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
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阿尔及利亚边缘（阿尔及尔地区）的集体运输沉积物：形态、岩性和沉积过程
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
K. Yelles
中科院分区：
文献类型：
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作者：
G. Dan;N. Sultan;A. Cattaneo;J. Déverchère;K. Yelles
2003年5月21日，阿尔及利亚北方阿尔及尔以东40公里处的布米尔德斯地区发生了破坏性的6.9级地震。地震对阿尔及尔和德利斯之间的近海地区产生了毁灭性影响，观察到许多电缆断裂。最近利用地球物理和取样工具对2003年布米尔德斯震中（阿尔及利亚中部边缘）周围的海底区域进行了调查。据观察，小规模的幻灯片和质量传输存款发生在这个地区。因此，通过测量不同的形态参数，对水深从500 m到2700 m的25个海底滑坡进行了详细的分析（即表面、头崖高度、源区和邻近地区的坡度）。各种沉积物由基质支撑的泥碎屑组成，在最大规模滑坡附近和内部的重力岩心中观察到扭曲的层状沉积物和砂浊积岩床。根据这项工作和以前的研究，可以推测，经常性的地震活动可以被认为是在阿尔及利亚中部边缘失败的主要触发因素。
On 21st May 2003, a damaging earthquake of Mw: 6.9 struck the region of Boumerdes 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 Boumerdes 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 sandturbidite 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.