Shallow velocity structure using joint inversion of array and h/v spectral ratio of ambient noise: The case of Mula town (SE of Spain)

García‐Jerez, Antonio; Navarro, Manuel; Alcalá, Francisco; Luzón, Francisco; Pérez-Ruiz, J. Alfonso; Enomoto, Takahisa; Vidal, F.; Ocaña, Esteban Rodríguez

doi:10.1016/j.soildyn.2007.03.001

Cited by 50 publications

(30 citation statements)

References 25 publications

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“…Yawar Hussain; Hernan Martinez-Carvajal; Martin Cárdenas-Soto; Rogério Uagoda; Salvatore Martino & Muhammad B. Hussain This technique is based on an idea that frequencydependent ellipticity of surface wave motion can be explained by the shape of HVSR curve (Benjumea et al, 2016) and for determining the resonance of soil deposit over basement was given by Nogoshi & Igarashi (1970, 1971. This technique has been revised after the work of Nakamura, (2008) and now it is considered as a suitable technique for earthquake hazards assessments through microzoation (Di Giulio et al, 2014), to bedrock depth estimation (García-Jerez et al, 2007;Gosar & Lenart, 2010;Ullah et al, 2016) as well as its utilization in archeology is also well established (Kalil et al, 2016) and landslide studies, slip surface and volume estimations are other accepts of its applications (Del Gaudio et al, 2008;Pazzi et al, 2016;Imposa et al, 2017).…”

Section: Hvsrmentioning

confidence: 99%

Resposta em Microtremor de um Movemento de Massa no Distrito Federal, Brasil

et al. 2017

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The present study provides a brief description of the ambient noise recorded at a slow moving mass movement in Ribeirão Contagem Basin. The area is an interesting natural laboratory as river detachment processes in a number of different stages can be identified and are easily accessible. We investigate the site dynamic characteristics of the study area by recording ambient noise time-series at nine points, using portable nine three-component short period seismometers. The time-series are processed to give both horizontal to vertical spectral ratio (HVSR) curves as well as time-frequency plots of noise power spectral density (SPD). The HVSR curves illustrate and quantify aspects of site resonance effects due to the local geological setting. Probability density function (PDF) shows that noise level lies well between new high noise model (NHNM) and new lower noise model (NLNM) and their probabilities are higher above 2 Hz. HVSR curves present a uniform lithologically controlled peak at 2 Hz. Directional properties of the wavefield are determined by beamforming method. The f-k analysis results in the E-W component show that at 5 Hz phase velocities are close to 1700 m/s while at 10 Hz dropped to 250 m/s. We observed that between 5 and 16 Hz the incoming wavefield arrive from 260 degrees. Further studies will apply a detailed noise analysis for relating the dynamics of the landslide (which can be retriggered by river erosion as well as rainfalls and seismic shaking) to possible changes in detectable physical properties. Keywords: Seismic noise; Power Spectral Density; Probability Density Function; HVSR; f-k analysis ResumoO estudo apresentado fornece uma ampla descrição do ruído ambiental registrado de um deslizamento de encosta lento localizado na bacia do Ribeirão Contagem no Distrito Federal. A área de estudo é um laboratório natural na medida que os processos erosivos do rio podem ser analisados em diferentes estágios de evolução dentro de um setor de fácil acesso. A pesquisa abrange o estudo das características dinâmicas da área por meio do registro das séries temporais do ruído ambiental em nove pontos mediante o uso de sismómetros de período curto e três componentes. As series temporais são processadas para obter as curvas de relação espectral horizontal-vertical (HVSR) e também os gráficos tempo:frequência dos espectros de potência (SPD). As curvas HVSR ilustram e quantificam aspectos dos efeitos de ressonância local devidos ao ambiente geológico. A função de desnsidade de probabilidade (PDF) mostra que os níveis de ruído registrados estão enquadrados entre os limites conhecidos como NHNM (new high noise model) e NLNM (new lower noise model) e que suas probabilidades são maiores acima de 2 Hz. As curvas HVSR apresentam um pico de resposta uniforme litológicamente controlado a 2 Hz. As propriedades direcionais do campo de ondas são determinadas pelo método da viga (beamforming method). A análise dos resultados na componente EW indica que na fase de 5 Hz a velocidade está próxima de 1700 m/s enquanto qu...

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Section: Hvsrmentioning

confidence: 99%

Resposta em Microtremor de um Movemento de Massa no Distrito Federal, Brasil

et al. 2017

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“…This suggests that modeling DEDHVR low frequency might be meaningful even it is commonly accepted that usual H/V ratio measurements are only sensitive to the shallower layers (e.g., Bard, 1999;García-Jerez et al, 2007). In such case, the depth resolution of the DEDHVR method is controlled by both, the geological structure itself (i.e., with strong velocity contrasts at depth) and the instrument capabilities.…”

Section: Caldera Mechanical Propertiesmentioning

confidence: 99%

Velocity models and site effects at Kawah Ijen volcano and Ijen caldera (Indonesia) determined from ambient noise cross-correlations and directional energy density spectral ratios

Spica

Caudron

Perton

et al. 2015

Journal of Volcanology and Geothermal Research

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“…Several studies have since applied this kind of joint inversion (e.g. Arai and Tokimatsu, 2005;Nagashima and Maeda, 2005;Parolai et al, 2005;Garcia-Jerez et al, 2007;Picozzi and Albarello, 2007;Arai and Tokimatsu, 2008;D'Amico et al, 2008). Others use additional data, for example from borehole or array measurements, to fix either the sediment thickness (e.g.…”

Section: Introductionmentioning

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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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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Shallow velocity structure using joint inversion of array and h/v spectral ratio of ambient noise: The case of Mula town (SE of Spain)

Cited by 50 publications

References 25 publications

Resposta em Microtremor de um Movemento de Massa no Distrito Federal, Brasil

Resposta em Microtremor de um Movemento de Massa no Distrito Federal, Brasil

Velocity models and site effects at Kawah Ijen volcano and Ijen caldera (Indonesia) determined from ambient noise cross-correlations and directional energy density spectral ratios

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

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