Key Words: GEOLOGY UNIT 1.2


Focus - the point within the Earth at which the earthquake originates

Epicentre - the point directly above the focus on the Earth's surface

Isoseismal line - a line on a map that joins up points of equal intensity, seperating zones of different intensities

Intensity - a measure of the surface damage caused by an earthquake

Mercalli scale - measures the intensity of an earthquake and based on the


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