(i) Seismic focus - This is the spot in the earth's crust where the earthquake originates.
(ii) Epicentre - This is the point on the earth's surface vertically above the focus.
(iii) Seismograph - Also known as seismometer, seismograph refers to a delicate scientific instrument used to detect and record an earthquake thousands of kilometers away.
gideon1 answered the question on September 29, 2017 at 18:35
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