Boulder stranding in ejecta launched by an impact generated seismic pulse
Boulder stranding in ejecta launched by an impact generated seismic pulse
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DOI：
10.1016/j.icarus.2019.113424
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发表时间：
2018-12
期刊：
影响因子：
3.2
通讯作者：
E. Wright;A. Quillen;Juliana South;R. Nelson;Diego Paul Sánchez Lana;L. Martini;S. Schwartz;M. Nakajima;E. Asphaug
中科院分区：
文献类型：
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作者：
E. Wright;A. Quillen;Juliana South;R. Nelson;Diego Paul Sánchez Lana;L. Martini;S. Schwartz;M. Nakajima;E. Asphaug
我们考虑如何影响产生的地震脉冲影响的小行星的表面远离撞击现场。通过对多分散砾石混合物的实验室实验，我们跟踪了由单个向上传播的压力脉冲从表面喷射的颗粒的轨迹。高速视频图像显示，喷出物的轨迹与颗粒大小无关，碰撞主要发生在着陆时。当它们着陆时，颗粒被弹道分选，正如Shinbrot等人（2017）所提出的那样，在表面上留下较大的颗粒，较小的颗粒分散得更广。一个单一的强脉冲可以使以前埋在地下的巨石搁浅在地表上。撞击激发的地震脉冲造成的巨石搁浅是一种额外的机制，可能会在碎石小行星表面留下大的巨石，如162173 Ryugu，101955 Bennu和25143 Itokawa。
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.