JSG T.30

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JSG T.30: Dynamic modeling of deformation, rotation and gravity field variations

Chair: Yoshiyuki Tanaka (Japan)
Affiliation:Commissions 2 and 3, GGOS


Advancements in the Global Geodetic Observation System (GGOS), and terrestrial, aerial and marine geodetic observations have enabled us to monitor deformation, rotation and gravity field variations of the Earth with the unprecedented accuracy, which are caused by geophysical phenomena having various space-time scales. In addition, recent developments of global networks for solid-Earth observations and technologies for laboratory experiments have allowed us to obtain higher-quality and finer-resolution geophysical data for elasticity, density, viscosity, pressure, electromagnetic and thermal structures, etc., reflecting three dimensional heterogeneities in the internal Earth.

The improved geodetic and geophysical data motivate us to interpret the various phenomena, based on dynamic modelling. Through the modelling, we are able to identify the causes of the detected space-time variations and to deepen the understanding of the phenomena. Furthermore, it would help appeal the usefulness of GGOS. This JSG consists of scientists working on dynamic modelling using diverse approaches. The targets of the modelling include local, regional and global variations which occur near the surface down to the inner core. To share different perspectives for modelling stimulates the activities of each member and can produce and/or evolve collaborative studies. For which reason, we form a forum within the ICCT.


  • Development/improvement of forward modelling:
    • Natural phenomena: earthquake, volcano, plate motion, surface fluids, glacial isostatic adjustment (GIA), tides and Earth rotation, etc.
    • Properties of the Earth structure to be modelled: elasticity, viscoelasticity, plasticity, poroelasticity, electromagnetic, thermal and chemical properties, heterogeneities and anisotropies in the Earth structure, etc.
    • Modelling approaches: analytical, semi-analytical and fully numerical methods and associated approximation methods, etc.
    • Comparison between different theories.
    • Opening developed software (if possible).
  • Development or improvement of inversion and simulation methods:
    • Integration of diverse data.
    • Effective processing of a large quantity of data.
    • Data assimilation.
    • Application of various theories to real observations for new scientific findings.

Program of activities

  • To launch an e-mail list to share information concerning research results and to interchange ideas for solving related problems.
  • To open a web page to share information, such as publication lists and its update.
  • To promote international workshops focusing on the above research theme.
  • To propel collaborations with closely related joint study groups such as geodetic, seismic and geodynamic constraints on glacial isostatic adjustment, cryospheric deformation and assessing impacts of loading on reference frame realizations.
  • To have sessions at international meetings and workshops (EGU, AGU, IAG, Hotine-Marussi Symposium, etc.) as needed.


Yoshiyuki Tanaka (Japan), chair
Shin-Chan Han (Australia)
Taco Broerse (Netherlands)
José Fernández (Spain)
Guangyu Fu (China)
Hom Nath Gharti (USA)
Pablo J. González (Spain)
Cheinway Hwang (Taiwan)
Volker Klemann (Germany)
Zdeněk Martinec (Ireland)
Daniel Melini (Italy)
Anthony Mémin (France)
Craig Miller (New Zealand)
Jun’ichi Okuno (Japan)
Riccardo Riva (Netherlands)
Jeanne Sauber (USA)
Giorgio Spada (Italy)
Peter Vajda (Slovak Republic)
Wouter van der Wal (Netherlands