Waves.

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Presentation transcript:

Waves

Wave Structure Amplitude

What is a Wave? The transmission of energy through matter Water, sound and light Most water waves are caused by wind

Waves Water waves travel from the ocean to the coast by transferring energy from one water molecule to the next.

Did You Know? Waves crash offshore when the height exceeds 1/7th of the wavelength Result = whitecaps

Waves rise right before crashing on the beach because friction slows the wave and packs its energy into a tighter area.

Waves Cont’d Storm Surge Tsunami Forms when high winds push water against the shore Tsunami Caused by sudden water displacement from landslide, iceberg falling, a volcanic eruption, or earthquake

Tsunami

What is a Tsunami? A destructive wave caused by a sudden water displacement. Causes: earthquakes (most often) but also landslides, volcanic activity or (rarely) by meteor impact

FYI In the deep ocean, a tsunami wave may only be a few cm high, but may reach speeds of up to 700km/hr Due to their long wavelengths, tsunamis lose little energy as they travel

Monitoring Detection buoys around the world observe and record changes in sea level in the deep ocean Transmit info via satellite Upon receipt of tsunami warning messages Emergency Mgmt Officials send out messages to TV, radio, etc.

Indonesia (Dec 29, 2004)

9.1 Magnitude Earthquake 3rd most powerful quake ever recorded Longest duration of faulting ever observed at 8.3-10 minutes It caused the entire planet to vibrate and triggered additional earthquakes as far away as Alaska 230,000 people died in 14 different countries

After the Tsunami Dive boats CNN Article What washed up? Pics!

Japan (March 11, 2011)

9.0 Magnitude Earthquake off the coast of Japan 5th most powerful earthquake recorded Waves reached up to 133ft Caused 3 nuclear reactors to melt down and people within 50 miles were told to evacuate

After the Tsunami Nuclear Reactors Video Clip (2:30) Debris - Tsunami Aftermath: Marine Debris

Article: After the Tsunami, Japan’s Sea Creatures Crossed an Ocean How were so many organisms able to survive the trek across the Pacific to the West Coast of the U.S.? How was it possible for these invasive organisms with short life spans to survive the journey? Why are scientists most concerned with the organisms from Japan making their way to our coast?