Open Data/Open Source: Seismic Unix scripts to process a 2D land line

Shot record velocity filter

I applied velocity filtering (sudipfilt) to remove the ground roll. I processed the receivers leading the shotpoint separately from the trailing receivers (i.e. I split the shots). I decided to split the shots so that I could use an asymmetrical dip filter (-15,5 ms/trace). That dip filter is similar to the 1981 processing that used (-12,4). Sudipfilter was intended for post stack processing, so I wrote the script alaskavelfilt.sh to loop over the shots and divide individual shotrecords into positive and negative offsets. Figure 7 shows the Figure 4 shotpoint with velocity filtering applied.

The command:

scons velfiltrec24.view

or using the tar file:

../velfiltrec24.job

applies velocity filtering and produces the figure.

velfiltrec24
Figure 7. The 24th shot record after agc and velocity filter.

Open Data/Open Source: Seismic Unix scripts to process a 2D land line