Über die Verteilung der aus Gezeitenbeobachtungen bestimmten gravimetrischen Faktoren in Europa

auamaumuu am, n u a¶rt;u nuu n ¶rt;a ₂, ₂, ₁ u ₁ (u. 1–4). na ¶rt;a ¶rt;am au ¶rt;um au an¶rt;u mu naam. a n¶rt;aam unam nu nuu nna m uu u u mmu mam ¶rt; uu u a a mau n.

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Vorgetragen am 2. Internationalen Symposium Geodäsie und Physik der Erde, Potsdam, Mai 1973.     

Model of earthquake occurrence in the European area

Summary The time distribution of earthquake occurrence in the European area is investigated by statistical laws. The original data of shallow-focus earthquakes are taken from the European catalogue 1901–1967. Evidence is given that the process with the negative binomial entries as a model describing the occurrence of shallow-focus earthquakes is better than the Poisson process. Further, the influence of magnitude classes and magnitude threshold value on the time distribution of earthquake occurrence is examined.Communication presented at the XIII General Assembly of the European Seismological Commission in Brasov in 1972.     

Signal and noise coherence determination for the Uppsala seismograph array station

Summary The Uppsala seismograph array station (UPSAS) has been tested with respect to mutual resemblance of body-wave signals recorded by the individual array sensors. Records ofP-, pP- andPKP-phases from ten teleseismic earthquakes and the HANDLEY explosion, in the magnitude range fromm _b =5.8 tom _b =6.9, are investigated in detail. Calculated coherence and cross-correlation functions confirm that the area selected for UPSAS provides extremely favourable conditions for the operation of an array station. High signal similarity across UPSAS shows no obvious dependence upon the location of the focus or the magnitude. Natural and man-made events provide comparable results.     

Dynamic manifestations of the geomagnetic field in the Quaternary continental sediments of Czechoslovakia

Summary The paper brings a brief geological asessment of the sedimentational cycles, analyses the methods of collection and investigation of samples and the representativeness of the results obtained. Problems of magnetic cleaning and the types of demagnetization curves investigated are discussed. The continuous nature of the variations of the magnetic declination, inclination and remanent magnetization, determined by palaeomagnetic investigation of Quaternary sediments, is also discussed. The conclusion contains the principal facts about the dynamics of the geomagnetic field in the Quaternary and points out the possibility of applying them to the theory of the geomagnetic field, as well as to geological correlations.     

The effect of initial data in adjusting conditional observations

Summary In the introduction the effect of neglecting the accuracy of the initial data is mentioned in adjusting conditional observations, because this essentially causes the accuracy of the adjusted quantities to be overrated. The effect of changes (errors) of the initial data is investigated for two cases: a) when the initial data are given, unmeasured quantities; b) when the initial data are given and measured quantities which form the conditions of adjustment (e.g., gyrotheodolite directional angles). This effect was rejected in a change of the corrections, in the vrst case according to (14), and in the second according to (18). The effect of the changes (errors) of the initial data was also investigated with regard to the matrix of the co-factors of the adjusted quantities. This matrix, taking into account the errors of the initial data described by matrixQww, and the errors of the measurements themselves, described by matrix (26), is expressed by (31).Dedicated to 90th Birthday of Professor Frantiek Fiala     

Reduction of gravity observations with digital computer

Summary The paper gives a simple method for the reduction of Gravity observations with electronic computer. The major part of the gravity reductions is the computation of the correction for the far zones. This process was so simplified, that all far zone correction parameters depend on the topography can be determined — independent of the gravity measurement — for the whole survey area in one computer run (subprogram). The computed gravity data will be stored for plotter or other programs.

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Zusammenfassung Die Arbeit gibt eine einfache Methode für die Reduktion gravimetrischer Meßdaten mit elektronischer Rechenmaschine. Den größten Teil der Reduktion von gravimetrischen Meßdaten machen die Korrektionen für die fernen Zonen aus. Diese Prozedur wurde so vereinfacht, daß man alle — von der Topographie abhängigen — Parameter der Fernzonenkorrektur, unabhängig von den gravimetrischen Me\daten, für das ganze Meßgebiet in einem Rechenprozeß berechnen kann. Die reduzierten gravimetrischen Meßdaten werden für Plotter oder andere Programme eingespeichert.

     

Terrestrial heat flow in Hungarian Permian strata

Summary Latest measurements of terrestrial heat flow in the Hungarian and Russian parts of the Carpathian basin confirm previously measured high flow values between 2.0–3.3 cal/cm² sec. Recent measurement in the Permian anticline structure of the Mecseck. Mts. in Hungary gave 2.4 cal/cm²sec, whereas in the Russian part of the basin, near to the Hungarian border 2.6 cal/cm² sec was measured in Miocene sediments. For more than 100000 km² surface of the Carpathian basin covered by Hungary and parts of Slovakia and Russian the high heat flow is an established fact.     

Structural control and history of origin of hydrothermal metallogeny in western Cuba

The main structural-lithological factors responsible for the localization of hydrothermal mineralization on a regional, as well as on a local scale in the metallogenic province of western Cuba are summarized. The supply function of regional fault structures extending towards depth is emphasized and light is thrown on the localization of hydrothermal veins in fissures of the folded San Cayetano Formation. Stress has been laid on the genetic and chronological independence of pyrite bodies and hydrothermal veins. Six mineralization stages have been defined and their general succession in the metallogenic area under consideration has been determined.

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Resumen Los factores principales litológico-estructurales, que causan la predisposición de la localización de los yacimientos hidrotermales en las dimensiones regionales y locales en la region de Cuba occidental, están sumarizados. La importancia de las dislocaciones regionales para el aporte de las soluciones hidrotermales está subrayada y las causas de la localización de las vetas hidrotermales en las ac-grietas de la formacion plegada de San Cayetano están aclaradas. La independencia genética y cronológica de los cuerpos de pirita y de las vetas hidrotermales polimetálicas está discutida. Seis estados de la mineralización hidrotermal están identificados y la succesión de la validez general para toda la region metalogenética de Cuba occidental está construida.

     

Dichte und Lichtbrechung der Moldavite von Něchov

In this experimental work I studied the correlation of the specific gravity and index of refraction at 19 moldavites from a finding place in Nchov. This place is in the south of Bohemia, in a district of eské Budjovice (Budweis). The reason for this work was the extraordinary declaration of the correlation of the specific gravity and index of refraction at one moldavite from Nchov that is: d=2,395 and n _D =1,5033.These declarations were settled by Nováek. The results of these measurings have shown that the linear correlation of the specific gravity and index of refraction of the moldavites from other finding places are characteristic also for these ones. The definition of this correlation at 19 pieces of moldavites from Nchov shows also this linear character in the measuring of values d=2,355–2,395 and n _D =1,4870–1,4950.In this work there were settled also some other dates of unity (so-called in couple-moldavites). But we must not oversee certain vaccilations of the declaration at the moldavites from Nchov, as at those from other finding places. The secularity of these declarations about the moldavites of Nchov lies also therein, that the avarage value of the correlation of specific gravity and index of refraction of this finding place is higher than those of other places.

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Herrn Dr. Walter Weiskirchner, Dozent an der Universität Tübingen, danke ich herzlich für die freundliche Durchsicht der Arbeit.