It is the Epicenter
This is known as the focus or more correctly the hypocentre.
The ENDPOINT
The origin.
It depends on what the name of the initial point is because that defines the direction of the ray. If the initial point is c, then the ray must be called cd, but if the initial point is d, then the ray must be called dc.
The epicenter is the point on the earth's surface directly above the earthquake's origin.
The big band theory
The big band theory
This is known as the focus or hypocentre.
It is "The Big Bang Theory."
Cameron donohue
Seismology.
Tremor.