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Global Crustal Thickness Revealed by Surface Waves Orbiting Mars

Kim, D. and Duran, C. and Giardini, D. and Plesa, Ana-Catalina and Stähler, S. and Boehm, C. and Lekic, V. and McLennan, S M and Ceylan, S. and Clinton, J. and Davis, P. and Khan, A. and Knapmeyer‐Endrun, Brigitte and Panning, Mark and Wieczorek, M. and Lognonne, P. and Banerdt, W. Bruce (2023) Global Crustal Thickness Revealed by Surface Waves Orbiting Mars. Geophysical Research Letters, 50 (12), e2023GL103482. Wiley. doi: 10.1029/2023GL103482. ISSN 0094-8276.

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023GL103482


We report observations of Rayleigh waves that orbit around Mars up to three times following the S1222a marsquake. Averaging these signals, we find the largest amplitude signals at 30 and 85 s central period, propagating with distinctly different group velocities of 2.9 and 3.8 km/s, respectively. The group velocities constraining the average crustal thickness beneath the great circle path rule out the majority of previous crustal models of Mars that have a >200 kg/m3 density contrast across the equatorial dichotomy between northern lowlands and southern highlands. We find that the thickness of the Martian crust is 42–56 km on average, and thus thicker than the crusts of the Earth and Moon. Considered with the context of thermal evolution models, a thick Martian crust suggests that the crust must contain 50%–70% of the total heat production to explain present-day local melt zones in the interior of Mars.

Item URL in elib:https://elib.dlr.de/196798/
Document Type:Article
Title:Global Crustal Thickness Revealed by Surface Waves Orbiting Mars
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Kim, D.Institute of Geophysics, ETH Zurich, Zurich, Switzerlandhttps://orcid.org/0000-0003-4594-2336UNSPECIFIED
Duran, C.Institute of Geophysics, ETH Zürich, Zürich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Giardini, D.Institute of Geophysics, Department of Earth Sciences, ETH Zurich, Zurich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Plesa, Ana-CatalinaUNSPECIFIEDhttps://orcid.org/0000-0003-3366-7621UNSPECIFIED
Stähler, S.Institute of Geophysics, ETH Zurich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Boehm, C.Institute of Geophysics, ETH Zurich, Zürich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Lekic, V.Department of Geology, University of Maryland, College Park, USAUNSPECIFIEDUNSPECIFIED
McLennan, S MDepartment of Geosciences, State University of New York at Stony Brook, Stony Brook, NY, 11794-2100, USA.UNSPECIFIEDUNSPECIFIED
Ceylan, S.Institute of Geophysics, ETH Zurich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Clinton, J.Swiss Seismological Service, ETH Zürich, Zürich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Davis, P.University of California, Los Angeles, Department of Earth, Planetary, and Space Sciences, Los Angeles, CA, United StatesUNSPECIFIEDUNSPECIFIED
Khan, A.Institute of Geochemistry and Petrology, ETH Zurich, Zürich, Switzerlandhttps://orcid.org/0000-0003-4462-3173UNSPECIFIED
Knapmeyer‐Endrun, BrigitteBensberg Observatory, University of Cologne, Bergisch Gladbach, GermanyUNSPECIFIEDUNSPECIFIED
Panning, MarkJet Propulsion Laboratory, California Institute of Technology, Pasadena, USAhttps://orcid.org/0000-0002-2041-3190UNSPECIFIED
Wieczorek, M.Département de Géophysique Spatiale et Planétaire/UMR7096-CNRS, Institut de Physique du Globe de Paris, 4 Avenue de Neptune,UNSPECIFIEDUNSPECIFIED
Lognonne, P.institut de physique du globe, paris, franceUNSPECIFIEDUNSPECIFIED
Banerdt, W. BruceJet Propulsion Laboratory, California Institute of Technology, Pasadena, USAhttps://orcid.org/0000-0003-3125-1542UNSPECIFIED
Date:24 June 2023
Journal or Publication Title:Geophysical Research Letters
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:e2023GL103482
Keywords:Mars, Crustal thickness, InSight, Seismic waves
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Exploration of the Solar System, R - Project InSight - HP3
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Plesa, Dr. Ana-Catalina
Deposited On:31 Aug 2023 15:02
Last Modified:04 Dec 2023 11:38

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