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Weather and Climate

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When does it occur?Larger tsunami happen about 6 times per 100 years. They happen when there are earthquakes or major explosions under water also from landslides.


What is a Tsunami?A tsunami is like a tidal wave. The wavelenght of a tsunami wave is much longer than a normal tidal wave. Waves can be over 100 feet.

How is it created?A tsunami is a lot of waves created by a large amount of wind, water tides and displaced water from under water explosions.

Where do Tsunamis happen?Tsunamis are most common in the Pacifc Ocean, Australia and Indonesia. These areas have a high number of earthquake zones.

How do Tsunamis effect people?Tsunamis can wipe out homes, stores, schools, roads and modes of transportation. People can be left homeless for many months or even worse be killed by the waves and water pressure from a tsunami.

How do Tsunames effect our physical environment?Tsunamis can drown forests and kill plants. Animals can be left without homes on land and in the ocean, plus the ocean can be poluted from the land where the tsunami came from.

Interesting Facts!- About 80% of tsunamis happen within the Pacific Ocean.- The Indian Ocean tsunami that hit Indonesia in 2004 killed over 200,000 people.- In 2011 the tsunami that hit Japan killed 15000 people.- Tsunami is a Japanese word that means 'harbor wave'.

Tsunami are waves caused by sudden movement of the ocean due to earthquakes, landslides on the sea floor, land slumping into the ocean, large volcanic eruptions or meteorite impact in the ocean.

Ocean-based sensors. In the moments after an earthquake, seismologists consult pressure sensors on the ocean floor to determine whether there has been an increase in the height of the column of water directly above—a change that indicates a tsunami. They then consult topographical maps to predict, based on historical data and mathematical models, how quickly and powerfully the tsunami might impact various parts of the world. Seismologists issue a "warning" if a tsunami has been detected and is likely to head for a given landmass. Evacuation and repositioning of ships are usually ordered. A "watch" means a tsunami has been detected far from the landmass, and forecasters are tracking the wave to see if it has the potential to cause damage. Evacuation is put on hold until more information is gathered. An "advisory" means that damage is likely to be minimal and minor actions like beach closures are advisable.

How do you spot a Tsunami?WAVE SPEED - Normal is 4.8-60, Tsunami is 480-600 miles per hourWAVE PERIOD - Normal is 5-20 seconds, Tsunami is 10 minutes to 2 hoursWAVE LENGTH - Normal is 330-660 feet, Tsunami is 60-300 miles

Most tsunamis, about 80 percent, happen within the Pacific Ocean's “Ring of Fire,” a geologically active area where tectonic shifts make volcanoes and earthquakes common. Tsunamis may also be caused by underwater landslides or volcanic eruptions.

The tsunami bomb was an attempt during World War II to develop a tectonic weapon that could create destructive tsunamis. The project commenced after US Navy officer E.A. Gibson noticed small waves generated by explosions used to clear coral reefs. The idea was developed by the United States and New Zealand military in a programme code named Project Seal.[1]


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