Numerical modelling of seismic wave fields in models containing stacks of thin layers     

Dana Töpferová  Vlastislav Červený  Reviewer I. Pšenčík 《Studia Geophysica et Geodaetica》1987,31(4):344-358

Summary The possibilities of numerical modelling of high-frequency seismic wave fields in laterally varying layered structures containing stacks of thin layers are discussed. It is shown that the hybrid code based on the combination of the Gaussian beam summation method and of the matrix method (Thompson-Haskell, or other) may be very suitable for this purpose. The Guassian beam summation method is applied to thick smooth layers and the matrix method is locally applied to stacks of thin layers. Numerical examples for a simplified model of a transition layer between two halfspaces are shown. Certain interesting properties of waves reflected from a single interface and from a transition layer are discussed from the seismological point of view. Considerable attention is devoted to converted reflected waves.

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Problems of determination of the magnitude-frequency relation     

Vít Kárník  Dana Procházková  Reviewer J. Buben 《Studia Geophysica et Geodaetica》1971,15(1):95-100

Zusammenfassung Die Fehler in der Bestimmung der N(M)-Funktion werden diskutiert. Fragliche Ergebnisse können schon durch Vernachlässigung manchmal vorkommender nichtlinearer Verteilung der Punkte verursacht werden. Es wird gezeigt, dass auch bei linearer(log N, M) Verteilung verschiedene theoretische Voraussetzungen einzelner Berechnungsmethoden zu nicht vernachlässigbaren Unterschieden in den Ergebnissen führen können. Falls man die N(M)-Funktionen vergleichen will, müssen folgende Bedingungen erfüllt werden: Die Beobachtungsperiode, der Magnitudenbereich, die Klassifikationsgrösse und vor allem die Berechnungsmethode müssen identisch sein.

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Presented at the IASPEI conference, Madrid, Sept. 2, 1969.  相似文献   

The relation between earthquakes,basement and deep fault structures in Europe     

Dana Procházková  Zdeněk Mísař  Reviewer A. Zátopek 《Studia Geophysica et Geodaetica》1984,28(2):149-155

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Rockburst in the environs of příbram     

Procházková  Dana  Pěč  K. 《Studia Geophysica et Geodaetica》1981,25(3):293-294

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Ecological metrics and methods for GPS movement data     

Dana Paige Seidel  Eric Dougherty  Colin Carlson  Wayne M. Getz 《International journal of geographical information science》2018,32(11):2272-2293

The growing field of movement ecology uses high resolution movement data to analyze animal behavior across multiple scales: from individual foraging decisions to population-level space-use patterns. These analyses contribute to various subfields of ecology – inter alia behavioral, disease, landscape, resource, and wildlife – and facilitate novel exploration in fields ranging from conservation planning to public health. Despite the growing availability and general accessibility of animal movement data, much potential remains for the analytical methods of movement ecology to be incorporated in all types of geographic analyses. This review provides for the Geographical Information Sciences (GIS) community an overview of the most common movement metrics and methods of analysis employed by animal ecologists. Through illustrative applications, we emphasize the potential for movement analyses to promote transdisciplinary GIS/wildlife-ecology research.  相似文献   

Stable isotope and trace element status of subsistence-hunted bowhead and beluga whales in Alaska and gray whales in Chukotka     

Dehn LA  Follmann EH  Rosa C  Duffy LK  Thomas DL  Bratton GR  Taylor RJ  O'Hara TM 《Marine pollution bulletin》2006,52(3):301-319

Tissues of bowhead, beluga, and gray whales were analyzed for Ag, Cd, Cu, Se, Zn, THg and MeHg (belugas only). Delta15N and delta13C in muscle were used to estimate trophic position and feeding habitat, respectively. Trace element concentrations in tissues were significantly different among whale species. Hepatic Ag was higher in belugas than bowheads and gray whales. Gray whales had lower Cd concentrations in liver and kidney than bowhead and belugas and a sigmoid correlation of Cd with length was noted for all whales. Renal and hepatic Se and THg were higher in belugas than in baleen whales. The hepatic molar ratio of Se:THg exceeded 1:1 in all species and was negatively correlated to body length. Hepatic and renal Zn in subsistence-harvested gray whales was lower than concentrations for stranded whales. Se:THg molar ratios and tissue concentrations of Zn may show promise as potential indicators of immune status and animal health.  相似文献