Application of morphotectonic indices for assessing active tectonics: A case study of Acheron river basin

IF 2.6 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
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引用次数: 0

Abstract

Rivers tend to alter the morphology of their bed and valley as a response to changes in their base level. The study of a drainage basin's tectonic activeness is very important. But especially in areas where rates of vertical tectonic movements are scarce, the morphometric analysis can be proved to be a very accurate method for assessing the effects of neotectonic movements on a drainage network. This method is easy to apply, as it does not require a lot of data. This study concerns the drainage basin of Acheron river in Epirus, Greece. In order to assess of river's response to active tectonic movements, a morphometric analysis was conducted, using a digital elevation model (DEM). Seven morphometric parametres and five geomorphic indices were calculated for the entire basin, as well as 9 sub-basins. Subsequently, each sub-basin was categorised into three categories regarding tectonic activeness (high-medium-low) for each index individually. The relative active tectonics index was also calculated, as the average of the aforementioned morphometric parametres and geomorphic indices. Based on that, each sub-basin was categorised into three categories regarding the overall tectonic activeness (low-medium-high). These results were compared with the drainage pattern and field observations, so as to gain insights on the tectonic activeness of the sub-basins and the entire basin of Acheron.

应用形态构造指数评估活动构造:阿克伦河流域案例研究
河流往往会因基面的变化而改变河床和河谷的形态。对流域构造活动性的研究非常重要。但特别是在缺乏垂直构造运动速率的地区,形态计量分析可以被证明是评估新构造运动对排水网络影响的一种非常准确的方法。这种方法不需要大量数据,易于应用。本研究涉及希腊伊庇鲁斯的阿克伦河流域。为了评估河流对活动构造运动的响应,使用数字高程模型(DEM)进行了形态计量分析。对整个流域以及 9 个子流域的 7 个形态参数和 5 个地貌指数进行了计算。随后,根据每个指数将每个子流域划分为三个构造活跃度类别(高-中-低)。此外,还计算出了相对活跃构造指数,即上述形态参数和地貌指数的平均值。在此基础上,将每个子流域的总体构造活跃程度分为三类(低-中-高)。将这些结果与排水模式和实地观测结果进行比较,以深入了解各子流域和整个阿克伦流域的构造活动性。
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来源期刊
Journal of Structural Geology
Journal of Structural Geology 地学-地球科学综合
CiteScore
6.00
自引率
19.40%
发文量
192
审稿时长
15.7 weeks
期刊介绍: The Journal of Structural Geology publishes process-oriented investigations about structural geology using appropriate combinations of analog and digital field data, seismic reflection data, satellite-derived data, geometric analysis, kinematic analysis, laboratory experiments, computer visualizations, and analogue or numerical modelling on all scales. Contributions are encouraged to draw perspectives from rheology, rock mechanics, geophysics,metamorphism, sedimentology, petroleum geology, economic geology, geodynamics, planetary geology, tectonics and neotectonics to provide a more powerful understanding of deformation processes and systems. Given the visual nature of the discipline, supplementary materials that portray the data and analysis in 3-D or quasi 3-D manners, including the use of videos, and/or graphical abstracts can significantly strengthen the impact of contributions.
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