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  Near-source magnitude scaling of spectral accelerations: analysis and update of Kotha et al.(2020) model

Kotha, S. R., Weatherill, G., Bindi, D., Cotton, F. (2022): Near-source magnitude scaling of spectral accelerations: analysis and update of Kotha et al.(2020) model. - Bulletin of Earthquake Engineering, 20, 1343-1370.
https://doi.org/10.1007/s10518-021-01308-5

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Kotha, Sreeram Reddy1, Autor
Weatherill, Graeme2, Autor              
Bindi, Dino2, Autor              
Cotton, Fabrice2, Autor              
Affiliations:
1External Organizations, ou_persistent22              
22.6 Seismic Hazard and Risk Dynamics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146032              

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Schlagwörter: Ground-motion model · Spectral accelerations · Magnitude scaling · Nearsource saturation · Within-model uncertainty · Heteroscedastic variability
 Zusammenfassung: Ground-motion models (GMMs) are often used to predict the random distribution of Spectral accelerations ( SAs ) at a site due to a nearby earthquake. In probabilistic seismic hazard and risk assessment, large earthquakes occurring close to a site are considered as critical scenarios. GMMs are expected to predict realistic SAs with low within-model uncertainty ( σμ ) for such rare scenarios. However, the datasets used to regress GMMs are usually deficient of data from critical scenarios. The (Kotha et al., A Regionally Adaptable Ground- Motion Model for Shallow Crustal Earthquakes in Europe Bulletin of Earthquake Engineering 18:4091–4125, 2020) GMM developed from the Engineering strong motion (ESM) dataset was found to predict decreasing short-period SAs with increasing M W ≥ Mh = 6.2 , and with large σμ at near-source distances ≤ 30km . In this study, we updated the parametrisation of the GMM based on analyses of ESM and the Near source strong motion (NESS) datasets. With Mh = 5.7 , we could rectify the M W scaling issue, while also reducing σμ at M W ≥ Mh . We then evaluated the GMM against NESS data, and found that the SAs from a few large, thrust-faulting events in California, New Zealand, Japan, and Mexico are significantly higher than GMM median predictions. However, recordings from these events were mostly made on soft-soil geology, and contain anisotropic pulse-like effects. A more thorough non-ergodic treatment of NESS was not possible because most sites sampled unique events in very diverse tectonic environments. We provide an updated set of GMM coefficients, σμ , and heteroscedastic variance models; while also cautioning against its application for M W ≤ 4 in low-moderate seismicity regions without evaluating the homogeneity of M W estimates between pan-European ESM and regional datasets.

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Sprache(n): eng - Englisch
 Datum: 2022-01-282022
 Publikationsstatus: Final veröffentlicht
 Seiten: 28
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1007/s10518-021-01308-5
GFZPOF: p4 T3 Restless Earth
 Art des Abschluß: -

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Titel: Bulletin of Earthquake Engineering
Genre der Quelle: Zeitschrift, SCI, Scopus
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 20 Artikelnummer: - Start- / Endseite: 1343 - 1370 Identifikator: ISSN: 1570-761X
ISSN: 1573-1456
CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals57
Publisher: Springer Nature