The effect of `noise' on estimates of the elastic thickness of the continental lithosphere by the coherence method

Details The effect of `noise' on estimates of the elastic thickness of the continental lithosphere by the coherence method The effect of `noise' on estimates of the elastic thickness of the continental lithosphere by the coherence method

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30k..28s&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 11, pp. 28-1, CiteID 1574, DOI 10.1029/2003GL017070

Physics

13

Tectonophysics: Continental Tectonics-General (0905), Tectonophysics: Rheology-Crust And Lithosphere, Geodesy And Gravity: Rheology Of The Lithosphere And Mantle (8160)

Scientific paper

We model the lithosphere as a uniform elastic plate overlying an inviscid fluid and loaded with both surface and subsurface fractal loads to generate synthetic topography and gravity data. To simulate data having low (topographic) signal to (gravity) noise ratio we use an algebraically larger exponent for the subsurface load in the spectral synthesis fractal algorithm.The gravity power spectrum then decays less rapidly than that of topography, the spectra resembling those for central Australia. We find that the coherence method using multitaper spectral estimation yields significant underestimates of plate thickness for both low and normal signal-to-noise ratio data, unless the data window is larger than several times the true flexural wavelength. We quantify this bias for the parameters used here and apply it as a correction to an effective elastic thickness estimate for central Australia, obtaining a value of 115 +/- 25 km.

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