The SITE module solves the site response problem. The input file has extension .sit and it is created by the AFWRITE command. The control point and wave composition of the control motion has to be defined in the input files. The information needed to compute the free-field displacement vector used is computed and saved on disk in FILE1.

The SITE program also stores information required for the transmitting boundary calculations in FILE2. The actual time history of the control motion is not required in this program module, but later in the MOTION module. In addition to the output and binary files FILE1 and FILE2.