Supplement to Project Geology Report:Auburn Dam. Seismic Evaluation of Auburn Damsite. Volume 4:Analysis of Faulting in the Auburn Damsite,

摘要

The report presents additional data and interpretations assembled by various consultants since publication of the Project Geology Report. A structural analysis of F-1based on overall geometry and observed slicken-sides is presented and are used to estimate potential directions and magnitudes of net slip along the F-1fault zone. Included as an appendix is a study by consultant Robert Compton titled 'Gouge and Associated Deformation Along Fault F-1,Auburn Damsite.'Some of the conclusions reached are: (1) Maximum net slip of a shear termed the Steeply Dipping shear is 13.4feet. (2) Displacement of the Steeply Dipping shear is the sum of episodic movements. (3) Post Steeply Dipping shear movement along F-1has a magnitude of between 2and 12feet. (4) Based on observed relationships, F-1may have moved last about 120million years before present. (5) Displacement on foliation structures producing similar styles of deformation due to different stresses separated by 110million years. Six appended drawings and 5included in the text which are color printed and/or oversize as well as 10color xerox prints are not included in the report because they could not be microfilmed. These drawings are available from the U.S. Bureau of Reclamation,Denver.