The point on the Earth's surface directly above the earthquake's focus is called the:

The point on the Earth's surface directly above the earthquake's focus is called the:

• A. Focus
• B. Hypocenter
• C. Center
• D. Epicentre

Answer: (D)

The essential idea is the distinction between the location where the earthquake starts and the point on the ground above it. The earthquake begins underground at the focus (also called the hypocenter). The waves then travel outward, and the point on the Earth’s surface directly above that underground point is called the epicentre. This surface point is what we use on maps and reports to describe where the shaking is felt most strongly. The other terms don’t fit: the focus/hypocenter is the underground origin, not the surface point; a generic “center” isn’t a technical term for this feature. So the surface point directly above the focus is the epicentre.

The essential idea is the distinction between the location where the earthquake starts and the point on the ground above it. The earthquake begins underground at the focus (also called the hypocenter). The waves then travel outward, and the point on the Earth’s surface directly above that underground point is called the epicentre. This surface point is what we use on maps and reports to describe where the shaking is felt most strongly. The other terms don’t fit: the focus/hypocenter is the underground origin, not the surface point; a generic “center” isn’t a technical term for this feature. So the surface point directly above the focus is the epicentre.