How a seismograph works
http://www.wwnorton.com/earth/egeo/flash/8_3.swf

Stephen Marshak, W.W. Norton


Find a Flash animation first showing the arrival of seismic waves to a seismograph. Except for the immobile seismograph mass (heavy weight with pen) which does not move due to inertia, everything else shakes This includes the horizontal rotating drum upon which seismic waves will be recorded. The animation can be paused and rewound to show the arrival sequence of P, S, and surface waves.

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This resource is referenced here:Keywords: seismograph, earthquakes, visualizations