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首页> 外文期刊>Quaternary International >Temporal profiling of uplift rate along an active fault using river long profile in the Kuchchh region, Western India
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Temporal profiling of uplift rate along an active fault using river long profile in the Kuchchh region, Western India

机译：印度西部Kuchchh地区河长型材沿着河流长外形升起速率的时间谱

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摘要

River long profiles are widely used as tectonic event markers. Incision/uplift rate estimations based on the dating of river terrace or exposed scarp sediment give long-term averaged uplift rate values with the limitation of not giving the intermediate phases of highs and lows. On the other hand, GPS based estimates provide only decadalscale uplift rate estimates. In our study, we adopted the long profile inversion methodology to obtain a temporal profile of uplift rate history (over the Late Pleistocene-Holocene time period) along an active fault (the Kuchchh Mainland Fault) in Kuchchh region, western India, which has experienced several large magnitude earthquakes in recent past. We also used long profiles analysis to quantify the transient response of Kuchchh landscape to uplift activity along the Kuchchh Mainland Fault. Steepness index and chi profiles were estimated to display the spatial variability in landscape disequilibrium. Integral method-based chi profiles were used to obtain the optimum value of basin area exponent of the Stream Power Incision Model (SPIM). Our estimates provide a mean uplift rate value of 1.1?1.4 mm/yr along the Kuchchh Mainland Fault during the Late Pleistocene-Holocene period, which matches with the average uplift rate derived from other independent observations in this region. Further, a chronology of major tectonic phases from the estimated uplift rate time series also corroborates with field-based estimates of major incision events in Kuchchh region. We also tested the robustness and sensitivity of our uplift rate estimates to model parameters. Such data can be complementary to the existing sparsely (both spatially and temporally) distributed uplift rate database, which is imperative to seismic hazard assessment.
机译：河长型材被广泛用作构造事件标记。根据河流阶地或暴露陡坎沉积物给予长期的约会切口/抬升速率估算平均抬升速率值与不向高点和低点的中间阶段的限制。在另一方面，基于GPS的估计只提供decadalscale隆升速率的估计。在我们的研究中，我们采用了长廓反演方法获得隆升速率的历史沿Kuchchh区活动断层（该Kuchchh内地故障）的时间曲线（在晚更新世全新世时间段），印度西部，拥有经验丰富的几个大震级地震在最近的过去。我们还使用了长曲线分析，量化Kuchchh景观沿Kuchchh内地故障隆起活动的瞬态响应。陡度指数和卡配置文件估计，以显示景观不平衡的空间变异。积分方法基于智轮廓被用于获得流电源切口模型（SPIM）的流域面积指数的最佳值。我们的估计提供期间晚更新世全新世期间，其与从在该区域中的其他独立的观测得到的平均隆起速率相匹配1.1？1.4毫米/沿着Kuchchh内地故障年的平均隆起速率值。此外，主要构造阶段从估算抬升速率时间序列年表也证实与Kuchchh地区的主要切口事件的基于现场的估计。我们还测试了我们的隆升速率估计的鲁棒性和敏感性模型参数。这样的数据可以是对现有的稀疏（在空间和时间）分布隆起率数据库，这是迫切需要地震危险性评估互补性。

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