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Precise Observation of the Secular-Gravity Changes by means of the combination of Absolute and Superconducting Gravimeters.

结合绝对重力仪和超导重力仪精确观测长期重力变化。

基本信息

批准号：
11440132
负责人：
FUKUDA Yoichi
金额：
$ 4.86万
依托单位：
KYOTO NUNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11440132/
关键词：
Absolute Gravimeter Superconducting Grayimeter Precise Grayimetry Satellite Gravity Mission CHAMP GRACE Gravity Variation Variation of the Earth 精密重力計測定

项目摘要

To obtain so accurate data sets of gravity variations as to be used for the comparison with the satellite gravity data such as GRACE, we studied practical methods to combine superconducting and absolute gravity measurements as well as to improve the accuracies of the individual measurements.For this purpose, we have continued superconducting gravity observations at the observation stations of Kyoto, Esashi, Matsushiro in Japan and Bandung in Indonesia. We also started groundwater measurements to reveal their gravity effects at Kyoto and Bandung stations: The results show a clear correlation between the groundwater variations and the gravity observations, especially at the Bandung station. We confirmed that the accuracy of the gravity measurements are improved by removing the groundwater effects.We carried out several absolute gravity measurements in parallel with the superconducting observations at the Esashi and Matsusiro stations in 2000 and 2001 as well as the Kyoto stations where absolute measurements are periodically conducted. The total observation, time in both stations exceeded more than one month which is long enough for purpose of comparison. Moreover, we developed a new method for the data processing, we finally obtained very precise calibration factors for the superconducting gravimeters. We also determined reference gravity values for future studies of secular gravity changes at the stations.To maintain the accurate absolute gravity measurements, adjustments and validations are very important. We carried out the comparison between the absolute gravity meters in collaboration with Geographical Survey Institute. The comparison also contributed to accumulate the know how of the absolute gravity measurements.In addition to the actual measurements, we also conducted several simulation studies of satellite gravity mission data and ground base measurements, and we established the basic techniques of future utilization of those data sets.

为了获得精确的重力变化数据集，以便与GRACE等卫星重力数据进行比较，我们研究了超导和绝对重力测量相结合的实用方法，并提高了单个测量的精度。为此，我们在日本京都、越城、松城和印度尼西亚万隆的观测站继续进行超导重力观测。我们还在京都站和万隆站开始了地下水测量，以揭示它们的重力效应。结果表明，地下水变化与重力观测之间存在明显的相关性，特别是在万隆站。我们证实，消除地下水的影响后，重力测量的精度得到了提高。我们在2000年和2001年分别在Esashi站和Matsusiro站以及定期进行绝对测量的京都站进行了几次与超导观测同时进行的绝对重力测量。两个站点的总观测时间超过一个月，足够进行比较。此外，我们还开发了一种新的数据处理方法，最终得到了超导重力仪非常精确的定标因子。我们还确定了参考重力值，以便将来研究台站的长期重力变化。为了保持绝对重力测量的准确性，调整和验证是非常重要的。我们与地理调查所合作进行了绝对重力仪的比较。这种比较也有助于积累绝对重力测量的知识。除了实际测量外，我们还对卫星重力任务数据和地面测量数据进行了多次模拟研究，并建立了未来利用这些数据集的基本技术。