The 11 March 2011 Tohoku-oki tsunami

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Australian Nuclear Science and Technology Organisation
The 11 March 2011 MW9.0 megathrust earthquake that occurred on the Japan Trench boundary off the East Coast of Japan, generated a devastating tsunami that affected not only over 2000 km of Japan’s Pacific Coast, but also other coasts in the Pacific Ocean. The tsunami reached more than 5 km inland in some areas of the low-lying Sendai Plain, with a maximum inundation height of 19.5 m. On the Sanriku coast 50 to 200 km further north, a maximum run-up height of 40.0 m was recorded. The tsunami resulted in nearly 15,900 dead and 2,900 missing, and caused extensive damage to houses, buildings and all types of infrastructure, also leading to the Fukushima Daiichi nuclear disaster. The size and extent of the 2011 Tohoku-oki tsunami were much larger than expected. This is largely due to the fact that the magnitude of its predecessor, the 869AD Jogan tsunami, was underestimated. An overview of the tsunami impact will be presented, as well as a discussion about lessons learnt from this event for future hazard preparedness.
Tsunamis, Japan, Geologic deposits, Coastal regions, Natural disasters, Reactor accidents, Hazards, Pacific Ocean
Chagué-Goff, C. (2012). The 11 March 2011 Tohoku-oki tsunami. Paper presented to the 12th South Pacific Environmental Radioactivity Association Conference (SPERA 2012), Sydney, Australia, Tuesday 16 October – Friday 19 October 2012. Lucas Heights, NSW: Australian Nuclear Science and Technology Organisation. (pp. 16).