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Article Dans Une Revue Geophysical Research Letters Année : 2016

Constraining the Kinematics of Metropolitan Los Angeles Faults with a Slip-Partitioning Model

Résumé

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.
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Dates et versions

hal-02185459 , version 1 (20-05-2021)

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Simon Daout, Sylvain Barbot, Gilles Peltzer, Marie-Pierre Doin, Zhen Liu, et al.. Constraining the Kinematics of Metropolitan Los Angeles Faults with a Slip-Partitioning Model. Geophysical Research Letters, 2016, 43 (21), pp.11,192-11,201. ⟨10.1002/2016GL071061⟩. ⟨hal-02185459⟩
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