There’s a Chicago-sized bulge in Yellowstone National Park, and it’s still rising.

The Greater Yellowstone Ecosystem remains one of the most dynamic places on the planet. This is largely due to the ongoing volcanic, geothermal, and hydrothermal activity that keeps the park’s geysers erupting and hot springs bubbling.

Mike Poland, scientist-in-charge of the Yellowstone Volcano Observatory, and other scientists are monitoring an area of ongoing uplift on the northern rim of the Yellowstone Caldera, near Gibbon Falls.

The ground across a massive swath of the park has risen an inch since July.

“It’s an area over 19 miles across, give or take a few miles,” he said. “Saying the uplift is the size of Chicago makes it sound incredibly grandiose, but I think it’s pretty stunning even if it’s not particularly unusual.”

Is this underground bulge a sign that the supervolcano slumbering in northwest Wyoming is going to blow its top soon? Poland had a definitive answer.

“That doesn't mean that the volcano is about to erupt,” he said. “It’s Yellowstone being Yellowstone.”

(http://www.autoadmit.com/thread.php?thread_id=5826799&forum_id=2Reputation#49619761)