Retrieved 11 March Bibcode : AnRFM. See tsunami the japan Japanese earthquakes Seismicity of the Sanriku coast List of historical tsunamis Nuclear power in Japan, section Seismicity Nuclear and radioactive incidents. The scale of this wave was so much greater than ordinary tsunamis, it eventually led to the new category of megatsunamis. The phenomenon was also noted by media sources in Sri Lanka in the Indian Ocean earthquake.