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Studies of lunar seismology are used by scientists, engineers and artists for a number of purposes including: *Learning about the moon's and Earth's evolution *Understanding Earth's seismology with comparative studies *Gaining knowledge about tidal moonquakes or other origins of these forces (since the moon is thought to have no tectonic plates) *Advancing the field of selenography (the geography of the moon) ==History== Several seismographic measuring systems have already been installed on the moon and their data made available to scientists (such as the those from the Apollo Lunar Surface Experiments Package). The existence of moonquakes was an unexpected discovery from seismometers placed on the Moon by Apollo astronauts from 1969 through 1972. The instruments placed by the Apollo 12, 14, 15 and 16 missions were functional until they were switched off in 1977. Moonquakes are not believed to be caused by tectonic plate movement (as earthquakes are), but by tidal forces between Earth and the moon.〔(Apollo 15 Mission. Lunar and Planetary Institute ) Retrieved 2012-02-12.〕 Further data hopes to clarify the origins and effects of the forces causing moonquakes. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lunar seismology」の詳細全文を読む スポンサード リンク
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