1. Green function retrieval versus Interferometric imaging Kees Wapenaar Deyan Draganov Delft University of Technology 2005 Joint Assembly May 25, 2005 New Orleans

2. Green’s function retrieval Interferometric imaging Comparison Contents

3. (passive) data

4. Green’s function retrieval Interferometric imaging Comparison Contents

5. Phys. Rev. Lett., 2004, 93 (25), 254301-1 - 254301-4

9. 1500 m/s 2000 m/s Retrieval of reflection response: acoustic approximation

10. (variable ) (fixed, variable )

12. 1500 m/s 2000 m/s Uncorrelated noise sources

13. (fixed, variable ) (variable )

14. Green’s function retrieval Interferometric imaging Comparison Contents

15. (passive) data

16. Forward extrapolation of ‘source’ Inverse extrapolation of receiver Cross-correlation Integrate along receivers 0 t

17. Forward extrapolation of ‘source’ Inverse extrapolation of receiver Cross-correlation Integrate along receivers Repeat for all subsurface points Ghost

18. Schuster, EAGE 2001, GJI 2004 Artman et al., EAGE 2004 Draganov et al., SEG 2004 Ghost

19. Green’s function retrieval Interferometric imaging Comparison Contents

20. Green’s function retrieval Integration along sources 1500 m/s 2000 m/s Retrieval of reflection response: acoustic approximation

21. Green’s function retrieval Integration along sources Interferometric imaging

22. Green’s function retrieval Integration along sources Interferometric imaging Integration along receivers Ghost

23. Green’s function retrieval Integration along sources Interferometric imaging Integration along receivers

24. Passive Seismic Imaging in Complex Media 33 minutes of white noise recording with 225 subsurface sources Numerical comparison with varying number of underground sources Directly modelled reflection response Reconstructed reflection response Reconstructed depth image

25. Passive Seismic Imaging in Complex Media Numerical comparison with varying number of underground sources 6 minutes of white noise recording with 113 subsurface sources Directly modelled reflection response Reconstructed reflection response Reconstructed depth image

26. Passive Seismic Imaging in Complex Media Numerical comparison with varying number of underground sources 6 minutes of white noise recording with 57 subsurface sources Directly modelled reflection response Reconstructed reflection response Reconstructed depth image

27. Passive Seismic Imaging in Complex Media Numerical comparison with varying number of underground sources 6 minutes of white noise recording with 11 subsurface sources Directly modelled reflection response Reconstructed reflection response Reconstructed depth image

28. Passive Seismic Imaging in Complex Media Numerical comparison with varying number of underground sources 6 minutes of white noise recording with 6 subsurface sources Directly modelled reflection response Reconstructed reflection response Reconstructed depth image

29. Green’s function retrieval diffuse wave fields non-diffuse wave fields: representation theory many sources required primaries and multiples (coda) no medium information required Interferometric imaging diffuse or non-diffuse wave fields few sources required primaries only (multiples imaged as ghosts) background medium required Conclusions