| Titre | Breaking the oceanic lithosphere of a subducting slab: The 2013 Khash, Iran earthquake |
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| Auteur | Barnhart, W D; Hayes, G P; Samsonov, S V ; Fielding, E J; Seidman, L E |
| Source | Geophysical Research Letters vol. 41, issue 1, 2014 p. 32-36, https://doi.org/10.1002/2013GL058096 |
| Année | 2014 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20150215 |
| Éditeur | Wiley-Blackwell |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1002/2013GL058096 |
| Media | papier; numérique; en ligne |
| Formats | pdf |
| Région | Khash; Iran |
| Lat/Long OENS | 61.0000 61.2500 28.2500 28.0000 |
| Sujets | subduction; lithosphère; croûte continentale; secousses séismiques; études séismiques; mécanismes de tremblement de terre; géophysique |
| Illustrations | cartes de localisation; profils; modèles |
| Diffusé | 2014 01 08 |
| Résumé | (disponible en anglais seulement)
Large intermediate-depth, intraslab normal-faulting earthquakes are a common, dangerous, but poorly understood phenomenon in subduction zones owing to a paucity
of near-field geophysical observations. Seismological and high-quality geodetic observations of the 2013 Mw7.7 Khash, Iran earthquake reveal that at least half of the oceanic lithosphere, including the mantle and entire crust, ruptured in a single
earthquake, confirming with unprecedented resolution that large earthquakes can nucleate in and rupture through the oceanic mantle. A rupture width of at least 55 km is required to explain both Interferometric Synthetic Aperture Radar observations
and teleseismic waveforms, with the majority of slip occurring in the oceanic mantle. Combining our well-constrained earthquake slip distributions with the causative fault orientation and geometry of the local subduction zone, we hypothesize that the
Khash earthquake likely occurred as the combined result of slab-bending forces and dehydration of hydrous minerals along a preexisting fault formed prior to subduction. |
| GEOSCAN ID | 296923 |
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