Abstract
Strong ground motions in the frequency range of 0.2-1 Hz observed along the east coast of Tohoku, Japan, from Miyagi to Ibaraki during the 2011 Tohoku earthquake are characterized by distinct pulses. The generation of such pulses is significantly important especially in the context of seismic design of structures. In this article, examples of strong-motion pulses from huge subduction earthquakes are presented and the relationships between the parameters of the SPGAs (Strong-motion Pulse Generation Areas) and the moment magnitude of the earthquakes are investigated.
