Deep Electrical Resistivity Structure of the European Lithosphere in Poland Derived from 3-D Inversion of Magnetotelluric Data     

Jóźwiak  Waldemar  Nowożyński  Krzysztof  Mazur  Stanisław  Jeż  Maciej 《Surveys in Geophysics》2022,43(5):1563-1586

Surveys in Geophysics - This paper presents a three-dimensional (3-D) model of the resistivity distribution in the European lithosphere at the junction between the East European Craton, the...  相似文献   

New terrestrial heat flow map of Europe after regional paleoclimatic correction application     

Jacek Majorowicz  Stanislaw Wybraniec 《International Journal of Earth Sciences》2011,100(4):881-887

Heat flow variations with depth in Europe can be explained by a model of surface temperature changes >10°C. New heat flow map of Europe is based on updated database of uncorrected heat flow values to which paleoclimatic correction is applied across the continent. Correction is depth dependent due to a diffusive thermal transfer of the surface temperature forcing of which glacial–interglacial history has the largest impact. It is obvious that large part of the uncorrected heat flow values in the existing heat flow databases from wells as shallow as few hundreds of meters is underestimated. This explains some very low uncorrected heat flow values 20–30 mW/m² in the shields and shallow basin areas of the craton. Also, heat flow values in other areas including orogenic belts are likely underestimated. Based on the uncorrected and corrected heat flow maps using 5 km × 5 km grid, we have calculated average heat flow values (uncorrected heat flow: 56.0 mW/m²; SD 20.3 mW/m² vs. corrected heat flow: 63.2 mW/m²; SD 19.6 m/Wm²) and heat loss for the continental part. Total heat loss is 928 E09 W for the uncorrected values versus corrected 1050 E09 W.  相似文献   

A photometric and spectroscopic study of WW And – an Algol-type,long period binary system with an accretion disc     

Michal Siwak  Stanislaw Zola  Tomasz Szymanski  Maria Kurpinska-Winiarska  Maciej Winiarski  Dorota Koziel-Wierzbowska  Waclaw Waniak  Michal Drahus 《New Astronomy》2012,17(8):691-696

We have analysed the available spectra of WW And and for the first time obtained a reasonably well defined radial velocity curve of the primary star. Combined with the available radial velocity curve of the secondary component, these data led to the first determination of the spectroscopic mass ratio of the system at q_spec = 0.16 ± 0.03. We also determined the radius of the accretion disc from analysis of the double-peaked H_α emission lines. Our new, high-precision, Johnson VRI and the previously-available Strömgren vby light curves were modelled with stellar and accretion disc models. A consistent model for WW And – a semidetached system harbouring an accretion disc which is optically thick in its inner region, but optically thin in the outer parts – agrees well with both spectroscopic and photometric data.  相似文献   

Complementary aspects of linear flood routing modelling and flood frequency analysis     

Witold G. Strupczewski  Vijay P. Singh  Stanislaw Weglarczyk  Krzysztof Kochanek  Henryk T. Mitosek 《水文研究》2006,20(16):3535-3554

Similarity and differences between linear flood routing modelling (LFRM) and flood frequency analysis (FFA) techniques are presented. The moment matching used in LFRM to approximate the impulse response function (IRF) was applied in FFA to derive the asymptotic bias caused by the false distribution assumption. Proceeding in this way, other estimation methods were used as approximation methods in FFA to derive the asymptotic bias. Using simulation experiments, the above investigation was extended to evaluate the sampling bias. As a feedback, the maximum likelihood method (MLM) can be used for approximating linear channel response (LCR) by the IRFs of conceptual models. Impulse responses of the convective diffusion and kinematic diffusion models were applied and developed as FFA models. Based on kinematic diffusion LFRM, the equivalence of estimation problems of discrete‐continuous distribution and single‐censored sample are shown both for the method of moments (MOM) and the MLM. Hence, the applicability of MOM is extended for the case of censored samples. Owing to the complexity and non‐linearity of hydrological systems and resulting processes, the use of simple models is often questionable. The rationale of simple models is discussed. The problems of model choice and overparameterization are common in mathematical modelling and FF modelling. Some results for the use of simple models in the stationary FFA are presented. The problems of model discrimination are then discussed. Finally, a conjunction of linear stochastic processes and LFRM is presented. The influence of river courses on stochastic properties of the runoff process is shown by combining Gaussian input with the LCR of the simplified Saint Venant model. It is shown that, from the classification of the ways of their development, both LFRM and FFA can benefit. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

Uplift and late orogenic deformation of the Central European Variscan belt as revealed by sediment provenance and structural record in the Carboniferous foreland basin of western Poland   总被引：1，自引：1，他引：0  

S. Mazur  P. Aleksandrowski  K. Turniak  L. Krzemiński  K. Mastalerz  A. Górecka-Nowak  L. Kurowski  P. Krzywiec  A. Żelaźniewicz  M. C. Fanning 《International Journal of Earth Sciences》2010,99(1):47-64

The Carboniferous foreland basin of western Poland contains a coherent succession of late Viséan through Westphalian turbidites derived from a uniform group of sources located within a continental magmatic arc. Detrital zircon geochronology indicates that two main crustal components were present in the source area of Namurian A sediments. They represent Late Devonian and Early Carboniferous ages, respectively. The detritus from Westphalian D beds is much more diversified and contains admixture of Late Carboniferous zircons suggesting rapid unroofing of Variscan igneous intrusions in the hinterland between Namurian A and Westphalian D times. Tectonic repetitions of tens of metres thick fault-bounded stratigraphic intervals, recorded in several wells, provide evidence for compressional regime that occurred in the SW part of the Carboniferous basin not earlier than during the Westphalian C and produced NW–SE trending folds, concordant with the structural grain of the adjacent, NE part of the Bohemian Massif.  相似文献   

The Tepla(?)/Saxothuringian suture in the Karkonosze–Izera massif, western Sudetes, central European Variscides     

Stanisław Mazur  Paweł Aleksandrowski 《International Journal of Earth Sciences》2001,90(2):341-360

The southern and eastern Karkonosze-Izera massif (northern Bohemian Massif) exposes blueschist facies rocks and MORB-type magmatic complexes. During Late Devonian to Early Carboniferous times, these were overthrust within a nappe pile toward the NW onto the pre-Variscan Saxothuringian basement composed of the Izera-Kowary metagranitoids and their envelope. The lowermost nappe (or parautochthonous?) unit of the pile is the low-grade metamorphosed Jewt3d complex, comprising a Devonian to Early Carboniferous sedimentary succession of the Saxothuringian passive margin. This is tectonically overlain by the South Karkonosze complex, which represents Ordovician-Silurian volcano-sedimentary infill of the Saxothuringian basin, affected by Late Devonian HP metamorphism. The uppermost nappe is the Early Palaeozoic epidote-amphibolite grade Leszczyniec MORB-like complex, cropping out on the eastern margin of the Karkonosze-Izera massif. It probably represents a fragment of obducted Saxothuringian basin floor. The nappe pile was stacked beneath the overriding upper plate margin, now concealed below the Intra-Sudetic basin and hypothesized to represent a fragment of the Tepla-Barrandian terrane. The nappe stacking, triggered by buoyancy-controlled upward extrusion of the subducted continental slab, was the main mechanism for the exhumation of HP rocks. The final stages of the NW-ward nappe stacking were accompanied and followed by SE-directed Early Carboniferous extensional collapse. The lower plate of the suture zone was uplifted at that time and intruded by the ~330-Ma-old, nearly undeformed Karkonosze granite pluton. As a result of the collapse, the Tepla-Barrandian(?) upper plate was downthrown on shear zones and brittle faults and buried under several km-thick synorogenic Late Tournaisian(?) through Namurian and post-orogenic Late Carboniferous-Early Permian succession of the Intra-Sudetic basin. The south and east Karkonosze suture most probably is a fragment of the Tepla/Saxothuringian (Münchberg-Tepla) suture belt known from the western Bohemian Massif.  相似文献   

Impulse response of the kinematic diffusion model as a probability distribution of hydrologic samples with zero values     

Witold G. Strupczewski  Stanislaw Weglarczyk  Vijay P. Singh   《Journal of Hydrology》2003,270(3-4):328-351

It is hypothesized that the unit impulse response of a linearized kinematic diffusion (KD) model is a probability distribution suitable for frequency analysis of hydrologic samples with zero values. Such samples may include data on monthly precipitation in dry seasons, annual low flow, and annual maximum peak discharge observed in arid and semiarid regions. The hypothesized probability distribution has two parameters, which are estimated using the methods of moments (MOM) and maximum likelihood (MLM). Also estimated are errors in quantiles for MOM and MLM. The distribution shows an equivalency of MOM and MLM with respect to the mean value—an important property for ML-estimation in the case of the unknown true distribution function. The hypothesized KD distribution is tested on 44 discharge data series and compared with the Muskingum-like (M-like) probability distribution function. A comparison of empirical distribution with KD and M-like distributions shows that MOM better reproduces the upper tail of the distribution, while MLM is more robust for higher sample values and more conditioned on the value of the probability of the zero value event. The KD-model is suitable for frequency analysis of short samples with zero values and it is more universal than the M-like model as its modal value cannot be only equaled to zero value but also to any positive value.  相似文献   

Book reviews     

Allan M. Rubin  Gerardo G. Tango  Jeremy Bloxham  Stanislaw Wybraniec  Adam Łyszkowicz  Gary A. Robbins  Benoit Cushman-Roisin  David S. Gutzler  Carlos Lozano  Hanna Pawłowska 《Pure and Applied Geophysics》1991,137(1-2):147-174

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On waveguide propagation of Alfvén waves at the plasmapause     

I.S. Dmitrienko  V.A. Mazur 《Planetary and Space Science》1985,33(5):471-477

A study is made of the influence of cool dispersion (due to ion inertia) upon the propagation of Alfvén waves in the magnetosphere. It is shown that the Alfvén velocity minimum elongated along the magnetic field, may act as a waveguide. Some waveguiding properties of the plasmapause are investigated and relevant eigen-modes determined. The possibility of interpreting geomagnetic pulsations of various types as eigen-oscillations of the waveguide at the plasmapause, is discussed.  相似文献   

Paleomagnetism of lower cretaceous Lavas on Jamaica     

Univ.-Doz. Dr. Peter Steinhauser  Prof. Dr. Stanislaw A. Vincenz 《Meteorology and Atmospheric Physics》1973,22(2-3):325-336

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