Article Dans Une Revue Science Advances Année : 2024

Seismically detected cratering on Mars: Enhanced recent impact flux?

Ingrid Daubar
Benjamin Fernando
Gareth Collins
Colin Dundas
Natalia Wójcicka
Matthew Golombek
Constantinos Charalambous
Philippe Lognonné
W. Bruce Banerdt

Résumé

Seismic observations of impacts on Mars indicate a higher impact flux than previously measured. Using six confirmed seismic impact detections near the NASA InSight lander and two distant large impacts, we calculate appropriate scalings to compare these rates with lunar-based chronology models. We also update the impact rate from orbital observations using the most recent catalog of new craters on Mars. The snapshot of the current impact rate at Mars recorded seismically is higher than that found using orbital detections alone. The measured rates differ between a factor of 2 and 10, depending on the diameter, although the sample size of seismically detected impacts is small. The close timing of the two largest new impacts found on Mars in the past few decades indicates either a heightened impact rate or a low-probability temporal coincidence, perhaps representing recent fragmentation of a parent body. We conclude that seismic methods of detecting current impacts offer a more complete dataset than orbital imaging.

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Dates et versions

hal-04872580 , version 1 (16-01-2025)

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Ingrid Daubar, Raphaël Garcia, Alexander Stott, Benjamin Fernando, Gareth Collins, et al.. Seismically detected cratering on Mars: Enhanced recent impact flux?. Science Advances , 2024, 10 (26), ⟨10.1126/sciadv.adk7615⟩. ⟨hal-04872580⟩

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