Educação Superior::Ciências Exatas e da Terra::OceanografiaEnsino Médio::GeografiaThis image shows features of the ocean floor depth (or bathymetry) from NOAA’s ETOPO-1 dataset. It shows the eastern coast of Japan, which abruptly rise out of the ocean. This feature enhances the power of the tsunami waves. As these waves approaches the coast, the shallowing ocean floor pushes the water mass upwards. The quicker the ocean floor transitions from deep to shallow, the greater potential for a higher wave height. The islands and mountain ranges throughout the ocean also affect the tsunami travel time and speed. In the open ocean, tsunamis can travel at speeds up to 500 mph (800 kph). This momentum is what creates such a destructive force as the wave moves inland