Improvements of Uniqueness, Stability, and Constraints for Receiver Functions Modeling
Abstract
The modeling of teleseismic receiver functions has become an established technique to retrieve properties of crustal and upper mantle structure beneath a receiver, such as the crustal thickness, the crustal average Poisson's ratio, and S-wave velocity structure of the crust and upper mantle. The receiver function is considered predominantly sensitive to the sharp gradients in the lithospheric elastic parameters, and it is not possible to achieve a unique solution of absolute velocities as a function of depth unless other, independent constraints are combined with receiver functions due to the non-linearity and non-uniqueness of inversions for receiver functions. In order to provide more stable models for the crust and upper mantle, we address the above issues by improving the linear inversion method, the construction of initial model, and the generation of stacked receiver function data. Our methods and techniques include: (1) advance the method of H-κ domain search to provide accurate and stable measurements for the crustal thickness and Poisson's ratio; (2) construct an initial model from multiple constraints including the results of grid search, H-κ domain search, and independent studies of lithospheric velocity structure; (3) generate stacked receiver function observations by correcting the amplitude of receiver functions and aligning receiver functions in accordance with all arrivals of P-to-S converted phase and crustal multiples. (4) assign different weight factors to different Moho related phases and receiver function traces in the inversion program. To validate the improvements for the modeling of receiver functions, we test our approaches on both synthetic and observed data from broad band stations situated in well-studied geologic regions in China, and propose to utilize them to enhance the uniqueness and stability of receiver function studies for other geologic regions.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2011
- Bibcode:
- 2011AGUFM.S31E2277C
- Keywords:
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- 0545 COMPUTATIONAL GEOPHYSICS / Modeling;
- 7205 SEISMOLOGY / Continental crust;
- 7218 SEISMOLOGY / Lithosphere;
- 7294 SEISMOLOGY / Seismic instruments and networks