Simulation of Seismic Wave Propagation on Asteroid Ryugu Induced by The Impact Experiment of The Hayabusa2 Mission: Limited Mass Transport by Low Yield Strength of Porous Regolith
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- G. Nishiyama
- Department of Earth and Planetary Science The University of Tokyo Tokyo Japan
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- T. Kawamura
- Institut de Physique du Globe de Paris Université de Paris Paris France
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- N. Namiki
- National Astronomical Observatory of Japan Mitaka Japan
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- B. Fernando
- University of Oxford Oxford UK
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- K. Leng
- University of Oxford Oxford UK
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- K. Onodera
- Institut de Physique du Globe de Paris Université de Paris Paris France
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- S. Sugita
- Department of Earth and Planetary Science The University of Tokyo Tokyo Japan
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- T. Saiki
- Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Japan
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- H. Imamura
- Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Japan
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- Y. Takagi
- Aichi Toho University Nagoya Japan
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- H. Yano
- The Graduate University for Advanced Studies SOKENDAI Hayama Japan
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- M. Hayakawa
- Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Japan
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- C. Okamoto
- Kobe University Kobe Japan
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- H. Sawada
- Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Japan
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- Y. Tsuda
- Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Japan
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- K. Ogawa
- Kobe University Kobe Japan
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- S. Nakazawa
- Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Japan
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- Y. Iijima
- Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Japan
書誌事項
- 公開日
- 2021-02
- 資源種別
- journal article
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1029/2020je006594
- 公開者
- American Geophysical Union (AGU)
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説明
<jats:title>Abstract</jats:title><jats:p>Seismic shaking has been regarded as an essential source of resurfacing on asteroids. The Small Carry‐on Impactor (SCI) operation on Hayabusa2 has been expected to be a unique opportunity for testing in situ seismic shaking whose energy is sufficiently large to excite observable surface modification. However, no obvious regolith hopping was identified even immediately outside of the crater formed by the SCI impact. To understand this discrepancy from the expectation, we simulate seismic wave propagation on Ryugu with a wide range of surface material properties and evaluate maximum acceleration on the surface. Numerical results reveal that low‐quality factor or low seismic efficiency is required to explain the lack of geomorphological change after the SCI experiment. Considering that scattering under anhydrous conditions cannot efficiently dissipate energy, such a low‐quality factor is not plausible. The weak yield strength in porous materials can efficiently decrease seismic wave energies, making the apparent seismic efficiency extremely low. Based on this hypothesis, we propose a formulation of surface mobility on asteroids that considers the physical properties of regolith. We consistently estimate the occurrence of seismic shaking with the existence of unstable boulders on Ryugu.</jats:p>
収録刊行物
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- Journal of Geophysical Research: Planets
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Journal of Geophysical Research: Planets 126 (2), 2021-02
American Geophysical Union (AGU)
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詳細情報 詳細情報について
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- CRID
- 1360009142829017600
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- ISSN
- 21699100
- 21699097
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- KAKEN
- OpenAIRE
