- Khin Thu Thu Han
( 22BSIT002 )
Foundation course on Math & Physics
BSIT (div 1) [ CMPICA ]
22 . 3 . 23

• What is Tsunami ?
• Formation of Tsunami
• Physics behind them
• Characteristics & Examples
• Detection
• Prevention
• References

• Its a series of water waves caused by the displacement of
a larger volume of a body of water,usually an ocean
• Japanese --> tsu ( harbour ) ... nami ( waves )
• Wave lengths can be 100-1000km apart
• Waves can approach shore in 5 minutes intervals
• Time between each wave is 5-60 minutes

• Volcanic Eruption
• Earthquake
• Meteorite impacts
• Underwater explosion

g = acceleration due to gravity ( 9.8m/s2)
c = shallow - water wave at a speed
( depend upon the water depth )
h = depth of water
𝑐 = 𝑔ℎ

In a deep ocean, the typical water depth is around
4000m so ....
𝑐 = 𝑔ℎ = 4000 ∗ 9.8 = 200 m/𝑠2
so tsunami will travel around 200 m/s2 or
more than 700 km / h

wave height :
The amount by which the sea-floor displaced.
wavelength and period :
size and shape of underwater disturbance
FOR TSUNAMI THAT ARE GENERATED
BY UNDERWATER EARTHQUAKES

This Photo by Unknown Author is licensed under CC BY-SA

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• 2004 Indian Ocean Tsunamis
• one of the deadliest natural disasters in
history
• killing over 200,000 people throughout Asia

Preparation

References
How to Prepare for a Tsunami: 15 Steps – wikiHow2
https://www.bing.com/ck/a?!&&p=f427d53b74105877JmltdHM9MTY3OTM1NjgwMCZpZ3VpZD0wYmE0M2ViZi0zMD
ExLTY3NmEtM2IwOC0yY2JkMzE3NTY2N2UmaW5zaWQ9NTIwNw&ptn=3&hsh=3&fclid=0ba43ebf-3011-676a-3b08-
2cbd3175667e&psq=physics+behind+tsunami&u=a1aHR0cHM6Ly9uaG11LnV0YWguZWR1L3NpdGVzL2RlZmF1bHQvZ
mlsZXMvYXR0YWNobWVudHMvQWxsJTIwQWJvdXQlMjBUc3VuYW1pcy5wZGY&ntb=1
Tsunami – Wikipedia
https://sos.noaa.gov/videos/japan_tsunami_400.mp4
Animation of Earthquake and Tsunami in Sumatra – YouTube
Australia's tsunami detection system – YouTube
Animation of Earthquake and Tsunami in Sumatra – YouTube
Tsunami caused by volcanic sources - YouTube

Thank You