Site characterization of Algerian broadband seismic stations using earthquake and ambient vibration data: topographic and lithological site-effects investigation

Layadi, Khalissa; Semmane, Fethi; Yelles‐Chaouche, Abdelkrim; Saadi, Ahmed; Chimouni, Redouane; Haddad, Omar; Aïdi, Chafik

doi:10.1007/s10950-022-10126-4

Cited by 5 publications

(4 citation statements)

References 43 publications

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“…The seismic bedrock appears in the interpretation of the results obtained in Chlef city by [6], judged to be the origin of low-frequency amplification in the low Chéliff Fig. 1 The spatial distribution of ADSN (Algerian Digital Seismic Network) Broad-Band stations (yellow triangles) involved in the lithological site-effects investigation [14]. The distribution of recent studies used for the current synthesis is represented by the numbered red squares.…”

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

confidence: 99%

“…In their geotechnical analysis, they used the term "geotechnical bedrock" of marl formation, and has a Vs varying from 500 to 615 m/s. A recent study on site characterization of Algerian broadband seismic stations of ADSN by [14] allowed the estimation of Vs in seismic and engineering bedrock of installation sites of lithological site effects. In Fig.…”

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

confidence: 99%

“…3, some of the results indicate the Vs, the two bedrocks with their corresponding depths, and the geological age. More details on the geological formation are given in [14]. IV.…”

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

confidence: 99%

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

confidence: 99%

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

confidence: 99%

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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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“…2). Reference [3] provide detailed geological and geophysical investigations for the ADSN stations of Fig 1a and 1D deep Vs-structure (crust and upper mantle) can be found in [4].…”

Section: Introductionmentioning

confidence: 99%

Upper Mantle beneath Tunisia from Joint Shear-Wave Splitting and Rayleigh Wave Dispersion Analysis

2023

1st International Conference on Modern and Advanced Research Icmar 2023

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The current study aims to continue the analysis of the seismic anisotropy of Tunisia region and complete the previous studies of northwestern Africa, which helped to identify the deformations of the crust and the upper mantel, allowing us to obtain a geodynamic scenario for the southwestern Mediterranean. Tunisia is located on the boundary between the African and Eurasian plates. We used the method of splitting the shear wave SKS analysis of data from nine broadband seismic stations installed in Algeria, Tunisia, and the surrounding islands, Sardinia and Sicily, to explore the seismic anisotropy of this study area. We obtained 2D tomography of the shear wave velocity, Vs, structure of lithosphere and upper mantle depths ranging from 50 to 300 km using the Raleigh wave dispersion curve with the twostation technique in the 10-200 sec period domain. After analyzing hundreds of seismic data, we obtained the following results: multi-layer seismic anisotropy beneath TAMR and THTN seismic stations installed in northern Tunisia, while the southern station TATN has a single layer. The results of Vs-structure imaging of the second method also confirmed these results of the direction and depth of the deformed layers. Four distinct velocity bodies were found: two with low values (Vs is ~ 4 km/s) in the west and the east, and two with high values (Vs is ~ 5.5 km/s) in the north and the south of the study area.

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Geodynamic evolution of north-east Algerian basin: 3D velocity model Reveals high-temperature flow

Lamiri,

Radi,

Layadi

2024

Journal of African Earth Sciences

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Site characterization of Algerian broadband seismic stations using earthquake and ambient vibration data: topographic and lithological site-effects investigation

Cited by 5 publications

References 43 publications

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

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

Upper Mantle beneath Tunisia from Joint Shear-Wave Splitting and Rayleigh Wave Dispersion Analysis

Geodynamic evolution of north-east Algerian basin: 3D velocity model Reveals high-temperature flow

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