OATAO - Open Archive Toulouse Archive Ouverte Open Access Week

Seismic detection of the martian core

Stähler, Simon C. and Khan, Amir and Banerdt, W. Bruce and Lognonné, Philippe and Giardini, Domenico and Ceylan, Savas and Drilleau, Mélanie and Duran, A. Cecilia and Garcia, Raphaël F. and Huang, Quancheng and Kim, Doyeon and Lekic, Vedran and Samuel, Henri and Schimmel, Martin and Schmerr, Nicholas and Sollberger, David and Stutzmann, Éléonore and Xu, Zongbo and Antonangeli, Daniele and Charalambous, Constantinos and Davis, Paul M. and Irving, Jessica C. E. and Kawamura, Taichi and Knapmeyer, Martin and Maguire, Ross and Marusiak, Angela G. and Panning, Mark P. and Perrin, Clément and Plesa, Ana-Catalina and Rivoldini, Attilio and Schmelzbach, Cédric and Zenhäusern, Géraldine and Beucler, Éric and Clinton, John and Dahmen, Nikolaj and van Driel, Martin and Gudkova, Tamara and Horleston, Anna and Pike, W. Thomas and Plasman, Matthieu and Smrekar, Suzanne E. Seismic detection of the martian core. (2021) Science, 373 (6553). 443-448. ISSN 0036-8075

[img] (Document in English)

PDF - Depositor and staff only - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
9MB

Official URL: https://doi.org/10.1126/SCIENCE.ABI7730

Abstract

Clues to a planet’s geologic history are contained in its interior structure, particularly its core. We detected reflections of seismic waves from the core-mantle boundary of Mars using InSight seismic data and inverted these together with geodetic data to constrain the radius of the liquid metal core to 1830 ± 40 kilometers. The large core implies a martian mantle mineralogically similar to the terrestrial upper mantle and transition zone but differing from Earth by not having a bridgmanite-dominated lower mantle. We inferred a mean core density of 5.7 to 6.3 grams per cubic centimeter, which requires a substantial complement of light elements dissolved in the iron-nickel core. The seismic core shadow as seen from InSight’s location covers half the surface of Mars, including the majority of potentially active regions—e.g., Tharsis—possibly limiting the number of detectable marsquakes.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Laboratory name:
Statistics:download
Deposited On:12 Jan 2022 09:53

Repository Staff Only: item control page