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