Oak Ridge Earthflow Observatory Data

Oak Ridge earthflow is a seasonally active earthflow located in the northern Diablo Range, 20 km northeast of San Jose, California. Positioned on the south-facing flank of Oak Ridge, it extends 1.35 km in the horizontal direction from ridge top to near the valley bottom, spans about 400 m of vertical relief, and has an average slope of 15°. The landslide body is composed of Franciscan mélange, an assemblage of variably deformed and metamorphosed rock units formed in a subduction zone during the Mesozoic and early Cenozoic eras.