f Practical 3D wavefield tomography on field datasets

Waveform tomography has been used for a number of years in 2D on synthetics and field data<br>and recently in 3D (Stekl et al 2007, Ben Hadj Ali et al 2007, Sirgue et al 2007) but only on<br>synthetics data sets. 3D waveform inversion is still computationally expensive procedure but<br>recent developments on computing power have enabled application of the procedure on the<br>production scale data. We are going to show results obtained by 3D waveform inversion<br>method developed by Stekl, Warner, Umpleby 2007 on a field data set over a shallow<br>channel.