A study shows that the magma chamber is about 2.5 times bigger than earlier estimates suggested.
A team found that the cavern stretched for more than 55 miles and contained 200-600 cubic km of molten rock, the BBC reported.
Prof Bob Smith, from the University of Utah, said that they'd been working there for a long time, and they always thought that it was be bigger but the finding was astounding.
Researchers used a network of seismometers situated around the park to map the magma chamber.
--ANI (Posted on 13-12-2013)