Velocity structure of the western Mediterranean from inversion of P-wave traveltimes

Gobarenko, V. S.; Николова, С.; Sokolova, S

doi:10.1111/j.1365-246x.1990.tb05570.x

Cited by 11 publications

(6 citation statements)

References 14 publications

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“…An intense local low in the geoid topography is known over the Po Basin (Rapp 1981). These structures are distinguished by high heat-flow values ( b -n a k 1982), while seismological evidence clearly indicates low-velocity zones in the upper mantle (Hovland, Gubbins & Husebye 1981;Babuska et al 1984;Gobarenko, Nikolova & Sokolova 1990). All these data point to the presence of asthenosphere beneath these structures at rather shallow levels.…”

Section: Interpretation Of Resultsmentioning

confidence: 93%

“…The crust of the Pannonian Basin is thin and invaded by mafic rocks. In the upper mantle, low-velocity inhomogeneities have been demonstrated by seismological data (Babuska et al 1984;Gobarenko et al 1990). The high heat flow values indicate partial melting of upper-mantle material (cermak 1982;Bur'yanov et al 1987).…”

Section: G E O D Y N a M I C Implications Of T H E R E S U L T Smentioning

confidence: 94%

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3-D density model for the lithosphere of Europe: construction method and preliminary results

Yegorova

Kozlenko

Павленкова

1995

Geophysical Journal International

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S U M M A R YA map of the observed gravity field of Europe has been constructed by averaging anomalies on a 1" X 1" grid in a combined reduction of Bouguer anomalies on land and free-air anomalies offshore. On the basis of the observed gravity field and recent seismic data on crustal structure, a 3-D density model for the lithosphere of Europe has been calculated. The model is represented by two complementary parts, each obtained by its own specific method. For the south of Eastern Europe, the 3-D density model of the Earth's crust comprising the sedimentary cover and three layers within the crystalline crust (upper, intermediate and lower crust) was obtained by the following procedure: (1) the velocity model was transformed into a density distribution using the velocity-density relation; (2) the gravity field of this density distribution was calculated by solving the 3-D direct gravity problem; (3) the residual gravity field was obtained by subtracting the total gravity effect of the model and the regional component from the oberved gravity field: (4) the isostatic equilibrium of the model was evaluated; (5) in accordance with the residual anomalies and isostasy estimates, some changes (mainly in density distribution within the sedimentary cover) were entered into the initial density model and the final version of the density model was obtained for the consolidated crust as well as for areas with density inhomogeneities within the upper mantle.The correlation between Moho traveltimes and crustal gravity influence obtained from the results of 3-D modelling for the south of Eastern Europe, supplemented by 2-D modelling data available over Western Europe, makes it possible to estimate (without solving the direct gravity problem) the crustal gravity field for the whole European continent. Residual anomalies due to subcrustal density inhomogeneities have been interpreted in the light of seismic tomography and heat-flow distribution.For both parts of the model geological and geodynamical interpretations of the results have been made. In particular, differences in the deep structure of the two major geoblocks of the continent-the West and East European Platforms-have been confirmed. Regions of relatively light upper mantle have been outlined beneath the east and north-west of the East European Platform, while a heavier upper mantle has been distinguished below the Alps, the Caucasus, and the Calabrian Arc, as well as under the South Caspian Depression.

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Section: Interpretation Of Resultsmentioning

confidence: 93%

Section: G E O D Y N a M I C Implications Of T H E R E S U L T Smentioning

confidence: 94%

3-D density model for the lithosphere of Europe: construction method and preliminary results

Yegorova

Kozlenko

Павленкова

1995

Geophysical Journal International

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“…Marquering and Snieder, 1996;Martinez et al, 1997Martinez et al, , 2000Martinez et al, , 2001Ritzwoller and Levshin, 1998;Yanovskaya et al, 1998Yanovskaya et al, , 2000Pasyanos et al, 2001;Karagianni et al, 2002;Pontevivo and Panza, 2002) and body waves tomography (e.g. Gobarenko, 1990;Spakman, 1990;Babuska and Plomerova, 1990;Alessandrini et al, 1995Alessandrini et al, , 1997Papazachos et al, 1995;Papazachos and Kiratzi, 1996;Cimini and De Gori, 1997;Parolai et al, 1997;Piromallo and Morelli, 1997;Bijwaard et al, 1998;Lucente et al, 1999). Based on the existing information derived both from refraction and reflection experiments, and body-wave and surface-wave tomography, a compilation of the compressional velocity (V p ), shear velocity (V s ), and density (ρ) distribution in space is due to Du et al (1998).…”

Section: Introductionmentioning

confidence: 99%

The lithosphere-asthenosphere: Italy and surroundings

Panza¹,

Pontevivo²,

Chimera³

et al. 2003

Episodes

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The velocity-depth distribution of the lithosphereasthenosphere in the Italian region and surroundings is imaged, with a lateral resolution of about 100 km, by surface wave velocity tomography and non-linear inversion. Maps of the Moho depth, of the thickness of the lithosphere and of the shear-wave velocities, down to depths of 200 km and more, are constructed. A mantle wedge, identified in the uppermost mantle along the Apennines and the Calabrian Arc, underlies the principal recent volcanoes, and partial melting can be relevant in this part of the uppermost mantle. In Calabria, a lithospheric doubling is seen, in connection with the subduction of the Ionian lithosphere. The asthenosphere is shallow in the Southern Tyrrhenian Sea. High velocity bodies, cutting the asthenosphere, outline the Adria-Ionian subduction in the Tyrrhenian Sea and the deep-reaching lithospheric root in the Western Alps. Less deep lithospheric roots are seen in the Central Apennines. The lithosphere-asthenosphere properties delineate a differentiation between the northern and the southern sectors of the Adriatic Sea, likely attesting the fragmentation of Adria.

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“…Ziegler 2006 Tomographic investigations of the European deep structure started in the early eighties and were based mostly on body waves (Romanowicz 1980;Hovland et al 1981;Granet & Tranpert 1989). In the nineties, more detailed images of P velocity anomalies have been obtained for some regions like the Hellenic arc (Spakman 1991), the Iberian Peninsula (Blanco & Spakman 1993), the western (Gobarenko et al 1990) and the entire Mediterranean . The results of these first studies are already in reasonably good agreement with the geodynamic concept of the lithosphere evolution in the Mediterranean region (de Jonge et al 1994).…”

mentioning

confidence: 99%

P- andS-velocity anomalies in the upper mantle beneath Europe from tomographic inversion of ISC data

Koulakov

Kaban

Tesauro

et al. 2009

Geophysical Journal International

184

286

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S U M M A R YWe present a new tomographic model for P-and S-velocity anomalies beneath Europe (30 • N-55 • N, 5 • W-40 • E), extending in depth up to 700 km and constrained by inversion of data from the International Seismological Center (ISC) catalogue. The algorithm uses the traveltimes from events located in the study area recorded by all available worldwide stations, as well as times from teleseismic events recorded by European stations. The events from the ISC catalogue have been relocated and combined into composite events. All the traveltimes were corrected for crustal structure using the reference model EuCRUST-07. The resulting velocity anomalies show similar large-scale patterns as observed in previous studies, but have a higher resolution, which allows detection of some features in more detail. For example, it is now possible to assess the depth extension of the small slow velocity body beneath the Eifel region and Eger graben. The P and the S model show a good consistency in the uppermost 200 km below most of the European area and in some parts even in the deeper layers (e.g. beneath the Apennines and the Hellenic arc). The new model provides clear images of some principal features, which were previously detected in a limited number of studies, while the comparison between P-and S-velocity anomalies provides novel constraints to address on their nature (e.g. the gap in the Adriatic plate subducted below the central-southern Apennines). In this paper, we pay special attention to testing the reliability of the results. The random noise effect is evaluated using a test with independent inversion of two data subsets (with odd/even events). The spatial resolution is estimated using different checkerboard tests. Furthermore, we present a synthetic model with realistic patterns, which reproduces after performing forward and inverse modelling the same shape and amplitudes of the anomalies as in the case of the real data inversion. In this case, the parameters of the model can be used to assess the amplitudes of P and S anomalies that is critical for evaluation of other petrophysical parameters (temperature, density, composition, etc.) in the upper mantle.

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Velocity structure of the western Mediterranean from inversion of P-wave traveltimes

Cited by 11 publications

References 14 publications

3-D density model for the lithosphere of Europe: construction method and preliminary results

3-D density model for the lithosphere of Europe: construction method and preliminary results

The lithosphere-asthenosphere: Italy and surroundings

P- andS-velocity anomalies in the upper mantle beneath Europe from tomographic inversion of ISC data

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