Topography as a proxy for inter-plate coupling

Published on Nov 1, 2018in Journal of Geodynamics2.813
· DOI :10.1016/j.jog.2018.09.007
Debasis Pal1
Estimated H-index: 1
(NITR: National Institute of Technology, Rourkela),
Bhaskar Kundu12
Estimated H-index: 12
(NITR: National Institute of Technology, Rourkela),
M. Santosh85
Estimated H-index: 85
(University of Adelaide)
Abstract The topography of active mountain belts is shaped by long-term crustal deformation and strain from tectonic plates. To test this hypothesis, we correlated mean topography, topographic slope and GPS derived strain rates along the active orogenic belts of South America (Ecuador and northern Peru segments), where relatively rapid convergence occurs between the Nazca and South America plates. Our results show that the Ecuador and northern Peru segments follow well-defined power-law relation with distinct exponents that are consistent with the nonlinear deformation associated with dislocation-creep occurring at depth. We propose that the depth of dislocation-creep and distinct power-law exponents have first order control over mean topography, and that the topographic slope can be used as proxy for inter-plate coupling.
  • References (54)
  • Citations (1)
📖 Papers frequently viewed together
3 Citations
57 Citations
78% of Scinapse members use related papers. After signing in, all features are FREE.
6 CitationsSource
#1David MenierH-Index: 14
#2Manoj MathewH-Index: 7
Last. M. Santosh (University of Adelaide)H-Index: 85
view all 8 authors...
Empirical models have simulated the consequences of uplift and orographic-precipitation on the evolution of orogens whereas the effects of these forcings on ridgelines and consequent topography of natural landscapes remain equivocal. Here we demonstrate the feedback of a terrestrial landscape in NW Borneo subject to uplift and precipitation gradient owing to orographic effect, and leading to less-predictable flooding and irreversible damages to life and property. Disequilibrium in a large catchm...
9 CitationsSource
#1Muthuvairavasamy Ramkumar (Periyar University)H-Index: 2
#2David Menier (CNRS: Centre national de la recherche scientifique)H-Index: 14
Last. Numair Ahmed Siddiqui (UTP: Universiti Teknologi Petronas)H-Index: 7
view all 5 authors...
Abstract Intrinsic magmatic processes are considered as critical operators of plate movements. Here we demonstrate the role of extrinsic processes consequent to intrinsic processes as a catalyst for anomalous rapid plate movement. The rapid and accelerated flight of the Indian subcontinent since Deccan volcanism until its collision with Eurasia remains as one of the geological conundrums. Data on seismic tomography, peninsular geomorphology and inferences on continuum of subcrustal structures ar...
13 CitationsSource
#1Mu. Ramkumar (Periyar University)H-Index: 9
#2David Menier (CNRS: Centre national de la recherche scientifique)H-Index: 14
Last. M. Santosh (University of Adelaide)H-Index: 85
view all 4 authors...
Abstract The Indian subcontinent comprises accreted cratonic fragments that underwent subsequent rifting–subduction–collision processes along major mobile belts. It is also a storehouse of a prolonged history of crustal evolution involving repeated episodes of magmatism, volcanism, sedimentation, and metamorphism, and the formation of intracratonic and foreland basins. The geologic–geomorphic evolution of the Peninsula is recorded in relic faults/suture zones that confine Paleozoic, Mesozoic, an...
10 CitationsSource
#1V. L. Stevens (California Institute of Technology)H-Index: 2
#2Jean-Philippe Avouac (University of Cambridge)H-Index: 75
We determine the slip rate and pattern of interseismic coupling on the Main Himalayan Thrust along the entire Himalayan arc based on a compilation of geodetic, interferometric synthetic aperture radar, and microseismicity data. We show that convergence is perpendicular to the arc and increases eastwards from 13.3 ± 1.7 mm/yr to 21.2 ± 2.0 mm/yr. These rates are comparable to geological and geomorphic estimates, indicating an essentially elastic geodetic surface strain. The interseismic uplift ra...
106 CitationsSource
#1Susan L. Beck (UA: University of Arizona)H-Index: 50
#2George Zandt (UA: University of Arizona)H-Index: 51
Last. Alissa Scire (UA: University of Arizona)H-Index: 5
view all 4 authors...
19 CitationsSource
#1Philippe Vernant (University of Montpellier)H-Index: 29
#2Roger Bilham (CU: University of Colorado Boulder)H-Index: 51
Last. Théo Berthet (University of Montpellier)H-Index: 10
view all 10 authors...
GPS data reveal that the Brahmaputra Valley has broken from the Indian Plate and rotates clockwise relative to India about a point a few hundred kilometers west of the Shillong Plateau. The GPS velocity vectors define two distinct blocks separated by the Kopili fault upon which 2–3 mm/yr of dextral slip is observed: the Shillong block between longitudes 89 and 93°E rotating clockwise at 1.15°/Myr and the Assam block from 93.5°E to 97°E rotating at ≈1.13°/Myr. These two blocks are more than 120 k...
88 CitationsSource
Last. Hugo YepesH-Index: 23
view all 20 authors...
Regions of intense continental deformation, termed continental slivers, have been identified in Chile, Bolivia and Ecuador. Analyses of GPS data now identify another large sliver in Peru, the Inca Sliver, that is moving away from a neighbouring sliver in Ecuador—implying that moving continental slivers control the deformation of almost the entire Andean mountain range.
87 CitationsSource
#1Patience A. CowieH-Index: 38
#2C.H. Scholz (LDEO: Lamont–Doherty Earth Observatory)H-Index: 1
Last. Philippe SteerH-Index: 9
view all 5 authors...
Viscous flow in the deep crust and uppermost mantle can contribute to the accumulation of strain along seismogenic faults in the shallower crust1. It is difficult to evaluate this contribution to fault loading because it is unclear whether the viscous deformation occurs in localized shear zones or is more broadly distributed2. Furthermore, the rate of strain accumulation by viscous flow has a power law dependence on the stress applied, yet there are few direct estimates of what the power law exp...
23 CitationsSource
#1Greg Hirth (WHOI: Woods Hole Oceanographic Institution)H-Index: 50
#2David L. Kohlstedt (UMN: University of Minnesota)H-Index: 63
In this manuscript we review experimental constraints for the viscosity of the upper mantle. We first analyze experimental data to provide a critical review of flow law parameters for olivine aggregates and single crystals deformed in the diffusion creep and dislocation creep regimes under both wet and dry conditions. Using reasonable values for the physical state of the upper mantle, the viscosities predicted by extrapolation of the experimental flow laws compare well with independent estimates...
932 CitationsSource
Cited By1
#1Dibyashakti Panda (NITR: National Institute of Technology, Rourkela)H-Index: 2
#2Amit Mondal (IIT: Indian School of Mines)
Last. Bhaskar Kundu (NITR: National Institute of Technology, Rourkela)H-Index: 12
view all 3 authors...
Abstract We propose that topography can be used as a proxy for the eastward lateral “glacier-like flow” of the Tibetan crust in the Himalayan-Tibetan orogenic system. Geodetic observations across the Tibetan plateau indicate ∼22 mm/yr of crustal motion with respect to stable Eurasia by considering Newtonian channel flow model. Further, correlation between regional strain rate ( e ) and topographic elevation (h) is found to be statistically robust, with stress exponent (n) of 3.03 ± 0.1. Therefor...