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

Peter, Daniel; Boschi, Lapo; Deschamps, Frédéric; Fry, Bill; Ekström, Göran; Giardini, Domenico

doi:10.1029/2008gl034769

“…Complicated patterns of heterogeneity are also found, in this area, by Piromallo and Morelli (2003), Schmid et al (2008) and Peter et al (2008).…”

Section: European Tomographymentioning

confidence: 83%

“…The v SV model of Peter et al (2008), derived from the same Rayleigh-wave data as ours, nevertheless differs significantly from LRSP30EU2. To a closer look, it appears that the total amount of slow and fast anomalies approximately coincides, at each geographic location, with that of LRSP30EU2; but their vertical distribution is quite different.…”

Section: European Tomographymentioning

confidence: 85%

“…To a closer look, it appears that the total amount of slow and fast anomalies approximately coincides, at each geographic location, with that of LRSP30EU2; but their vertical distribution is quite different. Peter et al (2008) first derived a set of Rayleigh-wave phase-velocity maps (hence, many sets of Rayleigh-wave dispersion curves) by direct inversion, similar to those of Figs. 17,18,19 and 20 (bottom panels).…”

Section: European Tomographymentioning

confidence: 99%

“…Peter et al (2008) compared ray-theoretical and finite-frequency tomographies based on the Rayleigh-wave component of our database. As anticipated by Fry et al (2008), the two approaches provide quite similar results at most frequencies; only the 150 s phase-velocity maps derived from ray-versus finite-frequency theory differ significantly.…”

Section: The Ray-theory Limitmentioning

confidence: 99%

See 2 more Smart Citations

The European Upper Mantle as Seen by Surface Waves

Boschi¹,

Fry²,

Ekström³

et al. 2009

Arrays and Array Methods in Global Seismology

View full text Add to dashboard Cite

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.

show abstract

“…The model of Boschi et al (2004) is generally slow under the Alps, where we, as well as Peter et al (2008), find a relatively strong fast anomaly at depths [250 km. A similar feature, albeit somewhat displaced and extending to a wider depth range, is visible in the models of both Piromallo and Morelli (2003) and Schmid et al (2008).…”

Section: European Tomographymentioning

confidence: 99%

The European Upper Mantle as Seen by Surface Waves

Boschi

¹

,

Fry

²

,

Ekström

³

et al. 2009

View full text Add to dashboard Cite

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.

show abstract

Finite‐frequency Rayleigh wave tomography of the western Mediterranean: Mapping its lithospheric structure

Palomeras

¹

,

Thurner

²

,

Levander

³

et al. 2014

Geochem Geophys Geosyst

View full text Add to dashboard Cite

[1] We present a 3-D shear wave velocity model for the crust and upper mantle of the western Mediterranean from Rayleigh wave tomography. We analyzed the fundamental mode in the 20-167 s period band (6.0-50.0 mHz) from earthquakes recorded by a number of temporary and permanent seismograph arrays. Using the two-plane wave method, we obtained phase velocity dispersion curves that were inverted for an isotropic Vs model that extends from the southern Iberian Massif, across the Gibraltar Arc and the Atlas mountains to the Saharan Craton. The area of the western Mediterranean that we have studied has been the site of complex subduction, slab rollback, and simultaneous compression and extension during African-European convergence since the Oligocene. The shear velocity model shows high velocities beneath the Rif from 65 km depth and beneath the Granada Basin from 70 km depth that extend beneath the Alboran Domain to more than 250 km depth, which we interpret as a near-vertical slab dangling from beneath the western Alboran Sea. The slab appears to be attached to the crust beneath the Rif and possibly beneath the Granada Basin and Sierra Nevada where low shear velocities (3.8 km/s) are mapped to >55 km depth. The attached slab is pulling down the Gibraltar Arc crust, thickening it, and removing the continental margin lithospheric mantle beneath both Iberia and Morocco as it descends into the deeper mantle. Thin lithosphere is indicated by very low upper mantle velocities beneath the Alboran Sea, above and east of the dangling slab and beneath the Cenozoic volcanics.

show abstract

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

Cited by 20 publications

References 23 publications

The European Upper Mantle as Seen by Surface Waves

The European Upper Mantle as Seen by Surface Waves

The European Upper Mantle as Seen by Surface Waves

Finite‐frequency Rayleigh wave tomography of the western Mediterranean: Mapping its lithospheric structure

Contact Info

Product

Resources

About