What term describes the point within Earth where an earthquake originates?

What term describes the point within Earth where an earthquake originates?

• A. Epicenter
• B. Hypocenter
• C. Focus
• D. Seismon

Answer: (C)

The starting point of an earthquake is the focus. This is the location inside Earth where the rocks rupture and energy begins to release, sending seismic waves outward. The epicenter is simply the point on the surface directly above the focus, where the shaking is often felt most strongly. Some sources also use hypocenter to mean the same interior origin, but in many introductory contexts the term used for the interior origin is focus. The other option, a nonstandard term like Seismon, isn’t used in this context.

The starting point of an earthquake is the focus. This is the location inside Earth where the rocks rupture and energy begins to release, sending seismic waves outward. The epicenter is simply the point on the surface directly above the focus, where the shaking is often felt most strongly. Some sources also use hypocenter to mean the same interior origin, but in many introductory contexts the term used for the interior origin is focus. The other option, a nonstandard term like Seismon, isn’t used in this context.