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An engineering analysis of the Elder Creek landslide, Alpine County, California
AuthorWells , Mary E
Geological Sciences and Engineering
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The Elder Creek Landslide is comprised of failed material from the Relief Peak Formation and from the Eureka Valley and Table Mountain Formations of the Stanislaus Group. The total volume of failed material is approximately 2.67 x 106 cubic yards. The failure is a complex movement, a large circular failure with topples and flows, which has moved approximately 2 00 feet vertically with an angle of rotation of 15 degrees. There has been subsequent failures within the disturbed material. A unique set of circumstances, including a reduction of rock strength of the Relief Peak Formation lahar and an increase in shear stress from a high water table at the end of Tioga glaciation and movement along a fault, lead to the initial catastrophic failure. The failure has reached a state of equilibrium and is undergoing minor downslope movement related to increases in precipitation.
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SubjectElder Creek Landslide
Relief Peak Formation
Eureka Valley Formation
Table Mountain Formation
topples and flows
high water table
initial catastrophic failure