Abstract
Two years have passed since the 2011 Tohoku earthquake and tsunami. While reconstruction progresses steadily, a need for new concepts for tsunami prevention is realized. The concepts however, are currently left in the hands of the local governments, each with a general goal of disaster mitigation but lacking in some universal risk base. With this problem in mind, this paper proposes the concept of critical interlock - stopping processes before fatal damage can be done. Using this concept, existing or planned tsunami prevention measures are analyzed.
