Jorge Jara, Hugo Sanchez-Reyes, Anne Socquet, Fabrice Cotton, Jean Virieux, Andrei Maksymowicz, John Diaz-Mojica, Andrea Walpersdorf, Javier Ruiz, Nathalie Cotte, Edmundo Norabuena
- We study the rupture processes of Iquique earthquake M-w 8.1 (2014/04/01) and its largest aftershock M-w 7.7 (2014/04/03) that ruptured the North Chile subduction zone. High-rate Global Positioning System (GPS) recordings and strong motion data are used to reconstruct the evolution of the slip amplitude, rise time and rupture time of both earthquakes. A two-step inversion scheme is assumed, by first building prior models for both earthquakes from the inversion of the estimated static displacements and then, kinematic inversions in the frequency domain are carried out taken into account this prior information. The preferred model for the mainshock exhibits a seismic moment of 1.73 x 10(21) Nm (M-w 8.1) and maximum slip of similar to 9 m, while the aftershock model has a seismic moment of 3.88 x 10(20) (M-w 7.7) and a maximum slip of similar to 3 m. For both earthquakes, the final slip distributions show two asperities (a shallow one and a deep one) separated by an area with significant slip deficit. This suggests a segmentationWe study the rupture processes of Iquique earthquake M-w 8.1 (2014/04/01) and its largest aftershock M-w 7.7 (2014/04/03) that ruptured the North Chile subduction zone. High-rate Global Positioning System (GPS) recordings and strong motion data are used to reconstruct the evolution of the slip amplitude, rise time and rupture time of both earthquakes. A two-step inversion scheme is assumed, by first building prior models for both earthquakes from the inversion of the estimated static displacements and then, kinematic inversions in the frequency domain are carried out taken into account this prior information. The preferred model for the mainshock exhibits a seismic moment of 1.73 x 10(21) Nm (M-w 8.1) and maximum slip of similar to 9 m, while the aftershock model has a seismic moment of 3.88 x 10(20) (M-w 7.7) and a maximum slip of similar to 3 m. For both earthquakes, the final slip distributions show two asperities (a shallow one and a deep one) separated by an area with significant slip deficit. This suggests a segmentation along-dip which might be related to a change of the dipping angle of the subducting slab inferred from gravimetric data. Along-strike, the areas where the seismic ruptures stopped seem to be well correlated with geological features observed from geophysical information (high-resolution bathymetry, gravimetry and coupling maps) that are representative of the long-term segmentation of the subduction margin. Considering the spatially limited portions that were broken by these two earthquakes, our results support the idea that the seismic gap is not filled yet. (C) 2018 Elsevier B.V. All rights reserved.…
MetadatenVerfasserangaben: | Jorge JaraORCiD, Hugo Sanchez-ReyesORCiD, Anne SocquetORCiD, Fabrice CottonORCiDGND, Jean Virieux, Andrei Maksymowicz, John Diaz-Mojica, Andrea Walpersdorf, Javier RuizORCiD, Nathalie Cotte, Edmundo NorabuenaORCiD |
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DOI: | https://doi.org/10.1016/j.epsl.2018.09.025 |
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ISSN: | 0012-821X |
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ISSN: | 1385-013X |
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Titel des übergeordneten Werks (Englisch): | Earth & planetary science letters |
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Untertitel (Englisch): | Understanding the segmentation of the seismogenic zone |
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Verlag: | Elsevier |
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Verlagsort: | Amsterdam |
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Publikationstyp: | Wissenschaftlicher Artikel |
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Sprache: | Englisch |
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Datum der Erstveröffentlichung: | 04.10.2018 |
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Erscheinungsjahr: | 2018 |
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Datum der Freischaltung: | 17.06.2021 |
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Freies Schlagwort / Tag: | high-rate GPS; kinematic inversion; megathrust earthquakes; strong Motion; subduction segmentation |
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Band: | 503 |
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Seitenanzahl: | 13 |
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Erste Seite: | 131 |
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Letzte Seite: | 143 |
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Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Umweltwissenschaften und Geographie |
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DDC-Klassifikation: | 5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften |
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Peer Review: | Referiert |
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