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NARROW
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all geography including DSDP/ODP Sites and Legs
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Imperial Valley (1)
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Lake Mead (1)
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North America
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Basin and Range Province (1)
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Primary terms
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deformation (1)
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earthquakes (5)
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faults (7)
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North America
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Basin and Range Province (1)
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plate tectonics (2)
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tectonics (3)
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United States
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California
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Garlock Fault (2)
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Los Angeles Basin (1)
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Salton Sea (1)
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San Gabriel Fault (1)
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Southern California (3)
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Transverse Ranges (2)
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Ventura Basin (1)
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Nevada
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Clark County Nevada (1)
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Lake Mead Fault (1)
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Las Vegas Valley (1)
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GeoRef Categories
Date
Availability
Mechanical Models of Fault‐Slip Rates in the Transverse and Peninsular Ranges, California Available to Purchase
Mechanical Models Suggest Fault Linkage through the Imperial Valley, California, U.S.A. Available to Purchase
Sensitivity of deformation to activity along the Mill Creek and Mission Creek strands of the southern San Andreas fault Open Access
Influence of Fault Geometry on the Spatial Distribution of Long‐Term Slip with Implications for Determining Representative Fault‐Slip Rates Available to Purchase
Secondary normal faulting in the Lake Mead fault system and implications for regional fault mechanics Available to Purchase
The hypothesized presence of a detachment underlying the Lake Mead region has created a dichotomy in the interpretations of the roles of strike-slip faults of the Lake Mead fault system in accommodating regional deformation. Our detailed field mapping reveals a previously unnamed left-lateral strike-slip segment of the Lake Mead fault system and a dense cluster of dominantly west-dipping and related normal faults located near Pinto Ridge. We suggest that the strike-slip fault that we refer to as the Pinto Ridge fault: (1) was kinematically related to the Bitter Spring Valley fault; (2) was responsible for the creation of the normal fault cluster at Pinto Ridge; and (3) utilized these normal faults as linking structures between separate strike-slip fault segments to create a longer, through-going fault. Results from numerical models demonstrate that the observed location and curving strike patterns of the normal fault cluster are consistent with the faults having formed as secondary structures as the result of the perturbed stress field around the slipping Pinto Ridge fault, regardless of whether or not the Pinto Ridge fault merges into a regional detachment at depth. Calculations of mechanical efficiency of various normal fault geometries within extending terranes suggest that a preferred west dip of normal faults likely reflects a west-dipping anisotropy at depth, such as a detachment. The apparent terminations of numerous strike-slip faults of the Lake Mead fault system into west-dipping normal faults suggest that a west-dipping detachment may be regionally coherent.