Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3124608k&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 24, CiteID L24608
Physics
9
Geodesy And Gravity: Rheology Of The Lithosphere And Mantle (8160), Tectonophysics: Continental Tectonics-General (0905), Tectonophysics: Rheology-Crust And Lithosphere
Scientific paper
A method to compute the variations in lithospheric elastic thickness (Te) has been developed, using the wavelet transform. The technique, which uses a superposition of two-dimensional Morlet wavelets in a geometry named a `fan' wavelet, is designed to yield isotropic yet complex wavelet coefficients for the co- and cross-spectra of gravity and topography data. These are then used to compute a spatially-varying, isostatic coherence, from which both global and local estimates may be obtained. We applied the method to synthetic gravity and topography generated for a thin elastic plate of uniform thickness 20 km, yielding an apparent, spatially variable Te of 24.5 +/- 3.5 km. The estimated global coherence for this model appears to fit the theoretical prediction as well as Fourier transform-based estimates, and is smoother than these. We also computed the wavelet coherence, and hence spatially-varying Te, for a plate of non-uniform thickness, yielding a difference with the model of -2.0 +/- 1.7 km.
Kirby J. F.
Swain Christopher J.
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