Multiple resolution surface wave tomography: the Mediterranean basin

Boschi, Lapo; Ekström, Göran; Kustowski, Bogdan

doi:10.1111/j.1365-246x.2004.02194.x

Cited by 56 publications

(98 citation statements)

References 34 publications

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“…Including shorter surface-wave periods from noise correlations could allow us to extend our model search and invert simultaneously for crustal layer parameters [Panza et al, 2007]. In both V smodels (Figure 3) we find the same prominent features as Boschi et al [2004] and Marone et al [2004]. Although our models show a strong, high-velocity anomaly under the Hellenic Arc at 60 -150 km depths, related to the DinaridesHellenides subduction, the dip angle is only poorly resolved.…”

Section: Discussionmentioning

confidence: 64%

“…Yet, error estimates from Ekström et al [1997] are conservative, and there are suggestive hints that the finite-frequency method is indeed enhancing resolution. With respect to the ray-theory solution, the finite-frequency one is more coherent with V p structure found in a tectonic reconstruction of the temperature field [de Jonge et al, 1994]: compare, e.g., Figure 3 (layer at 220-310 km) with Figure 6 of Boschi et al [2004]. In the same depth range, a fast anomaly under the Central Alps, associated with past subduction, also found by Schmid et al [2008], is reproduced more clearly in our finite-frequency model than in the ray-theoretical one: compare, in particular, our TunisiaCentral Europe cross-section of Figure 4 with Figure 8 of Boschi et al [2004].…”

Section: Discussionmentioning

confidence: 99%

“…Figure 3. The Tunisia-Central Europe cross-section also shows contour lines from the model of Boschi et al [2004].…”

Section: Discussionmentioning

confidence: 99%

“…The dataset combines global and regional observations, which helps to further constrain regional seismic models [see, e.g., Shapiro and Ritzwoller, 2002]. Tectonics in Europe and in the Mediterranean region are governed by a complex interaction of the African, Eurasian and Arabian plates, comprehensively investigated in several tomographic studies [Spakman et al, 1993;Wortel and Spakman, 2001;Piromallo and Morelli, 2003;Boschi et al, 2004;Marone et al, 2004;Fry, 2007;Schmid et al, 2008]. Recent phase-velocity models of the region, found using analytical finite-frequency sensitivity kernels, show some significant discrepancies with ray-theoretical ones, especially between the Southern Apennines and the Hellenic Arc [Fry et al, 2008].…”

Section: Introductionmentioning

confidence: 99%

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A new finite‐frequency shear‐velocity model of the European‐Mediterranean region

Peter

Boschi

Deschamps

et al. 2008

Geophysical Research Letters

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[1] We invert a global phase-anomaly database of intermediate-to long-period Rayleigh waves, recently updated with increased coverage in the EuropeanMediterranean region, on a global scale with a higher resolution parameterization in the region of interest. We first compare phase-velocity inversions based on ray and finitefrequency theory and derive for each a corresponding set of local phase-velocity dispersion curves (one per model pixel) between 35 s to 300 s period. Effects of the two different theories on the three-dimensional upper-mantle structure are investigated by inverting each dispersion curve for radial shear-velocity profiles. The combination of a gradientdescent method and a random-Monte-Carlo model search provides an estimated shear-velocity model with associated uncertainties for depths between 40 km to 400 km. While differences between ray-theoretical and finite-frequency models are small compared to model uncertainty, comparisons with independent models favor the finitefrequency one.

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Section: Discussionmentioning

confidence: 64%

Section: Discussionmentioning

confidence: 99%

“…Figure 3. The Tunisia-Central Europe cross-section also shows contour lines from the model of Boschi et al [2004].…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A new finite‐frequency shear‐velocity model of the European‐Mediterranean region

Peter

Boschi

Deschamps

et al. 2008

Geophysical Research Letters

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“…We combine the new database with the one originally available to Boschi et al (2004), including *25,000 to *30,000 Love-, and *50,000 to *65,000 Rayleigh-wave fundamental-mode phase-anomaly measurements between 35 and 150 s periods, and a smaller number of analogous, global measurements at longer periods (between *2000 for Love waves at 300 s, and *9000 for Rayleigh waves at 200 s). In an attempt to maximize the resolving power of the data, and in view of the larger available computer RAM and storage Fig.…”

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confidence: 99%

The European Upper Mantle as Seen by Surface Waves

Boschi¹,

Fry²,

Ekström³

et al. 2009

Arrays and Array Methods in Global Seismology

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We derive a global, three-dimensional tomographic model of horizontally and vertically polarized shear velocities in the upper mantle. The model is based on a recently updated global database of Love-and Rayleigh-wave fundamental-mode phase-anomaly observations, with a good global coverage and a particularly dense coverage over Europe and the Mediterranean basin (broadband stations from the Swiss and German seismic networks). The model parameterization is accordingly finer within this region than over the rest of the globe. The large-scale, global structure of our model is very well correlated with that of earlier shear-velocity tomography models, based both on body-and surface-wave observations. At the regional scale, within the region of interest, correlation is complicated by the different resolution limits associated to different databases (surface waves, compressional waves, shear waves), and, accordingly, to different models; while a certain agreement appears to exist for what concerns the grand tectonic features in the area, heterogeneities of smaller scale are less robustly determined. Our new model is only one step towards the identification of a consensus model of European/Mediterranean uppermantle structure: on the basis of the findings discussed here, we expect that important improvements will soon result from the combination, in new tomographic inversions, of fundamental-mode phase-anomaly data like ours with observations of surface-wave overtones, of body-wave travel times, of ambient ''noise'', and by accounting for an a-priori model of crustal structure more highly resolved than the one employed here.

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Savani: A variable resolution whole‐mantle model of anisotropic shear velocity variations based on multiple data sets

et al. 2014

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We present a tomographic model of radially anisotropic shear velocity variations in the Earth's mantle based on a new compilation of previously published data sets and a variable block parameterization, adapted to local raypath density. We employ ray-theoretical sensitivity functions to relate surface wave and body wave data with radially anisotropic velocity perturbations. Our database includes surface wave phase delays from fundamental modes up to the sixth overtone, measured at periods between 25 and 350 s, as well as cross-correlation traveltimes of major body wave phases. Before inversion, we apply crustal corrections using the crustal model CRUST2.0, and we account for azimuthal anisotropy in the upper mantle using ray-theoretical corrections based on a global model of azimuthal anisotropy. While being well correlated with earlier models at long spatial wavelength, our preferred solution, savani, additionally delineates a number of previously unidentified structures due to its improved resolution in areas of dense coverage. This is because the density of the inverse grid ranges between 1.25• in well-sampled and 5• in poorly sampled regions, allowing us to resolve regional structure better than it is typically the case in global S wave tomography. Our model highlights (i) a distinct ocean-continent anisotropic signature in the uppermost mantle, (ii) an oceanic peak in above average <1 which is shallower than in previous models and thus in better agreement with estimates of lithosphere thickness, and (iii) a long-wavelength pattern of <1 associated with the large low-shear velocity provinces in the lowermost mantle.

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Multiple resolution surface wave tomography: the Mediterranean basin

Cited by 56 publications

References 34 publications

A new finite‐frequency shear‐velocity model of the European‐Mediterranean region

A new finite‐frequency shear‐velocity model of the European‐Mediterranean region

The European Upper Mantle as Seen by Surface Waves

Savani: A variable resolution whole‐mantle model of anisotropic shear velocity variations based on multiple data sets

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