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Seismic regulators were being installed in a subterranean cavern under the city of San Francisco on Earth in late 2368 when a work crew discovered the severed head of Data, which had been buried there for five centuries. (TNG: "Time's Arrow")
Risa was equipped with seismic regulators to stop any earthquakes from occurring. In 2373, Pascal Fullerton cited the regulators as being an example of the illusion that was Risa. (DS9: "Let He Who Is Without Sin...")