Parameters of a structure seismic analysis depend on a seismic code used during calculations of a structure influenced by seismic impact. Romanian seismic code P100-92 in the New Case Definition dialog or click Parameters in the Analysis Type dialog.
To complete the seismic analysis according to the rules given in a code, define the following parameters:
In the lower part of the dialog, the Direction definition and Filters buttons are located.
The details concerning this structure analysis method can be found in the mentioned code.