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CATEGORIES:Sedgwick Club talks
SUMMARY:Sink or Stall: Subduction Transition Zone Dynamics
  - Dr Saskia Goes - Imperial College London
DTSTART;TZID=Europe/London:20190315T171500
DTEND;TZID=Europe/London:20190315T174500
UID:TALK121378AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/121378
DESCRIPTION:Subducting plates can follow quite different paths
  in their life times. While some sink straight thr
 ough the upper into the lower mantle\, others appe
 ar to stall in the mantle transition zone above 66
 0 km depth. Geodynamicists have long puzzled about
  what controls these different styles of behaviour
 \, especially because there appear to be correlati
 ons between sinking or stalling with faster or slo
 wer plate motions and mountain building or ocean b
 asin formation\, respectively. In the long run\, h
 ow easily slabs sink through the transition zone c
 ontrols how efficiently material and heat are circ
 ulated in the mantle. Many mechanisms have been pr
 oposed for the variable slab transition-zone inter
 action. We recently reviewed the geodynamic and ob
 servational literature and combined these insights
  with those from our own set of mechanical and the
 rmo-mechanical subduction models. This effort show
 s that not one single mechanism\, but an interplay
  of several mechanisms is the likely cause of the 
 observed variable subduction behaviour.\n\n_Saskia
  is a reader in Geophysics at Imperial College and
  the director of the Imperial Centre for Geohazard
 s. With her students and postdocs\, she has a 25+ 
 year long track record in subduction research\, in
 cluding: shallow and deep subduction earthquakes\,
  subduction related seismic hazard assessment with
  seismicity and geodetic data\, subduction evoluti
 on based on plate reconstructions\, earthquakes\, 
 tectonic data and seismic tomography. In addition\
 , she has done pioneering work on the dynamic inte
 rpretation of seismic structure for plates\, plume
 s and mantle convection._\n
LOCATION:Tilley Lecture Theater\, Department of Earth Scien
 ces
CONTACT:Ben Johnson
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