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SUMMARY:Sink or Stall: Subduction Transition Zone Dynamics - Dr Saskia Goe
 s - Imperial College London
DTSTART:20190315T171500Z
DTEND:20190315T174500Z
UID:TALK121378@talks.cam.ac.uk
CONTACT:Ben Johnson
DESCRIPTION:Subducting plates can follow quite different paths in their li
 fe times. While some sink straight through the upper into the lower mantle
 \, others appear to stall in the mantle transition zone above 660 km depth
 . Geodynamicists have long puzzled about what controls these different sty
 les of behaviour\, especially because there appear to be correlations betw
 een sinking or stalling with faster or slower plate motions and mountain b
 uilding or ocean basin formation\, respectively. In the long run\, how eas
 ily slabs sink through the transition zone controls how efficiently materi
 al and heat are circulated in the mantle. Many mechanisms have been propos
 ed for the variable slab transition-zone interaction. We recently reviewed
  the geodynamic and observational literature and combined these insights w
 ith those from our own set of mechanical and thermo-mechanical subduction 
 models. This effort shows that not one single mechanism\, but an interplay
  of several mechanisms is the likely cause of the observed variable subduc
 tion behaviour.\n\n_Saskia is a reader in Geophysics at Imperial College a
 nd the director of the Imperial Centre for Geohazards. With her students a
 nd postdocs\, she has a 25+ year long track record in subduction research\
 , including: shallow and deep subduction earthquakes\, subduction related 
 seismic hazard assessment with seismicity and geodetic data\, subduction e
 volution based on plate reconstructions\, earthquakes\, tectonic data and 
 seismic tomography. In addition\, she has done pioneering work on the dyna
 mic interpretation of seismic structure for plates\, plumes and mantle con
 vection._\n
LOCATION:Tilley Lecture Theater\, Department of Earth Sciences
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