34 research outputs found
First Report of Bacterial Spot Caused by Xanthomonas arboricola pv. pruni on Apricot in Hungary
Seismic anisotropy in the mantle of a tectonically inverted extensional basin: A shear-wave splitting and mantle xenolith study on the western Carpathian-Pannonian region
Information on seismic anisotropy in the Earth's mantle can be obtained from (1) shear-wave splitting analyses which allow to distinguish single or multi-layered anisotropy and delay time of the fast and slow polarized wave can indicate its thickness, and (2) studying mantle peridotites where seismic properties can be inferred from lattice preferred orientation of deformed minerals. We provide a detailed shear-wave splitting map of the western part of the Carpathian-Pannonian region (CPR), an extensional basin recently experiencing tectonic inversion, using splitting data. We then compare the results with seismic properties reported from mantle xenoliths to characterize the depth, thickness, and regional differences of the anisotropic layer in the mantle. Mantle anisotropy is different in the northern and the central/southern part of the western CPR. In the northern part, the lack of azimuthal dependence of the fast split S-wave indicates a single anisotropic layer, which agrees with xenolith data from the Nógrád-Gömör volcanic field. Systematic azimuthal variations in several stations in the central areas point to multiple anisotropic layers, which may be explained by two distinct xenolith subgroups described in the Bakony-Balaton Highland. The shallower layer probably has a ‘fossilized’ lithospheric structure, representing former asthenospheric flow, whereas the deeper one reflects structures attributed to present-day convergent tectonics, also observed in the regional NW-SE fast S-wave orientations. In the Styrian Basin at the western rim of the CPR, results are ambiguous as shear-wave splitting data hint at the presence of multiple anisotropic layers. Spatial coherency analysis of the splitting parameters places the center of the anisotropic layer at ~140–150 km depth under the Western Carpathians, which implies a total thickness of ~220–240 km. Thicknesses estimated from seismic properties of xenoliths give lower values, pointing to heterogeneously distributed anisotropy or different orientation of the mineral deformation structures
Cultured cells of the blood–brain barrier from apolipoprotein B-100 transgenic mice: effects of oxidized low-density lipoprotein treatment
Research in theoretical seismology
In this paper, research activities at the Theoretical Division of the Seismology
Department of GGRI (in short: Seismological Observatory) are summarized. The
reported investigations have been carried out since 1999, when the division was
founded with three members. Detailed discussions of the presented results can be
found in various national and international scientific journals
Correspondence of EOP and geomagnetic field
International audienceConnection of EOP with centred and eccentric geomagnetic dipole fields is described (with the use of Gaussian coefficients) for the epoch 1880-2000. The main tools of statistical investigation carried out were Laplace-type robust estimation (in case of ∆LOD) and the non-linear regression analysis (for P M ). On the basis of computations carried out it can be concluded that the statistical comparison of temporal variation of earth magnetic and EOP data shows significant correlation
Correspondence of EOP and geomagnetic field
International audienceConnection of EOP with centred and eccentric geomagnetic dipole fields is described (with the use of Gaussian coefficients) for the epoch 1880-2000. The main tools of statistical investigation carried out were Laplace-type robust estimation (in case of ∆LOD) and the non-linear regression analysis (for P M ). On the basis of computations carried out it can be concluded that the statistical comparison of temporal variation of earth magnetic and EOP data shows significant correlation