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Capability of the penetrator seismometer system for lunar seismic event observation |
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| Authors: | R Yamada I Yamada S Tanaka N Kobayashi Y Ishihara K Yomogida A Fujimura |
| Institution: | a Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan b Department of Earth and Planetary Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan c Research Center for Seismology, Volcanology and Disaster Mitigation, Nagoya University, Chikusa-ku, Nagoya, Aichi 464-8602, Japan d Mitutoyo Corporation, Kawasaki, Kangawa 213-8533, Japan e Department of Earth and Planetary Science, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan f Earthquake Research Institute, University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan g Japan Agency for Marine-Earth Science and Technology, Yokohama, Kanagawa 236-0001, Japan h Department of Applied Science, Faculty of Science, Kochi University, Kochi 780-8520, Japan i Department of Earth and Planetary Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan j Newton Press Inc, Shinjuku-ku, Tokyo 163-0207, Japan |
| Abstract: | We developed a seismometer system for a hard landing “penetrator” probe in the course of the former Japanese LUNAR-A project to deploy new seismic stations on the Moon. The penetrator seismometer system (PSS) consists of two short-period sensor components, a two-axis gimbal mechanism for orientation, and measurement electronics. To carry out seismic observations on the Moon using the penetrator, the seismometer system has to function properly in a lunar environment after a hard landing (impact acceleration of about 8000 G), and requires a signal-to-noise ratio to detect lunar seismic events. We evaluated whether the PSS could satisfactorily observe seismic events on the Moon by investigating the frequency response, noise level, and response to ground motion of our instrument in a simulated lunar environment after a simulated impact test. Our results indicate that the newly developed seismometer system can function properly after impact and is sensitive enough to detect seismic events on the Moon. Using this PSS, new seismic data from the Moon can be obtained during future lunar missions. |
| Keywords: | Seismometer Penetrator Moonquake Lunar exploration Planetary seismology |
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