Joint Inversion of Crustal and Uppermost Mantle Structure in Western China (Postprint).

摘要

The objective of this research is to develop joint-inversion methods involving P travel times (including secondary P), receiver functions, and surface wave dispersion measurements from ambient noise correlation and to apply them to the western China region to obtain 3D models of P and S structures of the crust and upper mantle. A search-based algorithm (neighborhood algorithm) for joint inversion of surface wave dispersion data, receiver function, and Pn delay time has been implemented. The implementation uses parallel programming with MPI calls, making it possible for massive data processing. Joint inversion methods were tested on HiClimb data, improving resolution of crust and the Moho and showing features of mid-crustal low velocity and Moho variations. A number of improvements on existing methods or lines of work were made: new dispersion maps were compiled; the total number of dispersion measurements was increased more than four-fold; a parallel algorithm for speeding up computation of correlation Green functions by using multi- processors at the same time was implemented; and receiver functions in western China are being systematically processed using a semi-automatic procedure.