4 results on '"Gazdova, R."'
Search Results
2. PASSEQ 2006–2008: Passive seismic experiment in Trans-European Suture Zone
- Author
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Wilde-Piórko, M., Geissler, W. H., Plomerová, J., Grad, M., Babuška, V., Brückl, E., Cyziene, J., Czuba, W., England, R., Gaczyński, E., Gazdova, R., Gregersen, S., Guterch, A., Hanka, W., Hegedűs, E., Heuer, B., Jedlička, P., Lazauskiene, J., Keller, G. Randy, Kind, R., Klinge, K., Kolinsky, P., Komminaho, K., Kozlovskaya, E., Krüger, F., Larsen, T., Majdański, M., Málek, J., Motuza, G., Novotný, O., Pietrasiak, R., Plenefisch, Th., Růžek, B., Sliaupa, S., Środa, P., Świeczak, M., Tiira, T., Voss, P., and Wiejacz, P.
- Published
- 2008
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3. Phase velocities of Rayleigh and Love waves in central and northern Europe from automated, broad-band, interstation measurements
- Author
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Soomro, R. A., Weidle, C., Cristiano, L., Lebedev, S., Meier, T., Wilde-Piórko, M., Geissler, Wolfram, Plomerová, J., Grad, M., Babuška, V., Brückl, E., C̆yz̆ienė, J., Czuba, W., England, R., Gaczyński, E., Gazdova, R., Gregersen, S., Guterch, A., Hanka, W., Hegedüs, E., Heuer, B., Jedlic̆ka, P., Lazauskiene, J., Keller, G. R., Kind, R., Klinge, K., Kolinsky, P., Komminaho, K., Kozlovskaya, E., Krüger, F., Larsen, T., Majdański, M., Málek, J., Motuza, G., Novotný, O., Pietrasiak, R., Plenefisch, T., Ruz̆ek, B., Sliaupa, S., Środa, P., Świeczak, M., Tiira, T., Voss, P., Wiejacz, P., Soomro, R. A., Weidle, C., Cristiano, L., Lebedev, S., Meier, T., Wilde-Piórko, M., Geissler, Wolfram, Plomerová, J., Grad, M., Babuška, V., Brückl, E., C̆yz̆ienė, J., Czuba, W., England, R., Gaczyński, E., Gazdova, R., Gregersen, S., Guterch, A., Hanka, W., Hegedüs, E., Heuer, B., Jedlic̆ka, P., Lazauskiene, J., Keller, G. R., Kind, R., Klinge, K., Kolinsky, P., Komminaho, K., Kozlovskaya, E., Krüger, F., Larsen, T., Majdański, M., Málek, J., Motuza, G., Novotný, O., Pietrasiak, R., Plenefisch, T., Ruz̆ek, B., Sliaupa, S., Środa, P., Świeczak, M., Tiira, T., Voss, P., and Wiejacz, P.
- Abstract
The increasingly dense coverage of Europe with broad-band seismic stations makes it possible to image its lithospheric structure in great detail, provided that structural information can be extracted effectively from the very large volumes of data. We develop an automated technique for the measurement of interstation phase velocities of (earthquake-excited) fundamental-mode surface waves in very broad period ranges. We then apply the technique to all available broad-band data from permanent and temporary networks across Europe. In a new implementation of the classical two-station method, Rayleigh and Love dispersion curves are determined by cross-correlation of seismograms from a pair of stations. An elaborate filtering and windowing scheme is employed to enhance the target signal and makes possible a significantly broader frequency band of the measurements, compared to previous implementations of the method. The selection of acceptable phase-velocity measurements for each event is performed in the frequency domain, based on a number of fine-tuned quality criteria including a smoothness requirement. Between 5 and 3000 single-event dispersion measurements are averaged per interstation path in order to obtain robust, broad-band dispersion curves with error estimates. In total, around 63,000 Rayleigh- and 27,500 Love-wave dispersion curves between 10 and 350 s have been determined, with standard deviations lower than 2 per cent and standard errors lower than 0.5 per cent. Comparisons of phase-velocity measurements using events at opposite backazimuths and the examination of the variance of the phase-velocity curves are parts of the quality control. With the automated procedure, large data sets can be consistently and repeatedly measured using varying selection parameters. Comparison of average interstation dispersion curves obtained with different degrees of smoothness shows that rough perturbations do not systematically bias the average dispersion measurement. They ca
- Published
- 2016
4. Moho depth across the Trans-European Suture Zone from P- and S-receiver functions
- Author
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Knapmeyer-Endrun, Brigitte, Kruger, Frank, Wilde-Piorko, M., Geissler, H., Plomerova, J., Grad, M., Babuska, J., Bruckl, E., Cyziene, J., Czuba, W., England, R., Gaczynski, E., Gazdova, R., Gregersen, S., Guterch, A., Hanka, W., Hegedus, E., Heuer, B., Jedlicka, B., Lazauskiene, J., Keller, G.R., Kind, R., Klinge, K., Kolinsky, P., Komminaho, Kari, Kozlovskaya, E., Larsen, T., Majdanski, M., Malek, J., Motuza, G., Novotny, O., Pietrasiak, R., Plenefisch, T., Ruzek, B., Sliaupa, S., Sroda, P., Swieczak, M., Tiira, Timo, Voss, P., Wiejacz, P., Department of Geosciences and Geography, and Institute of Seismology
- Subjects
1171 Geosciences ,Cratons ,geography ,geography.geographical_feature_category ,Rift ,Crustal recycling ,Crustal structure ,Mantle (geology) ,Europe ,Body waves ,Craton ,Geophysics ,Mohorovičić discontinuity ,13. Climate action ,Geochemistry and Petrology ,Lithosphere ,Institut für Geowissenschaften ,East European Craton ,Seismology ,Geology ,Terrane - Abstract
The Mohorovicic discontinuity, Moho for short, which marks the boundary between crust and mantle, is the main first-order structure within the lithosphere. Geodynamics and tectonic evolution determine its depth level and properties. Here, we present a map of the Moho in central Europe across the Teisseyre-Tornquist Zone, a region for which a number of previous studies are available. Our results are based on homogeneous and consistent processing of P- and S-receiver functions for the largest passive seismological data set in this region yet, consisting of more than 40 000 receiver functions from almost 500 station. Besides, we also provide new results for the crustal Vp/Vs ratio for the whole area. Our results are in good agreement with previous, more localized receiver function studies, as well as with the interpretation of seismic profiles, while at the same time resolving a higher level of detail than previous maps covering the area, for example regarding the Eifel Plume region, Rhine Graben and northern Alps. The close correspondence with the seismic data regarding crustal structure also increases confidence in use of the data in crustal corrections and the imaging of deeper structure, for which no independent seismic information is available. In addition to the pronounced, stepwise transition from crustal thicknesses of 30km in Phanerozoic Europe to more than 45 beneath the East European Craton, we can distinguish other terrane boundaries based on Moho depth as well as average crustal Vp/Vsratio and Moho phase amplitudes. The terranes with distinct crustal properties span a wide range of ages, from Palaeoproterozoic in Lithuania to Cenozoic in the Alps, reflecting the complex tectonic history of Europe. Crustal thickness and properties in the study area are also markedly influenced by tectonic overprinting, for example the formation of the Central European Basin System, and the European Cenozoic Rift System. In the areas affected by Cenozoic rifting and volcanism, thinning of the crust corresponds to lithospheric updoming reported in recent surface wave and S-receiver function studies, as expected for thermally induced deformation. The same correlation applies for crustal thickening, not only across the Trans-European Suture Zone, but also within the southern part of the Bohemian Massif. A high Poisson’s ratio of 0.27 is obtained for the craton, which is consistent with a thick mafic lower crust. In contrast, we typically find Poisson’s ratios around 0.25 for Phanerozoic Europe outside of deep sedimentary basins. Mapping of the thickness of the shallowest crustal layer, that is low-velocity sediments or weathered rock, indicates values in excess of 6km for the most pronounced basins in the study area, while thicknesses of less than 4km are found within the craton, central Germany and most of the Czech Republic.
- Published
- 2014
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