The 11 March 2011 Tohoku earthquake (05:46:24 UTC) involved a massive rupture of the plate‐boundary fault along which the Pacific plate thrusts under northeastern Honshu, Japan. It was the fourth‐largest recorded earthquake, with seismic‐moment estimates of 3–5×1022  N·m (Mw 9.0). The event produced widespread strong ground shaking in northern Honshu; in some locations ground accelerations exceeded

The 2011 Tohoku event is the largest earthquake known to have struck Japan, a country having a very long documented earthquake history. Seismic‐hazard assessments based on instrumentally observed and historically documented events led most researchers to expect earthquakes no larger than...

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