1. A method for determining a model of a physical property in a subsurface region from inversion of seismic data, acquired from a seismic survey of the subsurface region, or from reverse time migration of seismic images from the seismic data, said method comprising determining a seismic resolution volume for the physical property and using it as a multiplicative scale factor in computations performed on a computer to either convert a gradient of data misfit in an inversion, or compensate reverse-time migrated seismic images, to obtain the model of the physical property or an update to an assumed model.