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

J. Plomerová, L. Margheriti, J. Park, V. Babuška, S. Pondrelli, L. Vecsey, D. Piccinini, V. Levin, P. Baccheschi, S. Salimbeni

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Abstract

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.

Original languageEnglish (US)
Pages (from-to)157-170
Number of pages14
JournalEarth and Planetary Science Letters
Volume247
Issue number1-2
DOIs
Publication statusPublished - Jul 15 2006

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All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Keywords

  • Northern Apennines
  • SKS birefringence
  • continental dynamics
  • seismic anisotropy

Cite this

Plomerová, J., Margheriti, L., Park, J., Babuška, V., Pondrelli, S., Vecsey, L., ... Salimbeni, S. (2006). Seismic anisotropy beneath the Northern Apennines (Italy): Mantle flow or lithosphere fabric? Earth and Planetary Science Letters, 247(1-2), 157-170. https://doi.org/10.1016/j.epsl.2006.04.023