The effect of ‘noise’ on estimates of the elastic thickness of the continental lithosphere by the coherence method
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 expone...
| Main Authors: | , |
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| Format: | Journal Article |
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American Geophysical Union
2003
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| Online Access: | http://hdl.handle.net/20.500.11937/46201 |
| _version_ | 1848757492761231360 |
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| author | Swain, Christopher Kirby, Jonathan |
| author_facet | Swain, Christopher Kirby, Jonathan |
| author_sort | Swain, Christopher |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T09:28:58Z |
| format | Journal Article |
| id | curtin-20.500.11937-46201 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:28:58Z |
| publishDate | 2003 |
| publisher | American Geophysical Union |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-462012019-02-19T04:27:34Z The effect of ‘noise’ on estimates of the elastic thickness of the continental lithosphere by the coherence method Swain, Christopher Kirby, Jonathan elastic thickness lithosphere rheology mantle crust Continental tectonics 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. 2003 Journal Article http://hdl.handle.net/20.500.11937/46201 10.1029/2003GL017070 American Geophysical Union fulltext |
| spellingShingle | elastic thickness lithosphere rheology mantle crust Continental tectonics Swain, Christopher Kirby, Jonathan The effect of ‘noise’ on estimates of the elastic thickness of the continental lithosphere by the coherence method |
| title | The effect of ‘noise’ on estimates of the elastic thickness of the continental lithosphere by the coherence method |
| title_full | The effect of ‘noise’ on estimates of the elastic thickness of the continental lithosphere by the coherence method |
| title_fullStr | The effect of ‘noise’ on estimates of the elastic thickness of the continental lithosphere by the coherence method |
| title_full_unstemmed | The effect of ‘noise’ on estimates of the elastic thickness of the continental lithosphere by the coherence method |
| title_short | The effect of ‘noise’ on estimates of the elastic thickness of the continental lithosphere by the coherence method |
| title_sort | effect of ‘noise’ on estimates of the elastic thickness of the continental lithosphere by the coherence method |
| topic | elastic thickness lithosphere rheology mantle crust Continental tectonics |
| url | http://hdl.handle.net/20.500.11937/46201 |