Geotechnical aspects of fine-grained mass flow deposits: California Continental Borderland |
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| Authors: | F J Hein D S Gorsline |
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| Institution: | (1) Department of Geological Sciences, University of Southern California, 90007 Los Angeles, CA;(2) Present address: Department of Geology, University of Alberta, Edmonton, Alberta, Canada |
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| Abstract: | Seismic reflection profiling demonstrates the importance of mass movement in the north-central California Borderland. Bulk
properties of surficial hemipelagic sediments in the Santa Barbara, Santa Cruz, and San Nicolas basins show that different
types of mass-transported sediments have different properties, although their general sedimentologic characteristics are very
similar. Slump deposits have moderate water contents (48% wet weight basis), high plasticity indices (46%), and moderate activities
(1.6). For debris flows these values are low: 28%, 5%, and 0.3, respectively, and for other types (liquefied flow, mudflows,
and turbidities) the values are high: 54 to 63%, 49 to 58%, and 1.2 to 1.5, respectively. |
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