Other
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p21a1595a&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #P21A-1595
Other
[1221] Geodesy And Gravity / Lunar And Planetary Geodesy And Gravity, [5417] Planetary Sciences: Solid Surface Planets / Gravitational Fields, [5475] Planetary Sciences: Solid Surface Planets / Tectonics
Scientific paper
The spectral relations (admittance and correlation) between gravity and topography are often used to obtain information on the density structure, flexural support and heat flow of planetary lithospheres. Mapping spatial variations in these quantities requires spatio-spectral analysis techniques. Here we describe the application of a fully directional, continuous spherical wavelet transform using a wavelet basis constructed from the superposition of azimuthally-adjacent complex Morlet wavelets, in a manner similar to the `Fan' wavelet developed on the plane. The method is applied to gravity and topography of the terrestrial planets where sufficiently high resolution data are available, including the Moon. The wavelet coefficients are used to compute isotropic and directional wavelet auto- and cross-spectra, which are then combined to form the admittance and correlation functions. The resulting maps offer insights into differences in structure of the lithosphere between planetary bodies. In particular we show that the Earth and Venus have uniformly low admittance and high correlation, whereas Mars and the Moon display large hemispherical contrasts with negative values coinciding with lowlands and most impact basins. On Earth, the highest isotropic and anisotropic admittance values are located on continents, indicating a strong lithosphere compared to oceans basins. On Venus both the admittance and correlation maps are uniform and isotropic at all wavelet degrees. On Mars the northern hemisphere shows highly negative and anisotropic admittance, whereas the Tharsis Rise and major impact basins are mostly isotropic and positive-valued. The near side of the Moon shows large negative admittance and correlation with the highest levels of anisotropy. The far side has uniformly high and isotropic admittance and correlation. We note that the two largest topographically-expressed impact basins in the inner solar system, the South Pole-Aitken basin on the Moon and the Hellas basin on Mars, display positive admittance and correlation, whereas most other impact basins show negative values. These results imply that no simple isostatic model can account for all observations and that future models will need to incorporate anisotropy as an additional parameter.
No associations
LandOfFree
Spherical wavelet analysis of gravity and topography of the terrestrial planets does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Spherical wavelet analysis of gravity and topography of the terrestrial planets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spherical wavelet analysis of gravity and topography of the terrestrial planets will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1495430