Experimental Relationship Between Ambient Vibration H/V Peak Amplitude and Shear-wave Velocity Contrast

Oubaiche, El Hadi; Chatelain, Jean‐Luc; Bouguern, Abderrahmane; Bensalem, Rabah; Machane, Djamel; Hellel, Mustapha; Khaldaoui, F.; Guillier, Bertrand

doi:10.1785/0220120004

Cited by 27 publications

(8 citation statements)

References 21 publications

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“…The H/V frequency peak is obtained by calculating the ratio between the amplitude spectra of the averaged horizontal and the vertical components of the ambient vibration recordings (e.g., [25]). Although this method has proven its reliability in estimating the fundamental resonance frequency of the soil, it appears to under-estimate the amplification factor (e.g., [27,28]). This issue is mainly related to the relative contribution of the different types of seismic waves (e.g., [29]).…”

Section: The Horizontal To Vertical Spectral Ratio (Hvsr) Techniquementioning

confidence: 99%

“…The RayDec method, based on the random decrement technique [33], uses the vertical component as a trigger and stacks a large number of horizontal and vertical signals in order to emphasize the Rayleigh waves with respect to the body and Love waves. Although this method has proven its reliability in estimating the fundamental resonance frequency of the soil, it appears to under-estimate the amplification factor (e.g., [27,28]). This issue is mainly related to the relative contribution of the different types of seismic waves (e.g., [29]).…”

Section: Rayleigh Wave Ellipticity Curve Extraction and Inversionmentioning

confidence: 99%

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A Shear-Wave Velocity Model in the City of Oued-Fodda (Northern Algeria) from Rayleigh Wave Ellipticity Inversion

et al. 2020

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The city of Oued-Fodda is located in north-central Algeria on the margins of the Middle-Cheliff Basin. This region has suffered several destructive earthquakes. The strongest was the 1980 El-Asnam earthquake (Ms7.3), whose causative fault was located about 1 km north of the city of Oued-Fodda. Therefore, a good knowledge of the soil characteristics in this city may allow a better evaluation of the seismic risk and help to minimize damages in the future. With this objective, a detailed microzonation study of Oued-Fodda has been carried out in this study. For that, the horizontal-to-vertical spectral ratio (HVSR) method has been applied on 102 sites along the city, estimating the soil fundamental frequencies and their corresponding amplitudes. Besides, the Rayleigh wave ellipticity inversion has been accomplished in order to estimate the corresponding Vs profiles and provide two cross-sections of the geology under the city. In the central part of the city, high-frequency peaks are observed, between 12.5 and 15 Hz, which correspond to impedance contrasts at shallow depth (<20 m). In the surrounding plain, two clear peaks are identified in the ranges 1.8-3.5 Hz (fundamental frequencies) and 6.5-15 Hz (secondary peaks).

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Section: The Horizontal To Vertical Spectral Ratio (Hvsr) Techniquementioning

confidence: 99%

Section: Rayleigh Wave Ellipticity Curve Extraction and Inversionmentioning

confidence: 99%

A Shear-Wave Velocity Model in the City of Oued-Fodda (Northern Algeria) from Rayleigh Wave Ellipticity Inversion

et al. 2020

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“…CityShark II has been successfully used in various types of ambient vibration studies: buildings (Figure 9 and [6][7][8][9][10][11]), arrays (Figure 10 and [12][13][14][15]), landslides [15] and single-station (H/V) (Figure 3 and [16][17][18][19][20][21][22]).…”

Section: Resultsmentioning

confidence: 99%

Ambient Vibration Recording for Single-Station, Array and Building Studies Made Simple: CityShark II

Chatelain¹,

Guillier²,

Guéguen³

et al. 2012

IJG

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This article describes an improved data acquisition system from a previous system dedicated to one-sensor site studies, aimed at recording ambient vibrations (microtremors). A multi-channel and/or remote triggering system is proposed. The system was conceived by IRD-Leas, France, and used at ISTerre, France, for research activities. The size, weight of this high quality system and its autonomy (no need to be connected to a laptop) make it a real portable device. The system acquires data with 24-bit delta-sigma ADCs in the 10 - 1000 sps range at 10 - 20 bit resolution on up to 18 channels in the multi-channel version. The input stage dynamics is available at ±2.5 V or ±5 V. The dynamic range varies, for example, from 108 dB at 100 sps to 90 dB at 250 sps. Gain is selectable from 1 (0 dB) to 8192 (78 dB) by powers of two (6 dB). Its very low level of internal noise allows recording of very low tension signals without missing code. Continuous recording and GPS may also be implemented in the system. While primarily dedicated to ambient vibration recordings, this system can be connected to any type of device delivering an output tension in the ±5 V range

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“…(2019) found that the seismic ampli cation up to 20 had been caused by the impedance contrast between the rock layer with the resistivity of 3500 Ohm.m and the one with the resistivity of 2500 Ohm.m. As HVSR curve amplitude is directly proportional to impedance contrast of seismic wave (Oubaiche et al 2012;Uebayashi et al;Hartzell et al 2017), the HVSR curve amplitude can re ect the magnitude of the impedance contrast. However, the seismic response ampli cation coe cient in the unstable part of the slope monitored by us is only 2.64-3.51, smaller than the ampli cation coe cient monitored by Danneels (2008) and Ma et al (2019).…”

Section: Discussionmentioning

confidence: 99%

Seismic Site Response of A Large Deep-seated Rock Slope Revealed by Field Monitoring and Geophysical Methods

Wang¹,

Cui²,

Pei³

et al. 2021

Preprint

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Shidaguan Slope (hereinafter short for SDG Slope) is an unstable rock slope with an area of 30.78×104 m2 and a deformation depth of 30-70 m in Maoxian County, Sichuan Province, China. Three seismometers (P2-P4) with high sensitivity were installed at different locations on the unstable part of the slope. P2 and P3 were almost at the same elevation (2221 m and 2247 m), while P4 was the lowest (at 2140 m). Another seismometer (P1) sat in a stable location at a higher elevation (2373 m). 99 shallow earthquakes were analyzed. According to the peak acceleration ratios of three seismometers (P2-P4) on the unstable part and another seismometer (P1) on the stable part, the points at lower elevations showed greater seismic amplification (with the amplification coefficient of 2.64-3.51) than one at a higher elevation. And points at relatively thinner part (23 m thick) of unstable slope showed greater seismic amplification than ones at thick part (60-75 m thick). The same rule was also found in studying the site-epicenter azimuth and earthquake magnitude data. Based on the relationship between amplification coefficient and resistivity and rock core, the seismic response amplification was affected by the lithofacies difference. The lithofacies with resistivity values of 50-100 Ohm.m and RQD values of 0-50 % incurred seismic response amplification, which was restrained by the below lithofacies with resistivity values of 10-50 Ohm.m and ROD values of 0 %. When building on slope areas, the lithofacies difference should be taken into full consideration.

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Experimental Relationship Between Ambient Vibration H/V Peak Amplitude and Shear-wave Velocity Contrast

Cited by 27 publications

References 21 publications

A Shear-Wave Velocity Model in the City of Oued-Fodda (Northern Algeria) from Rayleigh Wave Ellipticity Inversion

A Shear-Wave Velocity Model in the City of Oued-Fodda (Northern Algeria) from Rayleigh Wave Ellipticity Inversion

Ambient Vibration Recording for Single-Station, Array and Building Studies Made Simple: CityShark II

Seismic Site Response of A Large Deep-seated Rock Slope Revealed by Field Monitoring and Geophysical Methods

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