Abstract
Topography has a great effect on ground motions, and may aggravate seismic hazards. The quantification of topographic effects is vital for hazard prevention in practice. A series of studies were conducted to achieve this quantification. First, three bell-shaped hills’ numerical models with three input motions for each were established and calculated using finite element method. Second, topographic variables that were closely related to the amplification factors were analysed and selected. Third, back propagation (BP) neural network models using different input variables were tested to quantify the topographic effect. Core methods used in this study were validated using recorded seismic data. The results showed that altitude, slope, aspect, and frequency are important variables that can affect topographic amplification factors. Thin hills or high frequencies of incident waves generally cause great amplification factors at crests. High-frequency waves tend to be captured by small-scale topography and induce amplifications of ground motions at these positions. Altitudes can be positively correlated with amplification factors when wavelengths of incident waves are apparently longer than the dimensions of local topography. Slopes generally do not have a good correlation with amplification factors for low hills until the upper part and lower part of a hill are separated for analysis, owing to slopes at the tops and feet of low hills being very similar. The BP neural network method is adequate for the quantification of the topographic effect. There are at least two combinations of input variables of BP models that can achieve good performance. One combination includes altitude, slope, aspect, and frequency, while the other includes altitude, x-axis gradient, y-axis gradient, and frequency. The former combination is less precise but has better expandability of the predictive region, while the latter combination is more precise but lacks expandability of the predictive region.
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Data Availability Statement
This manuscript has associated data in a data repository. [Authors’ comment: The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request].
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Acknowledgements
We thank Strong Motion Observation Center, Institute of Engineering Mechanics, China Earthquake Administration for providing the acceleration time histories of the mainshock of the Wenchuan earthquake, recorded by the Zigong topographic array. Part of the topographic data were provided by the Geospatial Data Cloud site, Computer Network Information Center, Chinese Academy of Sciences.
Funding
This research was partially supported by Spark Program of Earthquake Sciences (XH24024YC), Special project for cultivating scientific and technological innovation teams of Shandong Earthquake Agency (TD202303), National Key R&D Program of China (2022YFC3003503), Key Projects of Key Laboratory of Urban Security and Disaster Engineering of China Ministry of Education (2023), the Method and Demonstration of Earthquake-landslide Disaster Risk Zonation (Grant No. ZDJ2021-12).
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Jiang, Q., Wei, W., Xu, H. et al. A novel seismic topographic effect prediction method based on neural network models. Eur. Phys. J. Plus 138, 1032 (2023). https://doi.org/10.1140/epjp/s13360-023-04662-2
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DOI: https://doi.org/10.1140/epjp/s13360-023-04662-2