Amplitude 09
Amplitude 09 : The size of the wiggles on an earthquake recording; more general and correct in a physical sense the height of a wave-like disturbance - such as the seismic record trace (called waveform) - from the medium (zero) level to its peak, respectively trough. When measured from peak to trough it is called double or "peak-to-peak" (more correct "peak-to-trough") amplitude. In seismology ground motion amplitues are usually measured in nanometers (10-9 m) or micrometers (10-6 m)
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