title: Constraining the kinematics of metropolitan Los Angeles faults with a slip-partitioning model.
abstract: Due to the limited resolution at depth of geodetic and other geophysical data, the geometry and the loading rate of the ramp-décollement faults below the metropolitan Los Angeles are poorly understood. Here we complement these data by assuming conservation of motion across the Big Bend of the San Andreas Fault. Using a Bayesian approach, we constrain the geometry of the ramp-décollement system from the Mojave block to Los Angeles and propose a partitioning of the convergence with 25.5 ± 0.5 mm/yr and 3.1 ± 0.6 mm/yr of strike-slip motion along the San Andreas Fault and the Whittier Fault, with 2.7 ± 0.9 mm/yr and 2.5 ± 1.0 mm/yr of updip movement along the Sierra Madre and the Puente Hills thrusts. Incorporating conservation of motion in geodetic models of strain accumulation reduces the number of free parameters and constitutes a useful methodology to estimate the tectonic loading and seismic potential of buried fault networks.
authors.affiliation: ISTerre Université Grenoble-Alpes, CNRS Grenoble France.
authors.forename: S
authors.identifier: 0000-0003-0977-8954
authors.initials: S
authors.lastname: Daout
authors.affiliation: Earth Observatory of Singapore Nanyang Technological University Singapore.
authors.forename: S
authors.identifier: 0000-0003-4257-7409
authors.initials: S
authors.lastname: Barbot
authors.affiliation: Department of Earth Science University of California Los Angeles California USA; Jet Propulsion Laboratory California Institute of Technology Pasadena California USA.
authors.forename: G
authors.identifier: 0000-0002-7816-2443
authors.initials: G
authors.lastname: Peltzer
authors.affiliation: ISTerre Université Grenoble-Alpes, CNRS Grenoble France.
authors.forename: M-P
authors.initials: MP
authors.lastname: Doin
authors.affiliation: Jet Propulsion Laboratory California Institute of Technology Pasadena California USA.
authors.forename: Z
authors.identifier: 0000-0002-6313-823X
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Laboratoire de Géologie, UMR 8538, Departement de Géosciences École Normale Supérieure, PSL Research University Paris France.
authors.forename: R
authors.identifier: 0000-0002-9896-3651
authors.initials: R
authors.lastname: Jolivet
keywords: Bayesian approach; Puente Hills Thrusts; San Andreas Fault; Sierra Madre Thrusts; kinematic model; slip partitioning