IC SG8

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JSG 0.8: Earth System Interaction from Space Geodesy

Chair: S. Jin (China)
Affiliation:Comm. 2, 3 and 4

Introduction

The gravity field and geodetic mass loading reflect mass redistribution and transport in the Earth’s fluid envelope, and in particular interactions between atmosphere, hydrosphere, cryosphere, land surface and the solid Earth due to climate change and tectonics activities, e.g., dynamic and kinematic processes and co-/post-seismic deformation. However, the traditional ground techniques are very difficult to obtain high temporal-spatial resolution information and processes, particularly in Tibet. With the launch of the Gravity Recovery and Climate Experiment (GRACE) mission since 2002, it was very successful to monitor the Earth’s time-variable gravity field by determining very accurately the relative position of a pair of Low Earth Orbit (LEO) satellites. Therefore, the new generation of the gravity field derived from terrestrial and space gravimetry, provides a unique opportunity to investigate gravity-solid earth coupling, physics and dynamics of the Earth’s interior, and mass flux interaction within the Earth system, together with GPS/InSAR.

Objectives

  • To quantify mass transport within the Earth’s fluid envelope and their interaction in the Earth system.
  • To monitor tectonic motions using gravimetry/GPS, including India-Tibet collision, post-glacial uplift and the deformation associated with active tectonic events, such as earthquakes and volcanoes.
  • To develop inversion algorithm and theories in a Spherical Earth on gravity field related deformation and gravity-solid Earth coupling, e.g. crust thickness, isostatic Moho undulations, mass loadings and geodynamics.
  • To develop methods to extract a geodynamic signals related to Solid-Earth mantle and/or core and to understand the physical properties of the Earth interior and its dynamics from the joint use of gravity data and other geophysical measurements.
  • To analyze and model geodynamic processes from isostatic modelling of gravity and topography data as well as density structure of the Earth’s deep interior.
  • To address mantle viscosity from analyzing post-seismic deformations of large earthquakes and postglacial rebound (PGR) and to explain the physical relationships between deformation, seismicity, mantle dynamics, lithospheric rheology, isostatic response, etc.
  • To achieve these objectives, the IC SG interacts and collaborates with the ICCT and all IAG Commissions.

Program of activities

  • Organization of SG workshop and of conference sessions,
  • Participation in related scientific conference and sympo-sia,
  • Supporting contributions to the ICCT activities.

Members

Shuanggen Jin (China), chair
David J. Crossley (USA)
Carla Braitenberg (Italy)
Isabelle Panet (France)
Jacques Hinderer (France)
Séverine Rosat (France)
Tonie M. van Dam (Luxembour)
Urs Marti (Switzerland)
Patrick Wu (Canada)
Isabella Velicogna (USA)
Nico Sneeuw (Germany)