PROPAGATION OF 2010 CHILEAN TSUNAMI INTO RIVERS IN TOHOKU DISTRICT -TSUNAMI INTRUSION AND RIVER MOUTH MORPHOLOGY-

Abstract

Serious Chilean Earthquake, rating magnitude of 8.8, occurred on February 27, 2010, and caused large tsunami waves in the Pacific Ocean after that. The main objective of this study is to investigate the tsunami wave propagation into rivers with different morphologies based on a range of details measurement data sets from 20 rivers. The analyzed results show that the tsunami wave can affect up to 22km upstream of river at the most. Furthermore, it is observed that there exists distinct difference of tsunami height in the river dependent on the different river mouth morphology. Thus, classification of the rivers has been proposed based on the rank of rivers and river mouth morphology.