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Tectonic and Non-Tectonic Deformation in the Ventura Basin Region

Tectonic and Non-Tectonic Deformation in the Ventura Basin Region. Scott Marshall :: Appalachian State University Gareth Funning :: UC Riverside Susan Owen :: JPL. Geodetic Motions: InSAR and GPS. InSAR 1) Non-tectonic motions are present but not like Los Angeles

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Tectonic and Non-Tectonic Deformation in the Ventura Basin Region

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  1. Tectonic and Non-Tectonic Deformation in the Ventura Basin Region Scott Marshall :: Appalachian State University Gareth Funning :: UC Riverside Susan Owen :: JPL

  2. Geodetic Motions: InSAR and GPS InSAR 1) Non-tectonic motions are present but not like Los Angeles 2) Oil extraction subsidence is VERY localized GPS 1) ~N/S shortening 2) Contraction rates maximum across central Ventura basin 3) Contraction Decreases to both E&W

  3. GPS Inversion For Strain GPS Inversion (4 Station Nearest Neighbor Interpolation) 1) Strain rates are localized across the Ventura Basin 2) Max strain: Central Ventura Basin

  4. Slip Rates From Mechanical Models BEM Forward Models (See Marshall et al. 2009 JGR for method description) 1) Model slip rates generally agree with geologic rates 2) AnacapaDume and Red Mtn faults are fastest, but GPS cannot observe localized strain offshore 3) CFM Geom of Ventura fault produces ~2.4 mm/yr. Alternative geometries should be explored! Geologic Slip Rate Ranges Mechanical Model Slip Rate Ranges

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