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Regarding the engineer’s explanation about a spring and lubrication, Wittke said, “A lot of landslides are caused by subsurface lubrication by ground moisture or water and things like that, or in this case, a spring.”
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Isn't ground moisture, water, and a spring, all water? I suppose in rare cases the "subsurface lubrication" could be oil seeping, but except for those rare instances what besides water? I doubt many landslides, fast or slow, were caused by spilled Anal-Eze.