Earth tide
（重定向自Solid tide）
![Lunar tidal force: these images depict the Moon directly over 30° N (or 30° S) viewed from above the Northern Hemisphere, showing both sides of the planet. Red up, blue down.](/Images/godic/202502/12/Tideforcenw2805.jpg")
![](/Images/godic/202502/12/Tideforcese2805.jpg")
![Vertical displacements of sectorial movement. Red up, blue down.East-west displacements of sectorial movement. Red east, blue west.North-south displacements of sectorial movement. Red north, blue south.Vertical displacements of tessearal movement. Red up, blue down.East-West displacements of tessearal movement. Red east, blue west.North-South displacements of tessearal movement. Red north, blue south.](/Images/godic/202502/12/Sectorialvert2805.jpg")
![](/Images/godic/202502/12/Sectorialeastwest2806.jpg")
Earth tide (also known as body tide or bodily tides or land tides) is the displacement of the solid Earth's surface caused by the gravity of the Moon and Sun. Its main component has meter-level amplitude at periods of about 12 hours and longer. The largest body tide constituents are semi-diurnal, but there are also significant diurnal, semi-annual, and fortnightly contributions. Though the gravitational forcing causing earth tides and ocean tides is the same, the responses are quite different.