Taking apart the Big Pine fault: Redefining a major structural feature in southern California

Onderdonk, N.; Minor, Scott A.; Kellogg, Karl S.

doi:10.1029/2005tc001817

Cited by 4 publications

(2 citation statements)

References 18 publications

(50 reference statements)

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“…For example, in the western Transverse Ranges of California, Onderdonk et al (2005) a zone of deformation, populated by folds, refolded folds, and reverse faults trending oblique and parallel to the two main bounding faults, accommodated the rotation between the bounding faults. Bayona et al (2002) established the relationship between several transfer zones and rotations in the Southern Appalachians.…”

Section: Structures Accommodating Out-of-plane Motionmentioning

confidence: 99%

“…In areas where thrust terminations are unavailable (e.g., eroded or covered), or to determine more precise pivot locations, high-resolution arrays of paleomagnetic vertical-axis rotation measurements need to be collected and merged with structural studies that yield transport directions. We propose that, rather than having a unique geological marker, suites of geologic structures can help identify whether or not a rotation occurred (e.g., Allerton, 1998;Rumelhart et al, 1999;Onderdonk et al, 2005), when the rotation took place with respect to translation, and the approximate location of the rotational pivot.…”

Section: Models Of Vertical-axis Rotations Associated With Thrust Sheetsmentioning

confidence: 99%

See 1 more Smart Citation

The impact of vertical-axis rotations on shortening estimates

Sussman¹,

Pueyo²,

Chase³

et al. 2012

Lithosphere

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Section: Structures Accommodating Out-of-plane Motionmentioning

confidence: 99%

Section: Models Of Vertical-axis Rotations Associated With Thrust Sheetsmentioning

confidence: 99%

The impact of vertical-axis rotations on shortening estimates

Sussman¹,

Pueyo²,

Chase³

et al. 2012

Lithosphere

View full text Add to dashboard Cite

Long‐term fault slip rates, distributed deformation rates, and forecast of seismicity in the western United States from joint fitting of community geologic, geodetic, and stress direction data sets

Bird

2009

J. Geophys. Res.

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[1] The long-term average velocity field of the western United States is computed with a kinematic finite element code. Community data sets include fault traces, geologic offset rates, geodetic velocities, principal stress directions, and Euler poles. There is an irreducible minimum amount of distributed permanent deformation, which accommodates one third of Pacific-North America relative motion in California. Much of this may be due to slip on faults not included in the model. All data sets are fit at a common RMS level of 1.8 datum standard deviations. Experiments with alternate weights, fault sets, and Euler poles define a suite of acceptable community models. In pseudoprospective tests, fault offset rates are compared to 126 additional published rates not used in the computation: 44% are consistent; another 48% have discrepancies under 1 mm a À1 , and 8% have larger discrepancies. Updated models are then computed. Novel predictions include dextral slip at 2-3 mm a À1 in the Brothers fault zone, two alternative solutions for the Mendocino triple junction, slower slip on some trains of the San Andreas fault than in recent hazard models, and clockwise rotation of some domains in the eastern California shear zone. Long-term seismicity is computed by assigning each fault and finite element the seismicity parameters (coupled thickness, corner magnitude, and spectral slope) of the most comparable type of plate boundary. This long-term seismicity forecast is retrospectively compared to instrumental seismicity. The western United States has been 37% below its long-term average seismicity during 1977-2008, primarily because of (temporary) reduced activity in the Cascadia subduction zone and San Andreas fault system. Motivation[2] There are at least two reasons to pursue a unified kinematic model of ongoing deformation in each of the world's orogens: (1) Dynamic theory and modeling (which involve rheology, stress equilibrium, and driving forces) will be more nearly correct when they develop from a good kinematic description of what is actually happening. (2) Any complete kinematic model can be converted to a long-term seismicity forecast, from which seismic hazard maps and seismic risk statistics can be computed for guidance of public policy and personal choices.[3] This paper contributes to both goals. By computing minimum rates of distributed permanent deformation (between model fault traces), I will show that this distributed deformation accommodates a significant fraction of relative plate motion in California, and that kinematic or dynamic models with purely elastic microplates separated by a small number of plate boundary faults are not appropriate. By converting the preferred model to a long-term seismicity forecast which is independent of historical seismicity, I highlight regions in which future seismicity will probably be greater than historical seismicity. A subsidiary goal is to illustrate a process for mapping of long-term seismicity which is rule-based, objective, and transparent, while providing a mecha...

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Recent advancements in geochronology, geologic mapping, and landslide characterization in basement rocks of the San Gabriel Mountains block

Nourse¹,

Swanson²,

Lusk³

et al. 2020

From the Islands to the Mountains: A 2020 View of Geologic Excursions in Southern California

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This field trip examines Paleoproterozoic basement, Neoproterozoic metasedimentary strata, and crosscutting Mesozoic intrusive rocks at Frazier Mountain, Placerita Canyon, and Limerock Canyon in the western San Gabriel Mountains block, California. We present new U-Pb zircon geochronology results that constrain the Proterozoic through Cretaceous tectonic and magmatic history. The excursion ends in San Antonio Canyon in the eastern San Gabriel Mountains where several large rock avalanche deposits are sourced from distinct basement rocks. 10Be surface exposure ages and post-infrared infrared stimulated luminescence burial ages demonstrate late Pleistocene to Holocene movements for these landslides.

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Taking apart the Big Pine fault: Redefining a major structural feature in southern California

Cited by 4 publications

References 18 publications

The impact of vertical-axis rotations on shortening estimates

The impact of vertical-axis rotations on shortening estimates

Long‐term fault slip rates, distributed deformation rates, and forecast of seismicity in the western United States from joint fitting of community geologic, geodetic, and stress direction data sets

Recent advancements in geochronology, geologic mapping, and landslide characterization in basement rocks of the San Gabriel Mountains block

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