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A comparison of nonergodic ground-motion models based on geographically weighted regression and the integrated nested laplace approximation

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Abstract

Different nonergodic Ground-Motion Models based on spatially varying coefficient models are compared for ground-motion data in Italy. The models are based different methodologies: Multi-source geographically weighted regression (Caramenti et al. 2022), and Bayesian hierarchical models estimated with the integrated nested Laplace approximation (Rue et al. 2009). The different models are compared in terms of their predictive performance, their spatial coefficients, and their predictions. Models that include spatial terms perform slightly better than a simple base model that includes only event and station terms, in terms of out-of sample error based on cross-validation. The Bayesian spatial models have slightly lower generalization error, which can be attributed to the fact that they can include random effects for events and stations. The different methodologies give rise to different dependencies of the spatially varying terms on event and station locations, leading to between-model uncertainty in their predictions, which should be accommodated in a nonergodic seismic hazard assessment.

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Data availability

Availability of data is declared under Data and Resources section.

Code availability

Availability of code is declared under Data and Resources section.

Data and resources

The data used in this study is described in Lanzano et al. (2019) and Caramenti et al. (2020). Code and data can be found at https://github.com/nikuehn/NonErgGMM_Italy.

Notes

  1. https://www.r-inla.org/.

  2. See https://haakonbakkagit.github.io/btopic114.html for some informal advice on mesh generation.

  3. Also called Watanabe-Akaike information criterion.

  4. Using control.inla = list(int.strategy = "eb", strategy = "gaussian") in the INLA call.

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Acknowledgements

CV/MSLL and log-likelihood calculation follows ideas from the INLA Google group ( https://groups.google.com/g/r-inla-discussion-group/c/K49zsVxOYiw/m/GwEQGk1dAwAJ). Plots are made using the R package ggplot2 (Wickham 2016). The mesh plot was made via the package inlabru (Bachl et al. 2019). Other packages used are sp (Bivand et al. 2013), sf (Pebesma 2018), rgdal (Bivand et al. 2022). The MS-GWR code uses internally the package GWmodel (Gollini et al. 2015). Spatial plots (Figs. 5, 7, and 6) follow the style of Caramenti et al. (2020), from https://github.com/lucaramenti/ms-gwr/. I would like to thank Melanie Walling, Greg Lavrentiadis, Yousef Bozorgnia, Xiaofeng Ming, and Elnaz Seylabi, and the nonergodic working group at UC Berkeley/UCLA for fruitful discussions about INLA and nonergodic GMMs. I would like to thank Giovanni Lanzano and Luca Caramenti for clearing up some misunderstandings of MS-GWR on my part. Comments from Sreeram Kotha and an anonymous reviewer were very helpful to improve the manuscript. Partial support of Pacific Gas & Electric Company and California Department of Transportation are gratefully acknowledged. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author and do not necessarily reflect those of the sponsors.

Funding

This work was partially sponsored by the PG &E Geosciences Department and the California Department of Transportation.

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Correspondence to Nicolas Kuehn.

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Kuehn, N. A comparison of nonergodic ground-motion models based on geographically weighted regression and the integrated nested laplace approximation. Bull Earthquake Eng 21, 27–52 (2023). https://doi.org/10.1007/s10518-022-01443-7

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