Publication Date:
2017-04-04
Description:
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.
Description:
Published
Description:
157-170
Description:
JCR Journal
Description:
reserved
Keywords:
birefringence;
;
Apennines
;
04. Solid Earth::04.01. Earth Interior::04.01.02. Geological and geophysical evidences of deep processes
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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