The 2011 Tōhoku earthquake and tsunami was a 9.0-magnitude earthquake followed by tsunami waves. It was measured at 8.4 on the JMA seismic intensity scale The earthquake happened 130 kilometres (81 mi) off Sendai, Miyagi Prefecture, on the east coast of the Tōhoku of Japan, on March 11, 2011 at 05:46:23 UTC.It was at a depth of 24.4 km (15.2 miles). …
https://simple.wikipedia.org/wiki/2011_T%C5%8Dhoku_earthquake_and_tsunami