[J04-4] Geohazard early warning systems IV

[J04-4-05] Rapid estimation of tsunami source location based on Tsunami Centroid Location (TCL) using NIED oceanfloor observation networks

^○Naotaka Yamamoto, Takeshi Nakamura, Shin Aoi, Wataru Suzuki, Narumi Takahashi (National Research Institute for Earth Science and Disaster Resilience, Tsukuba, Ibaraki, Japan)

A rapid method of estimating tsunami source locations using real-time ocean-bottom hydrostatic pressure data from a dense offshore observation network has been proposed (Yamamoto et al., GRL, 2016). In this method, we calculate a characteristic location representing the real-time tsunami disturbance called tsunami centroid location (TCL), which is the centroid location of the maximum absolute amplitude of the real-time ocean-bottom hydrostatic pressure changes. The TCL could approximate the tsunami source centroid location, which is the weighted center of the absolute values of the initial sea surface height displacements and presents the approximate tsunami source location. In this presentation, we report whether the TCL can approximate the centroid location of the tsunami source by examining various near-field synthetic tsunami scenarios and several observed micro tsunamis from NIED oceanfloor observation networks; Dense Oceanfloor Network system for Earthquakes and Tsunamis (DONET) and the Seafloor Observation Network for Earthquakes and Tsunamis (S-net). In addition, we propose the method of real-time forecast for the arriving time on the target coastline using the TCL in order to issue the lead-time for citizens on the coasts.