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The point underground where the energy is released (causing the earthquake) is the focus point. This area is the actual origin of the earthquake. It should not be confused with the epicenter, which is the point above ground where the earthquake originates.
Epicenter
the focus
Focus or Hypocenter
Focus or Hypocenter
The Tectonic Plates.
Geothermal Energy
The focus of an earthquake is the point in the earth's interior where energy is release.
Volcanoes
Volcanoes
epicenter
Earths interior and the sun