Is the epicenter always directly above the hypocenter? All the graphics I've seen showing epicenters with a hypocenter (labeled focus in the graph below) appear to show that epicenters are always directly above their related hypocenters. Is this correct?
By definition, the answer is yes:


  epicenter, the point on the earth's surface vertically above the focus of an earthquake, or the Hypocenter


according to Merriam-Webster or a many other sources.