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Figure 18. Comparison of stability fields and mapped landslide scars in the Oregon Coast Range. Landslide data were provided by Barry Williams of the Bureau of Land Management and were obtained by field mapping. Stability fields (as shown in Figures 13 and 14) are for a friction angle of 45 degrees and a bulk density ratio of 1.6. A value of log(q/T) = -3.1 effectively separates unstable from stable domains.
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Copyright 1998, William Dietrich and David Montgomery
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