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SUMMARY:When climate loads the Earth: rheology from geodesy - Kristel Chan
 ard (IPGP)
DTSTART:20210310T160000Z
DTEND:20210310T170000Z
UID:TALK155302@talks.cam.ac.uk
CONTACT:Sam Wimpenny
DESCRIPTION:At timescales of seconds to minutes\, encompassed by global se
 ismological observations\, Earth behaves as an almost perfectly elastic bo
 dy displaying only slight attenuation of seismic waves as they propagate. 
 In contrast\, at the timescales of thousands to millions of years associat
 ed with major glacial episodes and planetary-scale deep Earth processes\, 
 Earth is dominated by the viscous deformation of its mantle which is overl
 ain by a relatively thin lithosphere showing nearly elastic behavior only 
 to depths of the order of several tens of kilometers. Between these end-me
 mber timescales\, tidal deformation and postseismic relaxationstudies have
  revealed a transient rheological behavior that is neither purely elastic 
 nor purely viscous. Today\, emerging geodetic observing technologies and c
 ontinuous improvements in data accuracy and coverage of measurements provi
 de an unprecedented opportunity to study various transient processes and a
 dvance our understanding of Earth’s mechanical response across spatial a
 nd temporal scales.\n\nIn particular\, accurate measurements of temporal c
 hanges in the Earth’s shape and rotation due to shifting hydrological\, 
 atmospherical and oceanic mass loads at its surface may bring new informat
 ion on the Earth’s rheology at intermediate timescales. In this talk\, I
  will discuss improvements in geodetic observations arising from innovativ
 e data analysis methods\, as well as recent advances in probing Earth’s 
 transient rheology using its response to surface mass redistribution over 
 seasonal to decadal time scales. A time-dependent description of Earth’s
  rheology may\, in turn\, play a central role in better understanding proc
 esses deforming the solid Earth\, and in monitoring temporal variations in
  terrestrial water storage. 
LOCATION:ONLINE - Details to be sent by email
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