Effect of underground water on gravity observation at Matsushiro, Japan
The short-term effect of underground water on superconducting gravimeter observation at Matsushiro, Japan is investigated. Analysis of rainfall data as well as gravity data reveals that observed gravity decreases immediately after rainfall by the amount which can be explained by a Bouguer model. Thi...
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| Veröffentlicht in: | Journal of geodynamics 2006-01, Vol.41 (1), p.221-226 |
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| container_title | Journal of geodynamics |
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| creator | Imanishi, Y. Kokubo, K. Tatehata, H. |
| description | The short-term effect of underground water on superconducting gravimeter observation at Matsushiro, Japan is investigated. Analysis of rainfall data as well as gravity data reveals that observed gravity decreases immediately after rainfall by the amount which can be explained by a Bouguer model. This suggests that Newtonian attraction by the mass of water above the gravimeter supplied by rainfall is the dominant part of the effect of underground water. Gravity excursion due to rainfall decays linearly with time, suggesting the existence of a physical mechanism involving percolation, evaporation or drainage of water at a steady rate. A simple numerical model is introduced to calculate the gravity effect based on rainfall data. The model is shown to reproduce the observed gravity changes well. |
| doi_str_mv | 10.1016/j.jog.2005.08.031 |
| format | Article |
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Analysis of rainfall data as well as gravity data reveals that observed gravity decreases immediately after rainfall by the amount which can be explained by a Bouguer model. This suggests that Newtonian attraction by the mass of water above the gravimeter supplied by rainfall is the dominant part of the effect of underground water. Gravity excursion due to rainfall decays linearly with time, suggesting the existence of a physical mechanism involving percolation, evaporation or drainage of water at a steady rate. A simple numerical model is introduced to calculate the gravity effect based on rainfall data. 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Analysis of rainfall data as well as gravity data reveals that observed gravity decreases immediately after rainfall by the amount which can be explained by a Bouguer model. This suggests that Newtonian attraction by the mass of water above the gravimeter supplied by rainfall is the dominant part of the effect of underground water. Gravity excursion due to rainfall decays linearly with time, suggesting the existence of a physical mechanism involving percolation, evaporation or drainage of water at a steady rate. A simple numerical model is introduced to calculate the gravity effect based on rainfall data. 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Analysis of rainfall data as well as gravity data reveals that observed gravity decreases immediately after rainfall by the amount which can be explained by a Bouguer model. This suggests that Newtonian attraction by the mass of water above the gravimeter supplied by rainfall is the dominant part of the effect of underground water. Gravity excursion due to rainfall decays linearly with time, suggesting the existence of a physical mechanism involving percolation, evaporation or drainage of water at a steady rate. A simple numerical model is introduced to calculate the gravity effect based on rainfall data. The model is shown to reproduce the observed gravity changes well.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.jog.2005.08.031</doi><tpages>6</tpages></addata></record> |
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| ispartof | Journal of geodynamics, 2006-01, Vol.41 (1), p.221-226 |
| issn | 0264-3707 |
| language | eng |
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| subjects | Bouguer model Hydrological effect Superconducting gravimeter Underground water |
| title | Effect of underground water on gravity observation at Matsushiro, Japan |
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