Speakers: Dr. Jun-Yi Guo, Senior Research Scientist, Division of Geodetic Science, School of Earth sciences, The Ohio State University
Seminar Title:Elastic surface loading
Abstract: The changes of the Earth’s shape, rotation and gravity field are referred to as the three pillars of modern geodesy, and are routinely monitored using space geodetic technologies. The focus of this talk is on the theory of elastic deformation of the Earth under surface mass loading. This theory formulates a set of Love numbers which relates the measured changes of the Earth’s shape and gravity field to the present-day mass redistribution in the atmosphere-hydrosphere-cryosphere system, thus serving as a bridge between geodesy and climate change studies. The talk will first provide a brief introduction to the geophysical and theoretical background. Our work to be presented includes two components. One is our contribution to the classical theory for the spherically symmetrical, non-rotating, elastic and isotropic (SNREI) Earth model. The other is our theory for a laterally heterogeneous and rotating Earth model, which is a generalization of that for the SNREI Earth model, and the effects of the elastic deformation to the changes of the Earth’s shape and gravity field are represented using an extended set of Love numbers. Finally, some potential applications for improved understandings of the Earth system are to be outlined.
Host: Professor C K Shum
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