Journal ArticleDOI
The historical development of the magnetic method in exploration
Misac N. Nabighian,V.J.S. Grauch,R. O. Hansen,Thomas R. LaFehr,Yaoguo Li,J. W. Peirce,Jeffrey D. Phillips,M. E. Ruder +7 more
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TLDR
The magnetic method is the primary exploration tool in the search for minerals, oil and gas, geothermal resources, and groundwater, and for a variety of other purposes such as natural hazards assessment, mapping impact structures, and engineering and environmental studies as discussed by the authors.Abstract:
The magnetic method, perhaps the oldest of geophysical exploration techniques, blossomed after the advent of airborne surveys in World War II. With improvements in instrumentation, navigation, and platform compensation, it is now possible to map the entire crustal section at a variety of scales, from strongly magnetic basement at regional scale to weakly magnetic sedimentary contacts at local scale. Methods of data filtering, display, and interpretation have also advanced, especially with the availability of low-cost, high-performance personal computers and color raster graphics. The magnetic method is the primary exploration tool in the search for minerals. In other arenas, the magnetic method has evolved from its sole use for mapping basement structure to include a wide range of new applications, such as locating intrasedimentary faults, defining subtle lithologic contacts, mapping salt domes in weakly magnetic sediments, and better defining targets through 3D inversion. These new applications have increased the method’s utility in all realms of exploration — in the search for minerals, oil and gas, geothermal resources, and groundwater, and for a variety of other purposes such as natural hazards assessment, mapping impact structures, and engineering and environmental studies.read more
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Journal ArticleDOI
Advancing process‐based watershed hydrological research using near‐surface geophysics: A vision for, and review of, electrical and magnetic geophysical methods
David A. Robinson,Andrew Binley,N. Crook,Frederick D. Day-Lewis,Ty P. A. Ferré,V. J. S. Grauch,Rosemary Knight,Michael D. Knoll,Venkat Lakshmi,Richard D. Miller,Jonathan E. Nyquist,L. Pellerin,Kamini Singha,Lee Slater +13 more
TL;DR: The paper identifies instruments, provides examples of their use, and describes how synergy between measurement and modelling could be achieved, and provides a vision for the use of electrical and magnetic geophysical instrumentation in watershed scale hydrology.
Journal ArticleDOI
Interpretation of magnetic data using tilt-angle derivatives
TL;DR: In this paper, a new method for interpretation of gridded magnetic data is proposed based on derivatives of the tilt angle, which provides a simple linear equation, similar to the 3D Euler equation.
Journal ArticleDOI
Locating and quantifying geological uncertainty in three-dimensional models: Analysis of the Gippsland Basin, southeastern Australia
TL;DR: In this article, the uncertainty introduced by geological orientation data was examined by producing a suite of implicit 3D models generated from orientation measurements subjected to uncertainty simulations and the resulting uncertainty associated with different regions of the geological model can be located, quantified and visualised, providing a useful method to assess model reliability.
Book
Near-Surface Applied Geophysics
TL;DR: In this article, the authors explore the foundations of interpretation theory and the latest developments in near-surface techniques, used to complement traditional geophysical methods for deep-exploration targets, including magnetics, resistivity, seismic reflection and refraction, surface waves, induced polarization, selfpotential, electromagnetic induction, ground-penetrating radar, magnetic resonance, interferometry, seismoelectric and more.
Journal ArticleDOI
The Magnetic Field of the Earth’s Lithosphere
TL;DR: In this paper, the authors review the difficulties encountered in measuring, extracting, interpreting and even defining the magnetic field of the Earth's lithosphere, and illustrate the lessons learned in measuring and processing Earth's magnetic field data may prove fruitful in planetary exploration.
References
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Book
Potential theory in gravity and magnetic applications
TL;DR: In this article, the potential of the geomagnetic field has been studied in vector calculus, and the results of the potential have been shown to be equivalent to the conversion of units.
Journal ArticleDOI
Statistical models for interpreting aeromagnetic data
A. Spector,F. S. Grant +1 more
TL;DR: In this article, a mathematical basis for the application of power spectrum analysis to aeromagnetic map interpretation is developed and an ensemble of blocks of varying depth, width, thickness, and magnetization is considered as a statistical model.