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SUMMARY:Laterally varying structure and solidification texture of the inne
 r core - Special Seminar - Prof. Vernon  Cormier (University of Connecticu
 t)
DTSTART:20100510T130000Z
DTEND:20100510T140000Z
UID:TALK24377@talks.cam.ac.uk
CONTACT:Jessica Irving
DESCRIPTION:Lateral variations in the velocity\, attenuation\, anisotropy\
 , and scattering of seismic waves interacting with the inner core are more
  complex than a simple hemispherical pattern\, exhibiting spatial correlat
 ion with the non-dipole magnetic field and with large-scale velocity struc
 ture in the lowermost outer core.  In several regions of the uppermost inn
 er core\, it is possible to observe and model the effects of small-scale (
 < 10km) heterogeneity on both back-scattered PKiKP coda and forward scatte
 red waves that broaden the PKIKP waveform. At antipodal ranges (175 to 180
 )\, sparse   global observations of diffraction from the PKP-C cusp and PK
 IIKP\, in addition to other focused and multipathed phases\, observed or h
 ypothesized\, can provide tests on the existence of large-scale lateral he
 terogeneity and strong vertical gradients. Lateral variations in the proce
 ss of compositional convection in the outer core may possibly explain some
  correlations of inner core structure with spatially persistent features o
 f the non-dipole field.
LOCATION:Marine/Wolfson Building lecture hall
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