By Yellowstone: Expert says earthquake activity is ‘significant’ The caldera inside Yellowstone National Park gets its nickname as a supervolcano due to its capability to inflict global devastation. It was formed during the last three big events over the past 2.1 million years and is constantly monitored by the USGS (United States Geological Survey) for...
Yellowstone: ‘Greatest hazard' warning after huge 7.3 magnitude earthquake rocked park
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