DAzimSurfTomo is a package of direct inversion of surface wave for 3-D isotropic Vsv and azimuthal anisotropy without conventional tomography. Please refer to Liu et al. (2019) for the details of the method. The fast marching method (Rawlinson et al., 2004) is used to compute period-dependent surface wave traveltime and ray paths. The forward computation of surface wave is based on the Thomson-Haskell method (the code of Herrman) (Herrmann, 2013). The inversion frame is similar to DSurfTomo (Fang et al. 2015) for isotropic Vs inversion with the same initial model and input data format.
Github: https://github.com/Chuanming-Liu/DAzimSurfTomo
Please check the manual in ./doc for usage.
V1.0: Mineos is used in the calculation of frequency-dependent phase velocities. Only azimuthal anisotropy is inverted. (Aug, 2017)
V2.0: Both isotropic Vsv perturbation and azimuthal anisotropy are inverted. The transfer matrix method (Herrmann, 2013) is used to calculate frequency-dependent phase velocities. (Jun, 2019)
References:
Liu, C., Yao, H., Yang, H., Shen, W., Fang, H., Hu, S., Qiao, L., 2019. Direct inversion for three-dimensional shear wavespeed azimuthal anisotropy based on surface-wave ray tracing: methodology and application to Yunnan, southwest China. Journal of Geophysics Research: Solid Earth. 124(11), 11394-11413.
Fang, H., Yao, H., Zhang, H., Huang, Y. C., & van der Hilst, R. D., 2015. Direct inversion of surface wave dispersion for three-dimensional shallow crustal structure based on ray tracing: methodology and application. Geophysical Journal International, 201(3), 1251-1263.
Rawlinson, N. & Sambridge, M., 2004. Wave front evolution in strongly heterogeneous layered media using the fast marching method, Geophys. J. Int., 156(3), 631–647.
Herrmann, R. B., 2013. Computer programs in seismology: An evolving tool for instruction and research. Seism Research Letters, 84(6),1081–1088.