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SUMMARY:Searching the Core-Mantle Boundary for the roots of plumes - James
  Atkins (University of Cambridge)
DTSTART:20241202T180000Z
DTEND:20241202T190000Z
UID:TALK223660@talks.cam.ac.uk
CONTACT:124546
DESCRIPTION:Ultra-low velocity zones (ULVZs) are wide and thin regions of 
 greatly reduced seismic velocities that lie on the core-mantle boundary. T
 hey may play a role in whole mantle dynamics\; as passive tracers or more 
 actively feeding into or anchoring plume hotspots. While individual ULVZs 
 have been found near and far from hotspots\, the largest ULVZs appear to b
 e found near the hotspots with the highest buoyancy flux and most extreme 
 isotopic ratios. However\, a unified global distribution of ULVZs is still
  debated. As well as this\, questions remain about the origin and composit
 ion of ULVZs. I will talk about my work using postcursory energy to the se
 ismic phase Sdiff to produce a self-consistent global map of ULVZs in orde
 r to analyse their potential relationship with both plumes and other deep 
 mantle features. This phase has previously been used to locate and model t
 he 3D structure of ULVZs on an individual basis\, and its long diffracted 
 portion makes it particularly well-suited to studying large areas of the c
 ore-mantle boundary.
LOCATION:Harker 1 lecture room\, Department of Earth Sciences\, Downing Si
 te
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