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.
Terra Nova – Wiley
Published: Nov 1, 1990
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