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  • Articles  (2,691,177)
  • Geosciences  (2,691,177)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 109 (1973), S. 1738-1742 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Free radial vibration of a non-homogeneous circular plate of variable thickness has been studied. The thickness at a distancer from the axis through the centre of the plate perpendicular to the middle surface is chosen to be a function ofr. The problem has been solved for a disc with a central hole and also for one having no central hole.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 109 (1973), S. 1718-1727 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Earthquake parameters for the forty aftershocks of the main Koyna earthquake of 10 December, 1967, have been determined. Depths of the foci of the earthquakes have been found to vary between 2 to 17 km. The velocities for the phasesP g ,P *,P n have been observed to be 5.78±0.00, 6.58±0.04, 8.19±0.02 km/sec, and forS g ,S *,S n to be 3.42±0.00, 3.92±0.01 and 4.62±0.01 km/sec respectively. A two-layered crustal model has been interpreted for the Peninsular shield with the average thickness of the granitic layer as 20 km and that for the basaltic layer as 18.7 km. A plot of the epicenters suggests a NNE to SSW orientation of the fault.
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  • 3
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    Electronic Resource
    Springer
    Pure and applied geophysics 109 (1973), S. 1752-1761 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The spectral amplitude fields of seismic waves produced by directed (non-spherical) and undirected (spherical) explosive sources are described. The following four cases were investigated: a spherical source located at the bottom of a borehole, a spherical, a hemi-spherical, and a conical source placed at the wall of a trench. The geophones measuring theX, Y andZ components of the seismic waves produced were situated on the Earth's surface within a circle round the epicentre of each source. The records were Fourier analyzed and amplitude spectra were used to establish spectral amplitude fields of these components. Amplitude and frequency variations of the seismic wave patterns are discussed in the paper.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 109 (1973), S. 1796-1809 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The electric and magnetic field variations over an arbitrarily sloping ocean floor are represented in series of Bessel functions forH-polarized uniform plane wave excitation. Calculation of the spatial variations of electric eurrents and apparent resistivity near a coastline will determine the usefulness of the magnetotelluric method in this application.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 109 (1973), S. 1781-1788 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Forced hydromagnetic oscillations in the outer core due to stress at its top are studied by means of a simple linear theoretical model originally proposed byHide [1] for the free oscillation studies. Both the magnetic and the inertial modes are excited. The expressions for the velocity, magnetic and vorticity fields are presented for a variety of stresses. They depend upon the wave number and frequency. In a numerical example wherein the stress varies periodically both in the space and the time, the amplitude of the induced magnetic field is found to be significant for reasonable values of various parameters.
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  • 6
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    Springer
    Pure and applied geophysics 109 (1973), S. 1862-1869 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Résumé Dans le présent travail on a procédé à une expérience pour déterminer les variations temporelles des principaux paramètres aéronomiques en utilisant des données expérimentales par la méthode A3 de mesure de l'absorption ionosphérique, la méthode ‘phase-altitude’ et des données satellites aux rayons X durs. On a examiné les variations diurnes et les variations temporelles lors de SID effet durant le 21 Août 1969, de la densité électroniqueN(t) et du coefficient de récombinaison α′(t). On a montré que lors de SID effet α′(t) s'accroît.
    Notes: Summary In this paper an attempt is made to define the time variations of theD-region main aeronomical parameters under non-equilibrium conditions by using experimental data by the A3 method, phase-height method and satellite data for the short-wave X-radiation. The SID effect of day-time and time variations of 21 August 1969 electron concentrationN(t) and recombination coefficient α′(t) are investigated. It is shown that during SID effect α′(t) increases.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 11 (1948), S. 8-18 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Summary The vertical temperature gradient for selectet stations shows an annual variation which cannot be explained by the diurnal variation of temperature. The annual variation of temperature at fixed levels in the lower layers of atmosphere shows a trend opposite to these variations at fixed elevations in the middle layers. This fact indicates that the troposphere cannot be regarded as a layer of uniform structure. The interdiurnal variations of pressure and temperature for the individual levels and their opposite trend compel us to postulate within the troposphere a lower layer as has been observed before in various occasions and then called the layer of disturbation. It is possible to generalize these observations and to conceive of the lower layer as a planetary phenomenon and as the ground layer of the atmosphere.
    Abstract: Riassunto Il gradiente termico verticale presenta una variazione annuale che non può venir spiegata con la variazione diurna della temperatura. La variazione annuale della temperatura a livelli determinati nei bassi strati dell'atmosfera rivela un andamento opposto a quello che si riscontra negli strati centrali della troposfera. I due fatti dimostrano che la tropofera non può venir considerata come uno strato avente struttura uniforme. Le variazioni interdiurne della pressione e della temperatura nei singoli strati verticali ed il loro comportamento inverso conducono all'esistenza di uno strato inferiore in seno alla troposfera, già prima occasionalmente osservato e definito strato di perturbazione. Simili osservazioni sono atte a venir generalizzate in quanto questo strato inferiore è concepibile come fenomeno planetärio e come strato base dell'atmosfera.
    Notes: Zusammenfassung Der vertkkale Temperaturgradient hat bei ausgewahlten Stationen einen jährlichen Gang, der nicht durch den täglichen Temperaturgang erklärbar ist. Die jährliche Temperaturschwankung in Abhängigkeit von der Höhe zeigt ein gegenläufiges Verhalten zwischen den unteren und den mittleren Schichten der Troposphäre. Beide Erscheinungen weisen darauthin, dass man die Troposphäre nicht als eine Schicht von einheitlichem Aufbau ansehen kann. Die interdiurnen Anderungen von Druck und Temperatur in den einzelnen Höhenschichten und ihr gegenläufiges Verhalten zwingen dazu eine untere Schicht in der Troposphäre auszusondern, die scho gelegentlich früher beobachtet und dann als Störungsschicht bezeichnet wurde. Diese Beobachtungen sind aber einer Verallgemeinerung fähig, indem diese untere Schicht als planetarische Erscheinung aufzufassen und als Grundschicht der Atmosphäre zu kennzeichnen ist.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 112 (1974), S. 301-319 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Satellite pictures have been utilised to detect mountain waves on the lee of the Andes range. The wavelengths as observed in the pictures from the distribution of clouds in parallel bands lie between 20 and 30 km for the five cases examined. The wavelengths have also been computed theoretically for these cases by an analytical method and a quasi-numerical method, using linearised perturbation equations. Wavelengths so computed are in fairly good agreement with the observed wavelengths, Vertical velocities associated with the waves along the different sectors of the Andes have also been computed. Their maximum values are of the order of 1–5 m sec−1. Also, the quasi-stationary character of the waves, as noticed in some of the pictures, is discussed.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 112 (1974), S. 274-280 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Diabatic heating of the atmosphere at 800, 600 and 400 mbar surfaces over India has been calculated, making use of thermodynamic and quasi-geostrophic omega equations. The numerically obtained distribution of the diabatic heating field is seen to be in agreement with the observed weather patterns in magnitude. The maximum value of diabatic heating is of the order of 4.0 to 4.5 cal gm−1 12 hr−1. Normally it ranges between 1.0 to 4.0 cal gm−1 12 hr−1. The vertical distribution of the absolute mean value of diabatic heating is seen to be at its maximum at about the 500 mbar surface.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 112 (1974), S. 320-330 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary An attempt is made to construct a scheme of numerical integration for the wave operator that can detect which kind of non-homogeneous term has acted over the data and later use this knowledge to integrate the operator in time. Data is generated with a wave initially at rest, and a scheme is presented to detect these functions and study how these values can be extrapolated in time to be used. The use of known functions to generate data is required only to check the effectiveness of the numerical device.
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