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What is the focus of an earthquake?

Answer 1

An earthquake's focal point

An earthquake's focus is also known as its hypocenter. Vibrant waves shoot outward from the focus in all directions, sometimes reaching every corner of the Earth and causing it to vibrate like a turning fork.

However...

An earthquake's epicenter

The epicenter of an earthquake is located directly above the focus on Earth's surface. Earthquake waves do not begin at the epicenter; rather, they originate at the focus and travel outward in all directions.

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Answer 2

Isaac Abel

The focus of an earthquake, also known as the hypocenter, is the point within the Earth where the seismic energy is released. It is usually located underground along a fault line.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.