A method of datuming multi-component seismic data, comprising: accessing (410, 510) a plurality of seismic traces, obtained by a multi-component receiver (103, 203, 303, 703, 803) comprising a pressure sensor and a particle motion sensor for detecting two or three components of particle motion, the plurality of seismic traces including data representative of amplitude and spatial gradient samples of a seismic wavefield at a plurality of recording locations in a medium, initiating (420, 530, 620) using a computer-based processing unit, a wavefield propagation from the plurality of recording locations through the medium using the amplitude and spatial gradient samples of the seismic wavefield; and generating (430, 540, 630) seismic traces corresponding to the propagated wavefield at defined locations within the medium; wherein the data in the plurality of particle motion traces is representative of the spatial gradient samples of the seismic wavefield; wherein each generated seismic trace corresponds to one of said defined locations within said medium at a plurality of instances in time; and wherein at least some of the defined locations are offset in depth within the medium from at least some of the plurality of recording locations; the method further characterised in that at least some of the accessed seismic traces include a pressure trace recorded as a function of time and two or three components of particle motion traces recorded as a function of time for each recording location; a plurality of seismic traces are generated for each defined location; and the defined locations are arranged in a gridded datum player (320, 720). accessing (410, 510) a plurality of seismic traces, obtained by a multi-component receiver (103, 203, 303, 703, 803) comprising a pressure sensor and a particle motion sensor for detecting two or three components of particle motion, the plurality of seismic traces including data representative of amplitude and spatial gradient samples of a seismic wavefield at a plurality of recording locations in a medium, initiating (420, 530, 620) using a computer-based processing unit, a wavefield propagation from the plurality of recording locations through the medium using the amplitude and spatial gradient samples of the seismic wavefield; and generating (430, 540, 630) seismic traces corresponding to the propagated wavefield at defined locations within the medium; wherein the data in the plurality of particle motion traces is representative of the spatial gradient samples of the seismic wavefield; wherein each generated seismic trace corresponds to one of said defined locations within said medium at a plurality of instances in time; and wherein at least some of the defined locations are offset in depth within the medium from at least some of the plurality of recording locations; the method further characterised in that at least some of the accessed seismic traces include a pressure trace recorded as a function of time and two or three components of particle motion traces recorded as a function of time for each recording location; a plurality of seismic traces are generated for each defined location; and the defined locations are arranged in a gridded datum player (320, 720).