An Attempt to Estimate Load Green's Function from Gravity Changes Induced by Atmospheric Loading.
スポンサーリンク
概要
- 論文の詳細を見る
In recent years, continuous observations of gravity with time have been achieved by employing superconducting gravity meters with long-term stability and high precision. As a result, even small gravity changes associated with atmospheric loading are now detectable. It is, therefore, possible to obtain information about the structure of the earth from signals caused by atmospheric loading. An attempt to estimate a load Green's function for gravity was performed using the gravity changes associated with time-varying atmospheric pressure loads. Model parameters corresponding to discrete load Green's functions were, at first, estimated by applying the conventional least squares method, but those absolute values were too large to be acceptable. A similar estimation by applying the non-negative least squares method was then performed. As a result, one parameter obtained for the nearest region was fairly well consistent with the theoretically predicted one. However, the other parameters could not be determined. The cause of such a result may be noises included in gravity changes associated with atmospheric pressure variations. It was found by a numerical experiment that reduction of noises to the level of about 10-5 pgal would be needed to estimate the parameters precisely. But it is practically impossible to reduce the noise to that level. Thus, reduction of noises such as the influence of underground water which will be a major source of observational noise and a potent method of inversion are required for the improvement of the result. The present method can be employed to estimate ocean response to atmospheric pressure variations. Furthermore, it is possible to apply the present attempt to a case of oceanic loading, if the change of sea level is accurately determined.
- 日本測地学会の論文
日本測地学会 | 論文
- 月衝突盆地補償メカニズムの比較研究
- 重力異常に基づく糸魚川 - 静岡構造線北部の構造解析
- 台湾・竹崎観測室で観測された非等方性潮汐歪
- 電波無反射室におけるGPS測量用アンテナの位相特性の測定(続報)
- 4way ドップラー計測のロック判定方法と軌道上での検証