GEOLOGY

Detailed explanation-1: -The earthquakes originate in tectonic plate boundary. The focus is point inside the earth where the earthquake started, sometimes called the hypocenter, and the point on the surface of the earth directly above the focus is called the epicenter.

Detailed explanation-2: -The spot underground where the rock first breaks is called the focus, or hypocenter of the earthquake. The place right above the focus (at the ground surface) is called the epicenter of the earthquake. Cutaway view of the reverse fault. The earthquake starts at the focus, with slip continuing along the fault.

Detailed explanation-3: -The point on a fault at which the first movement or break occurs during an earthquake is called the earthquakes hypocenter (focus) (figure 1). In the case of a large earthquake, a section of a fault that is many kilometers long may slip, but there is always a point at which the first movement occurred.

Detailed explanation-4: -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.

Detailed explanation-5: -The point at the surface directly above the focus is called the earthquake epicentre. Intense vibrations, or seismic waves, spread out from the initial point of rupture (the focus) like ripples on a pond. These waves are what makes the ground shake and can travel large distances in all directions.