The Mw=9.0 Tohoku Japan Earthquake (March 11, 2011) tsunami impact on structures and infrastructure

The March 9th 2011 earthquake of Mw=9, that occurred offshore NE Japan, triggered major tsunami waves that affected almost all of the NE coast of Japan and caused massive casualties and enormous disasters. On the affected areas great damages were observed on structures and infrastructure, not because of the earthquake, but mainly because of the tsunami waves that literally swept whole residential, industrial and rural areas. Below, preliminary field observations on the behaviour of different types of structures, ports and critical infrastructure in general are presented and the causes of disaster are analyzed. Finally, comparisons are made with the damage caused by the tsunami waves of Indian Ocean of December 26th, 2004.