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  • 1
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    Component parts of the World Heat Flow Data Collection
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Area/locality; Conductivity, average; Depth, bottom/max; Depth, top/min; ELEVATION; Heat flow; LATITUDE; LONGITUDE; Method comment; Number; Number of conductivity measurements; Number of temperature data; Sample, optional label/labor no
    Type: Dataset
    Format: text/tab-separated-values, 40 data points
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    DATA PANGAEA
  • 2
    Electronic Resource
    Electronic Resource
    Seismic investigations in South West African river beds (1957)
    Springer
    Pure and applied geophysics 37 (1957), S. 35-44 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary In sand-filled river channels in arid parts of South West Africa it is of importance to find methods of locating the rock surface under the sand, for purposes of water supply. This paper describes preliminary investigations in three such river beds, to test the applicability to this problem of the seismic refraction method, using the hammer-electronic seismic instrument previously developed by one of the writers for shallow refraction work. Both the method in general, and the instrument in particular, proved satisfactory. Examples are given of travel-time diagrams, interpretation is discussed, and channel profiles deduced from the work are shown. Depths ranged from a few feet to a few tens of feet. At two of the three sites, variations in velocity in the sand made standard calculations of dip and depth from two-way shooting inapplicable. In such situations depth could still be estimated reasonably reliably near the origin of the traverse. There was evidence of a superficial layer in which the velocity was less than that of sound in air.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01988849
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Stress Near the Surface of the Earth (1987)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Earth and Planetary Sciences 15 (1987), S. 545-566 
    Details
    ISSN: 0084-6597
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ea.15.050187.002553
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Estimation of the magnetic fields of current channels in magnetovariational data (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 96 (1989), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Electric currents induced in the Earth are concentrated, in many places, in rocks of anomalously high conductivity, which may have a locally elongated shape. If the currents in such a current channel close beyond the bounds of an area of observation, such as is provided by an array of magnetometers, we call them channelled currents. The presence of such currents can cause severe problems in the interpretation of magnetovariation fields. To identify current channels, which may carry channelled currents, we construct a data matrix with elements H(j, ω) where j indicates position and spatial component of the magnetovariation field and ω is frequency. If the fields are due to a single current channel, then the data matrix has the form of an outer product and H = uv†, where u is a real vector with components u(j), and v is a complex vector with components v(ω). This corresponds to the case where Re(HH†) has only one non-zero eigenvalue. Consequently the eigenvectors of the matrix Re(HH†) can be used to test for current channels. We also determine estimators for u and v based on a least-squares criterion. These estimators can be used to construct the three components of the magnetic fields of current channels over a two-dimensional surface. The efficacy of the method is illustrated by analysing data from a magnetometer array in western Canada. The analysis shows that the total and internal parts of the magnetovariation fields are dominated by currents in a single channel, whereas the external fields are not. As the current channel crosses the array it very probably carries channelled currents in the sense of this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1989.tb06002.x
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  • 5
    Electronic Resource
    Electronic Resource
    A STUDY OF THE PALAEOMAGNETISM OF THE PILANSBERG DYKES (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 7 (1956), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: iA detailed study has been made of the remanent magnetization of five Pilansberg dykes, by means of measurements on oriented specimens of the rocks. Outcrops of the dykes prove to have suffered magnetic disturbance of their original thermo-remanent magnetization. Specimens from depths of a few thousand feet, taken in Witwatersrand gold mines, show highly consistent magnetisation of the basic parts of the dykes over considerable distances between sampling sites. The mean directions given by the five dykes agree well, and the mean direction from the five dykes gives a North-seeking magnetic pole with inclination +69.3 and azimuth N 24° E. Assuming thermo-remanent magnetisation by a geocentric dipole field, this places a North magnetic pole in latitude 71/2° N, longitude 421/ E at the time of intrusion of the dykes. The age of the dykes is uncertain, but is probably about 300 to 400 million years. Some of the specimens have been subjected to alternating magnetic fields in order to test the stability of their magnetisations. The basic specimens are found to be highly stable, being only slightly affected by fields of 100 to 300 oersteds. The possible implications of the results are discussed, in terms of hypotheses of polar wandering and continental drift.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1956.tb05564.x
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  • 6
    Electronic Resource
    Electronic Resource
    Blackett's Fundamental Theory of the Earth's Magnetic Field (1947)
    [s.l.] : Nature Publishing Group
    Nature 160 (1947), S. 746-746 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SOON after the publication of Prof. P. M. S. Blackett's paper1, Dr. E. C. Bullard suggested to us that it should be possible to test Blackett's theory against other theories by measurements of the magnetic field of the earth in the mines of the Witwaters-rand. By courtesy of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/160746a0
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  • 7
    Electronic Resource
    Electronic Resource
    Mantle upflow under North America and plate dynamics (1984)
    [s.l.] : Nature Publishing Group
    Nature 311 (1984), S. 428-433 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the development of plate dynamics there are two fundamental questions. First, do the plates slide over a passive asthenosphere, or are they driven by a convecting upper mantle? Second, are all ocean ridges passive, pull-apart plate margins, or do some lie above upcurrents in the mantle and in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/311428a0
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  • 8
    Electronic Resource
    Electronic Resource
    A stress province boundary and tractions on the North American plate (1983)
    [s.l.] : Nature Publishing Group
    Nature 305 (1983), S. 619-621 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The orientation of the stress tensor in the Earth's crust within a tectonic plate largely reflects the forces acting on that plate. At depths of 10 km or less one principal stress is usually nearly normal to the Earth's free surface and so nearly vertical. The magnitude of this vertical principal ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/305619a0
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  • 9
    Electronic Resource
    Electronic Resource
    Electrical conductivity and tectonics of Scotland (1977)
    [s.l.] : Nature Publishing Group
    Nature 266 (1977), S. 617-620 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Time-varying magnetic fields associated with induced currents in the solid earth, which may delineate conductive structures, are superposed on the source field due to currents in the magneto-sphere and ionosphere. At the geomagnetic latitude of Scotland, source fields associated with polar ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/266617a0
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  • 10
    Electronic Resource
    Electronic Resource
    An electrical conductivity anomaly and rifting in southern Africa (1975)
    [s.l.] : Nature Publishing Group
    Nature 255 (1975), S. 678-680 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Measurements of electrical conductivity provide information about rifting in eastern and southern Africa. Overall geophysical and geological evidence supports the view that the conductive zone marks an extension of the African Rift system along old weak zones in the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/255678a0
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