2010 Chilean Tsunami Observed on Japanese Coast by NOWPHAS GPS Buoys, Seabed Wave Gauges and Coastal Tide Gauges

摘要

The 2010 Chilean Tsunami was observed on the Japanese coast by 11 GPS buoys of NOWPHAS (Nationwide Ocean Wave Information Network for Ports and Harbours); these buoys measured the water level by using real-time kinematic GPS technology at a water depth of 100 to 300 m. The highest tsunami crest was 0.1 to 0.3 m, and the predominant period was longer than 50 min. Owing to the coastal bathymetry, tsunami components longer than 30 min at the GPS buoy sites appeared amplified to nearby seabed wave gauge sites at water depths of 30 to 50 m, and the shorter components of 10 to 20 min appeared significantly amplified at the coastal tide gauge sites.