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Optimizing seismic hazard inputs for co-seismic landslide susceptibility mapping: a probabilistic analysis

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Abstract

The significance of seismic hazard maps as inputs in co-seismic landslide susceptibility mapping is well-established. However, a research gap exists as no previous study has compared the effectiveness of various seismic hazard map inputs. The present research conducts a comprehensive comparative study, evaluating probabilistic seismic hazard assessment (PSHA)-based and specific scenario-based PGA maps as inputs for co-seismic landslide susceptibility mapping. In the study, the first step involved generating PSHA-based and scenario-based PGA maps, which served as seismic intensity inputs for the modified Newmark’s model. The modified model incorporates the rock joint shear strength parameters in displacement computations. To address uncertainties associated with the spatial variability of shear strength parameters of rock joints, Latin hypercube sampling along with Monte Carlo simulations were employed, resulting in a set of displacement values. The Latin hypercube sampling method ensured a more efficient and stratified sampling approach, enhancing the representation of uncertainty in the model. The simulations were conducted 10,000 times, generating 10,000 displacement values for each pixel. Subsequently, statistical calculations were performed to determine both the means and standard deviations of these displacement values, resulting in the creation of probability distributions. The predicted displacement probabilities surpassing 5 cm as threshold value were then displayed as landslide susceptibility maps. After generating the susceptibility maps, a comprehensive comparison was conducted based on various evaluation metrics, including confusion matrix, Kappa Coefficient, F1-score, and AUC-ROC values. The analysis revealed that the PSHA-based PGA input performed better than the scenario-based PGA input for co-seismic landslide susceptibility mapping.

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Code availability

Name of the code/library: MCS_CLSM. Hardware requirements: Minimum hardware requirements of MATLAB R2023a. Program language: Python. Software required: MATLAB, QGIS. Program size: 606 KB. The source codes are available for downloading at the link: https://github.com/KUN0206/MCS_CLSM.git.

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Acknowledgements

This work was supported by the Department of Science and Technology, India [Grant No. NGP/LS/TPN-34229/2019]. We are grateful to Drs. Lewis A. Owen, Milap Chand Sharma and Patrick Barnard for providing a co-seismic landslide inventory database of the 1999 Chamoli earthquake.

Funding

The work was financially supported by the Department of Science and Technology, India, under response project number NGP/LS/TPN-34229/2019.

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Contributions

KG: Formal analysis, Investigation, Validation, Conceptualization, Methodology, Resources, Software, Visualization, Writing—Original draft preparation. NS: Supervision, Writing—review & editing.

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Correspondence to Neelima Satyam.

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Gupta, K., Satyam, N. Optimizing seismic hazard inputs for co-seismic landslide susceptibility mapping: a probabilistic analysis. Nat Hazards (2024). https://doi.org/10.1007/s11069-024-06517-0

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