A New Crater Near InSight: Implications for Seismic Impact Detectability on Mars
MetadataShow full item record
Funding and Sponsorship
A new 1.5 m diameter impact crater was discovered on Mars only ~40 km from the InSight lander. Context camera images constrained its formation between 21 February and 6 April 2019; follow-up High Resolution Imaging Science Experiment images resolved the crater. During this time period, three seismic events were identified in InSight data. We derive expected seismic signal characteristics and use them to evaluate each of the seismic events. However, none of them can definitively be associated with this source. Atmospheric perturbations are generally expected to be generated during impacts; however, in this case, no signal could be identified as related to the known impact. Using scaling relationships based on the terrestrial and lunar analogs and numerical modeling, we predict the amplitude, peak frequency, and duration of the seismic signal that would have emanated from this impact. The predicted amplitude falls near the lowest levels of the measured seismometer noise for the predicted frequency. Hence, it is not surprising this impact event was not positively identified in the seismic data. Finding this crater was a lucky event as its formation this close to InSight has a probability of only ~0.2, and the odds of capturing it in before and after images are extremely low. We revisit impact-seismic discriminators in light of real experience with a seismometer on the Martian surface. Using measured noise of the instrument, we revise our previous prediction of seismic impact detections downward, from ~a few to tens, to just ~2 per Earth year, still with an order of magnitude uncertainty.
Showing items related by title, author, creator and subject.
Daubar, I.; Lognonné, P.; Teanby, N.; Miljkovic, Katarina; Stevanovic, J.; Vaubaillon, J.; Kenda, B.; Kawamura, T.; Clinton, J.; Lucas, A.; Drilleau, M.; Yana, C.; Collins, G.; Banfield, D.; Golombek, M.; Kedar, S.; Schmerr, N.; Garcia, R.; Rodriguez, S.; Gudkova, T.; May, S.; Banks, M.; Maki, J.; Sansom, E.; Karakostas, F.; Panning, M.; Fuji, N.; Wookey, J.; van Driel, M.; Lemmon, M.; Ansan, V.; Böse, M.; Stähler, S.; Kanamori, H.; Richardson, J.; Smrekar, S.; Banerdt, W. (2018)Impact investigations will be an important aspect of the InSight mission. One of the scientific goals of the mission is a measurement of the current impact rate at Mars. Impacts will additionally inform the major goal of ...
Garcia, R.F.; Daubar, I.J.; Beucler, É.; Posiolova, L.V.; Collins, G.S.; Lognonné, P.; Rolland, L.; Xu, Z.; Wójcicka, N.; Spiga, A.; Fernando, B.; Speth, G.; Martire, L.; Rajšić, Andrea; Miljković, Katarina ; Sansom, Eleanor ; Charalambous, C.; Ceylan, S.; Menina, S.; Margerin, L.; Lapeyre, R.; Neidhart, Tanja; Teanby, N.A.; Schmerr, N.C.; Bonnin, M.; Froment, M.; Clinton, J.F.; Karatekin, O.; Stähler, S.C.; Dahmen, N.L.; Durán, C.; Horleston, A.; Kawamura, T.; Plasman, M.; Zenhäusern, G.; Giardini, D.; Panning, M.; Malin, M.; Banerdt, W.B. (2022)Meteoroid impacts shape planetary surfaces by forming new craters and alter atmospheric composition. During atmospheric entry and impact on the ground, meteoroids excite transient acoustic and seismic waves. However, new ...
Wójcicka, N.; Collins, G.S.; Bastow, I.D.; Teanby, N.A.; Miljkovic, Katarina ; Rajšić, Andrea ; Daubar, I.; Lognonné, P. (2020)Since landing in late 2018, the InSight lander has been recording seismic signals on the surface of Mars. Despite nominal prelanding estimates of one to three meteorite impacts detected per Earth year, none have yet been ...