Abstract: A first velocity model of a subsurface region, having first velocity values, and having a first spatial resolution is used to generate a reference travel-time model of reference travel-time values. A second velocity model of the subsurface region, having second velocity values is received. The second velocity model has a second spatial resolution that is higher than the first spatial resolution. The second velocity model is corrected with a corrected term, and the corrected model is processed to generate a candidate travel-time model of candidate travel-time values. The correction term is updated to minimize a measure of difference between the reference travel-time values and the candidate travel-time values, to obtain an updated correction term. The updated correction term is added to the second velocity model to obtain an updated second velocity model of the subsurface region.

Abstract: A method for processing seismic data includes obtaining a velocity model, determining a critical angle for an interface represented in the velocity model based on a ratio between velocity of the seismic wave on first and second sides of the interface, determining an orientation of a normal vector extending normal to a location of the interface, determining an orientation of an arrival direction vector of a wavefield at the location of the interface, calculating an angle between the normal vector and the arrival direction vector, determining that the angle between the normal vector and the arrival direction vector is greater than the critical angle at the location, and attenuating the wavefield associated with the location in response to determining that the angle between the normal vector and the arrival direction vector is greater than the critical angle at the location.

Abstract: A method for processing seismic data includes obtaining a velocity model, determining a critical angle for an interface represented in the velocity model based on a ratio between velocity of the seismic wave on first and second sides of the interface, determining an orientation of a normal vector extending normal to a location of the interface, determining an orientation of an arrival direction vector of a wavefield at the location of the interface, calculating an angle between the normal vector and the arrival direction vector, determining that the angle between the normal vector and the arrival direction vector is greater than the critical angle at the location, and attenuating the wavefield associated with the location in response to determining that the angle between the normal vector and the arrival direction vector is greater than the critical angle at the location.

Abstract: A method for generating an illumination map. The method includes receiving an earth model that represents one or more properties of the earth. The method then includes receiving a target area in the earth model and propagating one or more wavefields from the target area to a potential seismic data acquisition region in the earth model. After propagating the wavefields, the method includes decomposing the propagated wavefields into one or more subsets of the propagated wavefields and creating the illumination map based on the subsets of the propagated wavefields. The illumination map may indicate one or more contributions of one or more synthetic source and receiver pairs for illuminating the target area in the earth model. The method may then include creating a seismic survey design based on the contributions.

Abstract: A method for generating an illumination map. The method includes receiving an earth model that represents one or more properties of the earth. The method then includes receiving a target area in the earth model and propagating one or more wavefields from the target area to a potential seismic data acquisition region in the earth model. After propagating the wavefields, the method includes decomposing the propagated wavefields into one or more subsets of the propagated wavefields and creating the illumination map based on the subsets of the propagated wavefields. The illumination map may indicate one or more contributions of one or more synthetic source and receiver pairs for illuminating the target area in the earth model. The method may then include creating a seismic survey design based on the contributions.