Earthquake.jpeg
This earthquake was caused by subduction. Subduction is caused when one plate goes underneath the other, in this case an ocean under a continental. This creates a trench and a volcanic mountain range that formed Japan. Unfortunately there are also a lot of earthquakes and these faults. At this boundary there has been a significant history of major earthquakes. This has made Japan one of the most earthquake ready nations but they still couldn't hold up to this. This was a crushing blow and please donate to Japan.
http://www.platetectonics.com/book/images/Subduction2.gif
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