Study on the distribution characteristics and seismic hazard evaluation of loess seismic landslides in the southern Ningxia area
Abstract The unique topographical and geomorphological characteristics of the southern Ningxia area, coupled with the active seismic activity background, have led to loess earthquake-induced landslides becoming the predominant type of seismic geological disaster in this region. Among them, the lands...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-07-01
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| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-025-08195-9 |
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| Summary: | Abstract The unique topographical and geomorphological characteristics of the southern Ningxia area, coupled with the active seismic activity background, have led to loess earthquake-induced landslides becoming the predominant type of seismic geological disaster in this region. Among them, the landslides triggered by the 1920 Haiyuan M8.5 great earthquake are particularly typical and severe. This study is based on the detailed data of 600 loess earthquake-induced landslides within the study area obtained from field investigations, and provides a detailed and in-depth summary of the distribution characteristics of loess earthquake-induced landslides in the Ningnan area. The results show that the landslides in this area have typical characteristics such as gentle slope gradient of the developed slope, large scale of landslides, long sliding distance, wide disaster impact range, and strong group occurrence. Further analysis reveals that the spatial distribution of landslides is mainly influenced by the comprehensive effects of seismic motion intensity, loess cover thickness, type of fault rupture, and hydrological conditions. Based on the loess landslide geometric parameter database in southern Ningxia, this study applies a binary logistic regression model to successfully establish a rapid evaluation formula for the seismic stability of loess slopes in the study area. The discriminant accuracy of this formula can reach more than 95%, providing an efficient and accurate method for the seismic stability evaluation of loess slopes. On this basis, in combination with the geological model database of loess slopes in the study area, the rapid evaluation formula for the seismic stability of loess slopes is used to systematically evaluate the seismic stability of loess slopes in the study area under different seismic motion intensities, and finally six loess earthquake-induced landslide hazard zoning maps of the Ningnan area under different estimated seismic motion intensities are compiled. The research results of this paper not only enrich the theoretical system of seismic geological disaster research in the Ningnan area, but also provide a strong decision-making reference for the prevention and response strategy formulation of earthquake-induced landslide disasters in practical applications. |
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| ISSN: | 2045-2322 |