Skip to Main content Skip to Navigation
Theses

Cinématique et tectonique active de l'Ouest de la Grèce dans le cadre géodynamique de la Méditerranée Centrale et Orientale

Abstract : The Mediterranean is a diffuse plate boundary zone between the slowly converging Eurasian and African plates (~ 5mm/yr), where remnants of old Tethyan basins are progressively consumed by fast trench retreat (~20-30 mm/yr at the Hellenic subduction zone). In Eastern Mediterranean, a collision-subduction transition occurs in Western Greece (collision of the Apulian Platform to the north and Hellenic subduction zone to the south), close to the westward Corinth Rift termination and in a region that may be potentially affected by the westward propagation of the North Anatolian Fault. We used a multi-scale deformation approach to investigate Western Greece active kinematics:(1) We run a large scale model of horizontal crustal velocities measured by GPS to constrain the kinematic boundary conditions of Western Greece, both onshore and offshore. A major result is the occurrence of distributed N-S extension spreading from Bulgaria to the Eastern Corinth rift, resulting in de-activation of the western termination of the North Anatolian Fault in North Aegean Sea. This large scale extension could be associated to the retreat of the Hellenic slab.(2) An active tectonics study has been performed to provide an accurate mapping of active faults in the region, to constrain their relative chronology and to estimate their geological slip-rate. The Amvrakikos Gulf active half-graben and the N155° active Katouna-Stamna Fault, which form the northern and eastern boundaries of a Ionian Island-Akarnania block (IAB), have geological slip rates of at least ~ 4mm/yr and GPS slip-rates of ~ 10 mm/yr. The IAB is bounded to the west by the Kefalonia transform fault and appears to behave rigidly.(3) Once the IAB boundaries are defined, we show that the velocity field measured by GPS in the region can be totally accounted by transient elastic loading along the IAB bordering faults. Subduction interface coupling has no surface expression, suggesting low coupling. Finally, we justify the occurrence of a Rift-Fault-Fault triple junction at the western termination of the Corinth Rift.
Document type :
Theses
Complete list of metadatas

Cited literature [174 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00842274
Contributor : Abes Star :  Contact
Submitted on : Thursday, November 14, 2013 - 10:33:16 AM
Last modification on : Thursday, October 29, 2020 - 3:01:56 PM
Long-term archiving on: : Saturday, February 15, 2014 - 4:28:54 AM

File

VD2_PEROUSE_EUGENIE_16052013.p...
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-00842274, version 1

Collections

Citation

Eugénie Pérouse. Cinématique et tectonique active de l'Ouest de la Grèce dans le cadre géodynamique de la Méditerranée Centrale et Orientale. Sciences de la Terre. Université Paris Sud - Paris XI, 2013. Français. ⟨NNT : 2013PA112061⟩. ⟨tel-00842274⟩

Share

Metrics

Record views

1142

Files downloads

619