DReW Seismic employs the method developed by Conte, Pugliese and Troncone (2022), which calculates the wall rotation (and, consequently, the corresponding displacement) in the time intervals when the ground acceleration exceeds a critical threshold. This latter is assumed to be variable during the seismic event, as explained here.
After the calculation has finished, DReW Seismic shows the comparison between the input ground acceleration and the calculated critical threshold, which will look like the following figure.
Comparison between the input ground acceleration and the calculated critical threshold