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The seismicity of Mars

Giardini, Domenico and Lognonné, Philippe and Banerdt, William Bruce and Pike, W. T. and Christensen, U. and Ceylan, S. and Clinton, J. F. and van Driel, M. and Stähler, S. C. and Böse, M. and Garcia, Raphaël F. and Khan, A. and Panning, M. and Perrin, C. and Banfield, D. and Beucler, E. and Charalambous, C. and Euchner, F. and Horleston, A. and Jacob, A. and Kawamura, T. and Kedar, S. and Mainsant, G. and Scholz, J.-R. and Smrekar, S. E. and Spiga, A. and Agard, C. and Antonangeli, D. and Barkaoui, S. and Barrett, E. and Combes, P. and Conejero, V. and Daubar, I. and Drilleau, Mélanie and Ferrier, C. and Gabsi, T. and Gudkova, T. and Hurst, K. and Karakostas, F. and King, S. and Knapmeyer, M. and Knapmeyer-Endrun, B. and Llorca-Cejudo, R. and Lucas, A. and Luno, L. and Margerin, L. and McClean, J. B. and Mimoun, David and Murdoch, Naomi and Nimmo, F. and Nonon, M. and Pardo, C. and Rivoldini, A. and Manfredi, J. A. Rodriguez and Samuel, H. and Schimmel, M. and Stott, A. E. and Stutzmann, E. and Teanby, N. and Warren, T. and Weber, R. C. and Wieczorek, M. and Yana, C. The seismicity of Mars. (2020) Nature Geoscience, 13 (3). 205-212. ISSN 1752-0894

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Official URL: https://doi.org/10.1038/s41561-020-0539-8

Abstract

The InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) mission landed in Elysium Planitia on Mars on 26 November 2018 and fully deployed its seismometer by the end of February 2019. The mission aims to detect, characterize and locate seismic activity on Mars, and to further constrain the internal structure, composition and dynamics of the planet. Here, we present seismometer data recorded until 30 September 2019, which reveal that Mars is seismically active. We identify 174 marsquakes, comprising two distinct populations: 150 small-magnitude, high-frequency events with waves propagating at crustal depths and 24 low-frequency, subcrustal events of magnitude Mw 3–4 with waves propagating at various depths in the mantle. These marsquakes have spectral characteristics similar to the seismicity observed on the Earth and Moon. We determine that two of the largest detected marsquakes were located near the Cerberus Fossae fracture system. From the recorded seismicity, we constrain attenuation in the crust and mantle, and find indications of a potential low-S-wave-velocity layer in the upper mantle.

Item Type:Article
Audience (journal):International peer-reviewed journal
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Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
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Funders:
CNES - ANR
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Deposited On:10 Jun 2020 09:28

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