Question

Define (i) focus, and (ii) epicentre, of an earthquake.

Answer 1

Answer:

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Explanation:

Origin of an earthquake

The focus of an earthquake is the point where the rocks start to fracture. It is the origin of the earthquake. The epicenter is the point on land directly above the focus. Focus of an Earthquake, USGS.

Answer 2

Focus and Epicenter

Explanation:

An earthquake is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. The focus is the place inside Earth's crust where an earthquake originates. The point on the Earth's surface directly above the focus is the epicenter. When energy is released at the focus, seismic waves travel outward from that point in all directions.