1. A method for determining time-varying stress and strain fields within a subsurface region, the method comprising: integrating a seismic model of a reservoir within the subsurface region with a geomechanical model of the subsurface region; and determining an estimate of the time-varying stress and strain fields within the subsurface region during production of the reservoir, wherein the estimate is based on the integration of the seismic model with the geomechanical model.