Abstract
This paper introduced characteristics of the observed offshore waves and vertical buoy motions observed by the two sets of the GPS buoy installed at the Northern Pacific Coast of Japan. Wave heights are computed by observed vertical buoy motions obtained RTK-GPS systems. However, the vertical response characteristics of buoy motions are not taking into account the computation wave heights. Authors show observed wave height is not correct when significant wave period are less than 6.0 s. Then, in this study modified wave height is proposed taking into account the wave response characteristics of the vertical buoy motions when significant wave period are less than 6.0 s.
