Mass-transport deposits on the Algerian margin (Algiers area): morphology, lithology and sedimentary processes
| Autor: | Jacques Déverchère, Antonio Cattaneo, Nabil Sultan, K. Yelles, Gabriela Dan |
|---|---|
| Přispěvatelé: | Domaines Océaniques (LDO), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS), Unité de recherche Géosciences Marines (Ifremer) (GM), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), FUGRO FRANCE, FUGRO, Université européenne de Bretagne - European University of Brittany (UEB), Centre de Recherche en Astronomie Astrophysique et Géophysique (CRAAG), UnivBrestBU, AdminHAL |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Mass transport
triggering mechanism 010504 meteorology & atmospheric sciences [SDU.STU.GM] Sciences of the Universe [physics]/Earth Sciences/Geomorphology Lithology Submarine 010502 geochemistry & geophysics mass-transport deposit 01 natural sciences Matrix (geology) Paleontology Margin (machine learning) Epicenter Algeria morphology mass transport deposit Sedimentary rock Submarine pipeline [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology Geology Seismology 0105 earth and related environmental sciences |
| Zdroj: | ResearcherID Submarine Mass Movements and Their Consequences, " 4th International Symposium " Austin, Texas, November 8 – 11, 2009 4th International Symposium 4th International Symposium, Nov 2009, Austin, United States. in press Submarine Mass Movements and Their Consequences ISBN: 9789048130702 Ifremer HAL Scopus-Elsevier |
| Popis: | International audience; 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 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. |
| Databáze: | OpenAIRE |
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