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Tsunami geology has been attracted attention after the 2011 Tohoku-oki tsunami and it is now directly linked to the national and local disaster mitigation plans. This paper reviews the response of the sedimentologists after the 2011 Tohoku-oki tsunami and the new findings observed through the emergency response surveys, and then discuss the future perspective of the tsunami geology research. Unfortunately, the sedimentological surveys were not well organized because of the confusing situation soon after the earthquake and tsunami disasters. Nevertheless, there are many important findings in terms of the relationship between the tsunami inundation distance and the maximum extent of the sediments, sediment sources, and geochemical estimation of the tsunami inundation distance. In order to understand the paleo-tsunami deposits, understanding of the tsunami deposits that were formed by the recent tsunami is very important and hence we must continue to correct the data through the emergency response surveys soon after the forthcoming tsunami events. For future emergency response surveys, sharing the survey information and organization of the survey teams by the related societies are required for the efficient correction of the field data. Tsunami geology needs to be improved with collaboration of the engineers and disaster scientists in the future. In addition, geoscience is required to be included in the disaster prevention education because the low-frequency large tsunami is occurred well beyond the human life span and hence it is very difficult to imagine for the public people for such events without the proper education.

Lessons learned from the 2011 Tohoku-oki tsunami and future perspective of the tsunami geology