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Turbidite chronostratigraphy off Algiers, central Algerian margin: A key for reconstructing Holocene paleo-earthquake cycles ArchiMer
Babonneau, Nathalie; Cattaneo, Antonio; Ratzov, Gueorgui; Deverchere, Jacques; Yelles-chaouche, Abdelkarim; Lateb, Tassadit; Bachir, Roza Si.
Northern Algeria is threatened by moderate to large magnitude earthquakes resulting from the slow convergence between the African and European plates. Main active faults are located offshore along the Algerian coast, as exemplified by the 2003 Mw 6.9 Boumerdès earthquake. This event triggered numerous and widespread turbidity currents over ∼ 150 km along strike in the Algerian basin (reaching 2800 m of water depth) and demonstrates the multi-source and multi-path characteristics of earthquake-triggered turbidity flows along this margin segment. We rely on the sedimentological analysis of five cores located at the toe of the Algiers margin, close to the 2003 cable break sites, to explore the potential for Holocene turbidite paleoseismology. Radiocarbon...
Tipo: Text Palavras-chave: Algerian margin; Marine paleoseismology; Turbidite; Holocene.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00356/46701/46563.pdf
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Flexural behaviour of the north Algerian margin and tectonic implications ArchiMer
Hamai, Lamine; Petit, Carole; Abtout, Abdeslem; Yelles-chaouche, Abdelkarim; Deverchere, Jacques.
The Algerian margin formed through back-arc opening of the Algerian basin (Mediterranean Sea) resulting from the roll-back of the Tethyan slab. Recent geophysical data acquired along the Algerian margin showed evidence of active or recent compressive deformation in the basin due to the ongoing Africa-Eurasia convergence. Published data from four wide-angle seismic profiles have allowed imaging the deep structure of the Algerian margin and its adjacent basins. In this study, we converted these velocity models into density models, then into isostatic anomalies. This allowed us to image an isostatic disequilibrium (relative to a local isostasy model) reaching a maximum amplitude at the margin toe. Converting isostatic anomalies into Moho depth variations...
Tipo: Text Palavras-chave: Gravity anomalies and Earth structure; Continental margins: convergent; Dynamics of lithosphere and mantle; Lithospheric flexure; Crustal structure.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00639/75137/75444.pdf
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