Imagery of the metamorphic bedrock roof of the Sahel active fault in the Sablettes (Algiers) reclaimed area by ambient vibration HVSR

Tebbouche, Mohamed Yacine; Machane, Djamel; Chabane, Souhila; Oubaiche, El Hadi; Meziani, Aghiles Abdelghani; Benamar, Dalila Ait; Moulouel, Hakim; Lounis, Ghani Cheikh; Bensalem, Rabah; Bendaoud, Abderrahmane

doi:10.1007/s12517-017-3074-1

Cited by 6 publications

(4 citation statements)

References 66 publications

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“…The HVSRN technique commonly involves an inversion process to determine the V s structure of the study area (e.g., Arai and Tokimatsu 2004;Parolai et al 2006;Castellaro and Mulargia 2009a;Mundepi et al 2015;Borges et al 2016;Picotti et al 2017;Rosa-Cintas et al 2017). Other authors have used f 0 identified from the HVSRN technique to determine the V s structure, particularly for imaging the bedrock using a 1D empirical relationship that relies on the depth to bedrock, V s and the f 0 (e.g., Tebbouche et al 2017).…”

Section: Introductionmentioning

confidence: 99%

S‐wave velocity structure of Chlef City, Algeria, by inversion of Rayleigh wave ellipticity

Layadi

Semmane

Yelles‐Chaouche

2018

Near Surface Geophysics

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Chlef City, Algeria, which is located in the Lower Cheliff Basin, is vulnerable to seismic hazards. Since there is no constrained velocity model for the Lower Cheliff Basin, particularly at greater depths, we conducted an ambient vibration investigation to map the shear‐wave velocity structure beneath the city, with the primary goal of supplementing the existing microzonation studies. Here, we inverted the Rayleigh wave ellipticity measurement curve of ambient vibrations measurements from 120 sites in Chlef City to estimate the shear‐wave velocity structure. The study area was subdivided into six zones based on similarities between the observed horizontal‐to‐vertical spectral ratio of the ambient vibrations curves. Our resultant shear‐wave velocity models show that the observed fundamental frequencies (0.3–1.6 Hz) are related to a thick layer (~800 m) of upper Miocene deposits, where Vs=1000 m/s on average. Generally, the Mesozoic basement shows Vs>2000 m/s. Moreover, the clear peaks observed at higher frequencies and only in the northwest part of the city are related to a thin layer of Quaternary deposits (Vs= ∼2000 m/s).

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Section: Introductionmentioning

confidence: 99%

S‐wave velocity structure of Chlef City, Algeria, by inversion of Rayleigh wave ellipticity

Layadi

Semmane

Yelles‐Chaouche

2018

Near Surface Geophysics

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“…MB is for Mitidja Basin; DM is for Djurdjura Massif. Study N° 1 is by [7], 2 and 9 are by [8] and [13], 3 is by [10], 4 is by [11], 5 is by [12], 6 is an unpublished ANRH report, 7 is by [21], 8 is by [15].…”

Section: Study Of the Effects Of Sites Constructed In Algerian Urban ...mentioning

confidence: 99%

“…The engineering bedrock identified in the Chéliff region has a Vs of 1000 m/s ( [2]). Another analysis is mapped for the Algiers region by [8], where the explanation of the low frequency peaks was impossible by a bedrock Vs of 700 m/s, and the most adequate is that of a higher velocity, in the vicinity of 4000 m/s of Paleozoic metamorphosis outcrops in Bouzeréah Massif, Northern border of Mitidja Basin ( [9]) and Djurdjura Massif (Fig. 1).…”

Section: Study Of the Effects Of Sites Constructed In Algerian Urban ...mentioning

confidence: 99%

Synthesis on the Shear Wave Velocity of Engineering and Seismic Bedrocks in Northern Algeria based on Recent Experimental Investigations

2023

1st International Conference on Modern and Advanced Research Icmar 2023

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In the field of civil engineering, knowledge of good rocky ground resistant to collapse minimizes the level of seismic risk, often known as the "engineering bedrock". In lithology, it overlays a harder rock known as "seismic bedrock". The latter is a transition zone between the earth's crust and the surface layers. It is sometimes impossible to carry out deep drilling and investigation techniques to define the engineering substratum for the foundations; in this case we rely on the seismic regulations. In Algeria, after the 2003 Boumerdès earthquake, seismology studies were expanded in order to better understand the Algerian crust on both the marine and continental sides. Furthermore, studies on seismic risk reduction in urban environments are increasingly focusing on the phenomenon of site effects or local amplification. Several experimental studies conducted in Algeria as part of seismic microzoning programs have defined the existence of these two substrate interfaces by identifying the natural frequencies of the ground. In this work, we describe the findings of numerous key research that reached the seismic bedrock in Algeria. It is classified as having two geological natures: Mesozoic with a shear wave velocity, Vs, less than 3000 m/s, and metamorphosed Paleozoic with Vs greater than 3500 m/s.

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“…The main objectives were to estimate the soil resonance frequencies, the shear-wave velocities in the sedimentary rocks, and the depths to seismic bedrock, where the relatively high impedance contrast with Miocene formations may amplify ground shaking during an earthquake. In the Mitidja basin, Bouchelouh [23] and Tebbouche [24] estimated and mapped the roof of the engineering bedrock using mainly ambient vibration data.…”

Section: Introductionmentioning

confidence: 99%

Shallow S-Wave Velocity Structure in the Middle-Chelif Basin, Algeria, Using Ambient Vibration Single-Station and Array Measurements

et al. 2021

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In order to better assess the seismic hazard in the northern region of Algeria, the shear-wave velocity structure in the Middle-Chelif Basin is estimated using ambient vibration single-station and array measurements. The Middle-Chelif Basin is located in the central part of the Chelif Basin, the largest of the Neogene sedimentary basins in northern Algeria. This basin hosts the El-Asnam fault, one of the most important active faults in the Mediterranean area. In this seismically active region, most towns and villages are built on large unconsolidated sedimentary covers. Application of the horizontal-to-vertical spectral ratio (HVSR) technique at 164 sites, and frequency–wavenumber (F–K) analysis at 7 other sites, allowed for the estimation of the ground resonance frequencies, shear-wave velocity profiles, and sedimentary cover thicknesses. The electrical resistivity tomography method was used at some sites to further constrain the thickness of the superficial sedimentary layers. The soil resonance frequencies range from 0.75 Hz to 12 Hz and the maximum frequency peak amplitude is 6.2. The structure of the estimated shear-wave velocities is presented in some places as 2D profiles to help interpret the existing faults. The ambient vibration data allowed us to estimate the maximum depth in the Middle-Chelif Basin, which is 760 m near the city of El-Abadia.

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Imagery of the metamorphic bedrock roof of the Sahel active fault in the Sablettes (Algiers) reclaimed area by ambient vibration HVSR

Cited by 6 publications

References 66 publications

S‐wave velocity structure of Chlef City, Algeria, by inversion of Rayleigh wave ellipticity

S‐wave velocity structure of Chlef City, Algeria, by inversion of Rayleigh wave ellipticity

Synthesis on the Shear Wave Velocity of Engineering and Seismic Bedrocks in Northern Algeria based on Recent Experimental Investigations

Shallow S-Wave Velocity Structure in the Middle-Chelif Basin, Algeria, Using Ambient Vibration Single-Station and Array Measurements

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