Abstract
The long-period ground motion class of Japan Meteorological Agency (JMA), which is divided into four classes depending on the maximum velocity response spectrum, is tried for the long-period ground motion, though the seismic intensity scale of ten classes based on the instrumental seismic intensity is used. The present study proposes the long-period ground motion class by using a long-period seismic intensity level to have an intermediate characteristic of the velocity and the displacement. The long-period seismic intensity level based on the seismic intensity level is obtained for the maximum value to have the correlation between the long-period ground motion class of JMA. Not only a design long-period ground motion waveform but also observed seismic waves are used for comparison with the long-period seismic intensity level and various seismic intensity levels, maximum velocity response spectrum.
