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用时间成像量化月球上的火山口产量和规质翻转
Emerson J Speyerer1, Reinhold Z Povilaitis1, Mark S Robinson1
1Arizona State University, School of Earth and Space Exploration, Tempe, Arizona 85287, USA.
Nature
|October 14, 2016
概括
新的月球坑的形成速度比以前想象的要快, 这项研究量化了当代石坑的形成速度,并揭示了岩石表面撞击过程的新细节.
科学领域:
- 星球科学
- 地质学
- 遥感技术
背景情况:
- 撞击坑对于行星表面的测年至关重要.
- 之前的月球坑形成率和过程模型是基于有限的数据.
研究的目的:
- 量化月球上的当前火山口产量.
- 调查撞击引起的喷射和二次石坑的过程.
- 改进月球表面演变的模型.
主要方法:
- 使用月球侦察轨道卫星摄像机 (LROC) 狭角摄像机 (NAC) 的时间图像对.
- 分析了"前后"图像以检测新的撞击坑.
- 量化了火山口的大小和分布, 并分析了喷射模式.
主要成果:
- 检测到222个新的撞击坑 (直径≥10米).
- 观测到的石坑比标准的诺库姆函数预测的多了33%.
- 发现了表面喷射的证据和快速的规石流过程 (81,000年时间表).
结论:
- 目前的月球坑率高于此前的估计.
- 撞击引发的喷射和二次坑道显著影响了月球规质.
- 这些发现需要对月球表面年龄模型和规律动态进行修订.
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