Grav mag prism: a matlab/octave program to generate gravity and magnetic anomalies due to rectangular prismatic bodies
Alessandra de Barros e Silva Bongiolo,Jeferson de Souza,Francisco José Fonseca Ferreira,Luís Gustavo de Castro +3 more
- Vol. 31, Iss: 3, pp 347-363
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Palavras-chave et al. as discussed by the authors present the GRAV MAG PRISM code to generate synthetic gravity and magnetic anomalies from rectangular prismatic bodies with arbitrary dimensions, densities and magnetizations.Abstract:
. In this paper we present the GRAV MAG PRISM code to generate synthetic gravity and magnetic anomalies from rectangular prismatic bodies with arbitrary dimensions, densities and magnetizations. The code has been developed in a MATLAB/OCTAVE environment and provides a graphical and a numerical output, as well. The data are written in xyz (ASCII) format and can be contaminated with noise. We also summarize the theory and show some examples of the program’s applications. The code can be used for research and educational purposes and is freely-distributed by the authors on request. Keywords : gravity and magnetic anomalies, potential-field modeling, program. RESUMO . Neste trabalho e apresentado o programa GRAV MAG PRISM, o qual gera anomalias de gravidade e magneticas sinteticas a partir de corpos prismaticos retangulares com dimensoes, densidades e magnetizacoes arbitrarias. O codigo foi desenvolvido em ambiente MATLAB/OCTAVE, com saidas graficas e numericas. Os dados sao escritos no formato xyz (ASCII) e podem ser contaminados por ruidos. Neste trabalho tambem e apresentado um resumo da teoria e alguns exemplos de aplicacao do programa. O codigo acompanha um tutorial e pode ser utilizado para fins educacionais e de pesquisa, sendo de distribuicao gratuita atraves de solicitacao aos autores. Palavras-chave : anomalias gravimetricas e magneticas, modelagem de campos potenciais, programa.read more
Citations
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EdgeDetectPFI: An algorithm for automatic edge detection in potential field anomaly images - application to dike-like magnetic structures
TL;DR: An algorithm to automatically locate the spatial position of anomalies in potential field images, which can be used to estimate the depth and width of causative sources, is proposed and compared with Euler deconvolution.
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Optimizing depth estimates from magnetic anomalies using spatial analysis tools
TL;DR: The tilt-derivative method provides more continuous and higher resolution contact information than the 3D Euler deconvolution technique and demonstrates its reliability to determine depths to magnetic contacts.
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Constraining Euler Deconvolution Solutions Through Combined Tilt Derivative Filters
TL;DR: In this article, a constraining mask based on local phase filters as the tilt derivative and the horizontal tilt derivative (TDX) is proposed to guide the Euler deconvolution moving data window.
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Magnetic interpretation of the Paranaguá Terrane, southern Brazil by signum transform
Jessica Derkacz Weihermann,Francisco José Fonseca Ferreira,Saulo P. Oliveira,Leonardo Fadel Cury,Jeferson de Souza +4 more
TL;DR: In this paper, the authors applied a directional cosine filter to the magnetic data of the Paranagua Terrane, in order to characterize its structural framework and reveal other structures covered by recent quaternary deposits.
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Combining tilt derivative filters: new approaches to enhance magnetic anomalies
TL;DR: Palavras-chave et al. as discussed by the authors extend the concept of two earlier enhancement techniques based on the local phase of the magnetic anomaly, namely the vertical (TDR) and horizontal (TDX) tilt angles, which are defined by the inverse tangent of ratios involving the total horizontal gradient and the vertical derivative.
References
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The analytic signal of two‐dimensional magnetic bodies with polygonal cross‐section: its properties and use for automated anomaly interpretation
TL;DR: In this article, a simple transformation in the frequency domain yields an analytic function whose real part is the horizontal derivative of the field profile and whose imaginary part is vertical derivative of field profile.
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Potential field tilt—a new concept for location of potential field sources
Hugh G. Miller,Vijay Singh +1 more
TL;DR: In this article, the potential field tilt is defined in terms of the ratio of the first vertical derivative of a potential field to the horizontal gradient of the field, which has the property of being positive over a source and negative elsewhere.
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Environmental and engineering geophysics
TL;DR: Geophysical imaging methods provide solutions to a wide range of environmental and engineering problems: protection of soil and groundwater from contamination, disposal of chemical and nuclear waste, geotechnical site testing, landslide and ground subsidence hazard detection, location of archaeological artefacts as discussed by the authors.
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Mapping Basement Magnetization Zones From Aeromagnetic Data In the San Juan Basin, New Mexico
Lindrith Cordell,V. J. S. Grauch +1 more
TL;DR: In this article, two new techniques are employed in analysis of aeromagnetic data from the San Juan basin, New Mexico, to enhance the expression of buried basement structure and lithology: the data are analytically continued downward onto the irregular basement surface in order to reduce the effect of variable depth to basement, and magnetization boundaries are delineated by a linear filter based on the gradient of pseudogravity reduction to the basement.
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Fundamentals of Geophysics
TL;DR: The most popular undergraduate textbook for geophysics is the Geophysics: A Coursebook for Undergraduates as mentioned in this paper, which contains twelve chapters covering the same breadth of topics as earlier editions, but in a substantially modernized fashion to facilitate classroom teaching.
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