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Posiolova, L. V.; Lognonné, P.; Banerdt, W. B.; Clinton, J.; Collins, G. S.; Kawamura, T.; Ceylan, S.; Daubar, I. J.; Fernando, B.; Froment, M.; Giardini, D.; Malin, M. C.; Miljković, K.; Stähler, S. C.; Xu, Z.; Banks, M. E.; Beucler, É.; Cantor, B. A.; Charalambous, C.; Dahmen, N.; Davis, P.; Drilleau, M.; Dundas, C. M.; Durán, C.; Euchner, F.; Garcia, R. F.; Golombek, M.; Horleston, A.; Keegan, C.; Khan, A.; Kim, D.; Larmat, C.; Lorenz, R.; Margerin, L.; Menina, S.; Panning, M.; Pardo, C.; Perrin, C.; Pike, W. T.; Plasman, M.; Rajšić, A.; Rolland, L.; Rougier, E.; Speth, G.; Spiga, A.; Stott, A.; Susko, D.; Teanby, N. A.; Valeh, A.; Werynski, A.; Wójcicka, N.; Zenhäusern, G.
Science, 10/2022, Volume: 378, Issue: 6618Journal Article
Two >130-meter-diameter impact craters formed on Mars during the later half of 2021. These are the two largest fresh impact craters discovered by the Mars Reconnaissance Orbiter since operations started 16 years ago. The impacts created two of the largest seismic events (magnitudes greater than 4) recorded by InSight during its 3-year mission. The combination of orbital imagery and seismic ground motion enables the investigation of subsurface and atmospheric energy partitioning of the impact process on a planet with a thin atmosphere and the first direct test of martian deep-interior seismic models with known event distances. The impact at 35°N excavated blocks of water ice, which is the lowest latitude at which ice has been directly observed on Mars. An insightful impact On 24 December 2021, the seismometer for the InSight mission on Mars detected a large seismic event with a distinct signature. Posiolova et al . discovered that the event was caused by a meteor impact on the surface of Mars, which was confirmed by satellite observations of a newly formed 150-meter crater. The surface nature and size of the impact allowed Kim et al . to detect surface waves from the event, which have yet to be observed on Mars. These surface waves help to untangle the structure of the Martian crust, which has various amounts of volcanic and sedimentary rock, along with subsurface ice, in different regions of the planet (see the Perspective by Yang and Chen). The characteristics of the impact itself are important because they provide a seismic fingerprint of an impact event that is different from the marsquakes observed so far. —BG A new crater formed on the surface of Mars was detected with the seismometer on the InSight mission.
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