An estimate of the impact rate on Mars from statistics of very-high-frequency marsquakes

被引:6
作者
Zenhausern, Geraldine [1 ]
Wojcicka, Natalia [2 ]
Stahler, Simon C. [1 ]
Collins, Gareth S. [2 ]
Daubar, Ingrid J. [3 ]
Knapmeyer, Martin [4 ]
Ceylan, Savas [1 ]
Clinton, John F. [5 ]
Giardini, Domenico [1 ]
机构
[1] Swiss Fed Inst Technol, Inst Geophys, Zurich, Switzerland
[2] Imperial Coll London, Dept Earth Sci & Engn, London, England
[3] Brown Univ, Earth Environm & Planetary Sci, Providence, RI 02912 USA
[4] DLR Inst Planetary Res, Berlin, Germany
[5] Swiss Fed Inst Technol, Swiss Seismol Serv, Zurich, Switzerland
关键词
INSIGHT LANDING SITE; CRATERING RATE;
D O I
10.1038/s41550-024-02301-z
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The number density of impact craters on a planetary surface is used to determine its age, which requires a model for the production rate of craters of different sizes. On Mars, however, estimates of the production rate of small craters (<60 m) from orbital imagery and from extrapolation of lunar impact data do not match. Here we provide a new independent estimate of the impact rate by analysing the seismic events recorded by the seismometer onboard NASA's InSight lander. Some previously confirmed seismically detected impacts are part of a larger class of marsquakes (very high frequency, VF). Although a non-impact origin cannot be definitively excluded for each VF event, we show that the VF class as a whole is plausibly caused by meteorite impacts. We use an empirical scaling relationship to convert between seismic moment and crater diameter. Applying area and time corrections to derive a global impact rate, we find that 280-360 craters >8 m diameter are formed globally per year, consistent with previously published chronology model rates and above the rates derived from freshly imaged craters. Our work shows that seismology is an effective tool for determining meteoroid impact rates and complements other methods such as orbital imaging.
引用
收藏
页码:1138 / 1147
页数:14
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