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    Impact cutoff frequency: Momentum scaling law inverted from Apollo seismic data

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    Authors
    Gudkova, T.
    Lognonné, P.
    Miljković, Katarina
    Gagnepain-Beyneix, J.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Gudkova, T. and Lognonné, P. and Miljkovic, K. and Gagnepain-Beyneix, J. 2015. Impact cutoff frequency: Momentum scaling law inverted from Apollo seismic data. Earth and Planetary Science Letters. 427: pp. 57-65.
    Source Title
    Earth and Planetary Science Letters
    DOI
    10.1016/j.epsl.2015.06.037
    ISSN
    0012-821X
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/2730
    Collection
    • Curtin Research Publications
    Abstract

    © 2015 Elsevier B.V. We perform the analysis of both long and short period data for 40 large meteoroid impacts event gathered by the Apollo lunar seismic network. We extract the linear momentum released by the impact and the cutoff frequency of the recorded seismic spectrum, related to the radiation process of the shock wave generated by the impact. By using a proxy to the local porosity, based on the density of surface craters and well correlated to the most recent GRAIL observations, we demonstrate that the seismic cutoff frequencies for 40 selected impacts correlate with this proxy and therefore likely with the porosity at the impacted areas. Our finding shows that lunar seismic records of meteoroid impacts represent unique geophysical data documenting medium to high-energy (0.1-1 kt TNT yield) impact processes, including the interaction of shock waves with porous media. This work can be applied to the analysis of the seismic data to be obtained by the InSight mission in 2016 and the investigation of the lateral variations in the Martian regolith.

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