| Titre | Ground motion evaluation of moderate and large interface earthquakes along the Chilean subduction zone |
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| Auteur | Herrera, C; Cassidy, J F ; Dosso, S E; Bastias, N; Onur, T |
| Source | Bulletin of the Seismological Society of America 2020 p. 1-18, https://doi.org/10.1785/0120190265 |
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| Année | 2020 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20190298 |
| Éditeur | Seismological Society of America |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1785/0120190265 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Lat/Long OENS | -74.0000 -66.0000 -18.0000 -26.0000 |
| Lat/Long OENS | -76.0000 -66.0000 -28.0000 -38.0000 |
| Lat/Long OENS | -76.0000 -70.0000 -40.0000 -46.0000 |
| Sujets | zones de subduction; subduction; secousses séismiques; études séismiques; géophysique; tectonique; Sciences et technologie; Nature et environnement; Santé et sécurité |
| Illustrations | cartes de localisation; graphiques; histogrammes; modèles |
| Programme | Géoscience pour la sécurité publique Risques géologique du tremblement de terre |
| Diffusé | 2020 09 01 |
| Résumé | (disponible en anglais seulement)
Strong-motion observations of recent interface earthquakes along the Chilean subduction zone are evaluated with two ground-motion models (GMM). One GMM was
developed with Chilean data and the other with global data. The GMM developed with local Chilean data is found to have an overall better prediction performance than the GMM developed using a global data set. Using residual analysis with the Chilean
GMM as reference model due to its better performance, clear indications of an increase of short-period radiation for deeper earthquakes in north and central Chile were found, which may be related to frictional features on the interface such as
interseismic coupling, as found previously for other regions, such as Japan. Also, the Iquique earthquake, which featured a clear precursory slow-slip event, exhibits mostly negative between-event residuals at short periods for earthquakes before and
after the mainshock, indicating predominantly weaker short-period radiation. However, this trend is not observed in the aftershock sequence of the Illapel earthquake, which did not feature a significant slow-slip event nor precursory seismicity in
its rupture area. Finally, a poor predictive performance was found for the Chilean GMM in southern Chile, overpredicting most of the observations. Based on these results, it is proposed that future local GMMs should include corrections for depth,
regional effects and include earthquakes from southern Chile, as new data are becoming available in this region. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Au cours des 8 dernières années, quatre grands séismes de subduction (M> 7,7) (et de nombreux autres séismes de M> 5) ont frappé la marge
chilienne, du sud au nord. Dans cette étude, nous utilisons ces données sismiques modernes pour évaluer les variations dans les schémas de tremblement le long de la côte chilienne et nous les comparons aux niveaux de tremblement prévus actuellement
utilisés dans le code de construction chilien. L'objectif de cette science sismique est d'aider à la conception technique, à la prise de décision et d'atténuer l'impact des futurs séismes dans les zones de subduction du Chili et du Canada. |
| GEOSCAN ID | 315650 |
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