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Spatial patterns, controlling factors, and characteristics of landslides triggered by strike-slip faulting earthquakes: case study of Lefkada island, Greece
Bulletin of Engineering Geology and the Environment ( IF 4.2 ) Pub Date : 2021-03-12 , DOI: 10.1007/s10064-021-02181-x
George Papathanassiou , Sotiris Valkaniotis , Athanassios Ganas

The correlation of coseismic landslides with the seismic and morphological parameters has been investigated in detail by many researchers, mainly after the devastating 2008 M8.0 Wenchuan, China earthquake. One of the goals of such studies is to examine the spatial distribution of the earthquake-induced landslides in order to establish a pattern depending on the type of the seismic fault. This research focusses on the island of Lefkada, Ionian Sea, Greece, that is considered one of the most prone to earthquakes regions in Europe due to its proximity to the Cephalonia Transform fault. Landslide data from the two shallow strike-slip faulting earthquakes that occurred on 2003 and 2015 are statistically analyzed in order to evaluate the landslide magnitude and area of slope failures and their frequency-area size distributions. Furthermore, the spatial distribution of failures was investigated in detail regarding its correlation to topography (slope angle, aspect, local relief, elevation), geology, and the characteristics of fault rupture. We conclude that the landslide pattern is not controlled by a single parameter and that it results from a combination and interaction of seismic, morphological, and geological factors. In particular, the parameters of slope angle, geology, and fault rupture/asperities are the ones that are clearly related to the highest landslide densities.



中文翻译:

由走滑断层地震引发的滑坡的空间格局,控制因素和特征:以希腊莱夫卡达岛为例

许多研究人员详细研究了同震滑坡与地震和形态参数之间的关系,主要是在经历了2008年汶川M8.0特大地震之后。这些研究的目的之一是检查地震引起的滑坡的空间分布,以便根据地震断层的类型建立模式。这项研究的重点是希腊爱奥尼亚海莱夫卡达岛,该岛由于靠近凯法利尼亚变换断层而被认为是欧洲最容易发生地震的地区之一。为了评估滑坡的大小和坡度破坏的面积及其频率-面积分布,对2003年和2015年发生的两次浅层走滑断层地震的滑坡数据进行了统计分析。此外,详细研究了断层与地形的相关性(坡度,纵横比,局部起伏,高程),地质情况以及断层破裂的特征,对断层的空间分布进行了详细研究。我们得出的结论是,滑坡模式不受单个参数控制,它是地震,形态和地质因素的结合和相互作用的结果。特别是,与最高滑坡密度明显相关的参数是坡度角,地质学和断层破裂/不规则度的参数。我们得出的结论是,滑坡模式不受单个参数控制,它是地震,形态和地质因素的结合和相互作用的结果。特别是,与最高滑坡密度明显相关的参数是坡度角,地质学和断层破裂/凹凸不平的参数。我们得出的结论是,滑坡模式不受单个参数控制,它是地震,形态和地质因素的结合和相互作用的结果。特别是,与最高滑坡密度明显相关的参数是坡度角,地质学和断层破裂/不规则度的参数。

更新日期:2021-03-12
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