Present day kinematics of the Eastern California Shear Zone from a geodetically constrained block model

McClusky, S.; Bjornstad, S.C.; Hager, Bradford H.; King, Robert W.; Meade, Brendan J.; Miller, M. Meghan; Monastero, Francis C.; Souter, B. J.

doi:10.1029/2001gl013091

Cited by 152 publications

(165 citation statements)

References 19 publications

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“…In contrast, most other active ECSZ faults imaged in this data set exhibit low velocity gradients in the immediate vicinity of the fault, consistent with strain accumulation patterns around faults with larger locking depths of 10-20 km, the typical range of locking depths in this region (Meade and Hager, 2005;Miller et al, 2001;McClusky et al, 2001). For a series of sub-parallel strike slip faults that are relatively closely spaced, the corresponding overlapping strain fields have made it challenging to estimate independent slip rates from geodetic data; while the summed slip rate across the entire shear zone is well constrained, the individual fault rates are not.…”

Section: Geodetic Slip Ratesmentioning

confidence: 89%

Acceleration and evolution of faults: An example from the Hunter Mountain–Panamint Valley fault zone, Eastern California

Gourmelen

Dixon

Amelung

et al. 2011

Earth and Planetary Science Letters

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We present new space geodetic data indicating that the present slip rate on the Hunter Mountain-Panamint Valley fault zone in Eastern California (5.0±0.5 mm/yr) is significantly faster than geologic estimates based on fault total offset and inception time. We interpret this discrepancy as evidence for an accelerating fault and propose a new model for fault initiation and evolution. In this model, fault slip rate initially increases with time; hence geologic estimates averaged over the early stages of the fault's activity will tend to underestimate the present-day rate. The model is based on geologic data (total offset and fault initiation time) and geodetic data (present day slip rate). The model assumes a monotonic increase in slip rate with time as the fault matures and straightens. The rate increase follows a simple Rayleigh cumulative distribution. Integrating the rate-time path from fault inception to present-day gives the total fault offset.

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Section: Geodetic Slip Ratesmentioning

confidence: 89%

Acceleration and evolution of faults: An example from the Hunter Mountain–Panamint Valley fault zone, Eastern California

Gourmelen

Dixon

Amelung

et al. 2011

Earth and Planetary Science Letters

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“…Each fault segment makes up part of the boundary between two adjacent blocks (e.g., Souter, 1998;McClusky et al, 2001). The slip rate components on each fault segment are determined in an internally consistent manner by the projection of the relevant relative block velocity vector onto the fault plane (Fig.…”

Section: Block Modelingmentioning

confidence: 99%

Estimates of Seismic Potential in the Marmara Sea Region from Block Models of Secular Deformation Constrained by Global Positioning System Measurements

Meade¹

2002

Bulletin of the Seismological Society of America

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218

236

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We model the geodetically observed secular velocity field in northwestern Turkey with a block model that accounts for recoverable elastic-strain accumulation. The block model allows us to estimate internally consistent fault slip rates and locking depths. The northern strand of the North Anatolian fault zone (NAFZ) carries approximately four times as much right-lateral motion (ϳ24 mm/yr) as does the southern strand. In the Marmara Sea region, the data show strain accumulation to be highly localized. We find that a straight fault geometry with a shallow locking depth of 6-7 km fits the observed Global Positioning System velocities better than does a stepped fault geometry that follows the northern and eastern edges of the sea. This shallow locking depth suggests that the moment release associated with an earthquake on these faults should be smaller, by a factor of 2.3, than previously inferred assuming a locking depth of 15 km.Online material: an updated version of velocity-field data.

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“…Modeled blocks here are similar to those defined by McClusky et al [2001] and McCaffrey [2005]. Block velocities in this region were all to the northwest and ranged from 8.0 ± 0.3 mm/a in block 30 to 11.8 ± 0.2 mm/a in block 29.…”

Section: Basin-range Kinematicsmentioning

confidence: 55%

Intraplate deformation and microplate tectonics of the Yellowstone hot spot and surrounding western U.S. interior

Puskas¹,

Smith²

2009

J. Geophys. Res.

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[1] Contemporary deformation of the Yellowstone hot spot and surrounding western United States is analyzed using tectonic microplate modeling, employing constraints from GPS observations corrected for postseismic deformation of M7+ earthquakes, fault slip rates, and earthquake focal mechanisms. We focus primarily on the kinematics of the Yellowstone hot spot and the eastern Snake River Plain volcanic field (ESRP), and secondarily on Basin-Range and Columbia Plateau provinces. Our results reveal southwest motion of the Yellowstone Plateau, excluding localized volcanic deformation, at 0.9 ± 0.1 mm/a that decreases to 0.8 ± 0.1 mm/a in the ESRP block. The southwest to west motion of the Yellowstone-ESRP introduces shear in the northern Rocky Mountain block, which is translating east at 0.78 ± 0.08 mm/a. There is <0.5 mm/a differential motion between the ESRP and the block at its northern boundary and none at the southern boundary. The eastern Basin-Range block moves west at 3.0 ± 0.1 to 4.6 ± 0.1 mm/a, while velocities of the western Basin-Range microplates rotate to a northwest direction, accompanied by a transition from normal to oblique shear deformation. Columbia Plateau block velocities are notably eastward, an effect enhanced by postseismic relaxation following the M9 1700 Cascadia subduction zone paleoearthquake. This study reveals that the overall motion of the western United States is characterized by clockwise rotation, with westward extension and northwest shear in the Basin-Range province, northeast to east contraction in the Columbia Plateau, and southwest extension of the YellowstoneSnake River Plain block that is driven by the high gravitational potential of the Yellowstone swell.Citation: Puskas, C. M., and R. B. Smith (2009), Intraplate deformation and microplate tectonics of the Yellowstone hot spot and surrounding western U.S. interior,

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Present day kinematics of the Eastern California Shear Zone from a geodetically constrained block model

Cited by 152 publications

References 19 publications

Acceleration and evolution of faults: An example from the Hunter Mountain–Panamint Valley fault zone, Eastern California

Acceleration and evolution of faults: An example from the Hunter Mountain–Panamint Valley fault zone, Eastern California

Estimates of Seismic Potential in the Marmara Sea Region from Block Models of Secular Deformation Constrained by Global Positioning System Measurements

Intraplate deformation and microplate tectonics of the Yellowstone hot spot and surrounding western U.S. interior

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