GEOLOGY

Detailed explanation-1: -The point where an earthquake starts is termed the focus or hypocentre and may be many kilometres deep within the earth. The point at the surface directly above the focus is called the earthquake epicentre.

Detailed explanation-2: -When an earthquake occurs, the elastic energy is released and sends out vibrations that travel in all directions throughout the Earth. These vibrations are called seismic waves.

Detailed explanation-3: -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-4: -The kinetic energy (energy of motion) of the disturbance radiates in all directions away from the focus in the form of waves. Thus the leading edge of the wave, or wavefront, expands upward, laterally and downward.

Detailed explanation-5: -Answer: When an earthquake occurs, the elastic energy is released and sends out vibrations that travel in all directions throughout the Earth. These vibrations are called seismic waves. The point within the earth where the fault rupture starts is called the focus or hypocenter.