First observations of free oscillations of the earth from Indian superconducting gravimeter in Himalaya
First observations of free oscillations of the earth from Indian superconducting gravimeter in Himalaya
复制标题
印度超导重力仪在喜马拉雅山首次观测到地球的自由振荡
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
V. Choubey
中科院分区：
文献类型：
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作者：
B. Arora;Kamal;Amit Kumar;Gautam Rawat;Naresh Kumar;V. Choubey
印度第一台超导重力仪于2007年3月安装在位于喜马拉雅山脉靠近印度北阿坎德古图主中央冲断层的瓦迪亚喜马拉雅地质研究所多参数地球物理观测台。安装后，几乎立即在SG上很好地记录了所罗门群岛地震（M = 8.1）后激发的自由振荡。在本研究中估计了其中几种振荡的频率和振幅，并与早期的全球观测结果进行了比较。这些结果与使用地震仪和SG的全球数据集进行的类似研究一致。本研究验证了记录数据的质量，以搜索分钟（次微）同震/大地震的重力信号，并为该国未来的低频地震学研究奠定了基础。文中还讨论了SG数据的一些新的应用。
The first Indian superconducting gravimeter (SG) was installed in March 2007 at the Multi-Parametric Geophysical Observatory of the Wadia Institute of Himalayan Geology, in the Himalaya near the Main Central Thrust at Ghuttu, Uttarakhand, India. Almost immediately after installation, the free oscillations excited after the Solomon Islands earthquake (M = 8.1) were well recorded on the SG. The frequency and amplitude of several of these oscillations have been estimated in the present study and compared with the earlier global observations. The results are in tandem with similar studies carried out using a global dataset from the seismometers and SG. The present study validates the quality of the recorded data to search minute (submicrogal) coseismic/precursory gravity signals to large earthquakes and sets the background for future low-frequency seismological research in the country. Some new applications of SG data are also discussed.