Question

Name the point in the earth plates from which the seismic energy originates during an earthquake event.

• A. Epicenter
• B. Focus
• C. Plate boundary
• D. Central Point

Hint:

Remember the difference: the \textbf{Focus} is the underground point of origin. The \textbf{Epicenter} is the point on the surface directly above the focus. The prefix 'epi-' means 'upon' or 'above'.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept
The question asks for the specific term for the point of origin of an earthquake \textit{within} the Earth's crust.

Step 2: Defining the Terms


(A) Epicenter: This is the point on the Earth's surface directly \textit{above} the point of origin. It is where the earthquake's effects are often most strongly felt.

(B) Focus: Also known as the hypocenter, this is the actual point \textit{within} the Earth where the fault rupture begins and the seismic energy is first released.

(C) Plate boundary: This is the region where tectonic plates meet. While most earthquakes occur along plate boundaries, it is a general area, not the specific point of origin.

(D) Central Point: This is not a standard seismological term.


Step 3: Final Answer
The point where the seismic energy originates is called the focus or hypocenter. Therefore, option (B) is the correct answer.