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Prediction of landslide hazards induced by potential earthquake in Litang County, Sichuan, China

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Abstract

The assessment of earthquake-induced landslide hazards is an important prerequisite for disaster prevention and reduction in tectonic active areas. However, few studies have considered the amplification effect of site and topography on ground motion parameters and made the peak ground acceleration (PGA) correction. Based on Newmark's method, taking Litang County, Sichuan Province, China, as the study area, considering the site amplification effect and topographic amplification effect, this paper carried out the assessment of landslide hazards under the action of occasional earthquakes with an exceedance probability of 10% and rare earthquakes with an exceedance probability of 2%. The results show that the hazard of earthquake-induced landslides is higher in the high slopes of loose rock in the middle of Litang County and the steep rock slopes with large topographic relief in the northeast, and low in the southern plateau and central basins. The site and topographic conditions have a significant effect on the nonlinear amplification of PGA, and the corrected PGA is even magnified by 2–3 times in steep mountains. Compared with the occasional earthquakes, the influence of rare earthquakes on the initiation and movement distance of landslides is remarkably improved. This study can provide a valuable reference for potential earthquake-induced landslide hazard assessment and seismic landslide emergency response in Litang County.

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The data used to support the findings of this study are available from the corresponding author upon request.

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Funding

This study was financially supported by the Second Tibetan Plateau Scientific Expedition and Research (STEP) Program (Grant No. 2019QZKK0905), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (22KJB560013), the National Earthquake Science Joint Foundation of China (No. U1939209), and the Open Fund of State Key Laboratory of Frozen Soil Engineering (Grant No. SKLFSE202009).

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JJ: Conceptualization, Methodology, Software, Formal analysis, Writing—original draft. ZW: Conceptualization, Funding acquisition, Resources, Supervision, Writing—review & editing. CC & WD: Formal analysis. WM: Supervision.

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Correspondence to Zhijian Wu.

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Jing, J., Wu, Z., Chu, C. et al. Prediction of landslide hazards induced by potential earthquake in Litang County, Sichuan, China. Nat Hazards 118, 1301–1314 (2023). https://doi.org/10.1007/s11069-023-06050-6

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  • DOI: https://doi.org/10.1007/s11069-023-06050-6

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