Point of Origin of Earthake Wave is known as

The point of origin of an earthquake wave within the Earth's interior is known as the focus or hypocentre [4]. This is the specific location where energy is released due to the sudden displacement of the Earth's crust or fault slipping [1]. From this center of disturbance, seismic waves radiate outward in all directions [1]. In contrast, the epicenter is the point on the Earth's surface directly vertical to the focus [2]. While the focus is underground—often occurring at depths less than 60 km in the lithosphere—the epicenter is the first point on the surface to experience the seismic waves [4]. The term photosphere refers to a layer of the Sun, and a seismic zone is a broad geographic region prone to earthquakes, making 'Focus' the precise term for the point of origin [2].

Sources

1. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 17: Contemporary Issues > Earthquakes > p. 8
2. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 14: Earthquakes > Focus and Epicentre > p. 177
3. [4] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 8: Natural Hazards and Disaster Management > earthquake Disasters > p. 15