Scarps produced during the Hebgen Lake earthquake of 1959 changed noticeably in 19 yr although they still appeared remarkably fresh in 1978. They have degraded much more rapidly than have those produced in 1915 and 1954 in Nevada, but a quasi-stable slope of more than 40° characterizes the Hebgen Lake scarps as compared to an upper limit of 37° on the Nevada scarps.

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