“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.”

http://www.rawstory.com/rs/2012/10/21/scientists-confirm-water-extraction-helped-trigger-deadly-2011-quake-in-spain/

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