Documented strange behaviors of animals before an earthquake could invite us to believe that some of them anticipate tectonic activity. We also know that human complex organization makes it difficult for all of us to get in touch with our deepest instinct.
Is it possible that this hypothetical natural ability to anticipate earthquakes still remains as some instinctive input in our daily behavior?
If yes, and to try to measure how much global human activity could reflect some anticipation, I think we could with modern technologies, monitor all our connected device hmi's (Mouse, touchpad, keyboard, phone, voice spectral data's) (anonymously of course) and study delta's on long periods.
I also want to point a risk: Is it not dangerous to do so if those anticipations are among the strongest booster of human intellect and progress in general? (Pandora box problem)
But maybe, those hypothetical intuitions are source of evil momentum...