Method for seismic acquisition and processing

A wavefield acquisition and processing method, comprising:

• obtaining wavefield recordings based on activation of at least two sources along one or more activation lines or grids while varying the source activation times of the sources such that at least one shifted replica of a related version of the wavefield of at least one of the sources appears in the frequency-wavenumber domain;
• separating a contribution of at least one of the at least two sources to the obtained wavefield recordings as generated by the at least two sources individually in absence of other sources;
• generating subsurface representations of structures or Earth media properties using the separated contribution of the at least one of the at least two sources;
• and
• outputting the generated subsurface representations,
• wherein the varying of the source activation times of the at least two sources comprises time shifts that vary from source activation location to source activation location and that are representable as a product of at least two separate source activation time functions corresponding to variations in the activation times on at least two different length scales along the one or more activation lines or grids.