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    Evaluating temporal stability of the New Zealand quasigeoid following the 2016 Kaikōura earthquake using satellite radar remote sensing

    81682.pdf (3.384Mb)
    Access Status
    Open access
    Authors
    McCubbine, J.C.
    Stagpoole, V.
    Caratori Tontini, F.
    Featherstone, Will
    Garthwaite, M.C.
    Brown, N.J.
    Amos, M.J.
    Fukuda, Y.
    Kazama, T.
    Takiguchi, H.
    Nishijima, J.
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    McCubbine, J.C. and Stagpoole, V. and Caratori Tontini, F. and Featherstone, W.E. and Garthwaite, M.C. and Brown, N.J. and Amos, M.J. et al. 2020. Evaluating temporal stability of the New Zealand quasigeoid following the 2016 Kaikōura earthquake using satellite radar remote sensing. Geophysical Journal International. 220 (3): pp. 1917-1927.
    Source Title
    Geophysical Journal International
    DOI
    10.1093/gji/ggz536
    ISSN
    0956-540X
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    Remarks

    This article has been accepted for publication in Geophysical Journal International ©: The Author(s) 2019. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/81640
    Collection
    • Curtin Research Publications
    Abstract

    Quasigeoid models can be determined from surface gravity anomalies, so are sensitive to changes in the shape of the topography as well as changes in gravity. Here we present results of forward modelling gravity/quasigeoid changes from synthetic aperture radar data following the 2016 Mw 7.8 Kaikōura earthquake with land uplift of up to 10 m. We assess the impact of the topographic deformation on the reference surface of the New Zealand vertical datum in lieu of costly field gravity field measurements. The most significant modelled gravity and quasigeoid changes are-2.9 mGal and 5-7 mm, respectively. We compare our forward modelled gravity signal to terrestrial gravity observation data and show that differences between the data sets have a standard deviation of ±0.1 mGal. The largest modelled change in the quasigeoid is an order of magnitude smaller than the 57.7 mm estimated precision of the most recently computed NZGeoid model over the Kaikōura region. Modelled quasigeoid changes implied by this particular deformation event are not statistically significant with respect to estimated precision of the New Zealand quasigeoid model.

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