Variszische duktile Tektonik im Böhmischen Massiv

Zusammenfassung Die Verformungsanalyse und Richtungsverteilung der Streckungslineationen in den duktilen Bereichen des Böhmischen Massiv zusammen genommen mit der Lage der Foliationsflächen deuten darauf hin, daß die Blattverschiebungen während der variszischen Deformation die entscheidende Rolle gespielt haben. Die Kompatibilität der Deformation im Gesamtbereich wurde durch Überschiebungen und Transpression in den durch die Blattverschiebungen begrenzten Blöcke erreicht. Das variszische Tektogen wurde als Blattverschiebungsorogen auf einer kontinentalen oberproterozoischen Kruste angelegt. Die Zonen mit intensiver Krustenverkürzung und damit größter Krustenmächtigkeit sind durch weiträumige Anatexis und granitische Intrusionen gekennzeichnet.

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The strain analysis and synthesis of the orientation distribution of stretching lineations and of foliations in the ductile domains of the Bohemian Massif reveals the prominent role of the strike-slip tectonics in the Variscan orogeny. The compatibility of the deformation in the whole area was reached through the thrusting and transpression and/or transtension within the blocks divided by the ductile strikeslips. The Variscides of the Bohemian Massif were superposed on the Upper Proterozoic crust. The zones of the largest crustal shortening and of the greatest crustal thickness are characterised by the extensive anatexis and granite intrusions.

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Résumé L'analyse des déformations finies et la répartition des linéations d'étirement et des surfaces de foliation dans le Massif de Bohème révèlent le rôle important joué par les mouvements de décrochement dans le développement tectonique varisque. La compatibilité des déformations dans l'ensemble du domaine a été realisée par des chevauchements au sein des blocs délimités par les décrochements. Le tectogène varisque dans le massif de Bohème s'est superposé à une croûte continentale héritée du Protérozoïque supérieur. Les zones d'intense raccourcissement et par conséquent d'intense épaississement crustal sont caractérisées par une anatexie importante et contiennent les plus grands plutons granitiques.

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On the problem of constructing density models of the lithosphere

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Computation of ray amplitudes in inhomogeneous media with curved interfaces

Summary This paper is a continuation of[1]. It is mainly devoted to problems connected with the application of the method of determination of geometrical spreading in laterally inhomogeneous media with curved interfaces based on the solution of eight (in a three-dimensional medium) or two (in a two-dimensional medium) linear ordinary differential equations of the first order. The method of determination of the partial derivatives of velocity with respect to the special coordinates, connected with the ray under investigation, and the methods of determination of the initial values for the system of differential equations at the source and at the interfaces are proposed.     

Force function of two general spheroids

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Methods of computing the partial derivatives of dispersion curves

Summary Three methods of computing the partial derivatives of dispersion curves are briefly described and compared: numerical differentiation, variational methods and an implicit function method.     

Anomalous induction in the Carpathians

nuam mam uu auauaum n aumua ¶rt; a 9 n mau ¶rt; nu No V, na anam. ma uam a aa u¶rt;uu aau ¶rt; uu u mau anamau. m m u¶rt;uu u aauuaa amma aamumua aa ma. ¶rt;a a m¶rt; mau ¶rt; aumua u mm a¶rt;u n a m u mau. uamua aau ¶rt;m u mu ma, m m ¶rt;u u umu m n. maum aamumuu n nma mmuuu aauu aumau ¶rt; m ¶rt;- ¶rt;¶rt;muu mm ¶rt; nu u m¶rt; am.

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A substantial part of this paper was presented at the IAGA symposium Relations between External and Internal Magnetic Variations, XVI. IUGG General Assembly, August–September 1975, Grenoble.     

Reduction of the number of knots in the approximation by smoothed cubic splines

Summary A method of approximation, minimizing the number of knots and satisfying the smoothing and fitting properties of the cubic spline approximation, is suggested. Two modifications of the method are presented. The first approach is specified to provide an adequate simple approximation to the digitalized smooth curve (such as the velocity-depth function in seismology), while the second is more general and may be used to approximate geophysical measurements, which may include errors.