期刊
ICARUS
卷 337, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.icarus.2019.113424
关键词
-
资金
- Simons Foundation
- NASA [80NSSC18K0226, 80NSSC17K0771, NNX15AI46G]
- National Science Foundation [PHY-1757062]
- Complex Systems and Space, Environment, Risk and Resilience Academies of the Initiative d'EXcellence Joint, Excellent, and Dynamic Initiative (IDEX JEDI) of the Universite Cote d'Azur
- NASA [806784, NNX15AI46G] Funding Source: Federal RePORTER
We consider how an impact generated seismic pulse affects the surface of an asteroid distant from the impact site. With laboratory experiments on dry polydisperse gravel mixtures, we track the trajectories of particles ejected from the surface by a single strong upward propagating pressure pulse. High speed video images show that ejecta trajectories are independent of particle size, and collisions primarily take place upon landing. When they land particles are ballistically sorted, as proposed by Shinbrot et al. (2017), leaving larger particles on the surface and smaller particles more widely dispersed. A single strong pulse can leave previously buried boulders stranded on the surface. Boulder stranding due to an impact excited seismic pulse is an additional mechanism that could leave large boulders present on the surface of rubble asteroids such as 162173 Ryugu, 101955 Bennu and 25143 Itokawa.
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