Paper No. 46-5
Presentation Time: 2:40 PM
SEISMOLOGICAL LOCATION AND ORBITAL IMAGING OF NEWLY FORMED CRATERS ON MARS (Invited Presentation)
GARCIA, Raphael1, DAUBAR, Ingrid2, BEUCLER, Éric3, POSIOLOVA, L.4, COLLINS, Gareth S.5, LOGNONNÉ, Philippe6, ROLLAND, Lucie7, XU, Zongbo8, WÓJCICKA, Natalia9, SPIGA, Aymeric10, FERNANDO, Benjamin11, SPETH, Gunnar4, MARTIRE, Léo6, RAJŠIĆ, Andrea12, MILJKOVIC, K.13, SANSOM, Eleanor13, CHARALAMBOUS, Constantinos14, CEYLAN, Savas15, MENINA, Sabrina8, MARGERIN, Ludovic16, LAPEYRE, Rémi17, NEIDHART, Tanja13, TEANBY, N.18, SCHMERR, Nicholas19, BONNIN, Mickaël3, FROMENT, Marouchka8, CLINTON, J.20, KARATEKIN, Ozgur21, STÄHLER, Simon C.15, DAHMEN, Nikolaj15, DURÁN, Cecilia15, HORLESTON, Anna22, KAWAMURA, Taichi23, PLASMAN, Matthieu23, ZENHÄUSERN, Géraldine20, GIARDINI, Domenico15, PANNING, Mark6, MALIN, Michael C.24 and BANERDT, W. Bruce6, (1)ISAE-SUPAERO, Université de Toulouse, Toulouse, 31400, France, (2)Brown University, Providence, RI 02878, (3)Nantes Université, Nantes, F-44000, France, (4)MSSS, San Diego, CA 91909, (5)Imperial College London, London, SW7 2BP, United Kingdom, (6)Jet Propulsion Laboratory (NASA / CALTECH), 4800 Oak Grove Drive, Pasadena, CA 91109, (7)Observatoire de la Côte d'Azu, Valbonne, 6560, France, (8)Université de Paris, Paris, F-75005, France, (9)Department of Earth Science and Engineering, Imperial College London, Prince Consort Road, South Kensington, London, SW7 2BP, United Kingdom, (10)Sorbonne Université, Paris, France, (11)University of Oxford, Oxford, United Kingdom, (12)Curtin University, Perth, Australia, (13)Curtin University, Curtin, Australia, (14)Department of Electrical and Electronic Engineering, Imperial College, London, United Kingdom, (15)Institute for Geophysics, ETH Zürich, Sonneggstrasse 5, Zürich, 8092, Switzerland, (16)Université Toulouse, Toulouse, 31400, France, (17)Centre National d’Etudes Spatiales, Toulouse, France, (18)University of Bristol, Bristol, United Kingdom, (19)University of Maryland, 8000 Regents Dr., College Park, MD 20742-0001, (20)ETH Zurich, Zurich, Switzerland, (21)Reference Systems and Planetology Department, Royal Observatory of Belgium, Brussels, 1180, Belgium, (22)School of Earth Sciences, University of Bristol, Bristol, BS8 1RJ, United Kingdom, (23)Institut de Physique du Globe de Paris, Paris, 75205, France, (24)Malin Space Science Systems, San Diego, CA 92191-0148
A key science objective of the NASA InSight mission is to use seismic waves generated by meteoroid impact events to study the interior of Mars. When combined with orbital imaging of a newly formed impact crater, an impact-generated seismic event can provide an independently determined and exactly measured source location and event energy, which is invaluable for constraining the internal structure of Mars. Here we report on multiple InSight observations of seismic and acoustic waves excited from a suite of meteoroid impact events on Mars. These impact events generated transient acoustic waves during atmospheric entry, impact with the ground, and seismic waves upon impact. We used the arrival times and polarizations of the seismic and acoustic waves to estimate the impact locations, which were subsequently confirmed by orbital images of the estimated impact locations. This new catalog of observations of the crater geometries and measurements of the released seismic energy were then used to verify and improve regional crustal models, ground-truth models of distance-amplitude scaling relationships for impacts at Mars, and confirm the link between impactor momentum and estimated seismic moment. This effort exemplifies the high science return potential of linked mission assets in orbit and on the ground, and demonstrates the value of planetary seismology in understanding the impact cratering process throughout the Solar System.
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