Abstract
The 2011 Tohoku earthquake and tsunami caused widespread and serious damage especially to coastal areas in the Tohoku region. While a number of hydrographic observation facilities were damaged, there exist movies capturing tsunami propagation and inundation, which are considered to be useful for obtaining hydrographic properties of tsunami behaviors. In this study, we tried to estimate time series of velocities of the tsunami in Ofunato Bay, using a movie that captured the first tsunami wave attack. Time series of the original images were converted to separate images of brightness values and then their distortion corrections were made using our field survey data. Finally, we obtained temporal and spatial distributions of the tsunami induced currents in Ofunato Bay.
