Comparison Research on Gravity Changes in Indonesia, China and Japan by Employing Superconducting Gravimeters

利用超导重力仪对印度尼西亚、中国和日本重力变化进行对比研究

• 批准号: 10041116
• 负责人: TAKEMOTO Shuzo
• 金额: $ 3.07万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10041116/
• 关键词: superconducting gravimeters; absolute gravimeters; Earth tides; ocean tides; Indonesia; China; island arc; structure of upper mantle

Precise gravity measurements using superconducting gravimeters (SGs) are expected to be an effective measure for detection of very weak signals caused by oscillations in the Earth's fluid core, or long-term gravity changes due to tectonic motions related to seismic and volcanic activities. A global network of SGs was set up by Global Geodynamic Project (GGP), an international program of observations of temporal variations in the Earth's gravity field, under the sponsorship of IUGG and IAG. Data distribution of the network began in 1997. It is of course important to improve global geodynamic studies focused on Earth's deep interior using data of the SG global network. On the other hand, it is desired to investigate regional characteristics of physical properties and structures in crust and upper mantle in East Asia using SG data in Indonesia, China and Japan by means of comparison of loading effects of ocean tides on Earth tide observation in these areas. Kyoto University has carried on … More precise gravity observation using two SGs since 1988. In 1997, we shifted one of the two GSs from Kyoto to Bandung, Indonesia. Since then, SG observation in Bandung has been continued under close cooperation between Kyoto Univ. and Volcanological Survey of Indonesia. In this study, we, Japanese investigators visited Bandung every half a year for maintenance of the SG, and Indonesian investigators visited Kyoto every year to analyze the SG data and to discuss problems on gravity changes in tectonically active regions along island arcs. The head investigator (S. Takemoto) visited the Institute of Geodesy and Geophysics, Chinese Acad. Sci. in Wuhan in November 1999 and discussed with Chinese investigators our cooperative research of geodynamics in East Asia using superconducting gravimeters and absolute gravimeters. We could establish a data set of the superconducting gravimeters in Bandung, Wuhan and Kyoto. As a result of comparison of these data, regional difference of loading effects of ocean tides on Earth tide observation can be indicated. Less

利用超导重力仪（SGs）进行精确的重力测量有望成为一种有效的措施，用于探测由地球流体核心振荡引起的非常微弱的信号，或由地震和火山活动相关的构造运动引起的长期重力变化。全球地球动力学项目（GGP）是由国际重力组织（IUGG）和国际重力组织（IAG）共同发起的地球重力场时间变化观测项目。该网络的数据分发始于1997年。当然，利用SG全球网络的数据，改进以地球深部为重点的全球地球动力学研究是很重要的。另一方面，希望利用印度尼西亚、中国和日本的SG资料，通过比较海潮对东亚地区地球潮汐观测的加载效应，探讨东亚地区地壳和上地幔物理性质和结构的区域特征。京都大学从1988年开始使用两个SGs进行更精确的重力观测。1997年，我们把两个全球总站中的一个从京都搬到了印度尼西亚的万隆。从那时起，在京都大学和印度尼西亚火山调查局的密切合作下，SG在万隆的观测继续进行。在本研究中，我们日本研究人员每半年访问万隆进行SG的维护，印度尼西亚研究人员每年访问京都分析SG数据并讨论沿岛弧构造活动区的重力变化问题。首席研究员（S. Takemoto）访问了中国科学院大地测量与地球物理研究所。1999年11月在武汉与中国研究人员讨论了利用超导重力仪和绝对重力仪进行东亚地球动力学的合作研究。我们可以建立万隆、武汉和京都的超导重力仪数据集。通过对这些资料的比较，可以看出海潮对地球潮汐观测的负荷效应的区域差异。少

项目成果

S.Takemoto: "Precise Gravity Observation in Bandung Using a Superconducting Gravimeter"Proc of the Symposium on Japan-Indonesia IDNDR Projects. 223-230 (1998)

S.Takemoto：“使用超导重力仪在万隆进行精确重力观测”日本-印度尼西亚 IDNDR 项目研讨会的会议记录。

竹本 修三: "超伝導重力計を用いた京都における重力の時間的変化の精密観測(1988〜1997)" 京都大学防災研究所年報. 第41号B-1. 77-85 (1998)

Shuzo Takemoto：“使用超导重力仪精确观察京都重力的时间变化（1988-1997）”京都大学防灾研究所年度报告第 41 B-1 号（1998 年）。