Conventional imaging conditions based on cross-correlation of
extrapolated wavefields do not take into account the local spatial
coherence of reflection events. Events are matched based on their
propagation times, which leads to cross-talk between unrelated
events. The stereographic imaging condition introduced in this paper
operates on seismic wavefields that are first decomposed function of
their local slope in space and time. Events are matched based on two
parameters (time and local slope), which separates unrelated events
and eliminates cross-talk. Higher imaging accuracy is achieved at the
expense of larger computational cost. Applications include
simultaneous imaging of different seismic experiments (shots),
multiple attenuation in the imaging condition, etc.