"Rate and mechanics of progressive hillslope failure in the Redwood Creek basin, northwestern California"

D. N. Swanston; Robert Ziemer; R. J. Janda

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"Rate and mechanics of progressive hillslope failure in the Redwood Creek basin, northwestern California"

Informally Refereed

Authors:

D. N. Swanston, Robert Ziemer, R. J. Janda

Year:

1995

Type:

Miscellaneous Publication

Station:

Pacific Southwest Research Station

Source:

Pages E1-E16, 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.

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Abstract

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.

Keywords

PSW4351, hillslopes, erosion, earthflow, bedrock type, precipitation, graywacke sandstone, schist

Citation

Swanston, D. N.; Ziemer, R. R.; Janda, R. J. 1995. "Rate and mechanics of progressive hillslope failure in the Redwood Creek basin, northwestern California". Pages E1-E16, 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.