What is the difference between a focus and an epicenter How does the intensity of an earthquake change with increasing focus depth?

The focus of an earthquake is the point within the Earth where the earthquake originates, while the epicenter is the location on the Earth's surface directly above the focus. As the depth of the focus increases, the intensity of the earthquake's shaking at the surface typically decreases, primarily due to the greater distance the seismic waves must travel. Additionally, deeper foci can result in less surface damage, as the energy disperses over a larger area.