Improve Tesla's earthquake machine with accelerometers which measure the response of the shaking building to provide feedback to the driver to shake it at the right frequency. In particular, as the building begins to shake, its resonant frequency probably changes due to nonlinear response of the materials, so automatically adjust accordingly.
Figuring out how to drive it based on the acceleration and unknown response function is an interesting control problem.
Continue to use the Mythbusters electromagnetic linear motor.
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