Discussion
Earthquakes with a focal depth less than about 70 km are classified as
Answer: C
Correct answer: shallow focus
The conventional divisions are shallow to about 70 km, intermediate from 70 to 300 km, and deep below 300 km. Shallow earthquakes matter disproportionately: the energy has less rock to travel through before it reaches the surface, so for a given magnitude a shallow event shakes the ground far more strongly than a deep one.
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