期刊
GEOPHYSICAL JOURNAL INTERNATIONAL
卷 230, 期 2, 页码 893-907出版社
OXFORD UNIV PRESS
DOI: 10.1093/gji/ggac095
关键词
Pacific Ocean; Inverse theory; Seismic tomography; Surface waves and free oscillations
The article describes the process of building a range of models of Rayleigh-wave velocities in the Pacific upper mantle using the SOLA method, and demonstrates how to analyze the models using resolution and uncertainties. The study identifies a slow-velocity anomaly northeast of Hawaii and a pattern of alternatively slow- and fast-velocity bands between 200 and 300 km depth.
Since most tomographic problems deal with imperfect data coverage and noisy data, an estimate of the seismic velocity in the Earth can only be a local average of the 'true' velocity with some attached uncertainty. We use the SOLA (subtractive optimally localized averages) method, a Backus-Gilbert-type method based on the resolution-uncertainty trade-off, to build a range of models of Rayleigh-wave velocities in the Pacific upper mantle. We choose one solution and show how to analyse the model using its resolution and uncertainties. We exploit the model statistics to evaluate the significance of deviations from a theoretical prediction: a half-space cooling model of the Pacific lithosphere. We investigate a slow-velocity anomaly located northeast of Hawaii, at about 200 km depth, and a pattern of alternatively slow- and fast-velocity bands, aligned approximately northwest to southeast, between 200 and 300 km depth. According to our resolution and uncertainty analyses, both features seem to be resolved.
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