Focus: The geographical point on the earths surface vertically above the originating source.
Epicentre: The originating source of the seismic wavesinside the earth
Centre of mass: The point corresponding to the centre of gravity of a structural system
Centre of Stiffness: the point through which the resultant forces of a structural system act
http://www.iitk.ac.in/nicee/IITK-GSDMA/EBB_001_30May2013.pdf
Epicentre: The originating source of the seismic wavesinside the earth
Centre of mass: The point corresponding to the centre of gravity of a structural system
Centre of Stiffness: the point through which the resultant forces of a structural system act
http://www.iitk.ac.in/nicee/IITK-GSDMA/EBB_001_30May2013.pdf
A correction "The Hypocenter i.e. Focus is the originating source of the seismic waves inside the earth whereas the Epicentre is the geographical point on the earths surface vertically above the Focus."
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