Elastic modeling and tectonic geomorphic investigation of the Late Cenozoic Sierra Nevada (California) uplift

Different hypotheses attempt to explain the mechanism of late Cenozoic Sierra Nevada uplift. Two methods were used: elastic modeling and tectonic geomorphology. A computer model was created wherein geologically determined slip rates were imposed on modeled San Andreas Fault (SAF), Garlock (GF) and Sierra Nevada Frontal Fault zone to determine their effect on topography. Results slip on the SAF and GF created greater subsidence in the southern San Joaquin Valley.; The geomorphology of the Sierras was investigated through the longitudinal profiles of the rivers and geomorphic indices. Greater tectonic activity occurred in the southernmost Sierras, with the greatest near the Kern River.; Strike slip motion on the SAF and GF can explain the greater tectonic activity in the southern Sierras and San Joaquin Valley, without the need for mantle delamination, mantle drip, or westward migration of Basin and Range extension.