Large-scale in situ rotational failure on a low-angle delta slope: The Foreslope Hills,Fraser Delta,British Columbia,Canada |
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| Authors: | B S Hart |
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| Institution: | (1) Geological Survey of Canada, P.O. Box 6000, V8L 4B2 Sidney, British Columbia, Canada;(2) Present address: Department of Geosciences, Pennsylvania State University, 16802-2713 University Park, Pennsylvania, USA |
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| Abstract: | The Foreslope Hills are a series of ridges and troughs covering over 60 km2 of the sea floor at the base of the Fraser Delta slope. Internally, the hills consist of blocks of prodelta and delta slope sediment (> 10.6 km3) bounded by offshore dipping faults and shear planes. Stratification within each block generally dips landward, indicating rotational failure. The amount of downslope translation of delta slope sediments was relatively minor. Deformation is restricted to a deep structural trough, suggesting failure resulted from yielding of soft underlying (early Holocene) prodelta sediments in the trough. |
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