2012 IRIS Workshop
On Iterative Inversions of Global Crustal Structure Using Finite-frequency Sensitivity Kernels
Kui Liu: Virginia Tech, Ying Zhou: Virginia Tech
3D-reference boundary Frechet kernel
Full-resolution graphics file in original format: 0028.jpg
3D-reference boundary sensitivities (b) are dependent on the local structure of the 3D reference crustal model (for example, CRUST2.0, (a), left). They can predict measured phase-delay times caused by additional perturbations in crustal thickness ((a), right) when perturbations are small (less than 5 km), as shown in (c). Iterative inversions of global crustal structure can be carried out by using phase-velocity kernels to account for large perturbations in crustal thickness in the starting 3D crustal model, and using 3D-reference boundary Frechet kernel to account for small additional perturbations in crustal thickness relative to the starting 3D crustal model.
Acknoweldgements: This research was financially supported by the US National Science Foundation under Grant EAR- 1013617.
For further reading: Liu, K., and Y. Zhou, Effects of global crustal structure on surface-wave phase delays, Geophysical Journal International, in review.
Keywords: surface_wave, crustal_structure, nonlinearity, finite-frequency_effects
|Science Highlights Table of Contents||Other Science Highlights in Category "Crustal Structure"|