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Initial results from the InSight mission on Mars

W. Bruce Banerdt 1 Suzanne Smrekar 1 Don Banfield 2 Domenico Giardini 3 Matthew Golombek 1 Catherine Johnson 4 Philippe Lognonné 5 Aymeric Spiga 6 Tilman Spohn 7 Clément Perrin 8 Simon Stähler 3 Daniele Antonangeli 9 Sami Asmar Caroline Beghein Neil Bowles 10 Ebru Bozdag 11 Peter Chi Ulrich Christensen 12 John Clinton 13 Gareth Collins 14 Ingrid Daubar 15 Véronique Dehant 16 Melanie Drilleau 8 Matthew Fillingim 17 William Folkner Raphael Garcia 18 Jim Garvin John Grant Matthias Grott 19 Jerzy Grygorczuk 20 Troy Hudson 1 Jessica Irving Gunter Kargl 21 Taichi Kawamura 8 Sharon Kedar 1 Scott King 22 Brigitte Knapmeyer-Endrun 12 Martin Knapmeyer 23 Mark Lemmon 24 Ralph Lorenz 25 Justin Maki 1 Ludovic Margerin Scott Mclennan 26 Chloé Michaut 27 David Mimoun 18 Anna Mittelholz 4 Antoine Mocquet 28 Paul Morgan 29 Nils Mueller 30 Naomi Murdoch 18 Seiichi Nagihara Claire Newman 31 Francis Nimmo 32 Mark Panning 1 W. Thomas Pike Ana-Catalina Plesa 7 Sébastien Rodriguez 33 José Antonio Rodríguez-Manfredi 34 Christopher Russell 35 Nicholas Schmerr Matt Siegler 36 Sabine Stanley 37 Eléanore Stutzmann Nicholas Teanby 38 Jeroen Tromp 11 Martin van Driel 39 Nicholas Warner 40 Renee Weber Mark Wieczorek 8
Abstract : It aims to determine the interior structure, composition and thermal state of Mars, as well as constrain present-day seismicity and impact cratering rates. Such information is key to understanding the differentiation and subsequent thermal evolution of Mars, and thus the forces that shape the planet's surface geology and volatile processes. Here we report an overview of the first ten months of geophysical observations by InSight. As of 30 September 2019, 174 seismic events have been recorded by the lander's seismometer, including over 20 events of moment magnitude M w = 3-4. The detections thus far are consistent with tectonic origins, with no impact-induced seismicity yet observed, and indicate a seismically active planet. An assessment of these detections suggests that the frequency of global seismic events below approximately M w = 3 is similar to that of terrestrial intraplate seismic activity, but there are fewer larger quakes; no quakes exceeding M w = 4 have been observed. The lander's other instruments-two cameras, atmospheric pressure, temperature and wind sensors, a magnetometer and a radiometer-have yielded much more than the intended supporting data for seismometer noise characterization: magnetic field measurements indicate a local magnetic field that is ten-times stronger than orbital estimates and meteorological measurements reveal a more dynamic atmosphere than expected, hosting baroclinic and gravity waves and convective vortices. With the mission due to last for an entire Martian year or longer, these results will be built on by further measurements by the InSight lander.
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Submitted on : Thursday, April 1, 2021 - 11:05:13 AM
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W. Bruce Banerdt, Suzanne Smrekar, Don Banfield, Domenico Giardini, Matthew Golombek, et al.. Initial results from the InSight mission on Mars. Nature Geoscience, Nature Publishing Group, 2020, 13 (3), pp.183-189. ⟨10.1038/s41561-020-0544-y⟩. ⟨hal-02531541⟩

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