Earthquake Ground Motion Earthquake Ground Motion is explained in detail under this title. Earthquake Ground Motion Levels Spectral Response Acceleration Parameters. Site Class and Site Coefficients Horizontal Design Response Spectrum Vertical Design Response Spectrum Design Spectrum for Site-Specific Ground Motion Earthquake Ground Motion Records in Time History Next Topic Earthquake Ground Motion Levels Related Topics General Ultimate Strength Design Principles (USD) Concrete Element Design Building Base and Building Height Building Height Category