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火星上地震检测到的石坑:增强了最近的冲击流量?

Ingrid J Daubar¹, Raphaël F Garcia², Alexander E Stott²

¹Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI 02912, USA.

Science advances

|June 28, 2024

概括

地震数据显示,火星的撞击速度比以前估计的要高. 这表明地震探测方法可以更全面地了解当前的火星撞击事件.

科学领域:

行星科学行星科学
地震学地震学
冲击石坑的形成

背景情况:

以前对火星撞击流量的估计主要依赖于轨道观测.
来自NASA InSight着陆器的地震数据提供了一种用于检测最近冲击的新方法.

研究的目的:

将来自地震数据的撞击率与来自轨道观测的撞击率进行比较.
更新对目前火星撞击流量的理解.

主要方法:

分析了InSight着陆器附近确认的六个地震冲击探测结果.
结合两个遥远的大冲击事件.
更新基于轨道观测的撞击速率与最近的火山口目录.
缩放地震数据以与月球年代模型进行比较.

主要成果:

地震观测表明,与单独的轨道检测相比,火星上的冲击流量更高.
测量的地震冲击率是轨道估计的2到10倍,这取决于冲击器直径.
发生在时间上的两个大撞击表明,撞击速度最近增加了,或者是一个罕见的时间巧合.

结论:

对火星当前冲击的地震探测提供了比单独的轨道成像更完整的数据集.
目前对火星的撞击速度可能比以前理解的要高.
进一步的地震数据对于完善火星撞击时间模型至关重要.

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