They do not understand the science of sympathetic vibration. I call it reverb earth science. Anyway as a stone is tossed into a lake it ripples. As the ripples hit floating debris, the debris generate counter ripples. These inturn generate counter-counter ripples.
Some ripples negate each other.
Others amplify each other. Like magnetic waves. This is what I believe applies whole heartedly to quakes. After all a vibration is a vibration is everything. Everything is vibration.