"For more than two decades, an area larger than Chicago centered near the basin has been inflating and deflating by several inches in erratic bursts. In a hyperactive volcanic region like Yellowstone, the exact causes of any specific movement are difficult to pin down."

[...]

"To be clear, the new research does not indicate that the supervolcano that created Yellowstone’s caldera—which last erupted 640,000 years ago—is any more likely to erupt now."