By Renata Dmowska, Barry Saltzman
Advances in Geophysics, Vol. forty systematically compares the various at the moment used statistical ways to time sequence research and modeling to guage every one method's robustness and alertness to geophysical datasets. This quantity tackles the age-old challenge of ways to guage the relative roles of deterministic as opposed to stochastic tactics (signal vs noise) of their observations. The booklet introduces the basics in sections titled "1.2 what's a Time sequence? " and "1.3 How is a Time sequence Quantified?", prior to diving into Spectral research, Semivariograms, Rescaled-Range research and Wavelet research. the second one half the publication applies their self-affine research to a couple of geophysical time sequence (historical temperature files, drought possibility review, sedimentation within the context of hydrocarbon bearing strata, variability of the Earth's magnetic field).This quantity explores intimately one of many major parts of noise, that of long-range patience or reminiscence. the 1st bankruptcy is a large precis of conception and methods of long-range endurance in time sequence; the second one bankruptcy is the appliance of long-range endurance to quite a few geophysical time sequence.
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Additional resources for Long-Range Persistence in Geophysical Time Series
A detailed comparison of fractional Gaussian noises and fractional Brownian motions using the Fourier ﬁltering technique and the method of successive random additions has been given by Gallant et al. Ž1994.. These authors also considered a third method of generating synthetic fractional noises using Weierstrass ᎐Mandelbrot functions. Other relevant studies include those carried out by Li and McLeod Ž1986. and Osborne and Provenzale Ž1989.. 4. Semivariograms Using the deﬁnition for the semivariogram, ␥ k , given in Eq.
The variance converges to a ﬁnite value for large N when ␤ - 1, but diverges to inﬁnity as N ª ϱ when ␤ ) 1. The value ␤ s 1 is a natural crossover between weak and strong persistence in a self-afﬁne Žlong-range persistent . time series. ; 32 BRUCE D. MALAMUD AND DONALD L. TURCOTTE FIG. 8. The variance, VN , Eq. , of a time series, yn , is plotted as a function of the length of record, N, for values of ␤ in the range y1 F ␤ - 1 and 1 - ␤ F 3. As N gets larger the variance quickly converges for values of ␤ - 1 and diverges for ␤ ) 1.
For 1 F ␤ F 3. , and squares Ž3 F ␤ F 5. are explained in Table I. Quite good agreement is found in the range 1 F ␤ F 3, where the fractional Brownian motions are expected to be self-afﬁne fractals. From Fig. 17, it is seen that Ha f 0 for fractional Gaussian noises in the range y1 F ␤ F 1. From Eq. , n ; n H a, one can conclude that, in this range of ␤ , the standard deviation, n , and thus the variance, Vn , are independent of the length of the signal, n. Therefore, these fractional noises are Žweakly.