The problem with traditional refraction is that it only loves velocity increases with depth. If you have a stiff layer sitting on top of a soft layer (a "velocity inversion"), refraction fails. SW uses the dispersive nature of Rayleigh waves to create a 1D S-wave velocity profile. It turns "noise" (ground roll) into valuable data.

If you have ever spent 4 hours manually picking noisy first breaks, you know the pain. SeisImager’s interactive picker is intuitive. You can see the shot gathers, filter the noise in real-time (bandpass, AGC, or FK filters), and pick with keyboard macros.

If you work in geotechnical engineering, environmental consulting, or hydrogeology, you know the struggle: What is actually happening down there ?