Structural model of the subcrustal lithosphere in central Europe

Babuška, Vladislav; Plomerová, J.; Šı́lený, Jan

doi:10.1029/gd016p0239

Cited by 68 publications

(51 citation statements)

References 25 publications

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“…Several geophysical studies suggest that the lithosphere under the basin is thinner than 80 km (e.g. Babuska et al 1987;Posgay et al 1995). The several types of deformation having taken place in the Pannonian basin are partly hidden by a thick sequence of sedimentary rocks of NeogeneQuaternary age.…”

Section: T E C T O N I C S E T T I N G O F T H E Pa N N O N I a N B Amentioning

confidence: 99%

Probabilistic waveform inversion for 22 earthquake moment tensors in Hungary: new constraints on the tectonic stress pattern inside the Pannonian basin

Wéber¹

2015

Geophysical Journal International

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S U M M A R YWe have successfully estimated the full moment tensors of 22 local earthquakes with local magnitude ranging from 1.2 to 4.8 that occurred in the Hungarian part of the Pannonian basin between 1995 and 2014. We used a probabilistic waveform inversion procedure that takes into account the effects of the random noise contained in the seismograms, the uncertainty of the hypocentre determined from arrival times and the inaccurate knowledge of the velocity structure, while estimating the error affecting the derived focal parameters. The applied probabilistic approach maps the posterior probability density functions (PPDFs) for both the hypocentral coordinates and the moment tensor components. The final estimates are given by the maximum likelihood points of the PPDFs, while solution uncertainties are presented by histogram plots. The estimated uncertainties in the moment tensor components are plotted on the focal sphere in such a way, that the significance of the double couple (DC), the compensated linear vector dipole (CLVD) and the isotropic (ISO) parts of the source can be assessed. We have shown that the applied waveform inversion method is equally suitable to recover the source mechanism for low-magnitude events using short-period local waveforms as well as for moderate-size earthquakes using long-period seismograms. The non-DC components of the retrieved focal mechanisms are statistically insignificant for all the analysed earthquakes. The negligible amount of the ISO component implies the tectonic nature of the investigated events. The moment tensor solutions reported by other agencies for five of the M L > 4 earthquakes studied in this paper are very similar to those calculated by the applied waveform inversion algorithm. We have found only strike-slip and thrust faulting events, giving further support to the hypothesis that the Pannonian basin is currently experiencing a compressional regime of deformation. The orientations of the obtained focal mechanisms are in good agreement with the main stress pattern published for the Pannonian region. The azimuth of the subhorizontal P principal axis varies from about NNE-SSW in SW Hungary through NE-SW well inside the basin to around E-W in the NE part of the country. Most of the analysed earthquakes occurred on faults or subfaults differently oriented than the main fault system.

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Section: T E C T O N I C S E T T I N G O F T H E Pa N N O N I a N B Amentioning

confidence: 99%

Probabilistic waveform inversion for 22 earthquake moment tensors in Hungary: new constraints on the tectonic stress pattern inside the Pannonian basin

Wéber¹

2015

Geophysical Journal International

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“…Besides these two major plates, a number of smaller tectonic fragments were involved in the construction of the present-day Alpine architecture. Paleogeographic reconstructions describe the progressive consumption of the Meliata and then of the Piemont-Ligurian Ocean by Late Cretaceous; continental collision started in the Middle Eocene, involving several hundreds of kilometers of shortening causing the formation of thick lithospheric roots (e.g., PANZA et al 1980;BABUSKA et al 1987). The Eastern Alps (EA) were later affected by the roll back of the Carpathian subduction (ROYDEN et al 1983) in the Late Oligocene-Early Miocene, and reacted with the onset of an escape tectonic regime (RATSCHBACHER et al 1991) as indicated by dextral transpression in the south (Periadriatic line) and sinistral, strike-slip dominated kinematics in the north (e.g., SEMP line, Mur-Muerz-line).…”

Section: Introductionmentioning

confidence: 99%

A New Seismic Data Set on the Depth of the Moho in the Alps

Bianchi

Behm

Rumpfhuber

et al. 2014

Pure Appl. Geophys.

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We present the results from receiver function analysis applied to a comprehensive data set in the Eastern Alps. Teleseismic events were recorded at 70 stations with an average deployment of 1 year. The investigated area includes the eastern part of the Eastern Alps and their transition to the Bohemian Massif, the Pannonian domain, and the Southern Alps. The crustal structure at each station is examined with the Zhu-Kanamori (ZK) method, which yields well-resolved interface depths in laterally homogeneous media with limited layering. The application of the ZK technique is challenged because of the complex tectonic setting; therefore, we include additional constraints from recent active-source seismic studies. In particular, the well-known crustal P-wave velocity and, where available, the V p /V s ratio are kept fixed, thus reducing the ambiguity in determining Moho depths. Individual depth values vary strongly between adjacent stations, showing that the employment of the ZK technique in tectonically complex settings is limited. We therefore avoid interpreting the results in detail, but rather compare them to existing crustal models of the Eastern Alps. We regard this receiver function study in the easternmost part of the Alps as a documentation of a data set that has potential to be exploited in the future.

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“…For body waves the evidence of anisotropy results from the investigation of the splitting in teleseismic shear waves such as SKS (VINNIK et al, 1984(VINNIK et al, , 1989a(VINNIK et al, ,b, 1992SILVER and CHAN, 1988;ANSEL and NATAF, 1989), ScS (ANDO, 1984;FUKAO, 1984) and S (ANDO and ISHIKAWA, 1983;BOWMAN and ANDO, 1987;FISCHER and WIENS, 1996;GAHERTY and JORDAN, 1995). There is also evidence of P-wave anisotropy (BABUŠKA et al, 1984(BABUŠKA et al, , 1993. These waves are shown to provide an excellent lateral resolution.…”

Section: E6idence Of Anisotropy In the Upper 410 Km Of The Mantlementioning

confidence: 99%

“…In the lithosphere, it is usually explained by the preferred orientation of olivine (NICOLAS and CHRISTENSEN, 1987) and is related to plate tectonics processes. The intrinsic anisotropy of minerals (olivine and to a less extent orthopyroxene and clinopyroxene) associated with lattice-preferred orientation induces large-scale observable and unambiguous effects, either on body waves (S-wave splitting observed on SKS (VINNIK et al, 1984); P-wave anisotropy (BABUŠKA et al, 1984) or surface waves through the azimuthal anisotropy (FORSYTH, 1975) and the 'polarization' anisotropy (SCHLUE and KNOPOFF, 1977). Both kinds of observable anisotropy can be simultaneously explained by the theoretical developments of MONTAGNER and NATAF (1986).…”

Section: Introductionmentioning

confidence: 99%

Where Can Seismic Anisotropy Be Detected in the Earth’s Mantle? In Boundary Layers...

Montagner

1998

Pure appl. geophys.

132

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During the last 30 years, considerable evidence of seismic anisotropy has accumulated demonstrating that it is present at all scales, but not in all depth ranges. We detail which conditions are necessary to detect large-scale seismic anisotropy. Firstly, minerals must display a strong anisotropy at the microscopic scale, and/or the medium must be finely layered. Secondly, the relative orientations of symmetry axes in the different crystals must not counteract in destroying the intrinsic anisotropy of each mineral, and there must be efficient mechanisms of orientation of minerals and aggregates. Finally, the strain field must be coherent at large scale in order to preserve long wavelength anisotropy. Part of shallow anisotropy can be related to the past strain field (frozen-in anisotropy), however the deep anisotropy is due to the present strain field. All these conditions are fulfilled only in boundary layers of convective mantle.We review in this paper, the seismic data sets which provide insight into the location at depth of large-scale anisotropy from the D¦-layer up to the lithosphere. In addition to the well-documented seismic anisotropy in the lithosphere and asthenosphere, there is new evidence of seismic anisotropy in the upper (400-660 km) and lower (660 -900 km) transition zones and in the D¦-layer. Nonetheless the bulk of the lower mantle seems close to isotropy. If we assume the hypothesis that seismic anisotropy is associated with boundary layers in convective systems, these observations strongly suggest that the transition zone is a boundary layer which makes the pasage of matter between the upper and the lower mantle difficult. However, this general statement does not rule out flow circulation between the upper and lower mantles. Finally, the geophysical, mineral physics and geological applications are briefly reviewed. An intercomparison between surface wave anisotropy and body-wave anisotropy data sets is presented. We discuss the scientific potential of seismic anisotropy and how it makes it possible to gain more insight into continental root, deformation and geodynamics processes.

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Structural model of the subcrustal lithosphere in central Europe

Cited by 68 publications

References 25 publications

Probabilistic waveform inversion for 22 earthquake moment tensors in Hungary: new constraints on the tectonic stress pattern inside the Pannonian basin

Probabilistic waveform inversion for 22 earthquake moment tensors in Hungary: new constraints on the tectonic stress pattern inside the Pannonian basin

A New Seismic Data Set on the Depth of the Moho in the Alps

Where Can Seismic Anisotropy Be Detected in the Earth’s Mantle? In Boundary Layers...

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