Amplification 2
Amplification 2 : Natural Disaster. Most earthquakes are relatively small, in fact, so small that no one feels them. In order for seismologists to see the recording of the ground movement from smaller earthquakes, the recording has to be made larger. It's like looking at the recording through a magnifying glass, and the amount that it is magnified is the amplification. Modern seismographs are able to magnify the ground motion 10 times or even more, i.e., they are able to resolve ground motion amplitudes as small as the diameter of molecules or even atoms. Shaking levels at a site may also be increased (or decreased) by focusing (or defocusing) of seismic energy caused by the geometry and the velocity structure of sediments, such as basin subsurface topography, or by surface topography. Both the amplification of seismographs and of the subsoil structure is usually dependent on the frequency of the seismic signal
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