Word: caldera
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Dates: during 2010-2019
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...Yellowstone caldera was created by an enormous super-volcanic explosion 640,000 years ago. Ever since, the area has been the the site of earthquake activity. Indeed, a map of the historic seismicity of the region over the last 20 years shows swarms of dots much like so many busy bees...
...frequency and intensity Tuesday, experts who monitor the area say they did not warrant emergency measures. A little over one year ago, there was some concern over a series of quakes centered around the north shore of Yellowstone Lake, which overlays some of the ancient, yet still simmering, Yellowstone Caldera. (See why a spurt of quake activity raised fears in Yellowstone...
Rather than being triggered by lava-flow murmurings deep in the Yellowstone Caldera, the latest quakes are believed to be the result of shifting plate tectonics, according to a statement issued by the Yellowstone Volcano Observatory (YVO), which is operated by the University of Utah and the U.S. Geological Survey. "At this time the Yellowstone Volcano Observatory does not consider the swarm to be unusual and the earthquakes are likely related to tectonic fault sources," the statement said. "Also there is no indication of premonitory volcanic or hydrothermal activity, but ongoing analyses will evaluate these different sources...