Sorry, I am learning the program of tpwt, following my supervisor. TPWT is already mature work, I recommend you to read these papers if you are interested:
Array Analysis of Two-Dimensional Variations in Surface Wave Phase Velocity and Azimuthal Anisotropy in the Presence of Multipathing Interference(Forsyth, 2005)
Regional tomographic inversion of the amplitude and phase of Rayleigh waves with 2-D sensitivity kernels(Yang, 2006)
Hi i am a fellow researcher i think your work is interesting and i want to contact you if possible.