Discussion
Deep focus (~ 700 km) earthquakes are common in :
Answer: B
Deep-focus earthquakes are common in island arcs.
Island arcs, such as Japan, the Marianas, Tonga and Indonesia, lie above subduction zones where cold oceanic lithosphere sinks into the mantle. Earthquakes occur within the sinking slab along the inclined Wadati-Benioff zone, from shallow depths near the trench to about 700 km far behind it.
Mid-oceanic ridges and continental rifts are zones of extension with only shallow earthquakes, and the Himalayan belt is a continental collision zone whose earthquakes are mostly shallow.
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