TSUNAMI Part 1: Plate Boundaries and Tsunamis Most tsunamis form when an earthqu
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TSUNAMI Part 1: Plate Boundaries and Tsunamis Most tsunamis form when an earthquake occurs underwater. To create a tsunami, the earthquake needs to be large and move the seafloor up or down. Below are cross-section diagrams showing the movement as a result of earthquakes that occur at each of the plate boundaries. The large black arrows show the movement of the plate. 1. Label each diagram of a fault with the correct plate boundary at which it normally occurs divergent, convergent, or transform. sea level sea level sea level (out of page) into page) 2. The largest earthquakes occur when rocks are compressed. Which type of plate boundary experiences the largest earthquakes? divergent convergent transform 3. At which type(s) of plate boundary do earthquakes cause the seafloor to move up and down? divergent convergent transform 4. Using the two criteria described above, which diagram(s) above illustrates where a tsunami usually forms? divergent convergent transform 5. Two students are debating about where tsunamis usually form. Student 1: Tsunamis usually form only at convergent plate boundaries because that's the plate boundary where the largest earthquakes happen and the seafloor moves up or down during the earthquake. Student 2: I think tsunamis form at any plate boundary when any earthquake occurs under water as long as the earthquake is large enough. For example, California gets lots of earthquakes, and it is near the coast, so the San Andreas Fault, which is a transform fault, can cause a fsunami. With which student do you agree? Why? C W. H. Freeman and Company Lecture Tutorials for Earth Science 65Explanation / Answer
1.(i) Convergent :when two tectonic plates move towards each other.
(ii) Divergent: when two tectonic plates move away from each other.
(iii) Transform: when two tectonic plates move sliding one another
2. Convergent
3. Divergent
4. Convergent
5. Student 2. Because tsunami can occur any plate boundary. Tsunami is nothing but large earthquake under water.
6. Convergent: Plates moving eachother.
7.There is no movement before the earthquke in the circle, Because its lock zone , stress buildup at particular place before the earthquake, After the earthquake it will release.
8. When the earthquake occur in the ocean water is Tsunami, Rising and falling of ocean water levels.
9. Tsunamis occur most frequently in the Pacific, particularly along the Pacific Ring of Fire.
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