Publication Date:
2017-04-04
Description:
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.
Description:
Published
Description:
5391-5403
Description:
1T. Geodinamica e interno della Terra
Description:
JCR Journal
Description:
restricted
Keywords:
Local earthquake tomography
;
tectonic of Apennines
;
04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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