Publication Date:
2017-04-04
Description:
We propose a 3-D crust–upper mantle seismic attenuation (QP) model of the southern
Apennines–Calabrian Arc subduction zone together with a 3-D velocity (VP) model. The
QP model is calculated from relative t* using the spectral ratio method and the VP
from traveltime data. The final data set used for the inversion of the VP model consists of
2400 traveltime arrivals recorded by 34 short-period stations that are part of the Italian
National Seismic Network, and for the QP model, 2178 Pn phases recorded by a subset of
32 stations. Traveltimes and waveforms come from 272 intermediate-depth Calabrian
slab events. This 3-D model of attenuation, together with the 3-D velocity model,
improves our knowledge of the slab/mantle wedge structure and can be a starting point in
determining the physical state of the asthenosphere (i.e., its temperature, the presence
of melt and/or fluids) and its relation to volcanism found in the study area. Main features
of the QP and VP models show that the mantle wedge/slab, in particular, the area of
highest attenuation, is located in a volume underlying the Marsili Basin. The existence and
shape of this main low-QP (and low-VP) anomaly points to slab dehydration and
fluid/material flow, a process that may explain the strong geochemical affinities between
the subduction-related magmas from Stromboli and Vesuvius. Other interesting features
in the models are strong lateral variations in QP and VP that are put in relation with known
important tectonic structures and volcanic centers in the area.
Description:
Published
Description:
B06304
Description:
3.3. Geodinamica e struttura dell'interno della Terra
Description:
JCR Journal
Description:
reserved
Keywords:
seismic attenuation tomography
;
Calabrian Arc subduction zone
;
fluids and melts
;
04. Solid Earth::04.01. Earth Interior::04.01.01. Composition and state
;
04. Solid Earth::04.01. Earth Interior::04.01.02. Geological and geophysical evidences of deep processes
;
04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
Permalink
