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91.
Mariusz BiałEcki 《Acta Geophysica》2015,63(5):1205-1215
This paper outlines an idea for an explanation of a mechanism underlying the shape of the universal curve of the Earthquake Recurrence Time Distributions. The proposed simple stochastic cellular automaton model is reproducing the gamma distribution fit with the proper value of parameter γ characterizing the Earth’s seismicity and also imitates a deviation from the fit at short interevent times, as observed in real data.Thus the model suggests an explanation of the universal pattern of rescaled Earthquake Recurrence Time Distributions in terms of combinatorial rules for accumulation and abrupt release of seismic energy. 相似文献
92.
93.
94.
The paper concerns investigation of the credibility of tectonic interpretation of GNSS strain rates. The analysis was focused on stable regions, where the crustal deformations are small and the reliability of GNSS velocities is questionable. We are showing how the unreliable motion of stations affects calculated strains around them. We expressed distribution of local principal strains by a sinusoidal function and used them to investigate the significance of strain distortion. Then we used this method to investigate real motions of GNSS stations. As a test object we used Polish GNSS stations belonging to the ASG-EUPOS network. Station velocities were estimated on the basis of the 4.5 years of observations. The results let us identify stations that disturb the obtained local GNSS strain rate field. After verification and exclusion of some stations, the new GNSS strains show a much greater internal compatibility and also better fit to the directions of lithosphere stresses. 相似文献
95.
An analysis of the mechanism of flow in ice-covered rivers 总被引:1,自引:0,他引:1
Zygmunt Meyer 《Acta Geophysica》2010,58(2):337-355
The paper presents a mechanism of flow of water in an ice-covered river in the case of movable bottom. The analysis is based
upon the principal hydrodynamics equations of turbulent flow in the case of steady uniform motion. It leads to the conclusion
of linear distribution of the turbulent shear stress with depth. It allows to obtain the vertical distribution of velocity
of flowing water under the assumption that at the boundaries (movable bottom and ice) the viscosity of water is greater than
the kinematics viscosity. The relations describing the vertical distribution of velocity of flowing water, as well as the
eddy viscosity coefficient under these conditions, are given. 相似文献
96.
Marianna?PastuszakEmail author Klaus?Nagel Alfred?Grelowski Volker?Mohrholz Mariusz?Zalewski 《Estuaries and Coasts》2003,26(5):1238-1254
The Pomeranian Bay is a coastal region fed by the Oder River, one of the seven largest Baltic rivers, whose waters flow through
a large and complex estuarine system before entering the bay. Nutrients (NO3
−, NO2
−, NH4
+, Ntot, PO4
3−, Ptot, DSi), chlorophylla concentrations, oxygen content, salinity, and temperature were measured in the Pomeranian Bay in nine seasonally distributed
cruises during 1993–1997. Strong spatial and temporal patterns were observed and they were governed by: the seasonally variable
riverine water-nutrient discharges, the seasonally variable uptake of nutrients and their cycling in the river estuary and
the Bay, the character of water exchange between the Pomeranian Bay and the Szczecin Lagoon, and the water flow patterns in
the Bay that are dominated by wind-driven circulation. Easterly winds resulted in water and nutrient transport along the German
coastline, while westerly winds confined the nutrient rich riverine waters to the Polish coast and transported them eastward
beyond the study area. Two water masses, coastal and open, characterized by different chemical and physical parameters and
chla content were found in the Bay independently of the season. The role of the Oder estuary in nutrient transformation, as well
as the role of temperature in transformation processes is stressed in the paper. The DIN:DIP:DSi ratio indicated that phosphorus
most probably played a limiting role in phytoplankton production in the Bay in spring, while nitrogen did the same in summer.
During the spring bloom, predominated by diatoms, the DSi:DIN ratio dropped to 0.1 in the coastal waters and to 0.6 in the
open bay waters, pointing to silicon limitation of diatom growth, similar to what is being observed in other Baltic regions. 相似文献
97.
Monika Agnieszka Kusiak Artur Kdzior Mariusz Paszkowski Kazuhiro Suzuki Ignacio Gonzlez-lvarez Bolesaw Wajsprych Marek Doktor 《Lithos》2006,88(1-4):56-71
This paper reports the results of CHIME (chemical Th–U–Pb isochron method) dating of detrital monazites from Carboniferous sandstones in the Upper Silesia Coal Basin (USCB). A total of 4739 spots on 863 monazite grains were analyzed from samples of sandstone derived from six stratigraphic units in the sedimentary sequence. Age distributions were identified in detrital monazites from the USCB sequence and correlated with specific dated domains in potential source areas. Most monazites in all samples yielded ca. 300–320 Ma (Variscan) ages; however, eo-Variscan, Caledonian and Cadomian ages were also obtained. The predominant ages are comparable to reported ages of certain tectonostratigraphic domains in the polyorogenic Bohemian Massif (BM), which suggests that various crystalline lithologies in the BM were the dominant sources of USCB sediments. 相似文献