One of the problems with most geophysics techniques is they provide only a single answer and no measure of the uncertainty of the estimation. In Appendix , I show how we can modify the way we set up the inverse problem to obtain equi-probable results. By comparing and contrasting these realizations we can better understand model variability and uncertainty.
In Appendix and , I extend the concepts introduced in Chapters and to 3-D. Appendix shows how a 3-D steering filter can be constructed by cascading two 2-D filter. Finally, in Appendix , I derive a 3-D tau tomography operator.