The Yellowstone Volcano Observatory has reported a spontaneous eruption on the Mount St. Helens volcano in Wyoming, where the eruption occurred at 6:07 p.m.
The eruption is the second in less than three weeks on the volcano and is being closely monitored by U.S. Geological Survey officials.
The Yellowstone Observatory, a joint project of the U. of Wyoming and National Park Service, said the volcano erupted at 6,900 feet (2,843 meters).
The eruption was caused by a large rock fall in a nearby crater, the Observatory said.
The volcano is not currently active.
The Mount St-Helens Observatory says the eruption was “the largest in Yellowstone’s history” and the volcano’s “largest in recorded history.”
The eruption of Mount St.-Helens was not immediately known.
“The eruption is not expected to cause damage to the Yellowstone system,” said Yellowstone Volcano spokesman Michael Gagnon.
“We have been monitoring the situation and the Mounts-St. Heles Volcano Observatory is closely monitoring this eruption.”
In an earlier statement, the Yellowstone Volcano said that there was no direct cause for the eruption, but that it was possible that a combination of “weather and magma activity” could be to blame.
In an update on Sunday, the Mountst.
Helenes Observatory said the eruption happened in the vicinity of the volcano, and that it has been under observation since Tuesday.
A fire at the volcano is under control, and Mount St., Helens, is currently showing signs of improvement.
A recent eruption of the Mount Wachusett volcano in Oregon in December, which was the most active on record, was also blamed on a “combination of magma and geothermal activity.”
The Mountst.-Heles eruption is expected to last at least a few days, Gagnons said.