The National Oceanic and Atmospheric Administration (NOAA) has a real-time Tsunami Warning Center. Read the map FAQ section on this page to learn what the different icons on a tsunami map represent. Why is it important for the center to have three categories: no watch, warning, and advisory?

Tides are caused by a differences in the gravitational force of the sun at different points on earth. differences in the gravitational force of the moon at different points on earth differences in earth’s gravitational field strength at different points on earth’s surfac fluctuations in the gravitational attraction between earth and the moon.