Use the following procedure to define the seismic hazard per FEMA 356.

1. On the  Loading ribbon tab, select the  Pushover tool in the Define Loading Systems group. The Create New Definitions / Load Cases / Load Items dialog opens with only the Pushover tab displayed.
2. Select the Define Spectral Details tab.
3. Specify up to four Critical Damping values for the 1st through 4th spectra. At least one is required, which has a default value of 5.0%.
4. (Optional)  Select the Site Category Site Class D is used by default.
5. Specify the Mapped Spectral Acceleration At Short Period, S_s, to be used per Table 1-4 of FEMA 356.
6. Specify the Mapped Spectral Acceleration At One-Second Period, S₁, to be used per Table 1-5 of FEMA 356.
7. Click Add.