Evidence of seismites in coastal Quaternary deposits of western Oranie (northwestern Algeria) |
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| Authors: | Mohamed Amine Boukhedimi Amina Louni-Hacini Youcef Bouhadad Jean-François Ritz Djamel Machane Azzeddine Benhamouche Hamid Bourenane |
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| Institution: | 1.USTHB, University of Sciences and Technology Houari Boumerdiene, Laboratoire de Métallogénie et Magmatisme de l’Algérie, Faculté des sciences de la terre, de Géographie et Aménagement du Territoire FSTGAT,Bab Ezzouar,Algeria;2.CGS, National Center of Applied Research in Earthquake Engineering,H-Dey,Algeria;3.Laboratoire Géosciences Montpellier, UM-CNRS,Montpellier,France |
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| Abstract: | Coastal Quaternary deposits of western Oranie show typical soft-sediment deformations including sedimentary dykes, sand volcanoes, sismoslumps, thixotropic bowls, thixotropic wedges, diapir-like structures, and faults grading. Field observations indicate that these deformations exist at several levels of the studied deposits along the west Oranian coast. This study demonstrated that these structures are earthquakes-related, by analysis of potential trigger sources. Several arguments demonstrate the seismic origin: the depositional environment rich in water that located in an active tectonic region, the thixotropic nature of deformations and their large vertical and horizontal diffusion in the Quaternary series consistent with a seismic recurrence. This allows characterizing these Quaternary soft-sediment deformations as seismites that were triggered by earthquakes. |
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