Our latest tutorial

http://rayfract.com/tutorials/NGUP1_1.pdf

shows optimal imaging of vertical fault zones with multiscale tomography using Plus-Minus layered refraction starting model, Steepest Descent method and Cosine-Squared update weighting.

Also see NGU report at

http://www.ngu.no/upload/Publikasjoner/Rapporter/2017/2017_025.pdf