Wyniki wyszukiwania - BazTech

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Nowa jakość sejsmicznego obrazu strukturalnego jako wynik obrazowania głębokościowego : studium przypadku z Ameryki Południowej

Tlałka S., Dybalak R., Bieta B.

Prace Naukowe Instytutu Nafty i Gazu

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2016

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nr 209 wyd. konferencyjne

519--524

PL

Zastosowanie migracji głębokościowej, wykorzystującej metody wychodzące poza proste iteracje budowy modelu, pozwala uzyskać model ośrodka umożliwiający zobrazowanie skomplikowanej budowy geologicznej. Technika, sprawdzona już w tektonice nasunięć, polega na rozszerzeniu sekwencji przetwarzania w domenie głębokości, rozbudowanym schematem z wieloma węzłami decyzyjnymi. Metoda prezentowana jest na przykładzie danych rzeczywistych ze strefy przejściowej Ameryki Południowej. Obrazowanie głębokościowe z budową modelu prezentowaną techniką, pozwoliło rozwiązać postawione zadanie geologiczne i uzyskać zdecydowaną poprawę strukturalną w stosunku do obrazowania w domenie czasu.

EN

The application of the pre-stack depth migration with methods which go beyond the simple iterations of the model building, allows to obtain an interval velocity models in areas where complex geological structures exist. The technique, already proven in the Thrust tectonics, consist in extending the seismic data processing sequence in depth domain, an expanded scheme of the multi-node decision-making. The method is presented on the example of the real data from the transition zone of South America. The depth imaging with the presented an advanced technique of the model building has allowed to solve the task and to get the vast improvement of structural image in relation to the imaging in time domain.

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Comparison of site effect values obtained by HVSR and HVSRN methods for single-station measurements in Tarnówek, South-Western Poland

Mendecki M. J., Bieta B., Mateuszów M., Suszka P.

Contemporary Trends in Geoscience

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2016

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Vol. 5, iss. 1

18--27

EN

This study compares the HVSR technique (Horizontal to Vertical Spectral Ratio), based on seismic event records, and the HVSRN technique (Horizontal to Vertical Spectral Ratio of Noise) using seismic noise registrations. Both methods allow us to study the amplification phenomenon of a horizontal component of seismic waves when the waves reach loose sediments in subsurface layers. The seismic data were measured at a three-component single seismic station located in the village of Tarnówek, in the Legnica-Głogów Copper District. The results of the study demonstrate that average HVSRN and HVSR maxima can be distinguished: for periods approximately 3.78 s (H/V = 6.2) and 3.969 s (H/V = 8.98) respectively. The evaluated share of the Rayleigh wave component in the recorded values was β = 0.58 and it can be suggested that the Love wave share in surface motion was insignificant. The Love wave share remains unknown.

3

Determination of the resonance frequency - thickness relation based on the ambient seismic noise records from Upper Silesia Coal Basin

Mendecki M. J., Bieta B., Mycka M.

Contemporary Trends in Geoscience

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2014

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Vol. 3, iss. 1

41--51

EN

In this paper the Horizontal-to-Vertical Spectral Ratio (HVSR) method and seismic data were applied to evaluate the resonance frequency – thickness relation. The HVSR method was used to estimate the parameters of site effects: amplification and resonance frequency from seismic noise records. The seismic noise was generated by artificial source occurring in Upper Silesia Coal Basin (UBSC), Poland, such as: traffic, industry, coal plants etc. The survey points were located near the Faculty of Earth Sciences in Sosnowiec, Bytom and Chorzow. Based on Albarello’s statistical test the observed H/V maxima was confirmed or rejected. Resonance frequencies were compared with available thicknesses of soft layer obtained by seismic survey (Mendecki 2012). Finally, the estimated resonance frequency – thickness relation for UBSC area showed quite similar power function coefficients as those obtained by other authors.