Regional Geophysics of the Basin and Range Province

Thompson, and G A; Burke, D. Barlow

doi:10.1146/annurev.ea.02.050174.001241

Cited by 133 publications

(66 citation statements)

References 48 publications

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“…Numerous geophysical studies performed in this region (Thompson and Burke, 1974) indicate the existence of an extensive low Q-low velocity zone in the upper mantle. In terms of discrimination, an mb(f) plot obtained for the Eurasian events recorded at ANMO can best be described as a shotgun pattern over most of the event magnitude range, with significant overlap of explosions and earthquakes of all focal depths.…”

Section: This Station Is Located In the Basin And Range Province Of Tmentioning

confidence: 96%

VFM Discrimination Results from a Ten Station Network

Savino¹,

Archambeau²,

Masso³

1980

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Section: This Station Is Located In the Basin And Range Province Of Tmentioning

confidence: 96%

VFM Discrimination Results from a Ten Station Network

Savino¹,

Archambeau²,

Masso³

1980

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“…0148-0227/98/98JB-01353509.00 may show orthorhombic symmetry [Thompson and Burke, 1974]. Here we investigate the consequences of fault segmentation on the earliest stages of graben development, fault segment linkage and pattern formation.…”

Section: Paper Number 98jb01353mentioning

confidence: 99%

Fault linkage: Three‐dimensional mechanical interaction between echelon normal faults

Crider¹,

Pollard²

1998

J. Geophys. Res.

280

158

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Abstract. Field observations of two overlapping normal faults and associated deformation document features common to many normal-fault relay zones: a topographic ramp between the fault segments, tapering slip on the faults as they enter the overlap zone, and associated fracturing, especially at the top of the ramp. These observations motivate numerical modeling of the development of a relay zone. A three-dimensional boundary element method numerical model, using simple fault-plane geometries, material properties, and boundary conditions, reproduces the principal characteristics of the observed fault scarps. The model, with overlapping, semicircular fault segments under orthogonal extension, produces a region of high Coulomb shear stress in the relay zone that would favor fault linkage at the center to upper relay ramp. If the fault height is increased, the magnitude of the stresses in the relay zone increases, but the position of the anticipated linkage does not change. The amount of fault overlap changes the magnitude of the Coulomb stress in the relay zone: the greatest potential for fault linkage occurs with the closest underlapping fault tips. Ultimately, the mechanical interaction between segments of a developing normal-fault system promote the development of connected, zigzagging fault scarps.

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“…Asthenospheric 'drag' (discussed below) can be ruled out, as the direction of absolute velocity of the plateau is SW, nearly perpendicular to the WNW direction of maximum horizontal compression. Thompson and Zoback [1979] have suggested that the overall state of compression in the Colorado Plateau interior may be related to its thick 'keel' of mantle lithosphere, the edges of which are subjected to a static 'ridge push' force (also discussed below) resulting from density contrasts by surrounding, less dense asthenosphere under the Basin and Range-Rio Grande rift. However, shallow (crustal level) density contrasts between the plateau and surrounding regions predict extensional stress differences in the upper crust along the margins of the plateau.…”

Section: Sources Of Stress In the Western United Statesmentioning

confidence: 99%

State of stress in the conterminous United States

Zoback¹,

Zoback²

1980

J. Geophys. Res.

829

383

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Inferring principal stress directions from geologic data, focal mechanisms, and in situ stress measurements, we have prepared a map of principal horizontal stress orientations for the conterminous United States. Stress provinces with linear dimensions which range between 100 and 2000 km were defined on the basis of the directions and relative magnitude of principal stresses. Within a given province, stress orientations appear quite uniform (usually within the estimated range of accuracy of the different methods used to determine stress). Available data on the transition in stress direction between the different stress provinces indicate that these transitions can be abrupt, occurring over <75 km in places. In the western United States, a region of active tectonism characterized by high levels of seismicity and generally high heat flow, the stress pattern is complex, but numerous stress provinces can be well delineated.

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Regional Geophysics of the Basin and Range Province

Cited by 133 publications

References 48 publications

VFM Discrimination Results from a Ten Station Network

VFM Discrimination Results from a Ten Station Network

Fault linkage: Three‐dimensional mechanical interaction between echelon normal faults

State of stress in the conterminous United States

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