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  • 1
    Electronic Resource
    Electronic Resource
    Transient analysis of seismic core phases (1962)
    Springer
    Pure and applied geophysics 52 (1962), S. 41-52 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Magnetbandaufzeichnungen von Erdbebensignalen können, mit vervielfachter Geschwindigkeit wiedergegeben, mittels eines elektronischen Schallspektrographen analysiert werden. Das zeitabhängige Raumwellenspektrum, das man aus einer solchen Analyse nichtstationärer Vorgänge erhält, gibt einen gewissen Einblick in die physikalischen Eigenschaften des Erdinnern. So wurde im kurzperiodischen Anteil der Raumwellen, die durch den äusseren und inneren Erdkern gelaufen sind, Dispersion beobachtet. BeiP′ wurde im Periodenbereich zwischen 1 und 2 Sekunden ein Gruppengeschwindigkeitsmaximum gefunden. Der direkte StrahlP′ und die einmal an der Erdoberfläche reflektiertePP-Welle transportieren mehr Energie als die WellenphasenP′ 2 undPcPP′, die erstens in den äusseren Erdkern unter einem sehr grossen Inzidenzwinkel eindringen und zweitens eine längere Zeit benötigen, um den äusseren Teil des flüssigkeitsähnlichen Kerns zu durchlaufen.
    Notes: Summary Speeded-up magnetic tape recordings of earthquake signals can be analyzed by means of an electronic sound spectrograph. The time-dependent spectrum of body waves obtained through transient analysis provides some insight into the physical properties of the earth's interior. In the short-period arrivals traveling through the outer core and inner core dispersion has been observed. A group velocity maximum has been found forP′ at periods between 1 and 2 seconds. The direct rayP′and the surface reflected phasePP convey more energy than the arrivalsP′ 2 andPcPP′ which, firstly, enter the outer core at incidence far from vertical, and secondly spend more time in the outer part of the fluid core.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01995998
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Velocity of the Seismic Waves Lg and Rg across Australia (1957)
    [s.l.] : Nature Publishing Group
    Nature 180 (1957), S. 495-495 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The ' 'International Seismological Summary" lists seven Australian earthquakes well recorded overseas, namely, the two Western Australian ones of August 16, 1929, and April 29, 1941, and the five Central Australian ones of December 20, 1937, April 17, 1938, March 26, 1939, May 4, 1941, and June 27, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/180495a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    ON TAKING MEANS OF DENSITY DISTRIBUTIONS IN THE EARTH (1957)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 7 (1957), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Summary. The error is investigated when the mean of two solutions of a non-linear second-order differential equation which gives the variation of density with depth in certain layers of the Earth is used as a solution.A solution (Model M) of the equation for layer E is given, which has a density of 9.385 g/m3 at the top of layer E.Identifying, at the top of layer E, the mean of two numerically estimated solutions with a similarly estimated solution, it is shown that the error is a maximum at the bottom of layer E, where it is of the order of 0.04 per cent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1957.tb02892.x
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  • 4
    Electronic Resource
    Electronic Resource
    EARTH MODELS WITH CONTINUOUS DENSITY DISTRIBUTION (1957)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 7 (1957), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Summary. Eight different Earth models have been set up, all with the property that the density p varies continuously from just below the crust to the centre. The distributions of the pressure p, gravity g, incompressibility k and rigidity are also given; and values of a parameter equal to (k/p)dp/dp, indicate the deviations from (chemical) homogeneity in the lower mantle and outer core. The models are designed to provide a numerical background towards testing the view that there is no density jump between the Earth's mantle and core.A discussion shows that this view is difficult to reconcile with a homogeneous core unless an implausibly low value is assumed for the density just below the crust.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1957.tb02891.x
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  • 5
    Electronic Resource
    Electronic Resource
    EARTH MODELS WITH CHEMICALLY HOMOGENEOUS CORES (1957)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 7 (1957), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Summary. The range of possible density distributions in the mantle of the Earth has been examined assuming a chemically homogeneous core. A discussion of various Earth models with homogeneous cores shows that the range is relatively small in the upper part of the mantle. For a density near the surface between 2.8 and 4.0 g/cm3, the density at 1000 km is between 4.1 and 4.8 g/cm3, and at 2000 km is between 5.2 and 6.5 g/cm3.Graphs showing the distributions of density, gravity, pressure, and elastic parameters in two fairly extreme models are given. The first model has a density jump at the core boundary of 4.2 g/cm3 and only slight heterogeneity in D. The second has a continuous density distribution throughout the Earth and large heterogeneity in D.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1957.tb02893.x
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  • 6
    Electronic Resource
    Electronic Resource
    Joint statistical determination of fault-plane parameters
    Amsterdam : Elsevier
    Physics of the Earth and Planetary Interiors 30 (1982), S. 178-184 
    Details
    ISSN: 0031-9201
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9201(82)90105-4
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  • 7
    Electronic Resource
    Electronic Resource
    Group Analysis of Variance for Earthquake Location and Magnitude (1968)
    [s.l.] : Nature Publishing Group
    Nature 217 (1968), S. 47-48 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Consider I seismic regions and J seismological stations. Arrange the measurements under study into a two-way layout in which the "i, j cell" contains the measurements from region i (i = 1, 2, ... I) at station j (.j = 1, 2, ... J). For simplicity, suppose that no cell is empty. (Approximate methods ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/217047a0
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