Naoshi Hirata, a professor emeritus at the University of Tokyo who chairs the JMA’s Nankai Trough earthquake assessment study group, said at a news conference on Aug. 9, “At this point ...

The vertical distance between a crest and a trough is 52 cm and 20 waves pass the boat in 30 seconds. 1. The amplitude of a wave is the maximum displacement of a point of a wave from its rest ...