Acoustical properties of T-waves generated by 2011 Tohoku earthquake

T-wave is an underwater acoustic wave generated by submarine earthquake and propagated to a long distance through the SOFAR channel. T-wave can be received by a hydrophone located in the minimum sound velocity layer of the SOFAR channel, and thus can be applied to the detection of submarine earthquake. In this study, the T-waves received by hydrophones installed at International Monitoring System hydroacoustic station, HA11 after being generated by 2011 Tohoku earthquake was analyzed to investigate the possibility of early tsunami warning. The station HA11 is located near Wake Island, about 3100 km from the epicenter of the Tohoku earthquake. Transmission losses as a function of frequency were predicted using a range-dependent acoustic model, RAM and used to predict the source spectral density of the T-wave. The results presented in this talk may be applied to the tsunami early warning system. [This research was supported by the Korea Meteorological Institute (Grant No. KMI2018-02510).]