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    Seismic Velocity Variations in a 3D Martian Mantle: Implications for the InSight Measurements

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    2020JE006755.pdf
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    4.113Mb
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    PDF
    Description:
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    Type
    Article
    Authors
    Plesa, Ana-Catalina cc
    Bozdağ, E.
    Rivoldini, Attilio cc
    Knapmeyer, Martin cc
    McLennan, Scott cc
    Padovan, S. cc
    Tosi, Nicola cc
    Breuer, Doris cc
    Peter, Daniel cc
    Staehler, Simon cc
    Wieczorek, M. A. cc
    van Driel, M. cc
    Khan, A. cc
    Spohn, T. cc
    KAUST Department
    Earth Science and Engineering Program
    Extreme Computing Research Center
    Physical Science and Engineering (PSE) Division
    Date
    2021-06-17
    Online Publication Date
    2021-06-17
    Print Publication Date
    2021-06
    Embargo End Date
    2021-11-14
    Submitted Date
    2020-10-30
    Permanent link to this record
    http://hdl.handle.net/10754/669493
    
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    Abstract
    We use a large data set of 3D thermal evolution models to predict the distribution of present-day seismic velocities in the Martian interior. Our models show a difference between maximum and minimum S-wave velocity of up to 10% either below the crust, where thermal variations are largest, or at the depth of the olivine to wadsleyite phase transition, located at around 1000 – 1200 km depth. Models with thick lithospheres on average have weak low-velocity zones that extend deeper than 400 km, and seismic velocity variations in the uppermost 400 – 600 km that closely follow the crustal thickness pattern. For these cases the crust contains more than half of the total amount of heat producing elements. Models with limited crustal heat production have thinner lithospheres and shallower but prominent low-velocity zones that are incompatible with InSight observations. Seismic events suggested to originate in Cerberus Fossae indicate the absence of S-wave shadow zones in 25° - 30° epicentral distance. This result is compatible with previous best-fit models that require a large average lithospheric thickness and a crust containing more than half of the bulk amount of heat producing elements to be compatible with geological and geophysical constraints. Ongoing and future InSight measurements that will determine the existence of a weak low-velocity zone will directly bear on the crustal heat production.
    Citation
    Plesa, A. -C., Bozdağ, E., Rivoldini, A., Knapmeyer, M., McLennan, S. M., Padovan, S., … Spohn, T. (2021). Seismic Velocity Variations in a 3D Martian Mantle: Implications for the InSight Measurements. Journal of Geophysical Research: Planets. doi:10.1029/2020je006755
    Publisher
    American Geophysical Union (AGU)
    Journal
    Journal of Geophysical Research: Planets
    DOI
    10.1029/2020je006755
    Additional Links
    https://onlinelibrary.wiley.com/doi/10.1029/2020JE006755
    ae974a485f413a2113503eed53cd6c53
    10.1029/2020je006755
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Extreme Computing Research Center; Earth Science and Engineering Program

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