Accurate seismic images and depth models are essential in hydrocarbon exploration and production. The Aspen GeoDepth velocity determination and modeling system offers a solution for improved seismic imaging in time or depth through the integration of interpretation, velocity analysis, model building, time-to-depth conversion, depth migrations and model verification and updating. Aspen GeoDepth supports the entire range of seismic surveys, including 3D and 2D marine and land surveys, and narrow and wide-azimuth acquisition geometries, covering every type of geological structure in the world.