OFFSHORE TSUNAMI MONITORING NETWORK DESIGN USING GPS BUOYS AND COASTAL ON-SITE SENSORS

摘要

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. Observed recent offshore tsunami profiles are introduced in the paper. These observation data prove that offshore tsunami observation is able to catch the exact tsunami characteristics several minutes before the tsunami arrives to the coast. Plan of the Round Japan Offshore Tsunami Monitoring Network is also introduced. Real-time tsunami profile detection data processing should be conducted at the Data Center. A newly developed real time tsunami detection numerical filter is also shown. Proposed method is confirmed with the recent observed offshore tsunami data obtained by DWDM and GPS buoy.