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In the world of academic tomography codes, Colin Zelt’s FAST is one of the most well-known and widely-used. This is for good reason, since it works well, it has been thoroughly tested, and it’s written in pure Fortran (i.e. it’s fast). It’s so widely used, in fact, that I think the argument can be made that it’s more standardized (in the academic world) than the integrated seismic processing suites like ProMAX (or GLOBE Claritas!). When collaborating with other researchers, it’s nice to share first-arrival picks, but emailing a ~60GB SEG-Y file doesn’t … Continue Reading

So it turns out it absolutely is possible to approximate a cosine squared taper in Seismic Unix. The trick is to do a sine or cosine taper, square the whole thing, and then divide by the original.

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I want to take two velocity models stored as SEG-Y and blend them together. It doesn’t strike me as all that strange a request, but I have yet to find a processing package (that we have) that can do it.

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