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Deep structure and tectonics of the northern-central Apennines as seen by regional-scale tomography and 3-D located earthquakes
Author(s)
Language
English
Obiettivo Specifico
1T. Geodinamica e interno della Terra
Status
Published
JCR Journal
JCR Journal
Title of the book
Issue/vol(year)
10/118(2013)
ISSN
0148-0227
Publisher
American Geophysical Union
Pages (printed)
5391-5403
Issued date
October 2013
Alternative Location
Abstract
In this study we present new high-resolution, regional-scale, Vp and Vp/Vs models of
the northern-central Apennines along with accurate 3-D locations of a large set of local
earthquakes. The main velocity anomalies are consistent with the surface geology in the
shallow layers and present evidence for fluids stored within the basement at greater depths
beneath the extensional belt. The Adria and Tyrrhenian mantle are defined by positive velocity
anomalies below 30 km depth, while a low-Vp, high-Vp/Vs region in between indicates the
existence of a hydrated wedge. The results yield new constraints on active processes in the
Apennines and more generally envisage the evolution of a postcollisional belt. Velocity
anomalies and earthquakes are consistent with a complex system of delamination and sinking of
the Adria continental lithosphere, with the peeling of the crust identified by intermediate-depth
seismicity. Change of seismicity and structural patterns along the belt indicates that this
tectonic process is diachronous and that fluids, released by sunken lithosphere, are stored
within the crust, conditioning the occurrence of seismicity and the onset of extension.
the northern-central Apennines along with accurate 3-D locations of a large set of local
earthquakes. The main velocity anomalies are consistent with the surface geology in the
shallow layers and present evidence for fluids stored within the basement at greater depths
beneath the extensional belt. The Adria and Tyrrhenian mantle are defined by positive velocity
anomalies below 30 km depth, while a low-Vp, high-Vp/Vs region in between indicates the
existence of a hydrated wedge. The results yield new constraints on active processes in the
Apennines and more generally envisage the evolution of a postcollisional belt. Velocity
anomalies and earthquakes are consistent with a complex system of delamination and sinking of
the Adria continental lithosphere, with the peeling of the crust identified by intermediate-depth
seismicity. Change of seismicity and structural patterns along the belt indicates that this
tectonic process is diachronous and that fluids, released by sunken lithosphere, are stored
within the crust, conditioning the occurrence of seismicity and the onset of extension.
Type
article
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Carannante_et_at_2013_JGR.pdf
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