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It’s shaking so much, it could be renamed Jellystone. Since 12 June, .

The earthquake “swarm” is occurring in the Hebgen Lake area. In 1959, a major quake in this region killed 28 people. But geologists monitoring the activity don’t think another big one is on the cards.

“Usually, you don’t get swarms before a big quake like that, and it’s too soon after the 1959 quake for enough strain to build up for a repeat,” says of the US Geological Survey in California, who heads the Yellowstone Volcano Observatory. “You’d be looking at the order of 200 years or so for enough strain to accumulate.”

“This is a large swarm but it is not the largest swarm we’ve recorded in Yellowstone,” says at the University of Utah in Salt Lake City. “Earthquake swarms are fairly common in Yellowstone.”

What’s more, the chances of significant activity associated with the Yellowstone supervolcano are slim, says Farrell. “There is no indication that this swarm is related to magma moving through the shallow crust,” he says. “The bottom line is that visitors should definitely not be worried about an impending volcanic eruption of the Yellowstone volcanic system.”

Lowenstern says the swarm is still active at a low level. “It could go on for another month.”