Preface; 1. Introduction and overview of the book; 2. Green's function estimation from noise cross correlations; 3. Travel time estimation from noise cross correlations using stationary phase; 4. Overview of conventional sensor array imaging; 5. Passive array imaging of reflectors using ambient noise illumination; 6. Resolution analysis for passive array imaging using ambient noise illumination; 7. Travel time estimation using ambient noise in weakly scattering media; 8. Correlation-based reflector imaging using ambient noise in weakly scattering media; 9. Virtual source imaging in homogeneous media; 10. Virtual source imaging in scattering media; 11. Imaging with intensity cross correlations; 12. A review of wave propagation in random media; Appendix. Basic facts from analysis and probability; References; Index.