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| Titel |
Traces of the crustal units and the upper-mantle structure in the southwestern part of the East European Craton |
| VerfasserIn |
I. Janutyte, E. Kozlovskaya, M. Majdanski, P. H. Voss, M. Budraitis, PASSEQ Working Group |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 5, no. 2 ; Nr. 5, no. 2 (2014-08-15), S.821-836 |
| Datensatznummer |
250115328
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| Publikation (Nr.) |
 copernicus.org/se-5-821-2014.pdf |
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| Zusammenfassung |
| The presented study is a part of the passive seismic experiment PASSEQ
2006–2008, which took place around the Trans-European Suture Zone (TESZ)
from May 2006 to June 2008. The data set of 4195 manually picked arrivals of
teleseismic P waves of 101 earthquakes (EQs) recorded in the seismic
stations deployed to the east of the TESZ was inverted using the non-linear
teleseismic tomography algorithm TELINV. Two 3-D crustal models were used to
estimate the crustal travel time (TT) corrections. As a result, we obtain a
model of P-wave velocity variations in the upper mantle beneath the TESZ
and the East European Craton (EEC). In the study area beneath the craton, we
observe up to 3% higher and beneath the TESZ about 2–3% lower
seismic velocities compared to the IASP91 velocity model. We find the seismic
lithosphere–asthenosphere boundary (LAB) beneath the TESZ at a depth of
about 180 km, while we observe no seismic LAB beneath the EEC. The inversion
results obtained with the real and the synthetic data sets indicate a ramp
shape of the LAB in the northern TESZ, where we observe values of seismic
velocities close to those of the craton down to about 150 km. The
lithosphere thickness in the EEC increases going from the TESZ to the NE from
about 180 km beneath Poland to 300 km or more beneath Lithuania. Moreover,
in western Lithuania we find an indication of an upper-mantle dome. In our
results, the crustal units are not well resolved. There are no clear
indications of the features in the upper mantle which could be related to the
crustal units in the study area. On the other hand, at a depth of
120–150 km we indicate a trace of a boundary of proposed palaeosubduction
zone between the East Lithuanian Domain (EL) and the West Lithuanian
Granulite Domain (WLG). Also, in our results, we may have identified two
anorogenic granitoid plutons. |
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