3D near-surface soil response from H/V ambient-noise ratios

Woolery, Edward W.; Street, R.

doi:10.1016/s0267-7261(02)00109-4

Cited by 36 publications

(22 citation statements)

References 18 publications

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“…This numerical experiment, close to field measurements (noise sources located at various distances), agrees with field experiments showing that observed H/V ratios exhibit, usually, only one peak. Note that this statement is true in a majority of cases, but multiple peaks on H/V curves have been sometimes reported (Guéguen et al 1998;Bodin et al 2001;Lebrun et al 2001;Woolery & Street 2002;Asten 2004;Oliveto et al 2004). For example, Bodin et al (2001) have observed and documented two higher peaks in a large set of H/V data in the Mississippi basin.…”

Section: Discussionmentioning

confidence: 94%

H/V ratio: a tool for site effects evaluation. Results from 1-D noise simulations

Bonnefoy-Claudet

Cornou

Bard

et al. 2006

Geophysical Journal International

419

201

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National audienceAmbient vibration techniques such as the H/V method may have the potential to significantly contribute to site effect evaluation, particularly in urban areas. Previous studies interpret the so-called Nakamura's technique in relation to the ellipticity ratio of Rayleigh waves, which, for a high enough impedance contrast, exhibits a pronounced peak close to the fundamental S-wave resonance frequency. Within the European SESAME project (Site EffectS assessment using AMbient Excitations) this interpretation has been tested through noise numerical simulation under well-controlled conditions in terms of source type and distribution and propagation structure. We will present simulations for a simple realistic site (one sedimentary layer over bedrock) characterized by a rather high impedance contrast and low quality factor. Careful H/V and array analysis on these noise synthetics allow an in-depth investigation of the link between H/V ratio peaks and the noise wavefield composition for the soil model considered here: (1) when sources are near (4 to 50 times the layer thickness) and surficial, H/V curves exhibit one single peak, while the array analysis shows that the wavefield is dominated by Rayleigh waves; (2) when sources are distant (more than 50 times the layer thickness) and located inside the sedimentary layer, two peaks show up on the H/V curve, while the array analysis indicates both Rayleigh waves and strong S head waves; the first peak is due to both fundamental Rayleigh waves and resonance of head S waves, the second is only due to the resonance of head S waves; (3) when sources are deep (located inside the bedrock), whatever their distance, H/V ratio exhibit peaks at the fundamental and harmonic resonance frequencies, while array analyses indicate only non-dispersive body waves; the H/V is thus simply due to multiple reflections of S waves within the layer. Therefore, considering that experimental H/V ratio (i.e. derived from actual noise measured in the field) exhibit in most cases only one peak, we conclude that H/V ratio is (1) mainly controlled by local surface sources, (2) mainly due to the ellipticity of the fundamental Rayleigh waves. Then the amplitude of H/V peak is not able to give a good estimate of site amplification facto

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Section: Discussionmentioning

confidence: 94%

H/V ratio: a tool for site effects evaluation. Results from 1-D noise simulations

Bonnefoy-Claudet

Cornou

Bard

et al. 2006

Geophysical Journal International

419

201

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Section: Horizontal-to-vertical Spectral Ratio Analysismentioning

confidence: 99%

“…For example, several studies have derived shear-wave velocity profiles from ambient-noise/microtremor HVSR analyses [26,27]. However, it has also been found that results from the ambientnoise/microtremor HVSR method are not unique [26,28,29]. As Bonnefoy-Claudet and others [29] pointed out, ambient noise sources are (1) controlled by local surface sources and (2) caused by the ellipticity of the fundamental Rayleigh waves.…”

Section: Horizontal-to-vertical Spectral Ratio Analysismentioning

confidence: 99%

Nonlinear site response from the strong ground-motion recordings in western China

Rong

Wang

Woolery

et al. 2016

Soil Dynamics and Earthquake Engineering

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“…Woolery and Street 2002). Several techniques that use microtremors have been applied, taking into account a variety of parameters such as depth to bedrock, Vs profile and underground heterogeneity (e.g.…”

Section: Inversion Of Hvsr Curvesmentioning

confidence: 99%

Seismic damage scenarios in Lefkas old town (W. Greece)

Kassaras

Kalantoni

Benetatos

et al. 2015

Bull Earthquake Eng

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Damage scenarios were developed for the Lefkada old town (LOT). LOT is the historical center of the capital of Lefkas Island, part of the Ionian Islands, one of the most seismically prone areas within the Mediterranean region that suffered numerous devastating earthquakes in the past. The most recent strong earthquake with Mw = 6.2 occurred on 14 August 2003 at a distance of about 13 km from LOT. A peak ground acceleration (PGA) equal to 0.42 g was recorded in LOT, one of the highest values ever recorded in Greece. Nevertheless, the 2003 event produced limited damage to the buildings of LOT, comprising traditional construction practices of architectural significance and a high seismic behaviour. Towards the development of damage scenarios the following tasks were performed: (a) buildings inventory and vulnerability indices determination using EMS-98 along with behaviour modification scores, (b) subsoil response functions and 1D viscoelastic models calculation using microtremors and (c) stochastic PGA simulation using site amplification deduced from the subsoil response functions. Two scenarios were developed considering the sources of the 2003 M6.2 earthquake and a future M7 event, located at the same fault. The discrete damage probability was resolved by formulating a beta distribution of an average damage grade related to the vulnerability index and the simulated PGA through empirical equations. The deduced models are comparable with the observed 2003 damage distribution, hence they are likely useful for preparing future emergency plans. In the aftermath, although further investigation is needed to explain outliers, the implementation of the followed methodology into an automated procedure for near real time shake and damage maps generation in case of a seismic crisis is highly recommended. The work herein, with proper adaptations, is potentially fairly applicable for other towns and regions in Europe.

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3D near-surface soil response from H/V ambient-noise ratios

Cited by 36 publications

References 18 publications

H/V ratio: a tool for site effects evaluation. Results from 1-D noise simulations

H/V ratio: a tool for site effects evaluation. Results from 1-D noise simulations

Nonlinear site response from the strong ground-motion recordings in western China

Seismic damage scenarios in Lefkas old town (W. Greece)

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