Slope failures along the deformation front of the Cascadia margin: linking slide morphology to subduction zone parameters
- Riedel, Michael
- Cote, Michelle M.
- Urlaub, Morelia
- Geersen, Jacob
- Scholz, Nastasja A.
- Naegeli, Kathrin
- Spence, George D.
DOIAbstract
Marine acoustic data are used to map and characterize submarine slope failure along the accretionary prism of Cascadia. Two main styles of slope failure are identified: (1) failures with curved head scarps, which are predominantly associated with incoherent debris-flow deposits; and (2) failures with rectangular head scarps, which are predominantly associated with intact sediment blocks. Rectangular head scarps mostly occur on thrust ridges with slope angles <16° and ridge heights <650 m, whereas curved head scarps occur predominantly on steeper and higher ridges. Off Vancouver Island, failure style and head-scarp geometry also change with ridge azimuth. We propose that the curved head scarps and debris flows may be a result of higher kinet...
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