Discussion
A seismograph is
Answer: D
Correct answer: the instrument that records ground motion
The seismograph is the complete recording instrument - the seismometer that senses the motion together with the timing and recording system. The record it produces is the seismogram, the point at which rupture begins is the focus or hypocentre, and magnitude scales are quite separate constructs. The three words seismograph, seismometer and seismogram are frequently confused and are worth keeping distinct.
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