Deposition processes from echo-character mapping along the western Algerian margin (Oran–Tenes), Western Mediterranean

Domzig, A.; Gaullier, Virginie; Giresse, Pierre; Pauc, Henri; Déverchère, Jacques; Yelles, K.

doi:10.1016/j.marpetgeo.2008.05.006

Cited by 23 publications

(36 citation statements)

References 52 publications

(79 reference statements)

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“…The observed slides are small compared to those in other studied areas around the world (Booth et al 1993;Hampton et al 1996;McAdoo et al 2000;Hühnerbach and Masson 2004;Sultan et al 2004). In addition, a recent work in the western part of the Algerian margin, between the towns of Oran and Tenes, also documented small-scale slides, similar with those found in the Algiers area (Domzig et al 2008). Therefore, no significant size slide scars or significant recent deposits were identified in the study area that could probably be related to the 2003 event.…”

Section: Discussionsupporting

confidence: 64%

“…Following the Boumerdès event, numerous studies focussed on the area offshore of the epicenter in order to identify related tectonic deformation and earthquake-triggered deposits (Déverchère et al 2005;Domzig et al 2006;Dan 2007;Dan et al 2008;Domzig et al 2008;Yelles et al 2009;Cattaneo et al this volume). The central Algerian margin is characterized by a continental shelf of variable width and a steep continental slope (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…1). Well-developed canyons and slide scars shape the continental slope and the curvilinear escarpments (Dan 2007;Domzig et al 2008). Salt diapirs of different shape, length and orientation are also present within the abyssal plain ( Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Numerous small-scale slides and MTDs were identified and mapped across the Algerian margin based on the seafloor analysis and seismic echo-facies (Dan 2007;Domzig et al 2008;Cattaneo et al this volume). Recent studies focused on a few selected cases (S1 escarpment- Dan et al 2008;S2 escarpment-Nouguès et al this volume) allowed the identification of triggering mechanism of different slope failures.…”

Section: Introductionmentioning

confidence: 99%

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Mass-Transport Deposits on the Algerian Margin (Algiers Area): Morphology, Lithology and Sedimentary Processes

Dan

Sultan²,

Cattaneo³

et al. 2010

Submarine Mass Movements and Their Consequences

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Abstract:On 21st May 2003, a damaging earthquake of Mw: 6.9 struck the region of Boumerdès 40 km east of Algiers in northern Algeria. The seismic shocks had devastating effects in the offshore area between the cities of Algiers and Dellys, where numerous cable breaks were observed. The submarine area encompassing the 2003 Boumerdès epicenter (central Algerian margin) was recently investigated using geophysical and sampling tools. It has been observed that small-size slides and mass-transport deposits occur across this area. Thus, a detailed analysis was performed on 25 submarine slides identified in water depth from 500 m to 2700 m, by measuring different morphological parameters (i.e. surface, head-scarp height, slope in the source area and in adjacent areas). Various deposits consisting of matrix supported mud-clast, distorted stratified sediments and sand turbidite beds were observed in gravity cores near and within the most significant-size slide. Based on this work and previous studies it can be presumed that the recurrent seismic activity can be considered as the main triggering factor for failure in the central Algerian margin.

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Section: Discussionsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mass-Transport Deposits on the Algerian Margin (Algiers Area): Morphology, Lithology and Sedimentary Processes

Dan

Sultan²,

Cattaneo³

et al. 2010

Submarine Mass Movements and Their Consequences

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“…1). Previous studies (Dan 2007;Domzig et al 2009;Cattaneo et al this volume) showed the widespread presence of such small-size slides (usually about 0.2 km 2 ) across the Algerian margin. In addition, thin sand beds interlayered in mostly clayey deposits have been described in sediment cores and determined as the main predisposing factor.…”

Section: Introductionmentioning

confidence: 88%

Detailed Analysis of a Submarine Landslide (SAR-27) in the Deep Basin Offshore Algiers (Western Mediterranean)

Nouguès

Sultan

Cattaneo

et al. 2010

Submarine Mass Movements and Their Consequences

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On May 21, 2003 an earthquake with a magnitude of 6.8 (Mw) struck the city of Boumerdes, located on the coast near Algiers, and generated significant gravity flows recognized by numerous submarine cable breaks. In order to investigate a possible offshore imprint of past earthquakes in terms of sediment instabilities, we analyzed one of the numerous escarpments of tectonic origin existing on the Algerian margin. This escarpment, located about 50 km NE offshore Algiers is within water depths between 2,600-2,900 m and has an average slope of 4°. A variety of geotechnical (piezocone), geophysical (swath bathymetry, Chirp echosounder and high-resolution deep-towed side scan sonar) and sedimentological (sediment cores) techniques were used to realize this work. Our study focuses on a well-defined submarine landslide scar (called SAR27) revealed by side-scan sonar images. The SAR 27 slide is small in size (0.5 × 1.7 km), but exhibits a complex morphology including a 10-m high headwall scar, tilted blocks, an area of reworked sediment and a distal deposit. Correlations between in-situ measurements, sampling and CHIRP profile provided a comprehensive understanding of the slide geometry and emphasized the role of thin silty sand beds in the slide initiation. These silty sand beds are probably acting as liquefied slip surfaces, implying a translational displacement mode which correlates the slide morphology.

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Submarine Landslides Along the Algerian Margin: A Review of Their Occurrence and Potential Link with Tectonic Structures

Cattaneo

Babonneau²,

Dan

et al. 2010

Submarine Mass Movements and Their Consequences

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Deposition processes from echo-character mapping along the western Algerian margin (Oran–Tenes), Western Mediterranean

Cited by 23 publications

References 52 publications

Mass-Transport Deposits on the Algerian Margin (Algiers Area): Morphology, Lithology and Sedimentary Processes

Mass-Transport Deposits on the Algerian Margin (Algiers Area): Morphology, Lithology and Sedimentary Processes

Detailed Analysis of a Submarine Landslide (SAR-27) in the Deep Basin Offshore Algiers (Western Mediterranean)

Submarine Landslides Along the Algerian Margin: A Review of Their Occurrence and Potential Link with Tectonic Structures

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