Graham Heinson, Jon Kirby, Kent Inverarity, Katherine Stoate, Tania Dhu Frome AEM Survey Data Interpretation Workshop Wednesday 30 th November 2011 Mawson.

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Graham Heinson, Jon Kirby, Kent Inverarity, Katherine Stoate, Tania Dhu Frome AEM Survey Data Interpretation Workshop Wednesday 30 th November 2011 Mawson Laboratories, University of Adelaide, Adelaide SA 5001 The Fractal Dimension of the Frome AEM Data

40-60 m Conductivity slice

“We show here that electromagnetic responses are fractal signals, reflecting a very rough distribution of electrical conductivity. Apparent conductivity profiles across a floodplain and a fractured sandstone aquifer both show that the fractal properties of the surface response depend on the complexity of the causative geological structure.”

Sandstones (heterogeneous) have greater slopes of power spectra than (well sorted) alluvial sediments

Many physical and geophysical phenomena are fractal in nature, such as topography and gravity field. These data have spectra with a power-law decay |k| - , where |k| =  k x 2 + k y 2 The slope of the power spectra is related to the fractal dimension by  = 8 - 2FD (or FD = 4-  /2)

Wavelet Transform

Wavelet transform enables a ‘‘power spectrum’’ to be calculated at each and every location of a specified signal, i.e., power as a function of space and frequency Fourier power spectrum, yields power as a function only of frequency - spatial information has been lost Wavelets use localised basis functions, rather than infinitely repeating sines and cosines. Wavelet transform of a signal,g(x,y) is computed from the convolution of the signal with the complex conjugate of a wavelet,  (x,y)

Australian DEM (a), and its scalograms at 21 km scale, for (b) DoG, (c) Fan, (d) Halo, (e) Morlet, (f) Paul, (g) Perrier, and (h) Poisson wavelets. Grey-scale for scalograms is log10(power), from high (light) to low (dark) power.

What information is contained in the Frome AEM data set? Preliminary study looked at the m conductivity slice Gridded at km squares Can wavelet analysis indicate variability in power and fractal scaling?

DoG Wavelet Scalogram Power contained in wavelet

40-60 m Conductivity Slice DoG Wavelet at 10 km scale

DoGFanHalo Morlet PerrierPoisson m Conductivity Slice

Fractal dimension indicates spatial correlation

Conclusion Why might is be worth this analysis? – Power-spectra indicate localised change, edges – Differences between homogenous and heterogeneous Earth – Fractal dimension indicates spatial self similarity over different scale lengths (correlation with wavelengths) – Potentially link fractal dimension with geology (fractures, lithology, stratigraphy, groundwater, etc)