Geological Complexity: a novel index for measuring the relationship between landslide occurrences and geological conditions

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-05-14 DOI:10.1007/s10064-025-04333-9

Yifan Zhang, Chunhao Wu, Peng Cui, Shujian Yi, Runjie Yuan, Zhenni Jiang, Yusheng Li, Weilin Kong

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Abstract

The types, triggers, and spatial distribution of landslides are closely related to the spatial complexity of geological conditions, which are indispensable factors in landslide susceptibility assessment. However, geological conditions often consider only a single index, leading to underutilization of geological information in assessing landslide hazards. In this research, “Geological Complexity” is proposed as a novel index, consisting of tectonic complexity, lithologic complexity, structural complexity and seismicity, representing the spatial heterogeneity of the materials and structures of geological bodies. The contributions of each complexity component to landslides are quantified using a model that combines the weight of evidence and the analytic hierarchy process and then integrated into the Geological Complexity indicator. The performance of this model was further validated with data from the Eastern Himalayan Syntaxis. The results show that the predictive accuracy of Geological Complexity in bedrock-triggered landslide assessment is higher than any individual components and other traditional indicators such as distance to fault and lithology. This suggests that Geological Complexity can more accurately measure the controlling role of geological conditions on the occurrence of landslides than other indices. Selecting multiple geological parameters is more effective than relying on a single parameter.

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地质复杂性：一种衡量滑坡发生与地质条件关系的新指标

滑坡的类型、成因和空间分布与地质条件的空间复杂性密切相关，是滑坡易感性评价中不可缺少的因素。然而，地质条件往往只考虑单一的指标，导致地质信息在滑坡灾害评估中的利用不足。本文提出了“地质复杂性”这一新的指标，它由构造复杂性、岩性复杂性、构造复杂性和地震活动性组成，反映了地质体物质和结构的空间异质性。采用证据权重与层次分析法相结合的模型，量化各复杂性分量对滑坡的贡献，并将其纳入地质复杂性指标。利用东喜马拉雅构造合带的数据进一步验证了该模型的有效性。结果表明，地质复杂性在基岩诱发滑坡评价中的预测精度高于任何单项指标和断层距离、岩性等传统指标。这表明地质复杂性比其他指标更能准确地衡量地质条件对滑坡发生的控制作用。选择多个地质参数比依赖单一参数更有效。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.