Tsunamis-5 Causes, 3 Hazards & 3 Prediction YouTube Lecture Handouts

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Tsunamis - 5 Causes, 3 Hazards & 3 Prediction


  • TSUNAMIS or tidal wave also known as a seismic sea wave is a series of waves in a water body.

  • Caused by the displacement of a large volume of water.

  • Generally occurs in an ocean or a large lake.

  • Speed of tsunami waves depends on ocean depth rather than the distance from the source of the wave.

  • It may travel as fast as jet planes over deep waters.

  • Only slowing down when reaching shallow waters.

Image of Tsunamis

Image of Tsunamis

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Image of Wave Movement

Image of Wave Movement

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Image of Deep Water And Shallow Water

Image of Deep Water and Shallow Water

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  • Intensity

    • Sieberg-Ambraseys scale

    • Imamura-Iida intensity scale

    • Where is average wave height along closest coast?

  • Magnitude

β„Ž is maximum tsunami-wave amplitude (in m) calculated by tide gauge at distance 𝑅 from epicenter, π‘Ž, 𝑏 & 𝐷 are constants


Image of Causes of Tsunamis

Image of Causes of Tsunamis

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  • It is an agent which has the potential to cause harm to a vulnerable target.

  • "Hazard" and "risk" used interchangeably.

  • Hence, in terms of risk assessment, these are two very distinct terms.

  • Classified as different types in several ways.


  • Prediction or forecast is a statement about an uncertain event.

  • It is often, but not always.

  • Based upon experience or knowledge.