Since the Earth is elastic, it is worth the computational burden to process multicomponent data for<br>elastic phenomena with fully coupled time-domain wave-equation propagators. At every time sample in<br>the back-propagated model domain, the complete wave field is decomposed exactly into compressional<br>and shear wave components by simple spatial derivatives. Then, physically significant images are<br>extracted from extrapolated hyper-cubes by applying appropriate imaging conditions. To locate<br>subsurface sources (or diffractors) with the time-reverse modeling algorithm, the imaging condition<br>required is the correlation of P and S energy since only at the source location are the two events<br>collocated. The impulse response of the algorithm is anti-symmetric in physical space and can be<br>enhanced through post-processing with a spatial derivative or integral.


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