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SUMMARY:Surface wave tomography: insights into the structure of the upper 
 mantle beneath Australia - Stewart Fishwick (University of Cambridge)
DTSTART:20061025T153000Z
DTEND:20061025T163000Z
UID:TALK5489@talks.cam.ac.uk
CONTACT:4047
DESCRIPTION:The latest surace wave tomographic models of Australia are pre
 sented. These models incorporate new data\, particularly useful in the wes
 tern half of the continent\, containing the majority of the oldest Archaea
 n cratons. A variety of improved techniques have been developed to improve
  the reliabilty of the tomographic images. Multiple starting models are \n
 used within the waveform inversion procedure\, giving improved path covera
 ge\, and a better estimate on the uncertainty of the 1D path averaged mode
 l. A multi-scale tomographic method is illustrated\, thus \ndamping the fi
 nal images towards large scale features in the data\, rather than the init
 ial\, homogenous\, a priori reference model. The qualititative relationshi
 p between the tomographic images and known geology and tectonics is discus
 sed\, with focus on the shallow structure of the eastern margin of Austral
 ia\, and also the variations in structure of the shield region.
LOCATION:Marine/Wolfson Building lecture hall
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