Seismic hazard in the Sannio-Matese area of Italy

The assessment of seismic hazard at five selected sites in the Sannio-Matese region is based on the computer program SRAMSC. Owing to the extensive historical data base for the output parameter, the MSK intensiy is chosen. The seismicity model is made up of five narrow area seismic sources. Circular or elliptical macroseismic fields are assigned to individual sources. A generalized Kövesligethy equation is used for this purpose as the attenuation relationship. The study reveals similar and a rather high hazard at the sites at Benevento, Boiano, and Melfi, which are located in the zone of highest seismic activity. At the Pomigliano and Lucera sites, the assessed hazard is much lower.     

Metamorphic zones of the Vrbno and Rejvíz series,the Hrubý Jeseník Mountains,Czechoslovakia

Summary The Devonian eugeosynclinal volcano-sedimentary complex (the Vrbno and Rejvíz series) building the envelope unit of the Desná Dome in the Hrubý Jeseník Mts. was regionally metamorphosed during the polyphase Variscan metamorphism. In it, five zones have been distinguished: the chlorite, biotite, garnet, staurolite and sillimanite ones. The metamorphism was of progressive character and its intensity (temperature) increased in the Vrbno series from S to N, and in the Rejvíz series from SE to NW. The mineral assemblages of rocks correspond to medium-pressure metamorphism in the greenschist, albite-epidote-amphibolite and the amphibolite facies. The earlier metamorphic phase (I) attained at maximum the staurolite zone. The later metamorphic phase (II) was a medium-pressure, too (5.5 kb at a temperature of 670° to 700°C), but it attained a higher temperature. It is represented by the sillimanite zone in which staurolite is unstable and is replaced by muscovite. Almandine does not change. In this paper, among others, the mutual relationships between sillimanite, biotite, staurolite and muscovite, existing in proximity of the sillimanite isograd, are discussed.

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Metamorphe Zonen in der Vrbno- und in der Rejvíz-Serie des Hrubý Jeseník-(Altvater-) Gebirges, Tschechoslowakei

Zusammenfassung Der devonische, eugeosynklinale, vulkanisch-sedimentäre Komplex (die Vrbno-und die Rejvíz Serie), der die Hülle der Desná-Aufwölbung im Hrubý-Jenseník-(Altvater-)Gebirge aufbaut, wurde während der polyphasen variszischen Metamorphose regional metamorphisiert. Es können darin fünf Zonen unterschieden werden: die Chlorit-, die Biotit-, die Granat-, die Staurolith-und die Sillimanit-Zone. Die Metamorphose war von aufsteigendem Charakter und nahm in der Vrbno-Serie von S nach N zu, in der Rejvíz-Serie von SE nach NW. Die Mineralparagenesen der Gesteine entsprechen Metamorphosen mittlerer Drücke in Grünschiefer-, Albit-Epidot-Amphibolit-und Amphibolit-Fazies. Die ältere metamorphe Phase (I) erreichte am Höhepunkt die Staurolith-Zone. Die spätere metamorphe Phase (II) war ebenfalls von mittlerem Druck (5,5 kb bei einer Temperatur von 670–700°C), erreichte aber höhere Temperaturen. Sie wird durch die Sillimanit-Zone, in welcher Staurolith instabil ist und durch Muskovit ersetzt wird, repräsentiert. Almandin ändert sich nicht. In der Arbeit werden unter anderem die gegenseitigen Bezjehungen zwischen Sillimanit, Biotit, Staurolith und Muskovit diskutiert, die nahe der Sillimanit-Isograden existieren.

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With 10 Figures     

A new map of recent movements of the West Carpathians

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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.     

Magnetic variations excited by a radial magnetic dipole located in the earth's core

Summary Theoretical formulae are derived for computing a variable magnetic field, excited by a harmonically oscillating radial magnetic dipole (RMD), located eccentrically at the surface of the Earth's core. By numerical computations, using a three-layered conductivity model of the Earth, it is proved that the field due to this source, computed for the surface of the Earth, is relatively weak in comparison to the field of a stationary magnetic dipole, provided the period of the changes is less than 500 years. The zone of influence of the RMD at the Earth's surface is also determined and on its basis a number of conclusions were drawn with respect to representing the non-dipole part of the geomagnetic field by means of the RMD system in the Earth's core.Dedicated to RNDr. Jan Pícha, CSc., on his 60th Birthday     

Changes of electrical conductivity in the vicinity of the curie temperature of basaltic rocks — theoretical model

Summary Samples of basalts, haematites and magnetites display either temporary or permanent (magnetite) weakening of the increase of the electrical conductivity with increasing temperature in the vicinity of their Curie temperature. Using the second quantization, this paper explains the observed pattern of the electrical conductivity adequately for magnetite and approximately for the other rocks by means of a quantum theory model of ferromagnetic minerals. This theory describes only the electron component of the electrical conductivity, which is responsible for the Curie temperature effect.Dedicated to RNDr. Jan Pícha, CSc., on his 60th Birthday     

Optimum structures of free levelling traverses

Summary Given a configuration of points of a levelling traverse, it is possible to determine their heights according to various plans by applying various optimization criteria. D-, restricted D-and L-optimum plans for various configurations are generally treated. Of two plans belonging to one and the same configuration we consider the one whose determinant, or trace of the covariance matrix of adjusted heights is minimum, to be optimal.Dedicated to RNDr Jan Pícha, CSc., on his 60th Birthday     

Relationship between the bitumen and kerogen of an Australian torbanite

A benzene-methanol extract of an Australian Permo-Carboniferous torbanite from New South Wales was analyzed by a computerized gas chromatographic-mass spectrometric system. Acidic and neutral fractions of the extract contained C₁₂_C₂₇ straight chain, saturated acids; C₁₃-C₂₉ straight chain hydrocarbons; cyclohexyl alkanes; pentacyclic triterpanes; naphthalene, anthracene, biphenyl, benzanthracene, terphenyl, and perylene, and many methyl substituted analogs of these polycyclic aromatic systems. It is concluded that nearly all of these compounds were derived from Botryococcus braunii, a major contributor to the biomass of Australian torbanite.     

On some sources of uncertainty in the Lyman-α ionization-rate calculation

Summary The effect of the uncertainty and variability in the absorption cross-section, ionization cross-section and the Lyman- line shape on the Lyman- ionization-rate calculation is studied. The effect of the variability of the Lyman- line shape seems to be negligible. The effect of the ionization cross-section is rather small. The greatest and very significant effect, particularly at lower altitudes, is due to the discrepancy in the absorption cross-section data. Some ionospheric and atmospheric consequences are briefly discussed.