1.4 Tsunamis Quinn and ColePresentation Transcript
Quin and Cole
Tsunamis are ocean waves, that can reach the height of 100 feet, and crash onto land.
Japanese word that means “harbor wave”.
80 percent of all tsunamis take place in the Ring of Fire, in the Pacific Ocean.
Tsunamis can travel at speeds up to 500 miles, or 805 km. per hour.
Tsunamis start out the same speed and height of a regular wave, but then the wave slows down and gains height.
The top of the wave moves faster then the bottom of the wave.
Tsunamis usually happen in series of waves.
How Tsunamis Form
Waves are caused by
underwater earthquakes at
Forms at a convergent boundary.
Seduction zones underwater start most of the tsunamis.
Can also be caused by erupting volcanoes, landslides, or even meteorites that land in the Ocean.
In 1200, a volcano in Sicily, Italy exploded causing major tidal waves covering the whole Mediterranean Sea. Scientists have the evidence to prove this.
In November 1755, a giant earthquake destroyed Lisbon, Portugal. This triggered a tsunami and fires The earthquake, tsunami, and fires killed 60,000 people.
On August 27, 1883, the Krakatoa Volcano in Indonesia started a tsunami that killed 36,000 people.
Major Tsunamis Cont.
On June 15, 1896, 100 foot waves killed 27,000 people in Japan. It was started by an earthquake in the ring of fire.
On April 1, 1946, a tsunami hit Hawaii, killing 159 people. It was caused by an earthquake in Alaska.
On July 9, 1958, the largest tsunami ever recorded hit Alaska in the Lituya Bay. Waves were as high as 1,720 feet. Because the area is unpopulated, no damage was done, and only two people were recorded to be dead.
More Major Tsunamis
On May 22, 1960, a magnitude 8.6 earthquake hit Chile, triggering a tsunami just 15 minutes after the earthquake, killing 1,500 people.
On March 27, 1964, an earthquake hit Alaska, causing a 200 foot tsunami traveling at about 400 mph. The tsunami killed 120 people, and the tsunami was so strong, California got waves over 20 feet, causing 10 deaths.
On August 23, 1976 a tsunami killed 8,000 people in the Philippians after an earthquake.
On July 17, 1998, a 7.1 earthquake hit Papa New Guinea, triggering a tsunami that killed about 2,000 people.
On December 26, 2004 a 9.2 earthquake started a tsunami in Indonesia that killed 230,000 people.
Watch for tsunami warnings in coastal areas.
Know and evacuation route, and go to higher ground.
Tsunami warning signs:
1. Rising or falling coastal waves
2. Rumblings of an offshore earthquake.
Don’t stay to watch the tsunami.
A tsunami is a series of waves. Do not return to costal