Building a seismograph

[andrewblog]

Mounths ago I built an earthquake detector that works by an high sensitive pendulum. Not a seismograph, simply a sound alarm which feels the small shaking of the primary wave. But we could make it a seismograph, if we have some basic experience with electromagnetic induction and related circuits.
Some days ago I found an interesting video:

http://www.youtube.com/watch?v=WHuWh1HXbtE

[bigboypants]

That is so cool. Where did you learn all that stuff? They don't teach those in our school. Lame.
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[machine]

You could even use an old joystick or Xbox controller joystick to monitor earth movements.

By removing the 2 axis joystick and suspending it by its handle from a thin, long cord you should be able to detect movement of the joystick unit. Write some VB or Java code to accept the outputs and display it.

Put a mass on it so it won't move much with air and this will help to filter out HF stuff.

Filter out any regular movements like from passing trucks (high frequency) and look for anything low frequency like below 3 Hz. Software can filter out anything not of interest.