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Detailed Reference Information |
Baccheschi, P., Margheriti, L. and Steckler, M.S. (2007). Seismic anisotropy reveals focused mantle flow around the Calabrian slab (Southern Italy). Geophysical Research Letters 34: doi: 10.1029/2006GL028899. issn: 0094-8276. |
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SKS splitting at the Calabrian subduction zone, with delay times (δt) up to 3s, reveals the presence of a strong anisotropic fabric. Fast directions ($phi$) are oriented NNE-SSW in the Calabrian Arc (C.A.) and rotate NNW-SSE to the north following the arcuate shape of the subducting plate. We interpret the trench-parallel $phi$ as local-scale mantle flow driven by the retrograde motion of the slab; the absence of trench perpendicular $phi$ below the Southern Apennines (S.A.) excludes the presence of a seismically detectable return flow at its NE edge. This may be due to the relative youth and limited width of the S.A. slab tear. A possible return flow is identified farther north at the boundary of the S.A. and Central Apennines. Different and weaker anisotropy is present below the Apulian Platform (A.P.). This implies that the influence of the slab rollback in the sub-slab mantle is limited to less then 100 km from the slab. |
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Abstract |
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Keywords
Seismology, Subduction zones (1207, 1219, 1240), Tectonophysics, Dynamics of lithosphere and mantle, general, Tectonophysics, Subduction zone processes (1031, 3060, 3613, 8413), Geographic Location, Europe |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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