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The older the better? The strange case of empirical ground motion models in the near-source of moderate-to-large magnitude earthquakes

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Abstract

This paper aims at providing a quantitative evaluation of the performance of a set of empirical ground motion models (GMMs), by testing them in a magnitude and distance range (Mw = 5.5 ÷ 7.0 and Joyner-Boore source-to-site distance Rjb ≤ 20 km) which dominates hazard in the highest seismicity areas of Italy for the return periods of upmost interest for seismic design. To this end, we made use of the very recent release of the NESS2.0 dataset (Sgobba et al. NESS2.0: an updated version of the worldwide dataset for calibrating and adjusting ground motion models in near-source. Istituto Nazionale di Geofisica e Vulcanologia (INGV), 2021. https://doi.org/10.13127/NESS.2.0), that collects worldwide near-source strong motion records with detailed metadata. After selection of an ample set of GMMs, based on either their application in past seismic hazard assessment (SHA) studies or for their recent introduction, a quantification of between- and within-event residuals of predictions with respect to records was performed, with the final aim of shedding light on the performance of existing GMMs in the near-source of moderate-to-large earthquakes, also in view of their potential improvement by taking advantage of results from 3D physics-based numerical simulations.

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Data availability

The NESS2.0 dataset is freely available at the website http://ness.mi.ingv.it/ (Last access: June 6th 2021). The records from ITACA were downloaded from the ITalian ACcelerometric Archive, http://itaca.mi.ingv.it (Last access: March 12th 2021). The records from SIMBAD were provided by Chiara Smerzini (Politecnico di Milano).

Code availability

All the computations have been done using MATLAB (http://www.mathworks.com/products/matlab/). The authors don’t give their consent to share their routines.

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Acknowledgements

This work has been partially supported by swissnuclear within the research activity “Development of advanced numerical approaches for earthquake ground motion prediction”, in the framework of the Sigma2 project, and by the Department of Civil Protection within the ReLUIS project WP18 “Normative contributions related to seismic action”. The authors are sincerely grateful to Sreeram Reddy Kotha for providing fruitful suggestions about the interpretations of results, and to Ezio Faccioli and Chiara Smerzini for their useful comments. Researchers of INGV are gratefully acknowledged for making the NESS2.0 dataset available. The authors also wish to thank two anonymous reviewers for their valuable and detailed remarks which contributed significantly to improve our manuscript.

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Correspondence to Angela Chiecchio.

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Paolucci, R., Chiecchio, A. & Vanini, M. The older the better? The strange case of empirical ground motion models in the near-source of moderate-to-large magnitude earthquakes. Bull Earthquake Eng 20, 1325–1342 (2022). https://doi.org/10.1007/s10518-021-01304-9

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  • DOI: https://doi.org/10.1007/s10518-021-01304-9

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