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Topography as a proxy for inter-plate coupling

机译:地形作为板间耦合的代理

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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.
机译:活跃的山地带的地形是由于长期的地壳变形和构造板块的应变而形成的。为了检验这一假设,我们将南美(厄瓜多尔和秘鲁北部)活动造山带上的平均地形,地形坡度和GPS衍生的应变率进行了关联,在纳斯卡和南美板块之间发生了较快的收敛。我们的结果表明,厄瓜多尔和秘鲁北部的段遵循明确的幂律关系,具有不同的指数,这些指数与在深处发生的位错蠕变有关的非线性变形是一致的。我们提出位错-蠕变深度和不同的幂律指数对平均形貌具有一阶控制,并且该形貌的坡度可以用作板间耦合的代理。

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