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Are there detectable common aperiodic displacements at ITRF co-location sites?
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  • Maylis de La Serve,
  • Paul Rebischung,
  • Xavier Collilieux,
  • Zuheir Altamimi,
  • Laurent Metivier
Maylis de La Serve
Université de Paris, Institut de physique du globe de Paris, CNRS, IGN F-75005 Paris France

Corresponding Author:[email protected]

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Paul Rebischung
Université de Paris, Institut de physique du globe de Paris, CNRS, IGN F-75005 Paris France
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Xavier Collilieux
Université de Paris, Institut de physique du globe de Paris, CNRS, IGN F-75005 Paris France
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Zuheir Altamimi
Université de Paris, Institut de physique du globe de Paris, CNRS, IGN F-75005 Paris France
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Laurent Metivier
Université Paris Diderot,Institut De Physique Du Globe De Paris,Institut national de l’information géographique et forestière
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Abstract

Nowadays, the time evolution of ITRF station positions is described by piece-wise linear models extended with exponential and logarithmic functions to account for post-seismic displacements. The ITRF2020 will also account for seasonal deformation by means of annual and semi-annual sine waves. However, part of the Earth’s surface deformation is not captured by those deterministic functions, such as inter-annual hydrological loading deformation, or high-frequency atmospheric loading deformation. To account for such aperiodic displacements, a reference frame in the form of a time series could be considered. This would require aperiodic motions of the different space geodetic stations to be tied in a common frame by means of co-motion constraints. The relevance of such constraints is however debatable. Indeed, common aperiodic movements between co-located space geodetic stations have thus far not been evidenced. This presentation describes the comparison of station position time series from the different space geodetic techniques in order to highlight whether or not common aperiodic movements can be detected at co-location sites. Those time series are extracted from the solutions provided by the techniques international services for the ITRF2014. They are first carefully aligned to a common reference frame in order to minimize differential network effect. Then, they are cleaned from linear, post-seismic and periodic signals (including seasonal deformation and technique systematic errors). Residual time series from co-located stations are finally confronted with each other.