Discussion
Deep focus earthquakes occur almost exclusively along
Answer: A
Correct answer: subduction zones
Below about 70 km rock is normally too hot and too confined to fail brittly, so deep earthquakes should not happen at all. They occur only where a cold slab of oceanic lithosphere is being carried down into the mantle, keeping brittle conditions to depths of several hundred kilometres. The distribution of deep foci therefore maps the descending slab, and was among the first strong evidence for subduction.
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