Slab top dips resolved by teleseismic converted waves in the Hellenic subduction zone

Alexandrine Gesret 1 Mireille Laigle 2 Jordi Diaz 3 Maria Sachpazi 4 Marinos Charalampakis 4 Alfred Hirn 2
1 GEOSCIENCES - Centre de Géosciences
2 IPGP - Institut de Physique du Globe de Paris
3 CSIC - Consejo Superior de Investigaciones Científicas [Spain]
4 National Observatory of Athens
Abstract : The variations of the arrival times and polarities with backazimuth and distance of teleseismic P-to-S converted waves at interfaces bounding the slab crust under the upper plate mantle are used to constrain the depth, dip angle and azimuth of the slab of the Hellenic subduction zone. A grid search is designed to estimate the model parameters. Dip values of 16-18°, with an azimuth of 20° to 40°, are thus derived at 3 sites aligned over 50 km along the eastern coast of Peloponnesus. They are consistent with the variation from 54 to 61 km of the slab top depths constrained below each receiver. North of the Gulfs of Corinth and Evvia, a similar depth for the top of the slab is found at a distance from the subduction at least 100 km larger. This suggests flatter subduction of a different slab segment. Such a variation in slab attitude at depth across the region from south of the eastern Gulf of Corinth to north of Evvia is a candidate for the control of the recent or active localized crustal thinning of the upper plate we documented in earlier work, and of the surface deformation.
Keywords : Hellenic subduction converted waves receiver function slab dip
Type de document :
Article dans une revue
Liste complète des métadonnées

Littérature citée [21 références]  Voir  Masquer  Télécharger
https://hal-mines-paristech.archives-ouvertes.fr/hal-00678057
Contributeur : Alexandrine Gesret <>
Soumis le : jeudi 18 mai 2017 - 17:11:18
Dernière modification le : mercredi 7 août 2019 - 10:54:01
Document(s) archivé(s) le : lundi 21 août 2017 - 00:30:00

Fichier

Gesret_et_al-2011-Geophysical_...
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

INSTITUT-TELECOM | UPMC | ENSMP_GEOSCIENCES | INSU | IPGP | PSL | ENSMP | USPC | PARISTECH | CRL-WIDE | CRL | SORBONNE-UNIVERSITE | UNIV-PARIS7

Citation

Alexandrine Gesret, Mireille Laigle, Jordi Diaz, Maria Sachpazi, Marinos Charalampakis, et al.. Slab top dips resolved by teleseismic converted waves in the Hellenic subduction zone. Geophysical Research Letters, American Geophysical Union, 2011, 38, 5 p., L20304. ⟨10.1029/2011GL048996⟩. ⟨hal-00678057⟩

Exporter

BibTeX TEI DC DCterms EndNote

Partager

Métriques

Consultations de la notice

287

Téléchargements de fichiers

148

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD