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Abstract
Both creep and earthflow processes dominate hillslope erosion over large parts of the Redwood Creek basin. The type of process and the displacement rates are largely dependent on underlying bedrock type and precipitation. Progressive creep having rates ranging from 1.0 to 2.5 mm/a dominates on slopes west of the Grogan fault underlain by sheared and foliated schists. Movement appears to respond primarily to annual increments of precipitation. Complex earthfiows occur predominantly on slopes east of the Grogan fault underlain by sheared graywacke sandstone and mudstone. Movement rates range from 3.0 to 131.0 mm/a and characteristically display dominant rainy season movement.
Citation
Swanston, D. N.; Ziemerm, R.R. ; Janda, R.J. 1995. Rate and mechanics of progressive hillslope failure in the Redwood Creek basin, northwestern California. In: Nolan, K.M., H.M. Kelsey, and D.C. Marron, eds., Geomorphic processes and aquatic habitat in the Redwood Creek basin, northwestern California. U.S. Geological Survey Professional Paper 1454, Washington, DC: E1-16.
