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| Titel |
Recovering the effective elastic thickness, Te, of oceanic lithosphere in the presence of long wavelength topography |
| VerfasserIn |
L. M. Kalnins, A. B. Watts |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250042452
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| Zusammenfassung |
| We have developed a moving window admittance technique to determine the relationship
between free-air gravity anomaly and bathymetry as a function of wavelength over the
world’s ocean basins and their margins. Preliminary results from the western Pacific
Ocean show that the technique resolves the effective elastic thickness of the oceanic
lithosphere, Te, to better than ±5 km for Te < 30 km over horizontal distances of a
few tens of km. In this paper, we investigate the robustness of our results using
different tapering schemes (e.g. single versus multitaper) and synthetic tests that
illustrate our ability to recover Te in the region of long wavelength features such as
trench outer rises, mid-plate swells and mid-ocean ridges. By investigating observed
admittances in the Pacific, Indian, and Atlantic Oceans, we have found that there is a
“critical wavelength” that separates the relatively short wavelength contributions of
lithospheric flexure to the gravity field from longer wavelength effects such as those
associated with mantle dynamics. We examine here this “critical wavelength” and its
implications for swell compensation depths, plate cooling models, and mantle convection. |
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