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Most earthquake detectors use a heavy weight attached to a coil moving inside a magnetic field. Earth movement will cause the ground and attached magnet to move. The suspended weight and coil tend to stay stationary and hence a signal is generated. Elaborate electronic filters and damping needs to be employed to get a meaningful signal.
My project avoids some of these problems by the use of ready made detectors with a low impedance and their own built in damping. 
http://www.mediafire.com/?yzmummj3yvow2zz
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