“The investigation adds to anecdotal evidence that human activities, ranging from exploration for shale gas, quarrying and even water reservoirs, can cause quakes. ‘Our results imply that anthropogenic [man-made] activites could influence how and when earthquakes occur,’ said the study. In a commentary, Jean-Philippe Avouac, a geologist at the California Institute of Technology (Caltech) said water extraction at Lorca probably accelerated a natural process of stress accumulation rather than unleashed the earthquake by itself.”
