The highest class 7 of was recorded in Kurihara-city, Miyagi prefecture. As a result of such motions, many impacts occurred on artificially reclaimed lands, soft alluvial plains, and fragile slopes. This is a precious record obtained at a central position in the severely damaged region.
This paper considers why this tragedy occurred, and what unrecognized factors contributed to the high vulnerability of the area.
To assist in answering such questions, this paper presents a timely report of the features of the earthquake and tsunami, the damage they caused, and the early efforts for recovery and reconstruction. Furthermore, tsunami waves extended up along a river and flooded over river dikes in the middle and upper reaches.
Secondary effects then resulted, including on the physical and psychological conditions of refugees. This results in smaller effects on the structure of buildings. Very large wave heights occurred along southern Aomori, Iwate, Miyagi and northern Fukushima Prefectures. Since many areas are still left uninvestigated, the number is expected to increase.