West Shore Lake Oroville Lineament Geologic Investigation, Northern California
Publication: Lifelines 2022
ABSTRACT
The ML5.7 1975 Oroville earthquake seven years after construction of Oroville Dam resulted in recognition of Quaternary activity along the Cleveland Hill fault (CHF) and Swain Ravine fault zone (SRF), located west of the Foothills fault system. A 10-km-long, north-south oriented zone of topographic lineaments including scarps, benches, and saddles identified on lidar coincide with possible northward extension of the CHF on the West Shore of Lake Oroville (WSLO) north of Oroville Dam. The lineaments are parallel with north-south oriented regional bedrock fabric. Field reconnaissance and four fault trench exposures revealed a robust correlation between differential erosion in the Jurassic meta-volcanic bedrock and the linear features. The resulting stepped topography is accentuated by side-hill-benches formed by colluvium that infills areas between resistant bedrock zones. A clay-rich saprolitic unit (175 ka) exposed across a prominent lineament in a trench in Bear Meadow was not faulted, precluding a faulting origin and seismogenic activity for the lineament zone.
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Lifelines 2022
Pages: 52 - 65
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Published online: Nov 16, 2022
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