First observations of core-transiting seismic phases on Mars

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dc.contributor.authorIrving, J. C. E.en
dc.contributor.authorLekic, V.en
dc.contributor.authorDurán, C.en
dc.contributor.authorDrilleau, M.en
dc.contributor.authorKim, D.en
dc.contributor.authorRivoldini, A.en
dc.contributor.authorKhan, A.en
dc.contributor.authorSamuel, H.en
dc.contributor.authorAntonangeli, D.en
dc.contributor.authorBruce Banerdt, W.en
dc.contributor.authorBeghein, C.en
dc.contributor.authorBozdagk, E.en
dc.contributor.authorCeylan, S.en
dc.contributor.authorCharalambous, C.en
dc.contributor.authorClinton, J.en
dc.contributor.authorDavis, P.en
dc.contributor.authorGarcia, R.en
dc.contributor.authorGiardini, D.en
dc.contributor.authorCatherine Horleston, A.en
dc.contributor.authorHuang, Q.en
dc.contributor.authorHurst, K. J.en
dc.contributor.authorKawamura, T.en
dc.contributor.authorKing, Scott D.en
dc.contributor.authorKnapmeyer, M.en
dc.contributor.authorLi, J.en
dc.contributor.authorLognonné, P.en
dc.contributor.authorMaguire, R.en
dc.contributor.authorPanning, M. P.en
dc.contributor.authorPlesa, A. C.en
dc.contributor.authorSchimmel, M.en
dc.contributor.authorSchmerr, N. C.en
dc.contributor.authorStählerc, S. C.en
dc.contributor.authorStutzmann, E.en
dc.contributor.authorXu, Z.en
dc.date.accessioned2023-08-03T18:35:34Zen
dc.date.available2023-08-03T18:35:34Zen
dc.date.issued2023-05-02en
dc.date.updated2023-08-03T18:29:25Zen
dc.description.abstractWe 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.en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1073/PNAS.2217090120en
dc.identifier.eissn1091-6490en
dc.identifier.issn0027-8424en
dc.identifier.issue118en
dc.identifier.orcidKing, Scott [0000-0002-9564-5164]en
dc.identifier.pmid37094138en
dc.identifier.urihttp://hdl.handle.net/10919/115979en
dc.identifier.volume120en
dc.language.isoenen
dc.publisherProceedings of the National Academy of Sciencesen
dc.relation.urihttps://www.ncbi.nlm.nih.gov/pubmed/37094138en
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectMarsen
dc.subjectcore evolutionen
dc.subjectplanetary structureen
dc.titleFirst observations of core-transiting seismic phases on Marsen
dc.title.serialProceedings of the National Academy of Sciences of the United States of Americaen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherJournal Articleen
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Scienceen
pubs.organisational-group/Virginia Tech/Science/Geosciencesen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Science/COS T&R Facultyen

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