1. A method comprising: receiving a first dataset indicative of seismic data acquired in a seismic survey of a field of wells; receiving a second dataset indicative of wellbore data acquired in a wellbore survey conducted in at least one of the wells; and determining a mechanical earth model including rock deformation and strength properties for the field based at least in part on the seismic data and the wellbore data using at least one processor, including using the seismic data and the wellbore data to spatially distribute at least one rock mechanical property over a region of the field in the model where wellbore data is sparse or non-existent.