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    Wyświetlanie 1-5 z 5
    Tytuł:
    2-D seismic models of the lithosphere in the area of the Bransfield Strait, West Antarctica
    Autorzy:
    Grad, Marek
    Guterch, Aleksander
    Janik, Tomasz
    Środa, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2052732.pdf
    Data publikacji:
    1993
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    West Antarctica
    Bransfield Strait
    deep seismic sounding
    lithospheric structure
    subduction zone
    Źródło:
    Polish Polar Research; 1993, 14, 2; 123-151
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lithospheric structure across the Trans-European Suture Zone in NW Poland based on gravity data interpretation
    Autorzy:
    Królikowski, C.
    Petecki, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059901.pdf
    Data publikacji:
    2002
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Trans-European Suture Zone
    gravity anomalies
    structural-density model
    gravity stripping
    lithospheric structure
    Opis:
    We provide an analysis of geophysical and geological data from the Baltic segment of the Trans-European Suture Zone (TESZ). The construction of structural and density maps of the Zechstein-Mesozoic-Cenozoic complex has allowed identification of anomalies of basement orgin. As a result of interpretation of these anomalies, major structural elements of the lithosphere have been characterised. According to gravity modelling the crustal structure is more complicated than shown on velocity model along refraction and wide-angle reflection profile LT-7. Long-wavelength anomalies have been modelled in terms of lateral heterogeneity within the lower crust and upper mantle. In order to achieve a match between the observed and calculated gravity effects, it was necessary to assume dense upper mantle beneath the TESZ. Gravity data also indicate the presence of high-density bodies in the upper crust, and a complex transitional zone between crust and upper mantle in the TESZ.
    Źródło:
    Geological Quarterly; 2002, 46, 3; 235-246
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polish Geodynamic Expeditions - seismic structure of West Antarctica
    Autorzy:
    Guterch, Aleksander
    Grad, Marek
    Janik, Tomasz
    Środa, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2052477.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    West Antarctica
    Antarctic Peninsula
    Bransfield Strait
    deep seismic sounding
    crustal thickness
    lithospheric structure
    subduction zone
    Źródło:
    Polish Polar Research; 1998, 19, 1-2; 113-123
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seismic structure of the lithosphere between the East European Craton and the Carpathians from the net of CELEBRATION 2000 profiles in SE Poland
    Autorzy:
    Janik, T.
    Grad, M.
    Guterch, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059121.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    lithospheric structure
    East European Craton
    Trans-European Suture Zone
    Carpathians
    deep seismic soundings
    Moho map
    Opis:
    During the CELEBRATION 2000 experiment, the area of SE Poland was investigated by relatively dense system of deep seismic sounding profiles. Apart from five main profiles CEL01–CEL05, eight additional profiles were executed between the edge of the East European Craton and the Carphatians: CEL06, CEL11, CEL12, CEL13, CEL14, CEL21, CEL22 and CEL23. In this paper, we present results of modelling of refracted and reflected waves with use of a 2D ray tracing technique. All 13 profiles were jointly inter reted with verification of models at crossing points, and a quasi 3D model of the crust and upper mantle was developed. The obtained P-wave velocity models of the crust and uppermost mantle are very complex and show a differentiation of the seismic structure for tectonic units in SE Poland. The depth of the Moho discontinuity in the investigated area changes from about 30 to about 52 km. As a summary of all seismic models, the Moho depth map for SE Poland is presented, as well as a map of the extent of the most characteristic crustal elements in the area: a high velocity body in the upper crust, division into two- and three-layer consolidated crust, ranges of very deep layers with low velocities in the upper and middle crust, aproximate ranges of detected velocity anisotropy in the upper/middle crust, ranges of the high-velocity lower crust and high-velocity uppermost mantle. Both maps are com pared with the main struc tural el e ments from tec tonic map. This could form the base for a new geotectonic in ter pre ta tion of this com plex area.
    Źródło:
    Geological Quarterly; 2009, 53, 1; 141-158
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lithospheric structure of the Arabian Shield from joint inversion of P- and S-wave receiver functions and dispersion velocities
    Autorzy:
    Al-Amri, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/139282.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    receiver function
    crustal structure
    Arabian shield
    ambient noise
    seismics
    velocities
    lithospheric thickness
    struktura skorupowa
    tarcza arabska
    poziom zakłóceń
    sejsmika
    prędkość
    miąższość litosfery
    Opis:
    New velocity models of lithospheric thickness and velocity structure have been developed for the Arabian Shield by three tasks: 1) Computing P-Wave Receiver Functions (PRFs) and S-Wave Receiver Functions (SRFs) for all the broadband stations within the Saudi seismic networks. The number of receiver function waveforms depends on the recording time window and quality of the broadband station. 2) Computing ambient noise correlation Green’s functions for all available station pairs within the Saudi seismic networks to image the shear velocity in the crust and uppermost mantle beneath the Arabian Peninsula. Together they provided hundreds of additional, unique paths exclusively sampling the region of interest. Both phase and group velocities for all the resulting empirical Green’s functions have been measured and to be used in the joint inversion. 3) Jointly inverted the PRFs and SRFs obtained in task 1 with dispersion velocities measured on the Green’s functions obtained in task 2 and with fundamental-mode, Rayleigh-wave, group and phase velocities borrowed from the tomographic studies to precisely determine 1D crustal velocity structure and upper mantle. The analysis of the PRFs revealed values of 25 - 45 km for crustal thickness, with the thin crust next to the Red Sea and Gulf of Aqaba and the thicker crust under the platform, and Vp/Vs ratios in the 1.70 – 1.80 range, suggesting a range of compositions (felsic to mafic) for the shield’s crust. The migrated SRFs suggest lithospheric thicknesses in the 80-100 km range for portions of the shield close to the Red Sea and Gulf of Aqaba and near the Arabian Gulf. Generally, the novelty of the velocity models developed under this paper has consisted in the addition of SRF data to extend the velocity models down to lithospheric and sub-lithospheric depths.
    Źródło:
    Acta Geologica Polonica; 2015, 65, 2; 227-243
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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