A numerical model of the Hellenic Subduction Zone: Active stress field and sea-level changes

• Published in: Geophysical research letters Vol. 23; no. 18; pp. 2485 - 2488
• Main Authors: Giunchi, C., Kiratzi, A., Sabadini, R., Louvari, E.
• Format: Journal Article
• Language: English
• Published: Washington, DC Blackwell Publishing Ltd 01.09.1996; American Geophysical Union
• Subjects: Earth sciences; Earth, ocean, space; Earthquakes, seismology; Exact sciences and technology; Geophysics; Internal geophysics; Islands; Mantle; Marine; Mathematical models; Plates; Seismic phenomena; Slabs; Solid-earth geophysics, tectonophysics, gravimetry; Stresses; Tectonics. Structural geology. Plate tectonics; Greece; Greek Aegean Islands; Aegean Sea; East Mediterranean; Mediterranean Sea; Europe; MED, Aegean Sea; Greece, Kriti; MED, Ionian Sea, Hellenic Subduction Zone; Crete, Greece; stress; eustacy; Crete; Quaternary; volcanic arcs; lithosphere; upper mantle; finite element analysis; earthquakes; Hellenides; island arcs; plate geometry; uplifts; numerical models; tomography; viscoelasticity; subsidence; two-dimensional models; subduction zones; Holocene; focal mechanism; plate convergence
• ISSN: 0094-8276; 1944-8007
• DOI: 10.1029/96GL02166

A 2‐D viscoelastic finite element model for subduction in the southern Aegean Sea allows us to study the distribution of stress and surface velocities in a vertical cross section through the island of Crete. Recent tomographic results constrain the geometry of the slab and the structure of the crust, lithosphere and mantle. Two models are considered, the first for passive subduction driven solely by slab pull, and the second one where active convergence between the African and Aegean plates is also included. Both models predict subsidence of the Hellenic trench and of Cretan trough; uplift of Crete and of the Aegean volcanic arc. The island of Crete is subject to differential uplift, highest in the southern part, with maximum rates of 1.5 and of 3.2 mm/yr for the two models, respectively. These results agree with the tectonic uplift inferred from Holocene sea‐level changes in the island. The style of stress within the modeled African and Aegean plates is in general agreement with the focal mechanisms of the largest earthquakes along the subduction zone.