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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic equivalence of dipping beds, faults and anticlines (1985)
    Springer
    Pure and applied geophysics 123 (1985), S. 893-901 
    Details
    ISSN: 1420-9136
    Keywords: Magnetic anomalies ; dipping beds ; faults ; anticlines ; magnetic equivalence ; ambiguity in interpretation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The interpretation of magnetic anomalies of dipping beds with an inclined top is ambiguous. The magnetic anomaly profile over a dipping bed can be produced by a series of beds of different dips and directions of magnetization. Further, these anomalies are equivalent to those of faults and anticlines. Thus, the magnetic anomaly profiles, assumed to be produced by one of the models, can also be produced by the other models. The ambiguity is resolved in case of dipping beds and faults, when the magnetization is caused purely by induction; but the case of anticlinal beds remains ambiguous. The magnetic equivalence of dipping beds, anticlines, and faults makes it possible to apply the available methods of interpretation of fault models to dipping beds and anticlines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00876977
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic interpretation of pairs of sheets and their equivalence to dykes (1990)
    Springer
    Pure and applied geophysics 132 (1990), S. 719-731 
    Details
    ISSN: 1420-9136
    Keywords: Magnetic interpretation ; pair of sheets ; equivalence to dykes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Magnetic anomaly profiles over two thin sheets separated by a small distance resemble those of dykes andvice versa. Interpretation of anomalies over a pair of sheets based on the magnetic properties of dykes predicts a dyke whose centre lies midway between the positions of the sheets. The dyke, on the other hand, is magnetically equivalent to a pair of sheets, both lying at the same depth and having the same magnetization. The magnetic anomalies due to a pair of sheets can be interpreted by framing linear equations between the anomalies and their distances measured from an arbitrary reference. Application of this method to anomalies of dipping sheets with a finite depth extent is indicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00876816
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  • 3
    Electronic Resource
    Electronic Resource
    Interpretation of gravity anomalies of dykes by pseudo-magnetic transformation (1969)
    Springer
    Pure and applied geophysics 73 (1969), S. 43-46 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary A simple transformation called pseudo-magnetic transformation is introduced in which the horizontal derivatives of the observed gravity anomalies of any body will be calculated. These horizontal derivatives, called the pseudo-magnetic anomalies, are proportional to the vertical magnetic anomalies of the same body assumed to be polarised horizontally. It is shown that the interpretation of gravity anomalies of dykes is not unique except by computing the pseudo-magnetic anomalies, which will be interpreted by the logarithmic curve fitting technique indicated earlier [5]2).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875120
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic interpretation of dyke anomalies using derivatives (1985)
    Springer
    Pure and applied geophysics 123 (1985), S. 232-238 
    Details
    ISSN: 1420-9136
    Keywords: Magnetic interpretation ; Dykes ; Derivatives
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The horizontal and vertical derivative profiles of magnetic anomalies of dykes show some interesting properties. The points of zero derivatives and the points where the derivatives are equal are conjugate point pairs. A method of interpretation of dyke anomalies is suggested, which utilizes the distances between these points.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877019
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  • 5
    Electronic Resource
    Electronic Resource
    Interpretation of self-potential anomalies of some simple geometric bodies (1970)
    Springer
    Pure and applied geophysics 78 (1970), S. 66-77 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary An entirely new procedure for interpreting selfpotential anomalies of spheres, rods and dipping sheets is presented. The anomaly of a sphere is divided into two parts — the anomaly of odd symmetry and the anomaly of even symmetry — from which the depth can be obtained by fitting them with the master curves. The self-potential anomalies of a finite rod are transformed to the anomalies of a veritcal sheet, for which standard curves are presented. The case of a sheet was divided into three parts; (a) finite line of poles; (b) infinite double line of poles and (c) finite double line of poles. For the first case logarithmic curves were prepared and presented; by their comparison with the field profile, different parameters can be obtained. In the second case, a geometrical construction is provided to obtain the various values. In the third case, the anomalies of finite sheet (finite double line of poles) are transformed into those due to an infinite double line of poles for interpretation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00874774
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  • 6
    Electronic Resource
    Electronic Resource
    The zero-line method of interpreting total field magnetic anomalies of spherical ore-bodies (1978)
    Springer
    Pure and applied geophysics 116 (1978), S. 1191-1199 
    Details
    ISSN: 1420-9136
    Keywords: Magnetic total field anomalies ; Inversion of magnetic anomalies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary A method called the zero-line method for interpreting the total field magnetic anomalies of spherical bodies is described. The contour of zero-anomaly is controlled by a linear equation of the typeAx 2 +By 2 +Cxy +Dx +Ey +F = 0, where the coefficientsA toF are related to the depth of the sphere and the parameters relating to its position and magnetisation. From the coordinates (x, y) of the various points lying on the zero-contour, five normal equations for the above equation are set and solved for the various coefficients. The various parameters relating to the position and magnetisation of the sphere are then determined from these coefficients. It is expected that similar methods can be developed for interpreting magnetic anomalies of other three dimensional bodies also.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00874679
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  • 7
    Electronic Resource
    Electronic Resource
    A simple formula for the second derivative method of interpretation (1970)
    Springer
    Pure and applied geophysics 80 (1970), S. 5-26 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Second derivative coefficients for various grid systems are derived followingPeters' andElkins' approaches. Two simple formulae, one for three dimensional bodies and the other for two dimensional bodies are also suggested. These utilise the average of the anomalies around a single circle and the anomaly at the central point. All the coefficient sets and the proposed simple formulae are applied to gravity fields of spheres and cylinders. Coefficients ofElkins' type derived with a weightage of 1/r 4 to all the circles gave excellent results in both the cases of spheres and cylinders, whereasPeters' coefficients without any weightage to the circles gave reliable results in case of cylinders only. The simple formulae suggested gave more accurate results than any of the above coefficient sets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00880190
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  • 8
    Electronic Resource
    Electronic Resource
    A method for the interpretation of magnetic anomalies of dipping doublets (1970)
    Springer
    Pure and applied geophysics 80 (1970), S. 193-198 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary A simple method for the interpretation of the vertical magnetic anomalies of dipping doublets is presented. In the first step, the line integrals of the anomalies along theX direction, which represent the anomalies of a vertical line double are utilised to obtain the depths to the two poles. In the second step, the profile alongY, through the point of intersection of the doublet with theX axis is used to determine the dip of the dipole.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00880207
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  • 9
    Electronic Resource
    Electronic Resource
    Remanent magnetism of dykes and continental drift (1967)
    Springer
    Pure and applied geophysics 68 (1967), S. 124-130 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The possibility of utilising the results of remaeent magnetism of sub-surface bodies, as obtained from the magnetic surveys, for the study of continental drift is presented. As an example, the quartz-magnetite bands occurring at Ongole, Andhra Pradesh, India have been magnetically surveyed. A modified method for the interpretation of magnetic anomalies of infinite dykes has been presented and is used for the interpretation of field profiles. A remanent magnetic vector with an up dip of 26° lying exactly in the present magnetic meridian has been obtained, which yields the ancient latitude of India (Reference Town being Nagpur) to be 9°S of equator at an age of 1400 million years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00874890
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  • 10
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    Tectonic model for the evolution of oceanic crust in the northeastern Indian Ocean from the Late Cretaceous to the Early Tertiary (1995)
    American Geophysical Union
    Details
    Publication Date: 1995-10-10
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
    Published by American Geophysical Union
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