Single station determination of Rayleigh wave ellipticity by using the random decrement technique (RayDec)

Hobiger, Manuel; Bard, Pierre‐Yves; Cornou, Cécile; Bihan, Nicolas Le

doi:10.1029/2009gl038863

Cited by 100 publications

(64 citation statements)

References 13 publications

(12 reference statements)

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“…Some recent advances in the field (e.g., the RayDec method by Hobiger et al (2009) and the FTAN method by ) aim at extracting the pure Rayleigh wave portion of the wavefield from single-station analysis. Only these Rayleigh wave portions are then used for H/V calculations.…”

Section: Methods Of Analysismentioning

confidence: 99%

“…Synthetic noise datasets were obtained using the mode summation algorithm of Herrmann (2001) and about 12,500 randomly distributed point sources (single force vectors) of random amplitudes as a background noise environment. The sources are distributed only outside of the array, simulating ideal conditions, in distances between 90 m and 2.2 km from the array centre (black in Fig.…”

Section: Synthetic Datamentioning

confidence: 99%

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Love wave contribution to the ambient vibration H/V amplitude peak observed with array measurements

Endrun

2010

J Seismol

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To cite this version:Brigitte Endrun. Love wave contribution to the ambient vibration H/V amplitude peak observed with array measurements. Journal of Seismology, Springer Verlag, 2010, 15 (3) Abstract: This study applies array methods to measure the relative proportions of Love and Rayleigh waves in the ambient vibration wavefield. Information on these properties is of special relevance for frequencies around the horizontal-to-vertical (H/V) spectral amplitude ratio peak. The analysis of H/V curves, a popular technique in site characterisation, commonly assumes that the curves represent the frequency-dependent Rayleigh wave ellipticity. For the detailed interpretation of amplitudes or the inversion of the curves, it is therefore necessary to estimate and correct for the contribution of other wave types to the ambient vibration wavefield. I use available ambient vibration array measurements to determine the relative amount of Love and Rayleigh waves on the horizontal components by frequency-dependent analysis of the main propagation and polarisation directions, with a special emphasis on the H/V peak frequency as determined from the same recordings. Tests with synthetic data demonstrate the feasibility of this approach, at least in the presence of dominant source regions. Analysis of the data from 12 measurements at nine European sites, which include shallow as well as deep locations that span a wide range of impedance contrasts at the sediment-bedrock interface, indicates that the relative contribution of Rayleigh waves varies widely with frequency, from close to 0\% to more than 70\%. While most data sets show relative Rayleigh wave contributions between 40\% and 50\% around the H/V peak, there are also examples where Love waves clearly dominate the wavefield at the H/V peak, even for a site with a low impedance contrast. Longer-term measurements at one site indicate temporal variations in the relative Rayleigh wave content between day-and nighttime. Results calculated with the method introduced herein generally compare well with results of modified spatial autocorrelation analysis. These two methods might be used in a complimentary fashion, as both rely on different properties of the ambient vibration wavefield. This study illustrates that it is possible to measure the relative Rayleigh wave content of the noise wavefield from array data. Furthermore, the examples presented herein indicate it is important to estimate this property, as the assumption that there are an equal proportion of Love and Rayleigh waves is not always correct.Response to Reviewers: Please refer to the uploaded PDF file ResponsetoReviewersJOSE405.pdf Abstract This study applies array methods to measure the relative proportions of Love and Rayleigh waves in the ambient vibration wavefield. Information on these properties is of special relevance for frequencies around the horizontalto-vertical (H/V) spectral amplitude ratio peak. The analysis of H/V curves, a popular technique in site characterisation, commonly assumes that the curves repre...

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Section: Methods Of Analysismentioning

confidence: 99%

Section: Synthetic Datamentioning

confidence: 99%

Love wave contribution to the ambient vibration H/V amplitude peak observed with array measurements

Endrun

2010

J Seismol

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“…Surface waves that are generated by natural sources and (or) man-made activities have lower frequencies (longer wavelengths) than waves generated by impact loads. Multiple techniques have been applied for analysis of ambient noise (passive-source) vibrations acquired by a linear receiver array (e.g., Louie 2001;Park and Miller 2008), a two-dimensional array (e.g., Asten 2006;Di Giulio et al 2006;Garofalo et al 2016;Wathelet et al 2008) or a single station (e.g., Gouveia et al 2016;Hobiger et al 2009Hobiger et al , 2013. By combining results of active-source and passive-source surveys, an increased range in investigation depth can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Tool for analysis of multichannel analysis of surface waves (MASW) field data and evaluation of shear wave velocity profiles of soils

2018

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Multichannel analysis of surface waves (MASW) is a fast, low-cost, and environmentally friendly technique to estimate shear wave velocity profiles of soil sites. This paper introduces a new open-source software, MASWaves, for processing and analysing multichannel surface wave records using the MASW method. The software consists of two main parts: a dispersion analysis tool (MASWaves Dispersion) and an inversion analysis tool (MASWaves Inversion). The performance of the dispersion analysis tool is validated by comparison with results obtained by the Geopsy software package. Verification of the inversion analysis tool is carried out by comparison with results obtained by the software WinSASW and theoretical dispersion curves presented in the literature. Results of MASW field tests conducted at three sites in south Iceland are presented to demonstrate the performance and robustness of the new software. The soils at the three test sites ranged from loose sand to cemented silty sand. In addition, at one site, the results of existing spectral analysis of surface waves (SASW) measurements were compared with the results obtained by MASWaves.

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“…It is important to point out that the RPM curves quantify the retrograde or prograde motion and not the Rayleigh-wave ellipticity as described for instance in Hobiger et al (2009) for passive data and Dal Moro et al (2015aMoro et al ( , b, 2016 for active data. The RPM data describe the verse (retrograde, prograde, or Vol.…”

Section: Introductionmentioning

confidence: 99%

Improved Holistic Analysis of Rayleigh Waves for Single- and Multi-Offset Data: Joint Inversion of Rayleigh-Wave Particle Motion and Vertical- and Radial-Component Velocity Spectra

Moro

Moustafa

Al-Arifi

2017

Pure Appl. Geophys.

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Abstract-Rayleigh waves often propagate according to complex mode excitation so that the proper identification and separation of specific modes can be quite difficult or, in some cases, just impossible. Furthermore, the analysis of a single component (i.e., an inversion procedure based on just one objective function) necessarily prevents solving the problems related to the non-uniqueness of the solution. To overcome these issues and define a holistic analysis of Rayleigh waves, we implemented a procedure to acquire data that are useful to define and efficiently invert the three objective functions defined from the three following ''objects'': the velocity spectra of the vertical-and radialcomponents and the Rayleigh-wave particle motion (RPM) frequency-offset data. Two possible implementations are presented. In the first case we consider classical multi-offset (and multi-component) data, while in a second possible approach we exploit the data recorded by a single three-component geophone at a fixed offset from the source. Given the simple field procedures, the method could be particularly useful for the unambiguous geotechnical exploration of large areas, where more complex acquisition procedures, based on the joint acquisition of Rayleigh and Love waves, would not be economically viable. After illustrating the different kinds of data acquisition and the data processing, the results of the proposed methodology are illustrated in a case study. Finally, a series of theoretical and practical aspects are discussed to clarify some issues involved in the overall procedure (data acquisition and processing).

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Single station determination of Rayleigh wave ellipticity by using the random decrement technique (RayDec)

Cited by 100 publications

References 13 publications

Love wave contribution to the ambient vibration H/V amplitude peak observed with array measurements

Love wave contribution to the ambient vibration H/V amplitude peak observed with array measurements

Tool for analysis of multichannel analysis of surface waves (MASW) field data and evaluation of shear wave velocity profiles of soils

Improved Holistic Analysis of Rayleigh Waves for Single- and Multi-Offset Data: Joint Inversion of Rayleigh-Wave Particle Motion and Vertical- and Radial-Component Velocity Spectra

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