Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:While simple, this model captures the basic observation that crustal deformation during the seismic cycle consists of coseismic elastic deformation followed by postseismic viscoelastic adjustment of the lower crust [e.g., Savage and Prescott, 1978; Segall, 2002] and has been successfully employed to provide first-order estimates of fault zone and lower-crustal properties in other regions [e.g., Segall, 2002].
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