Coastal Processes FAQ – What are spring tides?
The term spring tide, an often misunderstood term, refers to the tides (both high and low) of maximum range that occur every two weeks when the moon is new or full. Spring tides occur every two weeks all year long. The term spring, when used to describe the tide, is not related to the season of the year, but rather the motion of the tide “springing up” or being greater than normal. Tides are caused by the gravitational attractions of the sun and moon on the ocean waters. Because it is closer to Earth, the moon is the more important force in producing tides. The gravitational attraction of the moon raises bulges of water both on the side of Earth toward the moon and, due to complex gravitational forces, on the side of Earth opposite from the moon. The moon revolves around Earth approximately once a month. When both the moon’s and the sun’s gravitational forces are in line (new and full moons), spring tides result. During spring tides the water level rises higher and falls lower than usu
