Newsweek - An ongoing earthquake swarm at Yellowstone volcano is now one of the biggest ever recorded, with over 2,300 tremors since it began in June.As of August 30, 2,357 earthquakes had been recorded. The most powerful in recent weeks was magnitude 3.3; it took place on August 21.
... Jamie Farrell, a research professor at the University of Utah, which is involved in monitoring seismic activity at Yellowstone, told Newsweek that the swarm was “nothing out of the ordinary” and that it had “slowed down significantly but does occasionally have little bursts of activity that lasts for a few hours.”
Still, the ongoing swarm is now one of the longest and largest on record. The largest swarm ever recorded was in October 1985; it lasted for three months and included more than 3,000 earthquakes. There was another large swarm in 2010, when more than 2,000 events were recorded over a month.
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