Part 1: Tsunamis Tsunamis are rare events - but are responsible for many deaths
ID: 118147 • Letter: P
Question
Part 1: Tsunamis Tsunamis are rare events - but are responsible for many deaths and considerable destruction when they occur. In this assignment you will explore historic tsunamis. Go to: https:/imaps.ngdc.noaa gov/viewers/hazards/layers 0. The default settings for this interactive tool show the location of the epicenter of all ocean movements that have generated tsunamis in the historic record. 1. What is the relationship between tsunami sources and plate tectonies? In the drop down box near the bottom of the memu select the 2011 Tohoku, Japan tsunami Make sure the Tsunami Travel Times and RIFT Tsunami Energy boxes are checked. The red dot shows the source of the tstunamt. Colors indicate wave energy. Vertical bars show the high of the wave. 2. Describe the spatial pattern of energy propagation. What areas around the Pacific were hit by the most wave energy and highest waves? 3. How much warning did these areas have? Check the DART Deployments box. Click on the Question Mark to get information about DART 4. Explain why you think the DART sensors are deployed where they are. Next let's look at a tsumami generated on the other side of the Pacific. Select The 1700 Cascadia Subduction zone. S. What areas were most impacted by this tsunami? 6. Compare the the Cascadia event with the Japan event. How do they differ? Now let's look at a tsunami in the Atlantic. Select the 1755 Lisbon Portugal event 7. Describe what areas were most impacted by this tsunami? How much warning would these sites have had (if they had had today's technology) Toggle the DART button on and off, noting where DART stations are located in the Atlantic. What does this suggest about tsunami risks in the Atlantic? 8.Explanation / Answer
SOLUTION:-1
Earthquakes happen when two of the earth's plates subduct under one another, if this happens under a large mass of water such as the sea, the force of the earthquake will then cause a tsunami. it can be generated when the sea floor abruptly deforms and vertically displaces the overlying water. Such large vertical movements of the Earth’s crust can occur at plate boundaries. Subduction earthquakes are particularly effective in generating tsunami. Tectonic plates movement is nothing but resultant of erathquake which causes displacement of seafloor.