The earthquake rocked the national park in Wyoming on Wednesday, with people reporting "rumbling". Taking to Twitter, one said: "Thought I felt a rumbling so I went on http://earthquake.usgs.gov.... no earthquake here but uh... seems like Yellowstone is a bit active... and has been for the last few weeks is that normal?"
Another commented: "I thought I felt a rumbling as well."
Yellowstone is one of the world's largest active volcanic systems.
Three huge eruptions of the supervolcano have happened in the last 3 million years.
The blasts went off some 640,000, 1.3 million and 2.1 million years ago.Insurance Loans Mortgage Attorney Credit Lawyer
An earthquake with a magnitude of 3.2 has struck Yellowstone National Park (Image: USGS/GETTY)
The next eruption is feared to have catastophic worldwide effects.
The US Geological Survey (USGS) has said Yellowstone is not overdue for a large eruption.
It said volcanoes do not work in predictable ways and even if they did, there would still be another 100,000 years until a blast is due.
While another big eruption is possible, it may never happen, according to the USGS.
READ MORE: 'Greatest hazard' warning after earthquake hit Yellowstone
In December, the volcano was rocked by a total of