Azimuth is the direction of a celestial object from the observer. The observer is usually located somewhere on the Earth's surface.
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the energy of an earthquake, called seismic waves,originates from a point called the ? epicenter
Seismic wave is mostly referred to earthquake impact ,so the word epicentre can be applied to its origin or point of impact.
The focus is the point in the earths crust where the earthquake originates and the epicentre is the point in the earths surface directly above the focus.
The term that describes the point on the Earth's surface above the area where an earthquake originates is it's epicenter.
Heart excitation originates in the sino-atrial node.