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Links between erosion, runoff variability and seismicity in the Taiwan orogen

机译:台湾造山带侵蚀,径流变化与地震活动之间的联系

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摘要

The erosion of mountain belts controls their topographic and structural evolution and is the main source of sediment delivered to the oceans. Mountain erosion rates have been estimated from current relief and precipitation, but a more complete evaluation of the controls on erosion rates requires detailed measurements across a range of timescales. Here we report erosion rates in the Taiwan mountains estimated from modern river sediment loads, Holocene river incision and thermochronometry on a million-year scale. Estimated erosion rates within the actively deforming mountains are high (3-6 mm yr~(-1)) on all timescales, but the pattern of erosion has changed over time in response to the migration of localized tectonic deformation. Modern, decadal-scale erosion rates correlate with historical seismicity and storm-driven runoff variability. The highest erosion rates are found where rapid deformation, high storm frequency and weak substrates coincide, despite low topographic relief.
机译:高山带的侵蚀控制着它们的地形和结构演变,是输送到海洋的主要沉积物来源。根据目前的救济和降水估算了山体侵蚀率,但是要对侵蚀率控制措施进行更全面的评估,就需要在一系列时间范围内进行详细测量。在这里,我们报告了台湾山区的侵蚀率,这些侵蚀率是根据现代河流沉积物负荷,全新世河流切口和百万分之一秒的测温法估算的。在所有时间尺度上,活动变形山中的估计侵蚀速率都很高(3-6 mm yr〜(-1)),但是随着局部构造变形的迁移,侵蚀方式随时间而改变。现代的年代际侵蚀速率与历史地震活动性和风暴驱动的径流变异性有关。尽管地形起伏不大,但在快速变形,高风暴频率和薄弱基底重合的地方,侵蚀率最高。

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