Mantle Seismic and Viscosity Structures and Post-glacial Rebound 

Post-glacial rebound (PGR) of the Earth's surface is controlled by 
mantle viscosity and deglaciation history of major ice sheets. 
Although most PGR studies assume a deglaciation history that is 
independent of the rebound process, it is possible that they may 
be dynamically related to each other. Therefore understanding mantle
viscosity structure may be important not only for mantle dynamics, but 
also for ice sheet dynamics. Mantle viscosity is strongly dependent 
on mantle thermal structure that can be inferred from seismic studies.
In this talk, I will discuss how we may relate 3-D seismic structure to 
3-D viscosity structure in the mantle and the implications of 3-D 
viscosity structure for PGR. In particular, I will discuss the 
implications of different upper mantle structures in the East and
West Antarctic for the PGR.