Group velocity tomography and regionalization in Italy and bordering areas

Pontevivo, A.; Panza, G. F.

doi:10.1016/s0031-9201(02)00079-1

Cited by 40 publications

(47 citation statements)

References 32 publications

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“…Surface waves dispersion curves, determined along different paths by the Frequency-Time Analysis (LEVSHIN et al, 1972(LEVSHIN et al, , 1992, and tomographic methods applied to these measurements are widely used to study lateral variations of the crust and of the upper mantle (e.g., YANOVSKAYA et al, 1988YANOVSKAYA et al, , 1998MARTINEZ et al, 1997MARTINEZ et al, , 2000MARTINEZ et al, , 2001RITZWOLLER and LEVSHIN, 1998;VUAN et al, 2000;PASYANOS et al, 2001;KARAGIANNI et al, 2002;PONTEVIVO and PANZA, 2002). To determine the thickness and the vertical velocity distribution of the lithospheric layers in the area under investigation in Fig.…”

Section: Datamentioning

confidence: 99%

“…To determine the thickness and the vertical velocity distribution of the lithospheric layers in the area under investigation in Fig. 1, we consider the data obtained from the surface-wave tomography regional study made by PONTEVIVO and PANZA (2002) and, where pertinent, the large-scale study by PASYANOS et al (2001). PONTEVIVO and PANZA (2002) use the two-dimensional tomography algorithm developed by DITMAR and YANOVSKAYA (1987) and YANOVSKAYA and DITMAR (1990) to obtain tomography maps of Rayleigh wave fundamental mode group (U) and phase (C) velocities in Italy and bordering areas, in the period range 10-35 s for U and 25-100 s for C. Their lateral resolving power is of about 200 km (cells of 2°· 2°).…”

Section: Datamentioning

confidence: 99%

“…Figure 1 (a) The considered cells in the study area: Different patterns indicate different phase (C) and group (U) velocity measurement errors associated with the cells, according to the path coverage by PONTEVIVO and PANZA (2002): (1) U measurement error equal to twice q Um (bad coverage) and C measurement error equal to q Cm (good coverage); (2) measurement errors equal to twice q Um and twice q Cm (bad coverage both in group and phase velocities); (3) measurement errors equal to q Um and twice q Cm (bad coverage in phase velocity); (4) measurement errors equal to q Um and q Cm (good coverage both in group and phase velocities). The black bold line represents the study section AB following the line of the palaeogeographic prolongation of the Ionian Sea towards the northwest proposed by CATALANO et al (2001).…”

Section: Introductionmentioning

confidence: 99%

“…Our surface-wave tomography and nonlinear inversion combined study, instead, does not require resorting to any background model. MARTINEZ et al (1997MARTINEZ et al ( , 2001 propose an objective regionalization of group velocity Rayleigh wave dispersion data for the Mediterranean area using the Backus-Gilbert formulation (BACKUS andGILBERT, 1968, 1970) and Yanovskaya methodology (YANOVSKAYA, 1984;DITMAR and YANOVSKAYA, 1987;YANOVSKAYA and DITMAR, 1990) for the computation of local group velocities from path-averaged dispersion curves for periods from 10 s to 70 s. They use the same approach as PONTEVIVO and PANZA (2002), whose tomography data are inverted in this study, but the latter consider both group and phase velocity dispersion curves spanning the period range 10-100 s and reaching the penetration depth of about 250 km.…”

Section: Introductionmentioning

confidence: 99%

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The Lithosphere-Asthenosphere System in the Calabrian Arc and Surrounding Seas – Southern Italy

Pontevivo

Panza

2006

Pure appl. geophys.

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A fairly detailed structural model of the lithosphere-asthenosphere system (thickness, S-and P-wave velocities of the crust and of the uppermost mantle layers) has been defined in the Calabrian Arc region (Southern Tyrrhenian Sea, Calabria and the northwestern part of the Ionian Sea) in Southern Italy using seismic data from literature as a priori constraints of the nonlinear inversion of surface-wave data.The main features identified by this study are: (1) A very shallow (less then 10 km deep) crust-mantle transition in the Southern Tyrrhenian Sea and a very low v s just below a very thin lid, in correspondence of the submarine volcanic bodies Magnaghi, Marsili and Vavilov, while the v s in the lid is quite high in the area that separates Marsili from Magnaghi-Vavilov; (2) a shallow and very low v s layer in the uppermost mantle in the areas of the Aeolian Islands, Vesuvius, Phlegraean Fields and Ischia, which represents their shallow-mantle magma source; (3) a thickened continental crust and lithospheric doubling in Calabria; (4) a crust about 25-km thick and a mantle velocity profile versus depth consistent with the presence of a continental rifted lithosphere, now thermally relaxed, in the investigated part of the Ionian Sea; (5) the subduction towards northwest of the Ionian lithosphere below the Southern Tyrrhenian Sea; (6) the subduction of the Adriatic/Ionian lithosphere underneath the Vesuvius and Phlegraean Fields.

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Section: Datamentioning

confidence: 99%

Section: Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Lithosphere-Asthenosphere System in the Calabrian Arc and Surrounding Seas – Southern Italy

Pontevivo

Panza

2006

Pure appl. geophys.

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“…In addition, the main differences between shear velocity models obtained with and without assuming causal effects are illustrated by means of additional computations. The same working scheme has been applied to obtain an objective regionalisation based on Rayleigh wave group velocities of the Mediterranean basin (MARTINEZ et al, 2001) and another similar for Italy and bordering areas (PONTEVIVO and PANZA, 2002). In this last case, other classification and inversion methods have been used.…”

Section: Introductionmentioning

confidence: 99%

Elastic-anelastic Regional Structures for the Iberian Peninsula Obtained from a Rayleigh Wave Tomography and a Causal Uncoupled Inversion

Martínez

Lana

Caselles

et al. 2005

Pure appl. geophys.

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The elastic and anelastic structure of the lithosphere and asthenosphere of the Iberian Peninsula is derived by means of tomographic techniques applied to local phase and group velocities and local attenuation coefficients of Rayleigh wave fundamental mode. The database consists of surface wavetrains recorded at the broadband stations located in the Iberian Peninsula on the occasion of the ILIHA project. Path-averaged phase and group velocities and attenuation coefficients were previously obtained by standard filtering techniques of surface wavetrains and, subsequently, local dispersion curves were computed according to the Yanovskaya-Ditmar formulation. First, a principal component analysis (PCA) and the average linkage (AL) clustering algorithm are applied to these local values in order to classify the Iberian Peninsula in several rather homogeneous domains from the viewpoint of the similarity of the corresponding local dispersion curves, without previous seismotectonic constraints. Second, averaged phase and group velocities and attenuation coefficients representing each homogeneous region are used to derive the respective elastic and anelastic models of the lithosphere and asthenosphere. This purpose is achieved by using the uncoupled causal inversion of phase and group velocities and attenuation coefficients. The main features of the homogeneous regions are discussed by taking as reference the Hercynic, Alpine and Neogene domains of the Iberian Peninsula, and two questions affecting the reliability of the elastic-anelastic models are revised. First, the coherence of the shear-velocity and Q À1 b models obtained by causal uncoupled inversion for each region is analysed. Second, the influence of the causal phase and group velocities on the shear-velocity models is evaluated by comparing elastic and anelastic models derived from causal uncoupled inversion with those deduced from non-causal inversion.

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Earth Sciences Contribution to the Sustainable Development of Ground Transportation Systems: Relevant Case Studies in Central Europe

Panza

Kouteva

2003

Risk Science and Sustainability Science for Reduction of Risk and Sustainable Development of Society

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Group velocity tomography and regionalization in Italy and bordering areas

Cited by 40 publications

References 32 publications

The Lithosphere-Asthenosphere System in the Calabrian Arc and Surrounding Seas – Southern Italy

The Lithosphere-Asthenosphere System in the Calabrian Arc and Surrounding Seas – Southern Italy

Elastic-anelastic Regional Structures for the Iberian Peninsula Obtained from a Rayleigh Wave Tomography and a Causal Uncoupled Inversion

Earth Sciences Contribution to the Sustainable Development of Ground Transportation Systems: Relevant Case Studies in Central Europe

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