Patent ID: 8825410

Claim:
A processor implemented method for processing seismic data including measurement data and gradients of the measurement data for a geophysical survey, comprising: receiving the measurement data from a plurality of seismic receivers, the plurality of seismic receivers are arranged along a seismic streamer configured in use to be towed behind a boat through a body of water and the plurality of seismic streamers comprise geophones and/or hydrophones, and wherein the receivers are configured to measure seismic energy generated by an interaction between a seismic signal produced by a seismic source and a subterranean section of the earth; using a non-transitory computer readable medium containing computer instructions stored therein, for causing a computer processor to perform the following processes: deriving gradients of the measurement data; deriving a first term by applying a move-out correction function to the measurement data, wherein the move-out correction function is configured to compensate for offset between the seismic source and the seismic receivers and comprises a velocity function selected to match a velocity of the seismic energy traveling through the earth and the body of water; deriving a second term by applying the move-out correction function to the gradients; and deriving gradients of move-out corrected data by adding the first term and the second term.