Elastic properties of lunar regolith from vertical seismic profiling

T. Tsuji, T. Kobayashi, S. Aoki, H. Kanamori, T. Aizawa, T. Matsuoka

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

2 被引用数 (Scopus)

抄録

To reveal shallow subsurface structures as well as velocity distribution of the lunar regolith layer, we propose a survey of Reverse Vertical Seismic Profiling (RVSP) under a program of SELENE-2. In the RVSP experiment, seismic sources generated within the borehole are recorded by receivers deployed on the Moon surface. In Lunar Soil Mechanics (LSM) Investigation System, drilling operations and shear strength measurements (1 m in total depth) are planned for the regolith layer. We attach a vibrator at the shear experiment devices and generate an active source signal within the borehole. MEMS sensors are further attached at legs of the lander and record the wavefields derived from the vibrator within the borehole. Here we show the effectiveness of RVSP survey using the proposed simple (small-size) acquisition system from simulation study and laboratory experiments. First, we conducted simulation study for the designed survey geometry in order to determine the survey parameters (e.g., source signal). This simulation study demonstrates that the source signal should contain high-frequency components in order to resolve shallow velocity structure from short offset data (less than 3m). Since the high-frequency signal is much attenuated, we used a sweep waveform for the source signal. To examine the ability of the sweep waveform for the high-attenuation regolith layer, we conducted small-scale RVSP experiments in laboratory using lunar soil simulant. The laboratory experiments demonstrated that the seismic signal can be retrieved by cross-correlation between source (sweep) waveform and recorded waveform. From the direct P-waves and reflected waveforms observed on the processed gathers, P-wave velocity of the regolith was estimated as ∼85m/s. This study shows that the proposed simple RVSP survey could reveal the shallow subsurface structures as well as velocity within the regolith layer.

本文言語英語
ホスト出版物のタイトルEarth and Space 2012 - Proceedings of the 13th ASCE Aerospace Division Conference and the 5th NASA/ASCE Workshop on Granular Materials in Space Exploration
出版社American Society of Civil Engineers (ASCE)
ページ84-93
ページ数10
ISBN(印刷版)9780784412190
DOI
出版ステータス出版済み - 1 1 2012
外部発表はい
イベント13th Biennial ASCE Aerospace Division International Conference on Engineering, Science, Construction, and Operations in Challenging Environments, Earth and Space 2012 and the 5th NASA/ASCE Workshop on Granular Materials in Space Exploration - Pasadena, CA, 米国
継続期間: 4 15 20124 18 2012

出版物シリーズ

名前Earth and Space 2012 - Proceedings of the 13th ASCE Aerospace Division Conference and the 5th NASA/ASCE Workshop on Granular Materials in Space Exploration

その他

その他13th Biennial ASCE Aerospace Division International Conference on Engineering, Science, Construction, and Operations in Challenging Environments, Earth and Space 2012 and the 5th NASA/ASCE Workshop on Granular Materials in Space Exploration
国/地域米国
CityPasadena, CA
Period4/15/124/18/12

All Science Journal Classification (ASJC) codes

  • 土木構造工学
  • 環境工学
  • 建築および建設

フィンガープリント

「Elastic properties of lunar regolith from vertical seismic profiling」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル