More than a hundred earthquakes occur each year. They can annihilate a city in just a few seconds. Tokyo, Istanbul, Los Angeles… Some of the biggest cities in the world are under threat. Fortunately, our understanding of earthquakes is becoming more and more accurate. Almost everywhere on the surface of the globe, a vast network of GPS trackers have been installed on mountains as on great plains. Researchers from all over the world are now focusing on one single objective: Anticipating the exact moment when the Earth will move.