11:00 AM - 11:15 AM
[HDS27-06] Construction of tsunami prediction system using tsunami amplification
Keywords:tsunami amplification, immediate prediction, DONET, Nankai Trough
Tsunami height strongly depends on the topography during tsunami preparation because the tsunami speed is expressed by a function of water bottom. Therefore, JAMSTEC had investigated the possibility for use of tsunami amplification for the tsunami prediction (Baba et al., 2013). With assurance of fault models, we calculated theoretical tsunami waveform for twenty DONET stations and targets of the coastal cities and got each maximum tsunami height. We selected Kushimoto town, Owase city, and Omaezaki city as first step of the system construction and constructed tsunami database including their tsunami waveforms and inundation maps. This system detects first arrivals of earthquake and tsunami using real-time DONET data, calculated average of absolute observed pressure values for twenty DONET stations, constructed a correlation profile between the average values and maximum tsunami height of each city, and select fault models changing the average values from the correlation profile. We introduce theoretical pressure waveform of the 1944 Tonankai earthquake and have considered method to make reduce the error of predicted tsunami height by this system. As a result, we found that it is important to select stations used for this system and fault models based on directions of detected events. In this presentation, we report concept of the tsunami immediate prediction system and future plan of the revise.