Correct Option
The correct option is Epicentre.
Explanation
An earthquake involves the release of energy from a specific point within the Earth's lithosphere, generating seismic waves that travel outwards. The terminology used to describe the location of an earthquake distinguishes between its actual origin underground and the corresponding point on the surface.
Option Analysis:
- Hypocentre Hypocentre: Incorrect. The Hypocentre (also known as the Focus) is the point within the Earth where the energy is released and the rupture originates. It is the source of the seismic waves.
- Epicentre Epicentre: Correct. The Epicentre is the point on the Earth's surface located vertically above the Hypocentre (Focus). It is the first point on the surface to experience the seismic waves.
- Fault zone Fault zone: Incorrect. A fault zone refers to the area of fractures or discontinuities in a volume of rock across which there has been significant displacement. It is the physical structure where the slip occurs, not the specific surface point.
- Shadow zone Shadow zone: Incorrect. The shadow zone is a specific region on the Earth's surface (typically between 105° and 145° from the epicentre) where seismographs do not record P-waves or S-waves due to the refraction and non-propagation of waves through the Earth's core.
Key Takeaway: The Hypocentre (Focus) is the underground origin of the earthquake, whereas the Epicentre is the point on the surface vertically above it.