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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

  • Mohamed Yacine Tebbouche
  • Djamel Machane
  • Souhila Chabane
  • El-Hadi Oubaiche
  • Aghiles Abdelghani Meziani
  • Dalila Ait Benamar
  • Hakim Moulouel
  • Ghani Cheikh Lounis
  • Rabah Bensalem
  • Abderrahmane Bendaoud
ArabGU2016
  • 611 Downloads
Part of the following topical collections:
  1. Current Advances in Geology of North Africa

Abstract

The Sablettes (Algiers) coastal reclaimed fringe region, located on the hanging wall of the Sahel active fault, is subject to different types of geological hazard such as flood and tsunami, coastal uplift, earthquake, liquefaction, landslide, and site effects. In this present work, we used ambient vibration HVSR for imaging the bedrock. The thickness of the sedimentary column under the backfill layer is unknown, and the coastal reclaimed areas are prone to strong amplification of seismic waves. The determination of the depth of the metamorphic base allowed us to establish a mapping of the bedrock roof surface. The 3D representation of this surface enabled us to present models of tectonic structures in this basement (i.e., fault, fold). This analysis will make it possible to make better evaluation of the amplification after having determined the depth of the metamorphic basement exceeding 240 m, which is supposed to have velocities close to those of the seismological basement, as well as the thicknesses of the different layers surmounting it.

Keywords

Bedrock imaging Ambient vibrations HVSR The Sablettes (Algiers) reclaimed area 

Notes

Acknowledgements

This work was supported by the PNR project (2011–2015) funded by the DGRSDT in collaboration between CGS and USTHB. The authors thank Remki M and Chatelain JL for their help about the English version and material data acquisitions. The authors also thank Professor Hamoudi M. and the two anonymous reviewers for their constructive suggestions which greatly improve our manuscript.

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Copyright information

© Saudi Society for Geosciences 2017

Authors and Affiliations

  • Mohamed Yacine Tebbouche
    • 1
    • 2
  • Djamel Machane
    • 2
  • Souhila Chabane
    • 1
  • El-Hadi Oubaiche
    • 2
  • Aghiles Abdelghani Meziani
    • 2
  • Dalila Ait Benamar
    • 2
  • Hakim Moulouel
    • 2
  • Ghani Cheikh Lounis
    • 1
  • Rabah Bensalem
    • 2
  • Abderrahmane Bendaoud
    • 1
  1. 1.FSTGAT-USTHBAlgiersAlgeria
  2. 2.CGSAlgiersAlgeria

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