Tsunamis are a secondary effect of earthquakes...
You must know a case study of a Tsunami: The Japanese Tsunami 11.3.11
watch the moments it hit the shore.
- Cause - you must include diagrams in your explanation
- Effects
- Response
- use this table to get you started on effects and responses
The most powerful earthquake recorded in Japanese history, magnitude 9.0. The tremors were the result of a violent uplift of the sea floor 80 miles off the coast of Sendai, where the Pacific tectonic plate slides beneath the Eurasian Plate. Tens of miles of crust ruptured along the trench where the tectonic plates meet. The earthquake occurred at the relatively shallow depth of 15 miles, meaning much of its energy was released at the seafloor
As the Pacific plate moves down, it sticks to the overhead plate and pulls it down too. Eventually, the join breaks, causing the seafloor to spring upwards several metres. The plate tectonics of the region are complex, and geologists are not sure which plate Japan sits on. Candidates include the Eurasian plate, the North American plate, the Okhotsk plate, and the Honshu microplate.
Follow this link to a BBC animation to find out what causes a tsunami
CH 4 Documentary on the Japanses Earthquake 2011
One year on - 2012 anniversary
The Asian Tsunami 2004 - cause, effects and responses. Overview of the countries affected. lots of short video clips you can select from here
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