来自InSight Sol 1034a撞击事件的大量次要石坑
P M Grindrod1, I J Daubar2, B Fernando3
1Natural History Museum London UK.
概括
火星上的地震事件,由NASA检测到.
科学领域:
- 行星科学 行星科学
- 撞击坑研究 撞击坑研究
- 地震学 地震学
背景情况:
- 撞击坑是太阳系历史上的一个基本过程.
- 由于图像定时差距,观察像二次石坑这样的小规模特征具有挑战性.
- 地震数据为撞击事件提供了精确的时间.
研究的目的:
- 用精确定时的地震事件来调查二次石坑的形成.
- 分析新撞击坑及其相关次要事件的特征.
- 了解二次冲击特征的形成和消失.
主要方法:
- 利用来自NASA的InSight任务的地震事件数据 (S1034a) 来精确确定撞击时间.
- 分析了新撞击坑的轨道图像.
- 量化二次冲击特征 (低白度点) 和它们的分布.
主要成果:
- 确认的地震事件S1034a是由新的撞击坑事件造成的.
- 一个~9米长的原始石坑产生了超过900次的二次撞击事件 (低白色斑点) 距离7公里远.
- 估计二次冲击弹射速度低于200 m/s.
- 低白度斑点在200-300天内消失.
结论:
- 地震数据为研究小规模的二次石坑形成提供了独特的机会.
- 低白度斑点是二次冲击过程的重要指标.
- 火星上的二次撞击特征的可观测寿命相对较短.
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