Morphology and downslope sediment displacement in a deep-sea valley,the Valencia Valley (Northwestern Mediterranean) |
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Authors: | Suzanne O'Connell Belen Alonso Kim A. Kastens Andrés Maldonado Alberto Malinverno C. Hans Nelson Alberto Palanques William B. F. Ryan |
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Affiliation: | (1) Lamont Doherty Geological Observatory of Columbia University, 10964 Palisades, NY;(2) Instituto Jaime Almera, C.S.I.C., 08028 Barcelona, Spain;(3) U.S. Geological Survey, 94025 Menlo Park, CA |
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Abstract: | The Valencia Valley is a Quaternary, 200 km long deep-sea valley in the Valencia Trough, Western Mediterranean Sea. A swathmapping survey approximately mid-way along the valley length, where the floor has an average gradient of 1:250 (0.2°), shows valley walls that rise 200 to 350 m above the valley floor, with slopes of 2 to 18°. Sediment forming the walls is undergoing retrogressive, upslope-directed slumping with increasing bedding disruption along steeper walls. The valley exhibits a winding course with steep outer and gentler inner walls around bends, and bedforms on the valley floor. Lateral migration around bends is less than 5 km and the valley is deeply entrenched into Quaternary-bedded sediments. |
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