A basic examination of estimating the magnitude of TSUNAMI by T-wave

Paying attention to the sound of breaking sea bottom depending on the magnitude of TSUNAMI, we examined the acquisition of a sea sound wave at Japan waters. We considered the traveling route of the sea sound wave radiated from the hypocenter of the Tohoku-Pacific Ocean Earthquake, and estimated the propagation loss, which has a characteristic that the diffusion loss depending on distance is dominant. Thus, the sound pressure level of the hypocenter was presumed being at least 252 dB. (0 dB = 1u Pa). A sea sound wave radiation from the earthquake with the tsunami in Japanese waters is expected to attenuate the receiving about 55 dB at an area along the shore.