tsunamipresentation.ppt

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tsunamipresentation.ppt

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Slide 1: 

9/5/2008 Cataclysms And Catastrophes: Tsunamis!

Vista TopicTsunamis – Walls of Water : 

9/5/2008 Vista TopicTsunamis – Walls of Water Vista Overview A tsunami is a series of water waves generated by a disturbance in the ocean. Compared to other water waves, tsunamis have long wavelengths and long periods which gives tsunamis waves greater amplitude and energy than other water waves.

Background:Tsunamis Generation : 

9/5/2008 Background:Tsunamis Generation Tsunamis sources displace the water column in the ocean Gravity then acts to restore displaced water A wave is generated that travels as an expanding ring across the ocean’s surface

Tsunamis Wave Propagation : 

9/5/2008 Tsunamis Wave Propagation

PNG Tsunami- Sissano Lagoon : 

9/5/2008 PNG Tsunami- Sissano Lagoon Source: www.usc.edu/dept/tsunamis/PNG/sissano.html

Asian Tsunamis- 12/26/04 : 

9/5/2008 Asian Tsunamis- 12/26/04

Slide 7: 

9/5/2008 Asian Tsunamis- 12/26/04. Tourists flee a beach in Thailand. Source: The New York Times

Learning Activities : 

9/5/2008 Learning Activities Understanding tsunamis and their sources with focus on asteroid impacts. Using wave energy, velocity, and height to demonstrate tsunami wave characteristics Tsunami prediction and creating a tsunami hazard map

Activity 1Tsunamis Sources : 

9/5/2008 Activity 1Tsunamis Sources Earthquakes account for about 90% of all tsunamis Landslides Volcanic eruptions Escaping gas hydrates Impacts such as asteroids and ice berg chunks

The Seismogenic Zone: One Example : 

9/5/2008 The Seismogenic Zone: One Example

Slide 11: 

9/5/2008

IRIS Seismic Monitor : 

9/5/2008 IRIS Seismic Monitor

Slide 13: 

9/5/2008

Slide 14: 

9/5/2008 Source: Figure provided by Seth Stein, Professor, Department of Geological Sciences, Northwestern University, Evanston, IL 60208

Impact Sources : 

9/5/2008 Impact Sources

Activity 2Wave Characteristics : 

9/5/2008 Activity 2Wave Characteristics A tsunami wave is a shallow-water wave Water depth affects speed and amplitude of the wave Energy remains nearly constant

Wave Calculations : 

9/5/2008 Wave Calculations Velocity v = (g * d)1/2 Amplitude As/Ad = (Vd/Vs)1/2

Tsunami Wave Trough : 

9/5/2008 Tsunami Wave Trough

Activity 3Tsunami Prediction and Hazard Map : 

9/5/2008 Activity 3Tsunami Prediction and Hazard Map Overview of the warning systems like WCATWC Use of tide gauges Use of seismometers Map the hazard zone of a costal area for a particular tsunamis event

Can tsunamis occur close to home? : 

9/5/2008 Can tsunamis occur close to home? Source: http://www.whoi.edu/home/index_pr_tsunami.html (Illustration by Jack Cook, Woods Hole Oceanographic Institution)

Slide 21: 

9/5/2008 Source: http://www.whoi.edu/home/index_pr_tsunami.html