Results 211 to 220 of about 7,525 (257)
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Hybrid modelling of gravity, gravity gradients and magnetic fields
Geophysical Prospecting, 2011ABSTRACTModern geophysical interpretation requires an interdisciplinary approach and software capable of handling multiple geophysical data types such as seismic, full tensor gravity gradiometry, magnetics and magnetotellurics. We use the IGMAS+ (Interactive Gravity and Magnetic Application System) geo‐modelling software that is designed for 3D gravity,
S. Schmidt +3 more
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Gravity and magnetic modelling of the Hikurangi Plateau
Marine Geology, 1994Abstract Gravity modelling of the Hikurangi Plateau, east of North Island, New Zealand, indicates the crust thickens from about 10 km in the north to about 15 km adjacent to the Chatham Rise. It appears to thicken by a lesser amount to the west, towards the Hikurangi Trough.
Bryan Davy, Ray Wood
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Comparison of magnetic and gravity terrain models
Exploration Geophysics, 1989Modelling of magnetic terrain and comparison with actual data is an efficient method for assessing large sets when residual anomalies are important. The technique of Blakely (1981) which utilises a rapidly converging series of Fast Fourier Transforms is an efficient and sufficiently accurate method for this assessment.The technique has been applied to ...
J.P. Williams, V.J.S. Grauch
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Invariant models in the inversion of gravity and magnetic fields and their derivatives
Journal of Applied Geophysics, 2014Abstract In potential field inversion problems we usually solve underdetermined systems and realistic solutions may be obtained by introducing a depth-weighting function in the objective function. The choice of the exponent of such power-law is crucial.
IALONGO S. +2 more
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Magnetic and gravity model of the Morokweng impact structure
Journal of Applied Geophysics, 2002The geophysical characteristics of the 145-Ma-old Morokweng impact structure in South Africa have been studied by modeling combined gravity and magnetic data along a 100-km cross section. Rock physical properties to guide the modeling were measured on samples from three drill cores in the central part of the structure. Based on the resultant model, the
Henkel, Herbert +2 more
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Efficient 3D Gravity and Magnetic Modeling
EGM 2010 International Workshop, 2010There are many different spatial-domain algorithms for 3D gravity and magnetic forward and inverse modeling. However, an efficient modeling tool for petroleum exploration needs algorithms in the wavenumber domain. We have developed, tested and applied such a tool, for both forward and inverse modeling, over two decades.
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Computer modeling in gravity and magnetic interpretation
Geophysics, 1978Abstract Computation of anomalous gravity and magnetic fields generated by various models is a necessary step if techniques of curve-matching are to be used for quantitative interpretation of potential field data. Recently developed methods show that anomalous magnetic and gravity fields are completely determined by the divergence of ...
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Application of three-dimensional interactive modeling in gravity and magnetics
Geophysics, 1988Abstract Three-dimensional (3-D) interactive modeling permits integrated processing and interpretation of gravity and magnetic data, yielding an improved geologic interpretation. 3-D model bodies are constructed from polyhedra of suitable geometry and physical parameters (density and susceptibility), input on an interactive graphics ...
H. J. Goetze, Bernd Lahmeyer
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Geotechnical magnetic–similitude–gravity model testing method
International Journal of Physical Modelling in Geotechnics, 2019Physical modelling under the gravitational field between 0 and ng plays a key role in both terrestrial- and aerospace-geotechnical engineering. A geotechnical magnetic–similitude–gravity model testing (GMMT) method is newly proposed to provide an alternative approach to the current physical modelling methods.
Ruilin Li +4 more
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Magnetic and Gravity Modelling of the Renison Tin Mine, Tasmania
Exploration Geophysics, 1997Tin mineralisation occurs at Renison Bell, near Zeehan in Tasmania, as a group of cassiterite-bearing massive pyrrhotite bodies in Cambrian sedimentary rocks. Mineralising fluids from the underlying Pine Hill Granite have replaced carbonate rocks with massive sulphides and cassiterite.
S. S. J. Roberts, S. T. Mudge
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