next up previous [pdf]

Next: Imaging with scalar wavefields Up: Yan and Sava: Angle-domain Previous: Elastic imaging vs. acoustic

Conventional elastic imaging conditions

For vector elastic wavefields, the cross-correlation imaging condition needs to be implemented on all components of the displacement field. The problem with this type of imaging condition is that the source and receiver wavefields contain a mix of P- and S-wave modes which cross-correlate independently, thus hampering interpretation of migrated images. An alternative to this type of imaging performs wavefield separation of scalar and vector potentials after wavefield reconstruction in the imaging volume, but prior to the imaging condition and then cross-correlate pure modes from the source and receiver wavefields, as suggested by Dellinger and Etgen (1990) and illustrated by Cunha Filho (1992).



Subsections


2013-08-29