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Why do most deep earthquakes occur at convergent boundaries?

Answer:
Convergent boundaries are boundaries where tectonic plates are moving together. Since the edges of both can't be in the same place, one plate will be forced under another plate (and the other above).

The plate going 'down' will thus go deeper into the earth - allowing deeper earthquakes to occur.
First answer by ID1129747829. Last edit by Pdehn. Contributor trust: 8 [recommend contributor recommended]. Question popularity: 10 [recommend question].