Focus

Real World Example

Imagine you're trying to untangle a set of earphones that have been knotted up in your pocket. Just like the tangled mess of wires, an earthquake begins at a specific point deep underground where stress and tension have built up over time. This underground point, known as the "focus," is akin to the initial knot in your earphones that triggers the whole mess; it's where the earthquake's energy is first released, setting off the shaking and movement that affects everything around it.