Publication Date:
2020-10-26
Description:
We present here a new high resolution regional P-wave velocity model for the lithosphere beneath the Italian region obtained by including information on the Moho topography, and integrating results from local earthquake tomography with 30 years of CSS data, applying the method of Waldhauser (1996). For the 3D moho map, we extended the crustal model, already available for the Alps by Lippitsch et al., 2003, to the Italian peninsula, Corsica, Sardinia, and Sicily. The tomographic model is obtained by inverting 166,000 Pg and Pn arrival times large part of which have been automatically picked and consistently weighted with an advanced automatic picking system (Aldersons, 2004). The resolution of the obtained velocity model is consistently higher and the grid spacing consistently smaller than in previous tomographic works targeting the same region. We are able to image the complex geometry of this part of the subduction-collision system between the Eurasian and African plates adding important
details to the overview derived by the teleseismic tomography. Our results clearly
show the plate boundary at Moho level from the Alps to the Southern Apennines and
the Calabrian Arc in a volume unresolved in previous studies. The use of global 1D
velocity models based on the flat Earth assumption is a pre-requisite to refine and interpret images and seismic responses of the earth obtained with geophysical studies
(P and S tomography, surface wave tomography etc). Our model is suitable as a good
starting point for a 3D velocity reference model of the crust and upper mantle beneath
the Mediterranean area to be extended to the Adriatic Sea and to the Ionian Sea, with
benefit for earthquakes location,teleseismic tomography, focal mechanisms and CMT
Description:
Published
Description:
Vienna
Description:
3.3. Geodinamica e struttura dell'interno della Terra
Description:
open
Keywords:
local earthquake tomography
;
velocity model
;
Italian Peninsula
;
04. Solid Earth::04.02. Exploration geophysics::04.02.06. Seismic methods
;
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::04.07.06. Subduction related processes
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
Poster session
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