ABSTRACT In 2016, a countermeasure against the Nankai trough long‐period and long‐duration ground motions (LPGMs) was announced. However, the response spectrum method (RSM), indicated by the Ministry of Construction notification Vol. 2009, is out of countermeasure. For example, when RSM is used as the waveform of LPGMs published in countermeasure, it tends to overestimate the velocity response of the seismic isolation interface. In this study, we propose a method of evaluating the velocity response of the seismic isolation interface based on the periodic characteristics of the design response spectra for LPGMs.
Kobayashi et al. (2026) studied this question.