Publication Date:
2017-04-04
Description:
During the years 2003-2006 CAT/SCAN (Calbarian-Apennine-TyrrhenianlSubductionCollision-
Accretion Network) temporary broadband stations operate in Southern Apennine
and Calabria (Italy). In the same period CESIS-INGV project improved the number of
permanent seismic stations in the same area. We analyze the data recorded to study seismic
anisotropy and to investigate the mantle flow in the boun(fary-zoile{ between Southern
Apennine and Calabriaibeneath and above the subducting slab. In the current work we
present new shear wave splittings obtained analyzing SKS phases of 15 teleseisms with
epicentral distance ranging from 88.40 to 98.20 and magnitude greater than 6.0. We used the method of Silver & Chan (1991) to obtained anisotropic parameters: delay time and fast polarization direction. The splitting parameters reveal strong seismic anisotropy in the mantle beneath Southern Tyrrhenian Sea- Calabrian Arc System that seems to be controlled by the slab presence. The clear variability in the fast directions allow us to hypothesize the existence of different anisotropic domains: fast polarization directions vary from NNW -SSE
in the tyrrhenian side ofthe Southern Apennine to N-S and NE-SW toward the Adriatic Sea. Moving toward the Calabria fast directions are prevalently trench parallel showing a NE-SW orientation following the strike on the mountain chain.
Description:
Published
Description:
Chateau of Trest, Czech Republic
Description:
3.3. Geodinamica e struttura dell'interno della Terra
Description:
open
Keywords:
Seismic anisotropy
;
SKS shear wave splitting
;
southern Italy subduction system
;
04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy
;
04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
;
04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics
;
04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
Poster session
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