Sep 11, 2002
Global Seismic Tomography: A Window into the Earth's Deep Interior
Dr. Barbara Romanowicz, Berkeley
I will first review the state of knowledge and introduce some unresolved
issues in global dynamics of the Earth's interior that seismic tomography
can address. I will review the current status of global mantle tomography,
contrasting images obtained using different datasets and inversion
methodologies, and discussing their various strengths and limitations.
I will point out that the downgoing convective flows are better resolved
at the present time than the upwellings. I will then describe how new
waveform inversion approaches can lead to significant progress in seismic
imaging of "hotter" regions, and illustrate this by showing recent results
from anelastic tomography in the upper mantle. I will conclude by
identifying those areas (both in data collection and method development)
where I see potential for progress in the next decade.
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