Presentation on theme: "WAVES disturbance caused by the movement of energy from a source through some medium (solid, liquid or gas). THERE ARE MANY DIFFERENT SIZES AND SHAPES."— Presentation transcript:
WAVES disturbance caused by the movement of energy from a source through some medium (solid, liquid or gas). THERE ARE MANY DIFFERENT SIZES AND SHAPES OF WAVES
Deep vs Shallow Water waves The orbits of water molecules in a wave are circular only when the wave is in deep water A wave cannot “feel” the bottom if it is in water deeper than ½ its wavelength = a deep water wave
Types of Waves Tsunamis – long wavelength, shallow water progressive waves caused by rapid displacement of ocean water. This is caused by sudden vertical movement of earth along a fault line, causing a Seismic Sea Wave. Origination on seafloor, a “problem” for continental populations if this is close to land or in a confined space!
Tsunami A tsunami can be a wave w/ a wavelength up to 125 miles! Remember the deepest ocean basin is 7(+) miles deep…if a wave = ½ wavelength it’s still not enough “room” to move (do the math!) Problem: a tsunami wave can reach a height of over 100’
Tsunamis originate from earthquakes, volcanic explosions, or submarine landslides. On December 26, 2004, an earthquake with a magnitude of over 9.0 on the Richter scale triggered a megatsunami that affected coastlines throughout the Indian Ocean.