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Bio
My most significant contributions to understanding the Earth's interior have come through a combination of observational and interpretational work on seismic data. This includes the introduction of innovative methods and techniques, and new data. I have been interested in improving spatial sampling by seismic waves of various parts of the Earth's interior, such as the inner core, the lowermost mantle and the lithosphere. During my graduate student days at the University of California at Berkeley, I assembled and analyzed a high-quality global dataset of differential travel times of the core- and deep mantle-sensitive seismic waves. In 1998, with colleagues L. Breger and B. Romanowicz, we observed distinct trends in PKP differential travel time residuals (when the latter were plotted as a function of the angle between Earth's rotation axis and PKP leg in the inner core), by distinguishing among several different geographical samplings of the corresponding paths in the mantle. We showed that most of the trends observed in PKP differential travel time residuals stem from heterogeneities in the lowermost mantle (2000). In particular, we were able to assess how much of the core-sensitive PKP travel-time data can be explained by mantle structure alone. Using PKP and PcP-P differential travel time data, I developed a 3-D compressional velocity model of the lowermost mantle (2002), and outlined its relevance for understanding anisotropic structure of the Earth's core.
Research Interests
Papers共 13 篇Author StatisticsCo-AuthorSimilar Experts
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Sheng Wang,Hrvoje Tkalčić
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