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Journal Article
Journal: Geology
Published: 22 March 2018
Geology (2018) 46 (5): 459-462.
... that climate-controlled rock weathering combined with bedload abrasion can produce systematic spatial variations in erodibility across bedrock streambed topography. Rock strength data from five channel reaches across the Big Island of Hawaiʻi show that upstream-oriented rock surfaces are stronger than...
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Journal Article
Journal: Geosphere
Published: 28 February 2018
Geosphere (2018) 14 (2): 604-625.
... strength of these sediments is a key parameter governing deformation during subduction, which is controlled to first order by lithologic composition. We combine here the results of laboratory friction experiments and quantification of mineral assemblage for scientific drilling samples recovered from three...
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Journal Article
Journal: Lithosphere
Published: 10 January 2018
Lithosphere (2018) 10 (2): 217-238.
... that this porous melt flow, focused along the deformation layering, significantly decreases the strength of the crustal section of the subducting continental lithosphere. As a result, detachment folds develop that decouple the shallower parts of the layered anatectic sequence from the underlying and continuously...
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Series: Geological Society, London, Special Publications
Published: 01 January 2018
DOI: 10.1144/SP459.1
EISBN: 9781786203403
... to differential stresses. Force chains are studied in numerical simulations and photo-elastic experiments, and are found to be the main reason why initial strain hardening occurs (e.g. Peters et al. 2005 ). The force chains controls the strength, the width and the dilatation of the shear bands. Force chains...
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Series: Geological Society, London, Special Publications
Published: 01 January 2017
DOI: 10.1144/SP439.8
EISBN: 9781862399716
... by the thickness and strength of the overlying salt section, as well as by the shapes of the extensional faults, and the magnitudes and slip rates along the faults. Upon inversion of these rift basins, the inherited extensional architectures, and particularly the continuity of the salt section, significantly...
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Series: Geological Society, London, Special Publications
Published: 01 January 2017
DOI: 10.1144/SP439.3
EISBN: 9781862399716
... Abstract: The rift basins of Thailand exhibit remarkable diversity of fault displacement patterns, fault length–displacement characteristics and mapped fault patterns during late rift, and post-rift, stages. These patterns reflect influences by: (1) zones of strength anisotropy in the pre-rift...
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Series: Geological Society, London, Special Publications
Published: 01 January 2017
DOI: 10.1144/SP439.16
EISBN: 9781862399716
... between different fault systems. An analysis of the geometry of 512 relay ramps from 13 different fault systems suggests that the main controls on aspect ratio are the strength of the sequence at the time of faulting and the underlying structure. Normal drag is defined as ‘folding adjacent to a fault...
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Series: Geological Society, London, Special Publications
Published: 01 January 2016
DOI: 10.1144/SP416.22
EISBN: 9781862397187
... and the mechanical strength. These characteristics allowed us to determine the material’s characteristics and properties for use in conservation and rehabilitation actions. For this purpose materials compatible with the original ones as characterized in this study must be used. Although there is great diversity...
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Series: GSA Memoirs
Published: 01 January 2015
DOI: 10.1130/2015.1212(03)
... into the expanding space of the mantle wedge. Another important factor in this evolution is the upper-plate lithospheric strength variations inherited from the different geologic basements underlying the northern and southern Puna regions. As the larger-scale delamination progressed, leaving behind thin lithosphere...
Series: GSA Reviews in Engineering Geology
Published: 01 January 2014
DOI: 10.1130/2014.4122(09)
EISBN: 9780813758220
... data for comparison with treated surfaces (e.g., Belnap et al., 2007 ). Testing methods typically include the measurement of dustemission potential or material strength after surface impact or disturbance. Qualitative measurements of dust-emission potential are typically made during efficacy testing...
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Series: GSA Special Papers
Published: 01 September 2010
DOI: 10.1130/2010.2465(23)
... influenced by the different strength properties of limestone and chert. Shatter cones are abundant throughout the Waqf as Suwwan central uplift, but they also occur prominently along its periphery. Other shock features, such as planar deformation features, planar fractures, and feather features, occur...
... to different background temperatures and a general upward distillation from mafic to felsic composition, and may be the most important control on crustal architecture and rheology. The strength of continental crust (and its potential for low-viscosity flow) is not simply a function of temperature, depth...
Series: GSA Reviews in Engineering Geology
Published: 01 January 2008
DOI: 10.1130/2008.4020(05)
EISBN: 9780813758206
... TABLE 3. Summary Of Strength Properties Used In Slope-Stability Analyses Geologic Unit c (kPa) ϕ(º) γ dry (kN/m 3 ) γ wet (kN/m 3 ) Advance outwash - Qva 10 38 18 20 Lawton Clay - Qvlc 29 26 17 19 Olympia beds (Qob) and older 19 34 18 20 Beach sands...
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Series: GSA Special Papers
Published: 01 January 2006
DOI: 10.1130/2006.2398(07)
... occurs ( A cr ) can be found by stating S d = S t in equations 3 and 4 and solving for area ( Whipple and Tucker, 2002 ): Figure 12. Sketch diagram showing the location of the detachment- to transport-limited transition and the influence of bedrock strength. The equilibrium...
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Journal Article
Journal: Geology
Published: 01 May 2002
Geology (2002) 30 (5): 419-422.
... Newfoundland and Ontario: Implications for microstructural preservation, strain rates, and strength of the lithosphere : Canadian Journal of Earth Sciences , v. 29 p. 328 – 337 . Calculated strain rates in the Slave mantle are between ∼10 −20 s −1 and ∼10 −5 s −1 ( Fig. 3, C and D ), using...
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Journal Article
Journal: Geology
Published: 01 May 2002
Geology (2002) 30 (5): 483.
... is unlikely to occur during subduction either at shallow mantle depths or in the lower part of the mantle transition zone” (p. 667). The purpose of this comment is to raise some questions about the experimental evidence used by Jin et al. (2001) in reaching their conclusions. The mechanical strength...
FIGURES
Journal Article
Journal: Geology
Published: 01 March 2002
Geology (2002) 30 (3): 271-274.
... their taper angle by modifying rock strength. We combine a model of groundwater flow with critical-taper theory to show that permeability and plate-convergence rate are important controls on accretionary wedge geometry through their influence on pore pressure. Low permeability and rapid convergence sustain...
FIGURES
Journal Article
Journal: Geology
Published: 01 February 2002
Geology (2002) 30 (2): 155-158.
... that corridor release more water during clay dehydration, which in turn elevates pore pressure and reduces basal shear stress relative to wedge strength. Conversely, dilution of smectite by illite and chlorite increases the frictional coefficient, and fluid overpressure should drop where smectite dehydration...
FIGURES
Journal Article
Published: 01 February 2002
Quarterly Journal of Engineering Geology and Hydrogeology (2002) 35 (1): 25-32.
...R.E. Fearon; M.R. Coop Abstract The paper examines behaviour of the soils from a landslide site in the Southern Apennines, demonstrating how the structure of the soil affects their strength, and that for such a complex, heterogeneous soil normalization of the data is necessary in order to identify...
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Journal Article
Journal: Geology
Published: 01 February 2001
Geology (2001) 29 (2): 189-190.
...Knut Bjørlykke Geological Society of America 2001 Townend and Zoback (2000) argued that faults keep the crust strong by increasing the permeability and thus preventing a build-up of overpressure. By maintaining hydrostatic pressures, the faults increase their frictional strength...