Down-hole VSP Processing for Reflections

The following signal processing applications are included as a set to illustrate how a Vertical Seismic Profile (VSP) may be processed for reflections. The steps are:

1. BGAZ 12.0.12 gain correction:
   bgaz twave.seg 5 20 0.6
2. BSHF 12.1.1 flatten data on direct arrivals + 20 ms.
   mv bgaztwav.seg 00X5.seg
bshf 00X5.seg 0 1 .02
3. BMED 12.1.2 median mix of flattened data to extract down going wave.
   bmed bshf00X5.seg 15
4. BSUM 12.1.4 subtract direct wave from total wavefield.
   bsum bshf00X5 bmedbshf.seg -1.0
5. BSHF 12.1.1 restore to 1-way time.
   bshf bsumbshf 0 0 -.02
6. BSHF 12.1.1 shift to 2-way time to flatten reflections (adding the direct arrival times again)
   bshf bshfbsum 0 0 0.