One-way

wave-equation migration of compressional and converted waves in a VTI medium Ørjan Pedersen∗ † and Bjørn Ursin ∗ and Hans-Kristian Helgesen†∗ In seismic reflection surveying, by recording both pres-sure and shear-wave reflections, one can increase the amount of information obtained about the subsur-face than by recording pressure waves alone. Geo-logic structures which are not visible by using con-ventional pressure-data may possibly be imaged using shear waves, thus mitigating the risk in oil and gas exploration and production. Horizontally layered sedi-mentary rocks exhibit anisotropy that can be described by an effective transverse isotropic medium with a ver-tical axis of symmetry. Taking into account a vertically transverse isotropic earth, we derive phase-slowness ex-pressions for quasi-P and quasi-SV waves which are used in a one-way wave-equation migration scheme. We derive simplified slowness-expressions which are useful for processing of conventional pressure data. Numer-ical examples demonstrate that the slowness approxi-mations are valid for wide-angle propagation, and the resulting one-way propagators are validated on a series of synthetic tests and applied on a field ocean-bottom seismic dataset. The results show that the method accurately images both compressional and converted waves in OBS data over a vertically transverse isotropic medium