Discussion
The Alpine-Himalayan orogenic belt characterizes the focal depths for :
Answer: B
The key's answer is shallow earthquakes (less than 100 km).
The Alpine-Himalayan belt is a zone of continental collision. Continental crust is too buoyant to sink deep into the mantle, so there is no long, deep slab of the kind that produces deep earthquakes. Most earthquakes along the belt, including the great Himalayan thrust earthquakes, occur within the crust and upper lithosphere at shallow depths.
Deep earthquakes of 400 to 700 km occur only along subducting oceanic slabs, as in the western Pacific. Intermediate-depth earthquakes occur locally (as beneath the Hindu Kush) but do not characterise the belt, and a limit of 5 km is far too shallow for its seismicity.
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