This paper introduces the Japanese experience of the offshore tsunami profile observation. For the tsunami profile detection sensors, newly developed two systems are introduced: one is seabed installed Doppler-typed Wave Directional Meter (DWDM), and the other is the GPS Buoy Tsunami Gauge. Plan of the Round-Japanese-Coasts and Round-Indian-Sea Offshore Tsunami Monitoring Network is also introduced in the paper. Real-time data processing will be conducted at the Data Center. Satellite data communication system with self electric energy supply by the coastal wind-power-generators and battery should be applied to keep the continuous data communication without interruption in case where stable electric power is difficult to be obtained.
