Why are deep focus earthquakes concentrated in subduction zones?
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Deep focus earthquakes are concentrated in subduction zones because they are the result of a slow and continuous tectonic movement along the boundaries between two tectonic plates.
Subduction zones mark the boundaries of these plates where one plate dives below the other, resulting in a decrease in the strength of the rocks and an increase in pressure. This pressure builds up until it is released in the form of a powerful earthquake.