Incipient faulting near Lake Pillsbury, California, and the role of accessory faults in plate boundary evolution

Geology ◽  
2013 ◽  
Vol 41 (10) ◽  
pp. 1119-1122 ◽  
Author(s):  
Amanda M. Thomas ◽  
Roland Bürgmann ◽  
Douglas S. Dreger
Keyword(s):  
Plate Boundary

The role of the Polochic Fault as part of the North American and Caribbean Plate boundary: Insights from the infill of the Lake Izabal Basin

2020 ◽  
Vol 32 (6) ◽  
pp. 1347-1364
Author(s):  
Jonathan Obrist‐Farner ◽  
Andreas Eckert ◽  
Marek Locmelis ◽  
James L. Crowley ◽  
Byron Mota‐Vidaure ◽  
...  
Keyword(s):  
North American ◽  
Plate Boundary ◽  
Caribbean Plate ◽  
The North

scholarly journals Review of Iberia‐Eurasia plate‐boundary basins: Role of sedimentary burial and salt tectonics during rifting and continental breakup

2020 ◽  
Author(s):  
Nicolas Saspiturry ◽  
Benoit Issautier ◽  
Philippe Razin ◽  
Thierry Baudin ◽  
Riccardo Asti ◽  
...  
Keyword(s):  
Plate Boundary ◽  
Salt Tectonics ◽  
Continental Breakup

Guidance of commissural growth cones at the floor plate in embryonic rat spinal cord

Development ◽  
1990 ◽  
Vol 109 (2) ◽  
pp. 435-447 ◽  
Author(s):  
P. Bovolenta ◽  
J. Dodd
Keyword(s):  
Spinal Cord ◽  
Axon Guidance ◽  
Plate Boundary ◽  
Growth Cones ◽  
Floor Plate ◽  
Morphological Properties ◽  
Rat Spinal Cord ◽  
Commissural Axons ◽  
Carbocyanine Dye

The floor plate of the embryonic rat spinal cord has been proposed to act as an intermediate target that plays a role in the pattern of extension of commissural axons. To begin to examine the role of the floor plate in axon guidance at the midline, we have studied the precision of the commissural axon projection to and across the floor plate during development. To delineate the pathway, the fluorescent carbocyanine dye, Di-I, has been used as a probe. We show that commissural axons traverse the floor plate and turn rostrally at its contralateral border with remarkable precision. Axons were not observed to turn ipsilaterally and turned only upon reaching the contralateral edge of the floor plate. Virtually all commissural axons follow this route. The morphology of commissural growth cones was also examined. As they encountered the floor plate, commissural growth cones became larger and increased in complexity. The reorientation of axons in register with the floor plate boundary and the change in the morphological properties of commissural growth cones as they traverse the midline suggest that the floor plate may act as a guidepost with functions similar to cells that have been implicated in axon guidance in invertebrates.

Non-uniform nanoparticle concentration effects on moving plate boundary layer

2016 ◽  
Vol 94 (11) ◽  
pp. 1222-1227 ◽  
Author(s):  
A. Mehmood ◽  
M. Usman
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Plate Boundary ◽  
Convective Transport ◽  
Physical Parameters ◽  
Nanoparticle Concentration ◽  
Concentration Effects ◽  
Moving Plate ◽  
Layer Flow

The inclusion of small nano-sized particles in a pure fluid changes the material properties of the resulting mixture, called a nanofluid, significantly. To understand the role of material particles on the convection process one needs an efficient modeling of the nanofluid. The homogeneous modeling is observed to underpredict the rate of heat transfer. This fact motivates the utilization of non-homogeneous modeling. In this study we considered the classical Sakiadis moving plate boundary layer flow of a nanofluid. Non-homogeneous concentration, which is a consequence of convective transport of nanoparticles within the boundary layer, has been utilized to calculate the heat transfer enhancement. Effects of different physical parameters have been investigated on the expedition of heat transfer phenomena. It is noted that significant increase in the rate of heat transfer is observed when the nanoparticle concentration is non-uniform across the boundary layer.

The role of strike-slip fault systems at plate boundaries

1986 ◽  
Vol 317 (1539) ◽  
pp. 13-29 ◽  
Keyword(s):  
Relative Velocity ◽  
Velocity Vector ◽  
Significant Proportion ◽  
Plate Boundary ◽  
Strike Slip ◽  
Plate Boundaries ◽  
Poor Understanding ◽  
The Common ◽  
Orogenic Belts

A new analysis shows that most (59 %) plate boundaries have a relative velocity vector that is markedly oblique (greater than 22°) to the boundary normal. A significant proportion (14% ) have vectors that are nearly ( ± 22°) parallel to the boundary. Accommodation of the oblique motion usually involves strike-slip faulting, but the kinematic role of these faults differs at divergent and convergent boundaries. Four main types of plate-boundary related strike-slip faults are distinguished: ridge transforms, boundary transforms, trench-linked strike-slip faults and indent-linked strike-slip faults. Discrimination of the four types should be possible in ancient orogenic belts, but is complicated by the common reactivation of the strike-slip zones in other roles. Plate-boundary related strike-slip faults form major lineaments at the present day. Ridge transforms have a low preservation potential in continents. Boundary transforms and indent-linked faults often re-use old lineaments, but trench-linked strike-slip faulting is an effective method of forming new lineaments in continental crust. Strike-slip faulting in general is less commonly recognized in ancient orogenic belts than its abundance in present plate-boundary orogens requires. This under-recognition results both from poor understanding of strike-slip kinematics and from deeper prejudices about the way in which orogenic belts form.

Identification of a Pressure-Strain Correlation Based Bypass Transition Onset Marker

2021 ◽  
Author(s):  
Shanti Bhushan ◽  
Satish Muthu ◽  
Dibbon K. Walters
Keyword(s):  
Boundary Layer ◽  
Plate Boundary ◽  
Navier Stokes ◽  
Bypass Transition ◽  
Transition Flow ◽  
Free Stream Turbulence ◽  
Transitional Boundary Layer ◽  
Layer Region ◽  
Rapid Pressure

Abstract Temporally developing direct numerical simulations are performed for bypass transition flow with zero pressure gradient over a flat plate boundary layer for a range of free-stream turbulence intensities (Tu) of 1.4% to 6%. The objective is to understand the role of pressure-strain terms on bypass transition onset, and to propose and validate a phenomenological hypothesis for the identification of a robust transition onset marker for use in transition-sensitive Reynolds-averaged Navier-Stokes (RANS) simulations. Results show that transition initiates at a location where the slow pressure-strain term becomes more dominant than the rapid term in the pre-transitional boundary layer region. A simple transition onset marker based on one-point statistical quantities is derived from the scaling of the ratio of the slow and rapid pressure fluctuation source terms. The critical value of the marker is found to vary within a narrow range (+/- 3.2%), and satisfies previously identified criteria for a robust transition onset marker.

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