LARGE-SCALE 3-DIMENSIONAL EVEN-DEGREE STRUCTURE OF THE EARTH FROM SPLITTING OF LONG-PERIOD NORMAL-MODES
Theory, techniques, and numerical results for retrieval of Earth models (including mantle heterogeneity, topography of the core-mantle boundary (CMB), and inner core anisotropy) are presented. The inversions for Earth models are based upon spectral splitting of 33 isolated multiplets, observed in lo...
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| פורמט: | Journal article |
| שפה: | English |
| יצא לאור: |
1991
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| סיכום: | Theory, techniques, and numerical results for retrieval of Earth models (including mantle heterogeneity, topography of the core-mantle boundary (CMB), and inner core anisotropy) are presented. The inversions for Earth models are based upon spectral splitting of 33 isolated multiplets, observed in long-period accelerograms of 10 large events recorded by the International Deployment of Accelerometers network. Approximately 1000 spectra are involved. It is demonstrated that it is possible to obtain large-scale (spherical harmonic degrees s = 0,2,4) models of mantle heterogeneity from such a data set under the constraint that aspherical perturbations in seismic velocities and density are proportional to one another. -from Authors |
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