Build a seismograph with Raspberry Shake — The MagPi magazine
Structure- and Sampling-Adaptive Gait Balance Symmetry Estimation Using Footstep-Induced Structural Floor Vibrations | Journal of Engineering Mechanics | Vol 147, No 2
DIY Geophone | money | This is a very simple DIY project that will save you quite a bit of money. Using parts that you can easily get online for under $50,
INFILTEC: How to Build an Inexpensive Seismometer - make seismograph kit