Site‐Effects Investigation in the City of Chlef (Formerly El‐Asnam), Algeria, Using Earthquake and Ambient Vibration Data

Layadi, Khalissa; Semmane, Fethi; Yelles‐Chaouche, Abdelkrim

doi:10.1785/0120150365

Cited by 25 publications

(27 citation statements)

References 24 publications

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“…(a) The local geology of Chlef City (modified from Talaganov et al ); black dots and inverted triangles are the locations of the ambient vibration measurements carried out by Layadi et al (); BB′ is the profile of ambient vibration measurements. (b) Zoning of Chlef City as a function of the observed HVSRN curves; magenta thumbtacks are the locations of borehole sites used in this study and detailed in Figure ; dashed black line shows the Chlef City limits.…”

Section: Introductionmentioning

confidence: 99%

“…Talaganov et al () obtained measurements of both the values and thicknesses of the Quaternary layers overlying the upper Miocene deposits (Figure ). More details about the soil‐profile models shown in Figure are given by Layadi et al (). Talaganov et al () reported

ρ =1632‐2040 kg / m^{3}

for soft soil

(V_{s} < 400m/s)

compared with

ρ =2142‐2500 kg / m^{3}

for stiff soil

(400 \leq V_{s} < 800 m/s)

and rocky soil

(V_{s} \geq 800 m / s)

.…”

Section: Introductionmentioning

confidence: 99%

“…Bragato, Laurenzano and Barnaba () proposed an automatic procedure to identify zones in a given study area, based on the degree of similarity among the observed HVSRN curves at many measurement points, using a genetic algorithm. Since our study area is small (~10 km 2 ), we performed a visual analysis of the HVSRN curves reported by Layadi et al () and delineated six zones (Figure b; Table ). The key features that define each zone are as follows: Z′1: A clear

f_{0}

in the low frequency domain, with HVSRN amplitudes higher than 5, and an unclear bump in the high‐frequency range (Figure b; Table ). Z″1: A clear

f_{0}

in the low frequency domain, with HVSRN amplitudes less than 5, and either a bump or a small amplitude in the high‐frequency range (Figure b; Table ). Z′2: A clear

f_{0}

in the low frequency domain, with HVSRN amplitudes less than 5, and a clear

f_{1}

in the high‐frequency range (Figure b; Table ). Z″2: A broad peak in the low frequency domain, with the HVSRN amplitudes less than or equal to 2, and a clear

f_{1}

in the high‐frequency range (Figure b; Table ). Z′3: A broad peak in the low frequency domain, with the HVSRN amplitudes less than or equal to 2 (Figure b; Table ). Z″3: A clear

f_{0}

observed at frequencies of ≥ 1 Hz (Figure b; Table ). …”

Section: Introductionmentioning

confidence: 99%

“…(a) HVSRN amplitude contouring as a function of distances and frequencies along the profile BB’ of Figure a; dashed black and white lines show the variation of the fundamental frequency

(f_{0})

and second frequency peak

(f_{1})

; those results are from Layadi et al (). (b) Examples of observed HVSRN curves obtained in each zone of Figure b.…”

Section: Introductionmentioning

confidence: 99%

“…The values were input into the Dinver software for the theoretical RWE calculations. We also considered the thickness of the Miocene layer estimated by Layadi et al (). The parameterisation of each input is represented by an interval of values that ranges between the minimum and maximum observed limits.…”

Section: Introductionmentioning

confidence: 99%

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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%

ρ =1632‐2040 kg / m^{3}

for soft soil

(V_{s} < 400m/s)

compared with

ρ =2142‐2500 kg / m^{3}

for stiff soil

(400 \leq V_{s} < 800 m/s)

and rocky soil

(V_{s} \geq 800 m / s)

.…”

Section: Introductionmentioning

confidence: 99%

f_{0}

in the low frequency domain, with HVSRN amplitudes higher than 5, and an unclear bump in the high‐frequency range (Figure b; Table ). Z″1: A clear

f_{0}

in the low frequency domain, with HVSRN amplitudes less than 5, and either a bump or a small amplitude in the high‐frequency range (Figure b; Table ). Z′2: A clear

f_{0}

in the low frequency domain, with HVSRN amplitudes less than 5, and a clear

f_{1}

in the high‐frequency range (Figure b; Table ). Z″2: A broad peak in the low frequency domain, with the HVSRN amplitudes less than or equal to 2, and a clear

f_{1}

in the high‐frequency range (Figure b; Table ). Z′3: A broad peak in the low frequency domain, with the HVSRN amplitudes less than or equal to 2 (Figure b; Table ). Z″3: A clear

f_{0}

observed at frequencies of ≥ 1 Hz (Figure b; Table ). …”

Section: Introductionmentioning

confidence: 99%

“…(a) HVSRN amplitude contouring as a function of distances and frequencies along the profile BB’ of Figure a; dashed black and white lines show the variation of the fundamental frequency