First observations of core-transiting seismic phases on Mars
| العنوان: | First observations of core-transiting seismic phases on Mars |
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| المؤلفون: | Jessica C. E. Irving, Vedran Lekić, Cecilia Durán, Mélanie Drilleau, Doyeon Kim, Attilio Rivoldini, Amir Khan, Henri Samuel, Daniele Antonangeli, William Bruce Banerdt, Caroline Beghein, Ebru Bozdağ, Savas Ceylan, Constantinos Charalambous, John Clinton, Paul Davis, Raphaël Garcia, null Domenico Giardini, Anna Catherine Horleston, Quancheng Huang, Kenneth J. Hurst, Taichi Kawamura, Scott D. King, Martin Knapmeyer, Jiaqi Li, Philippe Lognonné, Ross Maguire, Mark P. Panning, Ana-Catalina Plesa, Martin Schimmel, Nicholas C. Schmerr, Simon C. Stähler, Eleonore Stutzmann, Zongbo Xu |
| المساهمون: | University of Bristol, School of Earth Sciences, Department of Geology, University of Maryland, Institute of Geophysics [ETH Zürich], Department of Earth Sciences [Swiss Federal Institute of Technology - ETH Zürich] (D-ERDW), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich)- Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Royal Observatory of Belgium [Brussels] (ROB), Institut de Physique du Globe de Paris (IPGP (UMR_7154)), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Department of Earth, Planetary, and Space Sciences, University of California Los Angeles, Department of Applied Mathematics and Statistics & Department of Geophysics, Colorado School of Mines, Department of Electrical and Electronic Engineering, Imperial College London, South Kensington Campus, London, United Kingdom, Swiss Seismological Service [ETH Zurich] (SED), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich)- Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich)-Department of Earth Sciences [Swiss Federal Institute of Technology - ETH Zürich] (D-ERDW), School of Earth Sciences [Bristol], University of Bristol [Bristol], Department of Applied Mathematics and Statistics & Department of Geophysics, Colorado School of Mines, Golden, CO, USA, Department of Geosciences, Virginia Tech, Blacksburg, VA, DLR-Berlin, Institute of Planetary Research, Germany, Department of Geology, University of Illinois Urbana-Champaign, Urbana, IL, USA, Geosciences Barcelona - CSIC, Barcelona, Spain, Department of Geology, University of Maryland, College Park, USA, S-CAPAD/DANTE, MAGIS, ANR-19-CE31-0008-08, ANR-18-IDEX-0001 |
| المصدر: | Proceedings of the National Academy of Sciences of the United States of America Proceedings of the National Academy of Sciences of the United States of America, 2023, ⟨10.1073/pnas.2217090120⟩ Proceedings of the National Academy of Sciences of the United States of America, vol 120, iss 18 Proceedings of the National Academy of Sciences of the United States of America, 120 (18) |
| بيانات النشر: | ETH Zurich, 2023. |
| سنة النشر: | 2023 |
| مصطلحات موضوعية: | Core evolution, Mars, Planetary structure, Multidisciplinary, marsquake, [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], planetary structure, Impact, [SDU]Sciences of the Universe [physics], Mars InSight Seismology SKS Core, core evolution, Core, Seismology |
| الوصف: | We present the first observations of seismic waves propagating through the core of Mars. These observations, made using seismic data collected by the InSight geophysical mission, have allowed us to construct the first seismically constrained models for the elastic properties of Mars' core. We observe core-transiting seismic phase SKS from two farside seismic events detected on Mars and measure the travel times of SKS relative to mantle traversing body waves. SKS travels through the core as a compressional wave, providing information about bulk modulus and density. We perform probabilistic inversions using the core-sensitive relative travel times together with gross geophysical data and travel times from other, more proximal, seismic events to seek the equation of state parameters that best describe the liquid iron-alloy core. Our inversions provide constraints on the velocities in Mars' core and are used to develop the first seismically based estimates of its composition. We show that models informed by our SKS data favor a somewhat smaller (median core radius = 1,780 to 1,810 km) and denser (core density = 6.2 to 6.3 g/cm3) core compared to previous estimates, with a P-wave velocity of 4.9 to 5.0 km/s at the core-mantle boundary, with the composition and structure of the mantle as a dominant source of uncertainty. We infer from our models that Mars' core contains a median of 20 to 22 wt% light alloying elements when we consider sulfur, oxygen, carbon, and hydrogen. These data can be used to inform models of planetary accretion, composition, and evolution. Proceedings of the National Academy of Sciences of the United States of America, 120 (18) ISSN:0027-8424 ISSN:1091-6490 |
| وصف الملف: | application/pdf; application/application/pdf |
| اللغة: | English |
| تدمد: | 0027-8424 1091-6490 |
| DOI: | 10.3929/ethz-b-000610528 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::95185c4d4ac2ea963394d0c8b4235f11 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....95185c4d4ac2ea963394d0c8b4235f11 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 00278424 10916490 |
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| DOI: | 10.3929/ethz-b-000610528 |