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Showing 1 to 20 of 20 for “"San Andreas Fault"”.
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Three-dimensional thermo-mechanical modeling of deformation at plate boundaries : case study San Andreas Fault System
… Pacific plate and the landward migration of the San Andreas plate boundary. One of the theories suggests that the Pacific plate first cools and captures the uprising mantle in the slab window, and then it causes the accretion of the continental crustal blocks. The alternative theory attributes …
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Earthquakes in complex fault settings: Examples from the Oregon Cascades, Eastern California Shear Zone, and San Andreas fault
… varies widely based on geologic settings. Normal faults within an intra-arc basin, strike-slip faulting within a wide shear zone, and creeping fault behavior all manifest differently and require a variety of techniques for analysis. In this dissertation I studied three different actively deforming …
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Exploration and application of post-infrared high-temperature infrared stimulated luminescence dating techniques: investigation of marine terrace deposits along the northern San Andreas Fault
… to a marine terrace that is displaced by the San Andreas Fault. Corals from the terrace along the Pacific plate, dated with U-series by Muhs et al. (2002), offer an age estimate. Comparison of the pIRIR ages to the U-series ages yield an underestimation, suggesting the pIRIR method may be more …
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Refraction Microtremor Analysis of Areas Surrounding California State University San Bernardino
<p>The San Andreas Fault stretches for over 800 miles through California. Along the foothills of the San Bernardino Mountains, areas in close proximity to the San Andreas Fault Zone may be subject to site amplification of ground motion caused by seismic activity via wave propagation through the …
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Fault formation in porous sedimentary rocks at high strain rates
Previous theoretical work suggests that faults in porous sedimentary rocks subjected to high strain rates do not form from deformation band damage zones (DBDZs) as typically observed in porous rocks. This hypothesis is evaluated by an investigation of faults mapped within the porous Navajo …
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Kinematic models of interseismic deformation in Southern California
… accumulation from active fults. We find that the San Andreas Fault slips close to Its Holocene rate in the Carrizo Plain (35.6 [plus-minus] 0.5 mm/yr) but is five times slower near San Bernadino (6.6 [plus-minus] 2.7 mm/yr). Thrust faults underneath Los Angeles, the Ventura Basin, and the San …
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Long-term exhumation of landscapes along the Pacific-North American plate boundary as inferred from apatite (U-Th)/He and ArcGIS analyses
… requires detailed case studies. The northern San Gabriel Mountains along the San Andreas fault and the Chugach-Kenai Mountains above the Aleutian subduction zone are located along highly tectonically active sections of the Pacific-North American plate boundary and have not been studied from …
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Tectonic Exhumation and Climate Driven Erosion in Extensional Mountain Blocks: Two Examples from California, USA
… are poor for inception of an extensional fault system linked to the southern San Andreas fault, a major tectonic element of this plate boundary. Furthermore, decades of research has shown relationships between climate, tectonics, and surface processes in most orogens across the globe (e.g. …
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New Constraints on Fault-Zone Structure from Seismic Guided Waves
The structure of fault zones (FZs) plays an important role in understanding fault mechanics, earthquake rupture and seismic hazards. Fault zone seismic guided waves (GW) carry important information about internal structure of the low-velocity fault damage zone. Numerical modeling of observed FZGWs …
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HYDROGEOLOGIC PROPERTY ESTIMATION IN PLATE BOUNDARY OBSERVATORY BOREHOLES USING TIDAL RESPONSE ANALYSIS
… Boundary Observatory (PBO) network along the San Andreas fault and Cascadia subduction zone. Permeability and hydraulic diffusivity determinations range from 6.4_10-16 – 8.4_10-14 m2 and 1_10-4 – 9_10-1 m2s-1, respectively, whereas specific storage values are ~1_10-6 m-1. Values are generally …
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Kinematic models of deformation in Southern California constrained by geologic and geodetic data
Using a standardized fault geometry based on the Community Block Model, we create two analytic block models of the southern California fault system. We constrain one model with only geodetic data. In the other, we assign a priori slip rates to the San Andreas, Garlock, Helendale, Newport-Inglewood, …
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Novel Multitemporal Synthetic Aperture Radar Interferometry Algorithms and Models Applied on Managed Aquifer Recharge and Fault Creep
… slow slip events (SSEs) along the Southern San Andreas Fault using multitemporal SAR interferometric time series from 2015-2021. These SSEs govern aseismic slip dynamics, manifesting as avalanche-like creep rate variations. The study further investigates Managed Aquifer Recharge (MAR) as a …
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QUALITATIVE COMPARISON OF OFFSET SURFACES BETWEEN THE CENTRAL AND EASTERN GARLOCK FAULT
<p>The Garlock Fault consists of three distinct segments, known as western, central, and eastern, together reaching approximately 260 km from the San Andreas Fault to the southern end of Death Valley. Although published slip rates are available along the western and central Garlock Fault segments, …
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Building Velocity Models for Steep-Dip Prestack Depth Migration through First Arrival Traveltime Tomography
… of sedimentary basins, such as major strike-slip faults, seismic reflectivity is often sparse and little is known of detailed subsurface geology. Alternate methods of velocity model construction must be used. First arrival (refraction and turning ray) traveltime tomography is proposed to construct …
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From Fault Dynamics to Seismic Hazard Assessment
… uncertainties, based on the study of active faults systems and dynamic modelling of the seismic cycle. I worked in particular on the probabilistic estimate of a fault‘s maximum magnitude earthquake and of its return period. Those parameters are indeed crucial to estimate seismic hazard. …
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Seismic imaging of the lithosphere-asthenosphere boundary with a dense broadband array in central California
… negative velocity gradient (NVG) west of the San Andreas Fault (SAF) and a gap in a NVG horizon east of the SAF. This is interpreted as prominent arrivals at the base of a partially subducted microplate that become undetectable as the plate dips too steeply east of the SAF for reliable …
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Remote Sensing Big Data and Physical Models for Resilience to Geohazards in the Water-Energy Nexus
… Finally, I revisit the Parkfield Paradox on the San Andreas Fault, where the anticipated M6.0 earthquake occurred 16 years later than predicted. By integrating seismicity records, creep measurements, and long-term fluid injection data from the nearby San Ardo oil field, I show that anthropogenic …