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    The effect of ‘noise’ on estimates of the elastic thickness of the continental lithosphere by the coherence method

    117386_4007_Swain_GRL_03a.pdf (229.5Kb)
    Access Status
    Open access
    Authors
    Swain, Christopher
    Kirby, Jonathan
    Date
    2003
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Swain, Christopher and Kirby, Jonathan. 2003. The effect of 'noise' on estimates of the elastic thickness of the continental lithosphere by the coherence method. Geophysical Research Letters. 30 (11): pp. 1574-1578.
    Source Title
    Geophysical Research Letters
    DOI
    10.1029/2003GL017070
    ISSN
    00948276
    Faculty
    Department of Spatial Sciences
    Faculty of Science and Engineering
    The Western Australian School of Mines
    Remarks

    Copyright © 2003 American Geophysical Union.

    Publisher's Citation: Swain, C. J., and J. F. Kirby (2003), The effect of ‘noise’ on estimates of the elastic thickness of the continental lithosphere by the coherence method, Geophysical Research Letters, Vol. 30 (11), 1574, doi: 10.1029/2003GL017070.

    URI
    http://hdl.handle.net/20.500.11937/46201
    Collection
    • Curtin Research Publications
    Abstract

    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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