Nikola Tesla Books

“Energy is the basis of creating electricity that we can utilize, so how can we harness the power of an earthquake? Obviously, today, if that much energy were being drawn from the Earth through the Great Pyramid, tourists would not be parading through it every day. In order for the system to work, the pyramid would need to be mechanically coupled with the Earth and vibrating in sympathy with it. To do this, the system would need to be "primed"—we would need to initiate oscillation of the pyramid before we could tap into the Earth's oscillations. After the initial priming pulse, though, the pyramid would be coupled with the Earth and could draw off its energy. In effect, the Great Pyramid would feed into the Earth a little energy and receive an enormous amount out of it in return.
How do we cause a mass of stone that weighs 5,273,834 tons to oscillate? It would seem an impossible task. Yet there was a man in recent history who claimed he could do just that! Nikola Tesla, a physicist and inventor with more than six hundred patents to his credit—one of them being the AC generator—created a device he called an "earthquake machine." By applying vibration at the resonant frequency of a building, he claimed he could shake the building apart. In fact, it is reported that he had to turn his machine off before the building he was testing it in came down around him.
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The New York World-Telegram reported Tesla's comments from a news briefing at the hotel New Yorker on July 11, 1935: 'I was experimenting with vibrations. I had one of my machines going and I wanted to see if I could get it in tune with the vibration of the building. I put it up notch after notch. There was a peculiar cracking sound. I asked my assistants where did the sound come from. They did not know. I put the machine up a few more notches. There was a louder cracking sound. I knew I was approaching the vibration of the steel building. I pushed the machine a little higher. Suddenly, all the heavy machinery in the place was flying around. I grabbed a hammer and broke the machine. The building would have been about our ears in another few minutes. Outside in the street there was pandemonium. The police and ambulances arrived. I told my assistants to say nothing. We told the police it must have been an earthquake. That's all they ever knew about it.”
― Christopher Dunn, The Giza Power Plant: Technologies of Ancient Egypt