Patent ID: 8335651

Claim:
A method in a host of determining the propagation angles of reflected seismic waves, comprising: inputting data representing reflected seismic waves in a memory; inputting a propagation velocity field in the memory; using the propagation velocity field to migrate the data with a downward continuation Fourier domain shot record migration by multiplying, for each frequency, each point of a conjugate of a source wave field with a receiver wave field to obtain a result, then summing the results over all frequencies; computing, using a processor that communicates with the memory, propagation direction vectors of the source wave field and the receiver wave field, wherein the source wave field and the receiver wave field are propagated by the downward continuation Fourier domain shot record migration using the data of the reflected seismic waves and the propagation velocity field; and transforming the propagation direction vectors into propagation angles of the reflected seismic waves.