Upper-mantle fabrics beneath the Northern Apennines revealed by seismic anisotropy

0394781 - GFÚ 2014 RIV US eng J - Journal Article
Munzarová, Helena - Plomerová, Jaroslava - Babuška, Vladislav - Vecsey, Luděk
Upper-mantle fabrics beneath the Northern Apennines revealed by seismic anisotropy.
Geochemistry, Geophysics, Geosystems. Roč. 14, č. 4 (2013), s. 1156-1181. E-ISSN 1525-2027
R&D Projects: GA AV ČR IAA300120709; GA ČR GAP210/12/2381
Institutional support: RVO:67985530
Keywords : body-wave anisotropy * Northern Apennines * upper mantle
Subject RIV: DC - Siesmology, Volcanology, Earth Structure
Impact factor: 3.054, year: 2013

We image anisotropic structure of the upper mantle beneath the Northern Apennines based on body-wave data collected during the RETREAT experiment (2003-2006). Joint analysis of anisotropic parameters evaluated from independent data setsteleseismic P-wave travel times and shear-wave splittingallows us to identify regions of different fabrics both in the mantle lithosphere and in the sublithospheric mantle. We recognize three regionsthe Tyrrhenian, Adriatic, and Transitionwith their own anisotropic characteristics. The slab-parallel flow prevails in the sublithospheric mantle beneath the thin Tyrrhenian plate, while nearly slab-perpendicular orientation of the high velocities dominates on the Adriatic side of the region. The asthenospheric-flow pattern excludes a simple corner-flow model to fit the fabric of the upper mantle in the syn-convergent extensional tectonics and suggests the end of the subduction roll-back. We map fossil anisotropy with inclined symmetry axes within two domains of the thick continental Adriatic lithosphere.
Permanent Link: http://hdl.handle.net/11104/0222948