The Lunar Surface Gravimeter as a Lunar Seismograph
The Lunar Surface Gravimeter as a Lunar Seismograph
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作为月球地震仪的月球表面重力仪
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
A. Hagermann
中科院分区：
文献类型：
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作者：
T. Kawamura;Yasuyuki Saito;Satoshi Tanaka;S. Ono;K. Horai;A. Hagermann
简介：阿波罗17号上的月球表面重力仪（LSG）的主要目标是寻找引力波，但未能探测到引力波[1]。当仪器被部署在月球上时，传感器光束无法在适当的平衡位置平衡。因此，一次总付额无法按照最初的设计发挥作用。Lauderdale和Eichelman（1974）[1]得出结论，“没有规定向国家空间科学数据中心提供实验数据。然而，据Giganti等人（1977）[2]报道，虽然他们没有探测到引力波，但经过一系列的重新配置，光束被重新定位，LSG收集了有用的数据。除了观测引力波外，LSG还被设计用于观测地震信号和潮汐变形[3]。根据Giganti等（1977）[2]的研究，LSG的灵敏度覆盖了1~ 16 Hz的频率范围（图1）。有几种类型的月震报告，深月震，陨石撞击，和高频月震（HFT）。已知每个月震的共振频率约为1Hz，此外，HFT的主要频率约为10 Hz [4]。因此，LSG很可能是在探测月球上的地震事件。然而，LSG数据还没有从地震学的角度进行分析。
Introduction: The primary objective for the Lunar Surface Gravimeter (LSG) on Apollo 17 was to search for gravitational waves, but it failed in detecting them [1]. When the instrument was deployed on the Moon, the sensor beam could not be balanced in the proper equilibrium position. Consequently, the LSG was not able to function as originally designed. Lauderdale and Eichelman (1974) [1] concluded that “no provision has been made to supply data from the experiment to the National Space Science Data Center.” However, it was reported in Giganti et al. (1977) [2] that though they had not detected gravitational waves, after a series of reconfigurations the beam was recentered and the LSG gathered useful data. Besides the observation of gravitational waves, the LSG was also designed to observe seismic signals and tidal deformations [3]. According to Giganti et al. (1977) [2] LSG’s sensitivity covered the frequency range from 1~16Hz (Fig.1). There are several types of moonquakes reported, deep moonquakes, meteorite impacts, and high frequency teleseismic (HFT). Each of the moonquakes is known to have a resonant frequency around 1Hz and in addition, HFT has a predominant frequency around 10 Hz [4]. Therefore it is likely that the LSG was detecting the seismic events on the Moon. However, the LSG data have not been analyzed from a seismological point of view.