIC project

Cited by 402 publications

References 20 publications

Characterization of site conditions (soil class, VS30, velocity profiles) for 33 stations from the French permanent accelerometric network (RAP) using surface-wave methods

Characterization of site conditions (soil class, VS30, velocity profiles) for 33 stations from the French permanent accelerometric network (RAP) using surface-wave methods

Análise Multicanal de Ondas de Superfície (MASW): um estudo comparativo com fontes ativas e passivas, ondas Rayleigh e Love e diferentes modos de propagação

Forward modeling of Rayleigh surface waves for analytical characterization of dominant dispersion trends

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