Abstract
Attenuation relations of earthquake ground motion are used for seismic hazard and risk analyses and therefore it is necessary to develop them based on observed data. Recently the JMA intensity scale was revised and large number of seismometers measuring the intensity were deployed throughout Japan. In this study, the new JMA intensity scales are calculated for the strong ground motion data set with 2, 166 three-component records obtained by the JMA-87-type accelerometers. Then an attenuation relationship for the JMA Intensity is developed and examples are presented.
