Seismic anisotropy beneath the Northern Apennines (Italy): Mantle flow or lithosphere fabric?

Shear-wave splitting estimates from recordings of 10 portable seismographic stations during the first year of the RETREAT seismic deployment, in combination with broadband data from the Italian national seismic network, are associated with seismic anisotropy within the upper mantle beneath the North...

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Bibliographic Details
Published in:Earth and Planetary Science Letters
Main Authors: Plomerová, J., Margheriti, L., Park, J., Babuška, V., Pondrelli, S., Vecsey, L., Piccinini, D., Levin, L., Baccheschi, P., Salimbeni, S.
Other Authors: Plomerová, J.; Geophysical Institute, Czech Acad. of Sci., Boční II, 141 31 Prague 4, Czech Republic, Margheriti, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia, Park, J.; Yale University, Department of Geology and Geophysics, New Haven, USA, Babuška, V.; Geophysical Institute, Czech Acad. of Sci., Boční II, 141 31 Prague 4, Czech Republic, Pondrelli, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia, Vecsey, L.; Rutgers University, Department of Geological Sciences, NJ, USA, Piccinini, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia, Levin, L.; Rutgers University, Department of Geological Sciences, NJ, USA, Baccheschi, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia, Salimbeni, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia, Geophysical Institute, Czech Acad. of Sci., Boční II, 141 31 Prague 4, Czech Republic, Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione ONT, Roma, Italia, Yale University, Department of Geology and Geophysics, New Haven, USA, Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia, Rutgers University, Department of Geological Sciences, NJ, USA, Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2006
Subjects:
birefringence
Apennines
04. Solid Earth::04.01. Earth Interior::04.01.02. Geological and geophysical evidences of deep processes
Arctic
Online Access:http://hdl.handle.net/2122/2556
https://doi.org/10.1016/j.epsl.2006.04.023
Description
Summary:Shear-wave splitting estimates from recordings of 10 portable seismographic stations during the first year of the RETREAT seismic deployment, in combination with broadband data from the Italian national seismic network, are associated with seismic anisotropy within the upper mantle beneath the Northern Apennines. Anisotropic parameters derived from both shear-wave splitting and P travel-time residuals vary geographically and depend on event back-azimuth, reflecting complexity in the underlying mantle strain field. Variations of the splitting time delays and fast polarization seem to exclude a 2-D sublithosphere corner flow, associated with the Apennines subduction, as the main source of the inferred anisotropy. The anisotropic signal may be generated by a frozen-in fabric of the Adriatic and Tyrrhenian lithosphere domains, or by flow variations induced by episodic and fragmentary slab rollback. Published 157-170 JCR Journal reserved

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