Abstract
This paper introduces development and improvement of the Japanese offshore tsunami profile observation system using seabed installed acoustic wave sensor network named as NOWPHAS (NOWPHAS: Nationwde Ocean Wave network for Ports and HArbourS). Recent observed tsunami profiles caused by the 1993 Hokkaido-Southwest-Off Earthquake, 1994 Hokkaido-East-Off Earthquake, and the 2003 Tokachi-Off Earthquake were introduced. Development of the new wave gauges including the DWDM (Doppler-type Wave Directional Meter) and the new GPS buoy system was described. New NOWPAHS data communication system design using the internet network was also shown.
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