Abstract
Although scale invariance is a basic geodynamic symmetry, there is no reason to expect it to be isotropic; that the corresponding fractals or multifractal fields be self-similar. The analysis of various geophysical fields has indeed shown that although they are typically scaling multifractals, they are indeed anisotropic involving differential rotation, stratification and more complex scale changes. The framework for the analysis and simulation of such fields is generalized scale invariance (GSI), which comprises two elements — the generator and the unit ball. Although the generator is more fundamental, the shape of the possibly highly anisotropie unit ball will also affect the texture and morphology of the corresponding fields. While full nonlinear GSI is difficult to examine, linear approximations are always valid over finite ranges of scale; we will therefore focus on the latter. Building on earlier work using linear GSI and second order (convex/elliptical) balls, we establish a method of constructing higher order families necessary for modeling qualitatively different morphologies, especially non-convex ones. We illustrate the method using fourth order polynomials and multifractal simulations.
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Pecknold, S., Lovejoy, S., Schertzer, D. (1997). The Morphology and Texture of Anisotropic Multifractals Using Generalized Scale Invariance. In: Molchanov, S.A., Woyczynski, W.A. (eds) Stochastic Models in Geosystems. The IMA Volumes in Mathematics and its Applications, vol 85. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-8500-4_14
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DOI: https://doi.org/10.1007/978-1-4613-8500-4_14
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