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Black Butte Lake, Stony Creek, California Geologic and Seismologic Investigation.
Final rept. 1984-1986,
CORPS OF ENGINEERS SEATTLE WA SEATTLE DISTRICT
Pagination or Media Count:
Black Butte Dam is located within a zone of expected major earthquake damage. In 1903 and 1906, the site was shaken moderately by the Willows event and the St. Andreas event. Faults shown on present day maps resulted from early reports on California geology. Prior to this study there was no consensus on detail or activity concerning the Black Butte Fault. The present study consists of extensive fieldwork and analysis of surface geology, subsurface geology, and geophysical data about the subsurface. Our evaluation of this data has led to the conclusion that the Black Butte Fault and Willows Fault system as proposed do not exist within 10 miles around the dam. Small distinct and separate faults might exist further away. Keywords Earthquake hazard, Black Butte Fault, Quaternary geology, Thrust faulting, Quaternary faulting, Maximum credible event, Coast Range thrust, Morphostratigraphic surface.
APPROVED FOR PUBLIC RELEASE