Rumours of an imminent supervolcanic eruption have been greatly exaggerated.

A video posted to YouTube on March 20 showed a herd of bison running down a road in Yellowstone National Park, sparking fears among bloggers that the animals were fleeing seismic activity. Some speculated it could be connected to an eruption of a gargantuan volcano, Russian TV network RT reported.

The video was posted 10 days before the park was struck by a 4.8-magnitude earthquake, the biggest it had seen since 1980.

Park officials fielded dozens of calls since similar reports emerged of a possible eruption, but they're assuring people that the bison weren't fleeing an imminent disaster — they were just frisky, spokeswoman Amy Bartlett told Thomson Reuters.

"Contrary to online reports, it's a natural occurrence and not the end of the world," she said.

As it turns out, the bison in the video were actually running toward the volcano, park spokesman Dan Hottle told the Jackson Hole News and Guide.

The earthquake actually happened north of the boundary of the Yellowstone Supervolcano, whose mouth, or caldera, is 80 kilometres long and 50 kilometres wide. It happened in an area that's dominated by faults, not magmatic activity, Bob Smith, a geophysicist at the University of Utah, told the newspaper.

The last time that the Yellowstone Supervolcano blew its top was 640,000 years ago, exploding with a force that was 1,000 times larger than the eruption of Mount St. Helens in 1980.

Scientists discovered last year that the volcano's molten rock is two and a half times larger than previously thought, meaning it has the potential to create an eruption that's 2,000 times larger than the 1980 event. National Geographic dubbed it a huge underground "magma pocket".

There are conflicting reports on how much damage an eruption might cause. Jamie Farrell, lead author of the study that uncovered the size of the supervolcano's molten rock, said an eruption would be a "global event" with a lot of destruction and impacts around the world.

But USGS geologist Jake Lowenstern told io9 a different story in May 2013.

He said that while supervolcanoes can have large eruptions, lava flows would likely be concentrated within the park, though airborne ash could create a fine dusting as far away as New York.

Lowenstern added that it's unlikely such an eruption will happen anytime soon, in part because the caldera has had several regular eruptions that release pressure.

"A more likely eruption is going to be a lava flow, a small event," he said.

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  • A resident clears volcanic ash on the road of Kediri in East Java province following the eruption of Mount Kelud volcano on February 14, 2014. (JUNI KRISWANTO/AFP/Getty Images)

  • Indonesian airport personnel inspect volcanic ash covered planes and the airport of Yogyakarta about 200 kilometers (124 miles) west of the Mount Kelud volcano in East Java province following its eruption on February 14, 2014. (NINOY/AFP/Getty Images)

  • Indonesian police distribute face masks to residents on the streets of Malang, East Java province, on February 14, 2014 as volcanic ash covered the city following an eruption by Mount Kelud, considered one of the most dangerous volcanoes on densely populated Java. (AMAN ROCHMAN/AFP/Getty Images)

  • An Indonesian military soldier carries a collapse resident during the evacuation in Malang, East Java province, on February 14, 2014 moment after Mount Kelud erupted. (AMAN ROCHMAN/AFP/Getty Images)

  • Volcanic ash blankets Yogyakarta in Central Java about 200 kilometers (124 miles) west of the Mount Kelud volcano in East Java province on February 14, 2014. (SURYO WIBOWO/AFP/Getty Images)

  • Indonesian soldiers evacuate ash covered residents in Malang, East Java province on February 14, 2014 moments after Mount Kelud, considered one of the most dangerous volcanoes on densely populated Java, erupted. (AMAN ROCHMAN/AFP/Getty Images)

  • Indonesian soldiers wrap stupas of the ancient Borubudur temple in Central Java province to protect from the rain of volcanic ash from Mount Kelud volcano on February 14, 2014. (SURYO WIBOWO/AFP/Getty Images)

  • Residents clean ash covered roofs in the village of Kediri in East Java province on February 14, 2014 following the eruption of Mount Kelud volcano. (JUNI KRISWANTO/AFP/Getty Images)

  • A becak driver wearing a full helmet passes over ash covered ground of the Sultan's palace in Solo in Central Java about 150 kilometers (93 miles) west of Mount Kelud volcano on February 14, 2014. (AFP/AFP/Getty Images)

  • Volcanic clouds rise from the eruption of Mount Kelud volcano as seen from Kediri town in East Java province on February 14, 2014. (JUNI KRISWANTO/AFP/Getty Images)

  • Indonesian airport personnel inspect volcanic ash covered planes and the airport of Yogyakarta about 200 kilometers (124 miles) west of the Mount Kelud volcano in East Java province following its eruption on February 14, 2014. (NINOY/AFP/Getty Images)

  • Residents walk to an evacuation center along the ash covered road of Kediri in East Java province following the eruption of Mount Kelud volcano on February 14, 2014. (JUNI KRISWANTO/AFP/Getty Images)