Research on Dynamics of Earth's Deep Interior by Employing a Superconducting Gravimeter Network in Northern and Southern Hemispheres

利用北半球和南半球超导重力计网络研究地球深处的动力学

• 批准号: 09440158
• 负责人: TAKEMOTO Shuzo
• 金额: $ 10.11万
• 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: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09440158/
• 关键词: Gravimeter; superconducting gravimeter; gravity changes; Core-under-tone; fluid core; ocean tides; Dynamics of Earth's deep interior; polar motion

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 regional tectonic movements. 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. With regard to the global network of SGs, our research group has contributed to extend the network in northern and southern hemispheres. Nowadays, we have carried on SG observations in Esashi, Matsushiro, Kyoto, Aso, Syowa (Antarctica), Canberra (Australia), Bandung (Indoesia) and Ny-Alesund (Norway). During recent three years, we observed fluid core resonance in diurnal tidal bands, long-period gravity changes related to the polar motion, as well as incessant excitation of the Earth's free oscillations. Furthermore, simultaneous observations of SGs and FG-5 Absolute Gravimeters detected the loading effects of ocean tides.

利用超导重力仪(SGS)进行精确的重力测量有望成为探测由地球流体核心振荡引起的非常微弱的信号或区域构造运动引起的长期重力变化的有效手段。在IUGG和IAG的赞助下，全球地球动力学计划(GGP)建立了一个全球SGS网络。GGP是一个观测地球重力场时间变化的国际计划。该网络的数据分发始于1997年。关于SGS的全球网络，我们的研究小组为将该网络扩展到南北半球做出了贡献。目前，我们已经在Esashi、Matsushiro、京都、Aso、Syowa(南极洲)、堪培拉(澳大利亚)、万隆(印度支那)和NY-Alesund(挪威)进行了SG观测。近三年来，我们观测到了潮汐带的液核共振、与极移有关的长周期重力变化以及地球自由振荡的持续激发。此外，SGS和FG-5绝对重力仪的同时观测发现了海潮的负荷效应。

项目成果

Y.Imanishi: "Global superconducting gravimeter Observations and the search for the translational modes of the inner core"Phys. Earth Planet.Int. 117,1. 3-10 (2000)

Y.Imanishi：“全球超导重力仪观测和对内核平移模式的探索”Phys。

S.Takemoto: "Precise Gravity Observation in Bandung Using a Superconducting Gravimeter" Proc.of the Symposium on Japan-Indonesia IDNDR Projects. 223-230 (1999)

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。

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：“使用超导重力计在万隆进行精确重力观测”Proc。

Sato T., et al.: "Polar motion effect on gravity observed with a superconducting gravimeter at Syowa Station,Antarctica" International Association of Geodesy Symposia Gravity,Geoid and Geodesy. Vol.117. 99, 104 (1997)

Sato T.等人：“在南极洲昭和站用超导重力仪观测到的极地运动对重力的影响”国际大地测量协会重力、大地水准面和大地测量学研讨会。

Takemoto,S., et al.: "Effects of Ground Vibrations on Absolute Gravity Measurement in Kyoto" International Association of Geodesy Symposia Gravity,Geoid and Geodesy. Vol.117. 69, 74 (1997)

Takemoto,S. 等人：“京都地面振动对绝对重力测量的影响”国际大地测量协会重力、大地水准面和大地测量学研讨会。