Define epicentre, of an earthquake

Explanation

**Step-by-Step Solution:**

1. **Understanding Earthquakes**: An earthquake occurs when there is a sudden release of energy in the Earth's crust, often due to the movement of tectonic plates. This release of energy creates seismic waves.

2. **Identifying the Focus**: The point within the Earth where the earthquake originates is called the "focus" or "hypocenter." This is the exact location where the seismic rupture occurs.

3. **Determining the Epicenter**: The epicenter is defined as the point on the Earth's surface that is directly above the focus. It is the location on the surface that is closest to the seismic activity occurring below.

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