Principal facts for gravity stations in the Sheep Hole/Cadiz Wilderness study area (CDCA-305), California

Bracken, Robert E.; Simpson, Robert W.

doi:10.3133/ofr82882

Cited by 3 publications

(2 citation statements)

References 1 publication

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“…Nearly 900 new gravity stations along and north of the Blue Cut fault zone were added to earlier coverage (Biehler and Rotstein, 1979;Biehler et al, 2004;Chapman and Rietman, 1974;Roberts et al, 2002;Bracken and Simpson, 1982) for this study. In addition, data from various theses from the University of California, Riverside, were reprocessed to a common datum and formula.…”

Section: Geophysical Datamentioning

confidence: 99%

Basin geometry and cumulative offsets in the Eastern Transverse Ranges, southern California: Implications for transrotational deformation along the San Andreas fault system

Langenheim

Powell

2009

Geosphere

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The Eastern Transverse Ranges, adjacent to and southeast of the big left bend of the San Andreas fault, southern California, form a crustal block that has rotated clockwise in response to dextral shear within the San Andreas system. Previous studies have indicated a discrepancy between the measured magnitudes of left slip on through-going eaststriking fault zones of the Eastern Transverse Ranges and those predicted by simple geometric models using paleomagnetically determined clockwise rotations of basalts distributed along the faults. To assess the magnitude and source of this discrepancy, we apply new gravity and magnetic data in combination with geologic data to better constrain cumulative fault offsets and to defi ne basin structure for the block between the Pinto Mountain and Chiriaco fault zones. Estimates of offset from using the length of pullapart basins developed within left-stepping strands of the sinistral faults are consistent with those derived by matching offset magnetic anomalies and bedrock patterns, indicating a cumulative offset of at most ~40 km. The upper limit of displacements constrained by the geophysical and geologic data overlaps with the lower limit of those predicted at the 95% confi dence level by models of conservative slip located on margins of rigid rotating blocks and the clockwise rotation of the paleomagnetic vectors. Any discrepancy is likely resolved by internal deformation within the blocks, such as intense deformation adjacent to the San Andreas fault (that can account for the absence of basins there as predicted by rigid-block models) and linkage via subsidiary faults between the main faults.

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Section: Geophysical Datamentioning

confidence: 99%

Basin geometry and cumulative offsets in the Eastern Transverse Ranges, southern California: Implications for transrotational deformation along the San Andreas fault system

Langenheim

Powell

2009

Geosphere

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“…The isostatic gravity map was created from 6799 gravity stations. Previously published data are from regional compilations (Biehler and Rotstein, 1979;Biehler and others, 2004;Chapman and Rietman, 1974;Roberts and others, 2002) and wilderness studies (Bracken and Simpson, 1982). Other more recent sources of data include various theses from the University of California at Riverside (e.g.…”

Section: Data Sources Reductions and Accuraciesmentioning

confidence: 99%

Preliminary Isostatic Gravity Map of Joshua Tree National Park and Vicinity, Southern California

Langenheim¹,

Biehler²,

McPhee³

et al. 2007

Open-File Report

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Southern California alluvial basins regional aquifer-systems analysis: A bibliography

Moyle¹,

Martin²,

Schluter³

et al. 1986

Open-File Report

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Principal facts for gravity stations in the Sheep Hole/Cadiz Wilderness study area (CDCA-305), California

Cited by 3 publications

References 1 publication

Basin geometry and cumulative offsets in the Eastern Transverse Ranges, southern California: Implications for transrotational deformation along the San Andreas fault system

Basin geometry and cumulative offsets in the Eastern Transverse Ranges, southern California: Implications for transrotational deformation along the San Andreas fault system

Preliminary Isostatic Gravity Map of Joshua Tree National Park and Vicinity, Southern California

Southern California alluvial basins regional aquifer-systems analysis: A bibliography

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