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Potential anomalieson a sphere:Applications to thethickness of thelunar crust M. A. WieczorekR. J. Phillips1998 год

Potential anomalies on a sphere: Applications to the thickness of the lunar crust
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Аннотация: A new technique for calculating potential anomalies on a sphere due to finite amplitude relief has been developed. We show that by raising the topography to the nth power and expanding this field into spherical harmonics, potential anomalies due to topography on spherical density interfaces can be computed to arbitrary precision. Using a filter for downward continuing the Bouguer anomaly, we have computed a variety of crustal thickness maps for the Moon, assuming both a homogeneous as well as a dual‐layered crust. The crustal thickness maps for the homogeneous model give plausible results, but this model is not consistent with the seismic data, petrologic evidence, and geoid to topography ratios, all of which suggest some form of crustal stratification. Several dual‐layered models were investigated, and it was found that only models with both upper and lower crustal thickness variations could satisfy the gravity and topography data. These models predict that the entire upper crust has been excavated beneath the major nearside multiring basins. Additionally, significant amounts of lower crustal material was excavated from these basins, especially beneath Crisium. This model also predicts that mantle material should not have been excavated during the South‐Pole Aitken basin forming event, and that lower crustal material should be exposed at the surface in this basin.
Год издания: 1998
Авторы: M. A. Wieczorek, R. J. Phillips
Издательство: American Geophysical Union
Источник: Journal of Geophysical Research Atmospheres
Ключевые слова: Planetary Science and Exploration, Astro and Planetary Science, Geology and Paleoclimatology Research
Другие ссылки: Journal of Geophysical Research Atmospheres (PDF)
Journal of Geophysical Research Atmospheres (HTML)
HAL (Le Centre pour la Communication Scientifique Directe) (PDF)
HAL (Le Centre pour la Communication Scientifique Directe) (HTML)
HAL (Le Centre pour la Communication Scientifique Directe) (HTML)
HAL (Le Centre pour la Communication Scientifique Directe) (HTML)