7. The Borah Peak, Idaho Earthquake of October 28, 1983—Landslides
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Abstract
The Borah Peak, Idaho earthquake caused several hundred landslides throughout an area of about 4,200 km 2 . The most numerous landslides were rock falls and rock slides, which occurred where slopes contained conspicuous, through‐going, open fractures or were composed of weakly cemented rocks. The earthquake also produced several slumps and cracks in man‐made fill, several soil liquefaction phenomena, a large debris flow, a large mud flow, and a few ground failures of other types. The most significant landslide damage was in Challis, where rock falls damaged at least 3 houses and 2 automobiles.