Global and local isostatic coherence from the wavelet transform
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 co...
| Main Authors: | , |
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| Format: | Journal Article |
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American Geophysical Union
2004
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| Online Access: | http://hdl.handle.net/20.500.11937/29817 |
| _version_ | 1848752908434145280 |
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| author | Kirby, Jonathan Swain, Christopher |
| author_facet | Kirby, Jonathan Swain, Christopher |
| author_sort | Kirby, Jonathan |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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 appliedthe 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. |
| first_indexed | 2025-11-14T08:16:06Z |
| format | Journal Article |
| id | curtin-20.500.11937-29817 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:16:06Z |
| publishDate | 2004 |
| publisher | American Geophysical Union |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-298172019-02-19T04:27:41Z Global and local isostatic coherence from the wavelet transform Kirby, Jonathan Swain, Christopher elastic thickness Rheology continental tectonics wavelets lithosphere mantle 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 appliedthe 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. 2004 Journal Article http://hdl.handle.net/20.500.11937/29817 10.1029/2004GL021569 American Geophysical Union fulltext |
| spellingShingle | elastic thickness Rheology continental tectonics wavelets lithosphere mantle Kirby, Jonathan Swain, Christopher Global and local isostatic coherence from the wavelet transform |
| title | Global and local isostatic coherence from the wavelet transform |
| title_full | Global and local isostatic coherence from the wavelet transform |
| title_fullStr | Global and local isostatic coherence from the wavelet transform |
| title_full_unstemmed | Global and local isostatic coherence from the wavelet transform |
| title_short | Global and local isostatic coherence from the wavelet transform |
| title_sort | global and local isostatic coherence from the wavelet transform |
| topic | elastic thickness Rheology continental tectonics wavelets lithosphere mantle |
| url | http://hdl.handle.net/20.500.11937/29817 |