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SUMMARY:Characterizing global small-scale heterogeneity in the mantle – 
 Interrogating the high-frequency\, scattered seismic wavefield - Sebastian
  Rost - University of Leeds
DTSTART:20200304T160000Z
DTEND:20200304T170000Z
UID:TALK137419@talks.cam.ac.uk
CONTACT:Jenny Jenkins
DESCRIPTION:The high-frequency seismic wavefield is dominated by extended 
 codas trailing the ballistic arrivals. These codas mainly consist of scatt
 ered energy due to the interaction of the seismic wavefield with heterogen
 eities in velocity and/or density that are on the order of the seismic wav
 elength. Interrogating this energy provides additional information on Eart
 h structure on small-scale lengths that is not assessible with many other 
 seismic imaging techniques such as traveltime tomography.\n \nMost of the 
 scattered energy originates from shallow heterogeneities close to source o
 r receiver and has been used to characterize heterogeneities in crust and 
 lithosphere using the codas of direct P- and S-waves\, but a few seismic p
 robes exist that allow us to sample the heterogeneity structure of the dee
 p Earth (e.g. PKP and PKKP). Using statistical and deterministic approache
 s with different datasets I will present the present day resolved heteroge
 neity structure of the mantle from the core-mantle boundary to the upper m
 antle and lithosphere. I will make links between the distribution of the d
 etected small-scale heterogeneities and mantle structures detected using o
 ther imaging techniques (e.g. tomography) and geodynamic models. Using the
  frequency dependence of the scattering process allows us to estimate the 
 dominant scale-lengths of the heterogeneities and modelling of the seismic
  wavefield provides some insight into the heterogeneity structure.
LOCATION:Marine/Wolfson Building lecture hall\, Bullard Labs.
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