| タイトル | Information theory lateral density distribution for Earth inferred from global gravity field |
| 本文（外部サイト） | http://hdl.handle.net/2060/19820011857 |
| 著者（英） | Rubincam, D. P. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 1981-10-01 |
| 言語 | eng |
| 内容記述 | Information Theory Inference, better known as the Maximum Entropy Method, was used to infer the lateral density distribution inside the Earth. The approach assumed that the Earth consists of indistinguishable Maxwell-Boltzmann particles populating infinitesimal volume elements, and followed the standard methods of statistical mechanics (maximizing the entropy function). The GEM 10B spherical harmonic gravity field coefficients, complete to degree and order 36, were used as constraints on the lateral density distribution. The spherically symmetric part of the density distribution was assumed to be known. The lateral density variation was assumed to be small compared to the spherically symmetric part. The resulting information theory density distribution for the cases of no crust removed, 30 km of compensated crust removed, and 30 km of uncompensated crust removed all gave broad density anomalies extending deep into the mantle, but with the density contrasts being the greatest towards the surface (typically + or 0.004 g cm 3 in the first two cases and + or - 0.04 g cm 3 in the third). None of the density distributions resemble classical organized convection cells. The information theory approach may have use in choosing Standard Earth Models, but, the inclusion of seismic data into the approach appears difficult. |
| NASA分類 | GEOPHYSICS |
| レポートNO | 82N19731
NASA-TM-83825 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/166750 |
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