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Precise Observation of Earth Tides by Employing Superconducting Gravity Meters, Laser Extensometers and Laser Tiltmeters

利用超导重力仪、激光引伸计和激光倾斜仪精确观测地球潮汐

基本信息

批准号：
02640304
负责人：
TAKEMOTO Shuzo
金额：
$ 1.02万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

1. Precise observation of earth tides by employing superconducting gravity me aser extensometers were carried out. Earth tides were analyzed by applying the Bayesian Tidal Analysis Program 'BAYtAP-G' to both gravity and strain data. Results obtained are as follows ;(1)Comparison of two superconducting gravity meters installed on the same base in an observation room at Kyoto University indicated that tidal signals were in excellent agreement in both amplitudes and in phases, but their long-term drifts were inconsistent with each other. This may be mainly due to instrumental noises.(2)A search of tidal strain data from laser extensometers at the Amagase Crustal Movement Observatory, Kyoto, during the period of 32 months revealed no evidence of anomalous changes related to the occurrence of earthquakes.(3)Tidal strains observed with laser extensometers at three observatories(Amagase, Kishu and Rokko-Takao)in Kinki district were compared with theoretically expected ones in which the ocean tidal loading effects calculated for four Earth's models(1066A, G-B, oceanic mantle and shielded mantle models)were included. At the present stage, however, differences between observed and expected tidal strains are too large to be used in discussion to determine what model is suitable for Kinki district.2. A water-tube ti-Itmeter using a laser interferometric device was developed and installed at the Kamigamo Geophysical Observatory, Kyoto. Precise measurement of ground-tilt using this instrument have been carried out since March, 1992.

1.利用超导重力仪伸缩仪对固体潮进行了精密观测。地球潮汐进行了分析，应用贝叶斯潮汐分析程序'BAYtAP-G'的重力和应变数据。结果表明：（1）对安装在京都大学观测室同一基座上的两台超导重力仪的观测结果表明，两台超导重力仪观测到的潮汐信号在振幅和相位上都非常一致，但它们的长期漂移却不一致。这可能主要是由于仪器噪声。(2)A对京都Amagase地壳运动观测站的激光伸缩仪在32个月期间提供的潮汐应变数据进行了研究，没有发现与地震发生有关的异常变化的证据。（3）比较了近畿地区尼濑、纪州和六高尾三个观测站的激光应变仪观测结果与理论计算结果，其中包括1066 A、G-B、大洋地幔和屏蔽地幔四种地球模型的海潮负荷效应。然而，在现阶段，观测到的潮汐应变和预期的潮汐应变之间的差异太大，无法用于讨论确定哪种模型适合于近畿地区。京都上贺茂地球物理观测站研制并安装了一台使用激光干涉仪的水管式ti-Itmeter。自1992年3月以来，利用该仪器进行了地倾斜的精密测量。