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For latest .pdf reference see

http://rayfract.com/help/rayfract.pdf

. For SAGEEP 2011 blind refraction session results see

http://rayfract.com/SAGEEP2011_BlindRefraction.pdf

We now support calling Golden Software Surfer version 13.

Also we allow forcing the grid cell size. For latest release notes see

http://rayfract.com/help/release_notes.pdf

Our new tutorials

http://rayfract.com/tutorials/sageep11_16.pdf

and

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

show multiscale tomography using synthetic traveltime data with added Gaussian noise, generated for known subsurface models.

See our updated release notes

http://rayfract.com/help/release_notes.pdf

on top of first page, bullet dated July 6, 2016

on how to try to improve WET resolution by decreasing WET smoothing.

This will not always help to improve resolution, depending on data
quality, shot spacing, basement geometry, recording geometry etc.

Our new tutorial

http://rayfract.com/tutorials/11REFR.pdf

shows joint inversion of refraction shots and VSP shots.

Our new slide show shows how to improve your first break picks. See

http://rayfract.com/tutorials/Slope1.ppt

Or view .pdf version at

http://rayfract.com/tutorials/Slope1.pdf

Our new tutorial

http://rayfract.com/tutorials/tunnel16.pdf

shows imaging of tunnel excavation deformation zone. We now support circular receiver spreads with constant-velocity starting model.

We allow blanking inside the circular spread (shown in above tunnel16.pdf) or blanking outside circular spread for imaging of column or tree trunk.

Our new tutorial

http://rayfract.com/tutorials/KING17.pdf

shows interpretation of first breaks recorded with receivers positioned in 3 boreholes.

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