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We analyzed the process decay of tsunami waveform based on the observed one due to the 2011 Tohoku-Oki earthquake. The observed waveforms at 31 stations along the Pacific coast of Japan were divided into four domains with periods and were evaluated respectively for each physical parameter such as the arrival time, the amplification time of tsunami of the later phase, the maximum tsunami amplitude of the later phase and the decay time. We found out that the decay time of the long period component is generally longer than the short period, but in some cases the time of short period component becomes longer than the others, which may be affected by radiation wave due to large scale bathymetric structure such as the Emperor seamount.

Decay Process of the Tsunami due to the 2011 Great off the Pacific Coast of Tohoku Earthquake along the Pacific Coast of Japan