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Badania struktury skorupy ziemskiej na obszarze Europy Centralnej, ze szczególnym uwzględnieniem Transeuropejskiej Strefy Szwu, metodami głębokich profilowań sejsmicznych

Guterch A.

Wiadomości Naftowe i Gazownicze

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2012

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R. 15, Nr 9 (173)

4--9

EN

The complex tectonic history of Central Europe (Fig. 1a) reflects the break-up of a Neoproterozoic supercontinet(s) (Rodinia/Pannotia) to form the fragment Baltica and the subsequent growth of continental Europe beginning with the Caledonian orogeny. Caledonian and younger Variscan orogenesis involved accretion of Laurentian and Gondwanan terranes to the riftet margin of Baltica. (East European craton, EEC) during the Paleozoic. From Central Poland northward, the region also experienced volcanic activity during the Permian and tectonic inversion during the Alpine orogeny, which in the south continues today. The Trans-European Suture Zone (TESZ) is a term used to refer to the suite of sutures and terranes that formed adjacent to the rifted margin of Baltica, and these features extend from the British Isles to the Black Sea region (Fig. 1a and 2). Understanding the structure and evolution of the TESZ region is one of the key tectonic challenges in Europe north of the Alps. The TESZ is far more complex than a single suture but in a broad sense is the boundary between the accreted terranes and Baltica. The TESZ includes the Teisseyre-Tornquist Zone (TTZ), which has several definitions. Here, we will use the term TTZ to refer to a structural zone associated with the southwestern edge of the EEC. Beginning in 1997, Central Europe, between the Baltic and Adriatic Seas, has been covered by an unprecedented network of seismic refraction experiments (Fig. 1b). These experiments - POLONAISE’97, CELEBRATION 2000, ALP 2002, and SUDETES 2003 - have only be possible due to a massive international cooperative effort. International Consortium consisted of 35 institutions from 16 countries in Europe and North America - Austria, Belarus, Canada, Croatia, Czech Republic, Denmark, Finland, Germany, Hungary, Lithuania, Poland, Russia, Slovakia, Slovenia, Turkey and the United States. The majority of the recording instruments was provided by the IRIS/ PASCAL Instrument Center and the University of Texas at El Paso (USA), the Geological Survey of Canada and other countries. For example, in the CELEBRATION experiment, the total number was 1230 stations ands 147 shot points located along seismic lines of a total length of about 9000 km. A large number of seismic sources and stations in all experiments means that besides 2 - D approach along profiles (Fig. 3 and 4), also 3 - D approach (Fig. 5 and 6) could be implemented in data interpretation. Total length of seismic profiles in all experiments is about 20 000 km (Fig. 1b).

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Struktura głębokiego podłoża Karpat w oparciu o kompleksową interpretację danych geofizycznych

Królikowski C., Młynarski S.

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

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2003

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T. 29, z. 3--4

197-218

PL

W pracy przedstawiono model budowy litosfery w polskich Karpatach. Jest on oparty na wynikach kompleksowej interpretacji wzdłuż profilów magnetotellurycznych (MT) i sejsmiki refrakcyjnej. W wyniku interpretacji sejsmicznych profili refrakcyjnych wyznaczono przebieg granicy sejsmicznej wiązanej z podłożem krystalicznym. Oś depresji karpackiej i linie nieciągłości grawimetrycznych wskazują na istnienie strefy oddzielającej segment zachodni od segmentu wschodniego polskich Karpat. Wyniki modelowań grawimetrycznych wzdłuż profilów MT wydają się potwierdzać różnice strukturalne w obydwu segmentach. Stwierdzono względnie płaski przebieg nieciągłości Moho w segmencie zachodnim i jej znaczne zagłębienie w segmencie wschodnim.

EN

In the paper a model of lithosphere structure in the Polish Carpathians is presented. It is based on results of an integrated interpretation along the magnetotelluric (MT) and seismic refraction profiles. As a result of the refraction data reinterpretation, a seismic horizon related to the top of the crystalline basement is described. An axis of the Carpathian gravity depression and main sequences of gravity discontinuities show the existing in the Polish Carpathians of an important zone separating the western part (segment) from the eastern one. Results of the gravity modeling along the MT profiles seem to prove the structure differences in both of the segments. A relatively flat Moho discontinuity in the western segment and its significant lowering in the eastern one were started as well.

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Sejsmiczna struktura litosfery i górnego płaszcza Ziemi kontynentów

Grad M.

Przegląd Geofizyczny

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2000

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Z. 1

43-61

EN

Seismic models of the continental lower lithosphere and upper mantle obtained from interpretation of body P waves are discussed. The models of the lower lithosphere differ in the character of veloc-ity distribution, the number of layers, and the presence of the lower-velocity layers. This is the con-sequence of inhomogeneity of the lower lithosphere, but also follows from the differing accuracy and quality of seismic data. The differences in models resulting from the use of seismological methods based on earthquake observations and experiments on long-range profiles are pointed out. In all continental mantle models, both the "410" km and "660" km discontinuities were clearly ob-served. The "520" km boundary is observed for some models (for some models only a gradient change is observed). So, the global existence of this boundary for P waves seems to be still contro-versial.