Expansions of the double product of the global gravity field

Summary Four fundamental forms of expansion of the double product of the gravity function into an infinite series are derived. Two isotropic parts are separated, one is expressed by Legendre polynomials and the other by invariants of Wigner's D-matrices.

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Effects of the IMF pro- and anti-sectors in the winter midlatitude ionosphere

Summary On the basis of the 1966–73 data, the effect of the difference between pro- and anti-sectors of the IMF is found to be negligible in the winter midlatitude (Central Europe) ionosphere contrary to the dominant effect of this difference in the high-latitude ionosphere found earlier.

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a ¶rt;a a 1966–73. u¶rt;m u m amu ¶rt; pro- u anti- mau . na a u ¶rt;um (¶rt; na) u, , a naa a, naum um u.

     

On the expanding earth hypothesis

Summary The hypothesis of an expanding Earth is discussed on the basis of lunar laser ranging It is provcd that the given data do not indicate a secular increase in the principal moment of the Earth's inertia which would have to occur if the Earth were really expanding.

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On the accuracy of location of local shocks on the territory of Czechoslovakia and adjacent areas

Summary The calculation procedures for determining epicentre parameters of weak near shocks with foci in Poland are discussed and tested for explosions with known epicentres.

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Effect of cofactors of adjusted and unadjusted quantities on their functions

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Numerical modelling of time-harmonic seismic wave fields in simple structures by the Gaussian beam method. Part II

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Magnetic susceptibility anisotropy of deformed rocks

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Storm surge versus turbidite origin of the Coniacian to Santonian sediments in the eastern part of the Bohemian Cretaceous Basin

A flyschoid facies occurs in the Bezno Formation (Coniacian up to Santonian) of the eastern marginal part of the Bohemian Cretaceous Basin. According toJerzykiewicz (1970, 1971) this facies is of deep water, turbidite origin. He based his interpretation on the study of sedimentary structures. New palaeogeographic reconstruction of lithofacies relations, investigation of deep drillings and detailed sedimentological analysis, however, allowed new results concerning the sedimentary environments and depositional mechanism of this facies. According to the new model presented here, this flyschoid facies was deposited in a shallow marine environment. Clayey sedimentation was the natural response to normal environmental conditions, whereas sandstone intercalations reflect anomalous conditions during heavy storms. During these events, sands were transported basinwards up to distances of 25 km, with normal bottom currents, as well as turbidity currents, acted as transporting mechanisms. This flyschoid facies corresponds to other examples of clayey sequences with sandy storm layers.

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Zusammenfassung Die Bezno Schichtenfolge (Coniac bis Santon) enthält im östlichen Randteil des Böhmischen Kreidebeckens sogenannte flyschoide Fazies. NachJerzykiewicz (1970, 1971) entstand sie im tiefen Wasser wie echte Turbidite. Die paläogeographische Rekonstruktion von Faziesbeziehungen, ausführliche Bearbeitung der Schichtenfolge in Bohrungen, und vollständige Beckenanalyse ermöglichten eine Neudeutung von Transportmechanismen und Ablagerungsmilieu. Es werden Beweise für Flachwassersedimentation erbracht. Das Sedimentationsgebiet entsprach einem Bereich der Tonablagerung, der von Zeit zu Zeit während anomaler Bedingungen — seltenen, sehr schweren Sturmfluten durch Sandzufuhr gestört wurde. Während dieser Sturmfluten wurde Sand ins Becken geschüttet bis zu einer Entfernung von 25 km von der Küste. Die Funktion von Traktionströmen wird diskutiert im Verhältnis zum Einfluß von Trübeströmen. Die beschriebene flyschoide Fazies entspricht Schichtfolgen mit sandigen Sturmflutlagen.

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Résumé Dans la partie marginale du Bassin Crétacée de Bohême, la formation de Bezno (Coniacien à Santonien) est caractérisée par le développement du faciès flyschoide. Ce faciès a été étudié parJerzykiewicz (1970, 1971), qui a proposé son origine dans un bassin profond, sous l'activité de courants de turbidité. L'étude détaillée de la succession des couches dans les forages profonds, de nouvelles données sédimentologiques ainsi que la reconstruction paléogéographique ont amené l'auteur à établir un nouveau modèle de mécanisme de transport dans les milieux de sédimentation. Selon ce modèle le faciès flyschoid se déposerait dans la mer épicontinentale peu profonde. Les argiles marquent les conditions normales de ce milieu sédimentaire; les grès reflètent des conditions hydrodynamiques anomales au cours de tempêtes rares et très fortes. Durant ces tempêtes les sables côtiers ont été redéposés dans des fonds plus profonds jusqu' à une distance de 25 km. La fonction des courants de traction est discutée en rapport avec l'influence des courants de turbidité entant qu' agents de transport. Le faciès étudié est comparable avec les séquences des argiles à intercalations de grès.

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