Non-Stability and Non-Reproducibility of Ambient Vibration HVSR Peaks in Algiers (Algeria)

Benkaci, Nassima; Oubaiche, El Hadi; Chatelain, Jean‐Luc; Bensalem, Rabah; Benouar, Djillali; Abbes, Khadidja

doi:10.1080/13632469.2018.1537903

Cited by 7 publications

(5 citation statements)

References 45 publications

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“…Although HVSR peaks are usually considered stable, recent studies have shown temporal variations in both the amplitude and frequency of the peaks. Some studies attribute these variations to changes in the source of ambient seismic noise over time [32,34], while others find explanations in variations in subsurface properties [41,42]. The latter phenomenon may hold the greatest potential in the field of applied environmental seismology, as it opens up new possibilities for diverse monitoring applications.…”

Section: Discussionmentioning

confidence: 99%

“…The ambient vibrations wavefield is composed of a time-dependent percentage of body waves and surface waves that travel within the upper layers of the Earth's crust and changes in the percentages of each wave component [29,30]. A possible explanation for the HVSR shape amplitude variation can be ascribed to the ambient vibration wavefield composition, which is variable in time [31][32][33][34][35]. The change in seismic wave velocity affects the propagation of seismic waves [36,37] with consequences for the HVSR shape [31,35].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Seismic Monitoring Tool for Tidal-Forced Aquifer Level Changes in the Río de la Plata Coastal Plain, Argentina

Galone,

Panzera,

Colica

et al. 2024

Sustainability

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Ambient seismic noise has gained extensive applications in seismology and plays a pivotal role in environmental seismic studies. This study focuses on the Río de la Plata Coastal Plain, employing the horizontal-to-vertical spectral ratio (HVSR) method on ambient seismic noise records to analyze subsurface dynamics. The region’s hydrogeology is complex, featuring partially interconnected coastal aquifers. The HVSR analysis reveals two peaks, with P0 associated with the sediment-basement interface and P1 linked to a shallower stratigraphic discontinuity. Temporal analysis of P1 highlights cyclical patterns correlated with estuarine levels, suggesting a relationship between variations in seismic velocities and tidal dynamics. Comparisons with aquifer data support the hypothesis that tidal variations influence subsurface mechanical properties, impacting the HVSR function. The study hints at the potential of ambient seismic noise analysis as a non-invasive and cost-effective method for studying coastal aquifers and understanding groundwater dynamics. Ongoing research aims to further explore these relationships for enhanced groundwater resource management.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Seismic Monitoring Tool for Tidal-Forced Aquifer Level Changes in the Río de la Plata Coastal Plain, Argentina

Galone,

Panzera,

Colica

et al. 2024

Sustainability

View full text Add to dashboard Cite

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“…The relatively low amplitude of the body waves is not sufficient to correctly estimate the amplification factor. Moreover, La Rocca et al [31] and Benkaci et al [32] have proven that the HVSR peak amplitude varies considerably with time. The amplitude of the frequency peak obtained from the HVSR technique in this study is interpreted as a relative indicator and not as a true amplification factor value.…”

Section: Horizontal-to-vertical Spectral Ratio Technique (Hvsr)mentioning

confidence: 98%

Liquefaction Potential and Vs30 Structure in the Middle-Chelif Basin, Northwestern Algeria, by Ambient Vibration Data Inversion

et al. 2022

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The Middle-Chelif basin, in northwestern Algeria, is located in a seismically active region. In its western part lies the El-Asnam fault, a thrust fault responsible for several strong earthquakes. The most important being the El-Asnam earthquake (Ms = 7.3) of 1980. In the present study, ambient vibration data with single-station and array techniques were used to investigate the dynamic properties of the ground and to estimate the Vs30 structure in the main cities of the basin. Soil resonance frequencies vary from 1.2 to 8.3 Hz with a maximum amplitude of 8.7 in. Collapsing behavior has also been demonstrated west of the city of El-Attaf, reflecting a strong potential for liquefaction. A Vs30 variation map and a soil classification for each city were obtained mainly by inversion of the HVSR and Rayleigh wave dispersion curves. Finally, an empirical prediction law of Vs30 for the Middle-Chelif basin was proposed.

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“…The whole building was instrumented with several series of measurements because of the different blocks and the number of sensors (four Lennartz velocimeters three-component with the Cityshark II station, see supplementary material in Figure 1S and Figure 2S) (Benkaci, N. and al., 2021;Chatelain, J.L. and al., 2012;Kibboua, A., 2006;Kibboua, A. and al., 2008), cables are needed to complete the circuit with the recording station and a laptop for signal processing.…”

Section: -2 Conduct and Processing Of Ambient Vibration Measurements ...mentioning

confidence: 99%

“…In order to resolve the non-stationary and random nature of the ambient vibrations, several modal exploration methods have been developed and integrated into data processing computer programs. The analyses of each data set were operated and performed with the Geopsy software (Benkaci, N. and al., 2021;Chatelain, J.L. and al., 2012) has integrated modules for calculating amplitude spectra using the fast Fourier transform.…”

Section: -2 Conduct and Processing Of Ambient Vibration Measurements ...mentioning

confidence: 99%

Predictive response to the behaviour of old structures using ambient vibrations

Maraf,

Naili,

Bensoula

et al. 2024

J. Eng. Exact Sci.

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The response of ancient structures such as the Saint-Jean-Baptiste church or the current El-Badr mosque in Mostaganem (Algeria) to earthquakes depends on these physical characteristics and consequently on modal properties such as frequencies, damping and modal deformations. In this paper, ambient vibration tests were carried out on the three parts of the mosque building, and the response spectra and damping obtained will be correlated with the mechanical tests carried out in the second part of the work. Determination of the dynamic characteristics made it possible to distinguish differences in stiffness and to clearly highlight a disparity in frequencies in each structure, which may correspond to the age of each part of the building, the design and construction and differences in levels, etc. The results of the destructive tests give indications that confirm the hypotheses of ageing of the materials. The low young modulus of the various components partly confirms the frequency and damping values obtained. The experimental study of the mosque using ambient vibrations will give an order of magnitude of the vibratory mode periods, which are the first steps in any modelling, reinforcement and/or verification strategy and constitute a health record for this type of heritage.

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Non-Stability and Non-Reproducibility of Ambient Vibration HVSR Peaks in Algiers (Algeria)

Cited by 7 publications

References 45 publications

A Seismic Monitoring Tool for Tidal-Forced Aquifer Level Changes in the Río de la Plata Coastal Plain, Argentina

A Seismic Monitoring Tool for Tidal-Forced Aquifer Level Changes in the Río de la Plata Coastal Plain, Argentina

Liquefaction Potential and Vs30 Structure in the Middle-Chelif Basin, Northwestern Algeria, by Ambient Vibration Data Inversion

Predictive response to the behaviour of old structures using ambient vibrations

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