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Figure 17a. Landslide density (number of mapped landslides divided by the area in the log(q/T) category) for in-unit failures in the Noyo River watershed. Site is in Mendocino County of Northern California and landslides were mapped from 1996 aerial photographs by John Coyle. Categories are in - 0.3 units of log(q/T). Chronic means slope ³ friction angle (45 degrees in this case). Stable sites are too low a gradient to fail even if saturated, so effective precipitation needed for instability increases from left to right on this graph. Random scar size was 800 m2 and the median mapped scar size was 562 m2. |
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Copyright 1998, William Dietrich and David Montgomery
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