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Interpretation methods for magnetometer arrays
Author(s) -
Gough D. I.,
Ingham M. R.
Publication year - 1983
Publication title -
reviews of geophysics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 8.087
H-Index - 156
eISSN - 1944-9208
pISSN - 8755-1209
DOI - 10.1029/rg021i004p00805
Subject(s) - transfer function , inversion (geology) , fourier transform , geophysics , magnetometer , computer science , current (fluid) , field (mathematics) , section (typography) , geology , algorithm , physics , magnetic field , mathematical analysis , mathematics , engineering , seismology , oceanography , quantum mechanics , pure mathematics , electrical engineering , tectonics , operating system
In recent years, interpretation methods for magnetometer array studies have developed sufficiently to justify a review. Such studies investigate structure in the earth to depths of about 600 km using induction by various external current systems, which are briefly described. The use of magnetograms and Fourier transform anomaly maps for identification and location of induced currents is discussed. Characteristics of various types of anomalies are considered. This is followed by a discussion of the separation of time‐varying fields into external and internal parts by the use of surface integration. A section on transfer function analysis includes single‐station transfer functions and complete solutions of the induction matrix with various methods of estimation of the normal field. We next discuss representations of transfer functions by means of induction arrows, hypothetical event analysis, and Z/H pseudosections. Some conditions for stability of transfer functions are defined. Methods of one‐dimensional modeling and inversion are followed by a discussion of four methods of numerical modeling of two‐dimensional structures. Current channeling is considered briefly, and the paper ends with a short section on numerical and analogue modeling methods for three‐dimensional conductive structures.