LAUSR

The acoustic-elastic coupled equation (AECE) has a number of advantages when compared to the conventional scalar-wave-based elastic reverse-time migration (ERTM) methods used to image ocean bottom multicomponent seismic data. In particular, vector-wave-based ERTM requires vectorial P- and S-waves on both the source and receiver sides, but these cannot be directly obtained from wavefield extrapolation using AECE. We therefore introduced P- and S-waves vector decomposition (VD) approach within AECE; this approach enables the deduction of a novel VD-based AECE, from which vectorial P- and S-waves can be obtained directly via wavefield extrapolation. We are also able to derive a new formulation suitable for vector-wave-based ERTM of ocean bottom multicomponent seismic data that can generate a phase-preserved PS image. We provide three synthetic examples to illustrate the validity and effectiveness of our new method.