Structure and seismicity of the Aegean subduction zone

Structure and seismicity of the Aegean subduction zone ABSTRACT Tomographic results show the presence of a high‐velocity anomaly dipping north beneath the Aegean Sea (Hellenic arc), down to a depth of at least 600 km. This anomaly is interpreted as the image of the subducting lithosphere of the African plate. No deep seismicity, however, is associated with this downgoing slab, although this would be expected on the basis of the age of the downbending lithosphere (approximately 100 Myr) and the inferred duration of the present ongoing episode of subduction. Using a thermo‐mechanical model for the subduction zone we find that the non‐stationary input of the subduction zone‐both in convergence rate and in thermal structure of the downgoing lithosphere ‐ adequately accounts for both the presence of a velocity anomaly associated with a slab and the absence of deep seismicity. The non‐stationarity follows from the large‐scale tectonic setting of the Eastern Mediterranean basin. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Terra Nova Wiley

Structure and seismicity of the Aegean subduction zone

Terra Nova, Volume 2 (6) – Nov 1, 1990

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Publisher
Wiley
Copyright
Copyright © 1990 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0954-4879
eISSN
1365-3121
DOI
10.1111/j.1365-3121.1990.tb00120.x
Publisher site
See Article on Publisher Site

Abstract

ABSTRACT Tomographic results show the presence of a high‐velocity anomaly dipping north beneath the Aegean Sea (Hellenic arc), down to a depth of at least 600 km. This anomaly is interpreted as the image of the subducting lithosphere of the African plate. No deep seismicity, however, is associated with this downgoing slab, although this would be expected on the basis of the age of the downbending lithosphere (approximately 100 Myr) and the inferred duration of the present ongoing episode of subduction. Using a thermo‐mechanical model for the subduction zone we find that the non‐stationary input of the subduction zone‐both in convergence rate and in thermal structure of the downgoing lithosphere ‐ adequately accounts for both the presence of a velocity anomaly associated with a slab and the absence of deep seismicity. The non‐stationarity follows from the large‐scale tectonic setting of the Eastern Mediterranean basin.

Journal

Terra NovaWiley

Published: Nov 1, 1990

References

  • Mechanics of subducted lithosphere
    Davies, Davies
  • Tomographic images of the upper mantle below central Europe and the Mediterranean
    Spakman, Spakman
  • The Hellenic subduction zone: a tomographic image and its geodynamic implications
    Spakman, Spakman; Wortel, Wortel; Vlaar, Vlaar
  • Deep earthquakes and the thermal assimilation of subducting lithosphere
    Wortel, Wortel

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